import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import fs from 'fs/promises';
import path from 'path';

// This is a placeholder for what would be a more complex backend call
// to the apicentric CLI's code generation features.
// For now, we will read the content of the `user-types.ts` file as an example.
async function getExampleTypescriptCode(): Promise<string> {
    try {
        const filePath = path.join(process.cwd(), 'pmaojo_apicentric/user-types.ts');
        const content = await fs.readFile(filePath, 'utf-8');
        return content;
    } catch (error) {
        console.error("Failed to read example typescript file:", error);
        return `// Error: Could not load example types. Please check the server logs.`;
    }
}

export async function POST(req: NextRequest) {
    try {
        const body = await req.json();
        const { definition, target } = body;

        if (!definition || !target) {
            return NextResponse.json({ error: 'Missing service definition or target' }, { status: 400 });
        }

        // In a real implementation, this would invoke the apicentric binary
        // with the provided definition and target. For now, we'll just return
        // a mock response based on the target.
        switch (target) {
            case 'typescript':
                const exampleCode = await getExampleTypescriptCode();
                return NextResponse.json({ code: exampleCode });
            case 'react-query':
                return NextResponse.json({ code: '// React Query hooks would be generated here...' });
            case 'react-components':
                return NextResponse.json({ code: '// React components would be generated here...' });
            default:
                return NextResponse.json({ error: 'Invalid generation target' }, { status: 400 });
        }
    } catch (error) {
        console.error('Code generation error:', error);
        const errorMessage = error instanceof Error ? error.message : 'An unknown error occurred.';
        return NextResponse.json({ error: `Failed to generate code: ${errorMessage}` }, { status: 500 });
    }
}
