package models

import (
	"encoding/base64"
	"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"
)

const RootFolderName = "General"

// Typed errors
var (
	ErrDashboardNotFound = DashboardErr{
		Reason:     "Dashboard not found",
		StatusCode: 404,
		Status:     "not-found",
	}
	ErrDashboardCorrupt = DashboardErr{
		Reason:     "Dashboard data is missing or corrupt",
		StatusCode: 500,
		Status:     "not-found",
	}
	ErrDashboardPanelNotFound = DashboardErr{
		Reason:     "Dashboard panel not found",
		StatusCode: 404,
		Status:     "not-found",
	}
	ErrDashboardFolderNotFound = DashboardErr{
		Reason:     "Folder not found",
		StatusCode: 404,
	}
	ErrDashboardSnapshotNotFound = DashboardErr{
		Reason:     "Dashboard snapshot not found",
		StatusCode: 404,
	}
	ErrDashboardWithSameUIDExists = DashboardErr{
		Reason:     "A dashboard with the same uid already exists",
		StatusCode: 400,
	}
	ErrDashboardWithSameNameInFolderExists = DashboardErr{
		Reason:     "A dashboard with the same name in the folder already exists",
		StatusCode: 412,
		Status:     "name-exists",
	}
	ErrDashboardVersionMismatch = DashboardErr{
		Reason:     "The dashboard has been changed by someone else",
		StatusCode: 412,
		Status:     "version-mismatch",
	}
	ErrDashboardTitleEmpty = DashboardErr{
		Reason:     "Dashboard title cannot be empty",
		StatusCode: 400,
		Status:     "empty-name",
	}
	ErrDashboardFolderCannotHaveParent = DashboardErr{
		Reason:     "A Dashboard Folder cannot be added to another folder",
		StatusCode: 400,
	}
	ErrDashboardsWithSameSlugExists = DashboardErr{
		Reason:     "Multiple dashboards with the same slug exists",
		StatusCode: 412,
	}
	ErrDashboardFailedGenerateUniqueUid = DashboardErr{
		Reason:     "Failed to generate unique dashboard id",
		StatusCode: 500,
	}
	ErrDashboardTypeMismatch = DashboardErr{
		Reason:     "Dashboard cannot be changed to a folder",
		StatusCode: 400,
	}
	ErrDashboardFolderWithSameNameAsDashboard = DashboardErr{
		Reason:     "Folder name cannot be the same as one of its dashboards",
		StatusCode: 400,
	}
	ErrDashboardWithSameNameAsFolder = DashboardErr{
		Reason:     "Dashboard name cannot be the same as folder",
		StatusCode: 400,
		Status:     "name-match",
	}
	ErrDashboardFolderNameExists = DashboardErr{
		Reason:     "A folder with that name already exists",
		StatusCode: 400,
	}
	ErrDashboardUpdateAccessDenied = DashboardErr{
		Reason:     "Access denied to save dashboard",
		StatusCode: 403,
	}
	ErrDashboardInvalidUid = DashboardErr{
		Reason:     "uid contains illegal characters",
		StatusCode: 400,
	}
	ErrDashboardUidTooLong = DashboardErr{
		Reason:     "uid too long, max 40 characters",
		StatusCode: 400,
	}
	ErrDashboardCannotSaveProvisionedDashboard = DashboardErr{
		Reason:     "Cannot save provisioned dashboard",
		StatusCode: 400,
	}
	ErrDashboardRefreshIntervalTooShort = DashboardErr{
		Reason:     "Dashboard refresh interval is too low",
		StatusCode: 400,
	}
	ErrDashboardCannotDeleteProvisionedDashboard = DashboardErr{
		Reason:     "provisioned dashboard cannot be deleted",
		StatusCode: 400,
	}
	ErrDashboardIdentifierNotSet = DashboardErr{
		Reason:     "Unique identifier needed to be able to get a dashboard",
		StatusCode: 400,
	}
	ErrDashboardIdentifierInvalid = DashboardErr{
		Reason:     "Dashboard ID not a number",
		StatusCode: 400,
	}
	ErrDashboardPanelIdentifierInvalid = DashboardErr{
		Reason:     "Dashboard panel ID not a number",
		StatusCode: 400,
	}
	ErrDashboardOrPanelIdentifierNotSet = DashboardErr{
		Reason:     "Unique identifier needed to be able to get a dashboard panel",
		StatusCode: 400,
	}
	ErrProvisionedDashboardNotFound = DashboardErr{
		Reason:     "Dashboard is not provisioned",
		StatusCode: 404,
		Status:     "not-found",
	}
	ErrDashboardThumbnailNotFound = DashboardErr{
		Reason:     "Dashboard thumbnail not found",
		StatusCode: 404,
		Status:     "not-found",
	}
)

// DashboardErr represents a dashboard error.
type DashboardErr struct {
	StatusCode int
	Status     string
	Reason     string
}

// Equal returns whether equal to another DashboardErr.
func (e DashboardErr) Equal(o DashboardErr) bool {
	return o.StatusCode == e.StatusCode && o.Status == e.Status && o.Reason == e.Reason
}

// Error returns the error message.
func (e DashboardErr) Error() string {
	if e.Reason != "" {
		return e.Reason
	}
	return "Dashboard Error"
}

// Body returns the error's response body, if applicable.
func (e DashboardErr) Body() util.DynMap {
	if e.Status == "" {
		return nil
	}

	return util.DynMap{"status": e.Status, "message": e.Error()}
}

type UpdatePluginDashboardError struct {
	PluginId string
}

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

const (
	DashTypeDB       = "db"
	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
	IsPublic  bool

	Title string
	Data  *simplejson.Json
}

type PublicDashboardConfig struct {
	IsPublic bool `json:"isPublic"`
}

func (d *Dashboard) SetId(id int64) {
	d.Id = id
	d.Data.Set("id", id)
}

func (d *Dashboard) SetUid(uid string) {
	d.Uid = uid
	d.Data.Set("uid", uid)
}

func (d *Dashboard) SetVersion(version int) {
	d.Version = version
	d.Data.Set("version", version)
}

// GetDashboardIdForSavePermissionCheck return the dashboard id to be used for checking permission of dashboard
func (d *Dashboard) GetDashboardIdForSavePermissionCheck() int64 {
	if d.Id == 0 {
		return d.FolderId
	}

	return d.Id
}

// NewDashboard creates a new dashboard
func NewDashboard(title string) *Dashboard {
	dash := &Dashboard{}
	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.IsFolder = true
	folder.Data.Set("schemaVersion", 17)
	folder.Data.Set("version", 0)
	folder.IsFolder = true
	return folder
}

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

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

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

	if uid, err := dash.Data.Get("uid").String(); err == nil {
		dash.Uid = uid
		update = true
	}

	if version, err := dash.Data.Get("version").Float64(); err == nil && update {
		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)
	}

	return dash
}

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

	if userId == 0 {
		userId = -1
	}

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

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

func SlugifyTitle(title string) string {
	s := slug.Make(strings.ToLower(title))
	if s == "" {
		// If the dashboard name is only characters outside of the
		// sluggable characters, the slug creation will return an
		// empty string which will mess up URLs. This failsafe picks
		// that up and creates the slug as a base64 identifier instead.
		s = base64.RawURLEncoding.EncodeToString([]byte(title))
		if slug.MaxLength != 0 && len(s) > slug.MaxLength {
			s = s[:slug.MaxLength]
		}
	}
	return s
}

// GetUrl return the html url for a folder if it's folder, otherwise for a dashboard
func (d *Dashboard) GetUrl() string {
	return GetDashboardFolderUrl(d.IsFolder, d.Uid, d.Slug)
}

// GetDashboardFolderUrl return the html url for a folder if it's folder, otherwise for a dashboard
func GetDashboardFolderUrl(isFolder bool, uid string, slug string) string {
	if isFolder {
		return GetFolderUrl(uid, slug)
	}

	return GetDashboardUrl(uid, slug)
}

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

// GetKioskModeDashboardUrl returns the HTML url for a dashboard in kiosk mode.
func GetKioskModeDashboardUrl(uid string, slug string, theme Theme) string {
	return fmt.Sprintf("%s?kiosk&theme=%s", GetDashboardUrl(uid, slug), string(theme))
}

// GetFullDashboardUrl returns the full URL for a dashboard.
func GetFullDashboardUrl(uid string, slug string) string {
	return fmt.Sprintf("%sd/%s/%s", setting.AppUrl, uid, slug)
}

// GetFolderUrl returns 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)
}

type ValidateDashboardBeforeSaveResult struct {
	IsParentFolderChanged bool
}

//
// 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"`
	FolderUid    string           `json:"folderUid"`
	IsFolder     bool             `json:"isFolder"`

	UpdatedAt time.Time

	Result *Dashboard `json:"-"`
}

type TrimDashboardCommand struct {
	Dashboard *simplejson.Json `json:"dashboard" binding:"Required"`
	Meta      *simplejson.Json `json:"meta"`
	Result    *Dashboard       `json:"-"`
}

type DashboardProvisioning struct {
	Id          int64
	DashboardId int64
	Name        string
	ExternalId  string
	CheckSum    string
	Updated     int64
}

type DeleteDashboardCommand struct {
	Id                     int64
	OrgId                  int64
	ForceDeleteFolderRules bool
}

type DeleteOrphanedProvisionedDashboardsCommand struct {
	ReaderNames []string
}

type SavePublicDashboardConfigCommand struct {
	Uid                   string
	OrgId                 int64
	PublicDashboardConfig PublicDashboardConfig
}

//
// 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
	DashboardUIds []string
	Result        []*Dashboard
}

type GetDashboardPermissionsForUserQuery struct {
	DashboardIds []int64
	OrgId        int64
	UserId       int64
	OrgRole      RoleType
	Result       []*DashboardPermissionForUser
}

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
}

type DashboardPermissionForUser struct {
	DashboardId    int64          `json:"dashboardId"`
	Permission     PermissionType `json:"permission"`
	PermissionName string         `json:"permissionName"`
}

type DashboardRef struct {
	Uid  string
	Slug string
}

type GetDashboardRefByIdQuery struct {
	Id     int64
	Result *DashboardRef
}