from odoo import fields, models, api


class SchoolProgress(models.Model):
    """学习进展——记录每位学员在每门课程中的学习情况。"""

    _name = 'yuthon.school.progress'
    _description = '学习进展'
    _order = 'course_id, student_id'
    _rec_name = 'name'

    name = fields.Char(string='名称', compute='_compute_name', store=True)
    course_id = fields.Many2one(
        'yuthon.school.course', string='课程', required=True, ondelete='cascade')
    student_id = fields.Many2one(
        'yuthon.school.student', string='学员', required=True, ondelete='cascade')
    teacher_id = fields.Many2one(
        'res.users', string='任课教师',
        related='course_id.teacher_id', readonly=True, store=True)

    # 章节进度（基于课程章节完成情况动态计算，仅用于展示，不入库）
    chapter_total = fields.Integer(string='章节总数', compute='_compute_chapter_progress')
    chapter_done = fields.Integer(string='已完成章节', compute='_compute_chapter_progress')
    progress_rate = fields.Float(string='学习进度(%)', compute='_compute_chapter_progress')

    # 状态：普通可写字段（搜索/过滤需用 stored 字段），由章节完成情况触发更新
    status = fields.Selection(
        [('not_started', '未开始'), ('in_progress', '进行中'), ('completed', '已完成')],
        string='状态', default='not_started', index=True, required=True)

    last_study_date = fields.Date(string='最近学习日期')
    score = fields.Float(string='综合得分')
    note = fields.Text(string='备注')
    active = fields.Boolean(string='启用', default=True)

    def _compute_chapter_progress(self):
        """根据课程章节的「已完成学员」计算该学员的进度（展示用）。"""
        for r in self:
            chapters = r.course_id.chapter_ids if r.course_id else self.env['yuthon.school.course.chapter']
            total = len(chapters)
            done = sum(1 for c in chapters if r.student_id in c.completed_student_ids)
            r.chapter_total = total
            r.chapter_done = done
            r.progress_rate = (done / total * 100.0) if total else 0.0

    def recompute_status(self):
        """依据章节完成情况刷新状态（在章节完成状态变化时调用）。"""
        for r in self:
            total = r.chapter_total
            done = r.chapter_done
            if total == 0 or done == 0:
                new_status = 'not_started'
            elif done >= total:
                new_status = 'completed'
            else:
                new_status = 'in_progress'
            if r.status != new_status:
                r.write({'status': new_status})

    @api.model_create_multi
    def create(self, vals_list):
        recs = super().create(vals_list)
        recs.recompute_status()
        return recs

    @api.depends('course_id', 'student_id')
    def _compute_name(self):
        for r in self:
            r.name = '%s · %s' % (r.course_id.name or '', r.student_id.name or '')