/*
 * Runtime Web – Unified Serverless Framework for Full-Stack TypeScript Applications
 * Documentation: https://runtimeweb.com/docs/getting-started
 *
 * @template: ai-chat
 */

/**
 * AI Chat Stack Property Tests
 *
 * Property-based tests for CDK stage configuration.
 */

import * as fc from 'fast-check';
import * as cdk from 'aws-cdk-lib';

/**
 * Stage type definition.
 */
type Stage = 'dev' | 'staging' | 'prod';

/**
 * Mock stage defaults for testing.
 */
const getStageDefaults = (stage: Stage): { removalPolicy: cdk.RemovalPolicy } => {
    switch (stage) {
        case 'prod':
            return { removalPolicy: cdk.RemovalPolicy.RETAIN };
        case 'staging':
        case 'dev':
        default:
            return { removalPolicy: cdk.RemovalPolicy.DESTROY };
    }
};

/**
 * Mock resource naming for testing.
 */
const getResourceName = (serviceName: string, resourceType: string, stage: Stage): string => {
    return `${serviceName}-${resourceType}-${stage}`;
};

describe('AI Chat Stack Properties', () => {
    /**
     * Feature: ai-chat-template, Property 19: CDK Stage-Based Configuration
     *
     * For any stage value (dev, staging, prod), the CDK stack SHALL configure
     * removal policies appropriately: DESTROY for dev/staging, RETAIN for prod.
     * The DynamoDB table and other resources SHALL use stage-specific naming.
     *
     * **Validates: Requirements 12.5, 12.7**
     */
    describe('Property 19: CDK Stage-Based Configuration', () => {
        it('should use RETAIN removal policy for prod stage', async () => {
            await fc.assert(
                fc.asyncProperty(fc.constant('prod' as Stage), async (stage) => {
                    const defaults = getStageDefaults(stage);

                    expect(defaults.removalPolicy).toBe(cdk.RemovalPolicy.RETAIN);
                }),
                { numRuns: 100 }
            );
        });

        it('should use DESTROY removal policy for dev and staging stages', async () => {
            await fc.assert(
                fc.asyncProperty(
                    fc.constantFrom('dev' as Stage, 'staging' as Stage),
                    async (stage) => {
                        const defaults = getStageDefaults(stage);

                        expect(defaults.removalPolicy).toBe(cdk.RemovalPolicy.DESTROY);
                    }
                ),
                { numRuns: 100 }
            );
        });

        it('should generate stage-specific resource names', async () => {
            await fc.assert(
                fc.asyncProperty(
                    fc.string({ minLength: 1, maxLength: 20 }).filter((s) => /^[a-z][a-z0-9-]*$/.test(s)),
                    fc.constantFrom('dev' as Stage, 'staging' as Stage, 'prod' as Stage),
                    async (serviceName, stage) => {
                        const tableName = getResourceName(serviceName, 'sessions', stage);

                        // Resource name should include service name
                        expect(tableName).toContain(serviceName);

                        // Resource name should include stage
                        expect(tableName).toContain(stage);

                        // Resource name should include resource type
                        expect(tableName).toContain('sessions');
                    }
                ),
                { numRuns: 100 }
            );
        });

        it('should differentiate resources between stages', async () => {
            await fc.assert(
                fc.asyncProperty(
                    fc.string({ minLength: 1, maxLength: 20 }).filter((s) => /^[a-z][a-z0-9-]*$/.test(s)),
                    async (serviceName) => {
                        const devName = getResourceName(serviceName, 'sessions', 'dev');
                        const stagingName = getResourceName(serviceName, 'sessions', 'staging');
                        const prodName = getResourceName(serviceName, 'sessions', 'prod');

                        // All names should be unique
                        expect(devName).not.toBe(stagingName);
                        expect(devName).not.toBe(prodName);
                        expect(stagingName).not.toBe(prodName);
                    }
                ),
                { numRuns: 100 }
            );
        });

        it('should apply consistent removal policy across all resources in a stage', async () => {
            await fc.assert(
                fc.asyncProperty(
                    fc.constantFrom('dev' as Stage, 'staging' as Stage, 'prod' as Stage),
                    fc.array(fc.constantFrom('sessions', 'cache', 'logs'), { minLength: 1, maxLength: 5 }),
                    async (stage, resourceTypes) => {
                        const defaults = getStageDefaults(stage);

                        // All resources in the same stage should have the same removal policy
                        for (const _resourceType of resourceTypes) {
                            const resourceDefaults = getStageDefaults(stage);
                            expect(resourceDefaults.removalPolicy).toBe(defaults.removalPolicy);
                        }
                    }
                ),
                { numRuns: 100 }
            );
        });

        it('should validate stage values', async () => {
            const validStages: Stage[] = ['dev', 'staging', 'prod'];

            await fc.assert(
                fc.asyncProperty(
                    fc.constantFrom(...validStages),
                    async (stage) => {
                        // Valid stages should be accepted
                        expect(validStages).toContain(stage);

                        // Should return valid defaults
                        const defaults = getStageDefaults(stage);
                        expect(defaults.removalPolicy).toBeDefined();
                    }
                ),
                { numRuns: 100 }
            );
        });
    });
});
