import { NextRequest, NextResponse } from "next/server";
import { v4 as uuidv4 } from "uuid";
import { createRouteHandlerClient } from "@supabase/auth-helpers-nextjs";
import { cookies } from "next/headers";
import { Database } from "@/types/supabase";
import { prisma } from "@/lib/prisma";

import { completion } from "zod-gpt";
import * as z from "zod";
import { OpenAIChatApi } from "llm-api";

import { generateTasks } from "@/lib/prompts";

const MIN_TASKS_PER_FEATURE = 6;
const MAX_TASKS_PER_FEATURE = 12;
const OPENAI_MODEL = "gpt-3.5-turbo-16k";

const openai = new OpenAIChatApi(
  {
    apiKey: process.env.OPENAI_API_KEY!,
  },
  {
    model: OPENAI_MODEL,
  }
);

async function getSession(supabase: any) {
  const {
    data: { session },
  } = await supabase.auth.getSession();
  return session;
}

export async function POST(req: NextRequest) {
  const supabase = createRouteHandlerClient<Database>({ cookies });
  const session = await getSession(supabase);

  if (!session) return NextResponse.redirect("/auth");

  try {
    const formData = await req.json();
    const project_name = String(formData.project_name);
    const project_description = String(formData.project_description);
    const project_stack = formData.tech_stack;
    const related_features = formData.related_features;
    const feature = formData.feature;

    console.log("GEN TASKS DATA ===>", formData);

    const task_gen_prompt = generateTasks(
      project_name,
      project_description,
      project_stack,
      related_features,
      feature
    );

    const res = await completion(openai, task_gen_prompt, {
      schema: z.object({
        tasks: z
          .array(
            z.object({
              name: z.string().describe("The task name"),
              description: z.string().describe("The task description"),
              priority: z
                .enum(["low", "medium", "high"])
                .describe("The task priority"),
              order: z
                .number()
                .describe("The order in which the task should be implemented"),
            })
          )
          .min(MIN_TASKS_PER_FEATURE)
          .max(MAX_TASKS_PER_FEATURE),
      }),
    });

    const tasksWithUUID = res.data.tasks.map((task) => ({
      ...task,
      uid: uuidv4(),
      feature_id: feature.id,
    }));

    console.log("TASKS RAW RES ===>", tasksWithUUID);

    return NextResponse.json({ tasks: tasksWithUUID }, { status: 200 });
  } catch (err) {
    console.error(err);
    return NextResponse.json({ error: err }, { status: 500 });
  }
}