load "iupe-hexview.lua"
load "iupe-hexview-toolbox.lua"

dalosp.hexview = {
    activate = function (self)
        self.extra.hvdlg:show()
    end,
    
    input_change = function (self, ind)
        local extra = self.extra
        local hv = extra.hv
        local h = self:get_linked_input(ind)
        if not h then
            self.color = cd.YELLOW
            hv:updatehandle(nil)
            self.dcanvas:draw()
            return
        end
        if not h:canread() or not h:canseek() then
            self.color = cd.RED
            hv:updatehandle(nil)
            self.dcanvas:draw()
            return
        end
        self.color = cd.GREEN
        for i = 1, 12 do
            self:set_houtput(nil, i)
            self.oldcursors[i] = -1
        end
        hv:updatehandle(h)
        self.dcanvas:draw()
    end,
    
    configure = function (self)
    end,
    
    output_change = function (self, ind)
        self.watchees[ind] = self.outputs[ind] and true or false
    end,
    
    update_houtput = function (self, ind, cursor)
        local h = self:get_linked_input(1)
        local maxsixe = h:getsize()
        if h and self.watchees[ind] then
            if cursor < maxsize then
                self:set_houtput(nil, ind)
            end
            local obj = {
                h = h,
                hvo = self,
                ind = ind,
                origin = cursor,
                offset = 0,
                size = maxsize - cursor,
                canread = function (self) return true end,
                canwrite = function (self) return false end,
                canseek = function (self) return true end,
                canwatch = function (self) return self.h:canwatch() end,
                getname = function (self) return self.hvo.name .. ":" .. self.ind end,
                tell = function (self) return self.offset end,
                getsize = function (self) return self.size end,
                getmodif = function (self) return self.hvo:getmodif() end,
                flush = function (self) return self.hvo:flush() end,
                seek = function (self, offset, wheel) 
                    if wheel == SEEK_SET then
                        self.offset = offset
                    elseif wheel == SEEK_CUR then
                        self.offset = self.offset + offset
                    elseif wheel == SEEK_END then
                        self.offset = self.size + offset
                    else
                        error "Unknown wheel"
                    end
                    if self.offset < 0 then self.offset = 0 end
                    if self.offset >= self.size then self.offset = self.size end
                    self.h:seek(self.offset + self.origin)
                    return self.offset
                end,
                read = function (self, userdata, count)
                    count = math.min(count, self.size - self.offset)
                    
                    if count == 0 then
                        if self.got_eof then self.lh:close() end
                        self.got_eof = true
                        return 0
                    end
                    
                    self.got_eof = false
                    
                    local r = self.h:read(count, userdata)
                    self.offset = self.offset + r
                    if r == 0 then self.got_eof = true end
                    return r
                end,
            }
            local newh = HandleLua(obj)
            obj.lh = newh
            self:set_houtput(newh, ind)
        end
    end,
    
    dalos_hv_cb = function (self, hv, reset)
        local m
        for i = 1, 10 do
            m = hv.markers[i]
            if self.oldcursors[i] ~= m then
                self:update_houtput(i, m)
                self.oldcursors[i] = m
            end
        end
        
        m = hv.kcursor
        if self.oldcursors[11] ~= m then
            self:update_houtput(11, m)
            self.oldcursors[11] = m
        end
        
        m = hv.mcursor
        if self.oldcursors[12] ~= m then
            self:update_houtput(12, m)
            self.oldcursors[12] = m
        end
    end,
    
    create = function (d, tab)
        tab.otype = dalos.objtype.LUA_FILTER
        tab.activate = dalosp.hexview.activate
        tab.input_change = dalosp.hexview.input_change
        tab.output_change = dalosp.hexview.output_change
        tab.configure = dalosp.hexview.configure
        tab.ninputs = 1
        tab.noutputs = 12
        tab.default_name = "Hexview"
        
        local extra = { }
        
        local obj = dalos.object(d, tab, extra)

        local hv = iupe.hexview { }
        local hvtb = iupe.hexview_toolbox { hexview = hv }
        local hvdlg = iup.dialog { iup.hbox { iup.frame { hv }, iup.sbox { direction = "WEST", hvtb } }, title = obj.name }
        
        extra.hv = hv
        extra.hvtb = hvtb
        extra.hvdlg = hvdlg
        
        obj.oldcursors = { }
        obj.watchees = { }
        obj.update_houtput = dalosp.hexview.update_houtput
        for i = 1, 12 do obj.oldcursors[i] = -1 end
        
        hv:registercb(dalosp.hexview.dalos_hv_cb, obj)
        
        return obj
    end,
}

dalos.hexview = dalosp.hexview.create
dalos:register_obj("Hexview", dalos.hexview)