-- debug --
if os.getenv("LOCAL_LUA_DEBUGGER_VSCODE") == "1" then
    DEBUG = true
    require("lldebugger").start()
else DEBUG = false end

-- libraries --
---@type Object
Object = require 'lib/classic/classic'
---@type Baton
Baton = require 'lib/baton/baton'
---@type Timer
Timer = require 'lib/hump/timer'

HC = require 'lib/hc'

Camera = require 'lib/cameramod/camera'
require 'lib/cameramod/Shake'

-- generic objects --
Room = require 'obj/Room'
Area = require 'obj/Area'
GameObject = require 'obj/GameObject'

function love.load()
    -- screen setup
    love.graphics.setDefaultFilter("nearest")
    love.graphics.setLineStyle("rough")
    resize(2)

    ---@type Room|nil
    current_room = nil

    -- load game objects
    local game_objects = {}
    print('loading game objects:')
    recursiveEnumerate('obj/game', game_objects)
    for _,v in ipairs(game_objects) do print('',v) end
    requireFiles(game_objects, true)

    -- load rooms
    local room_files = {}
    print('loading rooms:')
    recursiveEnumerate('rooms', room_files)
    for _,v in ipairs(room_files) do print('',v) end
    requireFiles(room_files, true)

    -- load input
    input = Baton.new {
        controls = {
            left = {'key:left', 'key:a'},
            right = {'key:right', 'key:d'},
            up = {'key:up', 'key:w'},
            down = {'key:down', 'key:s'},
            action = {'key:z', 'key:space'},
            f1 = {'key:f1'}, f2 = {'key:f2'}, f3 = {'key:f3'}
        },
        pairs = {
            move = {'left', 'right', 'up', 'down'}
        }
    }
    camera = Camera()

    gotoRoom('Stage')
end

function love.update(dt)
    if current_room then current_room:update(dt) end
    input:update(dt)
    if input:pressed('f1') then gotoRoom('CircleRoom') end
    if input:pressed('f3') then camera:shake(4, 60, 1) end

    camera:update(dt)
end

function love.draw()
    if current_room then current_room:draw() end
end

---Enumerates files in a folder and inserts them to a provided table.
---@param folder string path to folder to scan
---@param file_list table table to be inserted to
function recursiveEnumerate(folder, file_list)
    local items = love.filesystem.getDirectoryItems(folder)
    for _, item in ipairs(items) do
        local file = folder .. '/' .. item
        local info = love.filesystem.getInfo(file)

        if info then  -- exists (covers both files and directories)
            if info.type == "file" then
                table.insert(file_list, file)
            elseif info.type == "directory" then
                recursiveEnumerate(file, file_list)
            end
        end
    end
end

---Load files table as lua modules.
---@param files table table containing files to be loaded
---@param should_return boolean|nil whether required files return a table/object
function requireFiles(files, should_return)
    local returns = should_return or false
    for _, file in ipairs(files) do
        local module = file:sub(1, -5)
        if not returns then require(module) else
            local filename = module:match("([^/]+)$")
            _G[filename] = require(module)
        end
    end
end

---Go to a specific room.
---@param room_type string the name of the room as registered
---@param ... any arguments passed to the room constructor
function gotoRoom(room_type, ...)
    local Class = _G[room_type]
    if not Class then
        error("room '"..room_type.."' not found in _G")
    end
    if type(Class) ~= "table" and type(Class) ~= "function" then
        error("room '"..room_type.."' is not callable (got "..type(Class)..", does room return itself?)")
    end
    current_room = _G[room_type](...)
end

---Generates and returns random UUID string
---@return string
function UUID()
    local fn = function(x)
        local r = math.random(16) - 1
        r = (x == "x") and (r + 1) or (r % 4) + 9
        return ("0123456789abcdef"):sub(r, r)
    end
    return (("xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx"):gsub("[xy]", fn))
end

---Resize window
---@param s number scale setting
function resize(s)
    love.window.setMode(s*gw, s*gh)
    sx, sy = s, s
end

---Returns random number
---@param min number minimum of range
---@param max number maximum of range
---@return number
function random(min, max)
    local min, max = min or 0, max or 1
    return (min > max and (love.math.random()*(min - max) + max)) or (love.math.random()*(max - min) + min)
end