using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using Microsoft.Extensions.DependencyInjection;
using Tiku.Api.Contracts;
using Tiku.Domain.Common;
using Tiku.Domain.Content;
using Tiku.Domain.Identity;
using Tiku.Domain.QuestionBanks;
using Tiku.Domain.Tenancy;
using Tiku.Infrastructure.Auth;
using Tiku.Infrastructure.Persistence;

namespace Tiku.IntegrationTests.Api;

public sealed class LearningEndpointTests
{
    [Fact]
    public async Task Learning_endpoints_require_current_tenant_member()
    {
        await using var factory = new ApiTestFactory();
        using var client = factory.CreateClient();

        using var response = await client.GetAsync("/api/learning/favorites/questions");

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
    }

    [Fact]
    public async Task Submit_answer_records_wrong_question_when_self_judged_wrong()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedLearningUserAsync(factory);
        var questionId = Guid.NewGuid();
        await factory.SeedAsync(new Question
        {
            Id = questionId,
            TenantId = seed.TenantId,
            Type = "choice",
            Status = QuestionStatus.Published
        });
        using var client = factory.CreateClient();
        await LoginAsync(client, seed);

        using var response = await client.PostAsJsonAsync(
            "/api/learning/answers",
            new SubmitAnswerDto
            {
                QuestionId = questionId,
                SelectedOptions = ["A"],
                SelfJudgedCorrect = false
            });
        using var wrongResponse = await client.GetAsync("/api/learning/wrong-questions");
        var answer = await ReadJsonAsync(response);
        var wrongItems = await ReadItemsAsync(wrongResponse);

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        Assert.Equal(questionId, answer.RootElement.GetProperty("questionId").GetGuid());
        Assert.False(answer.RootElement.GetProperty("isCorrect").GetBoolean());
        var wrong = Assert.Single(wrongItems);
        Assert.Equal(questionId, wrong.GetProperty("questionId").GetGuid());
        Assert.Equal(1, wrong.GetProperty("wrongCount").GetInt32());
    }

    [Fact]
    public async Task Favorite_question_can_be_added_listed_and_removed()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedLearningUserAsync(factory);
        var questionId = Guid.NewGuid();
        await factory.SeedAsync(new Question
        {
            Id = questionId,
            TenantId = seed.TenantId,
            Type = "choice",
            Status = QuestionStatus.Published
        });
        using var client = factory.CreateClient();
        await LoginAsync(client, seed);

        var addResponse = await client.PostAsJsonAsync(
            "/api/learning/favorites/questions",
            new QuestionActionDto { QuestionId = questionId });
        var listResponse = await client.GetAsync("/api/learning/favorites/questions");
        var itemsAfterAdd = await ReadItemsAsync(listResponse);
        var removeResponse = await client.PostAsJsonAsync(
            "/api/learning/favorites/questions",
            new QuestionActionDto { QuestionId = questionId, Favorite = false });
        var emptyResponse = await client.GetAsync("/api/learning/favorites/questions");
        var itemsAfterRemove = await ReadItemsAsync(emptyResponse);

        Assert.Equal(HttpStatusCode.OK, addResponse.StatusCode);
        Assert.Equal(HttpStatusCode.OK, listResponse.StatusCode);
        Assert.Equal(questionId, Assert.Single(itemsAfterAdd).GetProperty("questionId").GetGuid());
        Assert.Equal(HttpStatusCode.OK, removeResponse.StatusCode);
        Assert.Empty(itemsAfterRemove);
    }

    [Fact]
    public async Task Word_progress_upserts_and_filters_by_status()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedLearningUserAsync(factory);
        var wordId = Guid.NewGuid();
        await factory.SeedAsync(new VocabularyWord
        {
            Id = wordId,
            TenantId = seed.TenantId,
            Word = "composition",
            IsActive = true
        });
        using var client = factory.CreateClient();
        await LoginAsync(client, seed);

        using var updateResponse = await client.PostAsJsonAsync(
            "/api/learning/vocabulary/progress",
            new WordProgressDto
            {
                WordId = wordId,
                Status = "learning",
                CorrectDelta = 2
            });
        using var listResponse = await client.GetAsync("/api/learning/vocabulary/progress?status=learning");
        var progress = await ReadJsonAsync(updateResponse);
        var items = await ReadItemsAsync(listResponse);

        Assert.Equal(HttpStatusCode.OK, updateResponse.StatusCode);
        Assert.Equal(2, progress.RootElement.GetProperty("correctCount").GetInt32());
        var item = Assert.Single(items);
        Assert.Equal(wordId, item.GetProperty("wordId").GetGuid());
        Assert.Equal("Learning", item.GetProperty("status").GetString());
    }

    [Fact]
    public async Task Favorite_words_can_be_filtered_by_unit()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedLearningUserAsync(factory);
        var unitId = Guid.NewGuid();
        var otherUnitId = Guid.NewGuid();
        var wordId = Guid.NewGuid();
        var otherWordId = Guid.NewGuid();
        await factory.SeedAsync(
            new VocabularyUnit
            {
                Id = unitId,
                TenantId = seed.TenantId,
                Name = "Unit 1",
                IsActive = true
            },
            new VocabularyUnit
            {
                Id = otherUnitId,
                TenantId = seed.TenantId,
                Name = "Unit 2",
                IsActive = true
            },
            new VocabularyWord
            {
                Id = wordId,
                TenantId = seed.TenantId,
                UnitId = unitId,
                Word = "design",
                IsActive = true
            },
            new VocabularyWord
            {
                Id = otherWordId,
                TenantId = seed.TenantId,
                UnitId = otherUnitId,
                Word = "sketch",
                IsActive = true
            });
        using var client = factory.CreateClient();
        await LoginAsync(client, seed);

        await client.PostAsJsonAsync(
            "/api/learning/vocabulary/favorites",
            new FavoriteWordDto { WordId = wordId, Note = "重点" });
        await client.PostAsJsonAsync(
            "/api/learning/vocabulary/favorites",
            new FavoriteWordDto { WordId = otherWordId });
        using var response = await client.GetAsync($"/api/learning/vocabulary/favorites?unitId={unitId}");
        var items = await ReadItemsAsync(response);

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        var item = Assert.Single(items);
        Assert.Equal(wordId, item.GetProperty("wordId").GetGuid());
        Assert.Equal("重点", item.GetProperty("note").GetString());
    }

    private static async Task<(Guid TenantId, Guid UserId, string Phone)> SeedLearningUserAsync(
        ApiTestFactory factory)
    {
        var tenantId = Guid.NewGuid();
        var userId = Guid.NewGuid();
        var phone = "13900000000";
        var passwordHash = new PasswordHasher().Hash("passw0rd!");

        await factory.SeedAsync(
            new Tenant
            {
                Id = tenantId,
                Slug = tenantId.ToString("N"),
                Name = "Learning Tenant"
            },
            new User
            {
                Id = userId,
                Phone = phone,
                Name = "Learning User"
            },
            new TenantMembership
            {
                TenantId = tenantId,
                UserId = userId,
                Role = TenantRole.Student,
                Status = MembershipStatus.Active
            },
            new UserIdentity
            {
                UserId = userId,
                Provider = "password",
                ProviderSubject = phone,
                Phone = phone,
                SecretPayload = CreateSecretPayload(passwordHash)
            });

        return (tenantId, userId, phone);
    }

    private static async Task LoginAsync(
        HttpClient client,
        (Guid TenantId, Guid UserId, string Phone) seed)
    {
        var loginResponse = await client.PostAsJsonAsync(
            "/api/auth/login/password",
            new PasswordLoginDto
            {
                TenantId = seed.TenantId,
                Phone = seed.Phone,
                Password = "passw0rd!"
            });
        var loginJson = await ReadJsonAsync(loginResponse);
        var accessToken = loginJson.RootElement
            .GetProperty("tokens")
            .GetProperty("accessToken")
            .GetString();
        client.DefaultRequestHeaders.Authorization = new("Bearer", accessToken);
    }

    private static async Task<JsonDocument> ReadJsonAsync(HttpResponseMessage response)
    {
        var stream = await response.Content.ReadAsStreamAsync();
        return await JsonDocument.ParseAsync(stream);
    }

    private static async Task<JsonElement[]> ReadItemsAsync(HttpResponseMessage response)
    {
        var body = await ReadJsonAsync(response);
        return body.RootElement
            .GetProperty("items")
            .EnumerateArray()
            .Select(item => item.Clone())
            .ToArray();
    }

    private static JsonElement CreateSecretPayload(string passwordHash)
    {
        using var document = JsonDocument.Parse(
            $$"""{"passwordHash":{{JsonSerializer.Serialize(passwordHash)}}}""");
        return document.RootElement.Clone();
    }
}