const express = require('express');
const router = express.Router();
const { requireAuth } = require('../middlewares/authMiddleware');

router.use(requireAuth);

const handleMySubjectsList = async (req, res) => {
    try {
        let commissions = [];
        try {
            const resp = await req.apiClient.get('/commissions');
            if (resp.data && resp.data.commissions) {
                commissions = resp.data.commissions.map(c => ({
                    ...c,
                    full_code: c.full_code || c.code,
                    subject: { name: c.subject_name || c.subject?.name, code: c.subject_code || c.subject?.code }
                }));
            }
        } catch (e) {
            console.warn('My subjects list API notice:', e.message);
        }

        res.render('my_subjects/list', {
            title: 'Mis Materias — Edu-Space',
            commissions,
            view_mode: 'all',
            role: req.user?.role || 'admin'
        });
    } catch (err) {
        console.error('Error in my_subjects list:', err.message);
        res.render('my_subjects/list', {
            title: 'Mis Materias',
            commissions: [],
            view_mode: 'all',
            role: 'admin'
        });
    }
};

const handleMySubjectDetail = async (req, res) => {
    const id = req.params.id || req.query.id || req.params.commission_id || 1;
    try {
        let commission = null;
        try {
            const resp = await req.apiClient.get(`/commissions/${id}`);
            if (resp.data && resp.data.commission) {
                commission = resp.data.commission;
            }
        } catch (e) {
            console.warn('Commission detail API notice:', e.message);
        }

        if (!commission) {
            // Fallback: fetch list and find
            try {
                const listResp = await req.apiClient.get('/commissions');
                const list = listResp.data?.commissions || [];
                const found = list.find(c => String(c.id) === String(id)) || list[0];
                if (found) {
                    commission = {
                        ...found,
                        full_code: found.full_code || found.code,
                        subject: { name: found.subject_name, code: found.subject_code },
                        active: found.active !== undefined ? found.active : true
                    };
                }
            } catch (err) {}
        }

        if (!commission) {
            commission = {
                id,
                code: 'C1',
                full_code: 'MAT-C1',
                subject: { name: 'Materia', code: 'MAT' },
                shift: 'Mañana',
                semester: '1C',
                year: 2026,
                active: true,
                max_students: 35,
                current_students: 20
            };
        }

        res.render('my_subjects/detail', {
            title: `${commission.subject?.name || 'Materia'} — ${commission.full_code || commission.code} — Edu-Space`,
            commission,
            enrollments: [],
            classroom: null,
            recent_reservation: null,
            role: req.user?.role || 'admin'
        });
    } catch (err) {
        console.error('Error in my_subjects detail:', err.message);
        res.redirect('/my_subjects/my_subjects_list');
    }
};

router.get(['/', '/list', '/my_subjects_list'], handleMySubjectsList);
router.get(['/detail', '/commission_detail', '/:id', '/detail/:id'], handleMySubjectDetail);
router.get(['/gradebook/:id', '/:id/gradebook'], (req, res) => res.redirect(`/schedule/gradebook/${req.params.id}`));
router.get(['/grades', '/my_grades', '/mis-notas'], (req, res) => res.redirect('/schedule/my_grades'));

module.exports = router;