from odoo import api, fields, models

class CourseScoreItem(models.Model):
    _name = 'course.score.item'
    _description = '成绩项目'
    _rec_name = 'name'
    _order = 'course_id, weight desc, id'
    _inherit = ['mail.thread']


    name = fields.Char(string='项目名称', required=True)
    description = fields.Char(string='项目描述')
    course_id = fields.Many2one('learning.course', string='课程', required=True, ondelete='cascade')
    course_name = fields.Char(related="course_id.name", string="课程名称", readonly=True)
    course_code = fields.Char(related="course_id.code", string="课程代码", readonly=True)
    course_credit = fields.Float(related="course_id.credit", string="学分", readonly=True)
    course_exam_type = fields.Selection(related="course_id.exam_type", string="考核方式", readonly=True)
    homework_id = fields.Many2one('course.homework', string='作业', required=True, ondelete='cascade')
    sequence = fields.Integer(string="排序", default=10)
    score_type = fields.Selection([
        ('homework', '作业'),
        ('exam', '考试'),
        ('experiment', '实验'),
        ('attendance', '考勤'),
        ('midterm', '期中考试'),
        ('final', '期末考试'),
        ('other', '其他'),
    ], string='成绩类型', required=True)
    weight = fields.Float(string='权重(%)', required=True)
    full_score = fields.Float(string='满分', default=100.0)
    is_active = fields.Boolean(string='是否启用', default=True)
    homework_ids = fields.Many2many('course.homework', string='关联作业')

    # 统计字段
    student_count = fields.Integer(string='学生人数', compute='_compute_stats')
    avg_score = fields.Float(string='平均分', compute='_compute_stats')
    max_score = fields.Float(string='最高分', compute='_compute_stats')
    min_score = fields.Float(string='最低分', compute='_compute_stats')
    score_detail_ids = fields.One2many('course.student.score.detail', 'score_item_id', string='成绩明细')

    def action_toggle_active(self):
        for record in self:
            record.is_active = not record.is_active

    def _compute_stats(self):
        for record in self:
            details = self.env['course.student.score.detail'].search([
                ('score_item_id', '=', record.id)
            ])
            scores = details.mapped('score')
            record.student_count = len(details)
            record.avg_score = sum(scores) / len(scores) if scores else 0
            record.max_score = max(scores) if scores else 0
            record.min_score = min(scores) if scores else 0