package handlers

import (
	"bufio"
	"io"
	"log"
	"net/http"
	"strconv"

	"github.com/gofiber/fiber/v3"
	"lmika.dev/lmika/weiro/services/uploads"
	"lmika.dev/pkg/modash/moslice"
)

type UploadsHandler struct {
	UploadsService *uploads.Service
}

func (uh UploadsHandler) Index(c fiber.Ctx) error {
	uploads, err := uh.UploadsService.ListUploads(c.Context())
	if err != nil {
		return err
	}

	rows := moslice.Batch(uploads, 5)

	return c.Render("uploads/index", fiber.Map{"uploads": rows})
}

func (uh UploadsHandler) Show(c fiber.Ctx) error {
	uploadIDStr := c.Params("uploadID")
	if uploadIDStr == "" {
		return fiber.ErrBadRequest
	}
	uploadID, err := strconv.ParseInt(uploadIDStr, 10, 64)
	if err != nil {
		return fiber.ErrBadRequest
	}

	upload, err := uh.UploadsService.FetchUpload(c.Context(), uploadID)
	if err != nil {
		return err
	}

	return c.Render("uploads/show", fiber.Map{"upload": upload})
}

func (uh UploadsHandler) ShowRaw(c fiber.Ctx) error {
	uploadIDStr := c.Params("uploadID")
	if uploadIDStr == "" {
		return fiber.ErrBadRequest
	}
	uploadID, err := strconv.ParseInt(uploadIDStr, 10, 64)
	if err != nil {
		return fiber.ErrBadRequest
	}

	upload, rwFn, err := uh.UploadsService.OpenUpload(c.Context(), uploadID)
	if err != nil {
		log.Print(err)
		return err
	}

	c.Set("Content-Type", upload.MIMEType)
	c.Status(http.StatusOK)
	return c.SendStreamWriter(func(w *bufio.Writer) {
		rw, err := rwFn()
		if err != nil {
			return
		}
		defer rw.Close()

		_, err = io.Copy(w, rw)
		if err != nil {
			return
		}
	})

}

func (uh UploadsHandler) New(c fiber.Ctx) error {
	var req uploads.NewPendingRequest

	if err := c.Bind().Body(&req); err != nil {
		return err
	}

	res, err := uh.UploadsService.NewPending(c.Context(), req)
	if err != nil {
		return err
	}

	return c.JSON(res)
}

func (uh UploadsHandler) UploadPart(c fiber.Ctx) error {
	guid := c.Params("guid")
	if guid == "" {
		return fiber.ErrBadRequest
	}

	if err := uh.UploadsService.WriteToPending(c.Context(), guid, c.Body()); err != nil {
		return err
	}

	return c.Status(fiber.StatusAccepted).JSON(fiber.Map{})
}

func (uh UploadsHandler) UploadComplete(c fiber.Ctx) error {
	guid := c.Params("guid")
	if guid == "" {
		return fiber.ErrBadRequest
	}

	var res struct {
		Hash string `json:"hash"`
	}
	if err := c.Bind().Body(&res); err != nil {
		return err
	}

	if err := uh.UploadsService.FinalizePending(c.Context(), guid, res.Hash); err != nil {
		return err
	}

	return c.Status(fiber.StatusAccepted).JSON(fiber.Map{})
}