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

namespace ClawdDotNet.Tools.Tests.FileRW;

/// <summary>
/// #719: FileRW is the main way into the workspaces — every change it makes lands in the
/// history, with the agent and the run of the call.
/// </summary>
public sealed class FileHistoryRecordingTests : IDisposable
{
    private readonly string _instance = Path.Combine(Path.GetTempPath(), "clawd-tests", "fh-" + Guid.NewGuid().ToString("N")[..8]);
    private readonly string _agents;
    private readonly FileHistory _history;
    private readonly FileRWTool _tool = new();

    public FileHistoryRecordingTests()
    {
        _agents = Path.Combine(_instance, "Agents");
        Directory.CreateDirectory(Path.Combine(_agents, "SharedWorkspace"));
        _history = new FileHistory(_agents, new SqliteStorage(Path.Combine(_instance, "state.db")));
    }

    public void Dispose()
    {
        SqliteStorage.ReleasePooledConnections(_instance);
        try { Directory.Delete(_instance, recursive: true); }
        catch { /* cleanup is secondary */ }
    }

    private Task<ToolResult> Run(string agentId, object input)
    {
        var personal = Path.Combine(_agents, "Agent-" + agentId, "Workspace");
        Directory.CreateDirectory(personal);
        var context = new AgentToolContext(agentId, "inst",
            new Dictionary<string, object?> { ["sharedAccessLevel"] = "Admin" },
            new NullStateStore(), NullLogger.Instance, CancellationToken.None,
            WorkspacePath: personal, SharedWorkspacePath: Path.Combine(_agents, "SharedWorkspace"))
        {
            History = _history,
            RunId = "run-" + agentId
        };
        return _tool.ExecuteAsync(JsonSerializer.SerializeToElement(input), context, CancellationToken.None);
    }

    private async Task<List<FileHistoryEntry>> Journal() => (await _history.ListAsync(null, null, null, null, 100, default)).Reverse().ToList();

    [Fact]
    public async Task Write_append_and_delete_are_recorded_with_agent_and_run()
    {
        await Run("a", new { action = "write", workspace = "shared", path = "notes/plan.md", content = "v1" });
        await Run("b", new { action = "append", workspace = "shared", path = "notes/plan.md", content = "\n+b" });
        await Run("c", new { action = "delete", workspace = "shared", path = "notes/plan.md" });

        (await Journal()).Select(e => (e.Action, e.AgentId, e.RunId, e.Path, e.Workspace)).ShouldBe([
            (FileAction.Create, "a", "run-a", "SharedWorkspace/notes/plan.md", "shared"),
            (FileAction.Append, "b", "run-b", "SharedWorkspace/notes/plan.md", "shared"),
            (FileAction.Delete, "c", "run-c", "SharedWorkspace/notes/plan.md", "shared")
        ]);
    }

    [Fact]
    public async Task What_a_delete_removed_can_be_read_back()
    {
        await Run("a", new { action = "write", workspace = "shared", path = "plan.md", content = "precious" });
        await Run("b", new { action = "delete", workspace = "shared", path = "plan.md" });

        var delete = (await Journal()).Last();
        Encoding.UTF8.GetString(_history.Content(delete.HashBefore)!).ShouldBe("precious");
    }

    [Fact]
    public async Task Deleting_a_folder_records_each_file()
    {
        await Run("a", new { action = "write", workspace = "shared", path = "old/1.md", content = "one" });
        await Run("a", new { action = "write", workspace = "shared", path = "old/2.md", content = "two" });

        await Run("a", new { action = "delete", workspace = "shared", path = "old" });

        (await Journal()).Count(e => e.Action == FileAction.Delete).ShouldBe(2);
    }

    [Fact]
    public async Task A_copy_is_recorded_at_its_destination()
    {
        await Run("a", new { action = "write", workspace = "shared", path = "src.md", content = "x" });
        await Run("a", new { action = "copy", workspace = "shared", path = "src.md", destinationPath = "dst.md" });

        (await Journal()).Last().ShouldSatisfyAllConditions(
            e => e.Action.ShouldBe(FileAction.Copy),
            e => e.Path.ShouldBe("SharedWorkspace/dst.md"));
    }

    [Fact]
    public async Task The_personal_workspace_is_recorded_under_its_owner()
    {
        await Run("a", new { action = "write", path = "mine.md", content = "x" });

        var entry = (await Journal()).Single();
        entry.Workspace.ShouldBe("personal:a");
        entry.Path.ShouldBe("Agent-a/Workspace/mine.md");
    }

    [Fact]
    public async Task A_stock_data_point_records_the_file_and_the_index()
    {
        await Run("a", new { action = "stock_add", ticker = "ACME", category = "news", source = "test", title = "A title" });

        var journal = await Journal();
        journal.ShouldContain(e => e.Path.EndsWith("/_index.json") && e.Action == FileAction.Create);
        journal.ShouldContain(e => e.Path.Contains("/stocks/ACME/") && !e.Path.EndsWith("_index.json"));
    }
}