package sdk

/*
   Copyright 2016 Alexander I.Grafov <grafov@gmail.com>
   Copyright 2016-2019 The Grafana SDK authors

   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.

   ॐ तारे तुत्तारे तुरे स्व
*/

import (
	"bytes"
	"encoding/json"
	"strings"

	"github.com/gosimple/slug"
)

var (
	boardID uint
)

// Constants for templating
const (
	TemplatingHideNone = iota
	TemplatingHideLabel
	TemplatingHideVariable
)

type (
	// Board represents Grafana dashboard.
	Board struct {
		ID              uint       `json:"id,omitempty"`
		UID             string     `json:"uid,omitempty"`
		Slug            string     `json:"slug"`
		Title           string     `json:"title"`
		OriginalTitle   string     `json:"originalTitle"`
		Tags            []string   `json:"tags"`
		Style           string     `json:"style"`
		Timezone        string     `json:"timezone"`
		Editable        bool       `json:"editable"`
		HideControls    bool       `json:"hideControls" graf:"hide-controls"`
		SharedCrosshair bool       `json:"sharedCrosshair" graf:"shared-crosshair"`
		Panels          []*Panel   `json:"panels"`
		Rows            []*Row     `json:"rows"`
		Templating      Templating `json:"templating"`
		Annotations     struct {
			List []Annotation `json:"list"`
		} `json:"annotations"`
		Refresh       *BoolString `json:"refresh,omitempty"`
		SchemaVersion uint        `json:"schemaVersion"`
		Version       uint        `json:"version"`
		Links         []Link      `json:"links"`
		Time          Time        `json:"time"`
		Timepicker    Timepicker  `json:"timepicker"`
		GraphTooltip  int         `json:"graphTooltip,omitempty"`
	}
	Time struct {
		From string `json:"from"`
		To   string `json:"to"`
	}
	Timepicker struct {
		Now              *bool    `json:"now,omitempty"`
		RefreshIntervals []string `json:"refresh_intervals"`
		TimeOptions      []string `json:"time_options"`
	}
	Templating struct {
		List []TemplateVar `json:"list"`
	}
	TemplateVar struct {
		Name        string      `json:"name"`
		Type        string      `json:"type"`
		Auto        bool        `json:"auto,omitempty"`
		AutoCount   *int        `json:"auto_count,omitempty"`
		Datasource  *string     `json:"datasource"`
		Refresh     BoolInt     `json:"refresh"`
		Options     []Option    `json:"options"`
		IncludeAll  bool        `json:"includeAll"`
		AllFormat   string      `json:"allFormat"`
		AllValue    string      `json:"allValue"`
		Multi       bool        `json:"multi"`
		MultiFormat string      `json:"multiFormat"`
		Query       interface{} `json:"query"`
		Regex       string      `json:"regex"`
		Current     Current     `json:"current"`
		Label       string      `json:"label"`
		Hide        uint8       `json:"hide"`
		Sort        int         `json:"sort"`
	}
	// for templateVar
	Option struct {
		Text     string `json:"text"`
		Value    string `json:"value"`
		Selected bool   `json:"selected"`
	}
	// for templateVar
	Current struct {
		Tags  []*string          `json:"tags,omitempty"`
		Text  *StringSliceString `json:"text"`
		Value interface{}        `json:"value"` // TODO select more precise type
	}
	Annotation struct {
		Name        string   `json:"name"`
		Datasource  *string  `json:"datasource"`
		ShowLine    bool     `json:"showLine"`
		IconColor   string   `json:"iconColor"`
		LineColor   string   `json:"lineColor"`
		IconSize    uint     `json:"iconSize"`
		Enable      bool     `json:"enable"`
		Query       string   `json:"query"`
		Expr        string   `json:"expr"`
		Step        string   `json:"step"`
		TextField   string   `json:"textField"`
		TextFormat  string   `json:"textFormat"`
		TitleFormat string   `json:"titleFormat"`
		TagsField   string   `json:"tagsField"`
		Tags        []string `json:"tags"`
		TagKeys     string   `json:"tagKeys"`
		Type        string   `json:"type"`
	}
	// Link represents link to another dashboard or external weblink
	Link struct {
		Title       string   `json:"title"`
		Type        string   `json:"type"`
		AsDropdown  *bool    `json:"asDropdown,omitempty"`
		DashURI     *string  `json:"dashUri,omitempty"`
		Dashboard   *string  `json:"dashboard,omitempty"`
		Icon        *string  `json:"icon,omitempty"`
		IncludeVars bool     `json:"includeVars"`
		KeepTime    *bool    `json:"keepTime,omitempty"`
		Params      *string  `json:"params,omitempty"`
		Tags        []string `json:"tags,omitempty"`
		TargetBlank *bool    `json:"targetBlank,omitempty"`
		Tooltip     *string  `json:"tooltip,omitempty"`
		URL         *string  `json:"url,omitempty"`
	}
)

// Height of rows maybe passed as number (ex 200) or
// as string (ex "200px") or empty string
type Height string

func (h *Height) UnmarshalJSON(raw []byte) error {
	if raw == nil || bytes.Equal(raw, []byte(`"null"`)) {
		return nil
	}
	if raw[0] != '"' {
		tmp := []byte{'"'}
		raw = append(tmp, raw...)
		raw = append(raw, byte('"'))
	}
	var tmp string
	err := json.Unmarshal(raw, &tmp)
	*h = Height(tmp)
	return err
}

func NewBoard(title string) *Board {
	boardID++
	return &Board{
		ID:           boardID,
		Title:        title,
		Style:        "dark",
		Timezone:     "browser",
		Editable:     true,
		HideControls: false,
		Rows:         []*Row{},
	}
}

func (b *Board) AddLink(link Link) {
	b.Links = append(b.Links, link)
}

func (b *Board) RemoveTags(tags ...string) {
	// order might change after removing the tags
	for _, toRemoveTag := range tags {
		tagLen := len(b.Tags)
		for i, tag := range b.Tags {
			if tag == toRemoveTag {
				b.Tags[tagLen-1], b.Tags[i] = b.Tags[i], b.Tags[tagLen-1]
				b.Tags = b.Tags[:tagLen-1]
				break
			}
		}
	}
}

func (b *Board) AddTags(tags ...string) {
	tagFound := make(map[string]bool, len(b.Tags))
	for _, tag := range b.Tags {
		tagFound[tag] = true
	}
	for _, tag := range tags {
		if tagFound[tag] {
			continue
		}
		b.Tags = append(b.Tags, tag)
		tagFound[tag] = true
	}
}

func (b *Board) HasTag(tag string) bool {
	for _, t := range b.Tags {
		if t == tag {
			return true
		}
	}
	return false
}

func (b *Board) AddRow(title string) *Row {
	if title == "" {
		title = "New row"
	}
	row := &Row{
		Title:    title,
		Collapse: false,
		Editable: true,
		Height:   "250px",
	}
	b.Rows = append(b.Rows, row)
	return row
}

func (b *Board) UpdateSlug() string {
	b.Slug = strings.ToLower(slug.Make(b.Title))
	return b.Slug
}