import markupsafe

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


class VideoPlayback(models.Model):
    _name = 'yuthon.school.video'
    _description = '教学视频'
    _order = 'category_id, sequence, name'

    name = fields.Char(
        string='视频标题',
        required=True,
        help='如：Odoo 18 模块结构详解、Binary 字段用法等',
    )
    sequence = fields.Integer(
        string='排序',
        default=10,
        help='同一目录下的视频排序序号',
    )
    category_id = fields.Many2one(
        'yuthon.school.category',
        string='学习目录',
        ondelete='restrict',
        help='该视频所属的学习目录分类',
    )
    chapter_id = fields.Many2one(
        'yuthon.school.chapter',
        string='所属章节',
        ondelete='restrict',
        help='该视频所属的教材章节',
    )
    difficulty = fields.Selection(
        [('beginner', '入门'), ('intermediate', '进阶'), ('advanced', '高级')],
        string='难度等级',
        default='beginner',
        help='该视频的学习难度',
    )
    duration = fields.Char(
        string='视频时长',
        help='如：15:30 表示 15 分钟 30 秒',
    )
    video_file = fields.Binary(
        string='视频文件',
        attachment=True,
        required=True,
        help='上传本地教学视频（支持 MP4、WebM、OGG 等格式）',
    )
    video_filename = fields.Char(
        string='文件名',
        help='视频文件的原始文件名',
    )
    file_size_display = fields.Char(
        string='文件大小',
        compute='_compute_file_info',
        help='视频文件的大小',
    )
    description = fields.Text(
        string='视频简介',
        help='该教学视频的内容概要',
    )
    key_points = fields.Text(
        string='知识要点',
        help='该视频涵盖的关键知识点',
    )
    active = fields.Boolean(
        string='启用',
        default=True,
    )
    video_player = fields.Html(
        string='视频播放器',
        compute='_compute_video_player',
        sanitize=False,
    )

    @api.depends('video_file', 'video_filename')
    def _compute_file_info(self):
        """计算文件大小，显示为可读格式"""
        for record in self:
            if record.video_file:
                encoded = record.video_file
                if isinstance(encoded, bytes):
                    padding = 2 if encoded.endswith(b'==') else (1 if encoded.endswith(b'=') else 0)
                else:
                    padding = 2 if encoded.endswith('==') else (1 if encoded.endswith('=') else 0)
                size = (len(encoded) * 3) // 4 - padding
                if size < 1024:
                    record.file_size_display = f'{size} B'
                elif size < 1024 * 1024:
                    record.file_size_display = f'{size / 1024:.1f} KB'
                elif size < 1024 * 1024 * 1024:
                    record.file_size_display = f'{size / (1024 * 1024):.1f} MB'
                else:
                    record.file_size_display = f'{size / (1024 * 1024 * 1024):.1f} GB'
            else:
                record.file_size_display = '0 B'

    @api.depends('video_file', 'video_filename')
    def _compute_video_player(self):
        """生成视频播放器HTML"""
        mime_map = {
            'mp4': 'video/mp4',
            'webm': 'video/webm',
            'ogg': 'video/ogg',
            'ogv': 'video/ogg',
            'mov': 'video/quicktime',
            'mkv': 'video/x-matroska',
            'avi': 'video/x-msvideo',
        }
        for record in self:
            if record.video_file and record.id:
                mime_type = 'video/mp4'
                if record.video_filename:
                    ext = record.video_filename.rsplit('.', 1)[-1].lower() if '.' in record.video_filename else ''
                    mime_type = mime_map.get(ext, 'video/mp4')

                html = (
                    '<div style="text-align: center; padding: 15px; '
                    'background: #000; border-radius: 8px;">'
                    '<video controls preload="metadata" '
                    'style="width: 100%; max-width: 900px; border-radius: 4px;">'
                    f'<source src="/yuthon_school/video/{record.id}" type="{mime_type}">'
                    '<p style="color: #fff; padding: 20px;">'
                    '您的浏览器不支持视频播放。</p>'
                    '</video></div>'
                )
                record.video_player = markupsafe.Markup(html)
            else:
                record.video_player = markupsafe.Markup(
                    '<div style="text-align: center; color: #999; '
                    'padding: 30px; background: #f5f5f5; border-radius: 8px;">'
                    '<p>请上传视频文件并保存后查看播放。</p></div>'
                )

    @api.constrains('video_filename')
    def _check_video_file(self):
        """验证上传的文件是否为视频格式"""
        allowed_extensions = ['mp4', 'webm', 'ogg', 'ogv', 'mov', 'mkv', 'avi']
        for record in self:
            if record.video_filename:
                ext = record.video_filename.rsplit('.', 1)[-1].lower() if '.' in record.video_filename else ''
                if ext and ext not in allowed_extensions:
                    raise ValidationError(
                        f'请上传视频文件（支持格式：MP4、WebM、OGG、MOV、MKV、AVI），当前文件格式为 .{ext}'
                    )