package users

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"reflect"
	"strings"
	"time"

	"fr.latosa-escrima/core"
	"fr.latosa-escrima/core/models"
)

type UpdateUserArgs struct {
	FirstName  *string                `json:"firstname,omitempty"`
	LastName   *string                `json:"lastname,omitempty"`
	Email      *string                `json:"email,omitempty"`
	Password   *string                `json:"password,omitempty"`
	Phone      *string                `json:"phone,omitempty"`
	Attributes *models.UserAttributes `json:"attributes"`
}

func HandleUpdate(w http.ResponseWriter, r *http.Request) {
	var updateArgs UpdateUserArgs
	err := json.NewDecoder(r.Body).Decode(&updateArgs)
	if err != nil {
		core.JSONError{
			Status:  core.Error,
			Message: err.Error(),
		}.Respond(w, http.StatusInternalServerError)
		return
	}

	var user models.User
	updateQuery := core.DB.NewUpdate().Model(&user)

	val := reflect.ValueOf(updateArgs)
	typ := reflect.TypeOf(updateArgs)

	for i := 0; i < val.NumField(); i++ {
		field := val.Field(i)
		fieldname := typ.Field(i).Name

		tag := typ.Field(i).Tag.Get("bun")
		if tag == "" {
			tag = typ.Field(i).Tag.Get("json")
		}

		// Only add fields that are non-nil and non-zero
		if field.IsValid() && !field.IsNil() && !field.IsZero() {
			if fieldname == "Password" {
				updateQuery.Set(fmt.Sprintf("%s = crypt(?, gen_salt('bf'))", strings.Split(tag, ",")[0]), field.Interface())
			} else {
				updateQuery.Set(fmt.Sprintf("%s = ?", strings.Split(tag, ",")[0]), field.Interface())
			}
		}
	}

	// Always update the `updated_at` field
	updateQuery.Set("updated_at = ?", time.Now())

	uuid := r.PathValue("user_uuid")
	_, err = updateQuery.
		Where("user_id = ?", uuid).
		Returning("*").
		Exec(context.Background())

	if err != nil {
		core.JSONError{
			Status:  core.Error,
			Message: err.Error(),
		}.Respond(w, http.StatusInternalServerError)
		return
	}

	user.Password = ""

	core.JSONSuccess{
		Status:  core.Success,
		Message: "User updated.",
		Data:    user,
	}.Respond(w, http.StatusOK)
}