package httpRequest

import (
	"context"
	"errors"
	"net/http"

	"go-socket/packages/convertions"

	"go-socket/packages/cache"
	"go-socket/packages/postgresql"
	"go-socket/packages/tokens"
	"go-socket/packages/types"

	"github.com/google/uuid"
)

func getUserById(ctx context.Context, userId uuid.UUID) (*types.User, error) {
	user, err := cache.GetUserById(userId)
	if err != nil {
		user = &types.User{Id: userId, Hubs: make(map[uuid.UUID]*types.Hub)}
		err = postgresql.GetWholeUser(ctx, user)
		if err != nil {
			return nil, err
		}
	}

	return user, nil
}

func getUserByToken(ctx context.Context, token string) (*types.User, error) {
	userId, err := tokens.TokenValidateGetId(token)
	if err != nil {
		return nil, err
	}
	return getUserById(ctx, userId)
}

func getConnectionWithResponseOnFail(response http.ResponseWriter, connectionIdStr string, user *types.User) (*types.Connection, bool) {
	connectionId, err := convertions.StringToUuid(connectionIdStr)
	if err != nil {
		http.Error(response, "invalid connectionid", http.StatusBadRequest)
		return nil, false
	}
	conn, ok := cache.GetConnection(user, connectionId)
	if !ok {
		http.Error(response, "invalid connectionid", http.StatusBadRequest)
		return nil, false
	}
	return conn, true
}

func getHubByIdStr(ctx context.Context, hubId string) (*types.Hub, error) {
	hubUuid, err := convertions.StringToUuid(hubId)
	if err != nil {
		return nil, err
	}

	hub, ok := cache.GetHubById(hubUuid)

	if !ok {
		return nil, errors.New("hub not found")
	}

	return hub, nil
}

func getHubUserIfValidWithResponseOnFail(ctx context.Context, response http.ResponseWriter, request *http.Request) (
	*types.User, *types.HubUser, *types.Hub, error) {
	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusBadRequest)
		return nil, nil, nil, errors.New("invalid token")
	}

	hub, err := getHubByIdStr(ctx, request.Header.Get("hub_id"))
	if err != nil {
		http.Error(response, "invalid hub_id", http.StatusBadRequest)
		return nil, nil, nil, errors.New("no such hub")
	}

	hub.Mu.RLock()
	hubUser, ok := hub.Users[user.Id]
	hub.Mu.RUnlock()
	if !ok {
		http.Error(response, "invalid hub_id", http.StatusUnauthorized)
		return nil, nil, nil, errors.New("invalid hub_id")
	}

	return user, hubUser, hub, nil
}

func getHubChannelIfValidWithResponseOnFail(ctx context.Context, response http.ResponseWriter, hub *types.Hub, hubUser *types.HubUser, channelId string) (
	*types.HubChannel, error) {
	channelUuid, err := convertions.StringToUuid(channelId)
	if err != nil {
		http.Error(response, "invalid channel_id", http.StatusBadRequest)
		return nil, errors.New("invalid channel_id")
	}

	hub.Mu.RLock()
	channel, ok := hub.Channels[channelUuid]
	hub.Mu.RUnlock()
	if !ok {
		http.Error(response, "channel not found", http.StatusNotFound)
		return nil, errors.New("channel not found")
	}

	if !haveHubUserCachedPermissions(types.CachedUserCanView, hubUser, channel) {
		http.Error(response, "forbidden", http.StatusForbidden)
		return nil, errors.New("forbidden")
	}

	return channel, nil
}