import { NextRequest, NextResponse } from 'next/server';
import { auth } from '@clerk/nextjs/server';
import { getDatabase } from '@/lib/database';
import { randomBytes } from 'crypto';

// GET - List user's fitness goals
export async function GET(req: NextRequest) {
    try {
        const { userId } = await auth();
        if (!userId) {
            return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
        }

        const { searchParams } = new URL(req.url);
        const targetUserId = searchParams.get('userId') || userId;
        const status = searchParams.get('status'); // active, completed, all

        const db = await getDatabase();

        // Fetch goals with optional status filter
        const goals = await db.getFitnessGoalsByUserId(
            targetUserId,
            status && status !== 'all' ? status : undefined
        );

        return NextResponse.json(goals);
    } catch (error) {
        console.error('Error fetching fitness goals:', error);
        return NextResponse.json(
            { error: 'Internal server error' },
            { status: 500 }
        );
    }
}

// POST - Create new fitness goal
export async function POST(req: NextRequest) {
    try {
        const { userId } = await auth();
        if (!userId) {
            return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
        }

        const body = await req.json();
        const {
            goalType,
            title,
            description,
            targetValue,
            currentValue,
            unit,
            targetDate,
            priority,
            notes,
            fitnessProfileId
        } = body;

        // Validation
        if (!goalType || !title) {
            return NextResponse.json(
                { error: 'goalType and title are required' },
                { status: 400 }
            );
        }

        const db = await getDatabase();

        // Create the goal
        const goal = await db.createFitnessGoal({
            id: randomBytes(16).toString('hex'),
            userId,
            fitnessProfileId: fitnessProfileId || undefined,
            goalType,
            title,
            description: description || undefined,
            targetValue: targetValue || undefined,
            currentValue: currentValue || 0,
            unit: unit || undefined,
            startDate: new Date(),
            targetDate: targetDate ? new Date(targetDate) : undefined,
            status: 'active',
            progress: 0,
            priority: priority || 'medium',
            notes: notes || undefined
        });

        return NextResponse.json(goal, { status: 201 });
    } catch (error) {
        console.error('Error creating fitness goal:', error);
        return NextResponse.json(
            { error: 'Internal server error' },
            { status: 500 }
        );
    }
}