import { NextResponse } from 'next/server';
import fs from 'fs-extra';
import path from 'path';
import { BatchRenameResponse, RenameOperation, RenameResult } from '@/types';

export async function POST(request: Request) {
    try {
        const { albumPath, renames } = await request.json();

        if (!albumPath || !(await fs.pathExists(albumPath))) {
            return NextResponse.json({ error: 'Invalid album path' }, { status: 400 });
        }

        if (!renames || !Array.isArray(renames)) {
            return NextResponse.json({ error: 'Invalid renames list' }, { status: 400 });
        }

        const results: RenameResult[] = [];
        const errors: string[] = [];

        for (const { original, newName } of renames as RenameOperation[]) {
            try {
                const oldPath = path.join(albumPath, original);
                const newPath = path.join(albumPath, newName);

                if (await fs.pathExists(oldPath)) {
                    await fs.rename(oldPath, newPath);
                    results.push({ original, newName, success: true });
                } else {
                    errors.push(`File not found: ${original}`);
                }
            } catch (e) {
                const errorMessage = e instanceof Error ? e.message : String(e);
                errors.push(`Failed to rename ${original}: ${errorMessage}`);
            }
        }

        const response: BatchRenameResponse = {
            success: errors.length === 0,
            results,
            errors: errors.length > 0 ? errors : undefined
        };

        return NextResponse.json(response);

    } catch (error) {
        console.error('Error executing renames:', error);
        return NextResponse.json({ error: 'Failed to execute renames' }, { status: 500 });
    }
}
