-- This file contains core utilities used by the redmew scenario.

-- Dependencies
local Game = require 'utils.game'
local Color = require 'resources.color_presets'
local Server = require 'features.server'

-- localized functions
local random = math.random
local sqrt = math.sqrt
local floor = math.floor
local format = string.format
local match = string.match
local insert = table.insert
local concat = table.concat

-- local constants
local prefix = '## - '
local seconds_to_ticks = 60
local minutes_to_ticks = 60 * 60
local hours_to_ticks = 60 * 60 * 60
local ticks_to_seconds = 1 / seconds_to_ticks
local ticks_to_minutes = 1 / minutes_to_ticks
local ticks_to_hours = 1 / hours_to_ticks

-- local vars
local Module = {}

--- Measures distance between pos1 and pos2
function Module.distance(pos1, pos2)
    local dx = pos2.x - pos1.x
    local dy = pos2.y - pos1.y
    return sqrt(dx * dx + dy * dy)
end

--- Takes msg and prints it to all players except provided player
-- @param msg <string|table> table if locale is used
-- @param player <LuaPlayer> the player not to send the message to
-- @param color <table> the color to use for the message, defaults to white
function Module.print_except(msg, player, color)
    if not color then
        color = Color.white
    end

    for _, p in pairs(game.connected_players) do
        if p ~= player then
            p.print(msg, {color = color})
        end
    end
end

--- Prints a message to all online admins
-- @param msg <string|table> table if locale is used
-- @param source <LuaPlayer|string|nil> string must be the name of a player, nil for server.
-- @param no_log <boolean|nil> if true, skips logging the message
function Module.print_admins(msg, source, no_log)
    local source_name
    local chat_color
    if source then
        if type(source) == 'string' then
            source_name = source
            chat_color = game.get_player(source).chat_color
        else
            source_name = source.name
            chat_color = source.chat_color
        end
    else
        source_name = 'Server'
        chat_color = Color.yellow
    end
    local formatted_msg = {'utils_core.print_admins', prefix, source_name, msg}
    if not no_log then
        log(formatted_msg)
    end
    for _, p in pairs(game.connected_players) do
        if p.admin then
            p.print(formatted_msg, {color = chat_color})
        end
    end
end

--- Returns a valid string with the name of the actor of a command.
function Module.get_actor()
    if game.player then
        return game.player.name
    end
    return '<server>'
end

--- Returns a valid string with the name of the actor for a player_index if they are an admin or the server.
function Module.get_admin_or_server_actor(player_index)
    if not player_index then
        return '<server>'
    end

    local player = game.get_player(player_index)
    if player.valid and player.admin then
        return player.name
    end

    return nil
end

function Module.cast_bool(var)
    if var then
        return true
    else
        return false
    end
end

function Module.find_entities_by_last_user(player, surface, filters)
    if type(player) == 'string' or not player then
        error(
            "bad argument #1 to '" ..
                debug.getinfo(1, 'n').name .. "' (number or LuaPlayer expected, got " .. type(player) .. ')',
            1
        )
        return
    end
    if type(surface) ~= 'userdata' and type(surface) ~= 'number' then
        error(
            "bad argument #2 to '" ..
                debug.getinfo(1, 'n').name .. "' (number or LuaSurface expected, got " .. type(surface) .. ')',
            1
        )
        return
    end
    local entities = {}
    local filter = filters or {}
    if type(surface) == 'number' then
        surface = game.surfaces[surface]
    end
    if type(player) == 'number' then
        player = game.get_player(player)
    end
    filter.force = player.force.name
    for _, e in pairs(surface.find_entities_filtered(filter)) do
        if e.last_user == player then
            insert(entities, e)
        end
    end
    return entities
end

function Module.ternary(c, t, f)
    if c then
        return t
    else
        return f
    end
end

--- Takes a time in ticks and returns a string with the time in format "x hour(s) x minute(s)"
function Module.format_time(ticks, include_seconds)
    local result = {}

    local hours = floor(ticks * ticks_to_hours)
    local has_previous = false
    if hours > 0 then
        has_previous = true
        ticks = ticks - hours * hours_to_ticks
        insert(result, hours)
        if hours == 1 then
            insert(result, 'hour')
        else
            insert(result, 'hours')
        end
    end

    local minutes = floor(ticks * ticks_to_minutes)
    if minutes > 0 or (not include_seconds and not has_previous) then
        has_previous = true
        ticks = ticks - minutes * minutes_to_ticks
        insert(result, minutes)
        if minutes == 1 then
            insert(result, 'minute')
        else
            insert(result, 'minutes')
        end
    end

    if include_seconds then
        local seconds = floor(ticks * ticks_to_seconds)
        if seconds > 0 or not has_previous then
            insert(result, seconds)
            if seconds == 1 then
                insert(result, 'second')
            else
                insert(result, 'seconds')
            end
        end
    end

    return concat(result, ' ')
end

--- Prints a message letting the player know they cannot run a command
-- @param name string name of the command
function Module.cant_run(name)
    Game.player_print("Can't run command (" .. name .. ') - insufficient permission.')
end

--- Logs the use of a command and its user
-- @param actor string with the actor's name (usually acquired by calling get_actor)
-- @param command the command's name as table element
-- @param parameters the command's parameters as a table (optional)
function Module.log_command(actor, command, parameters)
    local action = concat {'[Admin-Command] ', actor, ' used: ', command}
    if parameters then
        action = concat {action, ' ', parameters}
    end
    log(action)
end

function Module.comma_value(n) -- credit http://richard.warburton.it
    local left, num, right = match(n, '^([^%d]*%d)(%d*)(.-)$')
    return left .. (num:reverse():gsub('(%d%d%d)', '%1,'):reverse()) .. right
end

--- Asserts the argument is one of type arg_types
-- @param arg the variable to check
-- @param arg_types the type as a table of sings
-- @return boolean
function Module.verify_mult_types(arg, arg_types)
    for _, arg_type in pairs(arg_types) do
        if type(arg) == arg_type then
            return true
        end
    end
    return false
end

--- Returns a random RGB color as a table
function Module.random_RGB()
    return {r = random(0, 255), g = random(0, 255), b = random(0, 255)}
end

--- Sets a table element to value while also returning value.
-- @param tbl table to change the element of
-- @param key string
-- @param value nil|boolean|number|string|table to set the element to
-- @return value
function Module.set_and_return(tbl, key, value)
    tbl[key] = value
    return value
end

--- Takes msg and prints it to all players. Also prints to the log and discord
-- @param msg <string> The message to print
-- @param warning_prefix <string> The name of the module/warning
function Module.action_warning(warning_prefix, msg)
    game.print(prefix .. msg, {color = Color.yellow})
    msg = format('%s %s', warning_prefix, msg)
    log(msg)
    Server.to_discord_bold(msg)
end

--- Takes msg and prints it to all players except provided player. Also prints to the log and discord
-- @param msg <string> The message to print
-- @param warning_prefix <string> The name of the module/warning
-- @param player <LuaPlayer> the player not to send the message to
function Module.silent_action_warning(warning_prefix, msg, player)
    Module.print_except(prefix .. msg, player, Color.yellow)
    msg = format('%s %s', warning_prefix, msg)
    log(msg)
    Server.to_discord_bold(msg)
end

--- Takes a string, number, or LuaPlayer and returns a valid LuaPlayer or nil.
-- Intended for commands as there are extra checks in place.
-- @param <string|number|LuaPlayer>
-- @return <LuaPlayer|nil> <string|nil> <number|nil> the LuaPlayer, their name, and their index
function Module.validate_player(player_ident)
    local data_type = type(player_ident)
    local player

    if data_type == 'userdata' and player_ident.valid then
        local is_player = player_ident.is_player()
        if is_player then
            player = player_ident
        end
    elseif data_type == 'number' or data_type == 'string' then
        player = game.get_player(player_ident)
    else
        return
    end

    if not player or not player.valid then
        return
    end

    return player, player.name, player.index
end

local non_breaking_space = '​' -- This is \u200B an invisible space charcater.
local sensitive_characters_map = {
    ['\\'] = '\\\\',
    ['*'] = '\\*',
    ['_'] = '\\_',
    ['~'] = '\\~',
    ['`'] = '\\`',
    ['|'] = '\\|',
    ['>'] = '\\>',
    ['@'] = '@' .. non_breaking_space
}

--- Escapes markdown characters mentions. Intended to make it safe to send user input to discord.
-- @param message <string>
-- @return <string>
function Module.sanitise_string_for_discord(message)
    for character, replace in pairs(sensitive_characters_map) do
        message = string.gsub(message, character, replace)
    end

    return message
end

-- add utility functions that exist in base factorio/util
require 'util'

--- Moves a position according to the parameters given
-- Notice: only accepts cardinal directions as direction
-- @param position <table> table containing a map position
-- @param direction <defines.direction> north, east, south, west
-- @param distance <number>
-- @return <table> modified position
Module.move_position = util.moveposition

--- Takes a direction and gives you the opposite
-- @param direction <defines.direction> north, east, south, west, northeast, northwest, southeast, southwest
-- @return <number> representing the direction
Module.opposite_direction = util.oppositedirection

--- Takes the string of a module and returns whether is it available or not
-- @param name <string> the name of the module (ex. 'utils.core')
-- @return <boolean>
Module.is_module_available = util.ismoduleavailable

return Module
