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 ContentManagementEndpointTests
{
    [Fact]
    public async Task Tenant_content_management_requires_admin_authentication()
    {
        await using var factory = new ApiTestFactory();
        using var client = factory.CreateClient();

        using var response = await client.GetAsync("/api/tenant-content/entries");

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

    [Fact]
    public async Task Tenant_admin_can_upsert_entries_and_nodes()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedAdminAsync(factory);
        using var client = factory.CreateClient();
        await LoginAsync(client, seed);

        using var entryResponse = await client.PostAsJsonAsync(
            "/api/tenant-content/entries",
            new UpsertContentEntryDto
            {
                EntryKey = "exam-practice",
                Name = "刷题入口",
                EntryType = "questionPractice",
                Visibility = "members",
                Order = 10
            });
        var entryJson = await ReadJsonAsync(entryResponse);
        var entryId = entryJson.RootElement.GetProperty("item").GetProperty("id").GetGuid();

        using var nodeResponse = await client.PostAsJsonAsync(
            "/api/tenant-content/nodes",
            new UpsertContentNodeDto
            {
                EntryId = entryId,
                NodeKey = "chapter-1",
                Name = "第一章",
                NodeType = "chapter",
                IsLeaf = true
            });
        var nodeJson = await ReadJsonAsync(nodeResponse);
        using var listResponse = await client.GetAsync($"/api/tenant-content/nodes?entryId={entryId}&parentId=root");
        var listJson = await ReadJsonAsync(listResponse);

        Assert.Equal(HttpStatusCode.OK, entryResponse.StatusCode);
        Assert.Equal("exam-practice", entryJson.RootElement.GetProperty("item").GetProperty("entryKey").GetString());
        Assert.Equal(HttpStatusCode.OK, nodeResponse.StatusCode);
        var node = nodeJson.RootElement.GetProperty("item");
        Assert.Equal(0, node.GetProperty("depth").GetInt32());
        Assert.StartsWith("n_", node.GetProperty("path").GetString(), StringComparison.Ordinal);
        Assert.Single(listJson.RootElement.GetProperty("items").EnumerateArray());
    }

    [Fact]
    public async Task Tenant_admin_can_upsert_collection_replace_items_and_create_blueprint()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedAdminAsync(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 entryId = await CreateEntryAsync(client);
        var collectionResponse = await client.PostAsJsonAsync(
            "/api/tenant-content/question-collections",
            new UpsertQuestionCollectionDto
            {
                EntryId = entryId,
                Name = "基础题集",
                CollectionType = "manual",
                SourceType = "manualQuestions",
                TotalScore = 100,
                DurationMinutes = 45
            });
        var collectionJson = await ReadJsonAsync(collectionResponse);
        var collectionId = collectionJson.RootElement.GetProperty("item").GetProperty("id").GetGuid();

        var replaceResponse = await client.PostAsJsonAsync(
            "/api/tenant-content/question-collections/items/replace",
            new ReplaceCollectionItemsDto
            {
                CollectionId = collectionId,
                Questions =
                [
                    new CollectionQuestionDto
                    {
                        QuestionId = questionId,
                        SectionKey = "choice",
                        Order = 1,
                        Score = 5,
                        Required = true
                    }
                ]
            });
        var replaceJson = await ReadJsonAsync(replaceResponse);

        var blueprintResponse = await client.PostAsJsonAsync(
            "/api/tenant-content/practice-blueprints",
            new UpsertPracticeBlueprintDto
            {
                EntryId = entryId,
                CollectionId = collectionId,
                Name = "章节练习",
                Mode = "sequential",
                AssemblyType = "collection",
                QuestionLimit = 10,
                TotalScore = 100
            });
        var blueprintJson = await ReadJsonAsync(blueprintResponse);

        Assert.Equal(HttpStatusCode.OK, collectionResponse.StatusCode);
        Assert.Equal("Manual", collectionJson.RootElement.GetProperty("item").GetProperty("collectionType").GetString());
        Assert.Equal(HttpStatusCode.OK, replaceResponse.StatusCode);
        Assert.Equal(1, replaceJson.RootElement.GetProperty("questionCount").GetInt32());
        Assert.Equal(HttpStatusCode.OK, blueprintResponse.StatusCode);
        Assert.Equal(collectionId, blueprintJson.RootElement.GetProperty("item").GetProperty("collectionId").GetGuid());

        using var scope = factory.Services.CreateScope();
        var dbContext = scope.ServiceProvider.GetRequiredService<TikuDbContext>();
        Assert.Equal(1, dbContext.QuestionCollections.Single(item => item.Id == collectionId).QuestionCount);
        Assert.Contains(dbContext.QuestionCollectionItems, item => item.QuestionId == questionId);
    }

    [Fact]
    public async Task Tenant_admin_can_get_import_field_mapping_and_templates()
    {
        await using var factory = new ApiTestFactory();
        var seed = await SeedAdminAsync(factory);
        using var client = factory.CreateClient();
        await LoginAsync(client, seed);

        using var mappingResponse = await client.GetAsync("/api/tenant-content/imports/field-mapping?importType=questions");
        using var templateResponse = await client.GetAsync("/api/tenant-content/imports/templates?importType=questions&format=csv");
        var mapping = await ReadJsonAsync(mappingResponse);
        var template = await ReadJsonAsync(templateResponse);

        Assert.Equal(HttpStatusCode.OK, mappingResponse.StatusCode);
        Assert.Equal("questions", mapping.RootElement.GetProperty("importType").GetString());
        Assert.Contains(mapping.RootElement.GetProperty("requiredFields").EnumerateArray(), item => item.GetString() == "type");
        Assert.Equal(HttpStatusCode.OK, templateResponse.StatusCode);
        Assert.Equal("csv", template.RootElement.GetProperty("format").GetString());
        Assert.NotEmpty(template.RootElement.GetProperty("contentBase64").GetString() ?? string.Empty);
    }

    private static async Task<Guid> CreateEntryAsync(HttpClient client)
    {
        using var response = await client.PostAsJsonAsync(
            "/api/tenant-content/entries",
            new UpsertContentEntryDto
            {
                EntryKey = Guid.NewGuid().ToString("N"),
                Name = "刷题入口",
                EntryType = "questionPractice"
            });
        var json = await ReadJsonAsync(response);
        return json.RootElement.GetProperty("item").GetProperty("id").GetGuid();
    }

    private static async Task<(Guid TenantId, Guid UserId, string Phone)> SeedAdminAsync(ApiTestFactory factory)
    {
        var tenantId = Guid.NewGuid();
        var userId = Guid.NewGuid();
        var phone = "13700000000";
        var passwordHash = new PasswordHasher().Hash("passw0rd!");

        await factory.SeedAsync(
            new Tenant
            {
                Id = tenantId,
                Slug = tenantId.ToString("N"),
                Name = "Test Tenant",
                Status = TenantStatus.Active,
                Metadata = JsonDefaults.Object()
            },
            new User
            {
                Id = userId,
                Phone = phone,
                Name = "Tenant Admin"
            },
            new TenantMembership
            {
                TenantId = tenantId,
                UserId = userId,
                Role = TenantRole.TenantAdmin,
                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 JsonElement CreateSecretPayload(string passwordHash)
    {
        using var document = JsonDocument.Parse(
            $$"""{"passwordHash":{{JsonSerializer.Serialize(passwordHash)}}}""");
        return document.RootElement.Clone();
    }
}