package openapi3filter

import (
	"bytes"
	"fmt"

	"github.com/getkin/kin-openapi/openapi3"
)

var _ error = &RequestError{}

// RequestError is returned by ValidateRequest when request does not match OpenAPI spec
type RequestError struct {
	Input       *RequestValidationInput
	Parameter   *openapi3.Parameter
	RequestBody *openapi3.RequestBody
	Reason      string
	Err         error
}

var _ interface{ Unwrap() error } = RequestError{}

func (err *RequestError) Error() string {
	reason := err.Reason
	if e := err.Err; e != nil {
		if len(reason) == 0 || reason == e.Error() {
			reason = e.Error()
		} else {
			reason += ": " + e.Error()
		}
	}
	if v := err.Parameter; v != nil {
		return fmt.Sprintf("parameter %q in %s has an error: %s", v.Name, v.In, reason)
	} else if v := err.RequestBody; v != nil {
		return fmt.Sprintf("request body has an error: %s", reason)
	} else {
		return reason
	}
}

func (err RequestError) Unwrap() error {
	return err.Err
}

var _ error = &ResponseError{}

// ResponseError is returned by ValidateResponse when response does not match OpenAPI spec
type ResponseError struct {
	Input  *ResponseValidationInput
	Reason string
	Err    error
}

var _ interface{ Unwrap() error } = ResponseError{}

func (err *ResponseError) Error() string {
	reason := err.Reason
	if e := err.Err; e != nil {
		if len(reason) == 0 {
			reason = e.Error()
		} else {
			reason += ": " + e.Error()
		}
	}
	return reason
}

func (err ResponseError) Unwrap() error {
	return err.Err
}

var _ error = &SecurityRequirementsError{}

// SecurityRequirementsError is returned by ValidateSecurityRequirements
// when no requirement is met.
type SecurityRequirementsError struct {
	SecurityRequirements openapi3.SecurityRequirements
	Errors               []error
}

func (err *SecurityRequirementsError) Error() string {
	buff := bytes.NewBufferString("security requirements failed: ")
	for i, e := range err.Errors {
		buff.WriteString(e.Error())
		if i != len(err.Errors)-1 {
			buff.WriteString(" | ")
		}
	}

	return buff.String()
}
