require("imgui")
local class =  require("class")
local DebugWindow = require("debug_overlay.debugwindow")

local commands = require("debug_overlay.console.commands")
local Console = class(DebugWindow)

local INFO = 1
local DEBUG = 2
local LOG = 3
local WARN = 4
local ERROR = 5

local function bind(new_self, fun, ...)
    return function(...)
        fun(new_self, ...)
    end
end

local function splitArgs(text)
    local result = {}
    local e = 0
    while true do
        local b = e+1
        b = text:find("%S",b)
        if b==nil then break end
        if text:sub(b,b)=="'" then
            e = text:find("'",b+1)
            b = b+1
        elseif text:sub(b,b)=='"' then
            e = text:find('"',b+1)
            b = b+1
        else
            e = text:find("%s",b+1)
        end
        if e==nil then e=#text+1 end
        result[#result+1] = text:sub(b,e-1)
    end
    return result
end

function Console:init()
    self.shortcut = "f12"
    self.logs = {}
    self.logs_filter_toggles = {}
    self.visible = false;
    self.input_text = "";
    self.commands = {}
    self.command_helps = {}
    self.take_focus = false
    self.scroll_to_bottom = true

    for i=1,5 do
        self.logs_filter_toggles[i] = true
    end

    for i,v in pairs(commands) do
        self:registerCommand(i, bind(self, commands[i].fun), v.help)
    end

end

function Console:render()
    imgui.SetNextWindowPos(0, love.graphics.getHeight() - 200, 1);
    imgui.SetNextWindowSize(love.graphics.getWidth(), 200);

    imgui.Begin("Console", nil, {"NoCollapse", "NoResize", "NoMove", "NoTitleBar"})

    if imgui.Button("Bottom") then self.scroll_to_bottom = true end
    for k,v in ipairs({"Info", "Debug", "Log", "Warn", "Error"}) do
        imgui.SameLine()
        if imgui.Checkbox(v, self.logs_filter_toggles[k]) then
            self.logs_filter_toggles[k] = not self.logs_filter_toggles[k]
        end
    end


    imgui.BeginChild("Console log", 0,-imgui.GetItemsLineHeightWithSpacing())

        for k,l in ipairs(self.logs) do
            local color = 0xFFFFFF
            if self.logs_filter_toggles[l.level]  then
                if l.level == 1 then
                    imgui.PushStyleColor("Text", 0.6,0.6,0.6,1)
                elseif l.level == 2 then
                    imgui.PushStyleColor("Text", 0.4,0.4,0.6,1)
                elseif l.level == 3 then
                    imgui.PushStyleColor("Text", 1,1,1,1)
                elseif l.level == 4 then
                    imgui.PushStyleColor("Text", 1,1,0,1)
                elseif l.level == 5 then
                    imgui.PushStyleColor("Text", 1,0.2,0.2,1)
                end
                imgui.TextUnformatted(l.msg)
                imgui.PopStyleColor(1)
            end
        end
        if self.scroll_to_bottom then
            imgui.SetScrollHere();
            self.scroll_to_bottom = false;
        end
    imgui.EndChild()


    local status = false
    imgui.PushItemWidth(imgui.GetContentRegionAvailWidth())
    status, self.input_text = imgui.InputText("", self.input_text, 256, {"EnterReturnsTrue"})
    imgui.PopItemWidth()

    if self.take_focus then
        imgui.SetKeyboardFocusHere(0)
        self.take_focus = false
    end

    if status then
        if self.input_text == "" then return end
        local command_line = self.input_text
        local parts = splitArgs(command_line)
        local args = {}
        for i=2,#parts do
            args[i-1] = parts[i]
        end
        self:log("> "..self.input_text, 1)

        local fun_name = parts[1]:lower()
        local command = self.commands[fun_name]
        if not command then
            self:log("Command not found : "..fun_name, ERROR)
        else
            local processed_commands = {}
            local f = function()
                command(unpack(args))
            end
            local success, result = xpcall(f, function(err) return debug.traceback(err) end)
            if not success then
                self:log(result, ERROR)
            end

        end

        self.input_text = ""
        self.take_focus = true
    end
    imgui.End()
end


function Console:toggle()
    DebugWindow.toggle(self)
    if self.visible then
        self.take_focus = true
    end
end

function Console:log(str, level)
    self.logs[#self.logs + 1] = {
        msg = str,
        level = level or 3
    }
    self.scroll_to_bottom = true
end

function Console:info(str)
    self:log(str, INFO)
end

function Console:warn(str)
    self:log(str, WARN)
end

function Console:debug(str)
    self:log(str, DEBUG)
end


function Console:error(str)
    self:log(str, ERROR)
end

function Console:registerCommand(name, fun, help)
    self.commands[name] = fun
    if help then
        self.command_helps[name] = help
    end
end

return Console