using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MTP_UManager
{
    static class Renderer 
    {
        public static void RenderNewPage()
        {
            Console.Clear();
            Console.WriteLine("[Университет]");
            Console.WriteLine();
        }

        public static string RenderMenu(string[] menuItems)
        {
            Console.WriteLine("Меню:");
            for (int i = 0; i < menuItems.Length; i++)
            {
                Console.WriteLine($"{i + 1}. {menuItems[i]}");
            }
            Console.WriteLine();
            Console.Write("Ввод: ");
            return Console.ReadLine();
        }

        // Login 
        public static void RenderLoginPageMessage()
        {
            RenderNewPage();

            Console.WriteLine("Введите данные для входа в приложение");
            Console.WriteLine();

            DataManipulator.Login();
        }

        // Login -> Main Menu
        public static void RenderMainPageMessage(Person user)
        {
            RenderNewPage();

            Console.WriteLine($"Добро пожаловать, {user.Username}");
            Console.WriteLine($"Ваш статус: {user.Status}");
            Console.WriteLine();
        }

        public static void RenderMainPage(Person user)
        {
            RenderMainPageMessage(user);

            DataManipulator.CheckUserChoiceInMainPageMenu(user, RenderMenu(DataGetter.GetMainPageMenuItems()));
        }

        public static void RenderLoginFailedError()
        {
            RenderNewPage();

            Console.WriteLine("Введённой вами комбинации логига и пароля не существует!");
            Console.WriteLine("Нажмите любую клавишу...");
            Console.ReadKey();

            RenderLoginPageMessage();
        }

        // Login -> Main Menu -> Courses List
        public static void RenderCoursesListPageMessage(Person user)
        {
            RenderNewPage();

            Console.WriteLine($"Список курсов для {user.Username}:");
            Console.WriteLine();

        }

        public static void RenderCoursesListPage (Student user)
        {
            RenderCoursesListPageMessage(user);

            foreach (string courseID in user.AvailableCoursesID)
            {
                GetCourseInfo(user, courseID);
            }

            DataManipulator.CheckUserChoiceInCoursesListPageMenu(user, RenderMenu(DataGetter.GetCoursesListPageMenuItems()));
        }

        public static void GetCourseInfo(Student user, string courseID) /**/
        {
            //TODO
            // Get this information from the database by the ID of course.
            string name = "None",
                description = "None",
                teacher = "None",
                status = "None";
            if (user.FinishedCoursesID.Contains(courseID))
                status = "Завершен";
            else if (user.TakenCoursesID.Contains(courseID))
                status = "Изучается";

            Console.WriteLine($"[{courseID}] {name}");
            Console.WriteLine($"---ОПИСАНИЕ: {description}");
            Console.WriteLine($"---ПРЕПОДАВАТЕЛЬ: {teacher}");
            Console.WriteLine($"---СТАТУС: {status}");
        }

        // Login -> Main Menu -> Courses List -> Sign Up For Course
        public static void RenderSignUpForCoursePageMessage(Student user)
        {
            RenderNewPage();

            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("Запись на учебный курс");
            Console.ForegroundColor = ConsoleColor.White;
            Console.WriteLine("Введите ID курса или return, чтобы вернуться назад");
            Console.Write("Ввод: ");

            string whatCourse = Console.ReadLine();
            RenderSignUpForCoursePage(user, whatCourse);
        }

        public static void RenderSignUpForCoursePage(Student user, string whatCourse)
        {
            List<string> coursesIDArray = user.AvailableCoursesID;
            bool doesCourseExist = false;
            // Does the user want to return or else does exist the course he choosed?
            if (whatCourse == "return")
            {
                RenderCoursesListPage(user);
                return;
            }
            else
                foreach (string courseID in coursesIDArray)
                    if (whatCourse == courseID)
                    {
                        doesCourseExist = true;
                        break;
                    }
            // Let's sign up for that course!
            if (doesCourseExist)
            {
                DataManipulator.SignUpForCourse(user, whatCourse);

                RenderCoursesListPageMessage(user);
            }
            else
            {
                RenderSignUpForCoursePageMessage(user);
            }
        }

        // Login -> Main Menu -> Courses List -> Leave Course
        public static void RenderLeaveCoursePageMessage(Student user)
        {
            RenderNewPage();

            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("Покинуть учебный курс");
            Console.ForegroundColor = ConsoleColor.White;
            Console.WriteLine("Введите ID курса или return, чтобі вернуться назад");
            Console.Write("Ввод: ");

            string whatCourse = Console.ReadLine();
            RenderLeaveCoursePage(user, whatCourse);
        }

        public static void RenderLeaveCoursePage(Student user, string whatCourse)
        {
            List<string> signedUpCoursesIDArray = user.TakenCoursesID;
            bool doesCourseExist = false;
            // Does the user want to return or else does exist the course he choosed?
            if (whatCourse == "return")
            {
                RenderCoursesListPage(user);
                return;
            }
            else
                foreach (string courseID in signedUpCoursesIDArray)
                    if (whatCourse == courseID)
                    {
                        doesCourseExist = true;
                        break;
                    }
            // Let's leave that course!
            if (doesCourseExist)
            {
                DataManipulator.LeaveCourse(user, whatCourse);
                RenderCoursesListPage(user);
            }
            else
            {
                RenderSignUpForCoursePageMessage(user);
            }
        }

        // Login -> Main Menu -> Courses Stats
        public static void RenderStudentStatsPageMessage(Student user)
        {
            RenderNewPage();

            Console.WriteLine($"Статистика студента {user.Username}");
            Console.WriteLine();
        }

        public static void RenderStudentStatsPage(Student user)
        {
            RenderStudentStatsPageMessage(user);

            Console.WriteLine($"|Курсов на изучении   |   {user.TakenCoursesID.Count}|");
            Console.WriteLine($"|Завершенных kурсов   |   {user.FinishedCoursesID.Count}|");

            DataManipulator.CheckUserChoiceInStudentStatsPageMenu(user, RenderMenu(DataGetter.GetStudentStatsPageMenuItems()));
        }
    }
}