package admin

import (
	"net/http"
	"net/url"
	"strconv"
	"strings"

	"forge.cadoles.com/cadoles/bouncer/internal/store"
	"github.com/go-chi/chi/v5"
	"github.com/pkg/errors"
	"gitlab.com/wpetit/goweb/api"
	"gitlab.com/wpetit/goweb/logger"
)

type QueryProxyResponse struct {
	Proxies []*store.ProxyHeader `json:"proxies"`
}

func (s *Server) queryProxy(w http.ResponseWriter, r *http.Request) {
	limit, ok := getIntQueryParam(w, r, "limit", 10)
	if !ok {
		return
	}

	offset, ok := getIntQueryParam(w, r, "offset", 0)
	if !ok {
		return
	}

	options := []store.QueryProxyOptionFunc{
		store.WithProxyQueryLimit(int(limit)),
		store.WithProxyQueryOffset(int(offset)),
	}

	ids, ok := getStringableSliceValues[store.ProxyID](w, r, "ids", nil)
	if !ok {
		return
	}

	if ids != nil {
		options = append(options, store.WithProxyQueryIDs(ids...))
	}

	ctx := r.Context()

	proxies, err := s.proxyRepository.QueryProxy(
		ctx,
		options...,
	)
	if err != nil {
		logger.Error(ctx, "could not list proxies", logger.E(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil)

		return
	}

	api.DataResponse(w, http.StatusOK, QueryProxyResponse{
		Proxies: proxies,
	})
}

type GetProxyResponse struct {
	Proxy *store.Proxy `json:"proxy"`
}

func (s *Server) getProxy(w http.ResponseWriter, r *http.Request) {
	proxyID, ok := getProxyID(w, r)
	if !ok {
		return
	}

	ctx := r.Context()

	proxy, err := s.proxyRepository.GetProxy(ctx, proxyID)
	if err != nil {
		if errors.Is(err, store.ErrNotFound) {
			api.ErrorResponse(w, http.StatusNotFound, api.ErrCodeNotFound, nil)

			return
		}

		logger.Error(ctx, "could not get proxy", logger.E(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil)

		return
	}

	api.DataResponse(w, http.StatusOK, GetProxyResponse{
		Proxy: proxy,
	})
}

type DeleteProxyResponse struct {
	ProxyID store.ProxyID `json:"proxyId"`
}

func (s *Server) deleteProxy(w http.ResponseWriter, r *http.Request) {
	proxyID, ok := getProxyID(w, r)
	if !ok {
		return
	}

	ctx := r.Context()

	if err := s.proxyRepository.DeleteProxy(ctx, proxyID); err != nil {
		if errors.Is(err, store.ErrNotFound) {
			api.ErrorResponse(w, http.StatusNotFound, api.ErrCodeNotFound, nil)

			return
		}

		logger.Error(ctx, "could not delete proxy", logger.E(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil)

		return
	}

	api.DataResponse(w, http.StatusOK, DeleteProxyResponse{
		ProxyID: proxyID,
	})
}

type CreateProxyRequest struct {
	To   string   `json:"to" validate:"required"`
	From []string `json:"from" validate:"required"`
}

type CreateProxyResponse struct {
	Proxy *store.Proxy `json:"proxy"`
}

func (s *Server) createProxy(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	createProxyReq := &CreateProxyRequest{}
	if ok := api.Bind(w, r, createProxyReq); !ok {
		return
	}

	to, err := url.Parse(createProxyReq.To)
	if err != nil {
		logger.Error(r.Context(), "could not parse to parameter", logger.E(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusBadRequest, api.ErrCodeMalformedRequest, nil)

		return
	}

	proxy, err := s.proxyRepository.CreateProxy(ctx, to, createProxyReq.From...)
	if err != nil {
		logger.Error(ctx, "could not update agent", logger.E(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil)

		return
	}

	api.DataResponse(w, http.StatusOK, struct {
		Proxy *store.Proxy `json:"proxy"`
	}{
		Proxy: proxy,
	})
}

type UpdateProxyRequest struct{}

func (s *Server) updateProxy(w http.ResponseWriter, r *http.Request) {
}

func getProxyID(w http.ResponseWriter, r *http.Request) (store.ProxyID, bool) {
	rawProxyID := chi.URLParam(r, "proxyID")

	proxyID, err := store.ParseProxyID(rawProxyID)
	if err != nil {
		logger.Error(r.Context(), "could not parse proxy id", logger.E(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusBadRequest, api.ErrCodeMalformedRequest, nil)

		return "", false
	}

	return proxyID, true
}

func getIntQueryParam(w http.ResponseWriter, r *http.Request, param string, defaultValue int64) (int64, bool) {
	rawValue := r.URL.Query().Get(param)
	if rawValue != "" {
		value, err := strconv.ParseInt(rawValue, 10, 64)
		if err != nil {
			logger.Error(r.Context(), "could not parse int param", logger.F("param", param), logger.E(errors.WithStack(err)))
			api.ErrorResponse(w, http.StatusBadRequest, api.ErrCodeMalformedRequest, nil)

			return 0, false
		}

		return value, true
	}

	return defaultValue, true
}

func getStringSliceValues(w http.ResponseWriter, r *http.Request, param string, defaultValue []string) ([]string, bool) {
	rawValue := r.URL.Query().Get(param)
	if rawValue != "" {
		values := strings.Split(rawValue, ",")

		return values, true
	}

	return defaultValue, true
}

func getStringableSliceValues[T ~string](w http.ResponseWriter, r *http.Request, param string, defaultValue []T) ([]T, bool) {
	rawValue := r.URL.Query().Get(param)

	if rawValue != "" {
		rawValues := strings.Split(rawValue, ",")
		ids := make([]T, 0, len(rawValues))

		for _, rv := range rawValues {
			id, err := store.ParseID[T](rv)
			if err != nil {
				logger.Error(r.Context(), "could not parse ids slice param", logger.F("param", param), logger.E(errors.WithStack(err)))
				api.ErrorResponse(w, http.StatusBadRequest, api.ErrCodeMalformedRequest, nil)

				return nil, false
			}

			ids = append(ids, id)
		}

		return ids, true
	}

	return defaultValue, true
}