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

// GET - Get specific goal
export async function GET(
    req: NextRequest,
    { params }: { params: { id: string } }
) {
    try {
        const { userId } = await auth();
        if (!userId) {
            return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
        }

        const { id } = await params;
        const db = await getDatabase();

        const goal = await db.getFitnessGoalById(id);

        if (!goal) {
            return NextResponse.json({ error: 'Goal not found' }, { status: 404 });
        }

        // Verify ownership
        if (goal.userId !== userId) {
            return NextResponse.json({ error: 'Forbidden' }, { status: 403 });
        }

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

// PUT - Update goal
export async function PUT(
    req: NextRequest,
    { params }: { params: { id: string } }
) {
    try {
        const { userId } = await auth();
        if (!userId) {
            return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
        }

        const { id } = await params;
        const db = await getDatabase();

        // Verify goal exists and user owns it
        const existingGoal = await db.getFitnessGoalById(id);
        if (!existingGoal) {
            return NextResponse.json({ error: 'Goal not found' }, { status: 404 });
        }
        if (existingGoal.userId !== userId) {
            return NextResponse.json({ error: 'Forbidden' }, { status: 403 });
        }

        const updates = await req.json();

        // Don't allow changing userId or id
        delete updates.userId;
        delete updates.id;
        delete updates.createdAt;

        const updatedGoal = await db.updateFitnessGoal(id, updates);

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

// DELETE - Delete goal
export async function DELETE(
    req: NextRequest,
    { params }: { params: { id: string } }
) {
    try {
        const { userId } = await auth();
        if (!userId) {
            return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
        }

        const { id } = await params;
        const db = await getDatabase();

        // Verify goal exists and user owns it
        const existingGoal = await db.getFitnessGoalById(id);
        if (!existingGoal) {
            return NextResponse.json({ error: 'Goal not found' }, { status: 404 });
        }
        if (existingGoal.userId !== userId) {
            return NextResponse.json({ error: 'Forbidden' }, { status: 403 });
        }

        const deleted = await db.deleteFitnessGoal(id);

        if (deleted) {
            return NextResponse.json({ success: true });
        } else {
            return NextResponse.json({ error: 'Failed to delete goal' }, { status: 500 });
        }
    } catch (error) {
        console.error('Error deleting fitness goal:', error);
        return NextResponse.json(
            { error: 'Internal server error' },
            { status: 500 }
        );
    }
}