// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.

package elastic

import (
	"encoding/json"
	"fmt"
	"net/url"

	"gopkg.in/olivere/elastic.v2/uritemplates"
)

type DeleteService struct {
	client  *Client
	index   string
	_type   string
	id      string
	routing string
	refresh *bool
	version *int
	pretty  bool
}

func NewDeleteService(client *Client) *DeleteService {
	builder := &DeleteService{
		client: client,
	}
	return builder
}

func (s *DeleteService) Index(index string) *DeleteService {
	s.index = index
	return s
}

func (s *DeleteService) Type(_type string) *DeleteService {
	s._type = _type
	return s
}

func (s *DeleteService) Id(id string) *DeleteService {
	s.id = id
	return s
}

func (s *DeleteService) Parent(parent string) *DeleteService {
	if s.routing == "" {
		s.routing = parent
	}
	return s
}

func (s *DeleteService) Refresh(refresh bool) *DeleteService {
	s.refresh = &refresh
	return s
}

func (s *DeleteService) Version(version int) *DeleteService {
	s.version = &version
	return s
}

func (s *DeleteService) Pretty(pretty bool) *DeleteService {
	s.pretty = pretty
	return s
}

// Do deletes the document. It fails if any of index, type, and identifier
// are missing.
func (s *DeleteService) Do() (*DeleteResult, error) {
	if s.index == "" {
		return nil, ErrMissingIndex
	}
	if s._type == "" {
		return nil, ErrMissingType
	}
	if s.id == "" {
		return nil, ErrMissingId
	}

	// Build url
	path, err := uritemplates.Expand("/{index}/{type}/{id}", map[string]string{
		"index": s.index,
		"type":  s._type,
		"id":    s.id,
	})
	if err != nil {
		return nil, err
	}

	// Parameters
	params := make(url.Values)
	if s.refresh != nil {
		params.Set("refresh", fmt.Sprintf("%v", *s.refresh))
	}
	if s.version != nil {
		params.Set("version", fmt.Sprintf("%d", *s.version))
	}
	if s.routing != "" {
		params.Set("routing", fmt.Sprintf("%s", s.routing))
	}
	if s.pretty {
		params.Set("pretty", fmt.Sprintf("%v", s.pretty))
	}

	// Get response
	res, err := s.client.PerformRequest("DELETE", path, params, nil)
	if err != nil {
		return nil, err
	}

	// Return response
	ret := new(DeleteResult)
	if err := json.Unmarshal(res.Body, ret); err != nil {
		return nil, err
	}
	return ret, nil
}

// -- Result of a delete request.

type DeleteResult struct {
	Found   bool   `json:"found"`
	Index   string `json:"_index"`
	Type    string `json:"_type"`
	Id      string `json:"_id"`
	Version int64  `json:"_version"`
}