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

namespace PageManager.Api.Tests.Unit.Services;

public class FileOrganizerServiceTests
{
    // ── SanitizePathComponent ─────────────────────────────────────────────────

    [Theory]
    [InlineData("Andy Weir",          "Andy Weir")]
    [InlineData("Brandon Sanderson",  "Brandon Sanderson")]
    [InlineData("Hello: World",       "Hello_ World")]    // colon is invalid
    [InlineData("Title/Sub",          "Title_Sub")]        // slash is invalid
    [InlineData("Name.",              "Name")]             // trailing dot stripped
    [InlineData("  Name  ",          "Name")]              // whitespace trimmed
    public void SanitizePathComponent_ReturnsExpected(string input, string expected)
    {
        FileOrganizerService.SanitizePathComponent(input).Should().Be(expected);
    }

    // ── ComputeCanonicalRelativePath — ebooks ─────────────────────────────────

    [Fact]
    public void Ebook_WithYear_ProducesAuthorTitleYearFolder()
    {
        var book = BookFactory.Create(title: "The Martian", year: 2011)
                              .WithAuthors((1, "Andy Weir"));

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".epub", isAudio: false);

        result.Should().Be(Path.Combine("Andy Weir", "The Martian (2011)", "The Martian.epub"));
    }

    [Fact]
    public void Ebook_WithoutYear_OmitsYearFromFolder()
    {
        var book = BookFactory.Create(title: "Dune", year: null)
                              .WithAuthors((1, "Frank Herbert"));

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".epub", isAudio: false);

        result.Should().Be(Path.Combine("Frank Herbert", "Dune", "Dune.epub"));
    }

    [Fact]
    public void Ebook_SeriesIgnored_SeriesNotInEbookPath()
    {
        var book = BookFactory.Create(title: "The Way of Kings", year: 2010)
                              .WithAuthors((1, "Brandon Sanderson"))
                              .WithSeries(seriesName: "The Stormlight Archive");

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".epub", isAudio: false);

        // Series folder should NOT appear for ebooks
        result.Should().Be(Path.Combine("Brandon Sanderson", "The Way of Kings (2010)", "The Way of Kings.epub"));
    }

    // ── ComputeCanonicalRelativePath — audiobooks ─────────────────────────────

    [Fact]
    public void Audiobook_WithoutSeries_ProducesAuthorTitleTitle()
    {
        var book = BookFactory.Create(title: "Project Hail Mary", year: 2021)
                              .WithAuthors((1, "Andy Weir"));

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".m4b", isAudio: true);

        result.Should().Be(Path.Combine("Andy Weir", "Project Hail Mary", "Project Hail Mary.m4b"));
    }

    [Fact]
    public void Audiobook_WithSeries_InsertSeriesFolderBetweenAuthorAndTitle()
    {
        var book = BookFactory.Create(title: "The Way of Kings", year: 2010)
                              .WithAuthors((1, "Brandon Sanderson"))
                              .WithSeries(seriesName: "The Stormlight Archive");

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".m4b", isAudio: true);

        result.Should().Be(Path.Combine("Brandon Sanderson", "The Stormlight Archive", "The Way of Kings", "The Way of Kings.m4b"));
    }

    [Fact]
    public void Audiobook_Mp3Extension_PreservedInFilename()
    {
        var book = BookFactory.Create(title: "Dune", year: 1965)
                              .WithAuthors((1, "Frank Herbert"));

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".mp3", isAudio: true);

        result.Should().Be(Path.Combine("Frank Herbert", "Dune", "Dune.mp3"));
    }

    // ── Multiple authors ──────────────────────────────────────────────────────

    [Fact]
    public void MultipleAuthors_UsesPrimaryAuthorForPath()
    {
        var book = BookFactory.Create(title: "Good Omens", year: 1990)
                              .WithAuthors((1, "Terry Pratchett"), (2, "Neil Gaiman"));

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".epub", isAudio: false);

        result.Should().StartWith("Terry Pratchett");
        result.Should().NotContain("Neil Gaiman");
    }

    [Fact]
    public void NoAuthors_UsesUnknownFolder()
    {
        var book = BookFactory.Create(title: "Anonymous Work", year: 2000);
        // No authors added

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".epub", isAudio: false);

        result.Should().StartWith("Unknown");
    }

    // ── Sanitization edge cases ───────────────────────────────────────────────

    [Fact]
    public void TitleWithInvalidChars_Sanitized()
    {
        var book = BookFactory.Create(title: "Title: A Story", year: 2020)
                              .WithAuthors((1, "Author Name"));

        var result = FileOrganizerService.ComputeCanonicalRelativePath(book, ".epub", isAudio: false);

        result.Should().Be(Path.Combine("Author Name", "Title_ A Story (2020)", "Title_ A Story.epub"));
    }
}