package web

import (
	"ResendIt/internal/file"
	"os"
	"strconv"

	"github.com/gin-gonic/gin"
)

type Handler struct {
	fileService   *file.Service
	configService ConfigService
}

// ConfigService is the small interface needed by the web layer.
type ConfigService interface {
	GetIntDefault(key string, def int) int
	GetInt64Default(key string, def int64) int64
	SetString(key, value string) error
}

func NewHandler(fileService *file.Service, cfg ConfigService) *Handler {
	return &Handler{
		fileService:   fileService,
		configService: cfg,
	}
}

// Homepage
func (h *Handler) Index(c *gin.Context) {
	c.HTML(200, "index.html", gin.H{
		"title": "Home",
	})
}

// Upload page
func (h *Handler) UploadPage(c *gin.Context) {
	c.HTML(200, "upload.html", nil)
}

func (h *Handler) LoginPage(c *gin.Context) {
	c.HTML(200, "login.html", nil)
}

func (h *Handler) FileView(c *gin.Context) {
	id := c.Param("id")

	fileRecord, err := h.fileService.GetFileByViewID(id)
	if err != nil {
		c.HTML(404, "fileNotFound.html", nil)
		return
	}

	downloadKey := fileRecord.ID
	deleteKey := fileRecord.DeletionID

	c.HTML(200, "complete.html", gin.H{
		"Filename":   fileRecord.Filename,
		"DownloadID": downloadKey,
		"DeleteID":   deleteKey,
	})
}

func (h *Handler) AdminPage(c *gin.Context) {
	pageStr := c.Query("page")
	page, err := strconv.Atoi(pageStr)
	if err != nil || page < 1 {
		page = 1
	}

	limit := 10
	offset := (page - 1) * limit

	files, totalCount, err := h.fileService.GetPaginatedFiles(limit, offset)
	if err != nil {
		c.HTML(500, "admin.html", gin.H{
			"error": err.Error(),
		})
		return
	}

	// Only check files on the current page.
	// Status meanings:
	// - green: file exists on disk
	// - red: file missing
	// - rainbow: stat error (something unexpected)
	type AdminFileView struct {
		file.FileRecord
		ActualStatus string
	}

	adminFiles := make([]AdminFileView, 0, len(files))
	for _, f := range files {
		status := "red"
		if f.Path != "" {
			if _, err := os.Stat(f.Path); err == nil {
				status = "green"
			} else if os.IsNotExist(err) {
				status = "red"
			} else {
				status = "rainbow"
			}
		}
		adminFiles = append(adminFiles, AdminFileView{FileRecord: f, ActualStatus: status})
	}

	totalPages := (totalCount + limit - 1) / limit

	c.HTML(200, "admin.html", gin.H{
		"Files":      adminFiles,
		"Page":       page,
		"TotalPages": totalPages,
	})
}

func (h *Handler) Logout(c *gin.Context) {
	c.SetCookie("auth_token", "", -1, "/", "", false, true)
	c.Redirect(302, "/")
}

func (h *Handler) ChangePasswordPage(c *gin.Context) {
	c.HTML(200, "changePassword.html", nil)
}