<?php

namespace App\Lib\Helpers;

use Carbon\Carbon;
use Illuminate\Support\Facades\Log;

/**
 * Helper class for managing game periods and states.
 *
 * This class provides utility methods to determine the current state
 * of the game based on configured date periods. It handles the following periods:
 * - Start game    : between game start and vote start
 * - Vote          : between vote start and vote end
 * - End participation : between end participation start and end
 * - End game      : between end game start and end
 * - Closed        : outside all periods or invalid config
 *
 * Dates are retrieved from the 'goldencrush' config file.
 */
class GamePeriodHelper
{
    /**
     * Returns the game start date.
     */
    public static function startGameAt(): Carbon
    {
        return Carbon::parse(config('goldencrush.start_game_at'))->startOfDay();
    }

    /**
     * Returns the vote start date.
     */
    public static function voteStartAt(): Carbon
    {
        return Carbon::parse(config('goldencrush.vote_start_at'))->startOfDay();
    }

    /**
     * Returns the vote end date.
     */
    public static function voteEndAt(): Carbon
    {
        return Carbon::parse(config('goldencrush.vote_end_at'))->endOfDay();
    }

    /**
     * Returns the start date of the end participation period.
     * (day after the vote end date)
     */
    public static function endParticipationStartAt(): Carbon
    {
        return self::voteEndAt()->copy()->addDay()->startOfDay();
    }

    /**
     * Returns the end date of the end participation period.
     */
    public static function endParticipationEndAt(): Carbon
    {
        return Carbon::parse(config('goldencrush.end_participation_end_at'))->endOfDay();
    }

    /**
     * Returns the start date of the end game period.
     * (day after the end participation end date)
     */
    public static function endGameStartAt(): Carbon
    {
        return self::endParticipationEndAt()->copy()->addDay()->startOfDay();
    }

    /**
     * Returns the end date of the game.
     */
    public static function endGameEndAt(): Carbon
    {
        return Carbon::parse(config('goldencrush.end_game_end_at'))->endOfDay();
    }

    /**
     * Checks if the configured periods are valid.
     * Validates that the vote start date is before or equal to the vote end date
     * and the end game end date.
     */
    public static function hasValidPeriods(): bool
    {
        return self::voteStartAt()->lte(self::voteEndAt())
            && self::voteStartAt()->lte(self::endGameEndAt());
    }

    /**
     * Returns the current game state based on today's date.
     *
     * Possible states:
     * - 'start_game'        : between game start and vote start
     * - 'vote'              : between vote start and vote end
     * - 'end_participation' : between end participation start and end
     * - 'end_game'          : between end game start and end
     * - 'closed'            : outside all periods or invalid config
     */
    public static function state(): string
    {

        if (! self::hasValidPeriods()) {
            Log::error('Config des dates invalide ! ');

            return 'closed';
        }

        $today = now();

        if ($today->betweenIncluded(self::startGameAt(), self::voteStartAt())) {
            return 'start_game';
        }

        if ($today->betweenIncluded(self::voteStartAt(), self::voteEndAt())) {
            return 'vote';
        }

        if ($today->betweenIncluded(self::endParticipationStartAt(), self::endParticipationEndAt())) {
            return 'end_participation';
        }

        if ($today->betweenIncluded(self::endGameStartAt(), self::endGameEndAt())) {
            return 'end_game';
        }

        return 'closed';
    }

    /**
     * Returns the route name corresponding to the current game state.
     */
    public static function routeName(): string
    {
        return match (self::state()) {
            'vote'              => 'club.golden-crush',
            'end_participation' => 'club.golden-crush.end-of-participation',
            'end_game'          => 'club.golden-crush.end-of-game',
            default             => 'club.home.show',
        };
    }

    /**
     * Checks if today is within the active game period.
     * (between vote start and end game end)
     */
    public static function isGamePeriod(): bool
    {
        return now()->between(
            self::voteStartAt(),
            self::endGameEndAt()
        );
    }

    /**
     * Checks if the game is currently visible to users.
     * Returns true if the state is 'start_game', 'vote', 'end_participation' or 'end_game'.
     */
    public static function isGameVisible(): bool
    {
        return in_array(self::state(), [
            'start_game',
            'vote',
            'end_participation',
            'end_game',
        ]);
    }
}