package file

import (
	"fmt"
	"os"
	"reflect"
	"testing"

	"git.andreafazzi.eu/andrea/probo/client"
	"git.andreafazzi.eu/andrea/probo/hasher/sha256"
	"git.andreafazzi.eu/andrea/probo/models"
	"git.andreafazzi.eu/andrea/probo/store/memory"
	"github.com/remogatto/prettytest"
)

type testSuite struct {
	prettytest.Suite
}

func TestRunner(t *testing.T) {
	prettytest.Run(
		t,
		new(testSuite),
	)
}

func (t *testSuite) TestQuizFromMarkdown() {
	markdown := `Question text (1).

Question text (2).

Question text (3).

* Answer 1
* Answer 2
* Answer 3
* Answer 4`

	expectedQuiz := &client.Quiz{
		Question: &client.Question{Text: "Question text (1).\n\nQuestion text (2).\n\nQuestion text (3)."},
		Answers: []*client.Answer{
			{Text: "Answer 1", Correct: true},
			{Text: "Answer 2", Correct: false},
			{Text: "Answer 3", Correct: false},
			{Text: "Answer 4", Correct: false},
		},
	}

	quiz, err := QuizFromMarkdown(markdown)
	t.Nil(err, fmt.Sprintf("Quiz should be parsed without errors: %v", err))

	if !t.Failed() {
		t.True(reflect.DeepEqual(quiz, expectedQuiz), fmt.Sprintf("Expected %+v, got %+v", expectedQuiz, quiz))
	}
}

func (t *testSuite) TestReadAllQuizzes() {
	store, err := NewFileProboCollectorStore("./testdata/quizzes")
	t.True(err == nil, fmt.Sprintf("A file store should be initialized without problems but an error occurred: %v", err))

	if !t.Failed() {
		result, err := store.ReadAllQuizzes()

		t.True(err == nil, fmt.Sprintf("Quizzes should be returned without errors: %v", err))

		if !t.Failed() {
			t.Equal(
				2,
				len(result),
				fmt.Sprintf("The store contains 3 files but only 2 should be parsed (duplicated quiz). Total of parsed quizzes are instead %v", len(result)),
			)
		}
	}

}

func (t *testSuite) TestMarkdownFromQuiz() {
	store := memory.NewMemoryProboCollectorStore(sha256.NewDefault256Hasher(sha256.DefaultSHA256HashingFn))
	quiz, err := store.CreateQuiz(
		&client.CreateUpdateQuizRequest{
			Quiz: &client.Quiz{
				Question: &client.Question{Text: "Newly created question text."},
				Answers: []*client.Answer{
					{Text: "Answer 1", Correct: true},
					{Text: "Answer 2", Correct: false},
					{Text: "Answer 3", Correct: false},
					{Text: "Answer 4", Correct: false},
				},
			},
		})
	md, err := MarkdownFromQuiz(quiz)
	t.Nil(err, "Conversion to markdown should not raise an error")
	if !t.Failed() {
		t.Equal(`Newly created question text.

* Answer 1
* Answer 2
* Answer 3
* Answer 4
`, md)
	}
}

func (t *testSuite) TestCreateQuiz() {
	dirname := "./testdata/quizzes"
	store, err := NewFileProboCollectorStore(dirname)

	t.True(err == nil, fmt.Sprintf("A file store should be initialized without problems but an error occurred: %v", err))

	if !t.Failed() {
		clientQuiz := &client.Quiz{
			Question: &client.Question{Text: "Newly created question text."},
			Answers: []*client.Answer{
				{Text: "Answer 1", Correct: true},
				{Text: "Answer 2", Correct: false},
				{Text: "Answer 3", Correct: false},
				{Text: "Answer 4", Correct: false},
			},
		}
		quiz, err := store.CreateQuiz(
			&client.CreateUpdateQuizRequest{
				Quiz: clientQuiz,
			},
		)

		t.Nil(err, fmt.Sprintf("An error was raised when saving the quiz on disk: %v", err))

		if !t.Failed() {
			path, err := store.GetPath(quiz)
			t.Nil(err, "GetPath should not raise an error.")

			if !t.Failed() {
				exists, err := os.Stat(path)
				t.Nil(err, "Stat should not return an error")

				if !t.Failed() {
					t.True(exists != nil, "The new quiz file was not created.")
					if !t.Failed() {
						quizFromDisk, err := readQuizFromDisk(path)
						t.Nil(err, "Quiz should be read from disk without errors.")
						if !t.Failed() {
							t.True(reflect.DeepEqual(quizFromDisk, clientQuiz), "Quiz read from disk and stored in memory should be equal.")
							err := os.Remove(path)
							t.Nil(err, "Test file should be removed without errors.")
						}
					}
				}
			}
		}
	}
}

func (t *testSuite) TestUpdateQuiz() {
	dirname := "./testdata/quizzes"
	store, err := NewFileProboCollectorStore(dirname)
	t.True(err == nil, fmt.Sprintf("A file store should be initialized without problems but an error occurred: %v", err))

	if !t.Failed() {
		quiz, err := createQuizOnDisk(store, &client.CreateUpdateQuizRequest{
			Quiz: &client.Quiz{
				Question: &client.Question{Text: "Newly created question text."},
				Answers: []*client.Answer{
					{Text: "Answer 1", Correct: true},
					{Text: "Answer 2", Correct: false},
					{Text: "Answer 3", Correct: false},
					{Text: "Answer 4", Correct: false},
				},
			},
		})

		t.Nil(err, "The quiz to be updated should be created without issue")

		if !t.Failed() {
			clientQuiz := &client.Quiz{
				Question: &client.Question{Text: "Newly created question text."},
				Answers: []*client.Answer{
					{Text: "Answer 1", Correct: true},
					{Text: "Answer 2", Correct: false},
					{Text: "Answer 3", Correct: false},
					{Text: "Answer 4", Correct: false},
				},
			}

			updatedQuiz, err := store.UpdateQuiz(
				&client.CreateUpdateQuizRequest{
					Quiz: clientQuiz,
				}, quiz.ID)

			t.Nil(err, fmt.Sprintf("Quiz should be updated without errors: %v", err))

			if !t.Failed() {
				path, err := store.GetPath(updatedQuiz)

				if !t.Failed() {
					t.Nil(err, "GetPath should not raise an error.")

					if !t.Failed() {
						quizFromDisk, err := readQuizFromDisk(path)
						t.Nil(err, "Quiz should be read from disk without errors.")
						if !t.Failed() {
							t.True(reflect.DeepEqual(clientQuiz, quizFromDisk), "Quiz should be updated.")
							err := os.Remove(path)
							t.Nil(err, "Stat should not return an error")
						}
					}
				}
			}
		}
	}

}

func createQuizOnDisk(store *FileProboCollectorStore, req *client.CreateUpdateQuizRequest) (*models.Quiz, error) {
	return store.CreateQuiz(req)

}

func readQuizFromDisk(path string) (*client.Quiz, error) {
	content, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}
	return QuizFromMarkdown(string(content))
}

func testsAreEqual(got, want []*models.Quiz) bool {
	return reflect.DeepEqual(got, want)
}