package public

import (
	"net/http"

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

type TicketHandler struct {
	deps Dependencies
}

func (h *TicketHandler) List(c *gin.Context) {
	user := auth.CurrentUser(c)

	var tickets []models.Ticket
	if err := h.deps.DB.Preload("Repo").Where("user_id = ?", user.ID).Order("created_at DESC").Limit(50).Find(&tickets).Error; err != nil {
		log.Error().Err(err).Msg("list tickets error")
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusInternalServerError, "Failed to load tickets")
		return
	}

	if len(tickets) == 0 {
		h.deps.Renderer.Render(c.Writer, c.Request, "tickets/list", map[string]interface{}{
			"Tickets": []map[string]interface{}{},
		})
		return
	}

	// Group tickets by repo
	type repoGroup struct {
		repo    models.Repo
		tickets []models.Ticket
	}
	repoMap := map[uuid.UUID]*repoGroup{}
	for _, t := range tickets {
		if _, ok := repoMap[t.RepoID]; !ok {
			repoMap[t.RepoID] = &repoGroup{repo: t.Repo}
		}
		repoMap[t.RepoID].tickets = append(repoMap[t.RepoID].tickets, t)
	}

	// Fetch issues from Forgejo per repo and build view models
	type ticketView struct {
		ID        uuid.UUID
		Title     string
		Status    string
		RepoName  string
		CreatedAt interface{}
	}
	var views []ticketView

	for _, group := range repoMap {
		issues, err := h.deps.ForgejoClient.ListIssues(group.repo.ForgejoOwner, group.repo.ForgejoRepo, "all", "")
		if err != nil {
			log.Error().Err(err).Str("repo", group.repo.Name).Msg("forgejo list issues error")
			// Show tickets with unknown status on API failure
			for _, t := range group.tickets {
				views = append(views, ticketView{
					ID:        t.ID,
					Title:     "Unable to load",
					Status:    "open",
					RepoName:  group.repo.Name,
					CreatedAt: t.CreatedAt,
				})
			}
			continue
		}

		issueByNumber := map[int64]*forgejo.Issue{}
		for i := range issues {
			issueByNumber[issues[i].Number] = &issues[i]
		}

		for _, t := range group.tickets {
			if issue, ok := issueByNumber[t.ForgejoIssueNumber]; ok {
				views = append(views, ticketView{
					ID:        t.ID,
					Title:     issue.Title,
					Status:    forgejo.DeriveStatus(issue),
					RepoName:  group.repo.Name,
					CreatedAt: t.CreatedAt,
				})
			}
		}
	}

	h.deps.Renderer.Render(c.Writer, c.Request, "tickets/list", map[string]interface{}{
		"Tickets": views,
	})
}

func (h *TicketHandler) NewForm(c *gin.Context) {
	user := auth.CurrentUser(c)

	var repos []models.Repo
	if err := h.deps.DB.
		Joins("JOIN user_repos ON user_repos.repo_id = repos.id").
		Where("user_repos.user_id = ? AND repos.active = ?", user.ID, true).
		Order("repos.name ASC").
		Find(&repos).Error; err != nil {
		log.Error().Err(err).Msg("list repos error")
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusInternalServerError, "Failed to load products")
		return
	}

	h.deps.Renderer.Render(c.Writer, c.Request, "tickets/new", map[string]interface{}{
		"Repos": repos,
	})
}

func (h *TicketHandler) Create(c *gin.Context) {
	user := auth.CurrentUser(c)

	repoID, err := uuid.Parse(c.PostForm("repo_id"))
	if err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusBadRequest, "Invalid product selection")
		return
	}

	// Validate the user has access to this repo
	var userRepo models.UserRepo
	if err := h.deps.DB.Where("user_id = ? AND repo_id = ?", user.ID, repoID).First(&userRepo).Error; err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusForbidden, "You do not have access to this project")
		return
	}

	title := c.PostForm("title")
	description := c.PostForm("description")

	if title == "" || description == "" {
		var repos []models.Repo
		h.deps.DB.
			Joins("JOIN user_repos ON user_repos.repo_id = repos.id").
			Where("user_repos.user_id = ? AND repos.active = ?", user.ID, true).
			Order("repos.name ASC").
			Find(&repos)
		h.deps.Renderer.Render(c.Writer, c.Request, "tickets/new", map[string]interface{}{
			"Repos":       repos,
			"Error":       "Title and description are required",
			"Title":       title,
			"Description": description,
			"RepoID":      repoID.String(),
		})
		return
	}

	// Look up the repo
	var repo models.Repo
	if err := h.deps.DB.First(&repo, "id = ?", repoID).Error; err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusInternalServerError, "Failed to find product")
		return
	}

	// Synchronous Forgejo issue creation
	var labelIDs []int64
	label, err := h.deps.ForgejoClient.GetLabel(repo.ForgejoOwner, repo.ForgejoRepo, "customer")
	if err != nil {
		log.Error().Err(err).Msg("forgejo get/create label error")
	} else {
		labelIDs = append(labelIDs, label.ID)
	}

	issue, err := h.deps.ForgejoClient.CreateIssue(repo.ForgejoOwner, repo.ForgejoRepo, forgejo.CreateIssueRequest{
		Title:  title,
		Body:   description + "\n\n---\n*Submitted by: " + user.Email + "*",
		Labels: labelIDs,
	})
	if err != nil {
		log.Error().Err(err).Msg("forgejo create issue error")
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusServiceUnavailable, "Service temporarily unavailable. Please try again later.")
		return
	}

	// Create local ticket mapping
	ticket := models.Ticket{
		UserID:             user.ID,
		RepoID:             repoID,
		ForgejoIssueNumber: issue.Number,
	}

	if err := h.deps.DB.Create(&ticket).Error; err != nil {
		log.Error().Err(err).Msg("create ticket error")
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusInternalServerError, "Failed to create ticket")
		return
	}

	c.Redirect(http.StatusSeeOther, "/tickets/"+ticket.ID.String())
}

func (h *TicketHandler) Detail(c *gin.Context) {
	user := auth.CurrentUser(c)

	ticketID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusBadRequest, "Invalid ticket ID")
		return
	}

	var ticket models.Ticket
	if err := h.deps.DB.First(&ticket, "id = ?", ticketID).Error; err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusNotFound, "Ticket not found")
		return
	}

	if ticket.UserID != user.ID {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusForbidden, "Access denied")
		return
	}

	var repo models.Repo
	h.deps.DB.First(&repo, "id = ?", ticket.RepoID)

	// Fetch issue and comments from Forgejo
	issue, err := h.deps.ForgejoClient.GetIssue(repo.ForgejoOwner, repo.ForgejoRepo, ticket.ForgejoIssueNumber)
	if err != nil {
		log.Error().Err(err).Msg("forgejo get issue error")
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusServiceUnavailable, "Unable to load ticket details. Please try again later.")
		return
	}

	rawComments, err := h.deps.ForgejoClient.ListIssueComments(repo.ForgejoOwner, repo.ForgejoRepo, ticket.ForgejoIssueNumber)
	if err != nil {
		log.Error().Err(err).Msg("forgejo list comments error")
		rawComments = nil // Show ticket without comments on error
	}

	// Strip the "Submitted by" footer from the issue body
	cleanBody, _ := forgejo.StripCommentFooter(issue.Body)

	comments := forgejo.BuildCommentViews(rawComments, h.deps.ForgejoClient.BotLogin)

	h.deps.Renderer.Render(c.Writer, c.Request, "tickets/detail", map[string]interface{}{
		"Ticket": map[string]interface{}{
			"ID":          ticket.ID,
			"Title":       issue.Title,
			"Description": cleanBody,
			"Status":      forgejo.DeriveStatus(issue),
			"CreatedAt":   ticket.CreatedAt,
		},
		"Repo":     repo,
		"Comments": comments,
	})
}

func (h *TicketHandler) AddComment(c *gin.Context) {
	user := auth.CurrentUser(c)

	ticketID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusBadRequest, "Invalid ticket ID")
		return
	}

	var ticket models.Ticket
	if err := h.deps.DB.First(&ticket, "id = ?", ticketID).Error; err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusNotFound, "Ticket not found")
		return
	}

	if ticket.UserID != user.ID {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusForbidden, "Access denied")
		return
	}

	body := c.PostForm("body")
	if body == "" {
		c.Redirect(http.StatusSeeOther, "/tickets/"+ticket.ID.String())
		return
	}

	// Post comment directly to Forgejo
	var repo models.Repo
	if err := h.deps.DB.First(&repo, "id = ?", ticket.RepoID).Error; err != nil {
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusInternalServerError, "Failed to find product")
		return
	}

	_, err = h.deps.ForgejoClient.CreateComment(repo.ForgejoOwner, repo.ForgejoRepo, ticket.ForgejoIssueNumber, forgejo.CreateCommentRequest{
		Body: body + "\n\n---\n*Customer comment by: " + user.Email + "*",
	})
	if err != nil {
		log.Error().Err(err).Msg("forgejo create comment error")
		h.deps.Renderer.RenderError(c.Writer, c.Request, http.StatusServiceUnavailable, "Unable to add comment. Please try again later.")
		return
	}

	c.Redirect(http.StatusSeeOther, "/tickets/"+ticket.ID.String())
}