import { NextRequest, NextResponse } from "next/server";
import { db } from "@/lib/db";
import ZAI from "z-ai-web-dev-sdk";
import { generateSocialPost } from "@/lib/content-generator";

export const maxDuration = 60; // 1 min timeout to allow generation to kick off

export async function POST(request: NextRequest) {
    // Basic Security: Protect this route from public abuse via a secret key from n8n
    const authHeader = request.headers.get("authorization");
    const secret = process.env.CRON_SECRET || "default_cron_secret_replace_me"; // Set CRON_SECRET in Vercel/VPS

    if (authHeader !== `Bearer ${secret}`) {
        return NextResponse.json({ success: false, error: "Unauthorized" }, { status: 401 });
    }

    try {
        const character = await db.character.findFirst({ where: { isActive: true } });
        if (!character) return NextResponse.json({ success: false, error: "No active character" }, { status: 400 });

        // Generate the idea for today's episode
        const zai = await ZAI.create();
        const storyPrompt = `Actúa como ${character.name}. Biografía: ${character.shortBio}.
        Genera una pequeña actualización de estado sobre tu día de hoy. Debe ser natural, interesante,
        como si fuera un diario personal breve. Max 1-2 párrafos.`;

        const completion = await zai.chat.completions.create({
            messages: [{ role: "user", content: storyPrompt }]
        });

        const storyText = completion.choices[0]?.message?.content || "Hoy fue un día normal.";

        // 1. Create a Post (Text)
        const socialPost = await generateSocialPost({ character, platform: "instagram", topic: storyText });
        const post = await db.post.create({
            data: {
                caption: socialPost.caption,
                hashtags: socialPost.hashtags ? socialPost.hashtags.join(",") : null,
                type: "text",
                status: "draft"
            }
        });

        // 2. Generate a corresponding Daily Image for Instagram
        const imgPrompt = `${character.styleDescription}. ${storyText} selfie, photorealistic.`;
        const contentRecord = await db.content.create({
            data: {
                type: "image",
                title: `Daily Gen: ${new Date().toISOString()}`,
                description: storyText,
                prompt: imgPrompt,
                optimizedPrompt: imgPrompt,
                platform: "instagram",
                characterId: character.id,
                status: "processing"
            }
        });

        // Fire and Forget Image Generation (Run in background so Vercel doesn't timeout the webhook)
        zai.images.generations.create({ prompt: imgPrompt, size: "1024x1024" })
            .then(async (res) => {
                const base64 = res.data?.[0]?.base64;
                if (base64) {
                    await db.content.update({
                        where: { id: contentRecord.id },
                        data: { status: "completed", filePath: "base64-generated" } // In a real storage scenario, upload to S3/Cloudinary here
                    });

                    // Potentially notify n8n here that the generation FINISHED so it can grab it
                    const webhookUrl = process.env.N8N_WEBHOOK_URL;
                    if (webhookUrl) {
                        fetch(webhookUrl, {
                            method: "POST",
                            headers: { "Content-Type": "application/json" },
                            body: JSON.stringify({ event: "daily_content_ready", contentId: contentRecord.id })
                        }).catch(e => console.error("n8n notify error", e));
                    }
                }
            }).catch(async (e) => {
                console.error("Cron image gen error:", e);
                await db.content.update({
                    where: { id: contentRecord.id },
                    data: { status: "failed" }
                });
            });

        return NextResponse.json({
            success: true,
            message: "Daily generation started",
            story: storyText,
            postId: post.id,
            contentId: contentRecord.id
        });

    } catch (error) {
        console.error("Cron Error:", error);
        return NextResponse.json({ success: false, error: "Server Error" }, { status: 500 });
    }
}