from odoo import fields, models, api
from odoo.exceptions import ValidationError


class StudyProgress(models.Model):
    _name = 'yuthon.school.progress'
    _description = '学习进度'
    _order = 'student_id, textbook_id, chapter_id, sequence'
    _inherit = ['mail.thread', 'mail.activity.mixin']

    student_id = fields.Many2one(
        'yuthon.school.student',
        string='学生',
        required=True,
        ondelete='cascade',
    )
    textbook_id = fields.Many2one(
        'yuthon.school.textbook',
        string='教材',
        ondelete='restrict',
    )
    chapter_id = fields.Many2one(
        'yuthon.school.chapter',
        string='章节',
        ondelete='restrict',
    )
    video_id = fields.Many2one(
        'yuthon.school.video',
        string='视频',
        ondelete='restrict',
    )
    sequence = fields.Integer(
        string='排序',
        default=10,
    )
    progress = fields.Float(
        string='进度(%)',
        default=0.0,
        help='0-100，表示该视频的学习完成百分比',
    )
    completed = fields.Boolean(
        string='已完成',
        default=False,
    )
    state = fields.Selection(
        [('not_started', '未开始'), ('in_progress', '进行中'), ('completed', '已完成')],
        string='学习状态',
        compute='_compute_state',
        store=True,
    )
    last_study_date = fields.Datetime(
        string='最后学习时间',
    )
    teacher_id = fields.Many2one(
        'yuthon.school.teacher',
        string='跟踪教师',
        related='student_id.class_id.teacher_id',
        store=True,
        help='该学生所在班级的班主任，用于教师查看进度',
    )
    active = fields.Boolean(
        string='启用',
        default=True,
    )

    @api.depends('progress', 'completed')
    def _compute_state(self):
        """根据进度和完成标记自动计算学习状态"""
        for record in self:
            if record.completed or record.progress >= 100:
                record.state = 'completed'
            elif record.progress > 0:
                record.state = 'in_progress'
            else:
                record.state = 'not_started'

    @api.constrains('progress')
    def _check_progress_range(self):
        """验证进度值必须在 0-100 之间"""
        for record in self:
            if record.progress < 0 or record.progress > 100:
                raise ValidationError(
                    f"进度值 {record.progress} 无效，必须在 0 到 100 之间"
                )