/*
 * 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"
	"net/url"
	"strconv"
	"strings"
)

type ThresholdCount struct {
	Ok       json.Number `json:"ok,omitempty"`
	Critical json.Number `json:"critical,omitempty"`
	Warning  json.Number `json:"warning,omitempty"`
}

type NoDataTimeframe int

func (tf *NoDataTimeframe) UnmarshalJSON(data []byte) error {
	s := string(data)
	if s == "false" {
		*tf = 0
	} else {
		i, err := strconv.ParseInt(s, 10, 32)
		if err != nil {
			return err
		}
		*tf = NoDataTimeframe(i)
	}
	return nil
}

type Options struct {
	NoDataTimeframe   NoDataTimeframe `json:"no_data_timeframe,omitempty"`
	NotifyAudit       bool            `json:"notify_audit,omitempty"`
	NotifyNoData      bool            `json:"notify_no_data,omitempty"`
	NewHostDelay      *int            `json:"new_host_delay,omitempty"`
	RenotifyInterval  int             `json:"renotify_interval,omitempty"`
	Silenced          map[string]int  `json:"silenced,omitempty"`
	TimeoutH          int             `json:"timeout_h,omitempty"`
	EscalationMessage string          `json:"escalation_message,omitempty"`
	Thresholds        ThresholdCount  `json:"thresholds,omitempty"`
	IncludeTags       bool            `json:"include_tags,omitempty"`
	RequireFullWindow bool            `json:"require_full_window,omitempty"`
	Locked            bool            `json:"locked,omitempty"`
}

// Monitor allows watching a metric or check that you care about,
// notifying your team when some defined threshold is exceeded
type Monitor struct {
	Creator Creator  `json:"creator,omitempty"`
	Id      int      `json:"id,omitempty"`
	Type    string   `json:"type,omitempty"`
	Query   string   `json:"query,omitempty"`
	Name    string   `json:"name,omitempty"`
	Message string   `json:"message,omitempty"`
	Tags    []string `json:"tags,omitempty"`
	Options Options  `json:"options,omitempty"`
}

// Creator contains the creator of the monitor
type Creator struct {
	Email  string `json:"email,omitempty"`
	Handle string `json:"handle,omitempty"`
	Id     int    `json:"id,omitempty"`
	Name   string `json:"name,omitempty"`
}

// reqMonitors receives a slice of all monitors
type reqMonitors struct {
	Monitors []Monitor `json:"monitors,omitempty"`
}

// CreateMonitor adds a new monitor to the system. This returns a pointer to a
// monitor so you can pass that to UpdateMonitor later if needed
func (client *Client) CreateMonitor(monitor *Monitor) (*Monitor, error) {
	var out Monitor
	// TODO: is this more pretty of frowned upon?
	if err := client.doJsonRequest("POST", "/v1/monitor", monitor, &out); err != nil {
		return nil, err
	}
	return &out, nil
}

// UpdateMonitor takes a monitor that was previously retrieved through some method
// and sends it back to the server
func (client *Client) UpdateMonitor(monitor *Monitor) error {
	return client.doJsonRequest("PUT", fmt.Sprintf("/v1/monitor/%d", monitor.Id),
		monitor, nil)
}

// GetMonitor retrieves a monitor by identifier
func (client *Client) GetMonitor(id int) (*Monitor, error) {
	var out Monitor
	if err := client.doJsonRequest("GET", fmt.Sprintf("/v1/monitor/%d", id), nil, &out); err != nil {
		return nil, err
	}
	return &out, nil
}

// GetMonitor retrieves monitors by name
func (self *Client) GetMonitorsByName(name string) ([]Monitor, error) {
	var out reqMonitors
	query, err := url.ParseQuery(fmt.Sprintf("name=%v", name))
	if err != nil {
		return nil, err
	}

	err = self.doJsonRequest("GET", fmt.Sprintf("/v1/monitor?%v", query.Encode()), nil, &out.Monitors)
	if err != nil {
		return nil, err
	}
	return out.Monitors, nil
}

// GetMonitor retrieves monitors by a slice of tags
func (self *Client) GetMonitorsByTags(tags []string) ([]Monitor, error) {
	var out reqMonitors
	query, err := url.ParseQuery(fmt.Sprintf("monitor_tags=%v", strings.Join(tags, ",")))
	if err != nil {
		return nil, err
	}

	err = self.doJsonRequest("GET", fmt.Sprintf("/v1/monitor?%v", query.Encode()), nil, &out.Monitors)
	if err != nil {
		return nil, err
	}
	return out.Monitors, nil
}

// DeleteMonitor removes a monitor from the system
func (client *Client) DeleteMonitor(id int) error {
	return client.doJsonRequest("DELETE", fmt.Sprintf("/v1/monitor/%d", id),
		nil, nil)
}

// GetMonitors returns a slice of all monitors
func (client *Client) GetMonitors() ([]Monitor, error) {
	var out reqMonitors
	if err := client.doJsonRequest("GET", "/v1/monitor", nil, &out.Monitors); err != nil {
		return nil, err
	}
	return out.Monitors, nil
}

// MuteMonitors turns off monitoring notifications
func (client *Client) MuteMonitors() error {
	return client.doJsonRequest("POST", "/v1/monitor/mute_all", nil, nil)
}

// UnmuteMonitors turns on monitoring notifications
func (client *Client) UnmuteMonitors() error {
	return client.doJsonRequest("POST", "/v1/monitor/unmute_all", nil, nil)
}

// MuteMonitor turns off monitoring notifications for a monitor
func (client *Client) MuteMonitor(id int) error {
	return client.doJsonRequest("POST", fmt.Sprintf("/v1/monitor/%d/mute", id), nil, nil)
}

// UnmuteMonitor turns on monitoring notifications for a monitor
func (client *Client) UnmuteMonitor(id int) error {
	return client.doJsonRequest("POST", fmt.Sprintf("/v1/monitor/%d/unmute", id), nil, nil)
}