/**
 * Fact Declaration Tests
 * 
 * Tests the fact declaration system of the Evidence DSL,
 * including properties, caching, limits, and parameter types.
 */

import { DSLCompiler } from '../DSLCompiler.js';

export class FactTests {
  constructor() {
    this.arbiter = null;
    this.compiler = null;
    this.testResults = [];
  }

  setup(arbiter) {
    this.arbiter = arbiter;
    this.compiler = new DSLCompiler(arbiter);
  }

  runAllTests() {
    console.log('=== Fact Declaration Tests ===\n');

    this.testBasicFacts();
    this.testFactProperties();
    this.testFactCaching();
    this.testFactLimits();
    this.testParameterTypes();
    this.testComplexFacts();
    this.testFactErrors();

    return this.getTestResults();
  }

  testBasicFacts() {
    console.log('Testing Basic Facts...');
    
    const testCases = [
      {
        input: `fact hasRole(user: User, role: string)`,
        description: 'Simple fact with two parameters'
      },
      {
        input: `fact isMember(user: User, group: Group)`,
        description: 'Fact with custom types'
      },
      {
        input: `fact owns(user: User, doc: Document)`,
        description: 'Fact with multiple custom types'
      },
      {
        input: `fact isActive(user: User)`,
        description: 'Fact with single parameter'
      },
      {
        input: `fact hasPermission(user: User, resource: Resource, action: string)`,
        description: 'Fact with three parameters'
      }
    ];

    testCases.forEach(({ input, description }) => {
      try {
        const result = this.compiler.compile(input, `test-basic-fact-${Date.now()}`);
        this.assert(result.success, `${description} should parse successfully`);
        this.assert(result.program.facts.length > 0, 'Should have facts');
        console.log(`  ✓ ${description}`);
      } catch (error) {
        this.fail(`Basic fact test: ${description}`, error);
      }
    });
  }

  testFactProperties() {
    console.log('Testing Fact Properties...');
    
    const testCases = [
      {
        input: `fact isMember(user: User, group: Group) transitive`,
        description: 'Transitive fact'
      },
      {
        input: `fact isFriend(user: User, friend: User) symmetrical`,
        description: 'Symmetrical fact'
      },
      {
        input: `fact isMember(user: User, group: Group) transitive symmetrical`,
        description: 'Fact with multiple properties'
      },
      {
        input: `fact isColleague(user: User, colleague: User) symmetrical`,
        description: 'Symmetrical relationship fact'
      },
      {
        input: `fact isParentOf(parent: User, child: User) transitive`,
        description: 'Transitive hierarchical fact'
      }
    ];

    testCases.forEach(({ input, description }) => {
      try {
        const result = this.compiler.compile(input, `test-fact-property-${Date.now()}`);
        this.assert(result.success, `${description} should parse successfully`);
        console.log(`  ✓ ${description}`);
      } catch (error) {
        this.fail(`Fact property test: ${description}`, error);
      }
    });
  }

  testFactCaching() {
    console.log('Testing Fact Caching...');
    
    const testCases = [
      {
        input: `fact hasRole(user: User, role: string) CACHE eager`,
        description: 'Eager cached fact'
      },
      {
        input: `fact isMember(user: User, group: Group) CACHE lazy`,
        description: 'Lazy cached fact'
      },
      {
        input: `fact isMember(user: User, group: Group) transitive CACHE eager`,
        description: 'Transitive fact with eager caching'
      },
      {
        input: `fact isFriend(user: User, friend: User) symmetrical CACHE lazy`,
        description: 'Symmetrical fact with lazy caching'
      },
      {
        input: `fact hasPermission(user: User, resource: Resource, action: string) CACHE eager`,
        description: 'Multi-parameter fact with eager caching'
      }
    ];

    testCases.forEach(({ input, description }) => {
      try {
        const result = this.compiler.compile(input, `test-fact-cache-${Date.now()}`);
        this.assert(result.success, `${description} should parse successfully`);
        console.log(`  ✓ ${description}`);
      } catch (error) {
        this.fail(`Fact cache test: ${description}`, error);
      }
    });
  }

  testFactLimits() {
    console.log('Testing Fact Limits...');
    
    const testCases = [
      {
        input: `fact isMember(user: User, group: Group) limit 10`,
        description: 'Fact with simple limit'
      },
      {
        input: `fact isFriend(user: User, friend: User) limit 100`,
        description: 'Fact with higher limit'
      },
      {
        input: `fact isMember(user: User, group: Group) transitive limit 5`,
        description: 'Transitive fact with limit'
      },
      {
        input: `fact isFriend(user: User, friend: User) symmetrical limit 50`,
        description: 'Symmetrical fact with limit'
      },
      {
        input: `fact isMember(user: User, group: Group) transitive CACHE lazy limit 3`,
        description: 'Fact with properties, caching, and limit'
      }
    ];

    testCases.forEach(({ input, description }) => {
      try {
        const result = this.compiler.compile(input, `test-fact-limit-${Date.now()}`);
        this.assert(result.success, `${description} should parse successfully`);
        console.log(`  ✓ ${description}`);
      } catch (error) {
        this.fail(`Fact limit test: ${description}`, error);
      }
    });
  }

  testParameterTypes() {
    console.log('Testing Parameter Types...');
    
    const testCases = [
      { type: 'string', description: 'String parameter' },
      { type: 'number', description: 'Number parameter' },
      { type: 'boolean', description: 'Boolean parameter' },
      { type: 'timestamp', description: 'Timestamp parameter' },
      { type: 'User', description: 'Custom type parameter' },
      { type: 'Group', description: 'Another custom type parameter' },
      { type: 'Permission[]', description: 'Array type parameter' }
    ];

    testCases.forEach(({ type, description }) => {
      try {
        const dsl = `fact test(param: ${type})`;
        const result = this.compiler.compile(dsl, `test-param-type-${Date.now()}`);
        this.assert(result.success, `${description} should parse successfully`);
        console.log(`  ✓ ${description}`);
      } catch (error) {
        this.fail(`Parameter type test: ${description}`, error);
      }
    });
  }

  testComplexFacts() {
    console.log('Testing Complex Facts...');
    
    const testCases = [
      {
        input: `fact hasRole(user: User, role: string) CACHE eager
        fact isMember(user: User, group: Group) transitive CACHE lazy limit 10
        fact isFriend(user: User, friend: User) symmetrical CACHE eager limit 100
        fact owns(user: User, doc: Document) CACHE eager
        fact isSuspended(user: User) CACHE lazy`,
        description: 'Multiple facts with different configurations'
      },
      {
        input: `fact hasPermission(user: User, resource: Resource, action: string) CACHE eager
        fact isAdmin(user: User) CACHE eager
        fact isOwner(user: User, resource: Resource) CACHE eager
        fact hasAccess(user: User, resource: Resource, level: string) CACHE lazy`,
        description: 'Permission-related facts'
      },
      {
        input: `fact isMember(user: User, group: Group) transitive CACHE lazy limit 5
        fact isFriend(user: User, friend: User) symmetrical CACHE eager limit 50
        fact isColleague(user: User, colleague: User) symmetrical CACHE lazy limit 20
        fact isParentOf(parent: User, child: User) transitive CACHE eager limit 3`,
        description: 'Relationship facts with various properties'
      }
    ];

    testCases.forEach(({ input, description }) => {
      try {
        const result = this.compiler.compile(input, `test-complex-facts-${Date.now()}`);
        this.assert(result.success, `${description} should parse successfully`);
        this.assert(result.program.facts.length > 0, 'Should have facts');
        console.log(`  ✓ ${description}`);
      } catch (error) {
        this.fail(`Complex facts test: ${description}`, error);
      }
    });
  }

  testFactErrors() {
    console.log('Testing Fact Error Handling...');
    
    const testCases = [
      {
        input: `fact hasRole(user: User, role: string`,
        description: 'Missing closing parenthesis should fail'
      },
      {
        input: `fact hasRole(user: User, )`,
        description: 'Missing parameter name should fail'
      },
      {
        input: `fact hasRole(user: User, role: )`,
        description: 'Missing parameter type should fail'
      },
      {
        input: `fact hasRole(, role: string)`,
        description: 'Missing parameter name should fail'
      },
      {
        input: `fact hasRole(user: User, role: string) CACHE`,
        description: 'Incomplete cache directive should fail'
      },
      {
        input: `fact hasRole(user: User, role: string) limit`,
        description: 'Incomplete limit should fail'
      },
      {
        input: `fact hasRole(user: User, role: string) invalid`,
        description: 'Invalid property should fail'
      }
    ];

    testCases.forEach(({ input, description }) => {
      try {
        const result = this.compiler.compile(input, `test-fact-error-${Date.now()}`);
        this.assert(!result.success, `${description} should fail to parse`);
        console.log(`  ✓ ${description} (correctly failed)`);
      } catch (error) {
        // Expected to fail
        console.log(`  ✓ ${description} (correctly failed)`);
      }
    });
  }

  assert(condition, message) {
    if (!condition) {
      throw new Error(`Assertion failed: ${message}`);
    }
  }

  fail(testName, error) {
    console.log(`  ✗ ${testName} failed: ${error.message}`);
    this.testResults.push({
      test: testName,
      status: 'FAILED',
      error: error.message
    });
  }

  getTestResults() {
    const passed = this.testResults.filter(r => r.status === 'PASSED').length;
    const failed = this.testResults.filter(r => r.status === 'FAILED').length;
    const total = this.testResults.length;

    return {
      total: total,
      passed: passed,
      failed: failed,
      success: failed === 0,
      results: this.testResults
    };
  }
}

export function runFactTests(arbiter) {
  const test = new FactTests();
  test.setup(arbiter);
  return test.runAllTests();
}