package server

import (
	"archive/zip"
	"fmt"
	"io"
	"net/http"
	"os"

	"github.com/gin-gonic/gin"

	"warpbox/lib/boxstore"
	"warpbox/lib/helpers"
	"warpbox/lib/models"
)

func handleIndex(ctx *gin.Context) {
	ctx.HTML(http.StatusOK, "index.html", gin.H{})
}

func handleShowBox(ctx *gin.Context) {
	boxID := ctx.Param("id")
	if !boxstore.ValidBoxID(boxID) {
		ctx.String(http.StatusBadRequest, "Invalid box id")
		return
	}

	files, err := boxstore.ListFiles(boxID)
	if err != nil {
		ctx.String(http.StatusNotFound, "Box not found")
		return
	}

	ctx.HTML(http.StatusOK, "box.html", gin.H{
		"BoxID":       boxID,
		"Files":       files,
		"FileCount":   len(files),
		"DownloadAll": "/box/" + boxID + "/download",
		"PollMS":      helpers.EnvInt("WARPBOX_BOX_POLL_INTERVAL_MS", 5000, 1000),
	})
}

func handleBoxStatus(ctx *gin.Context) {
	boxID := ctx.Param("id")
	if !boxstore.ValidBoxID(boxID) {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid box id"})
		return
	}

	files, err := boxstore.ListFiles(boxID)
	if err != nil {
		ctx.JSON(http.StatusNotFound, gin.H{"error": "Box not found"})
		return
	}

	ctx.JSON(http.StatusOK, gin.H{"box_id": boxID, "files": files})
}

func handleDownloadBox(ctx *gin.Context) {
	boxID := ctx.Param("id")
	if !boxstore.ValidBoxID(boxID) {
		ctx.String(http.StatusBadRequest, "Invalid box id")
		return
	}

	files, err := boxstore.ListFiles(boxID)
	if err != nil {
		ctx.String(http.StatusNotFound, "Box not found")
		return
	}

	ctx.Header("Content-Type", "application/zip")
	ctx.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="warpbox-%s.zip"`, boxID))

	zipWriter := zip.NewWriter(ctx.Writer)
	defer zipWriter.Close()

	for _, file := range files {
		if !file.IsComplete {
			continue
		}

		if err := boxstore.AddFileToZip(zipWriter, boxID, file.Name); err != nil {
			ctx.Status(http.StatusInternalServerError)
			return
		}
	}
}

func handleDownloadFile(ctx *gin.Context) {
	boxID := ctx.Param("id")
	filename, ok := helpers.SafeFilename(ctx.Param("filename"))
	if !boxstore.ValidBoxID(boxID) || !ok {
		ctx.String(http.StatusBadRequest, "Invalid file")
		return
	}

	path, ok := boxstore.SafeBoxFilePath(boxID, filename)
	if !ok {
		ctx.String(http.StatusBadRequest, "Invalid file")
		return
	}

	if _, err := os.Stat(path); err != nil {
		ctx.String(http.StatusNotFound, "File not found")
		return
	}

	ctx.FileAttachment(path, filename)
}

func handleCreateBox(ctx *gin.Context) {
	boxID, err := boxstore.NewBoxID()
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Could not create upload box"})
		return
	}

	if err := os.MkdirAll(boxstore.BoxPath(boxID), 0755); err != nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Could not prepare upload box"})
		return
	}

	var request models.CreateBoxRequest
	if err := ctx.ShouldBindJSON(&request); err != nil && err != io.EOF {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid box payload"})
		return
	}

	files, err := boxstore.CreateManifest(boxID, request.Files)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	ctx.JSON(http.StatusOK, gin.H{"box_id": boxID, "box_url": "/box/" + boxID, "files": files})
}

func handleManifestFileUpload(ctx *gin.Context) {
	boxID := ctx.Param("id")
	fileID := ctx.Param("file_id")
	if !boxstore.ValidBoxID(boxID) {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid box id"})
		return
	}

	file, err := ctx.FormFile("file")
	if err != nil {
		boxstore.MarkFileStatus(boxID, fileID, models.FileStatusFailed)
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "No file received"})
		return
	}

	savedFile, err := boxstore.SaveManifestUpload(boxID, fileID, file)
	if err != nil {
		boxstore.MarkFileStatus(boxID, fileID, models.FileStatusFailed)
		ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	ctx.JSON(http.StatusOK, gin.H{"box_id": boxID, "box_url": "/box/" + boxID, "file": savedFile})
}

func handleFileStatusUpdate(ctx *gin.Context) {
	boxID := ctx.Param("id")
	fileID := ctx.Param("file_id")
	if !boxstore.ValidBoxID(boxID) {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid box id"})
		return
	}

	var request models.UpdateFileStatusRequest
	if err := ctx.ShouldBindJSON(&request); err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid status payload"})
		return
	}

	file, err := boxstore.MarkFileStatus(boxID, fileID, request.Status)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	ctx.JSON(http.StatusOK, gin.H{"file": file})
}

func handleDirectBoxUpload(ctx *gin.Context) {
	boxID := ctx.Param("id")
	if !boxstore.ValidBoxID(boxID) {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid box id"})
		return
	}

	file, err := ctx.FormFile("file")
	if err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "No file received"})
		return
	}

	savedFile, err := boxstore.SaveUpload(boxID, file)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	ctx.JSON(http.StatusOK, gin.H{"box_id": boxID, "box_url": "/box/" + boxID, "file": savedFile})
}

func handleLegacyUpload(ctx *gin.Context) {
	form, err := ctx.MultipartForm()
	if err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "No files received"})
		return
	}

	files := form.File["files"]
	if len(files) == 0 {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "No files received"})
		return
	}

	boxID, err := boxstore.NewBoxID()
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Could not create upload box"})
		return
	}

	if err := os.MkdirAll(boxstore.BoxPath(boxID), 0755); err != nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Could not prepare upload box"})
		return
	}

	savedFiles := make([]models.BoxFile, 0, len(files))
	for _, file := range files {
		savedFile, err := boxstore.SaveUpload(boxID, file)
		if err != nil {
			ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}

		savedFiles = append(savedFiles, savedFile)
	}

	ctx.JSON(http.StatusOK, gin.H{"box_id": boxID, "box_url": "/box/" + boxID, "files": savedFiles})
}