import { NextResponse } from 'next/server';
import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

/**
 * POST /api/player-id/suggest
 * 
 * Tries to find a base player ID based on recently updated states for a genre and device.
 * This helps synchronize player IDs across different domains (hoerdle.de and hördle.de)
 * on the same device.
 * 
 * Request body:
 * - genreKey: Genre key (e.g., "global", "Rock", "special:00725")
 * - deviceId: Device identifier (UUID)
 * 
 * Returns:
 * - basePlayerId: Suggested base player ID (UUID) if found, null otherwise
 */
export async function POST(request: Request) {
    try {
        const body = await request.json();
        const { genreKey, deviceId } = body;

        if (!genreKey || typeof genreKey !== 'string') {
            return NextResponse.json(
                { error: 'Missing or invalid genreKey' },
                { status: 400 }
            );
        }

        // Find the most recently updated player state for this genre
        // Look for states updated in the last 48 hours
        const cutoffDate = new Date();
        cutoffDate.setHours(cutoffDate.getHours() - 48);

        // If deviceId is provided, search for states with matching device ID
        // Format: {basePlayerId}:{deviceId}
        if (deviceId && typeof deviceId === 'string') {
            // Search for states with the same device ID
            const recentStates = await prisma.playerState.findMany({
                where: {
                    genreKey: genreKey,
                    lastPlayed: {
                        gte: cutoffDate,
                    },
                    identifier: {
                        endsWith: `:${deviceId}`,
                    },
                },
                orderBy: {
                    lastPlayed: 'desc',
                },
                take: 1,
            });

            if (recentStates.length > 0) {
                const recentState = recentStates[0];
                // Extract base player ID from full identifier
                const colonIndex = recentState.identifier.indexOf(':');
                if (colonIndex !== -1) {
                    const basePlayerId = recentState.identifier.substring(0, colonIndex);
                    return NextResponse.json({
                        basePlayerId: basePlayerId,
                        lastPlayed: recentState.lastPlayed,
                    });
                }
            }
        }

        // Fallback: Find any recent state for this genre (legacy support)
        const recentState = await prisma.playerState.findFirst({
            where: {
                genreKey: genreKey,
                lastPlayed: {
                    gte: cutoffDate,
                },
            },
            orderBy: {
                lastPlayed: 'desc',
            },
        });

        if (recentState) {
            // Extract base player ID if format is basePlayerId:deviceId
            const colonIndex = recentState.identifier.indexOf(':');
            if (colonIndex !== -1) {
                const basePlayerId = recentState.identifier.substring(0, colonIndex);
                return NextResponse.json({
                    basePlayerId: basePlayerId,
                    lastPlayed: recentState.lastPlayed,
                });
            } else {
                // Legacy format: return as-is
                return NextResponse.json({
                    basePlayerId: recentState.identifier,
                    lastPlayed: recentState.lastPlayed,
                });
            }
        }

        // No recent state found
        return NextResponse.json({
            basePlayerId: null,
        });
    } catch (error) {
        console.error('[player-id/suggest] Error finding player ID:', error);
        return NextResponse.json(
            { error: 'Internal Server Error' },
            { status: 500 }
        );
    }
}