package restful

import "sort"

// Copyright 2013 Ernest Micklei. All rights reserved.
// Use of this source code is governed by a license
// that can be found in the LICENSE file.

const (
	// PathParameterKind = indicator of Request parameter type "path"
	PathParameterKind = iota

	// QueryParameterKind = indicator of Request parameter type "query"
	QueryParameterKind

	// BodyParameterKind = indicator of Request parameter type "body"
	BodyParameterKind

	// HeaderParameterKind = indicator of Request parameter type "header"
	HeaderParameterKind

	// FormParameterKind = indicator of Request parameter type "form"
	FormParameterKind

	// CollectionFormatCSV comma separated values `foo,bar`
	CollectionFormatCSV = CollectionFormat("csv")

	// CollectionFormatSSV space separated values `foo bar`
	CollectionFormatSSV = CollectionFormat("ssv")

	// CollectionFormatTSV tab separated values `foo\tbar`
	CollectionFormatTSV = CollectionFormat("tsv")

	// CollectionFormatPipes pipe separated values `foo|bar`
	CollectionFormatPipes = CollectionFormat("pipes")

	// CollectionFormatMulti corresponds to multiple parameter instances instead of multiple values for a single
	// instance `foo=bar&foo=baz`. This is valid only for QueryParameters and FormParameters
	CollectionFormatMulti = CollectionFormat("multi")
)

type CollectionFormat string

func (cf CollectionFormat) String() string {
	return string(cf)
}

// Parameter is for documententing the parameter used in a Http Request
// ParameterData kinds are Path,Query and Body
type Parameter struct {
	data *ParameterData
}

// ParameterData represents the state of a Parameter.
// It is made public to make it accessible to e.g. the Swagger package.
type ParameterData struct {
	ExtensionProperties
	Name, Description, DataType, DataFormat string
	Kind                                    int
	Required                                bool
	// AllowableValues is deprecated. Use PossibleValues instead
	AllowableValues  map[string]string
	PossibleValues   []string
	AllowMultiple    bool
	AllowEmptyValue  bool
	DefaultValue     string
	CollectionFormat string
	Pattern          string
	Minimum          *float64
	Maximum          *float64
	MinLength        *int64
	MaxLength        *int64
	MinItems         *int64
	MaxItems         *int64
	UniqueItems      bool
}

// Data returns the state of the Parameter
func (p *Parameter) Data() ParameterData {
	return *p.data
}

// Kind returns the parameter type indicator (see const for valid values)
func (p *Parameter) Kind() int {
	return p.data.Kind
}

func (p *Parameter) bePath() *Parameter {
	p.data.Kind = PathParameterKind
	return p
}
func (p *Parameter) beQuery() *Parameter {
	p.data.Kind = QueryParameterKind
	return p
}
func (p *Parameter) beBody() *Parameter {
	p.data.Kind = BodyParameterKind
	return p
}

func (p *Parameter) beHeader() *Parameter {
	p.data.Kind = HeaderParameterKind
	return p
}

func (p *Parameter) beForm() *Parameter {
	p.data.Kind = FormParameterKind
	return p
}

// Required sets the required field and returns the receiver
func (p *Parameter) Required(required bool) *Parameter {
	p.data.Required = required
	return p
}

// AllowMultiple sets the allowMultiple field and returns the receiver
func (p *Parameter) AllowMultiple(multiple bool) *Parameter {
	p.data.AllowMultiple = multiple
	return p
}

// AddExtension adds or updates a key=value pair to the extension map
func (p *Parameter) AddExtension(key string, value interface{}) *Parameter {
	p.data.AddExtension(key, value)
	return p
}

// AllowEmptyValue sets the AllowEmptyValue field and returns the receiver
func (p *Parameter) AllowEmptyValue(multiple bool) *Parameter {
	p.data.AllowEmptyValue = multiple
	return p
}

// AllowableValues is deprecated. Use PossibleValues instead. Both will be set.
func (p *Parameter) AllowableValues(values map[string]string) *Parameter {
	p.data.AllowableValues = values

	allowableSortedKeys := make([]string, 0, len(values))
	for k := range values {
		allowableSortedKeys = append(allowableSortedKeys, k)
	}
	sort.Strings(allowableSortedKeys)

	p.data.PossibleValues = make([]string, 0, len(values))
	for _, k := range allowableSortedKeys {
		p.data.PossibleValues = append(p.data.PossibleValues, values[k])
	}
	return p
}

// PossibleValues sets the possible values field and returns the receiver
func (p *Parameter) PossibleValues(values []string) *Parameter {
	p.data.PossibleValues = values
	return p
}

// DataType sets the dataType field and returns the receiver
func (p *Parameter) DataType(typeName string) *Parameter {
	p.data.DataType = typeName
	return p
}

// DataFormat sets the dataFormat field for Swagger UI
func (p *Parameter) DataFormat(formatName string) *Parameter {
	p.data.DataFormat = formatName
	return p
}

// DefaultValue sets the default value field and returns the receiver
func (p *Parameter) DefaultValue(stringRepresentation string) *Parameter {
	p.data.DefaultValue = stringRepresentation
	return p
}

// Description sets the description value field and returns the receiver
func (p *Parameter) Description(doc string) *Parameter {
	p.data.Description = doc
	return p
}

// CollectionFormat sets the collection format for an array type
func (p *Parameter) CollectionFormat(format CollectionFormat) *Parameter {
	p.data.CollectionFormat = format.String()
	return p
}

// Pattern sets the pattern field and returns the receiver
func (p *Parameter) Pattern(pattern string) *Parameter {
	p.data.Pattern = pattern
	return p
}

// Minimum sets the minimum field and returns the receiver
func (p *Parameter) Minimum(minimum float64) *Parameter {
	p.data.Minimum = &minimum
	return p
}

// Maximum sets the maximum field and returns the receiver
func (p *Parameter) Maximum(maximum float64) *Parameter {
	p.data.Maximum = &maximum
	return p
}

// MinLength sets the minLength field and returns the receiver
func (p *Parameter) MinLength(minLength int64) *Parameter {
	p.data.MinLength = &minLength
	return p
}

// MaxLength sets the maxLength field and returns the receiver
func (p *Parameter) MaxLength(maxLength int64) *Parameter {
	p.data.MaxLength = &maxLength
	return p
}

// MinItems sets the minItems field and returns the receiver
func (p *Parameter) MinItems(minItems int64) *Parameter {
	p.data.MinItems = &minItems
	return p
}

// MaxItems sets the maxItems field and returns the receiver
func (p *Parameter) MaxItems(maxItems int64) *Parameter {
	p.data.MaxItems = &maxItems
	return p
}

// UniqueItems sets the uniqueItems field and returns the receiver
func (p *Parameter) UniqueItems(uniqueItems bool) *Parameter {
	p.data.UniqueItems = uniqueItems
	return p
}