package api

import (
	"eden-server/internal/crypto"
	"eden-server/internal/database"
	"eden-server/internal/utility"
	"errors"
	"log/slog"
	"net/http"
	"path/filepath"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"gorm.io/gorm"
)

func spawnFileRoutes(file *gin.RouterGroup, env utility.Environment, db *gorm.DB) {
	// /file/<file-name>
	file.GET("/:filename", func(c *gin.Context) {
		f := c.Param("filename")
		p := filepath.Join(env.DataDirectory, "content", f)

		c.File(p)
	})

	// define the upload route
	// /file/upload
	file.POST("/upload", func(c *gin.Context) {
		f, err := c.FormFile("file")
		if err != nil {
			slog.Debug("no file or file headers provided on the request", "error", err)
			c.JSON(http.StatusBadRequest, RespObj{
				Msg: "a file is required",
			})
			return
		}

		checksum, err := crypto.CalculateHashFromRequest(f)
		if err != nil {
			slog.Error("failed to calculate hash of file at given path", "error", err)
			c.JSON(http.StatusInternalServerError, RespObj{
				Msg: ieMes,
			})
			return
		}

		e := filepath.Ext(f.Filename)
		m := categorizeFilemode(e)
		if m == database.Unspecified {
			slog.Debug("discarding file since its filetype is unsupported")
			c.JSON(http.StatusUnsupportedMediaType, RespObj{
				Msg: "unsupported filetype",
			})
			return
		}

		safeName := uuid.New().String() + "_" + string(m) + e
		destPath := filepath.Join(env.DataDirectory, "content", safeName)

		fData := database.File{
			MediaType: m,
			MetaName:  f.Filename,
			FileName:  safeName,
			FilePath:  destPath,
			Checksum:  checksum,
		}

		// first register the file to the database
		// error out if something bad happens (duplicate, failing db, etc)
		err = database.RegisterFile(db, fData)
		if err != nil {
			if errors.Is(err, gorm.ErrDuplicatedKey) {
				slog.Debug("discarding file since its a duplicate", "error", err)
				c.JSON(http.StatusConflict, RespObj{
					Msg: "file is a duplicate",
				})
				return
			}

			slog.Error("discarding file since an error occured", "error", err)
			c.JSON(http.StatusInternalServerError, RespObj{
				Msg: ieMes,
			})
			return
		}

		// save to filesystem after everything has given a green light
		if err := c.SaveUploadedFile(f, destPath); err != nil {
			slog.Error("failed to receive the file over http:", "error", err)
			c.JSON(http.StatusInternalServerError, RespObj{
				Msg: ieMes,
			})
			return
		}

		c.JSON(http.StatusCreated, RespObj{
			Msg: "file has succesfully been uploaded",
		})
	})
}