import { NextRequest, NextResponse } from 'next/server';

/**
 * Grok Image Generation API
 * Uses xLmiler/grok2api_python backend with OpenAI-compatible format
 */
export async function POST(req: NextRequest) {
    try {
        const body = await req.json();
        const { prompt, numImages = 1, grokApiUrl, apiKey, sso } = body;

        if (!prompt) {
            return NextResponse.json({ error: "Prompt is required" }, { status: 400 });
        }

        if (!grokApiUrl) {
            return NextResponse.json({ error: "Grok API URL not configured" }, { status: 400 });
        }

        console.log(`[Grok Image] Generating ${numImages} image(s) for: "${prompt.substring(0, 50)}..."`);

        // Call xLmiler backend using OpenAI-compatible format
        const headers: Record<string, string> = {
            'Content-Type': 'application/json',
        };

        if (apiKey) {
            headers['Authorization'] = `Bearer ${apiKey}`;
        }

        const response = await fetch(`${grokApiUrl}/v1/chat/completions`, {
            method: 'POST',
            headers,
            body: JSON.stringify({
                model: 'grok-4-imageGen',
                messages: [
                    {
                        role: 'user',
                        content: prompt
                    }
                ],
                // The xLmiler backend handles image generation via chat completions
            })
        });

        if (!response.ok) {
            const errorText = await response.text();
            console.error('[Grok Image] Error:', response.status, errorText);
            return NextResponse.json(
                { error: `Grok API Error: ${response.status} - ${errorText.substring(0, 200)}` },
                { status: response.status }
            );
        }

        const data = await response.json();
        console.log('[Grok Image] Response:', JSON.stringify(data, null, 2).substring(0, 500));

        // Extract image URLs from the response
        // xLmiler returns images in the message content or as markdown images
        const content = data.choices?.[0]?.message?.content || '';

        // Parse image URLs from markdown format: ![...](url) or direct URLs
        const imageUrls: string[] = [];

        // Match markdown image syntax
        const mdImageRegex = /!\[.*?\]\((https?:\/\/[^\s)]+)\)/g;
        let match;
        while ((match = mdImageRegex.exec(content)) !== null) {
            imageUrls.push(match[1]);
        }

        // Also match direct URLs
        const urlRegex = /https:\/\/[^\s"'<>]+\.(png|jpg|jpeg|webp|gif)/gi;
        while ((match = urlRegex.exec(content)) !== null) {
            if (!imageUrls.includes(match[0])) {
                imageUrls.push(match[0]);
            }
        }

        // Return images in our standard format
        const images = imageUrls.slice(0, numImages).map(url => ({
            url,
            prompt,
            model: 'grok-4-imageGen'
        }));

        if (images.length === 0) {
            // Return the raw content for debugging
            return NextResponse.json({
                error: "No images found in response",
                rawContent: content.substring(0, 500)
            }, { status: 500 });
        }

        return NextResponse.json({ images });

    } catch (error: any) {
        console.error('[Grok Image] Error:', error);
        return NextResponse.json(
            { error: error.message || 'Generation failed' },
            { status: 500 }
        );
    }
}