--- @class charty.lib.MiddleClass
local middleclass = {
    _VERSION     = 'middleclass v4.1.1',
    _DESCRIPTION = 'Object Orientation for Lua',
    _URL         = 'https://github.com/kikito/middleclass',
    _LICENSE     = [[
    MIT LICENSE

    Copyright (c) 2011 Enrique García Cota

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the
    "Software"), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  ]]
}

local function _createIndexWrapper(aClass, f)
    if f == nil then
        return aClass.__instanceDict
    elseif type(f) == "function" then
        return function(self, name)
            local value = aClass.__instanceDict[name]

            if value ~= nil then
                return value
            else
                return (f(self, name))
            end
        end
    else -- if  type(f) == "table" then
        return function(self, name)
            local value = aClass.__instanceDict[name]

            if value ~= nil then
                return value
            else
                return f[name]
            end
        end
    end
end

local function _propagateInstanceMethod(aClass, name, f)
    f = name == "__index" and _createIndexWrapper(aClass, f) or f
    aClass.__instanceDict[name] = f

    for subclass in pairs(aClass.subclasses) do
        if rawget(subclass.__declaredMethods, name) == nil then
            _propagateInstanceMethod(subclass, name, f)
        end
    end
end

local function _declareInstanceMethod(aClass, name, f)
    aClass.__declaredMethods[name] = f

    if f == nil and aClass.super then
        f = aClass.super.__instanceDict[name]
    end

    _propagateInstanceMethod(aClass, name, f)
end

local function _tostring(self) return "class " .. self.name end
local function _call(self, ...) return self:new(...) end

local function _createClass(name, path, super)
    local dict = {}
    dict.__index = dict

    local rawPath = path
    local parentDir = comet.parentDirectory .. "."
    if path and path:startsWith(parentDir) then
        path = "comet." .. path:sub(#parentDir + 1)
    end
    if path and path:startsWith((comet.settings.srcDirectory .. ".")) then
        path = string.sub(path, #(comet.settings.srcDirectory .. ".") + 1)
    end
    if path and path:endsWith(name:lower()) then
        path = path:sub(1, #path - #name) .. name
    end
    local aClass = {
        name = name,
        path = path,
        rawPath = rawPath,
        super = super,
        static = {},
        __instanceDict = dict,
        __declaredMethods = {},
        subclasses = setmetatable({}, { __mode = 'k' })
    }
    if super then
        setmetatable(aClass.static, {
            __index = function(_, k)
                local result = rawget(dict, k)
                if result == nil then
                    return super.static[k]
                end
                return result
            end
        })
    else
        setmetatable(aClass.static, { __index = function(_, k) return rawget(dict, k) end })
    end
    setmetatable(aClass, {
        __index = aClass.static,
        __tostring = _tostring,
        __call = _call,
        __newindex = _declareInstanceMethod
    })
    return aClass
end

local function _includeMixin(aClass, mixin)
    assert(type(mixin) == 'table', "mixin must be a table")

    for name, method in pairs(mixin) do
        if name ~= "included" and name ~= "static" then aClass[name] = method end
    end

    for name, method in pairs(mixin.static or {}) do
        aClass.static[name] = method
    end

    if type(mixin.included) == "function" then mixin:included(aClass) end
    return aClass
end

local DefaultMixin = {
    __tostring   = function(self) return "instance of " .. tostring(self.class) end,

    __init__     = function(self, ...) end,

    isInstanceOf = function(self, aClass)
        return type(aClass) == 'table'
            and type(self) == 'table'
            and (self.class == aClass
                or type(self.class) == 'table'
                and type(self.class.isSubclassOf) == 'function'
                and self.class:isSubclassOf(aClass))
    end,

    static       = {
        allocate = function(self)
            assert(type(self) == 'table', "Make sure that you are using 'Class:allocate' instead of 'Class.allocate'")
            return setmetatable({ class = self }, self.__instanceDict)
        end,

        new = function(self, ...)
            assert(type(self) == 'table', "Make sure that you are using 'Class:new' instead of 'Class.new'")
            local instance = self:allocate()
            instance:__init__(...)
            return instance
        end,

        finalize = function(self) return self end, -- compat with class library i used to use (classy)

        subclass = function(self, name, path)
            assert(type(self) == 'table', "Make sure that you are using 'Class:subclass' instead of 'Class.subclass'")
            assert(type(name) == "string", "You must provide a name(string) for your class")

            local subclass = _createClass(name, path, self)

            for methodName, f in pairs(self.__instanceDict) do
                if not (methodName == "__index" and type(f) == "table") then
                    _propagateInstanceMethod(subclass, methodName, f)
                end
            end
            subclass.__init__ = function(instance, ...) return self.__init__(instance, ...) end

            self.subclasses[subclass] = true
            self:subclassed(subclass)

            return subclass, self
        end,

        subclassed = function(self, other) end,

        isSubclassOf = function(self, other)
            return type(other) == 'table' and
                type(self.super) == 'table' and
                (self.super == other or self.super:isSubclassOf(other))
        end,

        include = function(self, ...)
            assert(type(self) == 'table', "Make sure you that you are using 'Class:include' instead of 'Class.include'")
            for _, mixin in ipairs({ ... }) do _includeMixin(self, mixin) end
            return self
        end
    }
}

function middleclass.isinstanceof(t, cl)
    return type(t) == "table" and t.isInstanceOf ~= nil and t:isInstanceOf(cl)
end

function middleclass.class(name, path, super)
    assert(type(name) == 'string', "A name (string) is needed for the new class")
    return super and super:subclass(name, path) or _includeMixin(_createClass(name, path), DefaultMixin)
end

setmetatable(middleclass, { __call = function(_, ...) return middleclass.class(...) end })

return middleclass