from odoo import api, fields, models


class LearningCourse(models.Model):
    _name = 'learning.course'
    _description = '课程'
    _inherit = ['mail.thread', 'mail.activity.mixin']

    name = fields.Char(string='课程名称', required=True)
    code = fields.Char(string='课程代码', required=True, index=True)
    english_name = fields.Char(string='英文名称')
    credit = fields.Float(string='学分', required=True)
    exam_type = fields.Selection([
        ('exam', '考试'),
        ('assessment', '考查'),
    ], string='考核方式')
    description = fields.Html(string='课程简介')
    objectives = fields.Html(string='教学目标')
    state = fields.Selection([
        ('draft', '草稿'),
        ('published', '已发布'),
    ], default='draft', required=True)
    # ==================== 关联章节 ====================
    chapter_ids = fields.One2many('course.chapter', 'course_id', string='章节')
    chapter_count = fields.Integer(string='章节数', compute='_compute_chapter_count', store=True)
    # ==================== 关联教学大纲/教案 ====================
    syllabus_ids = fields.One2many('course.syllabus', 'course_id', string='教学大纲/教案')
    syllabus_count = fields.Integer(string='大纲/教案数', compute='_compute_syllabus_count', store=True)
    # 按类型统计
    syllabus_count_total = fields.Integer(string='大纲总数', compute='_compute_syllabus_count')
    lesson_plan_count = fields.Integer(string='教案总数', compute='_compute_syllabus_count')
    # ==================== 统计资源（通过章节关联） ====================
    resource_count = fields.Integer(string='资源总数', compute='_compute_resource_count', store=True)
    video_count = fields.Integer(string='视频数', compute='_compute_resource_count', store=True)
    doc_count = fields.Integer(string='文档数', compute='_compute_resource_count', store=True)

    # 汇总所有章节的资源
    resource_all_ids = fields.One2many(
        comodel_name='course.chapter.resource',
        inverse_name=None,
        compute='_compute_resource_all_ids',
        string='资源列表',
        readonly=True
    )

    @api.depends('chapter_ids', 'chapter_ids.resource_ids')
    def _compute_resource_all_ids(self):
        for record in self:
            # 取出所有章节下的资源记录
            all_resources = record.chapter_ids.mapped('resource_ids')
            record.resource_all_ids = all_resources

    # ==================== 计算字段方法 ====================
    @api.depends('chapter_ids')
    def _compute_chapter_count(self):
        for record in self:
            record.chapter_count = len(record.chapter_ids)

    @api.depends('syllabus_ids', 'syllabus_ids.syllabus_type')
    def _compute_syllabus_count(self):
        for record in self:
            record.syllabus_count = len(record.syllabus_ids)
            record.syllabus_count_total = len(record.syllabus_ids.filtered(lambda s: s.syllabus_type == 'syllabus'))
            record.lesson_plan_count = len(record.syllabus_ids.filtered(lambda s: s.syllabus_type == 'lesson_plan'))

    @api.depends('chapter_ids.resource_ids', 'chapter_ids.resource_ids.resource_type')
    def _compute_resource_count(self):
        for record in self:
            resources = record.chapter_ids.mapped('resource_ids')
            record.resource_count = len(resources)
            record.video_count = len(resources.filtered(lambda r: r.resource_type == 'video'))
            record.doc_count = len(resources.filtered(lambda r: r.resource_type in ['pdf', 'ppt']))

    # ==================== 业务方法 ====================
    def action_publish(self):
        """发布课程"""
        self.state = 'published'

    def action_draft(self):
        """退回草稿"""
        self.state = 'draft'

    def action_view_chapters(self):
        """查看章节"""
        return {
            'type': 'ir.actions.act_window',
            'name': '课程章节',
            'res_model': 'course.chapter',
            'view_mode': 'list,form',
            'domain': [('course_id', '=', self.id)],
            'context': {'default_course_id': self.id},
        }

    def action_view_syllabus(self):
        """查看教学大纲/教案"""
        return {
            'type': 'ir.actions.act_window',
            'name': '教学大纲/教案',
            'res_model': 'course.syllabus',
            'view_mode': 'list,form',
            'domain': [('course_id', '=', self.id)],
            'context': {'default_course_id': self.id},
        }

    def action_view_resources(self):
        """查看所有资源"""
        return {
            'type': 'ir.actions.act_window',
            'name': '教学资源',
            'res_model': 'course.chapter.resource',
            'view_mode': 'list,form',
            'domain': [('chapter_id.course_id', '=', self.id)],
        }