package tasks

import (
	"bytes"
	"embed"
	"fmt"
	"net/http"
	"strconv"
	"text/template"

	"github.com/ansible-semaphore/semaphore/lib"
	"github.com/ansible-semaphore/semaphore/util"
	"github.com/ansible-semaphore/semaphore/util/mailer"
)

//go:embed templates/*.tmpl
var templates embed.FS

// Alert represents an alert that will be templated and sent to the appropriate service
type Alert struct {
	Name   string
	Author string
	Color  string
	Task   alertTask
	Chat   alertChat
}

type alertTask struct {
	ID      string
	URL     string
	Result  string
	Desc    string
	Version string
}

type alertChat struct {
	ID string
}

func (t *TaskRunner) sendMailAlert() {
	if !util.Config.EmailAlert || !t.alert {
		return
	}

	body := bytes.NewBufferString("")
	author, version := t.alertInfos()

	alert := Alert{
		Name:   t.Template.Name,
		Author: author,
		Color:  t.alertColor("email"),
		Task: alertTask{
			ID:      strconv.Itoa(t.Task.ID),
			URL:     t.taskLink(),
			Result:  t.Task.Status.Format(),
			Version: version,
			Desc:    t.Task.Message,
		},
	}

	tpl, err := template.ParseFS(templates, "templates/email.tmpl")

	if err != nil {
		t.Log("Can't parse email alert template!")
		panic(err)
	}

	if err := tpl.Execute(body, alert); err != nil {
		t.Log("Can't generate email alert template!")
		panic(err)
	}

	if body.Len() == 0 {
		t.Log("Buffer for email alert is empty")
		return
	}

	for _, uid := range t.users {
		user, err := t.pool.store.GetUser(uid)

		if !user.Alert {
			continue
		}

		if err != nil {
			util.LogError(err)
			continue
		}

		t.Logf("Attempting to send email alert to %s", user.Email)

		if err := mailer.Send(
			util.Config.EmailSecure,
			util.Config.EmailHost,
			util.Config.EmailPort,
			util.Config.EmailUsername,
			util.Config.EmailPassword,
			util.Config.EmailSender,
			user.Email,
			fmt.Sprintf("Task '%s' failed", t.Template.Name),
			body.String(),
		); err != nil {
			util.LogError(err)
			continue
		}

		t.Logf("Sent successfully email alert to %s", user.Email)
	}
}

func (t *TaskRunner) sendTelegramAlert() {
	if !util.Config.TelegramAlert || !t.alert {
		return
	}

	if t.Template.SuppressSuccessAlerts && t.Task.Status == lib.TaskSuccessStatus {
		return
	}

	chatID := util.Config.TelegramChat
	if t.alertChat != nil && *t.alertChat != "" {
		chatID = *t.alertChat
	}

	if chatID == "" {
		return
	}

	body := bytes.NewBufferString("")
	author, version := t.alertInfos()

	alert := Alert{
		Name:   t.Template.Name,
		Author: author,
		Color:  t.alertColor("telegram"),
		Task: alertTask{
			ID:      strconv.Itoa(t.Task.ID),
			URL:     t.taskLink(),
			Result:  t.Task.Status.Format(),
			Version: version,
			Desc:    t.Task.Message,
		},
		Chat: alertChat{
			ID: chatID,
		},
	}

	tpl, err := template.ParseFS(templates, "templates/telegram.tmpl")

	if err != nil {
		t.Log("Can't parse telegram alert template!")
		panic(err)
	}

	if err := tpl.Execute(body, alert); err != nil {
		t.Log("Can't generate telegram alert template!")
		panic(err)
	}

	if body.Len() == 0 {
		t.Log("Buffer for telegram alert is empty")
		return
	}

	t.Log("Attempting to send telegram alert")

	resp, err := http.Post(
		fmt.Sprintf(
			"https://api.telegram.org/bot%s/sendMessage",
			util.Config.TelegramToken,
		),
		"application/json",
		body,
	)

	if err != nil {
		t.Log("Can't send telegram alert! Error: " + err.Error())
	} else if resp.StatusCode != 200 {
		t.Log("Can't send telegram alert! Response code: " + strconv.Itoa(resp.StatusCode))
	}

	t.Log("Sent successfully telegram alert")
}

func (t *TaskRunner) sendSlackAlert() {
	if !util.Config.SlackAlert || !t.alert {
		return
	}

	if t.Template.SuppressSuccessAlerts && t.Task.Status == lib.TaskSuccessStatus {
		return
	}

	body := bytes.NewBufferString("")
	author, version := t.alertInfos()

	alert := Alert{
		Name:   t.Template.Name,
		Author: author,
		Color:  t.alertColor("slack"),
		Task: alertTask{
			ID:      strconv.Itoa(t.Task.ID),
			URL:     t.taskLink(),
			Result:  t.Task.Status.Format(),
			Version: version,
			Desc:    t.Task.Message,
		},
	}

	tpl, err := template.ParseFS(templates, "templates/slack.tmpl")

	if err != nil {
		t.Log("Can't parse slack alert template!")
		panic(err)
	}

	if err := tpl.Execute(body, alert); err != nil {
		t.Log("Can't generate slack alert template!")
		panic(err)
	}

	if body.Len() == 0 {
		t.Log("Buffer for slack alert is empty")
		return
	}

	t.Log("Attempting to send slack alert")

	resp, err := http.Post(
		util.Config.SlackUrl,
		"application/json",
		body,
	)

	if err != nil {
		t.Log("Can't send slack alert! Error: " + err.Error())
	} else if resp.StatusCode != 200 {
		t.Log("Can't send slack alert! Response code: " + strconv.Itoa(resp.StatusCode))
	} else {
		t.Log("Sent successfully slack alert")
	}
}

func (t *TaskRunner) sendRocketChatAlert() {
	if !util.Config.RocketChatAlert || !t.alert {
		return
	}

	if t.Template.SuppressSuccessAlerts && t.Task.Status == lib.TaskSuccessStatus {
		return
	}

	body := bytes.NewBufferString("")
	author, version := t.alertInfos()

	alert := Alert{
		Name:   t.Template.Name,
		Author: author,
		Color:  t.alertColor("rocketchat"),
		Task: alertTask{
			ID:      strconv.Itoa(t.Task.ID),
			URL:     t.taskLink(),
			Result:  t.Task.Status.Format(),
			Version: version,
			Desc:    t.Task.Message,
		},
	}

	tpl, err := template.ParseFS(templates, "templates/rocketchat.tmpl")

	if err != nil {
		t.Log("Can't parse rocketchat alert template!")
		panic(err)
	}

	if err := tpl.Execute(body, alert); err != nil {
		t.Log("Can't generate rocketchat alert template!")
		panic(err)
	}

	if body.Len() == 0 {
		t.Log("Buffer for rocketchat alert is empty")
		return
	}

	t.Log("Attempting to send rocketchat alert")

	resp, err := http.Post(
		util.Config.RocketChatUrl,
		"application/json",
		body,
	)

	if err != nil {
		t.Log("Can't send rocketchat alert! Error: " + err.Error())
	} else if resp.StatusCode != 200 {
		t.Log("Can't send rocketchat alert! Response code: " + strconv.Itoa(resp.StatusCode))
	}

	t.Log("Sent successfully rocketchat alert")
}

func (t *TaskRunner) sendMicrosoftTeamsAlert() {
	if !util.Config.MicrosoftTeamsAlert || !t.alert {
		return
	}

	if t.Template.SuppressSuccessAlerts && t.Task.Status == lib.TaskSuccessStatus {
		return
	}

	body := bytes.NewBufferString("")
	author, version := t.alertInfos()

	alert := Alert{
		Name:   t.Template.Name,
		Author: author,
		Color:  t.alertColor("micorsoft-teams"),
		Task: alertTask{
			ID:      strconv.Itoa(t.Task.ID),
			URL:     t.taskLink(),
			Result:  t.Task.Status.Format(),
			Version: version,
			Desc:    t.Task.Message,
		},
	}

	tpl, err := template.ParseFS(templates, "templates/microsoft-teams.tmpl")

	if err != nil {
		t.Log("Can't parse microsoft teams alert template!")
		panic(err)
	}

	if err := tpl.Execute(body, alert); err != nil {
		t.Log("Can't generate microsoft teams alert template!")
		panic(err)
	}

	if body.Len() == 0 {
		t.Log("Buffer for microsoft teams alert is empty")
		return
	}

	t.Log("Attempting to send microsoft teams alert")

	resp, err := http.Post(
		util.Config.MicrosoftTeamsUrl,
		"application/json",
		body,
	)

	if err != nil {
		t.Log("Can't send microsoft teams alert! Error: " + err.Error())
	} else if resp.StatusCode != 200 {
		t.Log("Can't send microsoft teams alert! Response code: " + strconv.Itoa(resp.StatusCode))
	}

	t.Log("Sent successfully microsoft teams alert")
}

func (t *TaskRunner) alertInfos() (string, string) {
	version := ""

	if t.Task.Version != nil {
		version = *t.Task.Version
	} else if t.Task.BuildTaskID != nil {
		version = "build " + strconv.Itoa(*t.Task.BuildTaskID)
	} else {
		version = ""
	}

	author := "—"

	if t.Task.UserID != nil {
		user, err := t.pool.store.GetUser(*t.Task.UserID)

		if err != nil {
			panic(err)
		}

		author = user.Name
	}

	return version, author
}

func (t *TaskRunner) alertColor(kind string) string {
	switch kind {
	case "slack":
		switch t.Task.Status {
		case lib.TaskSuccessStatus:
			return "good"
		case lib.TaskFailStatus:
			return "danger"
		case lib.TaskRunningStatus:
			return "#333CFF"
		case lib.TaskWaitingStatus:
			return "#FFFC33"
		case lib.TaskStoppingStatus:
			return "#BEBEBE"
		case lib.TaskStoppedStatus:
			return "#5B5B5B"
		}
	case "rocketchat":
		switch t.Task.Status {
		case lib.TaskSuccessStatus:
			return "#00EE00"
		case lib.TaskFailStatus:
			return "#EE0000"
		case lib.TaskRunningStatus:
			return "#333CFF"
		case lib.TaskWaitingStatus:
			return "#FFFC33"
		case lib.TaskStoppingStatus:
			return "#BEBEBE"
		case lib.TaskStoppedStatus:
			return "#5B5B5B"
		}
	}

	return ""
}

func (t *TaskRunner) taskLink() string {
	return fmt.Sprintf(
		"%s/project/%d/templates/%d?t=%d",
		util.Config.WebHost,
		t.Template.ProjectID,
		t.Template.ID,
		t.Task.ID,
	)
}