/**
 * Player Storage API
 * 
 * Handles loading and saving player game states from/to the backend.
 * This enables cross-domain synchronization between hoerdle.de and hördle.de.
 */

import { getOrCreatePlayerId } from './playerId';
import type { GameState, Statistics } from './gameState';

/**
 * Get genre key for storage
 * 
 * Formats the genre/special into a consistent key format:
 * - Global: "global"
 * - Genre: "Rock" (localized name)
 * - Special: "special:00725" (special name)
 */
export function getGenreKey(
    genre: string | null,
    isSpecial: boolean,
    specialName?: string
): string {
    if (isSpecial && specialName) {
        return `special:${specialName}`;
    }
    return genre || 'global';
}

/**
 * Load player state from backend
 * 
 * @param genreKey - Genre key (from getGenreKey)
 * @returns GameState and Statistics, or null if not found
 */
export async function loadPlayerState(
    genreKey: string
): Promise<{ gameState: GameState; statistics: Statistics } | null> {
    try {
        // Use async version to enable cross-domain player ID sync
        const { getOrCreatePlayerIdAsync } = await import('./playerId');
        const playerId = await getOrCreatePlayerIdAsync(genreKey);
        if (!playerId) {
            return null;
        }

        // Determine if it's a special or genre
        const isSpecial = genreKey.startsWith('special:');
        const params = new URLSearchParams();
        
        if (isSpecial) {
            const specialName = genreKey.replace('special:', '');
            params.append('special', specialName);
        } else if (genreKey !== 'global') {
            params.append('genre', genreKey);
        }

        const response = await fetch(`/api/player-state?${params.toString()}`, {
            method: 'GET',
            headers: {
                'X-Player-Id': playerId,
            },
        });

        if (!response.ok) {
            if (response.status === 404) {
                // No state found - this is normal for new players
                return null;
            }
            // Other errors: log and return null (will fallback to localStorage)
            console.warn('[playerStorage] Failed to load player state:', response.status);
            return null;
        }

        const data = await response.json();
        if (!data || !data.gameState || !data.statistics) {
            return null;
        }

        return {
            gameState: data.gameState as GameState,
            statistics: data.statistics as Statistics,
        };
    } catch (error) {
        // Network errors or other issues: fallback to localStorage
        console.warn('[playerStorage] Error loading player state:', error);
        return null;
    }
}

/**
 * Save player state to backend
 * 
 * @param genreKey - Genre key (from getGenreKey)
 * @param gameState - Current game state
 * @param statistics - Current statistics
 */
export async function savePlayerState(
    genreKey: string,
    gameState: GameState,
    statistics: Statistics
): Promise<void> {
    try {
        // Use async version to ensure device ID is included
        const { getOrCreatePlayerIdAsync } = await import('./playerId');
        const playerId = await getOrCreatePlayerIdAsync();
        if (!playerId) {
            console.warn('[playerStorage] No player ID available, cannot save state');
            return;
        }

        const response = await fetch('/api/player-state', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'X-Player-Id': playerId,
            },
            body: JSON.stringify({
                genreKey,
                gameState,
                statistics,
            }),
        });

        if (!response.ok) {
            console.warn('[playerStorage] Failed to save player state:', response.status);
            // Don't throw - allow fallback to localStorage
        }
    } catch (error) {
        // Network errors: log but don't throw (will fallback to localStorage)
        console.warn('[playerStorage] Error saving player state:', error);
    }
}