local Command = require 'utils.command'
local Rank = require 'features.rank_system'
local Task = require 'utils.task'
local Token = require 'utils.token'
local Server = require 'features.server'
local Popup = require 'features.gui.popup'
local Global = require 'utils.global'
local Event = require 'utils.event'
local Retailer = require 'features.retailer'
local Ranks = require 'resources.ranks'
local Core = require 'utils.core'
local Color = require 'resources.color_presets'
local Toast = require 'features.gui.toast'
local Utils = require 'utils.core'
local Discord = require 'resources.discord'
local set_timeout_in_ticks = Task.set_timeout_in_ticks
local ScoreTracker = require 'utils.score_tracker'

local map_promotion_channel = Discord.channel_names.map_promotion
local crash_site_role_mention = Discord.role_mentions.crash_site

local Public = {}

function Public.control(config)

    local server_player = {name = '<server>', print = print}
    local global_data = {restarting = nil, start_epoch = nil}
    local airstrike_data = {radius_level = 1, count_level = 1}

    Global.register({global_data = global_data, airstrike_data = airstrike_data}, function(tbl)
        global_data = tbl.global_data
        airstrike_data = tbl.airstrike_data
    end)

    local function double_print(str)
        game.print(str)
        print(str)
    end

    local static_entities_to_check = {
        'spitter-spawner',
        'biter-spawner',
        'small-worm-turret',
        'medium-worm-turret',
        'big-worm-turret',
        'behemoth-worm-turret',
        'gun-turret',
        'laser-turret',
        'artillery-turret',
        'flamethrower-turret'
    }

    local biter_entities_to_check = {
        'small-spitter',
        'medium-spitter',
        'big-spitter',
        'behemoth-spitter',
        'small-biter',
        'medium-biter',
        'big-biter',
        'behemoth-biter'
    }

    local function count_enemy_entities()
        local get_entity_count = game.forces["enemy"].get_entity_count
        local entity_count = 0;
        for i = 1, #static_entities_to_check do
            local name = static_entities_to_check[i]
            entity_count = entity_count + get_entity_count(name)
        end
        for i = 1, #biter_entities_to_check do
            local name = biter_entities_to_check[i]
            entity_count = entity_count + get_entity_count(name)
        end
        return entity_count
    end

    local callback
    callback = Token.register(function(data)
        if not global_data.restarting then
            return
        end

        local state = data.state
        if state == 0 then
            Server.start_scenario(data.scenario_name)
            double_print('restarting')
            global_data.restarting = nil
            return
        elseif state == 1 then
            local time_string = Core.format_time(game.ticks_played)
            Server.to_discord_named_raw(map_promotion_channel, crash_site_role_mention
                .. ' **Crash Site has just restarted! Previous map lasted: ' .. time_string .. '!**')

            local end_epoch = Server.get_current_time()
            if end_epoch == nil then
                end_epoch = -1 -- end_epoch is nil if the restart command is used locally rather than on the server
            end

            local statistics = {
                start_epoch = global_data.start_epoch,
                end_epoch = end_epoch, -- stored as key already, useful to have it as part of same structure
                game_ticks = game.ticks_played,
                enemy_entities = count_enemy_entities(),
                biters_killed = ScoreTracker.get_for_global('aliens-killed'),
                total_players = #game.players
            }
            Server.set_data('crash_site_data', tostring(end_epoch), statistics) -- Store the table, with end_epoch as the key
            Popup.all('\nServer restarting!\nInitiated by ' .. data.name .. '\n')
        end

        double_print(state)

        data.state = state - 1
        Task.set_timeout_in_ticks(60, callback, data)
    end)

    local function map_cleared(player)
        player = player or server_player
        local get_entity_count = game.forces["enemy"].get_entity_count
        -- Check how many of each turrets, worms and spawners are left and return false if there are any of each left.
        for i = 1, #static_entities_to_check do
            local name = static_entities_to_check[i]
            if get_entity_count(name) > 0 then
                player.print(
                    'All enemy spawners, worms, buildings, biters and spitters must be cleared before crashsite can be restarted.')
                return false
            end
        end

        -- Count all the remaining enemies
        local biter_total = count_enemy_entities()

        -- Return false if more than 20 left. Players have had problems finding the last few biters so set to a reasonable value.
        if biter_total > 20 then
            player.print(
                'All enemy spawners, worms, buildings are dead. Crashsite can be restarted when all biters and spitters are killed.')
            return false
        end
        return true
    end

    local function restart(args, player)
        player = player or server_player
        local sanitised_scenario = args.scenario_name

        if global_data.restarting then
            player.print('Restart already in progress')
            return
        end

        if player ~= server_player and Rank.less_than(player.name, Ranks.admin) then
            -- Check enemy count
            if not map_cleared(player) then
                return
            end

            -- Limit the ability of non-admins to call the restart function with arguments to change the scenario
            -- If not an admin, restart the same scenario always
            sanitised_scenario = config.scenario_name
        end

        global_data.restarting = true

        double_print('#################-Attention-#################')
        double_print('Server restart initiated by ' .. player.name)
        double_print('###########################################')

        for _, p in pairs(game.players) do
            if p.admin then
                p.print('Abort restart with /abort')
            end
        end
        print('Abort restart with /abort')
        Task.set_timeout_in_ticks(60, callback, {name = player.name, scenario_name = sanitised_scenario, state = 10})
    end

    local function abort(_, player)
        player = player or server_player

        if global_data.restarting then
            global_data.restarting = nil
            double_print('Restart aborted by ' .. player.name)
        else
            player.print('Cannot abort a restart that is not in progress.')
        end
    end

    local chart_area_callback = Token.register(function(data)
        local xpos = data.xpos
        local ypos = data.ypos
        local player = data.player
        local s = player.surface
        player.force.chart(s, {{xpos - 32, ypos - 32}, {xpos + 32, ypos + 32}})
    end)

    local function spy(args, player)
        local player_name = player.name
        local inv = player.get_inventory(defines.inventory.character_main)
        local coin_count = inv.get_item_count("coin")

        -- Parse the values from the location string
        -- {location = "[gps=-110,-17,redmew]"}
        local location_string = args.location
        local coords = {}

        for m in string.gmatch(location_string, "%-?%d+") do
            table.insert(coords, tonumber(m))
        end
        -- Do some checks then reveal the pinged map and remove 1000 coins
        if #coords < 2 then
            player.print({'command_description.crash_site_spy_invalid'}, Color.fail)
            return
        elseif coin_count < 1000 then
            player.print({'command_description.crash_site_spy_funds'}, Color.fail)
            return
        else
            local xpos = coords[1]
            local ypos = coords[2]
            -- reveal 3x3 chunks centred on chunk containing pinged location
            -- make sure it lasts 15 seconds
            for j = 1, 15 do
                set_timeout_in_ticks(60 * j, chart_area_callback, {player = player, xpos = xpos, ypos = ypos})
            end
            game.print({'command_description.crash_site_spy_success', player_name, xpos, ypos}, Color.success)
            inv.remove({name = "coin", count = 1000})
        end
    end

    local spawn_poison_callback = Token.register(function(data)
        local r = data.r
        data.s.create_entity {
            name = "poison-capsule",
            position = {0, 0},
            target = {data.xpos + math.random(-r, r), data.ypos + math.random(-r, r)},
            speed = 10,
            max_range = 100000
        }
    end)

    local function strike(args, player)
        local s = player.surface
        local location_string = args.location
        local coords = {}

        local radius_level = airstrike_data.radius_level -- max radius of the strike area
        local count_level = airstrike_data.count_level -- the number of poison capsules launched at the enemy
        if count_level == 1 then
            player.print({'command_description.crash_site_airstrike_not_researched'}, Color.fail)
            return
        end

        local radius = 5 + (radius_level * 3)
        local count = (count_level - 2) * 5 + 3
        local strikeCost = count * 4 -- the number of poison-capsules required in the chest as payment

        -- parse GPS coordinates from map ping
        for m in string.gmatch(location_string, "%-?%d+") do
            table.insert(coords, tonumber(m))
        end

        -- Do some checks on the coordinates passed in the argument
        if #coords < 2 then
            player.print({'command_description.crash_site_airstrike_invalid'}, Color.fail)
            return
        end
        local xpos = coords[1]
        local ypos = coords[2]

        -- Check that the chest is where it should be.
        local entities = s.find_entities_filtered {position = {-0.5, -3.5}, type = 'container', limit = 1}
        local dropbox = entities[1]

        if dropbox == nil then
            player.print("Chest not found. Replace it here: [gps=-0.5,-3.5,redmew]")
            return
        end

        -- Check the contents of the chest by spawn for enough poison capsules to use as payment
        local inv = dropbox.get_inventory(defines.inventory.chest)
        local capCount = inv.get_item_count("poison-capsule")

        if capCount < strikeCost then
            player.print(
                {'command_description.crash_site_airstrike_insufficient_currency_error', strikeCost - capCount},
                Color.fail)
            return
        end

        -- Do a simple check to make sure the player isn't trying to grief the base
        -- local enemyEntities = s.find_entities_filtered {position = {xpos, ypos}, radius = radius, force = "enemy"}
        local enemyEntities = player.surface.count_entities_filtered {
            position = {xpos, ypos},
            radius = radius + 30,
            force = "enemy",
            limit = 1
        }
        if enemyEntities < 1 then
            player.print({'command_description.crash_site_airstrike_friendly_fire_error'}, Color.fail)
            Utils.print_admins(player.name .. " tried to airstrike the base here: [gps=" .. xpos .. "," .. ypos
                                   .. ",redmew]", nil)
            return
        end

        inv.remove({name = "poison-capsule", count = strikeCost})
        game.print({'command_description.crash_site_airstrike_success', player.name, xpos, ypos})
        for j = 1, count do
            set_timeout_in_ticks(30 * j, spawn_poison_callback,
                {s = s, xpos = xpos, ypos = ypos, count = count, r = radius})
            set_timeout_in_ticks(60 * j, chart_area_callback, {player = player, xpos = xpos, ypos = ypos})
        end
    end

    Event.add(Server.events.on_server_started, function()
        if not global_data.start_epoch then
            global_data.start_epoch = Server.get_current_time()
        end
    end)

    Event.add(Retailer.events.on_market_purchase, function(event)

        local market_id = event.group_name
        local group_label = Retailer.get_market_group_label(market_id)
        if group_label ~= 'Spawn' then
            return
        end

        local item = event.item
        if item.type ~= 'airstrike' then
            return
        end

        -- airstrike stuff
        local radius_level = airstrike_data.radius_level -- max radius of the strike area
        local count_level = airstrike_data.count_level -- the number of poison capsules launched at the enemy
        local radius = 5 + (radius_level * 3)
        local count = (count_level - 1) * 5 + 3
        local strikeCost = count * 4

        local name = item.name
        if name == 'airstrike_damage' then
            airstrike_data.count_level = airstrike_data.count_level + 1

            Toast.toast_all_players(15, {'command_description.crash_site_airstrike_damage_upgrade_success', count_level})
            item.name_label = {'command_description.crash_site_airstrike_count_name_label', (count_level + 1)}
            item.price = math.floor(math.exp(airstrike_data.count_level ^ 0.8) / 2) * 1000
            item.description = {
                'command_description.crash_site_airstrike_count',
                (count_level + 1),
                count_level,
                count,
                tostring(strikeCost) .. ' poison capsules'
            }
            Retailer.set_item(market_id, item) -- this updates the retailer with the new item values.
        elseif name == 'airstrike_radius' then
            airstrike_data.radius_level = airstrike_data.radius_level + 1
            Toast.toast_all_players(15,
                {'command_description.crash_site_airstrike_radius_upgrade_success', radius_level})
            item.name_label = {'command_description.crash_site_airstrike_radius_name_label', (radius_level + 1)}
            item.description = {
                'command_description.crash_site_airstrike_radius',
                (radius_level + 1),
                radius_level,
                radius
            }
            item.price = math.floor(math.exp(airstrike_data.radius_level ^ 0.8) / 2) * 1000
            Retailer.set_item(market_id, item) -- this updates the retailer with the new item values.
        end
    end)

    Command.add('crash-site-restart-abort', {
        description = {'command_description.crash_site_restart_abort'},
        required_rank = Ranks.admin,
        allowed_by_server = true
    }, abort)

    Command.add('abort', {
        description = {'command_description.crash_site_restart_abort'},
        required_rank = Ranks.admin,
        allowed_by_server = true
    }, abort)

    local default_name = config.scenario_name or 'crashsite'
    Command.add('crash-site-restart', {
        description = {'command_description.crash_site_restart'},
        arguments = {'scenario_name'},
        default_values = {scenario_name = default_name},
        required_rank = Ranks.admin,
        allowed_by_server = true
    }, restart)

    Command.add('restart', {
        description = {'command_description.crash_site_restart'},
        arguments = {'scenario_name'},
        default_values = {scenario_name = default_name},
        required_rank = Ranks.guest,
        allowed_by_server = true
    }, restart)

    Command.add('spy', {
        description = {'command_description.crash_site_spy'},
        arguments = {'location'},
        capture_excess_arguments = true,
        required_rank = Ranks.guest,
        allowed_by_server = false
    }, spy)

    Command.add('strike', {
        description = {'command_description.strike'},
        arguments = {'location'},
        capture_excess_arguments = true,
        required_rank = Ranks.guest,
        allowed_by_server = false
    }, strike)
end

return Public