<?php

namespace App\Controllers\Api;

use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use App\Models\Game;
use App\Controllers\Api\BaseApiController;

class GameController extends BaseApiController
{
    /**
     * Get all games grouped by completion status
     */
    public function index(Request $request, Response $response, array $args): Response
    {
        $queryParams = $request->getQueryParams();
        $search = $queryParams['search'] ?? '';
        $sort = $queryParams['sort'] ?? 'title_asc';
        
        try {
            // Get games from database
            $games = $this->getAllGamesWithCategories($search, $sort);
            
            // Group games by completion status
            $groupedGames = $this->groupGamesByCategory($games);
            
            return $this->json($response, [
                'success' => true,
                'data' => $groupedGames
            ]);
        } catch (\Exception $e) {
            return $this->json($response, [
                'success' => false,
                'message' => 'Failed to fetch games: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Get game by ID
     */
    public function show(Request $request, Response $response, array $args): Response
    {
        $gameId = $args['id'] ?? null;
        
        if (!$gameId) {
            return $this->json($response, [
                'success' => false,
                'message' => 'Game ID is required'
            ], 400);
        }

        try {
            $game = $this->getGameDetails($gameId);
            
            if (!$game) {
                return $this->json($response, [
                    'success' => false,
                    'message' => 'Game not found'
                ], 404);
            }

            return $this->json($response, [
                'success' => true,
                'data' => $game
            ]);
        } catch (\Exception $e) {
            return $this->json($response, [
                'success' => false,
                'message' => 'Failed to fetch game: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Get games by category (BEATEN, PLAYING, etc.)
     */
    public function getByCategory(Request $request, Response $response, array $args): Response
    {
        $category = strtoupper($args['category'] ?? '');
        $queryParams = $request->getQueryParams();
        $search = $queryParams['search'] ?? '';
        $sort = $queryParams['sort'] ?? 'title_asc';
        
        if (!in_array($category, ['BEATEN', 'PLAYING', 'COMPLETED', 'UNPLAYED'])) {
            return $this->json($response, [
                'success' => false,
                'message' => 'Invalid category. Must be one of: BEATEN, PLAYING, COMPLETED, UNPLAYED'
            ], 400);
        }

        try {
            $games = $this->getGamesByCategory($category, $search, $sort);
            
            return $this->json($response, [
                'success' => true,
                'data' => [
                    'category' => $category,
                    'games' => $games,
                    'count' => count($games)
                ]
            ]);
        } catch (\Exception $e) {
            return $this->json($response, [
                'success' => false,
                'message' => 'Failed to fetch games by category: ' . $e->getMessage()
            ], 500);
        }
    }

    /**
     * Get all games from database
     */
    private function getAllGamesWithCategories(string $search = '', string $sort = 'title_asc'): array
    {
        $pdo = $this->getPdo();
        
        $sql = "
            SELECT 
                g.id,
                g.title,
                g.poster_url,
                g.backdrop_url,
                g.rating,
                g.release_date,
                g.platform,
                g.developer,
                g.genres,
                g.playtime_hours,
                g.completion_status,
                g.last_played,
                g.community_score,
                g.critic_score,
                g.source_name
            FROM games g
            WHERE 1=1
        ";

        $params = [];

        // Add search filter
        if (!empty($search)) {
            $sql .= " AND (g.title LIKE :search OR g.developer LIKE :search)";
            $params[':search'] = '%' . $search . '%';
        }

        // Add sorting
        switch ($sort) {
            case 'title_desc':
                $sql .= " ORDER BY g.title DESC";
                break;
            case 'year_asc':
                $sql .= " ORDER BY g.release_date ASC";
                break;
            case 'year_desc':
                $sql .= " ORDER BY g.release_date DESC";
                break;
            case 'playtime_desc':
                $sql .= " ORDER BY g.playtime_hours DESC";
                break;
            case 'rating_desc':
                $sql .= " ORDER BY g.rating DESC";
                break;
            case 'last_played_desc':
                $sql .= " ORDER BY g.last_played DESC";
                break;
            default:
                $sql .= " ORDER BY g.title ASC";
        }

        $stmt = $pdo->prepare($sql);
        $stmt->execute($params);
        
        $games = [];
        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
            // Parse genres if stored as JSON
            if (!empty($row['genres'])) {
                $genres = json_decode($row['genres'], true);
                $row['genres'] = is_array($genres) ? $genres : [];
            } else {
                $row['genres'] = [];
            }
            
            // Set default completion status
            if (empty($row['completion_status'])) {
                $row['completion_status'] = 'UNPLAYED';
            }
            
            $games[] = $row;
        }

        return $games;
    }

    /**
     * Group games by completion status
     */
    private function groupGamesByCategory(array $games): array
    {
        $categories = [
            'BEATEN' => ['name' => 'BEATEN', 'count' => 0, 'games' => []],
            'PLAYING' => ['name' => 'PLAYING', 'count' => 0, 'games' => []],
            'COMPLETED' => ['name' => 'COMPLETED', 'count' => 0, 'games' => []],
            'UNPLAYED' => ['name' => 'UNPLAYED', 'count' => 0, 'games' => []]
        ];

        foreach ($games as $game) {
            $status = $game['completion_status'] ?? 'UNPLAYED';
            if (isset($categories[$status])) {
                $categories[$status]['games'][] = $game;
                $categories[$status]['count']++;
            }
        }

        return array_values($categories);
    }

    /**
     * Get games by specific category
     */
    private function getGamesByCategory(string $category, string $search = '', string $sort = 'title_asc'): array
    {
        $pdo = $this->getPdo();
        
        $sql = "
            SELECT 
                g.id,
                g.title,
                g.poster_url,
                g.backdrop_url,
                g.rating,
                g.release_date,
                g.platform,
                g.developer,
                g.genres,
                g.playtime_hours,
                g.completion_status,
                g.last_played,
                g.community_score,
                g.critic_score,
                g.source_name
            FROM games g
            WHERE g.completion_status = :category
        ";

        $params = [':category' => $category];

        // Add search filter
        if (!empty($search)) {
            $sql .= " AND (g.title LIKE :search OR g.developer LIKE :search)";
            $params[':search'] = '%' . $search . '%';
        }

        // Add sorting
        switch ($sort) {
            case 'title_desc':
                $sql .= " ORDER BY g.title DESC";
                break;
            case 'year_asc':
                $sql .= " ORDER BY g.release_date ASC";
                break;
            case 'year_desc':
                $sql .= " ORDER BY g.release_date DESC";
                break;
            case 'playtime_desc':
                $sql .= " ORDER BY g.playtime_hours DESC";
                break;
            case 'rating_desc':
                $sql .= " ORDER BY g.rating DESC";
                break;
            case 'last_played_desc':
                $sql .= " ORDER BY g.last_played DESC";
                break;
            default:
                $sql .= " ORDER BY g.title ASC";
        }

        $stmt = $pdo->prepare($sql);
        $stmt->execute($params);
        
        $games = [];
        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
            // Parse genres if stored as JSON
            if (!empty($row['genres'])) {
                $genres = json_decode($row['genres'], true);
                $row['genres'] = is_array($genres) ? $genres : [];
            } else {
                $row['genres'] = [];
            }
            
            $games[] = $row;
        }

        return $games;
    }

    /**
     * Get detailed game information
     */
    private function getGameDetails(int $gameId): ?array
    {
        $pdo = $this->getPdo();
        
        $sql = "
            SELECT 
                g.id,
                g.title,
                g.poster_url,
                g.backdrop_url,
                g.rating,
                g.release_date,
                g.platform,
                g.developer,
                g.publisher,
                g.genres,
                g.playtime_hours,
                g.completion_status,
                g.last_played,
                g.community_score,
                g.critic_score,
                g.source_name,
                g.description,
                g.gameplay,
                g.synopsis,
                g.age_ratings,
                g.version,
                g.time_to_beat,
                g.controls,
                g.pacing,
                g.perspective,
                g.series
            FROM games g
            WHERE g.id = :id
        ";

        $stmt = $pdo->prepare($sql);
        $stmt->execute([':id' => $gameId]);
        
        $game = $stmt->fetch(\PDO::FETCH_ASSOC);
        
        if (!$game) {
            return null;
        }

        // Parse JSON fields
        $jsonFields = ['genres', 'age_ratings'];
        foreach ($jsonFields as $field) {
            if (!empty($game[$field])) {
                $decoded = json_decode($game[$field], true);
                $game[$field] = is_array($decoded) ? $decoded : [];
            } else {
                $game[$field] = [];
            }
        }

        // Set default completion status
        if (empty($game['completion_status'])) {
            $game['completion_status'] = 'UNPLAYED';
        }

        return $game;
    }
}