package models

import (
	"errors"
	"fmt"
	"strings"
	"time"

	"github.com/gosimple/slug"
	"github.com/grafana/grafana/pkg/components/simplejson"
	"github.com/grafana/grafana/pkg/setting"
	"github.com/grafana/grafana/pkg/util"
)

// Typed errors
var (
	ErrDashboardNotFound                 = errors.New("Dashboard not found")
	ErrDashboardSnapshotNotFound         = errors.New("Dashboard snapshot not found")
	ErrDashboardWithSameNameExists       = errors.New("A dashboard with the same name already exists")
	ErrDashboardVersionMismatch          = errors.New("The dashboard has been changed by someone else")
	ErrDashboardTitleEmpty               = errors.New("Dashboard title cannot be empty")
	ErrDashboardFolderCannotHaveParent   = errors.New("A Dashboard Folder cannot be added to another folder")
	ErrDashboardContainsInvalidAlertData = errors.New("Invalid alert data. Cannot save dashboard")
	ErrDashboardFailedToUpdateAlertData  = errors.New("Failed to save alert data")
	ErrDashboardsWithSameSlugExists      = errors.New("Multiple dashboards with the same slug exists")
)

type UpdatePluginDashboardError struct {
	PluginId string
}

func (d UpdatePluginDashboardError) Error() string {
	return "Dashboard belong to plugin"
}

var (
	DashTypeJson     = "file"
	DashTypeDB       = "db"
	DashTypeScript   = "script"
	DashTypeSnapshot = "snapshot"
)

// Dashboard model
type Dashboard struct {
	Id       int64
	Uid      string
	Slug     string
	OrgId    int64
	GnetId   int64
	Version  int
	PluginId string

	Created time.Time
	Updated time.Time

	UpdatedBy int64
	CreatedBy int64
	FolderId  int64
	IsFolder  bool
	HasAcl    bool

	Title string
	Data  *simplejson.Json
}

// NewDashboard creates a new dashboard
func NewDashboard(title string) *Dashboard {
	dash := &Dashboard{}
	dash.Uid = util.GenerateShortUid()
	dash.Data = simplejson.New()
	dash.Data.Set("title", title)
	dash.Title = title
	dash.Created = time.Now()
	dash.Updated = time.Now()
	dash.UpdateSlug()
	return dash
}

// NewDashboardFolder creates a new dashboard folder
func NewDashboardFolder(title string) *Dashboard {
	folder := NewDashboard(title)
	folder.Data.Set("schemaVersion", 16)
	folder.Data.Set("editable", true)
	folder.Data.Set("hideControls", true)
	return folder
}

// GetTags turns the tags in data json into go string array
func (dash *Dashboard) GetTags() []string {
	return dash.Data.Get("tags").MustStringArray()
}

func NewDashboardFromJson(data *simplejson.Json) *Dashboard {
	dash := &Dashboard{}
	dash.Data = data
	dash.Title = dash.Data.Get("title").MustString()
	dash.UpdateSlug()

	if id, err := dash.Data.Get("id").Float64(); err == nil {
		dash.Id = int64(id)

		if version, err := dash.Data.Get("version").Float64(); err == nil {
			dash.Version = int(version)
			dash.Updated = time.Now()
		}
	} else {
		dash.Data.Set("version", 0)
		dash.Created = time.Now()
		dash.Updated = time.Now()
	}

	if gnetId, err := dash.Data.Get("gnetId").Float64(); err == nil {
		dash.GnetId = int64(gnetId)
	}

	if uid, err := dash.Data.Get("uid").String(); err == nil {
		dash.Uid = uid
	} else {
		dash.Uid = util.GenerateShortUid()
	}

	return dash
}

// GetDashboardModel turns the command into the savable model
func (cmd *SaveDashboardCommand) GetDashboardModel() *Dashboard {
	dash := NewDashboardFromJson(cmd.Dashboard)
	userId := cmd.UserId

	if userId == 0 {
		userId = -1
	}

	if dash.Data.Get("version").MustInt(0) == 0 {
		dash.CreatedBy = userId
	}

	dash.UpdatedBy = userId
	dash.OrgId = cmd.OrgId
	dash.PluginId = cmd.PluginId
	dash.IsFolder = cmd.IsFolder
	dash.FolderId = cmd.FolderId
	dash.UpdateSlug()
	return dash
}

// GetString a
func (dash *Dashboard) GetString(prop string, defaultValue string) string {
	return dash.Data.Get(prop).MustString(defaultValue)
}

// UpdateSlug updates the slug
func (dash *Dashboard) UpdateSlug() {
	title := dash.Data.Get("title").MustString()
	dash.Slug = SlugifyTitle(title)
}

func SlugifyTitle(title string) string {
	return slug.Make(strings.ToLower(title))
}

// GetDashboardUrl return the html url for a dashboard
func GetDashboardUrl(uid string, slug string) string {
	return fmt.Sprintf("%s/d/%s/%s", setting.AppSubUrl, uid, slug)
}

// GetFolderUrl return the html url for a folder
func GetFolderUrl(folderUid string, slug string) string {
	return fmt.Sprintf("%s/dashboards/f/%s/%s", setting.AppSubUrl, folderUid, slug)
}

//
// COMMANDS
//

type SaveDashboardCommand struct {
	Dashboard    *simplejson.Json `json:"dashboard" binding:"Required"`
	UserId       int64            `json:"userId"`
	Overwrite    bool             `json:"overwrite"`
	Message      string           `json:"message"`
	OrgId        int64            `json:"-"`
	RestoredFrom int              `json:"-"`
	PluginId     string           `json:"-"`
	FolderId     int64            `json:"folderId"`
	IsFolder     bool             `json:"isFolder"`

	UpdatedAt time.Time

	Result *Dashboard
}

type DeleteDashboardCommand struct {
	Id    int64
	OrgId int64
}

//
// QUERIES
//

type GetDashboardQuery struct {
	Slug  string // required if no Id or Uid is specified
	Id    int64  // optional if slug is set
	Uid   string // optional if slug is set
	OrgId int64

	Result *Dashboard
}

type DashboardTagCloudItem struct {
	Term  string `json:"term"`
	Count int    `json:"count"`
}

type GetDashboardTagsQuery struct {
	OrgId  int64
	Result []*DashboardTagCloudItem
}

type GetDashboardsQuery struct {
	DashboardIds []int64
	Result       []*Dashboard
}

type GetDashboardsByPluginIdQuery struct {
	OrgId    int64
	PluginId string
	Result   []*Dashboard
}

type GetDashboardSlugByIdQuery struct {
	Id     int64
	Result string
}

type GetDashboardsBySlugQuery struct {
	OrgId int64
	Slug  string

	Result []*Dashboard
}