using GermanApp.Application.DTOs;
using GermanApp.Application.Services;
using GermanApp.Domain.Entities;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace GermanApp.Presentation.Controllers;

/// <summary>
/// API controller for managing quizzes.
/// This is part of the Presentation layer.
/// </summary>
[ApiController]
[Route("api/[controller]")]
[Authorize]
public class QuizzesController : ControllerBase
{
    private readonly QuizService _quizService;
    private readonly QuizQuestionService _quizQuestionService;

    public QuizzesController(
        QuizService quizService,
        QuizQuestionService quizQuestionService)
    {
        _quizService = quizService;
        _quizQuestionService = quizQuestionService;
    }

    /// <summary>
    /// Gets all quizzes.
    /// </summary>
    /// <returns>List of all quizzes</returns>
    [HttpGet]
    public async Task<IActionResult> GetAllQuizzesAsync(CancellationToken cancellationToken = default)
    {
        var quizzes = await _quizService.GetAllQuizzesAsync(cancellationToken);
        return Ok(quizzes);
    }

    /// <summary>
    /// Gets all quizzes as list items (summary).
    /// </summary>
    /// <returns>List of quiz summary items</returns>
    [HttpGet("list")]
    public async Task<IActionResult> GetAllQuizListItemsAsync(CancellationToken cancellationToken = default)
    {
        var quizzes = await _quizService.GetAllQuizListItemsAsync(cancellationToken);
        return Ok(quizzes);
    }

    /// <summary>
    /// Gets a specific quiz by its ID.
    /// </summary>
    /// <param name="id">The quiz ID</param>
    /// <returns>The quiz with the specified ID</returns>
    [HttpGet("{id}")]
    public async Task<IActionResult> GetQuizByIdAsync(int id, CancellationToken cancellationToken = default)
    {
        var quiz = await _quizService.GetQuizByIdAsync(id, cancellationToken);
        if (quiz == null)
            return NotFound();
        return Ok(quiz);
    }

    /// <summary>
    /// Gets a quiz with its questions by ID.
    /// </summary>
    /// <param name="id">The quiz ID</param>
    /// <returns>The quiz with questions</returns>
    [HttpGet("{id}/with-questions")]
    public async Task<IActionResult> GetQuizWithQuestionsAsync(int id, CancellationToken cancellationToken = default)
    {
        var quiz = await _quizService.GetQuizWithQuestionsAsync(id, cancellationToken);
        if (quiz == null)
            return NotFound();
        return Ok(quiz);
    }

    /// <summary>
    /// Gets all quizzes for a specific lesson.
    /// </summary>
    /// <param name="lessonId">The lesson ID</param>
    /// <returns>List of quizzes for the specified lesson</returns>
    [HttpGet("by-lesson/{lessonId}")]
    public async Task<IActionResult> GetQuizzesByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        var quizzes = await _quizService.GetQuizzesByLessonAsync(lessonId, cancellationToken);
        return Ok(quizzes);
    }

    /// <summary>
    /// Gets active quizzes for a specific lesson.
    /// </summary>
    /// <param name="lessonId">The lesson ID</param>
    /// <returns>List of active quizzes for the specified lesson</returns>
    [HttpGet("active/by-lesson/{lessonId}")]
    public async Task<IActionResult> GetActiveQuizzesByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        var quizzes = await _quizService.GetActiveQuizzesByLessonAsync(lessonId, cancellationToken);
        return Ok(quizzes);
    }

    /// <summary>
    /// Gets the first quiz for a lesson.
    /// </summary>
    /// <param name="lessonId">The lesson ID</param>
    /// <returns>The first quiz for the lesson</returns>
    [HttpGet("first/by-lesson/{lessonId}")]
    public async Task<IActionResult> GetFirstQuizByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        var quiz = await _quizService.GetFirstQuizByLessonAsync(lessonId, cancellationToken);
        if (quiz == null)
            return NotFound();
        return Ok(quiz);
    }

    /// <summary>
    /// Gets all active quizzes.
    /// </summary>
    /// <returns>List of active quizzes</returns>
    [HttpGet("active")]
    public async Task<IActionResult> GetActiveQuizzesAsync(CancellationToken cancellationToken = default)
    {
        var quizzes = await _quizService.GetActiveQuizzesAsync(cancellationToken);
        return Ok(quizzes);
    }

    /// <summary>
    /// Creates a new quiz.
    /// </summary>
    /// <param name="dto">The quiz data</param>
    /// <returns>The created quiz</returns>
    [HttpPost]
    [Authorize(Roles = "Admin")]
    public async Task<IActionResult> CreateQuizAsync(CreateQuizDto dto, CancellationToken cancellationToken = default)
    {
        var quiz = await _quizService.CreateQuizAsync(dto, cancellationToken);
        return CreatedAtAction(nameof(GetQuizByIdAsync), new { id = quiz.Id }, quiz);
    }

    /// <summary>
    /// Updates an existing quiz.
    /// </summary>
    /// <param name="id">The quiz ID</param>
    /// <param name="dto">The updated quiz data</param>
    /// <returns>The updated quiz</returns>
    [HttpPut("{id}")]
    [Authorize(Roles = "Admin")]
    public async Task<IActionResult> UpdateQuizAsync(int id, UpdateQuizDto dto, CancellationToken cancellationToken = default)
    {
        var quiz = await _quizService.UpdateQuizAsync(id, dto, cancellationToken);
        if (quiz == null)
            return NotFound();
        return Ok(quiz);
    }

    /// <summary>
    /// Deletes a quiz by its ID.
    /// </summary>
    /// <param name="id">The quiz ID</param>
    /// <returns>No content on success</returns>
    [HttpDelete("{id}")]
    [Authorize(Roles = "Admin")]
    public async Task<IActionResult> DeleteQuizAsync(int id, CancellationToken cancellationToken = default)
    {
        var result = await _quizService.DeleteQuizAsync(id, cancellationToken);
        if (!result)
            return NotFound();
        return NoContent();
    }

    /// <summary>
    /// Activates a quiz.
    /// </summary>
    /// <param name="id">The quiz ID</param>
    /// <returns>The activated quiz</returns>
    [HttpPost("{id}/activate")]
    [Authorize(Roles = "Admin")]
    public async Task<IActionResult> ActivateQuizAsync(int id, CancellationToken cancellationToken = default)
    {
        var quiz = await _quizService.ActivateQuizAsync(id, cancellationToken);
        if (quiz == null)
            return NotFound();
        return Ok(quiz);
    }

    /// <summary>
    /// Deactivates a quiz.
    /// </summary>
    /// <param name="id">The quiz ID</param>
    /// <returns>The deactivated quiz</returns>
    [HttpPost("{id}/deactivate")]
    [Authorize(Roles = "Admin")]
    public async Task<IActionResult> DeactivateQuizAsync(int id, CancellationToken cancellationToken = default)
    {
        var quiz = await _quizService.DeactivateQuizAsync(id, cancellationToken);
        if (quiz == null)
            return NotFound();
        return Ok(quiz);
    }

    /// <summary>
    /// Checks if a quiz exists by ID.
    /// </summary>
    /// <param name="id">The quiz ID</param>
    /// <returns>True if the quiz exists</returns>
    [HttpGet("exists/{id}")]
    public async Task<IActionResult> ExistsAsync(int id, CancellationToken cancellationToken = default)
    {
        var exists = await _quizService.ExistsAsync(id, cancellationToken);
        return Ok(new { exists });
    }

    /// <summary>
    /// Checks if a quiz exists for a lesson.
    /// </summary>
    /// <param name="lessonId">The lesson ID</param>
    /// <returns>True if a quiz exists for the lesson</returns>
    [HttpGet("exists/by-lesson/{lessonId}")]
    public async Task<IActionResult> ExistsByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        var exists = await _quizService.ExistsByLessonAsync(lessonId, cancellationToken);
        return Ok(new { lessonId, exists });
    }

    /// <summary>
    /// Gets the total number of quizzes.
    /// </summary>
    /// <returns>The total count of quizzes</returns>
    [HttpGet("count")]
    public async Task<IActionResult> GetTotalQuizCountAsync(CancellationToken cancellationToken = default)
    {
        var count = await _quizService.GetTotalQuizCountAsync(cancellationToken);
        return Ok(new { count });
    }

    /// <summary>
    /// Gets the number of quizzes for a lesson.
    /// </summary>
    /// <param name="lessonId">The lesson ID</param>
    /// <returns>The count of quizzes for the lesson</returns>
    [HttpGet("count/by-lesson/{lessonId}")]
    public async Task<IActionResult> GetQuizCountByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        var count = await _quizService.GetQuizCountByLessonAsync(lessonId, cancellationToken);
        return Ok(new { lessonId, count });
    }

    /// <summary>
    /// Gets quizzes by passing score range.
    /// </summary>
    /// <param name="minScore">Minimum passing score</param>
    /// <param name="maxScore">Maximum passing score</param>
    /// <returns>List of quizzes in the score range</returns>
    [HttpGet("by-passing-score/{minScore}/{maxScore}")]
    public async Task<IActionResult> GetQuizzesByPassingScoreRangeAsync(int minScore, int maxScore, CancellationToken cancellationToken = default)
    {
        var quizzes = await _quizService.GetQuizzesByPassingScoreRangeAsync(minScore, maxScore, cancellationToken);
        return Ok(quizzes);
    }

    /// <summary>
    /// Gets quiz questions for a specific quiz.
    /// </summary>
    /// <param name="quizId">The quiz ID</param>
    /// <returns>List of quiz questions for the quiz</returns>
    [HttpGet("{quizId}/questions")]
    public async Task<IActionResult> GetQuizQuestionsByQuizAsync(int quizId, CancellationToken cancellationToken = default)
    {
        var questions = await _quizQuestionService.GetQuizQuestionsByQuizAsync(quizId, cancellationToken);
        return Ok(questions);
    }

    /// <summary>
    /// Gets active quiz questions for a specific quiz.
    /// </summary>
    /// <param name="quizId">The quiz ID</param>
    /// <returns>List of active quiz questions for the quiz</returns>
    [HttpGet("{quizId}/questions/active")]
    public async Task<IActionResult> GetActiveQuizQuestionsByQuizAsync(int quizId, CancellationToken cancellationToken = default)
    {
        var questions = await _quizQuestionService.GetActiveQuizQuestionsByQuizAsync(quizId, cancellationToken);
        return Ok(questions);
    }

    /// <summary>
    /// Gets random quiz questions for a quiz.
    /// </summary>
    /// <param name="quizId">The quiz ID</param>
    /// <param name="count">Number of questions to return</param>
    /// <returns>List of random quiz questions</returns>
    [HttpGet("{quizId}/questions/random/{count}")]
    public async Task<IActionResult> GetRandomQuizQuestionsForQuizAsync(int quizId, int count, CancellationToken cancellationToken = default)
    {
        var questions = await _quizQuestionService.GetRandomQuizQuestionsForQuizAsync(quizId, count, cancellationToken);
        return Ok(questions);
    }

    /// <summary>
    /// Submits quiz answers and returns the result.
    /// </summary>
    /// <param name="userId">The user ID</param>
    /// <param name="quizId">The quiz ID</param>
    /// <param name="dto">The quiz answers submission</param>
    /// <returns>The quiz result</returns>
    [HttpPost("submit/{userId}/{quizId}")]
    [Authorize]
    public async Task<IActionResult> SubmitQuizAnswersAsync(int userId, int quizId, SubmitQuizDto dto, CancellationToken cancellationToken = default)
    {
        // Update the submission to use the correct quizId
        var submission = new SubmitQuizDto(quizId, dto.Answers);
        var result = await _quizQuestionService.SubmitQuizAnswersForQuizAsync(userId, submission, cancellationToken);
        return Ok(result);
    }

    /// <summary>
    /// Gets the total points for a quiz.
    /// </summary>
    /// <param name="quizId">The quiz ID</param>
    /// <returns>The total points for the quiz</returns>
    [HttpGet("{quizId}/total-points")]
    public async Task<IActionResult> GetTotalPointsForQuizAsync(int quizId, CancellationToken cancellationToken = default)
    {
        var points = await _quizQuestionService.GetTotalPointsForQuizAsync(quizId, cancellationToken);
        return Ok(new { quizId, points });
    }
}