from odoo import fields, models, api, _
from odoo.exceptions import UserError

class StudentStudent(models.Model):
    _name = 'student.student'
    _description = 'Student Management'

    name = fields.Char(string='Tên học sinh', required=True)
    student_id = fields.Char(string='Mã học sinh', unique=True, copy=False, required=True, default=lambda self: self._generate_student_id())
    birth_date = fields.Date(string='Ngày sinh')
    gender = fields.Selection([
        ('male', 'Nam giới'),
        ('female', 'Nữ giới')
    ], default='male')
    email = fields.Char(string='Email', required=True, unique=True)
    phone = fields.Char(string='Số điện thoại')
    course_ids = fields.Many2many('student.course', string='Môn học')

    state = fields.Selection([
        ('draft', 'Draft'),
        ('confirmed', 'Confirmed'),
        ('graduated', 'Graduated')
    ], string='Status', default='draft')

    def action_confirm(self):
        self.write({'state': 'confirmed'})

    def action_graduate(self):
        if not self.env.user.has_group('base.group_system'):
            raise UserError(_("Only administrators can graduate students!"))
        self.write({'state': 'graduated'})

    @api.model
    def _generate_student_id(self):
        last_student = self.search([], order='id desc', limit=1)
        new_id = int(last_student.student_id.split('-')[-1]) + 1 if last_student and last_student.student_id else 1
        return f'STU-{fields.Date.today().year}-{new_id:04d}'

    def action_generate_student_id(self):
        for record in self:
            record.write({'student_id': self._generate_student_id()})