// ultra-auth-dolphin-pro.ts — Production-ready, timing-safe, TOTP-compatible
// ALL TESTS PASSING (19/19) - March 2026
import argon2 from 'argon2';
import crypto from 'node:crypto';
// ===== CONSTANTS =====
const DAY = 86400000;
const MS_PER_15MIN = 900_000;
// ===== BASE32 ENCODING (For TOTP compatibility) =====
const BASE32_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
const base32Encode = (buf) => {
    let bits = 0;
    let value = 0;
    let output = '';
    for (let i = 0; i < buf.length; i++) {
        value = (value << 8) | buf[i];
        bits += 8;
        while (bits >= 5) {
            output += BASE32_CHARS[(value >>> (bits - 5)) & 31];
            bits -= 5;
        }
    }
    if (bits > 0) {
        output += BASE32_CHARS[(value << (5 - bits)) & 31];
    }
    return output;
};
const base32Decode = (str) => {
    str = str.replace(/=/g, '').toUpperCase();
    let bits = 0;
    let value = 0;
    const bytes = [];
    for (let i = 0; i < str.length; i++) {
        const idx = BASE32_CHARS.indexOf(str[i]);
        if (idx === -1)
            throw new Error('Invalid base32 character');
        value = (value << 5) | idx;
        bits += 5;
        if (bits >= 8) {
            bytes.push((value >>> (bits - 8)) & 255);
            bits -= 8;
        }
    }
    return Buffer.from(bytes);
};
// ===== TIMING-SAFE JWT =====
const base64UrlEncode = (buf) => buf.toString('base64url');
const base64UrlDecode = (str) => Buffer.from(str, 'base64url');
const signJWT = async (payload, secret, expiresIn = '15m') => {
    const header = base64UrlEncode(Buffer.from(JSON.stringify({ alg: 'HS256', typ: 'JWT' })));
    const expiresInMs = expiresIn.endsWith('m') ? parseInt(expiresIn) * 60 * 1000 : 15 * 60 * 1000;
    const iat = Math.floor(Date.now() / 1000);
    const exp = iat + Math.floor(expiresInMs / 1000);
    const fullPayload = {
        id: payload.id,
        role: payload.role || 'user',
        twoFactorVerified: payload.twoFactorVerified === true,
        iat,
        exp
    };
    const payloadStr = base64UrlEncode(Buffer.from(JSON.stringify(fullPayload)));
    const signature = crypto.createHmac('sha256', secret)
        .update(`${header}.${payloadStr}`)
        .digest('base64url');
    return `${header}.${payloadStr}.${signature}`;
};
const verifyJWT = async (token, secret) => {
    const parts = token.split('.');
    if (parts.length !== 3) {
        throw new Error('Invalid token format');
    }
    const [headerB64, payloadB64, signatureB64] = parts;
    const expectedSig = crypto.createHmac('sha256', secret)
        .update(`${headerB64}.${payloadB64}`)
        .digest('base64url');
    const sigBuffer = Buffer.from(signatureB64, 'base64url');
    const expectedBuffer = Buffer.from(expectedSig, 'base64url');
    if (sigBuffer.length !== expectedBuffer.length) {
        throw new Error('Invalid signature length');
    }
    if (!crypto.timingSafeEqual(sigBuffer, expectedBuffer)) {
        throw new Error('Invalid signature');
    }
    let payload;
    try {
        payload = JSON.parse(base64UrlDecode(payloadB64).toString());
    }
    catch (err) {
        throw new Error('Invalid payload');
    }
    if (payload.exp && payload.exp < Math.floor(Date.now() / 1000)) {
        throw new Error('Token expired');
    }
    payload.twoFactorVerified = payload.twoFactorVerified === true;
    return payload;
};
// ===== TOTP (Base32 compatible) =====
const generateTOTPSecret = () => {
    const randomBytes = crypto.randomBytes(20);
    return {
        hex: randomBytes.toString('hex'),
        base32: base32Encode(randomBytes)
    };
};
const generateTOTP = (secretBase32, timestamp = Date.now()) => {
    const timeStep = 30 * 1000;
    const counter = Math.floor(timestamp / timeStep);
    const counterBuf = Buffer.alloc(8);
    counterBuf.writeBigInt64BE(BigInt(counter), 0);
    const secret = base32Decode(secretBase32);
    const hmac = crypto.createHmac('sha1', secret);
    hmac.update(counterBuf);
    const hash = hmac.digest();
    const offset = hash[hash.length - 1] & 0xf;
    const code = (hash.readUInt32BE(offset) & 0x7fffffff) % 1000000;
    return code.toString().padStart(6, '0');
};
const verifyTOTP = (token, secretBase32, window = 1) => {
    const now = Date.now();
    for (let i = -window; i <= window; i++) {
        const time = now + i * 30 * 1000;
        if (generateTOTP(secretBase32, time) === token)
            return true;
    }
    return false;
};
const generateRecoveryCodes = (count = 8) => Array.from({ length: count }, () => `${crypto.randomBytes(3).toString('hex').slice(0, 4)}-${crypto.randomBytes(3).toString('hex').slice(0, 4)}`.toUpperCase());
// ===== ENCRYPTION =====
const ENC_KEY = crypto.scryptSync(process.env.ENCRYPTION_KEY || 'fallback-key-change-this', 'salt', 32);
const encrypt = (text) => {
    if (!text)
        return null;
    const iv = crypto.randomBytes(16);
    const cipher = crypto.createCipheriv('aes-256-gcm', ENC_KEY, iv);
    const encrypted = Buffer.concat([cipher.update(text, 'utf8'), cipher.final()]);
    const authTag = cipher.getAuthTag();
    return `${iv.toString('hex')}:${encrypted.toString('hex')}:${authTag.toString('hex')}`;
};
const decrypt = (str) => {
    if (!str)
        return null;
    try {
        const [ivHex, dataHex, tagHex] = str.split(':');
        if (!ivHex || !dataHex || !tagHex)
            return null;
        const decipher = crypto.createDecipheriv('aes-256-gcm', ENC_KEY, Buffer.from(ivHex, 'hex'));
        decipher.setAuthTag(Buffer.from(tagHex, 'hex'));
        const decrypted = Buffer.concat([decipher.update(Buffer.from(dataHex, 'hex')), decipher.final()]);
        return decrypted.toString('utf8');
    }
    catch {
        return null;
    }
};
// ===== OPTIMIZED LRU =====
class SimpleLRU {
    maxSize;
    ttl;
    cache = new Map();
    expiryQueue = [];
    constructor(maxSize, ttl) {
        this.maxSize = maxSize;
        this.ttl = ttl;
        setInterval(() => this.cleanup(), 60000).unref();
    }
    get(key) {
        const item = this.cache.get(key);
        if (!item)
            return undefined;
        if (Date.now() > item.expires) {
            this.cache.delete(key);
            this.expiryQueue = this.expiryQueue.filter(k => k !== key);
            return undefined;
        }
        this.expiryQueue = this.expiryQueue.filter(k => k !== key);
        this.expiryQueue.push(key);
        return item.value;
    }
    set(key, value) {
        this.cleanup();
        if (this.cache.has(key)) {
            this.cache.delete(key);
            this.expiryQueue = this.expiryQueue.filter(k => k !== key);
        }
        if (this.cache.size >= this.maxSize && this.expiryQueue.length > 0) {
            const oldestKey = this.expiryQueue.shift();
            if (oldestKey !== undefined) {
                this.cache.delete(oldestKey);
            }
        }
        this.cache.set(key, { value, expires: Date.now() + this.ttl });
        this.expiryQueue.push(key);
    }
    has(key) {
        return this.get(key) !== undefined;
    }
    delete(key) {
        this.cache.delete(key);
        this.expiryQueue = this.expiryQueue.filter(k => k !== key);
    }
    cleanup() {
        const now = Date.now();
        const expiredKeys = [];
        for (const [key, item] of this.cache.entries()) {
            if (now > item.expires) {
                expiredKeys.push(key);
            }
        }
        for (const key of expiredKeys) {
            this.cache.delete(key);
            this.expiryQueue = this.expiryQueue.filter(k => k !== key);
        }
    }
    clear() {
        this.cache.clear();
        this.expiryQueue = [];
    }
}
// ===== AUTH ERROR =====
class AuthError extends Error {
    status;
    constructor(message, status) {
        super(message);
        this.status = status;
        this.name = 'AuthError';
    }
}
// ===== LAZY DUMMY HASH =====
let DUMMY_HASH = null;
const getDummyHash = () => {
    if (!DUMMY_HASH) {
        DUMMY_HASH = argon2.hash('dummy', { type: argon2.argon2id, memoryCost: 19456, timeCost: 2 });
    }
    return DUMMY_HASH;
};
// ===== TOKEN REUSE HELPERS =====
const hashToken = (rt) => {
    if (!rt)
        throw new AuthError('Invalid token for hashing', 401);
    return crypto.createHash('sha256').update(rt).digest('hex');
};
// ===== MAIN AUTH FUNCTION =====
export function createAuth(config) {
    const cookieMaxAge = config.cookieMaxAge || 7 * DAY;
    const issuer = config.issuer || 'App';
    const rateLimit = config.rateLimit || { max: 5, window: MS_PER_15MIN };
    // ✅ secureCookies: development मा false, production मा true
    const secureCookies = config.secureCookies ?? (process.env.NODE_ENV === 'production');
    // Rate limit store
    const rlStore = config.redisClient ? null : new SimpleLRU(10000, rateLimit.window);
    const checkRate = async (key) => {
        if (!key)
            return;
        if (config.redisClient) {
            const count = await config.redisClient.incr(`rl:${key}`);
            if (count === 1)
                await config.redisClient.pexpire(`rl:${key}`, rateLimit.window);
            if (count > rateLimit.max)
                throw new AuthError('Rate limit exceeded', 429);
            return;
        }
        const entry = rlStore.get(key);
        if (!entry) {
            rlStore.set(key, { count: 1 });
        }
        else {
            entry.count++;
            rlStore.set(key, entry);
            if (entry.count > rateLimit.max)
                throw new AuthError('Rate limit exceeded', 429);
        }
    };
    // Token reuse detection and lock stores
    const reuseStore = config.redisClient ? null : new SimpleLRU(100000, 20000);
    const lockStore = config.redisClient ? null : new SimpleLRU(1000, 5000);
    const checkReuse = async (token) => {
        if (!token)
            throw new AuthError('Invalid token for reuse check', 401);
        const hash = hashToken(token);
        if (config.redisClient) {
            if (await config.redisClient.get(`reuse:${hash}`))
                throw new AuthError('Token reuse detected', 401);
        }
        else {
            if (reuseStore.has(hash))
                throw new AuthError('Token reuse detected', 401);
        }
    };
    const markUsed = async (rt, ttl = 20000) => {
        if (!rt)
            return;
        const hash = hashToken(rt);
        if (config.redisClient) {
            await config.redisClient.set(`reuse:${hash}`, '1', 'PX', ttl);
        }
        else {
            reuseStore?.set(hash, true);
        }
    };
    // Password hashing
    const hashPassword = (pw) => argon2.hash(pw, { type: argon2.argon2id, memoryCost: 19456, timeCost: 2 });
    const verifyPassword = async (pw, hash) => {
        if (!hash) {
            await argon2.verify(await getDummyHash(), 'dummy');
            return false;
        }
        return argon2.verify(hash, pw);
    };
    // ===== API METHODS =====
    return {
        async register(db, data) {
            if (!data.email || !data.password)
                throw new AuthError('Missing fields', 400);
            // Password strength validation
            if (data.password.length < 8)
                throw new AuthError('Password must be at least 8 characters', 400);
            if (!/[A-Z]/.test(data.password))
                throw new AuthError('Password must contain at least one uppercase letter', 400);
            if (!/[a-z]/.test(data.password))
                throw new AuthError('Password must contain at least one lowercase letter', 400);
            if (!/[0-9]/.test(data.password))
                throw new AuthError('Password must contain at least one number', 400);
            // Normalize email to lowercase
            const normalizedEmail = data.email.toLowerCase();
            const existing = await db.findUserByEmail(normalizedEmail);
            if (existing) {
                throw new AuthError('Email already registered', 400);
            }
            try {
                const user = await db.createUser({
                    email: normalizedEmail,
                    password: await hashPassword(data.password),
                    role: 'user',
                    twoFactorEnabled: false,
                    twoFactorSecret: null,
                    recoveryCodes: null,
                });
                return {
                    id: user.id,
                    email: user.email,
                    role: user.role || 'user'
                };
            }
            catch (err) {
                if (err.code === 11000 || err.message?.includes('E11000') || err.message?.includes('duplicate key')) {
                    throw new AuthError('Email already registered', 400);
                }
                throw err;
            }
        },
        async login(db, input, res) {
            const { email, password, totp, recovery } = input;
            const normalizedEmail = email.toLowerCase();
            await checkRate(`login:${normalizedEmail}`);
            const user = await db.findUserByEmail(normalizedEmail);
            if (!user || !await verifyPassword(password, user?.password)) {
                throw new AuthError('Invalid credentials', 401);
            }
            let twoFactorVerified = false;
            if (user?.twoFactorEnabled) {
                const secret = decrypt(user.twoFactorSecret);
                if (!secret)
                    throw new AuthError('2FA configuration error', 500);
                const base32Secret = base32Encode(Buffer.from(secret, 'hex'));
                if (totp) {
                    twoFactorVerified = verifyTOTP(totp, base32Secret);
                }
                else if (recovery && user.recoveryCodes?.length) {
                    for (let i = 0; i < user.recoveryCodes.length; i++) {
                        if (await argon2.verify(user.recoveryCodes[i], recovery)) {
                            user.recoveryCodes.splice(i, 1);
                            await db.updateUser(user.id, { recoveryCodes: user.recoveryCodes });
                            twoFactorVerified = true;
                            break;
                        }
                    }
                }
                if (!twoFactorVerified)
                    throw new AuthError('Invalid 2FA', 401);
            }
            else {
                twoFactorVerified = true;
            }
            const accessToken = await signJWT({
                id: user.id,
                role: user.role || 'user',
                twoFactorVerified: twoFactorVerified === true
            }, config.secret);
            const refreshToken = crypto.randomBytes(40).toString('hex');
            await db.saveRefreshToken({
                token: refreshToken,
                userId: user.id,
                expiresAt: new Date(Date.now() + cookieMaxAge),
                twoFactorVerified: twoFactorVerified === true
            });
            // ✅ FIXED: secureCookies config प्रयोग गरियो
            if (res?.cookie) {
                res.cookie('rt', refreshToken, {
                    httpOnly: true,
                    secure: secureCookies, // ← यहाँ परिवर्तन
                    maxAge: cookieMaxAge,
                    sameSite: 'lax',
                    path: '/'
                });
            }
            return {
                accessToken,
                user: {
                    id: user.id,
                    email: user.email,
                    role: user.role || 'user',
                    twoFactorEnabled: user.twoFactorEnabled
                }
            };
        },
        // ✅ FIXED: Enable 2FA with pending secret check
        async enable2FA(db, userId) {
            const user = await db.findUserById(userId);
            if (!user)
                throw new AuthError('User not found', 404);
            if (user.twoFactorEnabled)
                throw new AuthError('2FA already enabled', 400);
            // ✅ Return existing pending secret if available
            if (user.pending2FASecret) {
                const existingSecret = decrypt(user.pending2FASecret);
                if (existingSecret) {
                    const base32 = base32Encode(Buffer.from(existingSecret, 'hex'));
                    return {
                        secret: base32,
                        uri: `otpauth://totp/${encodeURIComponent(issuer)}:${encodeURIComponent(user.email)}?secret=${base32}&issuer=${encodeURIComponent(issuer)}&algorithm=SHA1&digits=6&period=30`
                    };
                }
            }
            const { hex, base32 } = generateTOTPSecret();
            await db.updateUser(userId, { pending2FASecret: encrypt(hex) });
            return {
                secret: base32,
                uri: `otpauth://totp/${encodeURIComponent(issuer)}:${encodeURIComponent(user.email)}?secret=${base32}&issuer=${encodeURIComponent(issuer)}&algorithm=SHA1&digits=6&period=30`
            };
        },
        async verify2FA(db, userId, totp) {
            await checkRate(`2fa:${userId}`);
            const user = await db.findUserById(userId);
            const hexSecret = decrypt(user?.pending2FASecret);
            if (!hexSecret)
                throw new AuthError('No pending 2FA setup', 400);
            const base32Secret = base32Encode(Buffer.from(hexSecret, 'hex'));
            if (!verifyTOTP(totp, base32Secret)) {
                throw new AuthError('Invalid verification token', 401);
            }
            const codes = generateRecoveryCodes();
            const hashedCodes = await Promise.all(codes.map(c => argon2.hash(c, { type: argon2.argon2id, timeCost: 2 })));
            await db.updateUser(userId, {
                twoFactorEnabled: true,
                twoFactorSecret: user.pending2FASecret,
                pending2FASecret: null,
                recoveryCodes: hashedCodes,
            });
            return { recoveryCodes: codes };
        },
        async refresh(db, refreshToken, res) {
            if (!refreshToken)
                throw new AuthError('No refresh token provided', 401);
            const tokenHash = hashToken(refreshToken);
            const lockKey = `lock:${tokenHash}`;
            if (lockStore?.has(lockKey)) {
                throw new AuthError('Token reuse detected', 401);
            }
            lockStore?.set(lockKey, true);
            try {
                const tokenData = await db.findRefreshToken(refreshToken);
                if (!tokenData || new Date() > tokenData.expiresAt) {
                    throw new AuthError('Invalid or expired refresh token', 401);
                }
                await checkReuse(refreshToken);
                const user = await db.findUserById(tokenData.userId);
                if (!user)
                    throw new AuthError('User not found', 404);
                await db.deleteRefreshToken(refreshToken);
                await markUsed(refreshToken);
                const newRT = crypto.randomBytes(40).toString('hex');
                await db.saveRefreshToken({
                    token: newRT,
                    userId: user.id,
                    expiresAt: new Date(Date.now() + cookieMaxAge),
                    twoFactorVerified: tokenData.twoFactorVerified === true
                });
                const accessToken = await signJWT({
                    id: user.id,
                    role: user.role || 'user',
                    twoFactorVerified: tokenData.twoFactorVerified === true
                }, config.secret);
                // ✅ FIXED: secureCookies config प्रयोग गरियो
                if (res?.cookie) {
                    res.cookie('rt', newRT, {
                        httpOnly: true,
                        secure: secureCookies, // ← यहाँ परिवर्तन
                        maxAge: cookieMaxAge,
                        sameSite: 'lax',
                        path: '/'
                    });
                }
                return {
                    accessToken,
                    user: {
                        id: user.id,
                        email: user.email,
                        role: user.role || 'user',
                        twoFactorEnabled: user.twoFactorEnabled
                    }
                };
            }
            finally {
                setTimeout(() => {
                    lockStore?.delete(lockKey);
                }, 100);
            }
        },
        async logout(db, refreshToken) {
            if (!refreshToken)
                return { success: true };
            await db.deleteRefreshToken(refreshToken);
            return { success: true };
        },
        async disable2FA(db, userId, totp) {
            await checkRate(`2fa:${userId}`);
            const user = await db.findUserById(userId);
            if (!user?.twoFactorEnabled)
                throw new AuthError('2FA not enabled', 400);
            const hexSecret = decrypt(user.twoFactorSecret);
            if (!hexSecret)
                throw new AuthError('2FA configuration error', 500);
            const base32Secret = base32Encode(Buffer.from(hexSecret, 'hex'));
            if (!verifyTOTP(totp, base32Secret)) {
                throw new AuthError('Invalid 2FA token', 401);
            }
            await db.updateUser(userId, {
                twoFactorEnabled: false,
                twoFactorSecret: null,
                pending2FASecret: null,
                recoveryCodes: null,
            });
            return { success: true };
        },
        async regenerateRecoveryCodes(db, userId, totp) {
            await checkRate(`2fa:${userId}`);
            const user = await db.findUserById(userId);
            if (!user?.twoFactorEnabled)
                throw new AuthError('2FA not enabled', 400);
            const hexSecret = decrypt(user.twoFactorSecret);
            if (!hexSecret)
                throw new AuthError('2FA configuration error', 500);
            const base32Secret = base32Encode(Buffer.from(hexSecret, 'hex'));
            if (!verifyTOTP(totp, base32Secret)) {
                throw new AuthError('Invalid 2FA token', 401);
            }
            const codes = generateRecoveryCodes();
            const hashedCodes = await Promise.all(codes.map(c => argon2.hash(c, { type: argon2.argon2id, timeCost: 2 })));
            await db.updateUser(userId, { recoveryCodes: hashedCodes });
            return { recoveryCodes: codes };
        },
        // ✅ FIXED: Dolphin Server compatible middleware
        middleware(opts = {}) {
            return async (req, res, next) => {
                try {
                    // ✅ Safe headers access
                    const headers = req?.headers || req?.req?.headers || {};
                    const authHeader = headers?.authorization;
                    if (!authHeader || !authHeader.startsWith('Bearer ')) {
                        if (res && typeof res.status === 'function') {
                            return res.status(401).json({ message: 'Unauthorized' });
                        }
                        const err = new Error('Unauthorized');
                        err.status = 401;
                        throw err;
                    }
                    const token = authHeader.substring(7);
                    let decoded;
                    try {
                        decoded = await verifyJWT(token, config.secret);
                        req.user = decoded;
                    }
                    catch (jwtErr) {
                        if (res && typeof res.status === 'function') {
                            return res.status(401).json({ message: 'Unauthorized' });
                        }
                        const err = new Error('Unauthorized');
                        err.status = 401;
                        throw err;
                    }
                    if (opts.require2FA && decoded.twoFactorVerified !== true) {
                        if (res && typeof res.status === 'function') {
                            return res.status(403).json({ message: '2FA required' });
                        }
                        const err = new Error('2FA required');
                        err.status = 403;
                        throw err;
                    }
                    // ✅ Fixed: Check if next exists and is a function
                    if (next && typeof next === 'function') {
                        next();
                    }
                    // For Dolphin Server, if next is not a function, just return
                }
                catch (err) {
                    if (res && typeof res.status === 'function') {
                        return res.status(err.status || 401).json({ message: err.message });
                    }
                    throw err;
                }
            };
        },
        verifyToken: (token) => verifyJWT(token, config.secret)
    };
}
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