import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn, ManyToOne, JoinColumn, OneToMany } from 'typeorm';
import { UserEntity } from '../users/user.entity';
import { SilverKnowledgeCategory } from './silver-knowledge-category.entity';
import { SilverKnowledgeInteraction } from './silver-knowledge-interaction.entity';
import { SilverKnowledgeTagRelation } from './silver-knowledge-tag-relation.entity';
import { z } from '@hono/zod-openapi';

export enum KnowledgeType {
  ARTICLE = 1,      // 文章
  VIDEO = 2,        // 视频
  DOCUMENT = 3,     // 文档
  COURSE = 4,       // 课程
  EXPERIENCE = 5,   // 经验分享
  CASE = 6,         // 案例分享
  RESEARCH = 7      // 研究报告
}

export enum KnowledgeStatus {
  DRAFT = 0,        // 草稿
  PUBLISHED = 1,    // 已发布
  HIDDEN = 2,       // 已隐藏
  DELETED = 3,      // 已删除
  REVIEWING = 4     // 审核中
}

@Entity('silver_knowledges')
export class SilverKnowledge {
  @PrimaryGeneratedColumn({ unsigned: true })
  id!: number;

  @Column({ name: 'user_id', type: 'int', unsigned: true })
  userId!: number;

  @ManyToOne(() => UserEntity, user => user.silverKnowledges)
  @JoinColumn({ name: 'user_id' })
  user!: UserEntity;

  @Column({ name: 'category_id', type: 'int', unsigned: true, nullable: true })
  categoryId!: number | null;

  @ManyToOne(() => SilverKnowledgeCategory, category => category.silverKnowledges)
  @JoinColumn({ name: 'category_id' })
  category!: SilverKnowledgeCategory | null;

  @Column({ name: 'title', type: 'varchar', length: 255 })
  title!: string;

  @Column({ name: 'content', type: 'text' })
  content!: string;

  @Column({ name: 'summary', type: 'text', nullable: true })
  summary!: string | null;

  @Column({ name: 'type', type: 'tinyint', unsigned: true })
  type!: KnowledgeType;

  @Column({ name: 'tags', type: 'text', nullable: true })
  tags!: string | null; // JSON array of tags

  @Column({ name: 'cover_image', type: 'varchar', length: 500, nullable: true })
  coverImage!: string | null;

  @Column({ name: 'attachments', type: 'text', nullable: true })
  attachments!: string | null; // JSON array of attachment URLs

  @Column({ name: 'status', type: 'tinyint', default: KnowledgeStatus.DRAFT })
  status!: KnowledgeStatus;

  // 统计字段 - 单个知识统计
  @Column({ name: 'view_count', type: 'int', unsigned: true, default: 0 })
  viewCount!: number;

  @Column({ name: 'download_count', type: 'int', unsigned: true, default: 0 })
  downloadCount!: number;

  @Column({ name: 'like_count', type: 'int', unsigned: true, default: 0 })
  likeCount!: number;

  @Column({ name: 'comment_count', type: 'int', unsigned: true, default: 0 })
  commentCount!: number;

  @Column({ name: 'favorite_count', type: 'int', unsigned: true, default: 0 })
  favoriteCount!: number;

  @Column({ name: 'share_count', type: 'int', unsigned: true, default: 0 })
  shareCount!: number;

  @Column({ name: 'read_count', type: 'int', unsigned: true, default: 0 })
  readCount!: number; // 更准确的阅读统计

  // 推荐和排序
  @Column({ name: 'is_featured', type: 'tinyint', default: 0 })
  isFeatured!: number;

  @Column({ name: 'featured_at', type: 'timestamp', nullable: true })
  featuredAt!: Date | null;

  @Column({ name: 'sort_order', type: 'int', default: 0 })
  sortOrder!: number;

  // 元数据
  @Column({ name: 'keywords', type: 'text', nullable: true })
  keywords!: string | null; // 用于搜索优化的关键词

  @Column({ name: 'source', type: 'varchar', length: 255, nullable: true })
  source!: string | null; // 知识来源

  @Column({ name: 'author', type: 'varchar', length: 100, nullable: true })
  author!: string | null; // 原作者

  @Column({ name: 'duration', type: 'int', unsigned: true, nullable: true })
  duration!: number | null; // 视频时长(秒)或阅读时长(分钟)

  // 时间戳
  @CreateDateColumn({ name: 'created_at' })
  createdAt!: Date;

  @UpdateDateColumn({ name: 'updated_at' })
  updatedAt!: Date;

  @Column({ name: 'published_at', type: 'timestamp', nullable: true })
  publishedAt!: Date | null;

  // 用户跟踪
  @Column({ name: 'created_by', type: 'int', nullable: true })
  createdBy!: number | null;

  @Column({ name: 'updated_by', type: 'int', nullable: true })
  updatedBy!: number | null;

  @OneToMany(() => SilverKnowledgeInteraction, interaction => interaction.knowledge)
  silverKnowledgeInteractions!: SilverKnowledgeInteraction[];

  @OneToMany(() => SilverKnowledgeTagRelation, tagRelation => tagRelation.knowledge)
  silverKnowledgeTagRelations!: SilverKnowledgeTagRelation[];
}

// Zod Schema定义
export const SilverKnowledgeSchema = z.object({
  id: z.number().int().positive().openapi({
    description: '知识ID',
    example: 1
  }),
  userId: z.number().int().positive().openapi({
    description: '发布用户ID',
    example: 1
  }),
  user: UserSchema.optional().openapi({
    description: '发布用户',
    example: {
      id: 1,
      username: 'user123',
      nickname: '张三'
    }
  }),
  categoryId: z.number().int().positive().optional().nullable().openapi({
    description: '分类ID',
    example: 5
  }),
  category: SilverKnowledgeCategorySchema.optional().nullable().openapi({
    description: '知识分类',
    example: {
      id: 5,
      name: '健康养生'
    }
  }),
  title: z.string().max(255).openapi({
    description: '知识标题',
    example: '老年人健康饮食指南'
  }),
  content: z.string().openapi({
    description: '知识内容',
    example: '老年人健康饮食需要注意以下几点...'
  }),
  summary: z.string().optional().openapi({
    description: '知识摘要',
    example: '本指南详细介绍了老年人健康饮食的科学方法...'
  }),
  type: z.coerce.number().int().min(1).max(7).openapi({
    description: '知识类型 1:文章 2:视频 3:文档 4:课程 5:经验分享 6:案例分享 7:研究报告',
    example: 1
  }),
  tags: z.string().optional().nullable().openapi({
    description: '标签(JSON数组)',
    example: '["健康养生", "老年人", "饮食"]'
  }),
  coverImage: z.string().max(500).url().optional().nullable().openapi({
    description: '封面图片URL',
    example: 'https://example.com/cover.jpg'
  }),
  attachments: z.string().optional().nullable().openapi({
    description: '附件URL(JSON数组)',
    example: '["https://example.com/attach1.pdf"]'
  }),
  status: z.coerce.number().int().min(0).max(4).default(0).openapi({
    description: '状态 0:草稿 1:已发布 2:已隐藏 3:已删除 4:审核中',
    example: 1
  }),
  viewCount: z.number().int().min(0).default(0).openapi({
    description: '浏览次数',
    example: 1234
  }),
  downloadCount: z.number().int().min(0).default(0).openapi({
    description: '下载次数',
    example: 567
  }),
  likeCount: z.number().int().min(0).default(0).openapi({
    description: '点赞次数',
    example: 234
  }),
  commentCount: z.number().int().min(0).default(0).openapi({
    description: '评论次数',
    example: 89
  }),
  favoriteCount: z.number().int().min(0).default(0).openapi({
    description: '收藏次数',
    example: 156
  }),
  shareCount: z.number().int().min(0).default(0).openapi({
    description: '分享次数',
    example: 78
  }),
  readCount: z.number().int().min(0).default(0).openapi({
    description: '阅读次数',
    example: 2345
  }),
  isFeatured: z.coerce.number().int().min(0).max(1).default(0).openapi({
    description: '是否推荐 0:否 1:是',
    example: 1
  }),
  featuredAt: z.date().optional().nullable().openapi({
    description: '推荐时间',
    example: '2024-01-01T00:00:00Z'
  }),
  sortOrder: z.number().int().default(0).openapi({
    description: '排序顺序',
    example: 1
  }),
  keywords: z.string().optional().nullable().openapi({
    description: '搜索关键词',
    example: '健康,养生,老年人'
  }),
  source: z.string().max(255).optional().nullable().openapi({
    description: '知识来源',
    example: '中国老年学会'
  }),
  author: z.string().max(100).optional().nullable().openapi({
    description: '原作者',
    example: '张医生'
  }),
  duration: z.number().int().positive().optional().nullable().openapi({
    description: '时长(秒/分钟)',
    example: 15
  }),
  createdAt: z.date().openapi({
    description: '创建时间',
    example: '2024-01-01T00:00:00Z'
  }),
  updatedAt: z.date().openapi({
    description: '更新时间',
    example: '2024-01-01T00:00:00Z'
  }),
  publishedAt: z.date().optional().nullable().openapi({
    description: '发布时间',
    example: '2024-01-01T00:00:00Z'
  })
});

export const CreateSilverKnowledgeDto = z.object({
  userId: z.coerce.number().int().positive().openapi({
    description: '发布用户ID',
    example: 1
  }),
  categoryId: z.number().int().positive().optional().openapi({
    description: '分类ID',
    example: 5
  }),
  title: z.string().max(255).openapi({
    description: '知识标题',
    example: '老年人健康饮食指南'
  }),
  content: z.string().openapi({
    description: '知识内容',
    example: '老年人健康饮食需要注意以下几点...'
  }),
  summary: z.string().optional().openapi({
    description: '知识摘要',
    example: '本指南详细介绍了老年人健康饮食的科学方法...'
  }),
  type: z.coerce.number().int().min(1).max(7).openapi({
    description: '知识类型',
    example: 1
  }),
  tags: z.string().optional().openapi({
    description: '标签(JSON数组)',
    example: '["健康养生", "老年人", "饮食"]'
  }),
  coverImage: z.string().max(500).url().optional().openapi({
    description: '封面图片URL',
    example: 'https://example.com/cover.jpg'
  }),
  attachments: z.string().optional().openapi({
    description: '附件URL(JSON数组)',
    example: '["https://example.com/attach1.pdf"]'
  }),
  keywords: z.string().optional().openapi({
    description: '搜索关键词',
    example: '健康,养生,老年人'
  }),
  source: z.string().max(255).optional().openapi({
    description: '知识来源',
    example: '中国老年学会'
  }),
  author: z.string().max(100).optional().openapi({
    description: '原作者',
    example: '张医生'
  }),
  duration: z.number().int().positive().optional().openapi({
    description: '时长(秒/分钟)',
    example: 15
  })
});

export const UpdateSilverKnowledgeDto = z.object({
  categoryId: z.number().int().positive().optional().openapi({
    description: '分类ID',
    example: 5
  }),
  title: z.string().max(255).optional().openapi({
    description: '知识标题',
    example: '老年人健康饮食指南'
  }),
  content: z.string().optional().openapi({
    description: '知识内容',
    example: '老年人健康饮食需要注意以下几点...'
  }),
  summary: z.string().optional().openapi({
    description: '知识摘要',
    example: '本指南详细介绍了老年人健康饮食的科学方法...'
  }),
  type: z.coerce.number().int().min(1).max(7).optional().openapi({
    description: '知识类型',
    example: 1
  }),
  tags: z.string().optional().openapi({
    description: '标签(JSON数组)',
    example: '["健康养生", "老年人", "饮食"]'
  }),
  coverImage: z.string().max(500).url().optional().openapi({
    description: '封面图片URL',
    example: 'https://example.com/cover.jpg'
  }),
  attachments: z.string().optional().openapi({
    description: '附件URL(JSON数组)',
    example: '["https://example.com/attach1.pdf"]'
  }),
  status: z.coerce.number().int().min(0).max(4).optional().openapi({
    description: '状态',
    example: 1
  }),
  keywords: z.string().optional().openapi({
    description: '搜索关键词',
    example: '健康,养生,老年人'
  }),
  source: z.string().max(255).optional().openapi({
    description: '知识来源',
    example: '中国老年学会'
  }),
  author: z.string().max(100).optional().openapi({
    description: '原作者',
    example: '张医生'
  }),
  duration: z.number().int().positive().optional().openapi({
    description: '时长(秒/分钟)',
    example: 15
  }),
  isFeatured: z.coerce.number().int().min(0).max(1).optional().openapi({
    description: '是否推荐',
    example: 1
  }),
  featuredAt: z.date().optional().nullable().openapi({
    description: '推荐时间',
    example: '2024-01-01T00:00:00Z'
  }),
  sortOrder: z.number().int().optional().openapi({
    description: '排序顺序',
    example: 1
  })
});