// Spec validates a spec document
// It validates the spec json against the json schema for swagger
// and then validates a number of extra rules that can't be expressed in json schema:
//
// 	- definition can't declare a property that's already defined by one of its ancestors
// 	- definition's ancestor can't be a descendant of the same model
// 	- each api path should be non-verbatim (account for path param names) unique per method
// 	- each security reference should contain only unique scopes
// 	- each security scope in a security definition should be unique
// 	- each path parameter should correspond to a parameter placeholder and vice versa
// 	- each referencable defintion must have references
// 	- each definition property listed in the required array must be defined in the properties of the model
// 	- each parameter should have a unique `name` and `type` combination
// 	- each operation should have only 1 parameter of type body
// 	- each reference must point to a valid object
// 	- every default value that is specified must validate against the schema for that property
// 	- items property is required for all schemas/definitions of type `array`
func Spec(doc *spec.Document, formats strfmt.Registry) error {
	errs, _ /*warns*/ := validate.NewSpecValidator(doc.Schema(), formats).Validate(doc)
	if errs.HasErrors() {
		return errors.CompositeValidationError(errs.Errors...)
	}
	return nil
}

func petAPIRouterBuilder(spec *spec.Document, api *untyped.API) *defaultRouteBuilder {
	builder := newDefaultRouteBuilder(spec, newRoutableUntypedAPI(spec, api, new(Context)))
	builder.AddRoute("GET", "/pets", spec.AllPaths()["/pets"].Get)
	builder.AddRoute("POST", "/pets", spec.AllPaths()["/pets"].Post)
	builder.AddRoute("DELETE", "/pets/{id}", spec.AllPaths()["/pets/{id}"].Delete)
	builder.AddRoute("GET", "/pets/{id}", spec.AllPaths()["/pets/{id}"].Get)

	return builder
}

func gatherModels(specDoc *spec.Document, modelNames []string) map[string]spec.Schema {
	models, mnc := make(map[string]spec.Schema), len(modelNames)
	for k, v := range specDoc.Spec().Definitions {
		for _, nm := range modelNames {
			if mnc == 0 || k == nm {
				models[k] = v
			}
		}
	}
	return models
}

func newRoutableUntypedAPI(spec *spec.Document, api *untyped.API, context *Context) *routableUntypedAPI {
	var handlers map[string]http.Handler
	if spec == nil || api == nil {
		return nil
	}
	for _, hls := range spec.Operations() {
		for _, op := range hls {
			schemes := spec.SecurityDefinitionsFor(op)

			if oh, ok := api.OperationHandlerFor(op.ID); ok {
				if handlers == nil {
					handlers = make(map[string]http.Handler)
				}

				handlers[op.ID] = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
					// lookup route info in the context
					route, _ := context.RouteInfo(r)

					// bind and validate the request using reflection
					bound, validation := context.BindAndValidate(r, route)
					if validation != nil {
						context.Respond(w, r, route.Produces, route, validation)
						return
					}

					// actually handle the request
					result, err := oh.Handle(bound)
					if err != nil {
						// respond with failure
						context.Respond(w, r, route.Produces, route, err)
						return
					}

					// respond with success
					context.Respond(w, r, route.Produces, route, result)
				})

				if len(schemes) > 0 {
					handlers[op.ID] = newSecureAPI(context, handlers[op.ID])
				}
			}
		}
	}

	return &routableUntypedAPI{
		api:             api,
		handlers:        handlers,
		defaultProduces: api.DefaultProduces,
		defaultConsumes: api.DefaultConsumes,
	}
}

// DefaultRouter creates a default implemenation of the router
func DefaultRouter(spec *spec.Document, api RoutableAPI) Router {
	builder := newDefaultRouteBuilder(spec, api)
	if spec != nil {
		for method, paths := range spec.Operations() {
			for path, operation := range paths {
				builder.AddRoute(method, path, operation)
			}
		}
	}
	return builder.Build()
}

// Validate validates the swagger spec
func (s *SpecValidator) Validate(data interface{}) (errs *Result, warnings *Result) {
	var sd *spec.Document

	switch v := data.(type) {
	case *spec.Document:
		sd = v
	}
	if sd == nil {
		errs = sErr(errors.New(500, "spec validator can only validate spec.Document objects"))
		return
	}
	s.spec = sd

	errs = new(Result)
	warnings = new(Result)

	schv := NewSchemaValidator(s.schema, nil, "", s.KnownFormats)
	errs.Merge(schv.Validate(sd.Spec())) // error -
	if errs.HasErrors() {
		return // no point in continuing
	}

	errs.Merge(s.validateReferencesValid()) // error -
	if errs.HasErrors() {
		return // no point in continuing
	}

	errs.Merge(s.validateDuplicatePropertyNames())         // error -
	errs.Merge(s.validateParameters())                     // error -
	errs.Merge(s.validateItems())                          // error -
	errs.Merge(s.validateRequiredDefinitions())            // error -
	errs.Merge(s.validateDefaultValueValidAgainstSchema()) // error -
	errs.Merge(s.validateExamplesValidAgainstSchema())     // error -

	warnings.Merge(s.validateUniqueSecurityScopes())            // warning
	warnings.Merge(s.validateUniqueScopesSecurityDefinitions()) // warning
	warnings.Merge(s.validateReferenced())                      // warning

	return
}

// New creates a new default runtime for a swagger api client.
func New(swaggerSpec *spec.Document, host string) *Runtime {
	var rt Runtime
	rt.DefaultMediaType = httpkit.JSONMime
	rt.Consumers = map[string]httpkit.Consumer{
		httpkit.JSONMime: httpkit.JSONConsumer(),
	}
	rt.Producers = map[string]httpkit.Producer{
		httpkit.JSONMime: httpkit.JSONProducer(),
	}
	rt.Spec = swaggerSpec
	rt.Transport = http.DefaultTransport
	rt.client = http.DefaultClient
	rt.Host = host
	rt.BasePath = swaggerSpec.BasePath()
	rt.methodsAndPaths = make(map[string]methodAndPath)
	for mth, pathItem := range rt.Spec.Operations() {
		for pth, op := range pathItem {
			rt.methodsAndPaths[op.ID] = methodAndPath{mth, pth}
		}
	}
	return &rt
}

func appNameOrDefault(specDoc *spec.Document, name, defaultName string) string {
	if name == "" {
		if specDoc.Spec().Info != nil && specDoc.Spec().Info.Title != "" {
			name = specDoc.Spec().Info.Title
		} else {
			name = defaultName
		}
	}
	return swag.ToGoName(name)
}

func gatherOperations(specDoc *spec.Document, operationIDs []string) map[string]spec.Operation {
	operations := make(map[string]spec.Operation)
	if len(operationIDs) == 0 {
		for _, k := range specDoc.OperationIDs() {
			if op, ok := specDoc.OperationForName(k); ok {
				operations[k] = *op
			}
		}
	} else {
		for _, k := range specDoc.OperationIDs() {
			for _, nm := range operationIDs {
				if k == nm {
					if op, ok := specDoc.OperationForName(k); ok {
						operations[k] = *op
					}
				}
			}
		}
	}
	return operations
}