local CONST = require 'config.const'

local M = {}

local STATE = {
    PREPARE  = 'prepare',
    PLAYING  = 'playing',
    OVERTIME = 'overtime',
    ENDED    = 'ended',
}

local current_state = nil

function M.init()
    M.switch_state(STATE.PREPARE)
end

function M.switch_state(new_state)
    current_state = new_state

    if new_state == STATE.PREPARE then
        M.on_prepare()
    elseif new_state == STATE.PLAYING then
        M.on_playing()
    elseif new_state == STATE.OVERTIME then
        M.on_overtime()
    elseif new_state == STATE.ENDED then
        M.on_ended()
    end
end

function M.get_state()
    return current_state
end

-- ---------------------------------------------------------
-- PREPARE：10秒准备期，玩家不可攻击
-- ---------------------------------------------------------
function M.on_prepare()
    local NpcMgr      = require 'core.npc_manager'
    local PlayerMgr   = require 'core.player_manager'
    local ItemSpawner = require 'systems.item_spawner'
    local ModeMgr     = require 'core.mode_manager'
    local Suspicion   = require 'systems.suspicion'
    local Corpse      = require 'systems.corpse'

    NpcMgr.init()
    PlayerMgr.init_all_players()
    ItemSpawner.init()
    ModeMgr.init()
    Suspicion.start()
    Corpse.start_discovery_scan()

    for _, pd in ipairs(PlayerMgr.get_all_player_units()) do
        pd.unit:add_state(CONST.STATE_INVINCIBLE)
    end

    clicli.timer.wait(10.0, function()
        local PlayerMgr2 = require 'core.player_manager'
        for _, pd in ipairs(PlayerMgr2.get_all_player_units()) do
            pd.unit:remove_state(CONST.STATE_INVINCIBLE)
        end
        M.switch_state(STATE.PLAYING)
    end)
end

-- ---------------------------------------------------------
-- PLAYING：正常阶段
-- ---------------------------------------------------------
function M.on_playing()
    local Circle = require 'systems.circle'

    local total      = CONST.MATCH_DURATION
    local overtime_at = total - 60

    Circle.start()

    clicli.timer.wait(overtime_at, function()
        M.switch_state(STATE.OVERTIME)
    end)
end

-- ---------------------------------------------------------
-- OVERTIME：紧迫期，怀疑值增速×2，NPC减少30%
-- ---------------------------------------------------------
function M.on_overtime()
    local Suspicion = require 'systems.suspicion'
    local NpcMgr    = require 'core.npc_manager'

    Suspicion.set_multiplier(2.0)
    NpcMgr.reduce_npc_count(0.3)

    clicli.timer.wait(60.0, function()
        M.switch_state(STATE.ENDED)
    end)
end

-- ---------------------------------------------------------
-- ENDED：结算
-- ---------------------------------------------------------
function M.on_ended()
    local Suspicion = require 'systems.suspicion'
    local Circle    = require 'systems.circle'
    local PlayerMgr = require 'core.player_manager'

    Suspicion.stop()
    Circle.stop()

    local rankings = PlayerMgr.get_rankings()
    for _, pd in ipairs(rankings) do
        clicli.game.end_player_game(pd.player, pd.rank == 1 and '胜利' or '失败', true)
    end
end

return M