const express = require('express');
const router = express.Router();
const Cycle = require('../models/Cycle');

router.get('/', async (req, res) => {
  try {
    const cycles = await Cycle.getAll();
    res.json({ success: true, data: cycles });
  } catch (error) {
    console.error('Error in GET /api/cycles:', error);
    res.status(500).json({ success: false, error: error.message });
  }
});

router.get('/active', async (req, res) => {
  try {
    const cycle = await Cycle.getActive();
    if (!cycle) return res.status(404).json({ success: false, error: 'No active cycle found' });
    res.json({ success: true, data: cycle });
  } catch (error) {
    res.status(500).json({ success: false, error: error.message });
  }
});

router.get('/:id', async (req, res) => {
  try {
    const cycle = await Cycle.getById(req.params.id);
    if (!cycle) return res.status(404).json({ success: false, error: 'Cycle not found' });
    res.json({ success: true, data: cycle });
  } catch (error) {
    res.status(500).json({ success: false, error: error.message });
  }
});

router.post('/', async (req, res) => {
  try {
    const { id, totalDays, currentDay, startDate, status } = req.body;
    if (!id || !totalDays || currentDay === undefined || !startDate || !status) {
      return res.status(400).json({ success: false, error: 'Missing required fields' });
    }

    // CRITICAL: If creating a new "Active" cycle, automatically mark all previous "Active" cycles as "Completed"
    if (status === 'Active') {
      await Cycle.markAllActiveAsCompleted();
    }

    const cycle = await Cycle.create(req.body);
    res.status(201).json({ success: true, data: cycle });
  } catch (error) {
    res.status(500).json({ success: false, error: error.message });
  }
});

router.put('/:id', async (req, res) => {
  try {
    const cycle = await Cycle.update(req.params.id, req.body);
    if (!cycle) return res.status(404).json({ success: false, error: 'Cycle not found' });
    res.json({ success: true, data: cycle });
  } catch (error) {
    res.status(500).json({ success: false, error: error.message });
  }
});

router.delete('/:id', async (req, res) => {
  try {
    const deleted = await Cycle.delete(req.params.id);
    if (!deleted) return res.status(404).json({ success: false, error: 'Cycle not found' });
    res.json({ success: true, message: 'Cycle deleted successfully' });
  } catch (error) {
    res.status(500).json({ success: false, error: error.message });
  }
});

module.exports = router;