using System.Collections.ObjectModel;
using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Ui.Services;
using ClaudeDo.Ui.ViewModels.Islands;
using Microsoft.EntityFrameworkCore;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Ui.Tests.ViewModels;

public class DetailsIslandConflictSeamTests : IDisposable
{
    private readonly string _dbPath;

    public DetailsIslandConflictSeamTests()
    {
        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_conflict_seam_test_{Guid.NewGuid():N}.db");
        using var ctx = NewContext();
        ctx.Database.EnsureCreated();
    }

    public void Dispose()
    {
        try { File.Delete(_dbPath); } catch { }
        try { File.Delete(_dbPath + "-wal"); } catch { }
        try { File.Delete(_dbPath + "-shm"); } catch { }
    }

    private ClaudeDoDbContext NewContext()
    {
        var opts = new DbContextOptionsBuilder<ClaudeDoDbContext>()
            .UseSqlite($"Data Source={_dbPath}")
            .Options;
        return new ClaudeDoDbContext(opts);
    }




    private sealed class ConflictApproveWorkerClient : StubWorkerClient
    {
        public override bool IsConnected => true;
        public override Task<MergeResultDto?> ApproveReviewAsync(string taskId, string targetBranch, bool autostash = false) =>
            Task.FromResult<MergeResultDto?>(new MergeResultDto("conflict", new[] { "a.cs" }, null));
    }

    private DetailsIslandViewModel BuildVm(StubWorkerClient worker, MergeCoordinator merge)
    {
        var factory = new TestDbFactory(NewContext);
        return new DetailsIslandViewModel(factory, worker, new NullServiceProvider(), merge);
    }

    [Fact]
    public async Task ApproveReview_OnConflict_InvokesConflictResolutionSeam()
    {
        const string taskId = "task-conflict-1";

        string? capturedTaskId = null;
        string? capturedTarget = null;
        var coordinator = new MergeCoordinator
        {
            Handler = (tid, target, _) =>
            {
                capturedTaskId = tid;
                capturedTarget = target;
                return Task.CompletedTask;
            },
        };

        var vm = BuildVm(new ConflictApproveWorkerClient(), coordinator);
        vm.Bind(new TaskRowViewModel { Id = taskId, Status = TaskStatus.WaitingForReview });
        vm.Merge.SelectedMergeTarget = "main";

        await vm.ApproveReviewCommand.ExecuteAsync(null);

        Assert.Equal(taskId, capturedTaskId);
        Assert.Equal("main", capturedTarget);
    }

    /// <summary>Models the worker: a dirty target refuses the merge unless the caller consented to the stash.</summary>
    private sealed class DirtyTargetConflictWorkerClient : StubWorkerClient
    {
        public override bool IsConnected => true;
        public override Task<MergeResultDto?> ApproveReviewAsync(string taskId, string targetBranch, bool autostash = false) =>
            Task.FromResult<MergeResultDto?>(autostash
                ? new MergeResultDto("conflict", new[] { "a.cs" }, null)
                : new MergeResultDto("dirty_target", Array.Empty<string>(), "target working tree has uncommitted changes"));
    }

    [Fact]
    public async Task ApproveReview_StashRetryEndsInConflict_HandsTheStashConsentToTheResolver()
    {
        // Regression: the resolver restarts the merge itself; without the consent it hit the same
        // dirty target, got "dirty_target" and silently never opened.
        bool? capturedAutostash = null;
        var coordinator = new MergeCoordinator
        {
            Handler = (_, _, autostash) => { capturedAutostash = autostash; return Task.CompletedTask; },
        };

        var vm = BuildVm(new DirtyTargetConflictWorkerClient(), coordinator);
        vm.Dialogs = new RecordingDialogService { ConfirmResult = true };
        vm.Bind(new TaskRowViewModel { Id = "task-dirty-1", Status = TaskStatus.WaitingForReview });
        vm.Merge.SelectedMergeTarget = "main";

        await vm.ApproveReviewCommand.ExecuteAsync(null);

        Assert.True(capturedAutostash);
    }
}