using System.Net;
using System.Net.Http.Json;
using Microsoft.EntityFrameworkCore;
using WordVersioning.Api.Services;

namespace WordVersioning.Api.IntegrationTests;

/// <summary>FR-16 — ไฟล์ร่าง (draft): generate docx จาก template แบบ stateless
/// (ค่าครบ + stamp เฉพาะ TemplateId + ไม่เกิด Document/version ใดๆ ในระบบ)</summary>
[Collection(IntegrationTestCollection.Name)]
public sealed class DraftTests(IntegrationTestFixture fixture)
{
    [Fact]
    public async Task Draft_FillsAllFields_PreservesFormatting_StampsOnlyTemplateId_CreatesNothing()
    {
        using var client = fixture.CreateClient();
        var (templateId, _) = await TestFlow.CreateConfiguredTemplateAsync(client, "draft หลัก");

        using var response = await client.PostAsJsonAsync(
            $"api/templates/{templateId}/generate-draft",
            new { values = TestFlow.DefaultValues }, IntegrationTestFixture.Json);
        Assert.Equal(HttpStatusCode.OK, response.StatusCode); // ไม่ใช่ 201 — ไม่มีอะไรถูกสร้าง

        // คืนไฟล์ docx พร้อมชื่อไฟล์จากชื่อ template (Content-Disposition attachment)
        Assert.Equal(TestDocx.DocxContentType, response.Content.Headers.ContentType?.MediaType);
        Assert.NotNull(response.Content.Headers.ContentDisposition?.FileNameStar);

        var fileBytes = await response.Content.ReadAsByteArrayAsync();

        // (1) ค่าทุก field ถูกแทนที่ใน SDT — เหมือน generate ปกติ
        Assert.Equal("สมหญิง รักงาน", TestDocx.ReadSdtText(fileBytes, "employee_name"));
        Assert.Equal("วิศวกรซอฟต์แวร์", TestDocx.ReadSdtText(fileBytes, "position"));
        Assert.Equal("75000", TestDocx.ReadSdtText(fileBytes, "salary"));
        Assert.Equal("2026-08-01", TestDocx.ReadSdtText(fileBytes, "start_date"));

        // (2) multi-run SDT ยังรักษา formatting ของ run แรก (bold)
        var positionRuns = TestDocx.ReadSdtRuns(fileBytes, "position");
        var runWithText = Assert.Single(positionRuns.Where(r => r.Text.Length > 0));
        Assert.True(runWithText.Bold);

        // (3) stamp เฉพาะ TemplateId — ไม่มี SavedByAddIn/DocumentTrackingId เพื่อให้ add-in เห็นเป็น untracked (FR-16)
        Assert.Equal(templateId.ToString(), TestDocx.ReadCustomProperty(fileBytes, AddInMetadata.TemplateIdPropertyName));
        Assert.Null(TestDocx.ReadCustomProperty(fileBytes, "SavedByAddIn"));
        Assert.Null(TestDocx.ReadCustomProperty(fileBytes, "DocumentTrackingId"));

        // (4) stateless จริง: ไม่เกิด Document/version ใดๆ จาก template นี้
        await using var db = fixture.CreateDb();
        Assert.False(await db.Documents.AsNoTracking().AnyAsync(d => d.TemplateId == templateId));
        Assert.False(await db.DocumentVersions.AsNoTracking()
            .AnyAsync(v => db.Documents.Any(d => d.Id == v.DocumentId && d.TemplateId == templateId)));
        Assert.False(await db.DocumentFieldValues.AsNoTracking()
            .AnyAsync(v => db.Documents.Any(d => d.Id == v.DocumentId && d.TemplateId == templateId)));
    }

    [Fact]
    public async Task Draft_MissingRequiredField_Returns400()
    {
        using var client = fixture.CreateClient();
        var (templateId, _) = await TestFlow.CreateConfiguredTemplateAsync(client, "draft required ขาด");

        var values = new Dictionary<string, string>(TestFlow.DefaultValues);
        values.Remove("employee_name"); // required field หาย

        using var response = await client.PostAsJsonAsync(
            $"api/templates/{templateId}/generate-draft", new { values }, IntegrationTestFixture.Json);
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
        var error = await response.Content.ReadAsStringAsync();
        Assert.Contains("employee_name", error);
    }

    [Theory]
    [InlineData("salary", "ไม่ใช่เลข")]
    [InlineData("start_date", "ไม่ใช่วันที่")]
    public async Task Draft_WrongFieldType_Returns400(string key, string badValue)
    {
        using var client = fixture.CreateClient();
        var (templateId, _) = await TestFlow.CreateConfiguredTemplateAsync(client, $"draft type ผิด {key}");

        var values = new Dictionary<string, string>(TestFlow.DefaultValues) { [key] = badValue };

        using var response = await client.PostAsJsonAsync(
            $"api/templates/{templateId}/generate-draft", new { values }, IntegrationTestFixture.Json);
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    [Fact]
    public async Task Draft_UnknownTemplate_Returns404()
    {
        using var client = fixture.CreateClient();

        using var response = await client.PostAsJsonAsync(
            $"api/templates/{Guid.NewGuid()}/generate-draft",
            new { values = TestFlow.DefaultValues }, IntegrationTestFixture.Json);
        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
    }

    [Fact]
    public async Task Draft_DeactivatedTemplate_Returns400()
    {
        using var client = fixture.CreateClient();
        var (templateId, _) = await TestFlow.CreateConfiguredTemplateAsync(client, "draft deactivate");

        using var deactivate = await client.DeleteAsync($"api/templates/{templateId}");
        Assert.Equal(HttpStatusCode.NoContent, deactivate.StatusCode);

        using var response = await client.PostAsJsonAsync(
            $"api/templates/{templateId}/generate-draft",
            new { values = TestFlow.DefaultValues }, IntegrationTestFixture.Json);
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    [Fact]
    public async Task Draft_IgnoresUndefinedValues()
    {
        using var client = fixture.CreateClient();
        var (templateId, _) = await TestFlow.CreateConfiguredTemplateAsync(client, "draft ค่าเกินนิยาม");

        var values = new Dictionary<string, string>(TestFlow.DefaultValues)
        {
            ["field_ที่ไม่มีใน_template"] = "ส่งเกินมา", // policy FR-11: ignore
        };

        using var response = await client.PostAsJsonAsync(
            $"api/templates/{templateId}/generate-draft", new { values }, IntegrationTestFixture.Json);
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        var fileBytes = await response.Content.ReadAsByteArrayAsync();
        Assert.Equal(templateId.ToString(), TestDocx.ReadCustomProperty(fileBytes, AddInMetadata.TemplateIdPropertyName));
    }
}