package openapi3

import (
	"bytes"
	"testing"

	"github.com/stretchr/testify/require"
)

func TestExamplesSchemaValidation(t *testing.T) {
	type testCase struct {
		name                                  string
		requestSchemaExample                  string
		responseSchemaExample                 string
		mediaTypeRequestExample               string
		mediaTypeResponseExample              string
		readWriteOnlyMediaTypeRequestExample  string
		readWriteOnlyMediaTypeResponseExample string
		parametersExample                     string
		componentExamples                     string
		errContains                           string
	}

	testCases := []testCase{
		{
			name: "invalid_parameter_examples",
			parametersExample: `
          examples:
            param1example:
              value: abcd
   `,
			errContains: `invalid paths: invalid path /user: invalid operation POST: param1example`,
		},
		{
			name: "valid_parameter_examples",
			parametersExample: `
          examples:
            param1example:
              value: 1
   `,
		},
		{
			name: "invalid_parameter_example",
			parametersExample: `
          example: abcd
   `,
			errContains: `invalid path /user: invalid operation POST: invalid example`,
		},
		{
			name: "valid_parameter_example",
			parametersExample: `
          example: 1
   `,
		},
		{
			name: "invalid_component_examples",
			mediaTypeRequestExample: `
            examples:
              BadUser:
                $ref: '#/components/examples/BadUser'
   `,
			componentExamples: `
  examples:
    BadUser:
      value:
        username: "]bad["
        email: bad
        password: short
   `,
			errContains: `invalid paths: invalid path /user: invalid operation POST: example BadUser`,
		},
		{
			name: "valid_component_examples",
			mediaTypeRequestExample: `
            examples:
              BadUser:
                $ref: '#/components/examples/BadUser'
   `,
			componentExamples: `
  examples:
    BadUser:
      value:
        username: good
        email: good@mail.com
        password: password
   `,
		},
		{
			name: "invalid_mediatype_examples",
			mediaTypeRequestExample: `
            example:
              username: "]bad["
              email: bad
              password: short
   `,
			errContains: `invalid path /user: invalid operation POST: invalid example`,
		},
		{
			name: "valid_mediatype_examples",
			mediaTypeRequestExample: `
            example:
              username: good
              email: good@mail.com
              password: password
   `,
		},
		{
			name: "invalid_schema_request_example",
			requestSchemaExample: `
      example:
        username: good
        email: good@email.com
        # missing password
   `,
			errContains: `schema "CreateUserRequest": invalid example`,
		},
		{
			name: "valid_schema_request_example",
			requestSchemaExample: `
      example:
        username: good
        email: good@email.com
        password: password
   `,
		},
		{
			name: "invalid_schema_response_example",
			responseSchemaExample: `
      example:
        user_id: 1
        # missing access_token
   `,
			errContains: `schema "CreateUserResponse": invalid example`,
		},
		{
			name: "valid_schema_response_example",
			responseSchemaExample: `
      example:
        user_id: 1
        access_token: "abcd"
  `,
		},
		{
			name: "valid_readonly_writeonly_examples",
			readWriteOnlyMediaTypeRequestExample: `
            examples:
              ReadWriteOnlyRequest:
                $ref: '#/components/examples/ReadWriteOnlyRequestData'
`,
			readWriteOnlyMediaTypeResponseExample: `
              examples:
                ReadWriteOnlyResponse:
                  $ref: '#/components/examples/ReadWriteOnlyResponseData'
`,
			componentExamples: `
  examples:
    ReadWriteOnlyRequestData:
      value:
        username: user
        password: password
    ReadWriteOnlyResponseData:
      value:
        user_id: 4321
  `,
		},
		{
			name: "invalid_readonly_request_examples",
			readWriteOnlyMediaTypeRequestExample: `
            examples:
              ReadWriteOnlyRequest:
                $ref: '#/components/examples/ReadWriteOnlyRequestData'
`,
			componentExamples: `
  examples:
    ReadWriteOnlyRequestData:
      value:
        username: user
        password: password
        user_id: 4321
`,
			errContains: `ReadWriteOnlyRequest: readOnly property "user_id" in request`,
		},
		{
			name: "invalid_writeonly_response_examples",
			readWriteOnlyMediaTypeResponseExample: `
              examples:
                ReadWriteOnlyResponse:
                  $ref: '#/components/examples/ReadWriteOnlyResponseData'
`,
			componentExamples: `
  examples:
    ReadWriteOnlyResponseData:
      value:
        password: password
        user_id: 4321
`,

			errContains: `ReadWriteOnlyResponse: writeOnly property "password" in response`,
		},
	}

	testOptions := []struct {
		name                      string
		disableExamplesValidation bool
	}{
		{
			name:                      "examples_validation_disabled",
			disableExamplesValidation: true,
		},
		{
			name:                      "examples_validation_enabled",
			disableExamplesValidation: false,
		},
	}

	t.Parallel()

	for _, testOption := range testOptions {
		testOption := testOption
		t.Run(testOption.name, func(t *testing.T) {
			t.Parallel()
			for _, tc := range testCases {
				t.Run(tc.name, func(t *testing.T) {
					spec := bytes.NewBufferString(`
openapi: 3.0.3
info:
  title: An API
  version: 1.2.3.4
paths:
  /user:
    post:
      description: User creation.
      operationId: createUser
      parameters:
        - name: param1
          in: 'query'
          schema:
            format: int64
            type: integer`)
					spec.WriteString(tc.parametersExample)
					spec.WriteString(`
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/CreateUserRequest"
`)
					spec.WriteString(tc.mediaTypeRequestExample)
					spec.WriteString(`
        description: Created user object
      responses:
        '204':
          description: "success"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CreateUserResponse"`)
					spec.WriteString(tc.mediaTypeResponseExample)
					spec.WriteString(`
  /readWriteOnly:
    post:
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/ReadWriteOnlyData"
`)
					spec.WriteString(tc.readWriteOnlyMediaTypeRequestExample)
					spec.WriteString(`
      responses:
        '201':
          description: a response
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ReadWriteOnlyData"`)
					spec.WriteString(tc.readWriteOnlyMediaTypeResponseExample)
					spec.WriteString(`
components:
  schemas:
    CreateUserRequest:`)
					spec.WriteString(tc.requestSchemaExample)
					spec.WriteString(`
      required:
        - username
        - email
        - password
      properties:
        username:
          type: string
          pattern: "^[ a-zA-Z0-9_-]+$"
          minLength: 3
        email:
          type: string
          pattern: "^[A-Za-z0-9+_.-]+@(.+)$"
        password:
          type: string
          minLength: 7
      type: object
    CreateUserResponse:`)
					spec.WriteString(tc.responseSchemaExample)
					spec.WriteString(`
      required:
        - access_token
        - user_id
      properties:
        access_token:
          type: string
        user_id:
          format: int64
          type: integer
      type: object
    ReadWriteOnlyData:
      required:
        # only required in request
        - username
        - password
        # only required in response
        - user_id
      properties:
        username:
          type: string
          default: default
          writeOnly: true # only sent in a request
        password:
          type: string
          default: default
          writeOnly: true # only sent in a request
        user_id:
          format: int64
          default: 1
          type: integer
          readOnly: true # only returned in a response
      type: object
`)
					spec.WriteString(tc.componentExamples)

					loader := NewLoader()
					doc, err := loader.LoadFromData(spec.Bytes())
					require.NoError(t, err)

					if testOption.disableExamplesValidation {
						err = doc.Validate(loader.Context, DisableExamplesValidation())
					} else {
						err = doc.Validate(loader.Context, EnableExamplesValidation())
					}

					if tc.errContains != "" && !testOption.disableExamplesValidation {
						require.Error(t, err)
						require.ErrorContains(t, err, tc.errContains)
					} else {
						require.NoError(t, err)
					}
				})
			}
		})
	}
}

func TestExampleObjectValidation(t *testing.T) {
	type testCase struct {
		name                    string
		mediaTypeRequestExample string
		componentExamples       string
		errContains             string
	}

	testCases := []testCase{
		{
			name: "example_examples_mutually_exclusive",
			mediaTypeRequestExample: `
            examples:
              BadUser:
                $ref: '#/components/examples/BadUser'
            example:
              username: good
              email: real@email.com
              password: validpassword
`,
			errContains: `invalid path /user: invalid operation POST: example and examples are mutually exclusive`,
			componentExamples: `
  examples:
    BadUser:
      value:
        username: "]bad["
        email: bad
        password: short
`,
		},
		{
			name: "example_without_value",
			componentExamples: `
  examples:
    BadUser:
      description: empty user example
`,
			errContains: `invalid components: example "BadUser": no value or externalValue field`,
		},
		{
			name: "value_externalValue_mutual_exclusion",
			componentExamples: `
  examples:
    BadUser:
      value:
        username: good
        email: real@email.com
        password: validpassword
      externalValue: 'http://example.com/examples/example'
`,
			errContains: `invalid components: example "BadUser": value and externalValue are mutually exclusive`,
		},
	}

	testOptions := []struct {
		name                      string
		disableExamplesValidation bool
	}{
		{
			name:                      "examples_validation_disabled",
			disableExamplesValidation: true,
		},
		{
			name:                      "examples_validation_enabled",
			disableExamplesValidation: false,
		},
	}

	t.Parallel()

	for _, testOption := range testOptions {
		testOption := testOption
		t.Run(testOption.name, func(t *testing.T) {
			t.Parallel()
			for _, tc := range testCases {
				t.Run(tc.name, func(t *testing.T) {
					spec := bytes.NewBufferString(`
openapi: 3.0.3
info:
  title: An API
  version: 1.2.3.4
paths:
  /user:
    post:
      description: User creation.
      operationId: createUser
      parameters:
        - name: param1
          in: 'query'
          schema:
            format: int64
            type: integer
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/CreateUserRequest"
`)
					spec.WriteString(tc.mediaTypeRequestExample)
					spec.WriteString(`
        description: Created user object
        required: true
      responses:
        '204':
          description: "success"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CreateUserResponse"
components:
  schemas:
    CreateUserRequest:
      required:
        - username
        - email
        - password
      properties:
        username:
          type: string
          pattern: "^[ a-zA-Z0-9_-]+$"
          minLength: 3
        email:
          type: string
          pattern: "^[A-Za-z0-9+_.-]+@(.+)$"
        password:
          type: string
          minLength: 7
      type: object
    CreateUserResponse:
      description: represents the response to a User creation
      required:
        - access_token
        - user_id
      properties:
        access_token:
          type: string
        user_id:
          format: int64
          type: integer
      type: object
`)
					spec.WriteString(tc.componentExamples)

					loader := NewLoader()
					doc, err := loader.LoadFromData(spec.Bytes())
					require.NoError(t, err)

					if testOption.disableExamplesValidation {
						err = doc.Validate(loader.Context, DisableExamplesValidation())
					} else {
						err = doc.Validate(loader.Context)
					}

					if tc.errContains != "" {
						require.Error(t, err)
						require.ErrorContains(t, err, tc.errContains)
					} else {
						require.NoError(t, err)
					}
				})
			}
		})
	}
}