// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.InternalTesting;
using Aspire.Cli.Caching;
using Aspire.Cli.Tests.Utils;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
 
namespace Aspire.Cli.Tests.Caching;
 
public class DiskCacheTests(ITestOutputHelper outputHelper)
{
    private static DiskCache CreateCache(TemporaryWorkspace workspace, Action<Dictionary<string,string?>>? configure = null)
    {
        var values = new Dictionary<string,string?>();
        configure?.Invoke(values);
        var configuration = new ConfigurationBuilder().AddInMemoryCollection(values).Build();
        var ctx = workspace.CreateExecutionContext();
        var loggerFactory = NullLoggerFactory.Instance; // no-op logging is fine here
        var logger = loggerFactory.CreateLogger<DiskCache>();
        return new DiskCache(logger, ctx, configuration);
    }
 
    [Fact]
    public async Task CacheMissThenHit()
    {
        using var workspace = TemporaryWorkspace.CreateForCli(outputHelper);
        var cache = CreateCache(workspace);
        var key = "query=foo|prerelease=False|take=10|skip=0|nugetConfigHash=abc|cliVersion=1.0";
 
        var miss = await cache.GetAsync(key, CancellationToken.None).DefaultTimeout();
        Assert.Null(miss);
 
        await cache.SetAsync(key, "RESULT-A", CancellationToken.None).DefaultTimeout();
        var hit = await cache.GetAsync(key, CancellationToken.None).DefaultTimeout();
        Assert.Equal("RESULT-A", hit);
    }
 
    [Fact]
    public async Task ExpiredEntryReturnsNull()
    {
        using var workspace = TemporaryWorkspace.CreateForCli(outputHelper);
        // Force very small expiry window (1 second)
        var cache = CreateCache(workspace, cfg =>
        {
            cfg["PackageSearchCacheExpirySeconds"] = "1"; // expiry window
            cfg["PackageSearchMaxCacheAgeSeconds"] = "3600"; // large max age so only expiry triggers
        });
        var key = "query=bar|prerelease=False|take=10|skip=0|nugetConfigHash=def|cliVersion=1.0";
 
        await cache.SetAsync(key, "RESULT-B", CancellationToken.None).DefaultTimeout();
        // Wait slightly over 1 second so entry expires
        await Task.Delay(TimeSpan.FromSeconds(2)).DefaultTimeout();
 
        var after = await cache.GetAsync(key, CancellationToken.None).DefaultTimeout();
        Assert.Null(after);
    }
 
    [Fact]
    public async Task NewerEntrySupersedesOlder()
    {
        using var workspace = TemporaryWorkspace.CreateForCli(outputHelper);
        var cache = CreateCache(workspace, cfg =>
        {
            cfg["PackageSearchCacheExpirySeconds"] = "60";
            cfg["PackageSearchMaxCacheAgeSeconds"] = "3600";
        });
        var diskPath = Path.Combine(workspace.WorkspaceRoot.FullName, ".aspire", "cache", "nuget-search");
        var key = "query=baz|prerelease=False|take=10|skip=0|nugetConfigHash=ghi|cliVersion=1.0";
 
        await cache.SetAsync(key, "OLD", CancellationToken.None).DefaultTimeout();
        // Slight delay to ensure different timestamp
        await Task.Delay(50);
        await cache.SetAsync(key, "NEW", CancellationToken.None).DefaultTimeout();
 
        var val = await cache.GetAsync(key, CancellationToken.None).DefaultTimeout();
        Assert.Equal("NEW", val);
 
        // Ensure only one valid (newest) file remains for the key
        var hash = GetHashForKey(key);
        var files = new DirectoryInfo(diskPath).Exists ? Directory.GetFiles(diskPath, $"{hash}.*.json") : Array.Empty<string>();
        // we allow old file possibly deleted; accept >=1; ensure newest content returned earlier
        Assert.True(files.Length >= 1);
    }
 
    [Fact]
    public async Task ClearRemovesEntries()
    {
        using var workspace = TemporaryWorkspace.CreateForCli(outputHelper);
        var cache = CreateCache(workspace);
        var key = "query=clear|prerelease=False|take=10|skip=0|nugetConfigHash=jkl|cliVersion=1.0";
        await cache.SetAsync(key, "VALUE", CancellationToken.None).DefaultTimeout();
        var before = await cache.GetAsync(key, CancellationToken.None).DefaultTimeout();
        Assert.NotNull(before);
        await cache.ClearAsync(CancellationToken.None).DefaultTimeout();
        var after = await cache.GetAsync(key, CancellationToken.None).DefaultTimeout();
        Assert.Null(after);
    }
 
    [Fact]
    public async Task OldFilesBeyondMaxAgeAreDeletedOnAccess()
    {
        using var workspace = TemporaryWorkspace.CreateForCli(outputHelper);
        // Max age = 1 second so we can simulate cleanup; expiry large to still treat as hit if not cleaned
        var cache = CreateCache(workspace, cfg =>
        {
            cfg["PackageSearchCacheExpirySeconds"] = "300"; // big
            cfg["PackageSearchMaxCacheAgeSeconds"] = "1";   // small
        });
        var key = "query=cleanup|prerelease=False|take=10|skip=0|nugetConfigHash=mno|cliVersion=1.0";
        await cache.SetAsync(key, "VALUE-X", CancellationToken.None).DefaultTimeout();
 
        // Manually adjust timestamp older than max age by renaming file
        var diskPath = Path.Combine(workspace.WorkspaceRoot.FullName, ".aspire", "cache", "nuget-search");
        var hash = GetHashForKey(key);
        var files = Directory.GetFiles(diskPath, $"{hash}.*.json");
        Assert.Single(files);
        var current = files[0];
        var nameNoExt = Path.GetFileNameWithoutExtension(current);
        var parts = nameNoExt.Split('.');
        Assert.Equal(2, parts.Length);
        var oldUnix = DateTimeOffset.UtcNow.AddSeconds(-5).ToUnixTimeSeconds();
        var oldName = Path.Combine(diskPath, $"{hash}.{oldUnix}.json");
        File.Move(current, oldName, overwrite: true);
 
        // Trigger Get which should treat it as too old and delete
        var val = await cache.GetAsync(key, CancellationToken.None).DefaultTimeout();
        Assert.Null(val); // treated as miss after cleanup
        Assert.False(File.Exists(oldName));
    }
 
    private static string GetHashForKey(string key)
    {
        using var sha = System.Security.Cryptography.SHA256.Create();
        var bytes = System.Text.Encoding.UTF8.GetBytes(key);
        return Convert.ToHexString(sha.ComputeHash(bytes));
    }
}