from odoo import fields, models


class ProgressWizard(models.TransientModel):
    """批量更新学习进度向导（TransientModel 演示）

    TransientModel 的特点：
    1. 数据存储在临时表中，定期自动清理
    2. 用于弹出式向导交互，不保留持久数据
    3. 权限模型与普通 Model 不同（通常不需要 unlink 权限）
    """
    _name = 'yuthon.school.progress.wizard'
    _description = '批量更新学习进度'

    class_id = fields.Many2one(
        'yuthon.school.class',
        string='班级',
        required=True,
    )
    chapter_id = fields.Many2one(
        'yuthon.school.chapter',
        string='章节',
        required=True,
    )
    textbook_id = fields.Many2one(
        'yuthon.school.textbook',
        string='所属教材',
        related='chapter_id.textbook_id',
        readonly=True,
    )
    progress_value = fields.Float(
        string='设置进度(%)',
        default=100.0,
        help='将该班级所有学生此章节的进度设置为该值（0-100）',
    )
    completed = fields.Boolean(
        string='标记为已完成',
        default=True,
    )

    def action_apply(self):
        """批量更新该班级所有学生的指定章节进度"""
        self.ensure_one()
        Progress = self.env['yuthon.school.progress']
        students = self.class_id.student_ids
        now = fields.Datetime.now()

        for student in students:
            existing = Progress.search([
                ('student_id', '=', student.id),
                ('chapter_id', '=', self.chapter_id.id),
            ], limit=1)
            if existing:
                existing.write({
                    'progress': self.progress_value,
                    'completed': self.completed,
                    'last_study_date': now,
                })
            else:
                Progress.create({
                    'student_id': student.id,
                    'chapter_id': self.chapter_id.id,
                    'textbook_id': self.chapter_id.textbook_id.id,
                    'progress': self.progress_value,
                    'completed': self.completed,
                    'last_study_date': now,
                })

        return {'type': 'ir.actions.act_window_close'}