package httpRequest

import (
	"encoding/json"
	"maps"
	"net/http"
	"slices"
	"time"

	"go-socket/packages/Enums/WsEventType"
	"go-socket/packages/cache"
	"go-socket/packages/convertions"
	"go-socket/packages/passwords"
	"go-socket/packages/postgresql"
	"go-socket/packages/tokens"
	"go-socket/packages/types"
	"go-socket/packages/wsServer"

	"golang.org/x/crypto/bcrypt"

	"github.com/google/uuid"
)

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

	username := request.FormValue("username")
	if len(username) < 4 {
		http.Error(response, "no or short username", http.StatusBadRequest)
		return
	}

	password := request.FormValue("password")

	if len(password) < 8 {
		http.Error(response, "no or short passwords", http.StatusBadRequest)
		return
	}

	var (
		user *types.User
		err  error
		ctx  = request.Context()
	)

	user, err = cache.GetUserByName(username)
	if err != nil {
		user = &types.User{Name: username, Hubs: make(map[uuid.UUID]*types.Hub)}
		if err = postgresql.UserGetStandardInfoByName(ctx, user); err != nil {
			http.Error(response, "bad login", http.StatusUnauthorized)
			return
		}
		if err = postgresql.GetWholeUser(ctx, user); err != nil {
			http.Error(response, err.Error(), http.StatusInternalServerError)
			return
		}
	}

	err = bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password))
	if err != nil {
		http.Error(response, "bad login", http.StatusUnauthorized)
		return
	}

	token, err := tokens.TokenCreate(user.Id)
	if err != nil {
		http.Error(response, "internal server error", http.StatusInternalServerError)
		return
	}

	data, err := json.Marshal(types.LoginResponse{Token: token, UserId: user.Id})
	if err != nil {
		http.Error(response, "internal server error", http.StatusInternalServerError)
		return
	}

	response.WriteHeader(http.StatusCreated)
	response.Write(data)
}

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

	username := request.FormValue("username")
	if len(username) < 4 || len(username) > 30 {
		http.Error(response, "no or short/too long username", http.StatusBadRequest)
		return
	}

	password := request.FormValue("password")
	if len(password) < 8 {
		http.Error(response, "no or short passwords", http.StatusBadRequest)
		return
	}

	hashedPassword, err := passwords.PasswordHash(password)
	if err != nil {
		http.Error(response, "internal server error", http.StatusInternalServerError)
		return
	}

	newUser := &types.User{
		Name:         username,
		PasswordHash: hashedPassword,
		Color:        types.RandomRgba(),
		CreatedAt:    time.Now(),
	}

	ctx := request.Context()

	err = postgresql.UserSave(ctx, newUser)
	if err != nil {
		http.Error(response, "name taken", http.StatusConflict)
		return
	}

	response.WriteHeader(http.StatusCreated)
}

func HandleUserDelete(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, normal) {
		return
	}
	ctx := request.Context()

	userId, err := tokens.TokenValidateGetId(request.Header.Get("token"))
	if err != nil {
		http.Error(response, "invalid token", http.StatusUnauthorized)
		return
	}

	err = postgresql.UserDelete(ctx, userId)
	if err != nil {
		http.Error(response, "internal server error", http.StatusInternalServerError)
		return
	}

	cache.DeleteUser(userId)
	response.WriteHeader(http.StatusAccepted)
}

func HandleUserModProfile(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
	}

	updateList := &types.UserProfileUpdateList{}
	updatedValues := map[string]any{}

	if pronouns := request.FormValue("pronouns"); pronouns != "" {
		if len(pronouns) > 32 {
			http.Error(response, "pronouns too long", http.StatusBadRequest)
			return
		}
		user.Pronouns = pronouns
		updateList.Pronouns = true
		updatedValues["pronouns"] = pronouns
	}

	if description := request.FormValue("description"); description != "" {
		if len(description) > 256 {
			http.Error(response, "description too long", http.StatusBadRequest)
			return
		}
		user.Description = description
		updateList.Description = true
		updatedValues["description"] = description
	}

	if colorStr := request.FormValue("color"); colorStr != "" {
		color, err := convertions.StringToRgba(colorStr)
		if err != nil {
			http.Error(response, "invalid color", http.StatusBadRequest)
			return
		}
		user.Color = color
		updateList.Color = true
		updatedValues["color"] = color
	}

	if len(updatedValues) == 0 {
		http.Error(response, "no values", http.StatusBadRequest)
		return
	}

	err = postgresql.UserUpdateProfile(ctx, user, updateList)
	if err != nil {
		http.Error(response, "internal server error", http.StatusInternalServerError)
		return
	}
	user.Mu.RLock()
	connections := slices.Collect(maps.Values(user.Connections))
	user.Mu.RUnlock()

	for _, conn := range connections {
		target, err := getUserById(ctx, conn.GetSecondUser(user.Id))
		if err != nil {
			continue
		}
		wsServer.WsSendMessageCloseIfTimeout(target, types.WsEventMessage{
			Type: WsEventType.UserProfileChange,
			Event: &map[string]any{
				"userId":            user.Id,
				"profileChangeList": updatedValues,
			},
		})
	}

	response.WriteHeader(http.StatusAccepted)
}

func HandleUserGetUser(response http.ResponseWriter, request *http.Request) {
	if !validCheckWithResponseOnFail(response, request, normal) {
		return
	}
	ctx := request.Context()

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

	targetId, err := convertions.StringToUuid(request.URL.Query().Get("targetid"))
	if err != nil {
		http.Error(response, "invalid userid", http.StatusBadRequest)
		return
	}
	target, err := getUserById(ctx, targetId)
	if err != nil {
		http.Error(response, "user not found", http.StatusNotFound)
		return
	}

	userData, err := json.Marshal(target)
	if err != nil {
		http.Error(response, "json parse error", http.StatusInternalServerError)
		return
	}

	response.WriteHeader(http.StatusAccepted)
	response.Write(userData)
}