package handlers

import (
	"context"
	"crypto/rand"
	"encoding/hex"
	"fmt"
	"net/http"
	"os"
	"path"
	"path/filepath"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/vaultdrop/backend/internal/db"
	"github.com/vaultdrop/backend/internal/service"
)

// retourne qui est delete qui est updated et created
func (h *Handlers) SyncFiles(c *gin.Context) {
	c.JSON(http.StatusNotImplemented, gin.H{
		"error": gin.H{
			"code":    "NOT_IMPLEMENTED",
			"message": "Sync not yet implemented",
		},
	})
}

func (h *Handlers) ListFiles(c *gin.Context) {

	dirs, err := os.ReadDir("./uploads/")

	if err != nil {

		c.JSON(http.StatusInternalServerError, gin.H{
			"data": []interface{}{},
			"meta": gin.H{
				"page":  1,
				"total": 0,
			},
		})

		return
	}

	type Finfo struct {
		Url  string   `json:"url"`
		Name string   `json:"name"`
		Size int64    `json:"size"`
		Tags []string `json:"tags"`
	}

	files := []Finfo{}

	for _, dir := range dirs {

		if dir.IsDir() {
			continue
		}

		i, e := dir.Info()

		if e != nil {
			continue
		}

		ps := Finfo{
			Url:  service.GenerateFileDownloadUrl(i.Name()),
			Name: i.Name(),
			Size: i.Size(),
			Tags: []string{},
		}

		files = append(files, ps)

	}

	c.JSON(http.StatusOK, gin.H{
		"data": files,
		"meta": gin.H{
			"page":  1,
			"total": 0,
		},
	})
}

func (h *Handlers) ListFile(c *gin.Context) {

	id := c.Param("id")

	dirs, err := os.ReadDir("./uploads/")

	if err != nil {

		c.JSON(http.StatusInternalServerError, gin.H{
			"data": []interface{}{},
			"meta": gin.H{
				"page":  1,
				"total": 0,
			},
		})

		return
	}

	type Finfo struct {
		Url  string   `json:"url"`
		Name string   `json:"name"`
		Size int64    `json:"size"`
		Tags []string `json:"tags"`
	}

	file := Finfo{}

	for _, dir := range dirs {

		if dir.IsDir() {
			continue
		}

		i, e := dir.Info()

		if e != nil {
			continue
		}

		if id != i.Name() {
			continue
		}

		ps := Finfo{
			Url:  service.GenerateFileDownloadUrl(i.Name()),
			Name: i.Name(),
			Size: i.Size(),
			Tags: []string{},
		}

		file = ps

		break

	}

	c.JSON(http.StatusOK, gin.H{
		"data": file,
		"meta": gin.H{
			"total": 1,
		},
	})
}

func (h *Handlers) GetFile(c *gin.Context) {

	exp, _ := strconv.ParseInt(c.Query("expires"), 10, 64)

	r := service.Validate(c.Params.ByName("id"), c.Query("sig"), exp)

	if r != true {

		c.JSON(http.StatusForbidden, gin.H{
			"error": gin.H{
				"code":    "FILE_NOT_FOUND",
				"message": "File not found",
			},
		})

		return

	}

	c.File(path.Join("./uploads/", c.Params.ByName("id")))

}

func (h *Handlers) UploadFiles(c *gin.Context) {

	form, err := c.MultipartForm()
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"error": gin.H{
				"code":    "ERROR_PARSING",
				"message": "Error while parsing multipart form",
			},
		})
		return
	}
	files := form.File["file"]

	type FileStats struct {
		Name string `json:"name"`
		Id   string `json:"id"`
	}

	filesStats := []FileStats{}

	for _, file := range files {

		dst := filepath.Join("./uploads/", filepath.Base(file.Filename))

		err = c.SaveUploadedFile(file, dst)

		if err != nil {

			c.JSON(http.StatusInternalServerError, gin.H{
				"error": gin.H{
					"code":    "ERROR",
					"message": "Uploaded",
				},
			})

			return

		}

		fileByte, err := os.ReadFile(dst)

		if err != nil {

			c.JSON(http.StatusInternalServerError, gin.H{
				"error": gin.H{
					"code":    "ERROR",
					"message": "Error reading file",
				},
			})

			return

		}
		checksum := service.CreateSHA256Hash(fileByte)

		ctx := context.Background()

		id := make([]byte, 16)
		rand.Read(id)

		createFileParams := db.CreateFileParams{
			ID:         hex.EncodeToString(id),
			Name:       file.Filename,
			Size:       file.Size,
			StorageKey: dst,
			Checksum:   hex.EncodeToString(checksum),
		}

		dbFile, err := h.queries.CreateFile(ctx, createFileParams)
		if err != nil {

			fmt.Println(err)

			c.JSON(http.StatusInternalServerError, gin.H{
				"error": gin.H{
					"code":    "DB_ERROR",
					"message": "Failed to save file metadata",
				},
			})
			return
		}

		filesStats = append(filesStats, FileStats{
			Name: dbFile.Name,
			Id:   dbFile.ID,
		})

	}

	c.JSON(http.StatusOK, gin.H{
		"data": filesStats,
	})

}

func (h *Handlers) DeleteFile(c *gin.Context) {
	c.JSON(http.StatusNotImplemented, gin.H{
		"error": gin.H{
			"code":    "NOT_IMPLEMENTED",
			"message": "Delete not yet implemented",
		},
	})
}

func (h *Handlers) SearchFiles(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"data": []interface{}{},
		"meta": gin.H{
			"page":  1,
			"total": 0,
		},
	})
}

func (h *Handlers) AddTags(c *gin.Context) {
	c.JSON(http.StatusNotImplemented, gin.H{
		"error": gin.H{
			"code":    "NOT_IMPLEMENTED",
			"message": "Add tags not yet implemented",
		},
	})
}

func (h *Handlers) GetTags(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"data": []interface{}{},
	})
}