const path = require('path');
const Database = require('better-sqlite3');
const sqliteVec = require('sqlite-vec');
const config = require('./config');

const dbPath = path.resolve(__dirname, '..', config.database.path || './archive.sqlite');
const db = new Database(dbPath);
sqliteVec.load(db);

db.pragma('journal_mode = WAL');

db.exec(`
  CREATE TABLE IF NOT EXISTS articles (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    title TEXT NOT NULL,
    description TEXT,
    content TEXT,
    image TEXT,
    content_status TEXT,
    content_error TEXT,
    content_attempted_at TEXT,
    content_attempt_count INTEGER NOT NULL DEFAULT 0,
    content_retry_after TEXT,
    is_index_page INTEGER NOT NULL DEFAULT 0,
    has_embedding INTEGER NOT NULL DEFAULT 0,
    url TEXT NOT NULL UNIQUE,
    normalized_title TEXT NOT NULL,
    source TEXT NOT NULL,
    pub_date TEXT,
    pub_date_effective TEXT,
    language TEXT,
    event_id INTEGER REFERENCES events(id),
    ingested_at TEXT NOT NULL DEFAULT (datetime('now'))
  );
`);

db.exec(`
  CREATE INDEX IF NOT EXISTS idx_articles_source ON articles(source);
  CREATE INDEX IF NOT EXISTS idx_articles_pub_date ON articles(pub_date);
  CREATE INDEX IF NOT EXISTS idx_articles_ingested_at ON articles(ingested_at);
  CREATE INDEX IF NOT EXISTS idx_articles_normalized_title ON articles(normalized_title);
  CREATE INDEX IF NOT EXISTS idx_articles_event_id ON articles(event_id);
  CREATE INDEX IF NOT EXISTS idx_articles_has_embedding ON articles(has_embedding);
  CREATE INDEX IF NOT EXISTS idx_articles_pub_date_effective ON articles(pub_date_effective DESC);
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS article_embedding_store (
    article_id INTEGER NOT NULL,
    model TEXT NOT NULL,
    embedding BLOB NOT NULL,
    embedded_at TEXT NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (article_id, model)
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS article_embedding_meta (
    article_id INTEGER PRIMARY KEY,
    model TEXT NOT NULL,
    embedded_at TEXT NOT NULL DEFAULT (datetime('now'))
  );
`);

db.exec(`
  CREATE VIRTUAL TABLE IF NOT EXISTS article_embeddings USING vec0(
    article_id INTEGER PRIMARY KEY,
    embedding FLOAT[8192]
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS query_embeddings (
    query TEXT NOT NULL,
    model TEXT NOT NULL,
    embedding BLOB NOT NULL,
    created_at TEXT NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (query, model)
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS events (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    title TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS gdelt_backfill_windows (
    source_id TEXT NOT NULL,
    window_start TEXT NOT NULL,
    window_end TEXT NOT NULL,
    completed_at TEXT NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (source_id, window_start, window_end)
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS crawler_page_classifications (
    url TEXT PRIMARY KEY,
    site_name TEXT NOT NULL,
    classification TEXT NOT NULL,
    pattern TEXT,
    classified_at TEXT NOT NULL DEFAULT (datetime('now'))
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS crawler_url_patterns (
    site_name TEXT NOT NULL,
    pattern TEXT NOT NULL,
    classification TEXT NOT NULL,
    hit_count INTEGER NOT NULL DEFAULT 1,
    updated_at TEXT NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (site_name, pattern)
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS crawler_site_rules (
    site_name TEXT NOT NULL,
    rule_type TEXT NOT NULL,
    rule_value TEXT NOT NULL,
    classification TEXT NOT NULL,
    hit_count INTEGER NOT NULL DEFAULT 1,
    updated_at TEXT NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (site_name, rule_type, rule_value)
  );
`);

db.exec(`
  CREATE TABLE IF NOT EXISTS domain_fetch_policy (
    domain TEXT PRIMARY KEY,
    policy TEXT NOT NULL DEFAULT 'auto',
    consecutive_plain_failures INTEGER NOT NULL DEFAULT 0,
    consecutive_browser_failures INTEGER NOT NULL DEFAULT 0,
    plain_success_count INTEGER NOT NULL DEFAULT 0,
    browser_success_count INTEGER NOT NULL DEFAULT 0,
    expires_at TEXT,
    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
  );
`);

module.exports = db;