package httpRequest

import (
	"net/http"
	"time"

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

	"github.com/google/uuid"
)

func haveHubUserPermissionsOnChannel(permissions types.CachedUserPermissions, user *types.HubUser, channel *types.HubChannel) bool {
	channel.Mu.RLock()
	checkAgainst, ok := channel.UsersCachedPermissions[user.OriginalId]
	channel.Mu.RUnlock()
	if !ok || (permissions&checkAgainst) != permissions {
		return false
	}
	return true
}

func addHubUserToPermissionCache(hub *types.Hub, user *types.HubUser) {
	user.Mu.RLock()
	roles := user.Roles
	userId := user.OriginalId
	user.Mu.RUnlock()

	for _, group := range hub.Groups {
		if group == nil {
			continue
		}
		if !roles.HasSameId(group.RolesCanView) {
			continue
		}
		group.UsersCachedPermissions[userId] = types.CachedUserCanView

		for _, channel := range group.Channels {
			var perms types.CachedUserPermissions

			if roles.HasSameId(channel.RolesCanView) {
				perms |= types.CachedUserCanView
			}
			if roles.HasSameId(channel.RolesCanReadHistory) {
				perms |= types.CachedUserCanReadHistory
			}
			if roles.HasSameId(channel.RolesCanMessage) {
				perms |= types.CachedUserCanMessage
			}
			channel.Mu.Lock()
			channel.UsersCachedPermissions[userId] = perms
			channel.Mu.Unlock()
		}
	}
}

func HandleHubCreate(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(&response, request, normal) {
		return
	}

	ctx := request.Context()
	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	hubName := request.FormValue("hubname")
	if hubName == "" {
		http.Error(response, "hub name is required", http.StatusBadRequest)
		return
	}

	hub := types.NewHub()
	hub.Name = hubName
	hub.Color = types.Rgba{}.GetRandom()
	hub.Id = uuid.New()
	hub.Creator = user.Id
	hub.CreatedAt = time.Now()

	creator := types.NewHubUser()
	creator.OriginalId = user.Id
	creator.CreatedAt = hub.CreatedAt
	hub.Users[creator.OriginalId] = creator

	rootRole := &types.HubRole{
		Id:          uint8(0),
		Permissions: types.PermissionAll(),
		Name:        "root",
		Color:       types.Rgba{}.GetRandom(),
		CreatedAt:   hub.CreatedAt,
	}
	hub.Roles[rootRole.Id] = rootRole
	creator.Roles.Add(rootRole.Id)

	memberRole := &types.HubRole{
		Id:        types.HubBoundRolesMax,
		Name:      "member",
		Color:     types.Rgba{}.GetRandom(),
		CreatedAt: hub.CreatedAt,
	}
	hub.JoinRole = memberRole
	hub.Roles[memberRole.Id] = memberRole
	creator.Roles.Add(memberRole.Id)

	rootGroup := types.NewHubGroup()
	rootGroup.Name = "root"
	rootGroup.Id = uint8(1)
	rootGroup.Color = types.Rgba{}.GetRandom()
	rootGroup.CreatedAt = hub.CreatedAt
	rootGroup.RolesCanView.Add(rootRole.Id)
	rootGroup.RolesCanView.Add(memberRole.Id)
	hub.Groups[rootGroup.Id] = rootGroup

	channel := types.NewHubChannel()
	channel.Name = "main channel"
	channel.Position = uint8(0)
	channel.Id = uuid.New()
	channel.ParentId = rootGroup.Id
	channel.Description = "The fist channel!"
	channel.CreatedAt = hub.CreatedAt
	channel.RolesCanMessage.Add(rootGroup.Id)
	channel.RolesCanMessage.Add(memberRole.Id)
	channel.RolesCanView.Add(rootGroup.Id)
	channel.RolesCanView.Add(memberRole.Id)
	channel.RolesCanReadHistory.Add(rootGroup.Id)
	channel.RolesCanReadHistory.Add(memberRole.Id)
	channel.UsersCachedPermissions[creator.OriginalId] = types.CachedUserPermissionsAll
	rootGroup.Channels[channel.Id] = channel

	cache.SaveHub(hub)
}

func HandleHubJoin(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(&response, request, normal) {
		return
	}
	ctx := request.Context()
	user, err := getUserByToken(ctx, request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusBadRequest)
		return
	}
	hub, err := getHubByIdStr(ctx, request.Header.Get("hubid"))
	if err != nil {
		http.Error(response, "invalid hubid", http.StatusBadRequest)
		return
	}

	hubUser := types.NewHubUser()
	hubUser.OriginalId = user.Id
	hubUser.Roles.Add(hub.JoinRole.Id)
	hubUser.CreatedAt = time.Now()
	hub.Users[hubUser.OriginalId] = hubUser
	addHubUserToPermissionCache(hub, hubUser)
}