const { Pool } = require('pg');
const config = require('../config');

const pool = new Pool(config.db);

pool.on('error', (err) => {
  console.error('[DB] Unexpected error on idle client', err);
});

const query = (text, params) => pool.query(text, params);

const migrate = async () => {
  // users — расширили под план/api_key/баланс
  await query(`
    CREATE TABLE IF NOT EXISTS users (
      id          SERIAL PRIMARY KEY,
      email       VARCHAR(255) UNIQUE NOT NULL,
      password    TEXT NOT NULL,
      name        VARCHAR(255),
      plan        VARCHAR(20) DEFAULT 'free',
      api_key     VARCHAR(64) UNIQUE,
      tokens_used BIGINT DEFAULT 0,
      created_at  TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // channels — базовые настройки канала
  await query(`
    CREATE TABLE IF NOT EXISTS channels (
      id            SERIAL PRIMARY KEY,
      user_id       INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
      name          VARCHAR(255) NOT NULL,
      tg_channel_id VARCHAR(255),
      tg_username   VARCHAR(255),
      bot_token     TEXT,
      niche         TEXT,                                  -- узкая тематика
      audience      TEXT,                                  -- описание ЦА
      goal          VARCHAR(50) DEFAULT 'educational',     -- educational/news/entertainment/expert/sales
      language      VARCHAR(10) DEFAULT 'ru',
      region        VARCHAR(50) DEFAULT 'ru',              -- ru/cis/west
      is_active     BOOLEAN DEFAULT true,
      created_at    TIMESTAMPTZ DEFAULT NOW(),
      updated_at    TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // channel_style — стилевые настройки (1:1 с channels)
  await query(`
    CREATE TABLE IF NOT EXISTS channel_style (
      channel_id     INTEGER PRIMARY KEY REFERENCES channels(id) ON DELETE CASCADE,
      tone           VARCHAR(50) DEFAULT 'friendly',       -- friendly/serious/ironic/provocative/academic/custom
      tone_custom    TEXT,                                 -- если tone='custom'
      formality      VARCHAR(20) DEFAULT 'informal',       -- formal(вы)/informal(ты)
      humor          VARCHAR(20) DEFAULT 'moderate',       -- none/dry/moderate/playful
      post_length    VARCHAR(20) DEFAULT 'medium',         -- short(<300)/medium(300-800)/long(800-2000)
      structure      VARCHAR(50) DEFAULT 'mixed',          -- plain/lists/headers/mixed
      emoji_level    VARCHAR(20) DEFAULT 'moderate',       -- none/moderate/active
      hashtags_mode  VARCHAR(20) DEFAULT 'end',            -- none/end/inline
      cta_mode       VARCHAR(20) DEFAULT 'sometimes',      -- always/sometimes/never
      example_posts  JSONB DEFAULT '[]'::jsonb,            -- массив строк-эталонов (few-shot)
      banned_words   JSONB DEFAULT '[]'::jsonb,            -- стоп-слова
      banned_topics  JSONB DEFAULT '[]'::jsonb,            -- запрещённые темы
      expertise      JSONB DEFAULT '[]'::jsonb,            -- темы где автор силён
      updated_at     TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // channel_schedule — расписание и рубрики
  await query(`
    CREATE TABLE IF NOT EXISTS channel_schedule (
      channel_id     INTEGER PRIMARY KEY REFERENCES channels(id) ON DELETE CASCADE,
      posts_per_day  INTEGER DEFAULT 1,
      time_slots     JSONB DEFAULT '[]'::jsonb,            -- ["09:00","18:00"]
      timezone       VARCHAR(50) DEFAULT 'Europe/Moscow',
      rubrics        JSONB DEFAULT '[]'::jsonb,            -- [{name,description,days:[1,3,5]}]
      sources        JSONB DEFAULT '[]'::jsonb,            -- [{type:'rss',url:'...'},{type:'tg',channel:'@...'}]
      auto_publish   BOOLEAN DEFAULT false,                -- авто-постинг без подтверждения
      updated_at     TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // generation_jobs — задачи генерации
  await query(`
    CREATE TABLE IF NOT EXISTS generation_jobs (
      id          SERIAL PRIMARY KEY,
      user_id     INTEGER REFERENCES users(id) ON DELETE SET NULL,
      channel_id  INTEGER REFERENCES channels(id) ON DELETE SET NULL,
      type        VARCHAR(50) NOT NULL,                    -- post/article/topics/rewrite
      topic       TEXT,
      rubric      VARCHAR(255),
      prompt_debug TEXT,                                   -- финальный промпт для отладки
      result      TEXT,
      tokens_in   INTEGER,
      tokens_out  INTEGER,
      cost_cents  INTEGER DEFAULT 0,
      status      VARCHAR(20) DEFAULT 'pending',
      error       TEXT,
      metadata    JSONB DEFAULT '{}'::jsonb,
      created_at  TIMESTAMPTZ DEFAULT NOW(),
      updated_at  TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // posts — готовые посты (черновики и опубликованные)
  await query(`
    CREATE TABLE IF NOT EXISTS posts (
      id            SERIAL PRIMARY KEY,
      channel_id    INTEGER REFERENCES channels(id) ON DELETE CASCADE,
      job_id        INTEGER REFERENCES generation_jobs(id) ON DELETE SET NULL,
      content       TEXT NOT NULL,
      image_url     TEXT,
      status        VARCHAR(20) DEFAULT 'draft',           -- draft/scheduled/published/failed
      scheduled_at  TIMESTAMPTZ,
      published_at  TIMESTAMPTZ,
      tg_message_id BIGINT,
      metadata      JSONB DEFAULT '{}'::jsonb,
      created_at    TIMESTAMPTZ DEFAULT NOW(),
      updated_at    TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // articles — статьи для публичного блога zeropost.ru
  await query(`
    CREATE TABLE IF NOT EXISTS articles (
      id           SERIAL PRIMARY KEY,
      slug         VARCHAR(255) UNIQUE NOT NULL,
      title        VARCHAR(500) NOT NULL,
      excerpt      TEXT,
      content      TEXT NOT NULL,
      cover_url    TEXT,
      tags         JSONB DEFAULT '[]'::jsonb,
      author       VARCHAR(100) DEFAULT 'ZeroPost AI',
      reading_time INTEGER,
      status       VARCHAR(20) DEFAULT 'published',
      views        INTEGER DEFAULT 0,
      seo_title    VARCHAR(500),
      seo_descr    TEXT,
      job_id       INTEGER REFERENCES generation_jobs(id) ON DELETE SET NULL,
      published_at TIMESTAMPTZ DEFAULT NOW(),
      created_at   TIMESTAMPTZ DEFAULT NOW(),
      updated_at   TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // editor_notes — короткие заметки от редактора-человека
  await query(`
    CREATE TABLE IF NOT EXISTS editor_notes (
      id          SERIAL PRIMARY KEY,
      title       VARCHAR(255),
      content     TEXT NOT NULL,
      author      VARCHAR(100) DEFAULT 'Редактор',
      tags        JSONB DEFAULT '[]'::jsonb,
      is_pinned   BOOLEAN DEFAULT false,
      is_published BOOLEAN DEFAULT true,
      created_at  TIMESTAMPTZ DEFAULT NOW(),
      updated_at  TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // series — тематические серии статей
  await query(`
    CREATE TABLE IF NOT EXISTS series (
      id          SERIAL PRIMARY KEY,
      slug        VARCHAR(120) UNIQUE NOT NULL,
      title       VARCHAR(255) NOT NULL,
      intro       TEXT,
      icon        VARCHAR(40),
      color       VARCHAR(20) DEFAULT 'emerald',
      article_ids JSONB DEFAULT '[]'::jsonb,
      is_featured BOOLEAN DEFAULT false,
      sort_order  INTEGER DEFAULT 0,
      created_at  TIMESTAMPTZ DEFAULT NOW(),
      updated_at  TIMESTAMPTZ DEFAULT NOW()
    );
  `);

  // индексы
  await query(`
    CREATE INDEX IF NOT EXISTS idx_channels_user ON channels(user_id);
    CREATE INDEX IF NOT EXISTS idx_posts_channel ON posts(channel_id);
    CREATE INDEX IF NOT EXISTS idx_posts_scheduled ON posts(scheduled_at) WHERE status='scheduled';
    CREATE INDEX IF NOT EXISTS idx_jobs_status ON generation_jobs(status);
    CREATE INDEX IF NOT EXISTS idx_jobs_user ON generation_jobs(user_id);
    CREATE INDEX IF NOT EXISTS idx_articles_slug ON articles(slug);
    CREATE INDEX IF NOT EXISTS idx_articles_status_pub ON articles(status, published_at DESC);
    CREATE INDEX IF NOT EXISTS idx_notes_pub ON editor_notes(is_published, created_at DESC);
    CREATE INDEX IF NOT EXISTS idx_series_slug ON series(slug);
  `);

  console.log('[DB] Migrations applied');
};

module.exports = { query, migrate };