// Copyright 2013 Matthew Baird
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//     http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package elastigo

import (
	"encoding/json"
	"fmt"
	"strconv"
	"strings"
)

type BaseResponse struct {
	Ok      bool             `json:"ok"`
	Index   string           `json:"_index,omitempty"`
	Type    string           `json:"_type,omitempty"`
	Id      string           `json:"_id,omitempty"`
	Source  *json.RawMessage `json:"_source,omitempty"` // depends on the schema you've defined
	Version int              `json:"_version,omitempty"`
	Found   bool             `json:"found,omitempty"`
	Exists  bool             `json:"exists,omitempty"`
	Created bool             `json:"created,omitempty"`
	Matches []string         `json:"matches,omitempty"` // percolate matches
}

// StatusInt is required because /_optimize, at least, returns its status as
// strings instead of integers.
type StatusInt int

func (self *StatusInt) UnmarshalJSON(b []byte) error {
	s := ""
	if json.Unmarshal(b, &s) == nil {
		if i, err := strconv.Atoi(s); err == nil {
			*self = StatusInt(i)
			return nil
		}
	}
	i := 0
	err := json.Unmarshal(b, &i)
	if err == nil {
		*self = StatusInt(i)
	}
	return err
}

func (self *StatusInt) MarshalJSON() ([]byte, error) {
	return json.Marshal(*self)
}

// StatusBool is required because /_optimize, at least, returns its status as
// strings instead of booleans.
type StatusBool bool

func (self *StatusBool) UnmarshalJSON(b []byte) error {
	s := ""
	if json.Unmarshal(b, &s) == nil {
		switch s {
		case "true":
			*self = StatusBool(true)
			return nil
		case "false":
			*self = StatusBool(false)
			return nil
		default:
		}
	}
	b2 := false
	err := json.Unmarshal(b, &b2)
	if err == nil {
		*self = StatusBool(b2)
	}
	return err
}

func (self *StatusBool) MarshalJSON() ([]byte, error) {
	return json.Marshal(*self)
}

type Status struct {
	Total      StatusInt `json:"total"`
	Successful StatusInt `json:"successful"`
	Failed     StatusInt `json:"failed"`
	Failures   []Failure `json:"failures,omitempty"`
}

type Failure struct {
	Index  string    `json:"index"`
	Shard  StatusInt `json:"shard"`
	Reason string    `json:"reason"`
}

func (f Failure) String() string {
	return fmt.Sprintf("Failed on shard %d on index %s:\n%s", f.Shard, f.Index, f.Reason)
}

// failures is a convenience type to allow []Failure formated easily in the
// library
type failures []Failure

func (f failures) String() string {
	message := make([]string, len(f))
	for i, failure := range f {
		message[i] = failure.String()
	}
	return strings.Join(message, "\n")
}

type ExtendedStatus struct {
	Ok           StatusBool `json:"ok"`
	ShardsStatus Status     `json:"_shards"`
}

type MatchRes struct {
	Index string `json:"_index"`
	Id    string `json:"_id"`
}

type Match struct {
	OK          bool         `json:"ok"`
	Matches     []MatchRes   `json:"matches"`
	Explanation *Explanation `json:"explanation,omitempty"`
}

type Explanation struct {
	Value       float32        `json:"value"`
	Description string         `json:"description"`
	Details     []*Explanation `json:"details,omitempty"`
}

func ScrollDuration(duration string) string {
	scrollString := ""
	if duration != "" {
		scrollString = "&scroll=" + duration
	}
	return scrollString
}

// http://www.elasticsearch.org/guide/reference/api/search/search-type/