using System.Text.Json;
using ClawdDotNet.Core.State;
using ClawdDotNet.Core.Tools;
using ClawdDotNet.Tools.FileRW;
using Microsoft.Extensions.Logging.Abstractions;
using Shouldly;

namespace ClawdDotNet.Tools.Tests.FileRW;

/// <summary>
/// Batch reading (#663) and the hint about the other workspace (#662).
///
/// Occasion from test operation: the daily close read 24 hourly files individually and died
/// at the step limit, and the same agent repeatedly fetched files in the wrong workspace,
/// because the error message did not say where they lie.
/// </summary>
public sealed class BatchReadTests : IDisposable
{
    private readonly string _basis;
    private readonly string _personal;
    private readonly string _shared;
    private readonly FileRWTool _tool = new();

    public BatchReadTests()
    {
        _basis = Path.Combine(Path.GetTempPath(), "clawd-tests", Guid.NewGuid().ToString("N"));
        _personal = Path.Combine(_basis, "Workspace");
        _shared = Path.Combine(_basis, "SharedWorkspace");
        Directory.CreateDirectory(_personal);
        Directory.CreateDirectory(Path.Combine(_shared, "wetter", "stunden"));
    }

    public void Dispose()
    {
        try { Directory.Delete(_basis, recursive: true); }
        catch { /* Cleaning up is secondary */ }
    }

    private AgentToolContext Context(string sharedLevel = "ReadWrite") => new(
        "hausmeister", "inst",
        new Dictionary<string, object?> { ["sharedAccessLevel"] = sharedLevel },
        new NullStateStore(),
        NullLogger.Instance,
        CancellationToken.None,
        WorkspacePath: _personal,
        SharedWorkspacePath: _shared);

    private Task<ToolResult> Run(string json, string sharedLevel = "ReadWrite")
        => _tool.ExecuteAsync(JsonDocument.Parse(json).RootElement, Context(sharedLevel), CancellationToken.None);

    private void HourlyFiles(int count, string tag = "2026-09-20")
    {
        for (var hour = 0; hour < count; hour++)
        {
            File.WriteAllText(
                Path.Combine(_shared, "wetter", "stunden", $"berlin_{tag}_{hour:00}-00.txt"),
                $"{tag} {hour:00}:00 Temperatur {10 + hour} C");
        }
    }

    // ═══════════════════ #663: one call instead of 24 ═══════════════════

    [Fact]
    public async Task A_directory_with_pattern_comes_in_one_call()
    {
        HourlyFiles(24);
        HourlyFiles(3, "2026-09-19");

        var result = await Run("""{"action":"read_many","workspace":"shared","path":"wetter/stunden","pattern":"berlin_2026-09-20_*.txt"}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
        result.Content.ShouldContain("24 of 24 file(s) read");
        result.Content.ShouldContain("Temperatur 10 C");
        result.Content.ShouldContain("Temperatur 33 C");
        result.Content.ShouldNotContain("2026-09-19", Case.Sensitive);
    }

    [Fact]
    public async Task The_files_come_named_and_in_fixed_order()
    {
        HourlyFiles(3);

        var result = await Run("""{"action":"read_many","workspace":"shared","path":"wetter/stunden"}""");

        var sequence = new[] { "00-00.txt", "01-00.txt", "02-00.txt" }
            .Select(n => result.Content.IndexOf(n, StringComparison.Ordinal)).ToList();
        sequence.ShouldAllBe(i => i > 0);
        sequence.ShouldBe(sequence.OrderBy(i => i).ToList(), "sortiert, damit der Agent den Tag zusammensetzen kann");
        result.Content.ShouldContain("--- shared:/wetter/stunden/berlin_2026-09-20_01-00.txt ---");
    }

    [Fact]
    public async Task An_explicit_list_is_read_and_missing_ones_named()
    {
        HourlyFiles(2);

        var result = await Run("""
            {"action":"read_many","workspace":"shared","paths":[
              "wetter/stunden/berlin_2026-09-20_00-00.txt",
              "wetter/stunden/berlin_2026-09-20_09-00.txt"]}
            """);

        result.Success.ShouldBeTrue(result.ErrorMessage);
        result.Content.ShouldContain("1 of 2 file(s) read");
        result.Content.ShouldContain("Not found: wetter/stunden/berlin_2026-09-20_09-00.txt");
    }

    [Fact]
    public async Task Too_many_files_are_capped_and_the_rest_named()
    {
        HourlyFiles(60);

        var result = await Run("""{"action":"read_many","workspace":"shared","path":"wetter/stunden"}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
        result.Content.ShouldContain($"{FileRWTool.MaxFilesPerCall} of 60 file(s) read");
        result.Content.ShouldContain("Skipped reading");
        result.Content.ShouldContain("fetch with an additional call");
    }

    [Fact]
    public async Task An_empty_directory_reports_as_an_error()
    {
        var result = await Run("""{"action":"read_many","workspace":"shared","path":"wetter/stunden"}""");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("No matching file");
    }

    [Fact]
    public async Task Without_read_right_on_the_shared_area_nothing_comes_out()
    {
        HourlyFiles(2);

        var result = await Run("""{"action":"read_many","workspace":"shared","path":"wetter/stunden"}""", sharedLevel: "Denied");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("Access denied");
    }

    [Fact]
    public async Task Escaping_the_workspace_is_rejected_here_too()
    {
        var result = await Run("""{"action":"read_many","workspace":"shared","paths":["../../geheim.txt"]}""");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("Access denied");
    }

    [Fact]
    public async Task A_forbidden_file_extension_is_skipped_instead_of_toppling_the_run()
    {
        HourlyFiles(2);
        File.WriteAllText(Path.Combine(_shared, "wetter", "stunden", "skript.exe"), "MZ");

        var result = await Run("""{"action":"read_many","workspace":"shared","path":"wetter/stunden"}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
        result.Content.ShouldContain("2 of 2 file(s) read");
        result.Content.ShouldNotContain("skript.exe");
    }

    // ═══════════════════ #662: hint about the other workspace ═══════════════════

    [Fact]
    public async Task If_the_file_is_in_the_other_workspace_the_message_says_so()
    {
        HourlyFiles(1);

        var result = await Run("""{"action":"read","path":"wetter/stunden/berlin_2026-09-20_00-00.txt"}""");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("exists in the shared workspace");
        result.ErrorMessage.ShouldContain("workspace: \"shared\"", Case.Sensitive);
    }

    [Fact]
    public async Task A_directory_gets_the_hint_too()
    {
        var result = await Run("""{"action":"list","path":"wetter/stunden"}""");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("exists in the shared workspace");
    }

    [Fact]
    public async Task Without_right_on_the_other_workspace_there_is_no_hint()
    {
        // A hint about something the agent may not do anyway sends it into nothing.
        HourlyFiles(1);

        var result = await Run("""{"action":"read","path":"wetter/stunden/berlin_2026-09-20_00-00.txt"}""", sharedLevel: "Denied");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldNotContain("exists in");
    }

    [Fact]
    public async Task If_the_path_exists_nowhere_the_message_stays_plain()
    {
        var result = await Run("""{"action":"read","workspace":"shared","path":"wetter/stunden/fehlt.txt"}""");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("File not found");
        result.ErrorMessage.ShouldNotContain("exists in");
    }
}