using System.Text.Json;
using ClawdDotNet.Core.Config;
using ClawdDotNet.Core.Organisation;
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>
/// #684: Named workspaces with member lists. Purchasing files its things in its own
/// workspace, marketing reads the article master that purchasing owns, and accounting's
/// workspace does not exist for anyone outside accounting — not even as a name.
/// </summary>
public sealed class WorkspaceAreasTests : IDisposable
{
    private readonly string _agents;
    private readonly FileRWTool _tool = new();

    private readonly List<UnitConfig> _units =
    [
        new() { Id = "purchasing", Name = "Purchasing" },
        new() { Id = "suppliers", Name = "Suppliers", ParentId = "purchasing" },
        new() { Id = "marketing", Name = "Marketing" },
        new() { Id = "accounting", Name = "Accounting" }
    ];

    private readonly List<AgentConfig> _people =
    [
        new() { AgentId = "buyer", UnitId = "purchasing" },
        new() { AgentId = "scout", UnitId = "suppliers" },
        new() { AgentId = "ads", UnitId = "marketing" },
        new() { AgentId = "copywriter", UnitId = "marketing" },
        new() { AgentId = "bookkeeper", UnitId = "accounting" },
        new() { AgentId = "auditor" }
    ];

    private readonly List<WorkspaceConfig> _workspaces =
    [
        Own("purchasing"),
        Own("suppliers"),
        Own("marketing"),
        Own("accounting"),
        new()
        {
            Id = "articles", Name = "Article master", OwnerUnitId = "purchasing",
            Members =
            [
                new() { UnitId = "purchasing", Access = WorkspaceAccess.Manage },
                new() { UnitId = "marketing", Access = WorkspaceAccess.Read },
                new() { AgentId = "auditor", Access = WorkspaceAccess.Read },
                new() { AgentId = "copywriter", Access = WorkspaceAccess.Write }
            ],
            ProtectedPaths = ["prices"]
        }
    ];

    private static WorkspaceConfig Own(string unit) => new()
    {
        Id = unit, Name = unit, OwnerUnitId = unit,
        Members = [new() { UnitId = unit, Access = WorkspaceAccess.Write }]
    };

    public WorkspaceAreasTests()
    {
        _agents = Path.Combine(Path.GetTempPath(), "clawd-tests", Guid.NewGuid().ToString("N"), "Agents");
        Directory.CreateDirectory(Path.Combine(_agents, "SharedWorkspace"));
    }

    public void Dispose()
    {
        try { Directory.Delete(Path.GetDirectoryName(_agents)!, recursive: true); }
        catch { /* cleaning up is secondary */ }
    }

    private string Area(string id) => Path.Combine(_agents, "SharedWorkspaces", id);

    private AgentToolContext Context(string agentId, string sharedLevel = "Denied", bool withUnits = true)
    {
        var personal = Path.Combine(_agents, agentId, "Workspace");
        Directory.CreateDirectory(personal);
        return new AgentToolContext(
            agentId, "inst",
            new Dictionary<string, object?> { ["sharedAccessLevel"] = sharedLevel },
            new NullStateStore(), NullLogger.Instance, CancellationToken.None,
            WorkspacePath: personal,
            SharedWorkspacePath: Path.Combine(_agents, "SharedWorkspace"))
        {
            Organisation = withUnits ? new OrgChart(_units, _people, _workspaces) : new OrgChart([], _people)
        };
    }

    private Task<ToolResult> Run(string agentId, object input, string sharedLevel = "Denied", bool withUnits = true)
        => _tool.ExecuteAsync(JsonSerializer.SerializeToElement(input), Context(agentId, sharedLevel, withUnits), CancellationToken.None);

    // ═══════════════════ the own unit ═══════════════════

    [Fact]
    public async Task An_agent_writes_to_its_unit_without_knowing_the_unit_id()
    {
        var result = await Run("buyer", new { action = "write", workspace = "unit", path = "orders.md", content = "3 pallets" });

        result.Success.ShouldBeTrue(result.ErrorMessage);
        File.ReadAllText(Path.Combine(Area("purchasing"), "orders.md")).ShouldBe("3 pallets");
        result.Content.ShouldContain("purchasing:/orders.md", Case.Sensitive, "the answer names the workspace by its id");
    }

    [Fact]
    public async Task A_colleague_finds_it_under_the_same_name()
    {
        await Run("buyer", new { action = "write", workspace = "purchasing", path = "orders.md", content = "3 pallets" });

        // The scout sits in suppliers, below purchasing — the purchasing entry includes sub-units.
        var read = await Run("scout", new { action = "read", workspace = "purchasing", path = "orders.md" });

        read.Success.ShouldBeTrue(read.ErrorMessage);
        read.Content.ShouldContain("3 pallets");
    }

    [Fact]
    public async Task A_unit_s_workspace_does_not_exist_for_other_units()
    {
        await Run("bookkeeper", new { action = "write", workspace = "unit", path = "salaries.md", content = "secret" });

        var probe = await Run("ads", new { action = "read", workspace = "accounting", path = "salaries.md" });
        var unknown = await Run("ads", new { action = "read", workspace = "does-not-exist", path = "x.md" });

        probe.Success.ShouldBeFalse();
        probe.ErrorMessage!.ShouldStartWith("Unknown workspace 'accounting'");
        // The same answer as for a name that does not exist — nothing tells marketing it is there.
        probe.ErrorMessage.Replace("accounting", "X").ShouldBe(unknown.ErrorMessage!.Replace("does-not-exist", "X"));
        probe.ErrorMessage.ShouldNotContain("accounting,");
    }

    [Fact]
    public async Task The_answer_to_an_unknown_name_lists_what_the_agent_can_use()
    {
        var result = await Run("ads", new { action = "list", workspace = "team" }, sharedLevel: "Read");

        result.ErrorMessage!.ShouldContain("personal, shared, unit (= marketing), articles");
    }

    // ═══════════════════ shared across units ═══════════════════

    [Fact]
    public async Task Marketing_reads_the_article_master_but_cannot_write_it()
    {
        await Run("buyer", new { action = "write", workspace = "articles", path = "a-100.md", content = "Chair" });

        (await Run("ads", new { action = "read", workspace = "articles", path = "a-100.md" })).Content.ShouldContain("Chair");

        var write = await Run("ads", new { action = "write", workspace = "articles", path = "a-100.md", content = "Sofa" });
        write.Success.ShouldBeFalse();
        write.ErrorMessage!.ShouldContain("not allowed in workspace 'articles'");
    }

    [Fact]
    public async Task A_single_agent_can_be_a_member_without_its_unit()
    {
        var result = await Run("auditor", new { action = "list", workspace = "articles" });

        result.Success.ShouldBeTrue(result.ErrorMessage);
    }

    [Fact]
    public async Task Protected_paths_hold_for_writers_but_not_for_managers()
    {
        (await Run("buyer", new { action = "write", workspace = "articles", path = "prices/a-100.md", content = "10" })).Success.ShouldBeTrue();

        // The copywriter may write here, but prices are append-only for writers…
        var overwrite = await Run("copywriter", new { action = "write", workspace = "articles", path = "prices/a-100.md", content = "1" });
        overwrite.Success.ShouldBeFalse();
        overwrite.ErrorMessage!.ShouldContain("Protected area");
        (await Run("copywriter", new { action = "write", workspace = "articles", path = "prices/a-101.md", content = "5" })).Success
            .ShouldBeTrue("adding a new file is what protected paths allow");

        // …while purchasing manages the workspace, which includes changing them, as Admin did.
        (await Run("buyer", new { action = "write", workspace = "articles", path = "prices/a-100.md", content = "12" })).Success.ShouldBeTrue();
        File.ReadAllText(Path.Combine(Area("articles"), "prices", "a-100.md")).ShouldBe("12");
    }

    [Fact]
    public async Task Writing_is_not_deleting()
    {
        await Run("buyer", new { action = "write", workspace = "unit", path = "draft.md", content = "x" });

        var delete = await Run("buyer", new { action = "delete", workspace = "unit", path = "draft.md" });

        delete.Success.ShouldBeFalse("deleting needs Manage, as it needed Admin before");
        File.Exists(Path.Combine(Area("purchasing"), "draft.md")).ShouldBeTrue();
    }

    [Fact]
    public async Task Copy_goes_from_the_own_unit_to_a_shared_workspace()
    {
        await Run("buyer", new { action = "write", workspace = "unit", path = "a-200.md", content = "Table" });

        var copy = await Run("buyer", new { action = "copy", workspace = "unit", path = "a-200.md", destinationWorkspace = "articles", destinationPath = "a-200.md" });

        copy.Success.ShouldBeTrue(copy.ErrorMessage);
        File.ReadAllText(Path.Combine(Area("articles"), "a-200.md")).ShouldBe("Table");
    }

    [Fact]
    public async Task The_hint_points_to_the_workspace_where_the_file_is()
    {
        await Run("buyer", new { action = "write", workspace = "unit", path = "orders.md", content = "3 pallets" });

        var result = await Run("buyer", new { action = "read", path = "orders.md" });

        result.ErrorMessage!.ShouldContain("exists in the purchasing workspace");
    }

    // ═══════════════════ the one shared folder ═══════════════════

    [Fact]
    public async Task Shared_works_as_before_by_the_agent_s_own_level()
    {
        (await Run("ads", new { action = "write", workspace = "shared", path = "note.md", content = "x" }, sharedLevel: "ReadWrite"))
            .Success.ShouldBeTrue();

        var denied = await Run("ads", new { action = "write", workspace = "shared", path = "note.md", content = "y" }, sharedLevel: "Read");
        denied.ErrorMessage!.ShouldContain("not allowed in workspace 'shared'");
    }

    [Fact]
    public async Task With_units_the_task_files_are_closed_to_FileRW()
    {
        var tasks = Path.Combine(_agents, "SharedWorkspace", "tasks");
        Directory.CreateDirectory(tasks);
        File.WriteAllText(Path.Combine(tasks, "t-1.md"), "---\nassignee: bookkeeper\n---");

        var read = await Run("ads", new { action = "read", workspace = "shared", path = "tasks/t-1.md" }, sharedLevel: "Admin");
        var write = await Run("ads", new { action = "write", workspace = "shared", path = "tasks/t-2.md", content = "sneaky" }, sharedLevel: "Admin");
        var list = await Run("ads", new { action = "list", workspace = "shared" }, sharedLevel: "Admin");

        read.Success.ShouldBeFalse();
        read.ErrorMessage!.ShouldContain("Taskboard tool");
        write.Success.ShouldBeFalse();
        File.Exists(Path.Combine(tasks, "t-2.md")).ShouldBeFalse();
        list.Content.ShouldNotContain("tasks/");
    }

    [Fact]
    public async Task Without_units_the_task_files_stay_as_they_were()
    {
        var tasks = Path.Combine(_agents, "SharedWorkspace", "tasks");
        Directory.CreateDirectory(tasks);
        File.WriteAllText(Path.Combine(tasks, "t-1.md"), "task");

        var read = await Run("ads", new { action = "read", workspace = "shared", path = "tasks/t-1.md" }, sharedLevel: "Read", withUnits: false);

        read.Success.ShouldBeTrue(read.ErrorMessage);
    }

    [Fact]
    public async Task Without_an_organisation_only_personal_and_shared_exist()
    {
        var context = new AgentToolContext(
            "solo", "inst", new Dictionary<string, object?>(), new NullStateStore(), NullLogger.Instance, CancellationToken.None,
            WorkspacePath: Path.Combine(_agents, "solo"), SharedWorkspacePath: Path.Combine(_agents, "SharedWorkspace"));
        Directory.CreateDirectory(context.WorkspacePath!);

        var result = await _tool.ExecuteAsync(
            JsonSerializer.SerializeToElement(new { action = "list", workspace = "unit" }), context, CancellationToken.None);

        result.ErrorMessage!.ShouldBe("Unknown workspace 'unit'. You can use: personal.");
    }
}