import { describe, test } from 'node:test';
import assert from 'node:assert/strict';
import { DSLCompiler } from '../../src/ast/DSLCompiler.js';

function createMockArbiter() {
  const relationConfigs = new Map();
  return {
    relationConfigs,
    setRelationConfig(relation, config) {
      relationConfigs.set(relation, config);
    }
  };
}

describe('Fact Declarations', () => {
  const arbiter = createMockArbiter();
  const compiler = new DSLCompiler(arbiter);

  test('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 }) => {
      const result = compiler.compile(input, `test-basic-fact-${Date.now()}`);
      assert.ok(result.success, `${description} should parse successfully`);
      assert.ok(result.program.facts.length > 0, 'Should have facts');
    });
  });

  test('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 }) => {
      const result = compiler.compile(input, `test-fact-property-${Date.now()}`);
      assert.ok(result.success, `${description} should parse successfully`);
    });
  });

  test('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 }) => {
      const result = compiler.compile(input, `test-fact-cache-${Date.now()}`);
      assert.ok(result.success, `${description} should parse successfully`);
    });
  });

  test('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 }) => {
      const result = compiler.compile(input, `test-fact-limit-${Date.now()}`);
      assert.ok(result.success, `${description} should parse successfully`);
    });
  });

  test('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 }) => {
      const dsl = `fact test(param: ${type})`;
      const result = compiler.compile(dsl, `test-param-type-${Date.now()}`);
      assert.ok(result.success, `${description} should parse successfully`);
    });
  });

  test('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 }) => {
      const result = compiler.compile(input, `test-complex-facts-${Date.now()}`);
      assert.ok(result.success, `${description} should parse successfully`);
      assert.ok(result.program.facts.length > 0, 'Should have facts');
    });
  });

  test('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 = compiler.compile(input, `test-fact-error-${Date.now()}`);
        assert.ok(!result.success, `${description} should fail to parse`);
      } catch {
        // Expected to fail
      }
    });
  });
});
