const express = require("express");
const router = express.Router();
const db = require("../models");
const { Op } = require("sequelize");

// POST /api/v1/schedule - Save an appointment
router.post("/schedule", async (req, res) => {
  try {
    const { user_id, start_time, end_time } = req.body;
    if (!start_time || !end_time) {
      return res
        .status(400)
        .json({
          success: false,
          error: "start_time and end_time are required",
        });
    }
    const appointment = await db.schedule.create({
      user_id,
      start_time,
      end_time,
    });
    res.json({ success: true, data: appointment });
  } catch (err) {
    res.status(500).json({ success: false, error: err.message });
  }
});

// GET /api/v1/booked - Return available times excluding scheduled
router.get("/booked", async (req, res) => {
  try {
    // For demo: get all availability, then exclude times that overlap with schedule
    const availabilities = await db.availability.findAll();
    const schedules = await db.schedule.findAll();

    // This is a simple exclusion, not a full calendar logic
    // For each availability, exclude if any schedule overlaps
    const availableTimes = availabilities.filter((avail) => {
      const availStart = avail.start_time;
      const availEnd = avail.end_time;
      const overlap = schedules.some((sch) => {
        return sch.start_time < availEnd && sch.end_time > availStart;
      });
      return !overlap;
    });
    res.json({ success: true, data: availableTimes });
  } catch (err) {
    res.status(500).json({ success: false, error: err.message });
  }
});

module.exports = router;