loadmodule "luaiup"
loadmodule "luahandle"
loadmodule "lualibs"

--[[
load "indent.lua"

function testIndenter(i)
   local lib = IndentationLib
   local str = ""
   local inp = Input "dalos.lua"
   str = inp:readfile()

   local colorTable = lib.defaultColorTable
   print(lib.indentCode(str, 4, colorTable, i))
end

testIndenter()
]]--

load "iupe-dbuffer.lua"
load "iupe-tview.lua"

if not dalosp then dalosp = {} end
if not dalos then dalos = {} end
dalos.objectstypes = {}
dalos.objectstypes_by_name = {}

dalosp.NORTH = 1
dalosp.SOUTH = 2
dalosp.WEST = 3
dalosp.EAST = 4
dalosp.cross = { }

dalos.version = { MAJOR = 0, MINOR = 1, suffix = "alpha" }
dalos.version.string = dalos.version.MAJOR .. "." .. dalos.version.MINOR .. dalos.version.suffix

function dalos:register_obj(name, constructor, category, registertemplate)
    if self.objectstypes_by_name[name] then
        error("An object type of that name already exists: " .. name)
    end
    table.insert(self.objectstypes, { name = name, constructor = constructor, counter = 1, category = category, registertemplate = registertemplate })
    self.objectstypes_by_name[name] = #self.objectstypes
    if self.active_menu then
        self.active_menu:update_objects()
    end
end

function dalos:clean()
    local d = dalos.active_canvas
    for k, v in ipairs(d.objects) do
        for ind = 1, v.obj.noutputs do
            d:destroylink(v, ind)
        end
    end
    
    while #d.objects ~= 0 do table.remove(d.objects) end
    d.objects = {}
end

dalosp.canvas = {
    DARK_WHITE = cd.EncodeColor(224, 224, 224),
    BEZIER_CTRL_LEN = 40,
    
    drawlink = function (self, src, dst, si, di)
        local cv = self.cvdb
        local iy = function (y) return cv:InvertYAxis(y) end
        local ctrl_len = dalosp.canvas.BEZIER_CTRL_LEN
        
        cv:Foreground(cd.BLACK)
        local x1, y1, x2, y2
        
        x1 = self.origin.x + src.x + src.w
        x2 = self.origin.x + dst.x
        y1 = self.origin.y + src.y + si * src.h / (src.obj.noutputs + 1)
        y2 = self.origin.y + dst.y + di * src.h / (dst.obj.ninputs + 1)
        x1, x2, y1, y2 = math.floor(x1 + 0.5), math.floor(x2 + 0.5), math.floor(y1 + 0.5), math.floor(y2 + 0.5)
        cv:Begin(cd.BEZIER)
        cv:Vertex(x1, iy(y1))
        cv:Vertex(x1 + ctrl_len, iy(y1))
        cv:Vertex(x2 - ctrl_len, iy(y2))
        cv:Vertex(x2, iy(y2))
        cv:End()
    end,
    
    XMENUWIDTH = 100,
    
    drawxmenu = function (self, x, y)
        local cv = self.cvdb
        local width = dalosp.canvas.XMENUWIDTH
        local x1, x2, y1, y2 = x - width / 2, x + width / 2, y - width / 2, y + width / 2
        x1, x2, y1, y2 = math.floor(x1 + 0.5), math.floor(x2 + 0.5), math.floor(y1 + 0.5), math.floor(y2 + 0.5)
        local iy = function (y) return cv:InvertYAxis(y) end
        local cx1, cx2, cy1, cy2 = x - 5, x + 5, y - 5, y + 5
        
        cv:Foreground(dalosp.canvas.DARK_WHITE)
        cv:Box(x1, x2, iy(y2), iy(y1))
        cv:Foreground(cd.GRAY)
        cv:Line(x1, iy(y1), x2, iy(y2))
        cv:Line(x1, iy(y2), x2, iy(y1))
        cv:Line(x1 + 1, iy(y1), x2, iy(y2 - 1))
        cv:Line(x1, iy(y2 - 1), x2 - 1, iy(y1))
        cv:Foreground(cd.WHITE)
        cv:Line(x1, iy(y1 + 1), x2 - 1, iy(y2))
        cv:Line(x1 + 1, iy(y2), x2, iy(y1 + 1))
        cv:Line(x1, iy(y1 + 2), x2 - 2, iy(y2))
        cv:Line(x1 + 2, iy(y2), x2, iy(y1 + 2))
        cv:Foreground(dalosp.canvas.DARK_WHITE)
        cv:Sector(x, iy(y), 10, 10, 0, 360)
        cv:Foreground(cd.GRAY)
        cv:Arc(x, iy(y), 10, 10, 0, 360)
        cv:Foreground(cd.WHITE)
        cv:Arc(x + 1, iy(y + 1), 10, 10, 0, 360)
        cv:Foreground(cd.GRAY)
        cv:Line(x1, iy(y2), x2, iy(y2))
        cv:Line(x1 + 1, iy(y2 - 1), x2 - 1, iy(y2 - 1))
        cv:Line(x1 + 2, iy(y2 - 2), x2 - 2, iy(y2 - 2))
        cv:Line(x2, iy(y1), x2, iy(y2))
        cv:Line(x2 - 1, iy(y1 + 1), x2 - 1, iy(y2 - 1))
        cv:Line(x2 - 2, iy(y1 + 2), x2 - 2, iy(y2 - 2))
        cv:Foreground(cd.WHITE)
        cv:Line(x1, iy(y1), x1, iy(y2))
        cv:Line(x1 + 1, iy(y1 + 1), x1 + 1, iy(y2 - 1))
        cv:Line(x1 + 2, iy(y1 + 2), x1 + 2, iy(y2 - 2))
        cv:Line(x1, iy(y1), x2, iy(y1))
        cv:Line(x1 + 1, iy(y1 + 1), x2 - 1, iy(y1 + 1))
        cv:Line(x1 + 2, iy(y1 + 2), x2 - 2, iy(y1 + 2))
        
        local f, st, si = cv:GetFont()
        cv:Font("Helvetica", cd.PLAIN, 10)
        
        cv:Foreground(cd.BLACK)
        cv:TextOrientation(0)
        if dalosp.cross.north then
            cv:TextAlignment(cd.NORTH)
            cv:Text(x, iy(y1 + 3), dalosp.cross.north.name)
        end
        cv:TextAlignment(cd.SOUTH)
        if dalosp.cross.south then
            cv:Text(x, iy(y2 - 3), dalosp.cross.south.name)
        end
        if dalosp.cross.west then
            cv:TextOrientation(270)
            cv:Text(x1 + 3, iy(y), dalosp.cross.west.name)
        end
        if dalosp.cross.east then
            cv:TextOrientation(90)
            cv:Text(x2 - 3, iy(y), dalosp.cross.east.name)
        end

        cv:Font(f, st, si)
    end,
    
    draw = function (self)
        local cvdb = self.cvdb
        if not cvdb then return iup.DEFAULT end
        cvdb:Background(dalosp.canvas.DARK_WHITE)
        cvdb:Clear()
        
        for k, v in ipairs(self.objects) do
            v.obj:draw(cvdb, self.origin.x + v.x, self.origin.y + v.y, v.w, v.h)
            for oi = 1, v.obj.noutputs do
                local dest = v.obj.outputs[oi]
                if dest and dest.obj then
                    self:drawlink(v, dest.obj, oi, dest.ind)
                end
            end
        end
        
        if self.stateful.linking then
            cvdb:Foreground(cd.BLACK)
            cvdb:Line(self.bx, cvdb:InvertYAxis(self.by), self.ox, cvdb:InvertYAxis(self.oy))
        end
        
        if self.menu.x then self:drawxmenu(self.menu.x, self.menu.y) end
        
        cvdb:Flush()
        
        return iup.DEFAULT
    end,
    
    addobj = function (self, obj, x, y, w, h)
        table.insert(self.objects, { obj = obj, x = x, y = y, w = w, h = h })
        self:draw()
    end,
    
    delobj = function (self, ind)
        local obj = self.objects[ind]
        for i = 1, obj.obj.noutputs do
            self:destroylink(obj, i)
        end
        for i = 1, obj.obj.ninputs do
            self:destroylink_dst(obj, i)
        end
        table.remove(self.objects, ind)
        self:draw()
    end,
    
    findobj = function (self, x, y)
        local obj, ind
        
        x = x - self.origin.x
        y = y - self.origin.y
        
        for k, v in ipairs(self.objects) do
            if v.x <= x and (v.x + v.w) >= x and v.y <= y and (v.y + v.h) >= y then
                obj, ind = v, k
            end
        end
        
        return obj, ind
    end,
    
    moveobj = function (self, obj, dx, dy)
        obj.x, obj.y = obj.x + dx, obj.y + dy
        self:draw()
    end,
    
    setobjplace = function (self, obj, x, y)
        obj.x, obj.y = x, y
        self:draw()
    end,
    
    panning = function (self, dx, dy)
        self.origin.x = self.origin.x + dx
        self.origin.y = self.origin.y + dy
        self:draw()
    end,
    
    focus_cb = function (self, focus)
        if focus == 0 and (self.stateful.rghtbutton or self.stateful.leftbutton) then self:button_cb() end
    end,
    
    stypes = {
        INFO = 0,
        WARNING = 1,
        ERROR = 2,
    },
    
    setstatus = function (self, stype, msg)
        local s = dalos.active_status
        if not s then return end
        if stype == dalos.stypes.INFO then
            s.square.bgcolor = "0 255 0"
        elseif stype == dalos.stypes.WARNING then
            s.square.bgcolor = "255 255 0"
        elseif stype == dalos.stypes.ERROR then
            s.square.bgcolor = "255 0 0"
        end
        s.label.title = msg
    end,
    
    motion_cb = function (self, x, y, status)
        self.stateful.mousepos = { x = x, y = y }
        if self.stateful.panning then
            local ox, oy = self.ox, self.oy
            local dx, dy = x - ox, y - oy
            if self.stateful.linking then
                self.bx, self.by = self.bx + dx, self.by + dy
            end
            self:panning(dx, dy)
            self.ox, self.oy = x, y
        elseif self.stateful.leftbutton then
            local linking = self.stateful.linking
            self.stateful.dragging = true
            local got_error = false
            if self.stateful.leftclk and not self.stateful.linking then
                linking = self.stateful.leftclk
                if linking.obj.noutputs >= 1 then
                    self.stateful.linking = linking
                else
                    self:setstatus(dalos.stypes.ERROR, "Can't link: origin object doesn't have any output")
                    self.stateful.leftclk = nil
                    linking = nil
                    got_error = true
                end
            else
                linking = self.stateful.linking
            end
            if linking then
                self.ox, self.oy = x, y
                self:draw()
            elseif not got_error then
                -- todo: start selection square ?
            end
        elseif self.stateful.rghtbutton then
            if self.stateful.rghtclk and not self.stateful.moving then self.stateful.moving = self.stateful.rghtclk end
            self.stateful.dragging = true
            local moving = self.stateful.moving
            if moving then
                local ox, oy = self.ox, self.oy
                local dx, dy = x - ox, y - oy
                self:moveobj(moving, dx, dy)
                self.ox, self.oy = x, y
            elseif not self.menu.x then
                self.menu.x, self.menu.y = x, y
                self:draw()
            end
        end
    end,
    
    createlink = function (self, src, dst, srcind, dstind)
        if not srcind then srcind = src.obj.curoutput end
        if not dstind then dstind = dst.obj.curinput end
        local oldsrc = src.obj.outputs[srcind]
        local olddst = dst.obj.inputs[dstind]
        if oldsrc then
            oldsrc.obj.obj.inputs[oldsrc.ind] = nil
            oldsrc.obj.obj:input_change(oldsrc.ind)
        end
        if olddst then
            olddst.obj.obj.outputs[olddst.ind] = nil
            olddst.obj.obj:output_change(olddst.ind)
        end
        src.obj.outputs[src.obj.curoutput] = { obj = dst, ind = dstind }
        dst.obj.inputs[dst.obj.curinput] = { obj = src, ind = srcind }
        src.obj:output_change(srcind)
        dst.obj:input_change(dstind)
    end,
    
    destroylink = function (self, src, ind)
        if not ind then ind = src.obj.curoutput end
        local oldsrc = src.obj.outputs[ind]
        if oldsrc then
            src.obj.outputs[ind] = nil
            src.obj:output_change(ind)

            oldsrc.obj.obj.inputs[oldsrc.ind] = nil
            oldsrc.obj.obj:input_change(oldsrc.ind)
        end
    end,
    
    destroylink_dst = function (self, dst, ind)
        if not ind then ind = dst.obj.curinput end
        local olddst = dst.obj.inputs[ind]
        if olddst then
            dst.obj.inputs[ind] = nil
            dst.obj:input_change(ind)

            olddst.obj.obj.outputs[olddst.ind] = nil
            olddst.obj.obj:output_change(olddst.ind)
        end
    end,
    
    button_cb = function (self, button, pressed, x, y, status)
        if not pressed then pressed = 0 end
        if not x then x = self.ox end
        if not y then y = self.oy end
        if button == iup.BUTTON1 or not button then
            if pressed == 1 then
                self.stateful.leftbutton = true
                if self.stateful.rghtbutton then
                    self.stateful.panning = true
                else
                    local obj, ind = self:findobj(x, y)
                    if obj then
                        self.stateful.leftclk = obj
                        table.remove(self.objects, ind)
                        table.insert(self.objects, obj)
                    end
                    self.ox, self.oy = x, y
                    self.bx, self.by = x, y
                    self:draw()
                end
            else
                if not self.stateful.linking and self.stateful.leftclk and not self.stateful.dragging then
                    self.stateful.leftbutton = nil
                    self.stateful.leftclk.obj:activate()
                elseif self.stateful.linking then
                    local dest = self:findobj(x,y)
                    if not dest then
                        self:destroylink(self.stateful.linking)
                    elseif dest == self.stateful.linking then
                        self:setstatus(dalos.stypes.ERROR, "Can't link: origin is the same as destination")
                    elseif dest.obj.ninputs <= 0 then
                        self:setstatus(dalos.stypes.ERROR, "Can't link: destination has no input")
                    else
                        self:setstatus(dalos.stypes.INFO, "Linking '" .. self.stateful.linking.obj.name .. "' and '" .. dest.obj.name .. "'")
                        self:createlink(self.stateful.linking, dest)
                    end
                    self.stateful.linking = nil
                    self:draw()
                end
                self.stateful.panning = nil
                self.stateful.linking = nil
                self.stateful.leftclk = nil
                self.stateful.leftbutton = nil
                if not self.stateful.rghtbutton then self.stateful.dragging = nil end
            end
        end
        
        if button == iup.BUTTON3 or not button then
            if pressed == 1 then
                self.stateful.rghtbutton = true
                if self.stateful.leftbutton then
                    self.stateful.panning = true
                else
                    local obj, ind = self:findobj(x, y)
                    if obj then
                        self.stateful.rghtclk = obj
                        table.remove(self.objects, ind)
                        table.insert(self.objects, obj)
                    end
                    self.ox, self.oy = x, y
                    self.bx, self.by = x, y
                    self:draw()
                end
            else
                if not self.stateful.moving and self.stateful.rghtclk and not self.stateful.dragging then
                    self.stateful.rghtbutton = nil
                    self.stateful.rghtclk.obj:configure()
                    self:draw()
                elseif self.menu.x then
                    local dx, dy = x - self.menu.x, y - self.menu.y
                    local obj
                    if math.abs(dx) > math.abs(dy) then
                        if dx < 0 then
                            obj = dalosp.cross.west
                        else
                            obj = dalosp.cross.east
                        end
                    else
                        if dy < 0 then
                            obj = dalosp.cross.north
                        else
                            obj = dalosp.cross.south
                        end
                    end
                    if obj then dalosp.menu.add_object(self, obj, self.menu.x, self.menu.y) end
                    self.menu.x = nil
                    self.menu.y = nil
                    self:draw()
                elseif self.stateful.moving then
                    -- dropped somewhere... do something useful here ?
                end
                self.stateful.panning = nil
                self.stateful.moving = nil
                self.stateful.rghtclk = nil
                self.stateful.rghtbutton = nil
                if not self.stateful.leftbutton then self.stateful.dragging = nil end
            end
        end
    end,
    
    wheel_cb = function (self, delta, x, y, status)
        local obj = self:findobj(x, y)
        
        delta = -delta
        if delta > 0 then delta = math.floor(delta + 0.5) else delta = -math.floor(-delta + 0.5) end
        
        if obj then
            if iup.isshift(status) then
                obj.obj:change_curoutput(delta)
            elseif iup.isalt(status) then
                obj.obj:change_quicksetting(delta)
            else
                obj.obj:change_curinput(delta)
            end
        end
        
        self:draw()
    end,
    
    keypress_cb = function (self, c, press)
        if press ~= 1 then return end
        local obj, ind = self:findobj(self.stateful.mousepos.x, self.stateful.mousepos.y)
        if c == iup.K_cS then
            if obj then self:delobj(ind) end
        elseif c == iup.K_n then
            if not obj then return end
            local s, newname = iup.GetParam("Renaming", nil, "Set name: %s\n", obj.obj.name)
            if s and newname then obj.obj.name = newname end
            self:draw()
        end
    end,
    
    create = function (tab)
        tab.border = "No"
        tab.expand = "Yes"
        tab.minsize = "1x1"
        tab.rastersize = "1x1"
        local r = iup.canvas(tab)
        r.action = iupep.dbuffer.action
        r.draw = dalosp.canvas.draw
        r.resize_cb = iupep.dbuffer.resize_cb
        r.map_cb = iupep.dbuffer.map_cb
        r.unmap_cb = iupep.dbuffer.unmap_cb
        r.focus_cb = dalosp.canvas.focus_cb
        r.motion_cb = dalosp.canvas.motion_cb
        r.button_cb = dalosp.canvas.button_cb
        r.wheel_cb = dalosp.canvas.wheel_cb
        r.keypress_cb = dalosp.canvas.keypress_cb
        r.addobj = dalosp.canvas.addobj
        r.delobj = dalosp.canvas.delobj
        r.findobj = dalosp.canvas.findobj
        r.moveobj = dalosp.canvas.moveobj
        r.setobjplace = dalosp.canvas.setobjplace
        r.panning = dalosp.canvas.panning
        r.setstatus = dalosp.canvas.setstatus
        r.createlink = dalosp.canvas.createlink
        r.destroylink = dalosp.canvas.destroylink
        r.destroylink_dst = dalosp.canvas.destroylink_dst
        r.drawlink = dalosp.canvas.drawlink
        r.drawxmenu = dalosp.canvas.drawxmenu
        r.origin = { x = 0, y = 0 }
        r.menu = { }
        r.stateful = {}
        
        r.objects = {}
        
        dalos.active_canvas = r
        
        return r
    end,
}

dalosp.menu = {
    action_new = function (self)
        local d = dalos.active_canvas
        dalos:clean()
        
        d:setstatus(dalos.stypes.INFO, "Workspace cleaned")
    end,
    
    action_load = function (self)
        local dlg = iup.filedlg {
            dialogtype = "Open",
            filter = "*.dalos"
        }
        iup.Popup(dlg)
        if dlg.status == -1 then return end
        
        local s, v = pcall(Input, dlg.value)
        if not s then error("Problem loading file " .. dlg.value) end
        local f = preload(v)
        v:destroy()
        if not f then error("Syntax error loading file " .. dlg.value) end
        local data = f()
        local tlup = dalos.objectstypes_by_name
        local ot = dalos.objectstypes
        local d = dalos.active_canvas
        local lup = {}
        for k, v in ipairs(data.objects) do
            if not tlup[v.ntype] then error("Object " .. v.ntype .. " isn't declared") end
        end
        if data.imports then
            for i, v in ipairs(data.imports) do
                dalosp.menu.load_file(v)
            end
        end
        dalos:clean()
        for k, v in ipairs(data.objects) do
            local tab = { x = v.x, y = v.y, name = v.name }
            local o = ot[tlup[v.ntype]].constructor(d, tab, v.settings)
            for iobj, obj in ipairs(d.objects) do
                if obj.obj == o then
                    lup[iobj] = obj
                end
            end
        end
        for k, v in ipairs(data.links) do
            if not lup[v.src] then error("Can't find object for id src " .. v.src) end
            if not lup[v.dst] then error("Can't find object for id dst " .. v.dst) end
            d:createlink(lup[v.src], lup[v.dst], v.isrc, v.idst)
        end
        if data.cross then
            dalosp.cross = {}
            if data.cross.north then dalosp.cross.north = tlup[data.cross.north] end
            if data.cross.south then dalosp.cross.south = tlup[data.cross.south] end
            if data.cross.west then dalosp.cross.west = tlup[data.cross.west] end
            if data.cross.east then dalosp.cross.east = tlup[data.cross.east] end
        end
        
        d:setstatus(dalos.stypes.INFO, "Properly loaded")
    end,
    
    action_save = function(self)
        local s_obj = { }
        if not dalos.active_canvas then return end
        local d = dalos.active_canvas
        for i, v in ipairs(d.objects) do
            s_obj[i] = { x = v.x, y = v.y, name = v.obj.name, ntype = v.obj.ntype, settings = v.obj:get_settings(), lookup = v }
        end
        local s_links = { }
        for iobj, obj in ipairs(d.objects) do
            for iout, out in pairs(obj.obj.outputs) do
                for ilookup, lobj in ipairs(s_obj) do
                    if lobj.lookup == out.obj then
                        table.insert(s_links, { src = iobj, dst = ilookup, isrc = iout, idst = out.ind })
                    end
                end
            end
        end
        for i, v in ipairs(s_obj) do
            v.lookup = nil
        end
        local s_cross = { }
        if dalosp.cross.north then s_cross.north = dalosp.cross.north.name end
        if dalosp.cross.sorth then s_cross.sorth = dalosp.cross.sorth.name end
        if dalosp.cross.west then s_cross.west = dalosp.cross.west.name end
        if dalosp.cross.east then s_cross.east = dalosp.cross.east.name end
        local save = { objects = s_obj, links = s_links, cross = s_cross, imports = dalosp.imports }
        local dlg = iup.filedlg {
            dialogtype = "Save",
            dalos = "*.dalos",
        }
        iup.Popup(dlg)
        if dlg.status ~= -1 then
            local s, v = pcall(Output, dlg.value)
            if s then
                v:write "---- Dalos save\nlocal "
                dumpvars(v, dalos.version, "version")
                v:write "if dalos.version.MAJOR < version.MAJOR or dalos.version.MAJOR == version.MAJOR and dalos.version.MINOR < version.MINOR then error 'Dalos version too old for this save.' end\n\nlocal "
                dumpvars(v, save, "save")
                v:write "return save"
                v:destroy()
            else
                error("Failed opening " .. dlg.value .. " for writing")
            end
        end

        d:setstatus(dalos.stypes.INFO, "Properly saved")
    end,
    
    load_file = function (file)
        local s, v = pcall(load, file)
        if not s then return end
        if not dalosp.imports then dalosp.imports = {} end
        for i, v in ipairs(dalosp.imports) do
            if v == file then return end
        end
        table.insert(dalosp.imports, file)
    end,
    
    action_import = function (self)
        local dlg = iup.filedlg {
            dialogtype = "Open",
            filter = "*.lua",
        }
        iup.Popup(dlg)
        if dlg.status == -1 then return end
        
        local d = dalos.active_canvas
        dalosp.menu.load_file(dlg.value)
        d:setstatus(dalos.stypes.INFO, "Properly imported")
    end,
    
    action_reload = function (self)
        if not dalosp.imports then return end
        
        for i, v in ipairs(dalosp.imports) do
            pcall(load, v)
        end
        d:setstatus(dalos.stypes.INFO, "Properly reloaded all imported files")
    end,
    
    action_load_template = function (self)
        local dlg = iup.filedlg {
            dialogtype = "Open",
            filter = "*.dtpl",
        }
        iup.Popup(dlg)
        if dlg.status == -1 then return end
        
        local s, v = pcall(Input, dlg.value)
        if not s then error("Problem loading file " .. dlg.value) end
        local f = preload(v)
        v:destroy()
        if not f then error("Syntax error loading file " .. dlg.value) end
        local t = f()
        local data, otype, tname = t.data, t.otype, t.tname
        
        local tobj = dalos.objectstypes_by_name[otype]
        if not tobj then error("Unknown template object type: " .. otype) end
        tobj = dalos.objectstypes[tobj]

        dalos:register_obj(otype .. "::" .. tname, function(d, tab) tobj.constructor(d, tab, data) end, "Template")
        if tobj.registertemplate then tobj.registertemplate(data, tname) end
        local d = dalos.active_canvas
        
        d:setstatus(dalos.stypes.INFO, "Template properly loaded")
    end,
    
    action_exit = function (self)
        return iup.CLOSE
    end,
    
    action_about = function (self)
        local dlg = iup.messagedlg {
            DialogType = "Information",
            ButtonDefault = "1",
            Buttons = "OK",
            Title = "About",
            Value = 'DALOS ' .. dalos.version.string .. ' (c) 2009-2010 Nicolas "Pixel" Noble.\nThis is free software with ABSOLUTELY NO WARRANTY.\nPlease look at the COPYRIGHT file for details.',
        }
        dlg:popup()
        return iup.DEFAULT
    end,
    
    update_objects = function (self)
        local d = dalos.active_canvas
        if d and d.dialog then
            local newmenu = dalos.menu(dalos.active_canvas)
            -- copy anything from self to newmenu ? *shrug*
            d.dialog.menu = newmenu
        end
    end,
    
    add_object = function (canvas, object, x, y)
        object.constructor(canvas, { counter = object.counter, x = (x or 25) + 0, y = (y or 25) + 0}, {})
        object.counter = object.counter + 1
    end,
    
    set_cross = function (canvas, object, dir)
        if dir == dalosp.NORTH then
            dalosp.cross.north = object
        elseif dir == dalosp.SOUTH then
            dalosp.cross.south = object
        elseif dir == dalosp.EAST then
            dalosp.cross.east = object
        elseif dir == dalosp.WEST then
            dalosp.cross.west = object
        end
    end,
    
    create = function (canvas, tab)
        local item_new = iup.item { title = "New" }
        item_new.action = dalosp.menu.action_new
        local item_load = iup.item { title = "Load workspace" }
        item_load.action = dalosp.menu.action_load
        local item_save = iup.item { title = "Save workspace" }
        item_save.action = dalosp.menu.action_save
        local item_import = iup.item { title = "Import Lua file" }
        item_import.action = dalosp.menu.action_import
        local item_reload = iup.item { title = "Reload all" }
        item_reload.action = dalosp.menu.action_reload
        local item_load_template = iup.item { title = "Load Template" }
        item_load_template.action = dalosp.menu.action_load_template
        local item_exit = iup.item { title = "Exit" }
        item_exit.action = dalosp.menu.action_exit
        local item_about = iup.item { title = "About" }
        item_about.action = dalosp.menu.action_about
        local add_menu = { }
        local north_menu = { radio = "1" }
        local east_menu = { radio = "1" }
        local west_menu = { radio = "1" }
        local south_menu = { radio = "1" }
        local item
        local add_submenus = { }
        local north_submenus = { }
        local east_submenus = { }
        local west_submenus = { }
        local south_submenus = { }
        local category
        local add_smenu, north_smenu, east_smenu, west_smenu, south_smenu
        local categories = {}
        for k, v in ipairs(dalos.objectstypes) do
            category = v.category
            if category then
                if not add_submenus[category] then
                    add_submenus[category] = { }
                    north_submenus[category] = { }
                    south_submenus[category] = { }
                    east_submenus[category] = { }
                    west_submenus[category] = { }
                    table.insert(categories, 1, category)
                end
                add_smenu = add_submenus[category]
                north_smenu = north_submenus[category]
                east_smenu = east_submenus[category]
                west_smenu = west_submenus[category]
                south_smenu = south_submenus[category]
            else
                add_smenu = add_menu
                north_smenu = north_menu
                east_smenu = east_menu
                west_smenu = west_menu
                south_smenu = south_menu
            end
            item = iup.item { title = v.name }
            item.action = function (self) dalosp.menu.add_object(canvas, v) end
            table.insert(add_smenu, item)
            item = iup.item { title = v.name }
            item.action = function (self) dalosp.menu.set_cross(canvas, v, dalosp.NORTH) end
            table.insert(north_smenu, item)
            item = iup.item { title = v.name }
            item.action = function (self) dalosp.menu.set_cross(canvas, v, dalosp.EAST) end
            table.insert(east_smenu, item)
            item = iup.item { title = v.name }
            item.action = function (self) dalosp.menu.set_cross(canvas, v, dalosp.WEST) end
            table.insert(west_smenu, item)
            item = iup.item { title = v.name }
            item.action = function (self) dalosp.menu.set_cross(canvas, v, dalosp.SOUTH) end
            table.insert(south_smenu, item)
        end
        for i, v in ipairs(categories) do
            table.insert(add_menu, 1, iup.submenu { iup.menu(add_submenus[v]), title = v })
            table.insert(north_menu, 1, iup.submenu { iup.menu(north_submenus[v]), title = v })
            table.insert(south_menu, 1, iup.submenu { iup.menu(south_submenus[v]), title = v })
            table.insert(east_menu, 1, iup.submenu { iup.menu(east_submenus[v]), title = v })
            table.insert(west_menu, 1, iup.submenu { iup.menu(west_submenus[v]), title = v })
        end
        local menu_file = iup.submenu { iup.menu { item_new, item_load, item_save, iup.separator {}, item_import, item_reload, iup.separator {}, item_load_template, iup.separator {}, item_exit }, title = "File" }
        local menu_add = iup.submenu { iup.menu(add_menu), title = "Add" }
        local menu_cross = iup.submenu { iup.menu {
            iup.submenu { iup.menu(north_menu), title = "North" },
            iup.submenu { iup.menu(east_menu), title = "East" },
            iup.submenu { iup.menu(west_menu), title = "West" },
            iup.submenu { iup.menu(south_menu), title = "South" },
        }, title = "Cross", }
        local menu_help = iup.submenu { iup.menu { item_about }, title = "Help" }
        local r = iup.menu { menu_file, menu_add, menu_cross, menu_help }
        r.update_objects = dalosp.menu.update_objects
        r.add_menu = add_menu
        
        dalos.active_menu = r
        
        return r
    end,
}

dalosp.object = {
    use_template = function (self, templates)
        local ttpllst = {}
        for n, v in pairs(templates) do
            table.insert(ttpllst, n)
        end
        if #ttpllst == 0 then
            local dlg = iup.messagedlg {
                dialogtype = "Warning",
                title = "No template",
                value = "There's no template to use.\nPlease load templates from the main menu first.",
            }
            dlg:popup()
            return iup.DEFAULT
        end
        table.sort(ttpllst)
        local tpllst = "|"
        for i, n in ipairs(ttpllst) do
            tpllst = tpllst .. n .. "|"
        end
        local s, tind = iup.GetParam("Use Template", nil, "Template: %i" .. tpllst .. "\n", 0)
        if not s then return iup.DEFAULT end
        self:apply_template(templates[ttpllst[tind]])
    end,
    
    auto_template = function (self, templates, name)
        for n, v in pairs(templates) do
            if n == name then
                self:apply_template(v)
            end
        end
    end,
    
    load_template = function (self)
        local dlg = iup.filedlg {
            dialogtype = "Open",
            filter = "*.dtpl",
        }
        iup.Popup(dlg)
        if (dlg.status + 0) == -1 then return end
        
        local s, v = pcall(Input, dlg.value)
        if not s then error("Problem loading file " .. dlg.value) end
        local f = preload(v)
        v:destroy()
        if not f then error("Syntax error loading file " .. dlg.value) end
        local t = f()
        local data, otype, tname = t.data, t.otype, t.tname
        if otype ~= self.ntype then error("Wrong template type: " .. otype) end
        
        self:apply_template(data.template)
    end,
    
    default_draw = function (self, cv, x, y, w, h)
        local x1, x2, y1, y2 = x, x + w, y, y + h
        y1, y2 = cv:InvertYAxis(y2), cv:InvertYAxis(y1)
        local cx, cy = (x1 + x2) / 2, (y1 + y2) / 2
        cv:Foreground(self.color)
        cv:Box(x1, x2, y1, y2)
        cv:Foreground(cd.BLACK)
        cv:Rect(x1, x2, y1, y2)
        cv:TextAlignment(cd.SOUTH)
        cv:Text(cx, y2, self.name)
        cv:TextAlignment(cd.NORTH)
        if self.ninputs >= 1 then
            cv:Text(x1, y1, self.curinput .. "/" .. self.ninputs)
        end
        if self.noutputs >= 1 then
            cv:Text(x2, y1, self.curoutput .. "/" .. self.noutputs)
        end
        if self.quicksetting then
            cv:Text(cx, y1, self.quicksetting)
        end
    end,
    
    get_linked_input = function (self, ind)
        local ni = self.inputs[ind]
        if ni then
            local ii = ni.ind
            local io = ni.obj
            return io.obj:get_output(ii)
        else
            return nil
        end
    end,
    
    default_activate = function (self)
        print "default activate"
    end,
    
    default_configure = function (self)
        local s, n = iup.GetParam("Change name", nil, "Name: %s\n", self.name)
        
        if s then self.name = n end
    end,
    
    change_curinput = function (self, delta)
        if self.ninputs <= 1 then return end
        self.curinput = self.curinput + delta
        if self.curinput > self.ninputs then self.curinput = self.ninputs end
        if self.curinput <= 0 then self.curinput = 1 end
    end,
    
    change_curoutput = function (self, delta)
        if self.noutputs <= 1 then return end
        self.curoutput = self.curoutput + delta
        if self.curoutput > self.noutputs then self.curoutput = self.noutputs end
        if self.curoutput <= 0 then self.curoutput = 1 end
    end,
    
    default_change_quicksetting = function (self, delta)
    end,
    
    default_getoutput = function (self, ind)
        return self.houtputs[ind]
    end,
    
    default_inputchange = function (self, ind)
    end,
    
    default_outputchange = function (self, ind)
    end,
    
    set_houtput = function (self, h, ind)
        if not ind then ind = 1 end
        self.houtputs[ind] = h
        local obj = self.outputs[ind]
        if obj then
            obj.obj.obj:input_change(obj.ind)
        end
    end,
    
    default_get_settings = function (self)
        return {}
    end,
    
    save_template = function (self, template)
        if not template then template = self:gen_template() end
        local dlg = iup.filedlg {
            dialogtype = "Save",
            filter = "*.dtpl",
        }
        iup.Popup(dlg)
        if dlg.status == -1 then return end
        local s, name, v
        s, name = iup.GetParam("Export template", nil, "Template name: %s\n", "")
        if not s then return end
        s, v = pcall(Output, dlg.value)
        if s then
            v:write "---- Dalos template\nlocal "
            dumpvars(v, dalos.version, "version")
            v:write "if dalos.version.MAJOR < version.MAJOR or dalos.version.MAJOR == version.MAJOR and dalos.version.MINOR < version.MINOR then error 'Dalos version too old for this save.' end\n\nlocal "
            dumpvars(v, template, "template")
            v:write("return { data = template, otype = '" .. self.ntype .. "', tname = '" .. name .. "' }\n")
            v:destroy()
        else
            error("Failed opening " .. dlg.value .. " for writing")
        end
    end,
    
    create = function (dcanvas, tab, extra)
        if not tab then tab = {} end
        if not tab.name then
            tab.name = tab.default_name
            if tab.counter then
                tab.name = tab.name .. " " .. tab.counter
            end
        end
        local obj = {
            draw = tab.draw or dalosp.object.default_draw,
            name = tab.name or "NoName",
            color = tab.color or cd.GRAY,
            ninputs = tab.ninputs or 0,
            noutputs = tab.noutputs or 0,
            inputs = {},
            outputs = {},
            curinput = 1,
            curoutput = 1,
            ntype = tab.ntype,
            quicksetting = tab.quicksetting,
            otype = tab.otype or dalos.objtype.DUMMY,
            activate = tab.activate or dalosp.object.default_activate,
            configure = tab.configure or dalosp.object.default_configure,
            change_curinput = dalosp.object.change_curinput,
            change_curoutput = dalosp.object.change_curoutput,
            change_quicksetting = tab.change_quicksetting or dalosp.object.default_change_quicksetting,
            extra = extra,
            get_output = tab.getoutput or dalosp.object.default_getoutput,
            input_change = tab.input_change or dalosp.object.default_inputchange,
            output_change = tab.output_change or dalosp.object.default_outputchange,
            set_houtput = dalosp.object.set_houtput,
            get_settings = tab.get_settings or dalosp.object.default_get_settings,
            houtputs = {},
            get_linked_input = dalosp.object.get_linked_input,
            save_template = dalosp.object.save_template,
            load_template = dalosp.object.load_template,
            use_template = dalosp.object.use_template,
            auto_template = dalosp.object.auto_template,
            apply_template = tab.apply_template,
            gen_template = tab.gen_template,
            dcanvas = dcanvas,
        }
        
        if tab.otype and not tab.c then
            if tab.otype == dalos.objtype.DUMMY then
                obj.color = cd.GRAY
            elseif tab.otype == dalos.objtype.HANDLE then
                obj.color = cd.CYAN
            elseif tab.otype == dalos.objtype.LUA_VIEWER then
                obj.color = cd.MAGENTA
            elseif tab.otype == dalos.objtype.LUA_FILTER then
                obj.color = cd.YELLOW
            else
                obj.color = cd.DARK_RED
            end
        end
        
        dcanvas:addobj(obj, tab.x or 0, tab.y or 0, tab.w or 50, tab.h or 50)
        
        return obj
    end,
}

dalosp.status = {
    create = function ()
        local r
        
        local s_square = iup.canvas { size = "10x", expand = "Vertical", border = "No", bgcolor = "0 255 0", }
        local s_label = iup.label { expand = "Horizontal" }
        
        r = iup.frame {
            iup.hbox {
                s_square,
                iup.label { separator = "Vertical" },
                s_label,
            },
            expand = "Horizontal",
        }
        
        r.square = s_square
        r.label = s_label
        
        dalos.active_status = r
        
        return r
    end,
}

dalos.canvas = dalosp.canvas.create
dalos.menu = dalosp.menu.create
dalos.object = dalosp.object.create
dalos.status = dalosp.status.create
dalos.stypes = dalosp.canvas.stypes

dalos.objtype = {
    UNKNOWN = 0,
    DUMMY = 1,
    HANDLE = 2,
    LUA_FILTER = 3,
    LUA_VIEWER = 4,
}

----------------

load "dalos-luahandle.lua"
load "dalos-hexview.lua"
load "dalos-binaryops.lua"
load "dalos-limiter.lua"
load "dalos-textbuffer.lua"
load "dalos-input.lua"
load "dalos-tee.lua"
load "dalos-buffer.lua"
load "dalos-luafilter.lua"
load "dalos-struct.lua"
load "dalos-textview.lua"
load "dalos-cd.lua"
load "dalos-framebuffer.lua"
load "dalos-isoviewer.lua"

----------------

function dalos:main()
    local d, m, s
    
    d = self.canvas {}
    m = self.menu(d)
    s = self.status()

    dlg = iup.dialog { iup.vbox { d, s }, title = "Dalos", menu = m, size = "400x250", shrink = "Yes", }

    d.dialog = dlg

    d:setstatus(dalos.stypes.INFO, "Dalos version " .. dalos.version.string .. " started")
    
    local old_error = error
    error = function(...) d:setstatus(dalos.stypes.ERROR, "Got a Lua error") old_error(...) end

    dlg:show()
    iup.MainLoop()
    dlg:hide()
end

if not archive_main then dalos:main() end