local Event = require 'utils.event'
local Server = require 'utils.server'
local Global = require 'utils.global'

local this = {
    difficulties = {
        [1] = {
            name = 'Peaceful',
            value = 0.25,
            color = {r = 0.00, g = 0.45, b = 0.00},
            print_color = {r = 0.00, g = 0.8, b = 0.00}
        },
        [2] = {
            name = 'Piece of cake',
            value = 0.5,
            color = {r = 0.00, g = 0.35, b = 0.00},
            print_color = {r = 0.00, g = 0.6, b = 0.00}
        },
        [3] = {
            name = 'Easy',
            value = 0.75,
            color = {r = 0.00, g = 0.25, b = 0.00},
            print_color = {r = 0.00, g = 0.4, b = 0.00}
        },
        [4] = {
            name = 'Normal',
            value = 1,
            color = {r = 0.00, g = 0.00, b = 0.25},
            print_color = {r = 0.0, g = 0.0, b = 0.5}
        },
        [5] = {
            name = 'Hard',
            value = 1.5,
            color = {r = 0.25, g = 0.00, b = 0.00},
            print_color = {r = 0.4, g = 0.0, b = 0.00}
        },
        [6] = {
            name = 'Nightmare',
            value = 3,
            color = {r = 0.35, g = 0.00, b = 0.00},
            print_color = {r = 0.6, g = 0.0, b = 0.00}
        },
        [7] = {
            name = 'Impossible',
            value = 5,
            color = {r = 0.45, g = 0.00, b = 0.00},
            print_color = {r = 0.8, g = 0.0, b = 0.00}
        }
    },
    tooltip = {
        [1] = '',
        [2] = '',
        [3] = '',
        [4] = '',
        [5] = '',
        [6] = '',
        [7] = ''
    },
    difficulty_vote_value = 1,
    difficulty_vote_index = 1,
    difficulty_poll_closing_timeout = 54000,
    difficulty_player_votes = {},
    gui_width = 108,
    name = 'Easy',
    print_color = {r = 0.00, g = 0.4, b = 0.00},
    button_tooltip = nil
}

local Public = {}

Global.register(
    this,
    function(t)
        this = t
    end
)

function Public.set_tooltip(...)
    if type(...) == 'table' then
        this.tooltip = ...
    end
end

function Public.set_difficulties(...)
    if type(...) == 'table' then
        this.difficulties = ...
    end
end

function Public.set_poll_closing_timeout(value)
    this.difficulty_poll_closing_timeout = value or game.tick + 3600 * 20
end

function Public.get(key)
    if key then
        return this[key]
    else
        return this
    end
end

function Public.get_difficulty_vote_index()
    if this.difficulty_vote_index then
        return this.difficulty_vote_index
    end
end

function Public.difficulty_gui()
    local tooltip = 'Current difficulty of the map is ' .. this.name .. '.'

    for _, player in pairs(game.connected_players) do
        if player.gui.top['difficulty_gui'] then
            player.gui.top['difficulty_gui'].caption = this.name
            player.gui.top['difficulty_gui'].tooltip = this.button_tooltip or tooltip
            player.gui.top['difficulty_gui'].style.font_color = this.print_color
        else
            local b =
                player.gui.top.add {
                type = 'button',
                caption = this.name,
                tooltip = tooltip,
                name = 'difficulty_gui'
            }
            b.style.font = 'heading-2'
            b.style.font_color = this.print_color
            b.style.minimal_height = 38
            b.style.minimal_width = this.gui_width
        end
    end
end

local function poll_difficulty(player)
    if player.gui.center['difficulty_poll'] then
        player.gui.center['difficulty_poll'].destroy()
        return
    end
    if game.tick > this.difficulty_poll_closing_timeout then
        if player.online_time ~= 0 then
            local t = math.abs(math.floor((this.difficulty_poll_closing_timeout - game.tick) / 3600))
            local str = 'Votes have closed ' .. t
            str = str .. ' minute'
            if t > 1 then
                str = str .. 's'
            end
            str = str .. ' ago.'
            player.print(str)
        end
        return
    end

    local frame =
        player.gui.center.add {
        type = 'frame',
        caption = 'Vote difficulty:',
        name = 'difficulty_poll',
        direction = 'vertical'
    }
    for i = 1, #this.difficulties, 1 do
        local b = frame.add({type = 'button', name = tostring(i), caption = this.difficulties[i].name})
        b.style.font_color = this.difficulties[i].color
        b.style.font = 'heading-2'
        b.style.minimal_width = 160
        b.tooltip = this.tooltip[i]
        --[[ if this.difficulties[i].disabled then
            b.enabled = false
        end ]]
    end
    local b = frame.add({type = 'label', caption = '- - - - - - - - - - - - - - - - - -'})
    local b =
        frame.add(
        {
            type = 'button',
            name = 'close',
            caption = 'Close (' .. math.floor((this.difficulty_poll_closing_timeout - game.tick) / 3600) .. ' minutes left)'
        }
    )
    b.style.font_color = {r = 0.66, g = 0.0, b = 0.66}
    b.style.font = 'heading-3'
    b.style.minimal_width = 96
end

local function set_difficulty()
    local a = 0
    local vote_count = 0
    for _, d in pairs(this.difficulty_player_votes) do
        a = a + d
        vote_count = vote_count + 1
    end
    if vote_count == 0 then
        return
    end
    a = a / vote_count
    local new_index = math.round(a, 0)
    if this.difficulty_vote_index ~= new_index then
        local message = table.concat({'>> Map difficulty has changed to ', this.difficulties[new_index].name, ' difficulty!'})
        game.print(message, this.difficulties[new_index].print_color)
        Server.to_discord_embed(message)
    end
    this.difficulty_vote_index = new_index
    this.difficulty_vote_value = this.difficulties[new_index].value
    this.name = this.difficulties[new_index].name
    this.print_color = this.difficulties[new_index].print_color
end

function Public.reset_difficulty_poll(tbl)
    if tbl then
        this.difficulty_vote_value = tbl.difficulty_vote_value or 1
        this.difficulty_vote_index = tbl.difficulty_vote_index or 1
        this.difficulty_player_votes = {}
        this.difficulty_poll_closing_timeout = tbl.difficulty_poll_closing_timeout or game.tick + 54000
        for _, p in pairs(game.connected_players) do
            if p.gui.center['difficulty_poll'] then
                p.gui.center['difficulty_poll'].destroy()
            end
            poll_difficulty(p)
        end
        Public.difficulty_gui()
    else
        this.difficulty_vote_value = 1
        this.difficulty_vote_index = 1
        this.name = 'Easy'
        this.print_color = {r = 0.00, g = 0.4, b = 0.00}
        this.difficulty_player_votes = {}
        this.difficulty_poll_closing_timeout = game.tick + 54000
        for _, p in pairs(game.connected_players) do
            if p.gui.center['difficulty_poll'] then
                p.gui.center['difficulty_poll'].destroy()
            end
            poll_difficulty(p)
        end
        Public.difficulty_gui()
    end
end

local function on_player_joined_game(event)
    local player = game.players[event.player_index]
    if game.tick < this.difficulty_poll_closing_timeout then
        if not this.difficulty_player_votes[player.name] then
            poll_difficulty(player)
        end
    else
        if player.gui.center['difficulty_poll'] then
            player.gui.center['difficulty_poll'].destroy()
        end
    end
    Public.difficulty_gui()
end

local function on_player_left_game(event)
    if game.tick > this.difficulty_poll_closing_timeout then
        return
    end
    local player = game.players[event.player_index]
    if not this.difficulty_player_votes[player.name] then
        return
    end
    this.difficulty_player_votes[player.name] = nil
    set_difficulty()
    Public.difficulty_gui()
end

local function on_gui_click(event)
    if not event then
        return
    end
    if not event.element then
        return
    end
    if not event.element.valid then
        return
    end
    local player = game.players[event.element.player_index]
    if event.element.name == 'difficulty_gui' then
        poll_difficulty(player)
        return
    end
    if event.element.type ~= 'button' then
        return
    end
    if event.element.parent.name ~= 'difficulty_poll' then
        return
    end
    if event.element.name == 'close' then
        event.element.parent.destroy()
        return
    end
    if game.tick > this.difficulty_poll_closing_timeout then
        event.element.parent.destroy()
        return
    end
    local i = tonumber(event.element.name)
    game.print(player.name .. ' has voted for ' .. this.difficulties[i].name .. ' difficulty!', this.difficulties[i].print_color)
    this.difficulty_player_votes[player.name] = i
    set_difficulty()
    Public.difficulty_gui()
    event.element.parent.destroy()
end

Event.add(defines.events.on_player_joined_game, on_player_joined_game)
Event.add(defines.events.on_player_left_game, on_player_left_game)
Event.add(defines.events.on_gui_click, on_gui_click)

return Public