using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Worker.Planning;
using ClaudeDo.Worker.Tests.Infrastructure;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.Planning;

public sealed class PlanningSessionManagerTests : IDisposable
{
    private readonly DbFixture _db = new();
    private readonly ClaudeDoDbContext _ctx;
    private readonly TaskRepository _tasks;
    private readonly ListRepository _lists;
    private readonly string _rootDir;
    private readonly PlanningSessionManager _sut;

    public PlanningSessionManagerTests()
    {
        _ctx = _db.CreateContext();
        _tasks = new TaskRepository(_ctx);
        _lists = new ListRepository(_ctx);
        _rootDir = Path.Combine(Path.GetTempPath(), $"cd_planning_{Guid.NewGuid():N}");
        _sut = new PlanningSessionManager(_tasks, _lists, _rootDir);
    }

    public void Dispose()
    {
        _ctx.Dispose();
        _db.Dispose();
        try { Directory.Delete(_rootDir, recursive: true); } catch { /* ignore */ }
    }

    private async Task<(string listId, string workingDir)> SeedListAsync()
    {
        var listId = Guid.NewGuid().ToString();
        var wd = Path.Combine(Path.GetTempPath(), $"cd_wd_{Guid.NewGuid():N}");
        Directory.CreateDirectory(wd);
        await _lists.AddAsync(new ListEntity
        {
            Id = listId,
            Name = "Test",
            WorkingDir = wd,
            CreatedAt = DateTime.UtcNow,
        });
        return (listId, wd);
    }

    private async Task<TaskEntity> SeedManualTaskAsync(string listId)
    {
        var t = new TaskEntity
        {
            Id = Guid.NewGuid().ToString(),
            ListId = listId,
            Title = "Brainstorm auth",
            Description = "- review tokens\n- plan rollout",
            Status = TaskStatus.Manual,
            CreatedAt = DateTime.UtcNow,
            CommitType = "feat",
        };
        await _tasks.AddAsync(t);
        return t;
    }

    [Fact]
    public async Task StartAsync_CreatesSessionFiles_AndTransitionsTaskToPlanning()
    {
        var (listId, wd) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);

        var ctx = await _sut.StartAsync(parent.Id, CancellationToken.None);

        Assert.Equal(parent.Id, ctx.ParentTaskId);
        Assert.Equal(wd, ctx.WorkingDir);
        Assert.True(File.Exists(ctx.Files.McpConfigPath));
        Assert.True(File.Exists(ctx.Files.SystemPromptPath));
        Assert.True(File.Exists(ctx.Files.InitialPromptPath));

        var mcp = await File.ReadAllTextAsync(ctx.Files.McpConfigPath);
        Assert.Contains("\"type\": \"http\"", mcp);
        Assert.Contains("Bearer ", mcp);

        var initial = await File.ReadAllTextAsync(ctx.Files.InitialPromptPath);
        Assert.Contains("Brainstorm auth", initial);
        Assert.Contains("review tokens", initial);

        var loaded = await _tasks.GetByIdAsync(parent.Id);
        Assert.Equal(TaskStatus.Planning, loaded!.Status);
        Assert.NotNull(loaded.PlanningSessionToken);
    }

    [Fact]
    public async Task StartAsync_TaskNotManual_Throws()
    {
        var (listId, _) = await SeedListAsync();
        var queuedTask = new TaskEntity
        {
            Id = Guid.NewGuid().ToString(),
            ListId = listId,
            Title = "x",
            Status = TaskStatus.Queued,
            CreatedAt = DateTime.UtcNow,
            CommitType = "feat",
        };
        await _tasks.AddAsync(queuedTask);

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            _sut.StartAsync(queuedTask.Id, CancellationToken.None));
    }

    [Fact]
    public async Task StartAsync_ChildTask_Throws()
    {
        var (listId, _) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);
        await _tasks.SetPlanningStartedAsync(parent.Id, "t");
        var child = await _tasks.CreateChildAsync(parent.Id, "c", null, null, null);

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            _sut.StartAsync(child.Id, CancellationToken.None));
    }

    [Fact]
    public async Task ResumeAsync_ReturnsExistingSessionDetails()
    {
        var (listId, wd) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);
        var startCtx = await _sut.StartAsync(parent.Id, CancellationToken.None);
        await _tasks.UpdatePlanningSessionIdAsync(parent.Id, "claude-session-42");

        var resumeCtx = await _sut.ResumeAsync(parent.Id, CancellationToken.None);

        Assert.Equal(parent.Id, resumeCtx.ParentTaskId);
        Assert.Equal(wd, resumeCtx.WorkingDir);
        Assert.Equal("claude-session-42", resumeCtx.ClaudeSessionId);
        Assert.Equal(startCtx.Files.McpConfigPath, resumeCtx.McpConfigPath);
        Assert.True(File.Exists(resumeCtx.McpConfigPath));
    }

    [Fact]
    public async Task ResumeAsync_NotPlanning_Throws()
    {
        var (listId, _) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);
        // did not start
        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            _sut.ResumeAsync(parent.Id, CancellationToken.None));
    }

    [Fact]
    public async Task ResumeAsync_NoClaudeSessionId_Throws()
    {
        var (listId, _) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);
        await _sut.StartAsync(parent.Id, CancellationToken.None);
        // UpdatePlanningSessionIdAsync not called

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            _sut.ResumeAsync(parent.Id, CancellationToken.None));
    }

    [Fact]
    public async Task FinalizeAsync_PromotesDraftsAndMarksPlanned()
    {
        var (listId, _) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);
        await _sut.StartAsync(parent.Id, CancellationToken.None);
        await _tasks.CreateChildAsync(parent.Id, "c1", null, null, null);
        await _tasks.CreateChildAsync(parent.Id, "c2", null, null, null);

        var count = await _sut.FinalizeAsync(parent.Id, queueAgentTasks: true, CancellationToken.None);

        Assert.Equal(2, count);
        var loaded = await _tasks.GetByIdAsync(parent.Id);
        Assert.Equal(TaskStatus.Planned, loaded!.Status);
    }

    [Fact]
    public async Task GetPendingDraftCountAsync_ReturnsDraftCount()
    {
        var (listId, _) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);
        await _sut.StartAsync(parent.Id, CancellationToken.None);
        await _tasks.CreateChildAsync(parent.Id, "c1", null, null, null);
        await _tasks.CreateChildAsync(parent.Id, "c2", null, null, null);
        await _tasks.CreateChildAsync(parent.Id, "c3", null, null, null);

        var n = await _sut.GetPendingDraftCountAsync(parent.Id, CancellationToken.None);

        Assert.Equal(3, n);
    }

    [Fact]
    public async Task DiscardAsync_DeletesSessionDirAndResetsTask()
    {
        var (listId, _) = await SeedListAsync();
        var parent = await SeedManualTaskAsync(listId);
        var startCtx = await _sut.StartAsync(parent.Id, CancellationToken.None);
        Assert.True(Directory.Exists(startCtx.Files.SessionDirectory));

        await _sut.DiscardAsync(parent.Id, CancellationToken.None);

        Assert.False(Directory.Exists(startCtx.Files.SessionDirectory));
        var loaded = await _tasks.GetByIdAsync(parent.Id);
        Assert.Equal(TaskStatus.Manual, loaded!.Status);
        Assert.Null(loaded.PlanningSessionToken);
    }
}