import { drizzle } from "drizzle-orm/node-postgres";
import { eq } from "drizzle-orm";
import { users, customSymbols, User, NewUser, CustomSymbol, NewCustomSymbol } from "../shared/schema";
import { Pool } from "pg";

// PostgreSQL connection (local on production droplet)
const pool = new Pool({
  host: process.env.DB_HOST || "127.0.0.1",
  port: parseInt(process.env.DB_PORT || "5432"),
  user: process.env.DB_USER || "gn_admin",
  password: process.env.DB_PASSWORD || "",
  database: process.env.DB_NAME || "gammanexus",
  ssl: (process.env.DB_SSL === "true" && process.env.NODE_ENV === "production") ? { rejectUnauthorized: false } : false,
  max: 20,
  idleTimeoutMillis: 30000,
  connectionTimeoutMillis: 5000,
});

export const db = drizzle(pool);

// Use raw pool client for DDL — Drizzle wraps queries in prepared statements
// and PostgreSQL rejects CREATE/ALTER IF NOT EXISTS in prepared queries.
async function executeDDL(query: string): Promise<void> {
  const client = await pool.connect();
  try {
    await client.query(query);
  } catch {
    // Table/column already exists — ignore silently
  } finally {
    client.release();
  }
}

// Initialize users table if it doesn't exist (called at startup)
export async function initDb(): Promise<void> {
  await executeDDL(`
    CREATE TABLE IF NOT EXISTS users (
      id SERIAL PRIMARY KEY,
      name TEXT NOT NULL,
      email TEXT NOT NULL UNIQUE,
      password_hash TEXT NOT NULL,
      email_verified BOOLEAN NOT NULL DEFAULT FALSE,
      verification_token TEXT,
      verification_token_expiry TIMESTAMP WITH TIME ZONE,
      created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
    )
  `);

  // Add columns if they don't exist (for existing tables)
  await executeDDL(`ALTER TABLE users ADD COLUMN email_verified BOOLEAN NOT NULL DEFAULT FALSE`);
  await executeDDL(`ALTER TABLE users ADD COLUMN verification_token TEXT`);
  await executeDDL(`ALTER TABLE users ADD COLUMN verification_token_expiry TIMESTAMP WITH TIME ZONE`);

  // Create custom_symbols table
  await executeDDL(`
    CREATE TABLE IF NOT EXISTS custom_symbols (
      id SERIAL PRIMARY KEY,
      ticker TEXT NOT NULL UNIQUE,
      name TEXT NOT NULL,
      type TEXT NOT NULL DEFAULT 'etf',
      sector TEXT,
      user_id TEXT,
      created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
    )
  `);
}

export async function createUser(data: NewUser): Promise<User> {
  const [user] = await db.insert(users).values(data).returning();
  return user;
}

export async function getUserByEmail(email: string): Promise<User | undefined> {
  const result = await db.select().from(users).where(eq(users.email, email.toLowerCase()));
  return result[0];
}

export async function getUserById(id: number): Promise<User | undefined> {
  const result = await db.select().from(users).where(eq(users.id, id));
  return result[0];
}

export async function updateUser(id: number, data: Partial<Pick<User, "name" | "email">>): Promise<User> {
  const result = await db.update(users).set(data).where(eq(users.id, id)).returning();
  return result[0];
}

export async function updateUserPassword(id: number, passwordHash: string): Promise<User> {
  const result = await db.update(users).set({ passwordHash }).where(eq(users.id, id)).returning();
  return result[0];
}

export async function updateUserVerification(id: number, token: string, expiry: Date): Promise<void> {
  await db.update(users).set({ verificationToken: token, verificationTokenExpiry: expiry }).where(eq(users.id, id));
}

export async function getUserByVerificationToken(token: string): Promise<User | undefined> {
  const { and, eq, gt } = await import("drizzle-orm");
  const result = await db.select().from(users).where(
    and(
      eq(users.verificationToken, token),
      gt(users.verificationTokenExpiry, new Date())
    )
  );
  return result[0];
}

export async function markEmailVerified(id: number): Promise<void> {
  await db.update(users).set({ emailVerified: true, verificationToken: null, verificationTokenExpiry: null }).where(eq(users.id, id));
}

// ---------------------------------------------------------------------------
// Custom Symbols CRUD
// ---------------------------------------------------------------------------

export async function getAllCustomSymbols(): Promise<CustomSymbol[]> {
  return await db.select().from(customSymbols);
}

export async function getCustomSymbolByTicker(ticker: string): Promise<CustomSymbol | undefined> {
  const result = await db.select().from(customSymbols).where(eq(customSymbols.ticker, ticker.toUpperCase()));
  return result[0];
}

export async function createCustomSymbol(data: NewCustomSymbol): Promise<CustomSymbol> {
  const [symbol] = await db.insert(customSymbols).values({
    ...data,
    ticker: data.ticker?.toUpperCase() || data.ticker,
  }).returning();
  return symbol;
}

export async function deleteCustomSymbol(ticker: string): Promise<boolean> {
  const result = await db.delete(customSymbols).where(eq(customSymbols.ticker, ticker.toUpperCase())).returning();
  return result.length > 0;
}