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 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()

	var payload SentryPayload
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		p.API.LogError("Failed to decode Sentry 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
	}

	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 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)
}