import Database from 'better-sqlite3';
import path from 'path';

const db = new Database(path.join(process.cwd(), 'autotrader.sqlite'));

db.pragma('foreign_keys = ON');

db.exec(`
    CREATE TABLE IF NOT EXISTS firms (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT NOT NULL UNIQUE,
        username TEXT NOT NULL,
        password TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS account_configs (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        firm_id INTEGER NOT NULL REFERENCES firms(id) ON DELETE CASCADE,
        prefix TEXT NOT NULL,
        profit_target REAL NOT NULL DEFAULT 3000,
        consistency REAL NOT NULL DEFAULT 0.5,
        min_day_pnl REAL NOT NULL DEFAULT -999,
        min_trading_days INTEGER NOT NULL DEFAULT 5
    );

    CREATE TABLE IF NOT EXISTS instruments (
        symbol  TEXT    PRIMARY KEY,
        enabled INTEGER NOT NULL DEFAULT 1
    );
`);

// Migration: add account_size column if it doesn't exist yet
try {
    db.exec('ALTER TABLE account_configs ADD COLUMN account_size REAL NOT NULL DEFAULT 50000');
} catch {
    // Column already exists
}

// Migration: add max_loss column (0 = no max loss limit)
try {
    db.exec('ALTER TABLE account_configs ADD COLUMN max_loss REAL NOT NULL DEFAULT 0');
} catch {
    // Column already exists
}

// Migration: add max_position_size column (0 = no limit)
try {
    db.exec('ALTER TABLE account_configs ADD COLUMN max_position_size INTEGER NOT NULL DEFAULT 0');
} catch {
    // Column already exists
}



// ── Interfaces ─────────────────────────────────────────────────────────────

export interface AccountConfigRow {
    id: number;
    firm_id: number;
    prefix: string;
    profit_target: number;
    consistency: number;
    min_day_pnl: number;
    min_trading_days: number;
    account_size: number;
    max_loss: number;
    max_position_size: number;
}

export interface FirmRow {
    id: number;
    name: string;
    username: string;
    password: string;
}

export interface FirmWithAccounts extends FirmRow {
    accounts: AccountConfigRow[];
}

// ── Firms ───────────────────────────────────────────────────────────────────

export function getFirms(): FirmWithAccounts[] {
    const firms = db.prepare('SELECT * FROM firms ORDER BY id').all() as FirmRow[];
    const getAccounts = db.prepare('SELECT * FROM account_configs WHERE firm_id = ? ORDER BY id');
    return firms.map((firm) => ({
        ...firm,
        accounts: getAccounts.all(firm.id) as AccountConfigRow[],
    }));
}

export function getFirmById(id: number): FirmWithAccounts | undefined {
    const firm = db.prepare('SELECT * FROM firms WHERE id = ?').get(id) as FirmRow | undefined;
    if (!firm) return undefined;
    const accounts = db.prepare('SELECT * FROM account_configs WHERE firm_id = ? ORDER BY id').all(id) as AccountConfigRow[];
    return { ...firm, accounts };
}

export function createFirm(name: string, username: string, password: string): FirmRow {
    const stmt = db.prepare('INSERT INTO firms (name, username, password) VALUES (?, ?, ?)');
    const result = stmt.run(name, username, password);
    return db.prepare('SELECT * FROM firms WHERE id = ?').get(result.lastInsertRowid) as FirmRow;
}

export function deleteFirm(id: number): boolean {
    const result = db.prepare('DELETE FROM firms WHERE id = ?').run(id);
    return result.changes > 0;
}

// ── Account Configs ─────────────────────────────────────────────────────────

export function createAccountConfig(firmId: number, data: {
    prefix: string;
    profitTarget: number;
    consistency: number;
    minDayPnL: number;
    minTradingDays: number;
    accountSize: number;
    maxLoss: number;
    maxPositionSize: number;
}): AccountConfigRow {
    const stmt = db.prepare(
        'INSERT INTO account_configs (firm_id, prefix, profit_target, consistency, min_day_pnl, min_trading_days, account_size, max_loss, max_position_size) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)'
    );
    const result = stmt.run(firmId, data.prefix, data.profitTarget, data.consistency, data.minDayPnL, data.minTradingDays, data.accountSize, data.maxLoss, data.maxPositionSize);
    return db.prepare('SELECT * FROM account_configs WHERE id = ?').get(result.lastInsertRowid) as AccountConfigRow;
}

export function deleteAccountConfig(id: number): boolean {
    const result = db.prepare('DELETE FROM account_configs WHERE id = ?').run(id);
    return result.changes > 0;
}

export function updateAccountConfig(id: number, data: {
    prefix: string;
    profitTarget: number;
    consistency: number;
    minDayPnL: number;
    minTradingDays: number;
    accountSize: number;
    maxLoss: number;
    maxPositionSize: number;
}): boolean {
    const result = db.prepare(`
        UPDATE account_configs
        SET prefix = ?, profit_target = ?, consistency = ?, min_day_pnl = ?, min_trading_days = ?, account_size = ?, max_loss = ?, max_position_size = ?
        WHERE id = ?
    `).run(data.prefix, data.profitTarget, data.consistency, data.minDayPnL, data.minTradingDays, data.accountSize, data.maxLoss, data.maxPositionSize, id);
    return result.changes > 0;
}

// ── Settings ─────────────────────────────────────────────────────────────────

db.exec(`
    CREATE TABLE IF NOT EXISTS settings (
        key   TEXT PRIMARY KEY,
        value TEXT NOT NULL
    );
`);

// Seed defaults if missing
const seedSetting = db.prepare(`INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)`);
seedSetting.run('max_concurrent_accounts', '5');
seedSetting.run('tick_interval_seconds', '60');

export function getSetting(key: string): string | null {
    const row = db.prepare('SELECT value FROM settings WHERE key = ?').get(key) as { value: string } | undefined;
    return row?.value ?? null;
}

export function setSetting(key: string, value: string): void {
    db.prepare(`INSERT INTO settings (key, value) VALUES (?, ?) ON CONFLICT(key) DO UPDATE SET value = excluded.value`).run(key, value);
}

// ── Instruments ──────────────────────────────────────────────────────────────

const SYMBOLS = ['NQ','MNQ','ES','MES','YM','MYM','RTY','M2K','GC','MGC','SI','CL','MCL','NG','ZB','ZN','ZF','6E','6J','6B'];

// Seed instruments table if empty
const instrCount = (db.prepare('SELECT COUNT(*) as count FROM instruments').get() as { count: number }).count;
if (instrCount === 0) {
    const ins = db.prepare('INSERT INTO instruments (symbol, enabled) VALUES (?, 1)');
    for (const s of SYMBOLS) ins.run(s);
}

export interface InstrumentRow {
    symbol: string;
    enabled: boolean;
}

export function getInstruments(): InstrumentRow[] {
    return (db.prepare('SELECT symbol, enabled FROM instruments ORDER BY symbol').all() as { symbol: string; enabled: number }[])
        .map((r) => ({ symbol: r.symbol, enabled: r.enabled === 1 }));
}

export function setInstrumentEnabled(symbol: string, enabled: boolean): boolean {
    const result = db.prepare('UPDATE instruments SET enabled = ? WHERE symbol = ?').run(enabled ? 1 : 0, symbol);
    return result.changes > 0;
}

// ── Firm banned symbols ───────────────────────────────────────────────────────

db.exec(`
    CREATE TABLE IF NOT EXISTS firm_banned_symbols (
        firm_id INTEGER NOT NULL REFERENCES firms(id) ON DELETE CASCADE,
        symbol  TEXT    NOT NULL,
        PRIMARY KEY (firm_id, symbol)
    );
`);

export function getBannedSymbols(firmId: number): string[] {
    return (db.prepare('SELECT symbol FROM firm_banned_symbols WHERE firm_id = ? ORDER BY symbol').all(firmId) as { symbol: string }[])
        .map((r) => r.symbol);
}

export function isSymbolBanned(firmId: number, symbol: string): boolean {
    return !!db.prepare('SELECT 1 FROM firm_banned_symbols WHERE firm_id = ? AND symbol = ?').get(firmId, symbol);
}

export function setBannedSymbol(firmId: number, symbol: string, banned: boolean): void {
    if (banned) {
        db.prepare('INSERT OR IGNORE INTO firm_banned_symbols (firm_id, symbol) VALUES (?, ?)').run(firmId, symbol);
    } else {
        db.prepare('DELETE FROM firm_banned_symbols WHERE firm_id = ? AND symbol = ?').run(firmId, symbol);
    }
}