/*
 * Datadog API for Go
 *
 * Please see the included LICENSE file for licensing information.
 *
 * Copyright 2013 by authors and contributors.
 */

package datadog

import (
	"encoding/json"
	"fmt"
)

// GraphDefinitionRequest represents the requests passed into each graph.
type GraphDefinitionRequest struct {
	Query              string `json:"q"`
	Stacked            bool   `json:"stacked"`
	Aggregator         string
	ConditionalFormats []DashboardConditionalFormat `json:"conditional_formats,omitempty"`
	Type               string                       `json:"type,omitempty"`
	Style              *struct {
		Palette *string `json:"palette,omitempty"`
		Width   *string `json:"width,omitempty"`
		Type    *string `json:"type,omitempty"`
	} `json:"style,omitempty"`

	// For change type graphs
	ChangeType     string `json:"change_type,omitempty"`
	OrderDirection string `json:"order_dir,omitempty"`
	CompareTo      string `json:"compare_to,omitempty"`
	IncreaseGood   bool   `json:"increase_good,omitempty"`
	OrderBy        string `json:"order_by,omitempty"`
	ExtraCol       string `json:"extra_col,omitempty"`
}

type GraphDefinitionMarker struct {
	Type  string      `json:"type"`
	Value string      `json:"value"`
	Label string      `json:"label,omitempty"`
	Val   json.Number `json:"val,omitempty"`
	Min   json.Number `json:"min,omitempty"`
	Max   json.Number `json:"max,omitempty"`
}

// Graph represents a graph that might exist on a dashboard.
type Graph struct {
	Title      string `json:"title"`
	Definition struct {
		Viz      string                   `json:"viz"`
		Requests []GraphDefinitionRequest `json:"requests"`
		Events   []struct {
			Query string `json:"q"`
		} `json:"events"`
		Markers []GraphDefinitionMarker `json:"markers,omitempty"`

		// For timeseries type graphs
		Yaxis struct {
			Min   *float64 `json:"min,omitempty"`
			Max   *float64 `json:"max,omitempty"`
			Scale *string  `json:"scale,omitempty"`
		} `json:"yaxis,omitempty"`

		// For query value type graphs
		Autoscale  bool   `json:"austoscale,omitempty"`
		TextAlign  string `json:"text_align,omitempty"`
		Precision  string `json:"precision,omitempty"`
		CustomUnit string `json:"custom_unit,omitempty"`

		// For hostnamp type graphs
		Style *struct {
			Palette     *string `json:"palette,omitempty"`
			PaletteFlip *bool   `json:"paletteFlip,omitempty"`
		}
		Groups                []string `json:"group,omitempty"`
		IncludeNoMetricHosts  bool     `json:"noMetricHosts,omitempty"`
		Scopes                []string `json:"scope,omitempty"`
		IncludeUngroupedHosts bool     `json:"noGroupHosts,omitempty"`
	} `json:"definition"`
}

// Template variable represents a template variable that might exist on a dashboard
type TemplateVariable struct {
	Name    string `json:"name"`
	Prefix  string `json:"prefix"`
	Default string `json:"default"`
}

// Dashboard represents a user created dashboard. This is the full dashboard
// struct when we load a dashboard in detail.
type Dashboard struct {
	Id                int                `json:"id"`
	Description       string             `json:"description"`
	Title             string             `json:"title"`
	Graphs            []Graph            `json:"graphs"`
	TemplateVariables []TemplateVariable `json:"template_variables,omitempty"`
	ReadOnly          bool               `json:"read_only"`
}

// DashboardLite represents a user created dashboard. This is the mini
// struct when we load the summaries.
type DashboardLite struct {
	Id          int    `json:"id,string"` // TODO: Remove ',string'.
	Resource    string `json:"resource"`
	Description string `json:"description"`
	Title       string `json:"title"`
}

// reqGetDashboards from /api/v1/dash
type reqGetDashboards struct {
	Dashboards []DashboardLite `json:"dashes"`
}

// reqGetDashboard from /api/v1/dash/:dashboard_id
type reqGetDashboard struct {
	Resource  string    `json:"resource"`
	Url       string    `json:"url"`
	Dashboard Dashboard `json:"dash"`
}

type DashboardConditionalFormat struct {
	Palette       string      `json:"palette,omitempty"`
	Comparator    string      `json:"comparator,omitempty"`
	CustomBgColor string      `json:"custom_bg_color,omitempty"`
	Value         json.Number `json:"value,omitempty"`
	Inverted      bool        `json:"invert,omitempty"`
	CustomFgColor string      `json:"custom_fg_color,omitempty"`
}

// GetDashboard returns a single dashboard created on this account.
func (client *Client) GetDashboard(id int) (*Dashboard, error) {
	var out reqGetDashboard
	if err := client.doJsonRequest("GET", fmt.Sprintf("/v1/dash/%d", id), nil, &out); err != nil {
		return nil, err
	}
	return &out.Dashboard, nil
}

// GetDashboards returns a list of all dashboards created on this account.
func (client *Client) GetDashboards() ([]DashboardLite, error) {
	var out reqGetDashboards
	if err := client.doJsonRequest("GET", "/v1/dash", nil, &out); err != nil {
		return nil, err
	}
	return out.Dashboards, nil
}

// DeleteDashboard deletes a dashboard by the identifier.
func (client *Client) DeleteDashboard(id int) error {
	return client.doJsonRequest("DELETE", fmt.Sprintf("/v1/dash/%d", id), nil, nil)
}

// CreateDashboard creates a new dashboard when given a Dashboard struct. Note
// that the Id, Resource, Url and similar elements are not used in creation.
func (client *Client) CreateDashboard(dash *Dashboard) (*Dashboard, error) {
	var out reqGetDashboard
	if err := client.doJsonRequest("POST", "/v1/dash", dash, &out); err != nil {
		return nil, err
	}
	return &out.Dashboard, nil
}

// UpdateDashboard in essence takes a Dashboard struct and persists it back to
// the server. Use this if you've updated your local and need to push it back.
func (client *Client) UpdateDashboard(dash *Dashboard) error {
	return client.doJsonRequest("PUT", fmt.Sprintf("/v1/dash/%d", dash.Id),
		dash, nil)
}