using FluentAssertions;
using PageManager.Api.Data.Models;
using PageManager.Api.Services;
using PageManager.Api.Tests.Helpers;

namespace PageManager.Api.Tests.Unit.Services;

public class FileScannerServiceTests
{
    // ── GetFormatFromExtension ────────────────────────────────────────────────

    [Theory]
    [InlineData(".epub",  FileFormat.Epub)]
    [InlineData(".mobi",  FileFormat.Mobi)]
    [InlineData(".pdf",   FileFormat.Pdf)]
    [InlineData(".m4b",   FileFormat.M4b)]
    [InlineData(".mp3",   FileFormat.Mp3)]
    [InlineData(".aac",   FileFormat.Aac)]
    [InlineData(".flac",  FileFormat.Flac)]
    [InlineData(".EPUB",  FileFormat.Epub)]   // case-insensitive
    [InlineData(".PDF",   FileFormat.Pdf)]
    public void GetFormatFromExtension_KnownExtension_ReturnsFormat(string ext, FileFormat expected)
    {
        FileScannerService.GetFormatFromExtension(ext).Should().Be(expected);
    }

    [Theory]
    [InlineData(".txt")]
    [InlineData(".docx")]
    [InlineData(".zip")]
    [InlineData("")]
    public void GetFormatFromExtension_UnknownExtension_ReturnsNull(string ext)
    {
        FileScannerService.GetFormatFromExtension(ext).Should().BeNull();
    }

    // ── FindMatch ─────────────────────────────────────────────────────────────

    [Fact]
    public void FindMatch_FilenameContainsBookTitle_ReturnsBook()
    {
        var books = new[] { BookFactory.Create(id: 1, title: "Dune") };
        var file  = new BookFile { Filename = "Dune - Frank Herbert.epub" };

        FileScannerService.FindMatch(file, books)!.Id.Should().Be(1);
    }

    [Fact]
    public void FindMatch_CaseInsensitive_ReturnsBook()
    {
        var books = new[] { BookFactory.Create(id: 2, title: "The Way of Kings") };
        var file  = new BookFile { Filename = "the way of kings.epub" };

        FileScannerService.FindMatch(file, books)!.Id.Should().Be(2);
    }

    [Fact]
    public void FindMatch_FilenameContainsIsbn_ReturnsBook()
    {
        var books = new[] { BookFactory.Create(id: 3, title: "Foundation", isbn: "9780553293357") };
        var file  = new BookFile { Filename = "9780553293357.epub" };

        FileScannerService.FindMatch(file, books)!.Id.Should().Be(3);
    }

    [Fact]
    public void FindMatch_NoMatch_ReturnsNull()
    {
        var books = new[] { BookFactory.Create(id: 1, title: "Dune") };
        var file  = new BookFile { Filename = "Foundation - Isaac Asimov.epub" };

        FileScannerService.FindMatch(file, books).Should().BeNull();
    }

    [Fact]
    public void FindMatch_EmptyBookList_ReturnsNull()
    {
        FileScannerService.FindMatch(new BookFile { Filename = "anything.epub" }, []).Should().BeNull();
    }

    [Fact]
    public void FindMatch_BookWithNullIsbn_DoesNotThrow()
    {
        var books = new[] { BookFactory.Create(id: 1, title: "Dune", isbn: null) };
        var file  = new BookFile { Filename = "some-file.epub" };

        var act = () => FileScannerService.FindMatch(file, books);
        act.Should().NotThrow();
    }
}