package drive

import (
	"io"
	"log/slog"
	"net/http"

	"github.com/go-chi/chi/v5"

	"github.com/ultisuite/ulti-backend/internal/api/apiresponse"
	"github.com/ultisuite/ulti-backend/internal/api/apivalidate"
	"github.com/ultisuite/ulti-backend/internal/api/middleware"
	"github.com/ultisuite/ulti-backend/internal/api/query"
	"github.com/ultisuite/ulti-backend/internal/nextcloud"
	"github.com/ultisuite/ulti-backend/internal/permission"
)

type Handler struct {
	svc    *Service
	logger *slog.Logger
}

func NewHandler(nc *nextcloud.Client) *Handler {
	return &Handler{
		svc:    NewService(nc),
		logger: slog.Default().With("component", "drive-api"),
	}
}

func (h *Handler) Routes() chi.Router {
	r := chi.NewRouter()
	read := middleware.RequirePermission(permission.ResourceDrive, permission.LevelRead)
	write := middleware.RequirePermission(permission.ResourceDrive, permission.LevelWrite)
	admin := middleware.RequirePermission(permission.ResourceDrive, permission.LevelAdmin)

	r.With(read).Get("/files/*", h.ListFiles)
	r.With(read).Get("/download/*", h.Download)
	r.With(write).Post("/files/*", h.Upload)
	r.With(write).Delete("/files/*", h.DeleteFile)
	r.With(write).Post("/folders/*", h.CreateFolder)
	r.With(write).Post("/move", h.Move)
	r.With(admin).Post("/shares", h.CreateShare)

	return r
}

func (h *Handler) ListFiles(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	params, err := query.ParseListRequest(r)
	if err != nil {
		apivalidate.WriteQueryError(w, r, err)
		return
	}

	path := chi.URLParam(r, "*")
	result, err := h.svc.ListFiles(r.Context(), claims.Sub, path, params)
	if err != nil {
		h.logger.Error("list files", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	apiresponse.WriteJSON(w, http.StatusOK, result)
}

func (h *Handler) Upload(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	path := chi.URLParam(r, "*")
	if verr := validatePath(path); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}

	if err := h.svc.Upload(r.Context(), claims.Sub, path, r.Body, r.Header.Get("Content-Type")); err != nil {
		h.logger.Error("upload", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	apiresponse.WriteJSON(w, http.StatusCreated, map[string]string{"status": "uploaded", "path": path})
}

func (h *Handler) Download(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	path := chi.URLParam(r, "*")
	if verr := validatePath(path); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}

	body, contentType, err := h.svc.Download(r.Context(), claims.Sub, path)
	if err != nil {
		apivalidate.WriteNotFound(w, r, "not found")
		return
	}
	defer body.Close()

	w.Header().Set("Content-Type", contentType)
	io.Copy(w, body)
}

func (h *Handler) DeleteFile(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	path := chi.URLParam(r, "*")
	if verr := validatePath(path); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}

	if err := h.svc.Delete(r.Context(), claims.Sub, path); err != nil {
		h.logger.Error("delete file", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	w.WriteHeader(http.StatusNoContent)
}

func (h *Handler) CreateFolder(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	path := chi.URLParam(r, "*")
	if verr := validatePath(path); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}

	if err := h.svc.CreateFolder(r.Context(), claims.Sub, path); err != nil {
		h.logger.Error("create folder", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	w.WriteHeader(http.StatusCreated)
}

func (h *Handler) Move(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())

	var req moveRequest
	if err := apivalidate.DecodeJSON(w, r, maxJSONRequestBody, &req); err != nil {
		return
	}
	if verr := validateMoveRequest(&req); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}

	if err := h.svc.Move(r.Context(), claims.Sub, req.Source, req.Destination); err != nil {
		h.logger.Error("move", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	w.WriteHeader(http.StatusNoContent)
}

func (h *Handler) CreateShare(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())

	var req createShareRequest
	if err := apivalidate.DecodeJSON(w, r, maxJSONRequestBody, &req); err != nil {
		return
	}
	if verr := validateCreateShareRequest(&req); verr != nil {
		apivalidate.WriteValidationError(w, r, verr)
		return
	}

	share, err := h.svc.CreateShare(r.Context(), claims.Sub, req.Path, req.ShareType, req.Permissions)
	if err != nil {
		h.logger.Error("create share", "error", err)
		apivalidate.WriteInternal(w, r)
		return
	}
	apiresponse.WriteJSON(w, http.StatusCreated, share)
}