using System.Net;
using System.Net.Http.Json;
using Microsoft.EntityFrameworkCore;

namespace WordVersioning.Api.IntegrationTests;

/// <summary>FR-13 — commit message ต่อ version: รับจากทุก flow ที่สร้าง version (upload + generate),
/// normalize ว่าง/whitespace → null, trim, จำกัด 2048 อักขระ, echo ใน history (AC-16)</summary>
[Collection(IntegrationTestCollection.Name)]
public sealed class VersionMessageTests(IntegrationTestFixture fixture)
{
    [Fact]
    public async Task Upload_WithMessage_PersistsRow_AndEchoesInHistory()
    {
        var documentId = Guid.NewGuid();
        using var client = fixture.CreateClient();

        using var response = await client.PostAsync(
            $"api/documents/{documentId}/versions",
            ApiExtensions.VersionForm(
                TestDocx.BuildPlainDocx(), "doc.docx", Guid.NewGuid().ToString(),
                message: "แก้ไขข้อ 3 หลังตรวจสอบ"));

        Assert.Equal(HttpStatusCode.Created, response.StatusCode);

        await using var db = fixture.CreateDb();
        var version = await db.DocumentVersions.AsNoTracking().SingleAsync(v => v.DocumentId == documentId);
        Assert.Equal("แก้ไขข้อ 3 หลังตรวจสอบ", version.Message);

        using var history = await client.GetAsync($"api/documents/{documentId}/versions");
        var items = await history.Content.ReadFromJsonAsync<List<VersionItem>>(IntegrationTestFixture.Json);
        Assert.Equal("แก้ไขข้อ 3 หลังตรวจสอบ", items!.Single().Message);
    }

    /// <summary>ไม่ส่ง / ส่งค่าว่าง / ส่ง whitespace ล้วน → เก็บ null ทั้ง DB และ history</summary>
    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public async Task Upload_BlankOrMissingMessage_StoredAsNull(string? sent)
    {
        var documentId = Guid.NewGuid();
        using var client = fixture.CreateClient();

        using var response = await client.PostAsync(
            $"api/documents/{documentId}/versions",
            ApiExtensions.VersionForm(
                TestDocx.BuildPlainDocx(), "doc.docx", Guid.NewGuid().ToString(),
                message: sent));

        Assert.Equal(HttpStatusCode.Created, response.StatusCode);

        await using var db = fixture.CreateDb();
        var version = await db.DocumentVersions.AsNoTracking().SingleAsync(v => v.DocumentId == documentId);
        Assert.Null(version.Message);

        using var history = await client.GetAsync($"api/documents/{documentId}/versions");
        var items = await history.Content.ReadFromJsonAsync<List<VersionItem>>(IntegrationTestFixture.Json);
        Assert.Null(items!.Single().Message);
    }

    [Fact]
    public async Task Upload_TrimsSurroundingWhitespace()
    {
        var documentId = Guid.NewGuid();
        using var client = fixture.CreateClient();

        using var response = await client.PostAsync(
            $"api/documents/{documentId}/versions",
            ApiExtensions.VersionForm(
                TestDocx.BuildPlainDocx(), "doc.docx", Guid.NewGuid().ToString(),
                message: "  แก้ไขข้อ 3  "));

        Assert.Equal(HttpStatusCode.Created, response.StatusCode);

        await using var db = fixture.CreateDb();
        var version = await db.DocumentVersions.AsNoTracking().SingleAsync(v => v.DocumentId == documentId);
        Assert.Equal("แก้ไขข้อ 3", version.Message);
    }

    [Fact]
    public async Task Upload_OversizeMessage_Returns400_NoSideEffect()
    {
        var documentId = Guid.NewGuid();
        using var client = fixture.CreateClient();

        using var response = await client.PostAsync(
            $"api/documents/{documentId}/versions",
            ApiExtensions.VersionForm(
                TestDocx.BuildPlainDocx(), "doc.docx", Guid.NewGuid().ToString(),
                message: new string('ก', 2049)));

        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);

        await using var db = fixture.CreateDb();
        Assert.False(await db.Documents.AsNoTracking().AnyAsync(d => d.Id == documentId)); // ไม่มี side effect
    }

    [Fact]
    public async Task Upload_MessageExactly2048_Succeeds()
    {
        var documentId = Guid.NewGuid();
        using var client = fixture.CreateClient();
        var message = new string('ก', 2048);

        using var response = await client.PostAsync(
            $"api/documents/{documentId}/versions",
            ApiExtensions.VersionForm(
                TestDocx.BuildPlainDocx(), "doc.docx", Guid.NewGuid().ToString(),
                message: message));

        Assert.Equal(HttpStatusCode.Created, response.StatusCode);

        await using var db = fixture.CreateDb();
        var version = await db.DocumentVersions.AsNoTracking().SingleAsync(v => v.DocumentId == documentId);
        Assert.Equal(message, version.Message);
    }

    [Fact]
    public async Task SecondUpload_KeepsPerVersionMessages()
    {
        var documentId = Guid.NewGuid();
        using var client = fixture.CreateClient();

        using var first = await client.PostAsync(
            $"api/documents/{documentId}/versions",
            ApiExtensions.VersionForm(
                TestDocx.BuildPlainDocx("v1"), "doc.docx", Guid.NewGuid().ToString(),
                message: "ฉบับแรก"));
        using var second = await client.PostAsync(
            $"api/documents/{documentId}/versions",
            ApiExtensions.VersionForm(
                TestDocx.BuildPlainDocx("v2"), "doc.docx", Guid.NewGuid().ToString(),
                message: "แก้ไขเงินเดือน"));

        Assert.Equal(HttpStatusCode.Created, second.StatusCode);

        // history ใหม่ → เก่า พร้อม message ของแต่ละ version เป็นของตัวเอง
        using var history = await client.GetAsync($"api/documents/{documentId}/versions");
        var items = await history.Content.ReadFromJsonAsync<List<VersionItem>>(IntegrationTestFixture.Json);
        Assert.Equal(2, items!.Count);
        Assert.Equal(2, items[0].VersionNumber);
        Assert.Equal("แก้ไขเงินเดือน", items[0].Message);
        Assert.Equal(1, items[1].VersionNumber);
        Assert.Equal("ฉบับแรก", items[1].Message);
    }

    [Fact]
    public async Task Generate_WithMessage_CreatesV1WithMessage()
    {
        using var client = fixture.CreateClient();
        var (templateId, _) = await TestFlow.CreateConfiguredTemplateAsync(client, "msg-gen");

        var generated = await TestFlow.GenerateDocumentAsync(
            client, templateId, TestFlow.DefaultValues, message: "ฉบับเสนอลงนามครั้งแรก");

        await using var db = fixture.CreateDb();
        var version = await db.DocumentVersions.AsNoTracking()
            .SingleAsync(v => v.DocumentId == generated.DocumentId);
        Assert.Equal(1, version.VersionNumber);
        Assert.Equal("ฉบับเสนอลงนามครั้งแรก", version.Message);

        using var history = await client.GetAsync($"api/documents/{generated.DocumentId}/versions");
        var items = await history.Content.ReadFromJsonAsync<List<VersionItem>>(IntegrationTestFixture.Json);
        Assert.Equal("ฉบับเสนอลงนามครั้งแรก", items!.Single().Message);
    }

    /// <summary>400 ต้องเกิดก่อนแตะ MinIO/template — ไม่ทิ้ง orphan object ใน bucket</summary>
    [Fact]
    public async Task Generate_OversizeMessage_Returns400()
    {
        using var client = fixture.CreateClient();
        var (templateId, _) = await TestFlow.CreateConfiguredTemplateAsync(client, "msg-gen-oversize");

        using var response = await client.PostAsJsonAsync(
            "api/documents/generate",
            new { templateId, values = TestFlow.DefaultValues, message = new string('ก', 2049) },
            IntegrationTestFixture.Json);

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