import { expect, test, describe, mock } from "bun:test";

// Since cli.ts involves complex CLI functionality and file operations,
// we'll test the core logic and utility functions without actual CLI execution

describe("CLI Module", () => {
  describe("module structure", () => {
    test("should export CLI functions", async () => {
      // Test that we can import the module without errors
      const module = await import("../cli");
      expect(module).toBeDefined();
    });
  });

  describe("argument parsing logic", () => {
    test("should handle basic argument parsing patterns", () => {
      // Test basic argument parsing logic
      function parseBasicArgs(args: string[]): { [key: string]: any } {
        const result: { [key: string]: any } = {};

        for (let i = 0; i < args.length; i++) {
          const arg = args[i];

          if (arg.startsWith('--')) {
            const key = arg.slice(2);
            const nextArg = args[i + 1];

            if (nextArg && !nextArg.startsWith('-')) {
              result[key] = nextArg;
              i++; // Skip next argument as it's a value
            } else {
              result[key] = true; // Boolean flag
            }
          } else if (arg.startsWith('-') && arg.length === 2) {
            const key = arg.slice(1);
            const nextArg = args[i + 1];

            if (nextArg && !nextArg.startsWith('-')) {
              result[key] = nextArg;
              i++; // Skip next argument as it's a value
            } else {
              result[key] = true; // Boolean flag
            }
          } else if (!arg.startsWith('-')) {
            // Positional argument
            if (!result._positional) result._positional = [];
            result._positional.push(arg);
          }
        }

        return result;
      }

      // Test various argument patterns
      expect(parseBasicArgs(['--help'])).toEqual({ help: true });
      expect(parseBasicArgs(['--format', 'json'])).toEqual({ format: 'json' });
      expect(parseBasicArgs(['-f', 'typescript'])).toEqual({ f: 'typescript' });
      expect(parseBasicArgs(['--stream', 'Create a hierarchy'])).toEqual({ 
        stream: 'Create a hierarchy'
      });
      expect(parseBasicArgs(['--format', 'both', '--quiet', 'test prompt'])).toEqual({
        format: 'both',
        quiet: 'test prompt'
      });
    });

    test("should handle complex argument combinations", () => {
      function parseComplexArgs(args: string[]): any {
        const options = {
          format: 'json',
          complexity: 'medium',
          hierarchyVersion: 'v2',
          stream: false,
          quiet: false,
          skills: true,
          tools: true,
          examples: true,
          output: './output'
        };

        // Simulate parsing logic
        for (let i = 0; i < args.length; i++) {
          const arg = args[i];

          if (arg === '--format' || arg === '-f') {
            options.format = args[++i];
          } else if (arg === '--complexity' || arg === '-c') {
            options.complexity = args[++i];
          } else if (arg === '--hierarchy-version') {
            options.hierarchyVersion = args[++i];
          } else if (arg === '--stream') {
            options.stream = true;
          } else if (arg === '--quiet') {
            options.quiet = true;
          } else if (arg === '--output' || arg === '-o') {
            options.output = args[++i];
          }
        }

        return options;
      }

      const result = parseComplexArgs([
        '--format', 'typescript',
        '--complexity', 'complex',
        '--hierarchy-version', 'v1',
        '--stream',
        '--quiet',
        '-o', './custom-output'
      ]);

      expect(result.format).toBe('typescript');
      expect(result.complexity).toBe('complex');
      expect(result.hierarchyVersion).toBe('v1');
      expect(result.stream).toBe(true);
      expect(result.quiet).toBe(true);
      expect(result.output).toBe('./custom-output');
    });
  });

  describe("filename generation logic", () => {
    test("should generate valid filenames", () => {
      function generateFilename(specification: string, format: string): string {
        // Simulate filename generation logic
        const sanitized = specification
          .toLowerCase()
          .replace(/[^a-z0-9\s-]/g, '')
          .replace(/\s+/g, '-')
          .slice(0, 50);

        const timestamp = new Date().toISOString().slice(0, 19).replace(/[:-]/g, '');
        return `hierarchy-${sanitized}-${timestamp}`;
      }

      const filename1 = generateFilename("Create a technology hierarchy for web development", "json");
      expect(filename1).toMatch(/^hierarchy-create-a-technology-hierarchy-for-web-development-\d{8}T\d{6}$/);

      const filename2 = generateFilename("Healthcare hierarchy for emergency medicine!", "typescript");
      expect(filename2).toMatch(/^hierarchy-healthcare-hierarchy-for-emergency-medicine-\d{8}T\d{6}$/);

      const filename3 = generateFilename("Finance & Banking: Investment Management", "yaml");
      expect(filename3).toMatch(/^hierarchy-finance-banking-investment-management-\d{8}T\d{6}$/);
    });

    test("should handle edge cases in filename generation", () => {
      function generateSafeFilename(specification: string): string {
        if (!specification || specification.trim().length === 0) {
          return `hierarchy-default-${Date.now()}`;
        }

        const sanitized = specification
          .toLowerCase()
          .replace(/[^a-z0-9\s-]/g, '')
          .replace(/\s+/g, '-')
          .replace(/^-+|-+$/g, '') // Remove leading/trailing dashes
          .slice(0, 50);

        return sanitized || `hierarchy-${Date.now()}`;
      }

      expect(generateSafeFilename("")).toMatch(/^hierarchy-default-\d+$/);
      expect(generateSafeFilename("   ")).toMatch(/^hierarchy-default-\d+$/);
      expect(generateSafeFilename("!!!@@@###")).toMatch(/^hierarchy-\d+$/);
      expect(generateSafeFilename("Valid Name")).toBe("valid-name");
    });
  });

  describe("validation logic", () => {
    test("should validate CLI options", () => {
      function validateOptions(options: any, specification: string): { valid: boolean; errors: string[] } {
        const errors: string[] = [];

        // Validate specification
        if (!specification || specification.trim().length === 0) {
          errors.push("Specification is required");
        }

        // Validate format
        const validFormats = ['json', 'typescript', 'both'];
        if (options.format && !validFormats.includes(options.format)) {
          errors.push(`Invalid format: ${options.format}. Must be one of: ${validFormats.join(', ')}`);
        }

        // Validate complexity
        const validComplexities = ['simple', 'medium', 'complex'];
        if (options.complexity && !validComplexities.includes(options.complexity)) {
          errors.push(`Invalid complexity: ${options.complexity}. Must be one of: ${validComplexities.join(', ')}`);
        }

        // Validate hierarchy version
        const validVersions = ['v1', 'v2'];
        if (options.hierarchyVersion && !validVersions.includes(options.hierarchyVersion)) {
          errors.push(`Invalid hierarchy version: ${options.hierarchyVersion}. Must be one of: ${validVersions.join(', ')}`);
        }

        return {
          valid: errors.length === 0,
          errors
        };
      }

      // Valid options
      const validResult = validateOptions({
        format: 'json',
        complexity: 'medium',
        hierarchyVersion: 'v2'
      }, "Create a technology hierarchy");

      expect(validResult.valid).toBe(true);
      expect(validResult.errors).toHaveLength(0);

      // Invalid options
      const invalidResult = validateOptions({
        format: 'xml',
        complexity: 'extreme',
        hierarchyVersion: 'v3'
      }, "");

      expect(invalidResult.valid).toBe(false);
      expect(invalidResult.errors).toContain("Specification is required");
      expect(invalidResult.errors).toContain("Invalid format: xml. Must be one of: json, typescript, both");
      expect(invalidResult.errors).toContain("Invalid complexity: extreme. Must be one of: simple, medium, complex");
      expect(invalidResult.errors).toContain("Invalid hierarchy version: v3. Must be one of: v1, v2");
    });
  });

  describe("domain extraction logic", () => {
    test("should extract domain from specification", () => {
      function extractDomain(specification: string): string {
        const commonDomains = [
          'technology', 'tech', 'software', 'web', 'mobile', 'ai', 'data',
          'healthcare', 'health', 'medical', 'medicine',
          'finance', 'financial', 'banking', 'investment',
          'education', 'educational', 'learning', 'academic',
          'retail', 'ecommerce', 'commerce', 'sales',
          'manufacturing', 'production', 'industrial',
          'consulting', 'management', 'business'
        ];

        const words = specification.toLowerCase().split(/\s+/);

        for (const word of words) {
          // Check for specific domain matches
          if (word.includes('technology') || word.includes('tech')) return 'Technology';
          if (word.includes('healthcare') || word.includes('health') || word.includes('medical')) return 'Healthcare';
          if (word.includes('finance') || word.includes('banking')) return 'Finance';
          if (word.includes('education') || word.includes('learning')) return 'Education';
          if (word.includes('retail') || word.includes('commerce')) return 'Retail';
          if (word.includes('manufacturing')) return 'Manufacturing';
          if (word.includes('consulting')) return 'Consulting';
        }

        return 'General';
      }

      expect(extractDomain("Create a technology hierarchy for web development")).toBe('Technology');
      expect(extractDomain("Healthcare hierarchy for emergency medicine")).toBe('Healthcare');
      expect(extractDomain("Finance hierarchy for investment banking")).toBe('Finance');
      expect(extractDomain("Education hierarchy for online learning")).toBe('Education');
      expect(extractDomain("Retail hierarchy for e-commerce")).toBe('Retail');
      expect(extractDomain("Manufacturing hierarchy for automotive")).toBe('Manufacturing');
      expect(extractDomain("Consulting hierarchy for management")).toBe('Consulting');
      expect(extractDomain("Create a hierarchy for something unknown")).toBe('General');
    });
  });

  describe("output saving logic", () => {
    test("should handle output saving parameters", () => {
      function prepareOutputSave(content: string, filename: string, format: string, outputDir: string, quiet: boolean) {
        const result = {
          content,
          filename,
          format,
          outputDir,
          quiet,
          fullPath: `${outputDir}/${filename}.${format === 'typescript' ? 'ts' : format}`,
          shouldLog: !quiet
        };

        return result;
      }

      const result = prepareOutputSave(
        "const example = 'test';",
        "test-hierarchy",
        "typescript",
        "./output",
        false
      );

      expect(result.content).toBe("const example = 'test';");
      expect(result.filename).toBe("test-hierarchy");
      expect(result.format).toBe("typescript");
      expect(result.outputDir).toBe("./output");
      expect(result.fullPath).toBe("./output/test-hierarchy.ts");
      expect(result.shouldLog).toBe(true);

      const quietResult = prepareOutputSave(
        '{"test": true}',
        "test-hierarchy",
        "json",
        "./custom",
        true
      );

      expect(quietResult.fullPath).toBe("./custom/test-hierarchy.json");
      expect(quietResult.shouldLog).toBe(false);
    });
  });

  describe("error handling", () => {
    test("should handle various error scenarios", () => {
      function handleCliError(error: any): { message: string; code: number } {
        if (error.message?.includes('ENOENT')) {
          return {
            message: 'Output directory does not exist',
            code: 1
          };
        }

        if (error.message?.includes('EACCES')) {
          return {
            message: 'Permission denied writing to output directory',
            code: 1
          };
        }

        if (error.message?.includes('API key')) {
          return {
            message: 'OpenAI API key is required. Set OPENAI_API_KEY environment variable.',
            code: 1
          };
        }

        if (error.message?.includes('Invalid parameter')) {
          return {
            message: 'Invalid API parameters. Check your configuration.',
            code: 1
          };
        }

        return {
          message: `Unexpected error: ${error.message}`,
          code: 1
        };
      }

      expect(handleCliError(new Error('ENOENT: no such file or directory'))).toEqual({
        message: 'Output directory does not exist',
        code: 1
      });

      expect(handleCliError(new Error('EACCES: permission denied'))).toEqual({
        message: 'Permission denied writing to output directory',
        code: 1
      });

      expect(handleCliError(new Error('API key is missing'))).toEqual({
        message: 'OpenAI API key is required. Set OPENAI_API_KEY environment variable.',
        code: 1
      });

      expect(handleCliError(new Error('Something unexpected happened'))).toEqual({
        message: 'Unexpected error: Something unexpected happened',
        code: 1
      });
    });
  });

  describe("help and version display", () => {
    test("should format help message correctly", () => {
      function formatHelpMessage(): string {
        return `
Professional Hierarchy Generator CLI

Usage: bun run sumpin [OPTIONS] "<natural language specification>"

Options:
  -h, --help                    Show this help message
  -v, --version                 Show version
  -o, --output DIR              Output directory (default: ./output)
  -f, --format FORMAT           Output format: json, typescript, both (default: json)
  -c, --complexity LEVEL        Complexity: simple, medium, complex (default: medium)
      --hierarchy-version VER   Version: v1, v2 (default: v2)
      --stream                  Enable streaming output
      --quiet                   Suppress progress messages
      --skills                  Include skills and competencies (default: true)
      --tools                   Include tools and technologies (default: true)
      --examples                Include practical examples (default: true)

Examples:
  bun run sumpin "Create a technology hierarchy for web development"
  bun run sumpin -f typescript --stream "Healthcare hierarchy for emergency medicine"
  bun run sumpin --format both --complexity complex "Finance hierarchy for investment banking"
`.trim();
      }

      const helpMessage = formatHelpMessage();
      expect(helpMessage).toContain('Professional Hierarchy Generator CLI');
      expect(helpMessage).toContain('Usage:');
      expect(helpMessage).toContain('Options:');
      expect(helpMessage).toContain('Examples:');
      expect(helpMessage).toContain('--help');
      expect(helpMessage).toContain('--format');
      expect(helpMessage).toContain('--complexity');
    });

    test("should format version message correctly", () => {
      function formatVersionMessage(): string {
        return 'Professional Hierarchy Generator v1.0.0';
      }

      expect(formatVersionMessage()).toBe('Professional Hierarchy Generator v1.0.0');
    });
  });
});