using System.Collections.ObjectModel;
using ClaudeDo.Data;
using ClaudeDo.Data.Models;
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 DetailsIslandPlanningTests : IDisposable
{
    private readonly string _dbPath;

    public DetailsIslandPlanningTests()
    {
        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_details_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 FakeWorkerClient : StubWorkerClient
    {
        public MergeTargetsDto? MergeTargetsResult { get; set; }

        public override Task<MergeTargetsDto?> GetMergeTargetsAsync(string taskId) => Task.FromResult(MergeTargetsResult);
    }

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

    // Connected worker whose review calls fail the way the hub does when the task
    // is no longer WaitingForReview (e.g. after "Merge all" folded the parent).
    private sealed class ThrowingReviewWorkerClient : StubWorkerClient
    {
        public override bool IsConnected => true;
        public override Task<MergeResultDto?> ApproveReviewAsync(string taskId, string targetBranch) =>
            Task.FromException<MergeResultDto?>(new InvalidOperationException("Task is not waiting for review; cannot approve."));
    }

    // ── Review-action resilience: a failing hub call must not crash the app ───

    [Fact]
    public async Task ApproveReview_WhenWorkerThrows_DoesNotPropagate()
    {
        var vm = BuildVm(new ThrowingReviewWorkerClient());
        vm.Bind(new TaskRowViewModel { Id = "p", Status = TaskStatus.WaitingForReview });

        // Before the fix this surfaced the HubException as an unobserved
        // async-void exception from the command, crashing the process.
        var ex = await Record.ExceptionAsync(() => vm.ApproveReviewCommand.ExecuteAsync(null));

        Assert.Null(ex);
    }

    // ── Branch-load test exercising the VM via Bind ──────────────────────────

    [Fact]
    public async Task MergeTargetBranches_LoadedFromWorkerOnPlanningParent()
    {
        // Seed a Planning parent with one child that has a worktree
        const string parentId = "parent-1";
        const string childId  = "child-1";
        const string listId   = "list-1";

        await using (var ctx = NewContext())
        {
            ctx.Lists.Add(new ListEntity { Id = listId, Name = "L", CreatedAt = DateTime.UtcNow });
            ctx.Tasks.Add(new TaskEntity
            {
                Id = parentId, ListId = listId, Title = "Parent",
                Status = TaskStatus.Idle, PlanningPhase = PlanningPhase.Active,
                CreatedAt = DateTime.UtcNow,
            });
            ctx.Tasks.Add(new TaskEntity
            {
                Id = childId, ListId = listId, Title = "Child",
                Status = TaskStatus.Done, ParentTaskId = parentId, CreatedAt = DateTime.UtcNow,
            });
            ctx.Set<WorktreeEntity>().Add(new WorktreeEntity
            {
                TaskId = childId, Path = "/tmp/wt", BranchName = "branch",
                BaseCommit = "abc", CreatedAt = DateTime.UtcNow,
            });
            await ctx.SaveChangesAsync();
        }

        var fake = new FakeWorkerClient
        {
            MergeTargetsResult = new MergeTargetsDto("main", new[] { "main", "dev" }),
        };

        var vm = BuildVm(fake);

        // Bind triggers BindAsync → LoadPlanningChildrenAsync → GetMergeTargetsAsync
        var parentRow = new TaskRowViewModel { Id = parentId };
        parentRow.Status = TaskStatus.Idle;
        parentRow.PlanningPhase = PlanningPhase.Active;
        vm.Bind(parentRow);

        // Wait for the background load to settle
        var deadline = DateTime.UtcNow.AddSeconds(5);
        while (DateTime.UtcNow < deadline && vm.MergeTargetBranches.Count == 0)
            await Task.Delay(20);

        Assert.Contains("main", vm.MergeTargetBranches);
        Assert.Contains("dev",  vm.MergeTargetBranches);
        Assert.Equal("main", vm.SelectedMergeTarget);
    }
}