from odoo import fields, models


class McBatch(models.Model):
    _name = "mc.batch"
    _description = "Batch"
    _order = "year_id desc, program_id, name"
    _rec_name = "name"

    name = fields.Char(string="Name", required=True, help='e.g. "Grade 8-A".')
    program_id = fields.Many2one(
        "mc.program", string="Program", required=True, ondelete="restrict",
    )
    year_id = fields.Many2one(
        "mc.academic.year", string="Academic Year", required=True, ondelete="restrict",
    )
    class_teacher_id = fields.Many2one("hr.employee", string="Class Teacher", ondelete="restrict")
    capacity = fields.Integer(string="Capacity")
    room_id = fields.Many2one("mc.room", string="Room", ondelete="restrict")

    _name_year_uniq = models.Constraint(
        "unique(name, year_id)",
        "A batch with this name already exists for this academic year.",
    )