/**
 * Drizzle Schema Example
 *
 * This file demonstrates how to define database tables and relationships
 * using Drizzle ORM with Neon Postgres.
 *
 * Usage: Import these tables in your application code for type-safe queries
 */

import {
  pgTable,
  serial,
  text,
  varchar,
  integer,
  timestamp,
  boolean,
  decimal,
  json,
  index,
  unique,
  foreignKey,
} from 'drizzle-orm/pg-core';
import { relations } from 'drizzle-orm';

/**
 * Users Table
 *
 * Stores basic user information. Can be extended with additional fields
 * as needed by your application.
 */
export const users = pgTable(
  'users',
  {
    id: serial('id').primaryKey(),
    email: varchar('email', { length: 255 }).notNull().unique(),
    name: varchar('name', { length: 255 }).notNull(),
    password: text('password'), // If not using external auth
    avatar: text('avatar'), // URL to avatar image
    isActive: boolean('is_active').default(true),
    createdAt: timestamp('created_at').defaultNow(),
    updatedAt: timestamp('updated_at').defaultNow(),
  },
  (table) => ({
    emailIdx: index('users_email_idx').on(table.email),
    createdAtIdx: index('users_created_at_idx').on(table.createdAt),
  })
);

/**
 * Profiles Table
 *
 * Extended user information. Uses a foreign key to link with users.
 */
export const profiles = pgTable('profiles', {
  id: serial('id').primaryKey(),
  userId: integer('user_id')
    .notNull()
    .references(() => users.id, { onDelete: 'cascade' }),
  bio: text('bio'),
  location: varchar('location', { length: 255 }),
  website: varchar('website', { length: 255 }),
  phone: varchar('phone', { length: 20 }),
  createdAt: timestamp('created_at').defaultNow(),
  updatedAt: timestamp('updated_at').defaultNow(),
});

/**
 * Posts Table
 *
 * Blog posts created by users.
 */
export const posts = pgTable(
  'posts',
  {
    id: serial('id').primaryKey(),
    userId: integer('user_id')
      .notNull()
      .references(() => users.id, { onDelete: 'cascade' }),
    title: varchar('title', { length: 255 }).notNull(),
    slug: varchar('slug', { length: 255 }).notNull().unique(),
    content: text('content').notNull(),
    excerpt: text('excerpt'),
    published: boolean('published').default(false),
    publishedAt: timestamp('published_at'),
    createdAt: timestamp('created_at').defaultNow(),
    updatedAt: timestamp('updated_at').defaultNow(),
  },
  (table) => ({
    userIdIdx: index('posts_user_id_idx').on(table.userId),
    publishedIdx: index('posts_published_idx').on(table.published),
    slugIdx: index('posts_slug_idx').on(table.slug),
  })
);

/**
 * Comments Table
 *
 * Comments on blog posts. Supports nested comments via parent_id.
 */
export const comments = pgTable(
  'comments',
  {
    id: serial('id').primaryKey(),
    postId: integer('post_id')
      .notNull()
      .references(() => posts.id, { onDelete: 'cascade' }),
    userId: integer('user_id')
      .notNull()
      .references(() => users.id, { onDelete: 'cascade' }),
    parentId: integer('parent_id').references(() => comments.id, {
      onDelete: 'cascade',
    }),
    content: text('content').notNull(),
    approved: boolean('approved').default(false),
    createdAt: timestamp('created_at').defaultNow(),
    updatedAt: timestamp('updated_at').defaultNow(),
  },
  (table) => ({
    postIdIdx: index('comments_post_id_idx').on(table.postId),
    userIdIdx: index('comments_user_id_idx').on(table.userId),
    parentIdIdx: index('comments_parent_id_idx').on(table.parentId),
  })
);

/**
 * Tags Table
 *
 * Tags for categorizing posts.
 */
export const tags = pgTable('tags', {
  id: serial('id').primaryKey(),
  name: varchar('name', { length: 100 }).notNull().unique(),
  slug: varchar('slug', { length: 100 }).notNull().unique(),
  createdAt: timestamp('created_at').defaultNow(),
});

/**
 * PostTags Junction Table
 *
 * Many-to-many relationship between posts and tags.
 */
export const postTags = pgTable(
  'post_tags',
  {
    postId: integer('post_id')
      .notNull()
      .references(() => posts.id, { onDelete: 'cascade' }),
    tagId: integer('tag_id')
      .notNull()
      .references(() => tags.id, { onDelete: 'cascade' }),
  },
  (table) => ({
    pk: { name: 'post_tags_pk', columns: [table.postId, table.tagId] },
    postIdIdx: index('post_tags_post_id_idx').on(table.postId),
    tagIdIdx: index('post_tags_tag_id_idx').on(table.tagId),
  })
);

/**
 * Settings Table
 *
 * Application-wide or user-specific settings stored as JSON.
 */
export const settings = pgTable('settings', {
  id: serial('id').primaryKey(),
  userId: integer('user_id').references(() => users.id, {
    onDelete: 'cascade',
  }), // null = global settings
  key: varchar('key', { length: 255 }).notNull(),
  value: json('value'),
  createdAt: timestamp('created_at').defaultNow(),
  updatedAt: timestamp('updated_at').defaultNow(),
});

// ============================================================================
// Relations (optional but recommended for better type safety)
// ============================================================================

export const usersRelations = relations(users, ({ many, one }) => ({
  profile: one(profiles),
  posts: many(posts),
  comments: many(comments),
}));

export const profilesRelations = relations(profiles, ({ one }) => ({
  user: one(users, {
    fields: [profiles.userId],
    references: [users.id],
  }),
}));

export const postsRelations = relations(posts, ({ one, many }) => ({
  author: one(users, {
    fields: [posts.userId],
    references: [users.id],
  }),
  comments: many(comments),
  tags: many(postTags),
}));

export const commentsRelations = relations(comments, ({ one, many }) => ({
  post: one(posts, {
    fields: [comments.postId],
    references: [posts.id],
  }),
  author: one(users, {
    fields: [comments.userId],
    references: [users.id],
  }),
  parent: one(comments, {
    fields: [comments.parentId],
    references: [comments.id],
  }),
  replies: many(comments),
}));

export const tagsRelations = relations(tags, ({ many }) => ({
  posts: many(postTags),
}));

export const postTagsRelations = relations(postTags, ({ one }) => ({
  post: one(posts, {
    fields: [postTags.postId],
    references: [posts.id],
  }),
  tag: one(tags, {
    fields: [postTags.tagId],
    references: [tags.id],
  }),
}));