const express = require("express");
const { DateTime } = require("luxon");
const Schedule = require("../models/Schedule");

const router = express.Router();

// Korea Standard Time zone
const KST_TIMEZONE = "Asia/Seoul";

const startOfWeek = () => {
  // Get current time in KST and find the start of the week (Monday)
  const nowKst = DateTime.now().setZone(KST_TIMEZONE);
  // Luxon uses 1 = Monday, 7 = Sunday
  const startOfWeekKst = nowKst.startOf("week"); // Monday 00:00:00.000
  return startOfWeekKst.toJSDate();
};

const endOfWeek = () => {
  // Get current time in KST and find the end of the week (Sunday)
  const nowKst = DateTime.now().setZone(KST_TIMEZONE);
  const endOfWeekKst = nowKst.endOf("week"); // Sunday 23:59:59.999
  return endOfWeekKst.toJSDate();
};

const startOfMonth = () => {
  const nowKst = DateTime.now().setZone(KST_TIMEZONE);
  return nowKst.startOf("month").toJSDate();
};

const endOfMonth = () => {
  const nowKst = DateTime.now().setZone(KST_TIMEZONE);
  return nowKst.endOf("month").toJSDate();
};

router.get("/", async (req, res) => {
  try {
    const schedules = await Schedule.find().sort({ startDate: 1 });
    res.json(schedules);
  } catch (error) {
    res.status(500).json({ message: "Failed to fetch schedules" });
  }
});

router.get("/week", async (req, res) => {
  try {
    const start = startOfWeek();
    const end = endOfWeek();
    const schedules = await Schedule.find({
      startDate: { $lte: end },
      endDate: { $gte: start },
    }).sort({ startDate: 1 });
    res.json(schedules);
  } catch (error) {
    res.status(500).json({ message: "Failed to fetch weekly schedules" });
  }
});

router.get("/month", async (req, res) => {
  try {
    const start = startOfMonth();
    const end = endOfMonth();
    const schedules = await Schedule.find({
      startDate: { $lte: end },
      endDate: { $gte: start },
    }).sort({ startDate: 1 });
    res.json(schedules);
  } catch (error) {
    res.status(500).json({ message: "Failed to fetch monthly schedules" });
  }
});

router.post("/", async (req, res) => {
  try {
    const schedule = await Schedule.create(req.body);
    res.status(201).json(schedule);
  } catch (error) {
    res.status(400).json({ message: "Failed to create schedule" });
  }
});

router.get("/:id", async (req, res) => {
  try {
    const schedule = await Schedule.findById(req.params.id);
    if (!schedule) {
      return res.status(404).json({ message: "Schedule not found" });
    }
    res.json(schedule);
  } catch (error) {
    res.status(400).json({ message: "Failed to fetch schedule" });
  }
});

router.put("/:id", async (req, res) => {
  try {
    const schedule = await Schedule.findByIdAndUpdate(req.params.id, req.body, {
      new: true,
    });
    if (!schedule) {
      return res.status(404).json({ message: "Schedule not found" });
    }
    res.json(schedule);
  } catch (error) {
    res.status(400).json({ message: "Failed to update schedule" });
  }
});

router.delete("/:id", async (req, res) => {
  try {
    const schedule = await Schedule.findByIdAndDelete(req.params.id);
    if (!schedule) {
      return res.status(404).json({ message: "Schedule not found" });
    }
    res.json({ ok: true });
  } catch (error) {
    res.status(400).json({ message: "Failed to delete schedule" });
  }
});

module.exports = router;