package plugin

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/mattermost/mattermost/server/public/model"
)

func levelToColor(level string) string {
	switch strings.ToLower(level) {
	case "fatal":
		return "#B10DC9" // фиолетовый, критический
	case "error":
		return "#FF4136" // красный
	case "warning":
		return "#FF851B" // оранжевый
	case "log":
		return "#AAAAAA" // серый
	case "info":
		return "#0074D9" // синий
	case "debug":
		return "#2ECC40" // зелёный
	default:
		return "#AAAAAA" // серый для неизвестных
	}
}

func getTagFromArray(tags [][]string, key string) string {
	for _, t := range tags {
		if len(t) == 2 && t[0] == key {
			return t[1]
		}
	}
	return ""
}

func (p *Plugin) getProject(projectID string) (*LinkedProject, error) {
	key := "ru.loop.plugin.sentry:project:" + projectID

	data, appErr := p.API.KVGet(key)
	if appErr != nil || data == nil {
		return nil, appErr
	}

	var project LinkedProject
	if err := json.Unmarshal(data, &project); err != nil {
		return nil, err
	}

	return &project, nil
}

func formatStacktrace(ex *SentryExceptionValue) string {
	if ex == nil || len(ex.Stacktrace.Frames) == 0 {
		return ""
	}

	lines := make([]string, 0, len(ex.Stacktrace.Frames))
	for _, f := range ex.Stacktrace.Frames {
		lines = append(lines, fmt.Sprintf("%s:%d %s - %s", f.Filename, f.Lineno, f.Function, f.ContextLine))
	}
	return strings.Join(lines, "\n")
}

func (p *Plugin) handleWebhook(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()

	resource := r.Header.Get("Sentry-Hook-Resource")

	switch resource {
	case "event_alert":
		p.handleEventAlert(w, r)
	case "comment":
		p.handleComment(w, r)
	case "metric_alert":
		p.handleMetricAlert(w, r)
	case "issue":
		p.handleIssue(w, r)
	default:
		p.API.LogWarn("Unsupported Sentry hook resource", "resource", resource)
		w.WriteHeader(http.StatusOK)
	}
}

func (p *Plugin) handleEventAlert(w http.ResponseWriter, r *http.Request) {
	var payload SentryPayload
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		p.API.LogError("Failed to decode Sentry event alert payload", "error", err.Error())
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	event := payload.Data.Event

	channelID, err := p.getChannelForProject(strconv.Itoa(event.Project))
	if err != nil || channelID == "" {
		p.API.LogWarn("No channel linked for project", "project", event.Project)
		w.WriteHeader(http.StatusOK)
		return
	}

	project, err := p.getProject(strconv.Itoa(event.Project))
	if err != nil || project == nil || project.ChannelID == "" {
		p.API.LogWarn("No channel linked for project", "project", event.Project)
		w.WriteHeader(http.StatusOK)
		return
	}

	environment := getTagFromArray(event.Tags, "environment")
	release := getTagFromArray(event.Tags, "release")
	user := getTagFromArray(event.Tags, "user")

	attachment := &model.SlackAttachment{
		Color:     levelToColor(event.Level),
		Title:     event.Title,
		TitleLink: event.WebURL,
		Text:      event.Message,
		Fields: []*model.SlackAttachmentField{
			{
				Title: "Project",
				Value: fmt.Sprintf("%s (`%s`)", project.Name, project.Slug),
				Short: true,
			},
			{Title: "Project ID", Value: strconv.Itoa(event.Project), Short: true},
			{Title: "Issue ID", Value: event.IssueID, Short: true},
			{Title: "Environment", Value: environment, Short: true},
			{Title: "Level", Value: event.Level, Short: true},
			{Title: "Culprit", Value: event.Culprit, Short: false},
			{Title: "Logger", Value: event.Logger, Short: true},
			{Title: "Platform", Value: event.Platform, Short: true},
			{Title: "Release", Value: release, Short: true},
			{Title: "User", Value: user, Short: true},
		},
	}

	if event.Exception != nil && len(event.Exception.Values) > 0 {
		for _, ex := range event.Exception.Values {
			attachment.Fields = append(attachment.Fields, &model.SlackAttachmentField{
				Title: "Exception",
				Value: fmt.Sprintf(
					"Type: %s\nValue: %s\nStacktrace:\n%s",
					ex.Type,
					ex.Value,
					formatStacktrace(&ex),
				),
				Short: true,
			})
		}
	}

	for _, tag := range event.Tags {
		if len(tag) != 2 {
			continue
		}

		key := tag[0]
		value := tag[1]

		if key == "environment" || key == "release" || key == "user" {
			continue
		}

		attachment.Fields = append(attachment.Fields, &model.SlackAttachmentField{
			Title: key,
			Value: value,
			Short: true,
		})
	}

	post := &model.Post{
		UserId:    p.botUserID,
		ChannelId: channelID,
		Props: map[string]interface{}{
			"attachments": []*model.SlackAttachment{attachment},
		},
	}

	if _, err := p.API.CreatePost(post); err != nil {
		p.API.LogError("Failed to create post", "error", err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}

func (p *Plugin) handleComment(w http.ResponseWriter, r *http.Request) {
	var payload SentryCommentPayload
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		p.API.LogError("Failed to decode Sentry comment payload", "error", err.Error())
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	project, err := p.getProjectBySlug(payload.Data.ProjectSlug)
	if err != nil || project == nil || project.ChannelID == "" {
		p.API.LogWarn("No channel linked for project", "slug", payload.Data.ProjectSlug)
		w.WriteHeader(http.StatusOK)
		return
	}

	attachment := &model.SlackAttachment{
		Color: "#439FE0",
		Title: "💬 New Sentry comment",
		Text: fmt.Sprintf(
			"*%s* commented on issue `%d`\n\n>%s",
			payload.Actor.Name,
			payload.Data.IssueID,
			payload.Data.Comment,
		),
		Fields: []*model.SlackAttachmentField{
			{Title: "Project", Value: project.Name, Short: true},
			{Title: "Action", Value: payload.Action, Short: true},
			{Title: "Comment ID", Value: strconv.Itoa(payload.Data.CommentID), Short: true},
		},
	}

	post := &model.Post{
		UserId:    p.botUserID,
		ChannelId: project.ChannelID,
		Props: map[string]interface{}{
			"attachments": []*model.SlackAttachment{attachment},
		},
	}

	if _, err := p.API.CreatePost(post); err != nil {
		p.API.LogError("Failed to create comment post", "error", err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}

func (p *Plugin) getProjectBySlug(slug string) (*LinkedProject, error) {
	// Получаем все ключи плагина
	keys, appErr := p.API.KVList(0, 1000)
	if appErr != nil {
		return nil, appErr
	}

	for _, key := range keys {
		// интересуют только наши проекты
		if !strings.HasPrefix(key, "ru.loop.plugin.sentry:project:") {
			continue
		}

		data, appErr := p.API.KVGet(key)
		if appErr != nil || data == nil {
			continue
		}

		var project LinkedProject
		if err := json.Unmarshal(data, &project); err != nil {
			continue
		}

		if project.Slug == slug {
			return &project, nil
		}
	}

	return nil, nil
}

func (p *Plugin) handleMetricAlert(w http.ResponseWriter, r *http.Request) {
	var payload SentryMetricAlertPayload
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		p.API.LogError("Failed to decode metric alert payload", "error", err.Error())
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	alert := payload.Data.MetricAlert
	rule := alert.AlertRule

	// Обычно metric alerts привязаны к проекту по slug
	var project *LinkedProject
	if len(alert.Projects) > 0 {
		project, _ = p.getProjectBySlug(alert.Projects[0])
	}

	channelID := ""
	if project != nil {
		channelID = project.ChannelID
	}

	if channelID == "" {
		p.API.LogWarn("No channel linked for metric alert", "projects", alert.Projects)
		w.WriteHeader(http.StatusOK)
		return
	}

	color := "#E01E5A" // default: critical
	switch payload.Action {
	case "resolved":
		color = "#2EB67D"
	case "warning":
		color = "#ECB22E"
	}

	attachment := &model.SlackAttachment{
		Color:     color,
		Title:     payload.Data.DescriptionTitle,
		TitleLink: payload.Data.WebURL,
		Text:      payload.Data.DescriptionText,
		Fields: []*model.SlackAttachmentField{
			{
				Title: "Rule",
				Value: rule.Name,
				Short: true,
			},
			{
				Title: "Aggregate",
				Value: rule.Aggregate,
				Short: true,
			},
			{
				Title: "Query",
				Value: rule.Query,
				Short: false,
			},
			{
				Title: "Window (min)",
				Value: strconv.Itoa(rule.TimeWindow),
				Short: true,
			},
			{
				Title: "Action",
				Value: payload.Action,
				Short: true,
			},
		},
	}

	post := &model.Post{
		UserId:    p.botUserID,
		ChannelId: channelID,
		Props: map[string]interface{}{
			"attachments": []*model.SlackAttachment{attachment},
		},
	}

	if _, err := p.API.CreatePost(post); err != nil {
		p.API.LogError("Failed to create metric alert post", "error", err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}

func (p *Plugin) handleIssue(w http.ResponseWriter, r *http.Request) {
	var payload SentryIssuePayload
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		p.API.LogError("Failed to decode issue payload", "error", err.Error())
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	issue := payload.Data.Issue

	project, err := p.getProjectBySlug(issue.Project.Slug)
	if err != nil || project == nil || project.ChannelID == "" {
		p.API.LogWarn("No channel linked for issue", "project", issue.Project.Slug)
		w.WriteHeader(http.StatusOK)
		return
	}

	color := "#E01E5A" // default: red
	switch payload.Action {
	case "resolved":
		color = "#2EB67D"
	case "archived":
		color = "#6B7280"
	case "unresolved":
		color = "#F97316"
	}

	attachment := &model.SlackAttachment{
		Color:     color,
		Title:     fmt.Sprintf("[%s] %s", issue.ShortID, issue.Title),
		TitleLink: issue.WebURL,
		Text: fmt.Sprintf(
			"**Action:** `%s`\n**Status:** `%s`\n**Level:** `%s`\n**Priority:** `%s`",
			payload.Action,
			issue.Status,
			issue.Level,
			issue.Priority,
		),
		Fields: []*model.SlackAttachmentField{
			{Title: "Project", Value: issue.Project.Name, Short: true},
			{Title: "Platform", Value: issue.Platform, Short: true},
			{Title: "Type", Value: issue.IssueType, Short: true},
			{Title: "Category", Value: issue.IssueCategory, Short: true},
			{Title: "Events", Value: issue.Count, Short: true},
			{Title: "Users", Value: strconv.Itoa(issue.UserCount), Short: true},
		},
	}

	post := &model.Post{
		UserId:    p.botUserID,
		ChannelId: project.ChannelID,
		Props: map[string]interface{}{
			"attachments": []*model.SlackAttachment{attachment},
		},
	}

	if _, err := p.API.CreatePost(post); err != nil {
		p.API.LogError("Failed to create issue post", "error", err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}