from odoo import fields, http
from odoo.exceptions import AccessDenied
from odoo.http import request


def _redirect_to_login_if_public(path):
    """Manual login-required redirect - see community_classifieds for why this
    is needed instead of auth='user' (a bug in this Odoo version's own
    SessionExpiredException -> login-redirect handling)."""
    if request.env.user._is_public():
        return request.redirect(f'/web/login?redirect={path}')
    return None


class SchoolAttendanceController(http.Controller):

    def _get_teacher_classes(self):
        partner = request.env.user.partner_id
        return request.env['community.school.class'].sudo().search([('teacher_id', '=', partner.id)])

    @http.route(['/school/attendance'], type='http', auth='public', website=True)
    def attendance_home(self, class_id=None, date=None, **kwargs):
        redirect = _redirect_to_login_if_public('/school/attendance')
        if redirect:
            return redirect
        classes = self._get_teacher_classes()
        if not classes:
            return request.render('community_school.portal_no_classes', {})

        selected_class = classes.filtered(lambda c: c.id == int(class_id)) if class_id else classes[:1]
        if not selected_class:
            selected_class = classes[:1]
        selected_date = date or fields.Date.context_today(request.env.user).isoformat()

        Enrollment = request.env['community.school.enrollment'].sudo()
        enrollments = Enrollment.search([
            ('class_id', '=', selected_class.id), ('state', '=', 'enrolled'),
        ])
        existing_by_enrollment = {
            attendance.enrollment_id.id: attendance
            for attendance in request.env['community.school.attendance'].sudo().search([
                ('class_id', '=', selected_class.id), ('date', '=', selected_date),
            ])
        }
        roster = [
            {'enrollment': enrollment, 'attendance': existing_by_enrollment.get(enrollment.id)}
            for enrollment in enrollments
        ]

        return request.render('community_school.portal_attendance', {
            'classes': classes,
            'selected_class': selected_class,
            'selected_date': selected_date,
            'roster': roster,
        })

    @http.route(['/school/attendance/save'], type='jsonrpc', auth='user', website=True)
    def attendance_save(self, class_id=None, date=None, lines=None, **kwargs):
        classes = self._get_teacher_classes()
        klass = classes.filtered(lambda c: c.id == int(class_id))
        if not klass:
            raise AccessDenied()

        Attendance = request.env['community.school.attendance'].sudo()
        Enrollment = request.env['community.school.enrollment'].sudo()
        saved = 0
        for line in (lines or []):
            enrollment = Enrollment.browse(int(line.get('enrollment_id', 0)))
            if not enrollment.exists() or enrollment.class_id.id != klass.id:
                continue
            vals = {'state': line.get('state', 'present'), 'notes': line.get('notes') or False}
            record = Attendance.search([
                ('enrollment_id', '=', enrollment.id), ('date', '=', date),
            ], limit=1)
            if record:
                record.write(vals)
            else:
                vals.update({'enrollment_id': enrollment.id, 'date': date})
                record = Attendance.create(vals)
            saved += 1
            if record.state == 'absent':
                record._send_absence_notice()

        return {'status': 'ok', 'saved': saved}