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 TestDbFactory : IDbContextFactory<ClaudeDoDbContext>
    {
        private readonly Func<ClaudeDoDbContext> _create;
        public TestDbFactory(Func<ClaudeDoDbContext> create) => _create = create;
        public ClaudeDoDbContext CreateDbContext() => _create();
    }

    private sealed class NullServiceProvider : IServiceProvider
    {
        public object? GetService(Type serviceType) => null;
    }

    private sealed class StubNotesApi : ClaudeDo.Ui.Services.Interfaces.INotesApi
    {
        public Task<List<ClaudeDo.Ui.Services.DailyNoteDto>> ListAsync(DateOnly day) =>
            Task.FromResult(new List<ClaudeDo.Ui.Services.DailyNoteDto>());
        public Task<ClaudeDo.Ui.Services.DailyNoteDto?> AddAsync(DateOnly day, string text) =>
            Task.FromResult<ClaudeDo.Ui.Services.DailyNoteDto?>(null);
        public Task UpdateAsync(string id, string text) => Task.CompletedTask;
        public Task DeleteAsync(string id) => Task.CompletedTask;
    }

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

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

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

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

        string? capturedTaskId = null;
        string? capturedTarget = null;
        vm.RequestConflictResolution = (tid, target) =>
        {
            capturedTaskId = tid;
            capturedTarget = target;
            return Task.CompletedTask;
        };

        await vm.ApproveReviewCommand.ExecuteAsync(null);

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