import { describe, expect, test, vi } from 'vitest';

import { Config } from '../../source/services/config.ts';

/**
 * Tests that the config defaults to a 1 MiB request body limit.
 */
const testConfigDefaultsTo1MiBRequestBodyLimit = (): void => {
    const config = Config.from({
        database: {},
        server: {},
        auth: {},
    });

    expect(config.server.maxRequestBodyBytes).toBe(1024 * 1024);
    expect(config.database.path).toBe('data.db');
    expect(config.server.port).toBe(3000);
    expect(config.server.host).toBe('0.0.0.0');
    expect(config.server.cors.origin).toBe('*');
    expect(config.server.cors.methods).toEqual([ 'GET', 'POST', 'PUT', 'DELETE', 'OPTIONS' ]);
    expect(config.server.cors.allowedHeaders).toEqual([ 'Content-Type', 'cache-control', 'X-Timestamp', 'X-Public-Key', 'X-Signature' ]);
    expect(config.auth.timestampWindowMs).toBe(300000);
};

/**
 * Tests that the config loads the request body limit from the environment.
 */
const testConfigLoadsRequestBodyLimitFromEnvironment = (): void => {
    vi.stubEnv('SERVER_MAX_REQUEST_BODY_BYTES', '2048');

    expect(Config.fromEnv().server.maxRequestBodyBytes).toBe(2048);
};

/**
 * Tests that the config rejects an invalid request body limit.
 */
const testConfigRejectsInvalidRequestBodyLimit = (): void => {
    expect(() =>
        Config.from({
            database: {},
            server: { maxRequestBodyBytes: '0' },
            auth: {},
        })).toThrow();
};

/**
 * tests that the config loads the database path from the environment.
 */
const testConfigLoadsDatabasePathFromEnvironment = (): void => {
    vi.stubEnv('DATABASE_PATH', 'test.db');

    expect(Config.fromEnv().database.path).toBe('test.db');
};

/**
 * tests that the config loads the server port from the environment.
 */
const testConfigLoadsServerPortFromEnvironment = (): void => {
    vi.stubEnv('SERVER_PORT', '3000');

    expect(Config.fromEnv().server.port).toBe(3000);
};

/**
 * tests that the config loads the server host from the environment.
 */
const testConfigLoadsServerHostFromEnvironment = (): void => {
    vi.stubEnv('SERVER_HOST', '0.0.0.0');

    expect(Config.fromEnv().server.host).toBe('0.0.0.0');
};

/**
 * tests that the config loads the cors configuration from the environment.
 */
const testConfigLoadsCorsConfigurationFromEnvironment = (): void => {
    vi.stubEnv('CORS_ORIGIN', '*');

    expect(Config.fromEnv().server.cors.origin).toBe('*');
};

/**
 * tests that the config loads the cors methods from the environment.
 */
const testConfigLoadsCorsMethodsFromEnvironment = (): void => {
    vi.stubEnv('CORS_METHODS', 'GET,POST,PUT,DELETE,OPTIONS');

    expect(Config.fromEnv().server.cors.methods).toEqual([ 'GET', 'POST', 'PUT', 'DELETE', 'OPTIONS' ]);
};

/**
 * tests that the config loads the cors allowed headers from the environment.
 */
const testConfigLoadsCorsAllowedHeadersFromEnvironment = (): void => {
    vi.stubEnv('CORS_ALLOWED_HEADERS', 'Content-Type,cache-control,X-Timestamp');

    expect(Config.fromEnv().server.cors.allowedHeaders).toEqual([ 'Content-Type', 'cache-control', 'X-Timestamp' ]);
};

/**
 * tests that the config loads the auth configuration from the environment.
 */
const testConfigLoadsAuthConfigurationFromEnvironment = (): void => {
    vi.stubEnv('AUTH_TIMESTAMP_WINDOW_MS', '1000');

    expect(Config.fromEnv().auth.timestampWindowMs).toBe(1000);
};

describe('Config', () => {
    test('defaults to a 1 MiB request body limit', testConfigDefaultsTo1MiBRequestBodyLimit);
    test('loads the request body limit from the environment', testConfigLoadsRequestBodyLimitFromEnvironment);
    test('rejects the invalid request body limit', testConfigRejectsInvalidRequestBodyLimit);
    test('loads the database path from the environment', testConfigLoadsDatabasePathFromEnvironment);
    test('loads the server port from the environment', testConfigLoadsServerPortFromEnvironment);
    test('loads the server host from the environment', testConfigLoadsServerHostFromEnvironment);
    test('loads the cors configuration from the environment', testConfigLoadsCorsConfigurationFromEnvironment);
    test('loads the cors methods from the environment', testConfigLoadsCorsMethodsFromEnvironment);
    test('loads the cors allowed headers from the environment', testConfigLoadsCorsAllowedHeadersFromEnvironment);
    test('loads the auth configuration from the environment', testConfigLoadsAuthConfigurationFromEnvironment);
});