package routes

import (
	"log/slog"
	"net/http"
	"orbits-server/internal/server/api/assets"
	"orbits-server/internal/server/bootstrap"
	"orbits-server/internal/server/service"
	"path/filepath"

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

func RegisterFileRoutes(file *gin.RouterGroup, env bootstrap.Environment, db *gorm.DB) {
	fileService := service.NewFileService(db, env)
	// prefix: file
	// for example: /file/<file-name>

	// file download route / display contents
	file.GET("/:filename", func(c *gin.Context) {
		fileParam := c.Param("filename")
		p := filepath.Join(env.ContentDirectory, fileParam)

		c.File(p)
	})

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

		stream, err := fh.Open()
		if err != nil {
			slog.Error("failed to a reader stream")
			assets.InternalErrorResponse(c)
			return
		}
		defer stream.Close()

		fileRecord, err := fileService.Create(stream, fh.Filename)
		if err != nil {
			slog.Error("failed to enroll file to the database", "error", err)
			assets.InternalErrorResponse(c)
			return
		}

		// save to filesystem after everything has given a green light
		if err := c.SaveUploadedFile(fh, fileRecord.FilePath); err != nil {
			slog.Error("failed to save to disk, rolling back database", "error", err)

			// rollback db if the write has failed
			fileService.DeleteByID(fileRecord.ID)

			// give the response to the client
			assets.InternalErrorResponse(c)
			return
		}
		slog.Info("saved file to local filesystem and database")

		c.JSON(http.StatusCreated, assets.BasicResponse{
			Msg:  "file has succesfully been uploaded",
			Data: fileRecord,
		})
	})

	// delete route
	file.DELETE("/:filename", func(c *gin.Context) {
		fileParam := c.Param("filename")
		fileRecord, err := fileService.DeleteByName(fileParam)
		if err != nil {
			slog.Error("file not found", "error", err)
			c.JSON(http.StatusNotFound, assets.BasicResponse{
				Msg: "file was not found",
			})
			return
		}

		slog.Info("received a delete request for a file", "file", fileRecord, "filename", fileParam)
		c.JSON(http.StatusOK, assets.BasicResponse{
			Msg: "file deleted succesfully",
		})
	})

	// define a route to check what is registered
	file.GET("/available", func(c *gin.Context) {
		files, err := fileService.ListFiles()
		if err != nil {
			slog.Error("failed to retrieve available files", "error", err)
			assets.InternalErrorResponse(c)
			return
		}

		c.JSON(http.StatusOK, assets.BasicResponse{
			Msg:  assets.OkMes,
			Data: files,
		})
	})
}