// store.ts
//
// Authentication storage interface and in-memory implementation.
// The interface allows easy migration to PostgreSQL later.

import { User, type UserId } from "../user";
import { generateToken, hashToken } from "./token";
import type { AuthMethod, SessionData, TokenId, TokenType } from "./types";

// Data for creating a new session (tokenId generated internally)
export type CreateSessionData = {
    userId: string;
    tokenType: TokenType;
    authMethod: AuthMethod;
    expiresAt: Date;
    userAgent?: string;
    ipAddress?: string;
};

// Data for creating a new user
export type CreateUserData = {
    email: string;
    passwordHash: string;
    displayName?: string;
};

// Abstract interface for auth storage - implement for PostgreSQL later
export interface AuthStore {
    // Session operations
    createSession(
        data: CreateSessionData,
    ): Promise<{ token: string; session: SessionData }>;
    getSession(tokenId: TokenId): Promise<SessionData | null>;
    updateLastUsed(tokenId: TokenId): Promise<void>;
    deleteSession(tokenId: TokenId): Promise<void>;
    deleteUserSessions(userId: UserId): Promise<number>;

    // User operations
    getUserByEmail(email: string): Promise<User | null>;
    getUserById(userId: UserId): Promise<User | null>;
    createUser(data: CreateUserData): Promise<User>;
    getUserPasswordHash(userId: UserId): Promise<string | null>;
    setUserPassword(userId: UserId, passwordHash: string): Promise<void>;
    updateUserEmailVerified(userId: UserId): Promise<void>;
}

// In-memory implementation for development
export class InMemoryAuthStore implements AuthStore {
    private sessions: Map<string, SessionData> = new Map();
    private users: Map<string, User> = new Map();
    private usersByEmail: Map<string, string> = new Map();
    private passwordHashes: Map<string, string> = new Map();
    private emailVerified: Map<string, boolean> = new Map();

    async createSession(
        data: CreateSessionData,
    ): Promise<{ token: string; session: SessionData }> {
        const token = generateToken();
        const tokenId = hashToken(token);

        const session: SessionData = {
            tokenId,
            userId: data.userId,
            tokenType: data.tokenType,
            authMethod: data.authMethod,
            createdAt: new Date(),
            expiresAt: data.expiresAt,
            userAgent: data.userAgent,
            ipAddress: data.ipAddress,
        };

        this.sessions.set(tokenId, session);
        return { token, session };
    }

    async getSession(tokenId: TokenId): Promise<SessionData | null> {
        const session = this.sessions.get(tokenId);
        if (!session) return null;

        // Check expiration
        if (new Date() > session.expiresAt) {
            this.sessions.delete(tokenId);
            return null;
        }

        return session;
    }

    async updateLastUsed(tokenId: TokenId): Promise<void> {
        const session = this.sessions.get(tokenId);
        if (session) {
            session.lastUsedAt = new Date();
        }
    }

    async deleteSession(tokenId: TokenId): Promise<void> {
        this.sessions.delete(tokenId);
    }

    async deleteUserSessions(userId: UserId): Promise<number> {
        let count = 0;
        for (const [tokenId, session] of this.sessions) {
            if (session.userId === userId) {
                this.sessions.delete(tokenId);
                count++;
            }
        }
        return count;
    }

    async getUserByEmail(email: string): Promise<User | null> {
        const userId = this.usersByEmail.get(email.toLowerCase());
        if (!userId) return null;
        return this.users.get(userId) ?? null;
    }

    async getUserById(userId: UserId): Promise<User | null> {
        return this.users.get(userId) ?? null;
    }

    async createUser(data: CreateUserData): Promise<User> {
        const user = User.create(data.email, {
            displayName: data.displayName,
            status: "pending", // Pending until email verified
        });

        this.users.set(user.id, user);
        this.usersByEmail.set(data.email.toLowerCase(), user.id);
        this.passwordHashes.set(user.id, data.passwordHash);
        this.emailVerified.set(user.id, false);

        return user;
    }

    async getUserPasswordHash(userId: UserId): Promise<string | null> {
        return this.passwordHashes.get(userId) ?? null;
    }

    async setUserPassword(userId: UserId, passwordHash: string): Promise<void> {
        this.passwordHashes.set(userId, passwordHash);
    }

    async updateUserEmailVerified(userId: UserId): Promise<void> {
        this.emailVerified.set(userId, true);

        // Update user status to active
        const user = this.users.get(userId);
        if (user) {
            // Create new user with active status
            const updatedUser = User.create(user.email, {
                id: user.id,
                displayName: user.displayName,
                status: "active",
                roles: [...user.roles],
                permissions: [...user.permissions],
            });
            this.users.set(userId, updatedUser);
        }
    }
}