using GatewayKeepalive.Core;

namespace GatewayKeepalive.Tests;

internal static class LogFallbackTests
{
    public static Task WritablePrimaryDirectoryIsUsedAsync()
    {
        using var temp = new TempDirectory();
        var target = Path.Combine(temp.DirectoryPath, "logs");
        var log = new FileLog(target);

        log.Write("测试：首选目录可写");

        Check.Equal(Path.GetFullPath(target), Path.GetFullPath(log.ActiveDirectory), "A writable primary directory must stay active");
        Check.True(log.LastFailure is null, "No failure should be recorded when the primary directory works");
        var file = Path.Combine(target, $"gateway-{DateTime.Now:yyyy-MM-dd}.log");
        Check.True(File.Exists(file), "The log file should exist in the primary directory");
        Check.Contains("测试：首选目录可写", File.ReadAllText(file), "The line should land in the primary log");
        return Task.CompletedTask;
    }

    public static Task UnusablePrimaryDirectoryFallsBackAsync()
    {
        using var temp = new TempDirectory();
        var blocked = Path.Combine(temp.DirectoryPath, "blocked");
        File.WriteAllText(blocked, "a file, so no directory can be created here");
        var log = new FileLog(blocked);

        log.Write("测试：日志回退");

        Check.True(
            !string.Equals(Path.GetFullPath(blocked), Path.GetFullPath(log.ActiveDirectory), StringComparison.OrdinalIgnoreCase),
            "An unusable primary directory must be replaced by a fallback");
        Check.True(log.LastFailure is not null, "The unusable primary directory should be reported as a failure");
        Check.Contains("blocked", log.LastFailure!, "The failure text should name the unusable directory");

        var fallback = Path.Combine(log.ActiveDirectory, $"gateway-{DateTime.Now:yyyy-MM-dd}.log");
        Check.True(File.Exists(fallback), "The line should be written to the fallback directory");
        Check.Contains("测试：日志回退", File.ReadAllText(fallback), "The line should be present in the fallback log");
        return Task.CompletedTask;
    }
}