package public

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/mattnite/forgejo-tickets/internal/forgejo"
	"github.com/mattnite/forgejo-tickets/internal/models"
	"github.com/rs/zerolog/log"
)

type WebhookHandler struct {
	deps Dependencies
}

func (h *WebhookHandler) HandleForgejoWebhook(c *gin.Context) {
	repoSlug := c.Param("repoSlug")

	var repo models.Repo
	if err := h.deps.DB.Where("slug = ?", repoSlug).First(&repo).Error; err != nil {
		log.Error().Msgf("webhook: unknown repo slug %q", repoSlug)
		c.String(http.StatusNotFound, "Unknown repo")
		return
	}

	body, err := forgejo.VerifyWebhookSignature(c.Request, repo.WebhookSecret)
	if err != nil {
		log.Error().Err(err).Msgf("webhook: signature verification failed for %q", repoSlug)
		c.String(http.StatusUnauthorized, "Invalid signature")
		return
	}

	if !repo.WebhookVerified {
		now := time.Now()
		h.deps.DB.Model(&repo).Updates(map[string]interface{}{
			"webhook_verified":    true,
			"webhook_verified_at": now,
		})
		log.Info().Msgf("webhook: marked repo %q as verified", repoSlug)
	}

	payload, err := forgejo.ParseWebhookPayload(body)
	if err != nil {
		log.Error().Err(err).Msg("webhook: parse error")
		c.String(http.StatusBadRequest, "Invalid payload")
		return
	}

	// Determine event type from header
	eventType := c.GetHeader("X-Forgejo-Event")

	switch eventType {
	case "issues":
		h.handleIssueEvent(c, &repo, payload)
	case "issue_comment":
		h.handleCommentEvent(c, &repo, payload)
	default:
		// For unrecognized events or legacy (no header), try issue events
		if payload.Action == "closed" || payload.Action == "reopened" {
			h.handleIssueEvent(c, &repo, payload)
		} else {
			c.Status(http.StatusOK)
		}
	}
}

func (h *WebhookHandler) handleIssueEvent(c *gin.Context, repo *models.Repo, payload *forgejo.WebhookPayload) {
	if payload.Action != "closed" {
		c.Status(http.StatusOK)
		return
	}

	var ticket models.Ticket
	if err := h.deps.DB.Where("repo_id = ? AND forgejo_issue_number = ?", repo.ID, payload.Issue.Number).First(&ticket).Error; err != nil {
		log.Info().Msgf("webhook: no ticket found for repo %s issue #%d", repo.Slug, payload.Issue.Number)
		c.Status(http.StatusOK)
		return
	}

	// Send email notification to ticket owner
	var user models.User
	if err := h.deps.DB.First(&user, "id = ?", ticket.UserID).Error; err == nil {
		go func() {
			if err := h.deps.EmailClient.SendTicketClosedNotification(
				user.Email, user.Name, payload.Issue.Title, ticket.ID.String(),
			); err != nil {
				log.Error().Err(err).Msg("webhook: send notification error")
			}
		}()
	}

	c.Status(http.StatusOK)
}

func (h *WebhookHandler) handleCommentEvent(c *gin.Context, repo *models.Repo, payload *forgejo.WebhookPayload) {
	if payload.Action != "created" {
		c.Status(http.StatusOK)
		return
	}

	// Skip comments posted by the bot (customer comments)
	if payload.Comment.User.Login == h.deps.ForgejoClient.BotLogin {
		c.Status(http.StatusOK)
		return
	}

	// This is a team reply — find the ticket and notify the customer
	var ticket models.Ticket
	if err := h.deps.DB.Where("repo_id = ? AND forgejo_issue_number = ?", repo.ID, payload.Issue.Number).First(&ticket).Error; err != nil {
		log.Info().Msgf("webhook: no ticket found for repo %s issue #%d", repo.Slug, payload.Issue.Number)
		c.Status(http.StatusOK)
		return
	}

	var user models.User
	if err := h.deps.DB.First(&user, "id = ?", ticket.UserID).Error; err == nil {
		go func() {
			if err := h.deps.EmailClient.SendTicketReplyNotification(
				user.Email, user.Name, payload.Issue.Title, ticket.ID.String(),
			); err != nil {
				log.Error().Err(err).Msg("webhook: send reply notification error")
			}
		}()
	}

	c.Status(http.StatusOK)
}