/**
 * Domain Module Unit Tests
 * Tests for category inference, contract extraction, and route discovery.
 * Uses Node's built-in test runner with AAA (Arrange, Act, Assert) pattern.
 */
import { test } from 'node:test'
import assert from 'node:assert'
import { inferCategory } from '../domain/category.js'
import { extractContract } from '../domain/contract.js'
import { discoverRoutes } from '../domain/discovery.js'
// ============================================================================
import type { RouteContract } from '../types.js'
// Category Inference Tests
// ============================================================================
test('inferCategory returns utility for exact utility path /reset', () => {
  // Arrange
  const path = '/reset'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'utility')
})
test('inferCategory returns utility for utility path with trailing slash', () => {
  // Arrange
  const path = '/health/'
  const method = 'GET'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'utility')
})
test('inferCategory returns utility for all registered utility paths', () => {
  // Arrange
  const utilityPaths = ['/ping', '/login', '/logout', '/auth', '/callback', '/purge', '/clear', '/initialize', '/setup', '/webhook']
  // Act & Assert
  for (const path of utilityPaths) {
    const result = inferCategory(path, 'GET', undefined)
    assert.strictEqual(result, 'utility', `Expected utility for path ${path}`)
  }
})
test('inferCategory returns observer for GET method on non-utility path', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory returns observer for observer suffix /search', () => {
  // Arrange
  const path = '/users/search'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory returns observer for observer suffix /count', () => {
  // Arrange
  const path = '/items/count'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory returns observer for observer suffix /stats', () => {
  // Arrange
  const path = '/metrics/stats'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory returns observer for observer suffix /status', () => {
  // Arrange
  const path = '/system/status'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory returns constructor for POST on collection path', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'constructor')
})
test('inferCategory returns constructor for POST on nested collection path', () => {
  // Arrange
  const path = '/api/v1/users'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'constructor')
})
test('inferCategory returns mutator for PUT method', () => {
  // Arrange
  const path = '/users/:id'
  const method = 'PUT'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'mutator')
})
test('inferCategory returns mutator for PATCH method', () => {
  // Arrange
  const path = '/users/:id'
  const method = 'PATCH'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'mutator')
})
test('inferCategory returns mutator for DELETE method', () => {
  // Arrange
  const path = '/users/:id'
  const method = 'DELETE'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'mutator')
})
test('inferCategory returns mutator for POST with path parameter', () => {
  // Arrange
  const path = '/users/:id'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'mutator')
})
test('inferCategory returns observer for POST without collection path or path param', () => {
  // Arrange
  const path = '/search'
  const method = 'POST'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory handles method case insensitively', () => {
  // Arrange
  const path = '/users'
  const method = 'get'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory respects override when provided', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const override = 'observer'
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
test('inferCategory ignores empty string override', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const override = ''
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'constructor')
})
test('inferCategory returns utility when override is utility', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const override = 'utility'
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'utility')
})
test('inferCategory returns mutator when override is mutator', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const override = 'mutator'
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'mutator')
})
test('inferCategory returns observer as default fallback', () => {
  // Arrange
  const path = '/'
  const method = 'HEAD'
  const override = undefined
  // Act
  const result = inferCategory(path, method, override)
  // Assert
  assert.strictEqual(result, 'observer')
})
// ============================================================================
// Contract Extraction Tests
// ============================================================================
test('extractContract extracts basic contract with defaults', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const schema = undefined
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.strictEqual(result.path, '/users')
  assert.strictEqual(result.method, 'GET')
  assert.strictEqual(result.category, 'observer')
  assert.deepStrictEqual(result.requires, [])
  assert.deepStrictEqual(result.ensures, [])
  assert.deepStrictEqual(result.invariants, [])
  assert.deepStrictEqual(result.regexPatterns, {})
  assert.strictEqual(result.validateRuntime, true)
  assert.deepStrictEqual(result.schema, {})
})
test('extractContract extracts x-requires array', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const schema = {
    'x-requires': ['admin', 'authenticated'],
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.requires, ['admin', 'authenticated'])
})
test('extractContract extracts x-ensures array', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const schema = {
    'x-ensures': ['user.created', 'email.sent'],
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.ensures, ['user.created', 'email.sent'])
})
test('extractContract ignores x-invariants (removed in v1.0)', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const schema = {
    'x-invariants': ['unique.email', 'active.status'],
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.invariants, [])
})
test('extractContract ignores x-regex (removed in v1.0)', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const schema = {
    'x-regex': {
      email: '^[\\w.-]+@[\\w.-]+\\.\\w+$',
      phone: '^\\+?[1-9]\\d{1,14}$',
    },
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.regexPatterns, {})
})
test('extractContract handles x-validate-runtime false', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const schema = {
    'x-validate-runtime': false,
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.strictEqual(result.validateRuntime, false)
})
test('extractContract defaults validateRuntime to true when not specified', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const schema = {}
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.strictEqual(result.validateRuntime, true)
})
test('extractContract respects x-category override', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const schema = {
    'x-category': 'utility',
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.strictEqual(result.category, 'utility')
})
test('extractContract ignores non-string x-category', () => {
  // Arrange
  const path = '/users'
  const method = 'POST'
  const schema = {
    'x-category': 123,
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.strictEqual(result.category, 'constructor')
})
test('extractContract handles empty schema object', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const schema = {}
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.requires, [])
  assert.deepStrictEqual(result.ensures, [])
  assert.deepStrictEqual(result.invariants, [])
  assert.deepStrictEqual(result.regexPatterns, {})
  assert.strictEqual(result.validateRuntime, true)
})
test('extractContract handles null x-regex gracefully', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const schema = {
    'x-regex': null,
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.regexPatterns, {})
})
test('extractContract handles non-object x-regex gracefully', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const schema = {
    'x-regex': 'invalid',
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.regexPatterns, {})
})
test('extractContract normalizes method to uppercase', () => {
  // Arrange
  const path = '/users'
  const method = 'post'
  const schema = undefined
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.strictEqual(result.method, 'POST')
})
test('extractContract preserves original schema in contract', () => {
  // Arrange
  const path = '/users'
  const method = 'GET'
  const schema = {
    type: 'object',
    properties: {
      name: { type: 'string' },
    },
  }
  // Act
  const result = extractContract(path, method, schema)
  // Assert
  assert.deepStrictEqual(result.schema, schema)
})
// ============================================================================
// Route Discovery Tests
// ============================================================================
test('discoverRoutes returns empty array for empty routes', () => {
  // Arrange
  const instance = { routes: [] }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.deepStrictEqual(result, [])
})
test('discoverRoutes returns empty array when routes is undefined', () => {
  // Arrange
  const instance = {}
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.deepStrictEqual(result, [])
})
test('discoverRoutes discovers single route', () => {
  // Arrange
  const instance = {
    routes: [
      { method: 'GET', url: '/users', schema: {} },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 1)
  assert.strictEqual(result[0]!.path, '/users')
  assert.strictEqual(result[0]!.method, 'GET')
  assert.strictEqual(result[0]!.category, 'observer')
})
test('discoverRoutes discovers multiple routes', () => {
  // Arrange
  const instance = {
    routes: [
      { method: 'GET', url: '/users' },
      { method: 'POST', url: '/users' },
      { method: 'GET', url: '/users/:id' },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 3)
  assert.strictEqual(result[0]!.category, 'observer')
  assert.strictEqual(result[1]!.category, 'constructor')
  assert.strictEqual(result[2]!.category, 'observer')
})
test('discoverRoutes handles routes with schemas', () => {
  // Arrange
  const instance = {
    routes: [
      {
        method: 'POST',
        url: '/users',
        schema: {
          'x-requires': ['admin'],
          'x-ensures': ['user.created'],
          'x-category': 'constructor',
        },
      },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 1)
  assert.strictEqual(result[0]!.path, '/users')
  assert.deepStrictEqual(result[0]!.requires, ['admin'])
  assert.deepStrictEqual(result[0]!.ensures, ['user.created'])
  assert.strictEqual(result[0]!.category, 'constructor')
})
test('discoverRoutes handles routes without schemas', () => {
  // Arrange
  const instance = {
    routes: [
      { method: 'DELETE', url: '/users/:id' },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 1)
  assert.strictEqual(result[0]!.path, '/users/:id')
  assert.strictEqual(result[0]!.method, 'DELETE')
  assert.strictEqual(result[0]!.category, 'mutator')
  assert.deepStrictEqual(result[0]!.requires, [])
})
test('discoverRoutes handles mixed route configurations', () => {
  // Arrange
  const instance = {
    routes: [
      { method: 'GET', url: '/health' },
      { method: 'POST', url: '/users', schema: { 'x-requires': ['auth'] } },
      { method: 'GET', url: '/users/:id' },
      { method: 'DELETE', url: '/users/:id' },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 4)
  assert.strictEqual(result[0]!.category, 'utility')
  assert.deepStrictEqual(result[0]!.requires, [])
  assert.strictEqual(result[1]!.category, 'constructor')
  assert.deepStrictEqual(result[1]!.requires, ['auth'])
  assert.strictEqual(result[2]!.category, 'observer')
  assert.deepStrictEqual(result[2]!.invariants, [])
  assert.strictEqual(result[3]!.category, 'mutator')
})
test('discoverRoutes ignores x-regex (removed in v1.0)', () => {
  // Arrange
  const instance = {
    routes: [
      {
        method: 'POST',
        url: '/users',
        schema: {
          'x-regex': {
            email: '^[\\w.-]+@[\\w.-]+\\.\\w+$',
          },
        },
      },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.deepStrictEqual(result[0]!.regexPatterns, {})
})
test('discoverRoutes handles route with validateRuntime disabled', () => {
  // Arrange
  const instance = {
    routes: [
      {
        method: 'GET',
        url: '/public',
        schema: {
          'x-validate-runtime': false,
        },
      },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result[0]!.validateRuntime, false)
})
test('discoverRoutes discovers utility routes correctly', () => {
  // Arrange
  const instance = {
    routes: [
      { method: 'GET', url: '/reset' },
      { method: 'POST', url: '/login' },
      { method: 'GET', url: '/callback' },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 3)
  for (const contract of result) {
    assert.strictEqual(contract.category, 'utility')
  }
})
test('discoverRoutes discovers observer suffix routes', () => {
  // Arrange
  const instance = {
    routes: [
      { method: 'POST', url: '/users/search' },
      { method: 'GET', url: '/items/count' },
      { method: 'POST', url: '/system/stats' },
      { method: 'GET', url: '/service/status' },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 4)
  for (const contract of result) {
    assert.strictEqual(contract.category, 'observer')
  }
})
test('discoverRoutes handles non-array routes property', () => {
  // Arrange
  const instance = {
    routes: 'invalid' as unknown as Array<{ method: string; url: string; schema?: Record<string, unknown> }>,
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.deepStrictEqual(result, [])
})
test('discoverRoutes handles null instance gracefully', () => {
  // Arrange
  const instance = null as unknown as { routes?: Array<{ method: string; url: string; schema?: Record<string, unknown> }> }
  // Act & Assert
  assert.throws(() => {
    discoverRoutes(instance)
  }, /Cannot read properties of null/)
})
test('discoverRoutes handles route with empty schema', () => {
  // Arrange
  const instance = {
    routes: [
      { method: 'GET', url: '/empty', schema: {} },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 1)
  assert.strictEqual(result[0]!.path, '/empty')
  assert.deepStrictEqual(result[0]!.requires, [])
  assert.deepStrictEqual(result[0]!.ensures, [])
  assert.deepStrictEqual(result[0]!.invariants, [])
})
test('discoverRoutes handles route with all x-annotations', () => {
  // Arrange
  const instance = {
    routes: [
      {
        method: 'POST',
        url: '/users',
        schema: {
          'x-category': 'constructor',
          'x-requires': ['auth', 'admin'],
          'x-ensures': ['created'],
          'x-invariants': ['unique'],
          'x-regex': { name: '^[a-z]+$' },
          'x-validate-runtime': true,
        },
      },
    ],
  }
  // Act
  const result = discoverRoutes(instance)
  // Assert
  assert.strictEqual(result.length, 1)
  const contract = result[0]!
  assert.strictEqual(contract.category, 'constructor')
  assert.deepStrictEqual(contract.requires, ['auth', 'admin'])
  assert.deepStrictEqual(contract.ensures, ['created'])
  assert.deepStrictEqual(contract.invariants, [])
  assert.deepStrictEqual(contract.regexPatterns, {})
  assert.strictEqual(contract.validateRuntime, true)
})