using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using Microsoft.EntityFrameworkCore;

namespace ClaudeDo.Data.Tests;

public sealed class ListFolderTests : IDisposable
{
    private readonly string _dbPath;
    private readonly DbContextOptions<ClaudeDoDbContext> _options;

    public ListFolderTests()
    {
        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_folders_{Guid.NewGuid():N}.db");
        _options = new DbContextOptionsBuilder<ClaudeDoDbContext>()
            .UseSqlite($"Data Source={_dbPath}")
            .Options;

        using var ctx = new ClaudeDoDbContext(_options);
        ctx.Database.EnsureCreated();
    }

    public void Dispose()
    {
        foreach (var suffix in new[] { "", "-wal", "-shm" })
            try { File.Delete(_dbPath + suffix); } catch { }
    }

    private ClaudeDoDbContext Open() => new(_options);

    private static ListFolderEntity NewFolder(string id, string name = "Group") =>
        new() { Id = id, Name = name, CreatedAt = DateTime.UtcNow };

    [Fact]
    public async Task Deleting_a_folder_keeps_its_lists_and_moves_them_to_the_top_level()
    {
        await using (var ctx = Open())
        {
            var repo = new ListRepository(ctx);
            await repo.AddFolderAsync(NewFolder("f1"));
            await repo.AddAsync(new ListEntity { Id = "l1", Name = "Inside", CreatedAt = DateTime.UtcNow, FolderId = "f1" });
        }

        await using (var ctx = Open())
            await new ListRepository(ctx).DeleteFolderAsync("f1");

        await using (var ctx = Open())
        {
            var list = await ctx.Lists.AsNoTracking().FirstAsync(l => l.Id == "l1");
            Assert.Null(list.FolderId);
            Assert.Empty(await ctx.ListFolders.AsNoTracking().ToListAsync());
        }
    }

    [Fact]
    public async Task RenameFolderAsync_keeps_sort_order_and_collapse_state()
    {
        // The whole reason it patches instead of Update()-ing a rebuilt entity: a rename must not
        // silently unfold the folder or shuffle it to the top.
        await using (var ctx = Open())
        {
            var repo = new ListRepository(ctx);
            await repo.AddFolderAsync(NewFolder("f1", "First"));
            await repo.AddFolderAsync(NewFolder("f2", "Second"));
            await repo.SetFolderCollapsedAsync("f2", true);
        }

        await using (var ctx = Open())
            await new ListRepository(ctx).RenameFolderAsync("f2", "Renamed", "Star");

        await using (var ctx = Open())
        {
            var folder = await ctx.ListFolders.AsNoTracking().FirstAsync(f => f.Id == "f2");
            Assert.Equal("Renamed", folder.Name);
            Assert.Equal("Star", folder.Icon);
            Assert.True(folder.IsCollapsed);
            Assert.Equal(1, folder.SortOrder);
        }
    }

    [Fact]
    public async Task SetListFolderAsync_moves_a_list_in_and_back_out()
    {
        await using (var ctx = Open())
        {
            var repo = new ListRepository(ctx);
            await repo.AddFolderAsync(NewFolder("f1"));
            await repo.AddAsync(new ListEntity { Id = "l1", Name = "Roaming", CreatedAt = DateTime.UtcNow });
        }

        await using (var ctx = Open())
            await new ListRepository(ctx).SetListFolderAsync("l1", "f1");

        await using (var ctx = Open())
            Assert.Equal("f1", (await ctx.Lists.AsNoTracking().FirstAsync(l => l.Id == "l1")).FolderId);

        await using (var ctx = Open())
            await new ListRepository(ctx).SetListFolderAsync("l1", null);

        await using (var ctx = Open())
            Assert.Null((await ctx.Lists.AsNoTracking().FirstAsync(l => l.Id == "l1")).FolderId);
    }

    [Fact]
    public async Task ReorderSidebarAsync_numbers_folders_and_lists_in_one_sequence()
    {
        await using var ctx = Open();
        var repo = new ListRepository(ctx);
        await repo.AddFolderAsync(NewFolder("f1"));
        await repo.AddAsync(new ListEntity { Id = "inside", Name = "Inside", CreatedAt = DateTime.UtcNow, FolderId = "f1" });
        await repo.AddAsync(new ListEntity { Id = "top", Name = "Top", CreatedAt = DateTime.UtcNow });

        // Sidebar: the top-level list above the folder, whose one child follows the folder.
        await repo.ReorderSidebarAsync([("top", false), ("f1", true), ("inside", false)]);

        Assert.Equal(0, (await repo.GetByIdAsync("top"))!.SortOrder);
        Assert.Equal(1, (await repo.GetFoldersAsync()).Single().SortOrder);
        Assert.Equal(2, (await repo.GetByIdAsync("inside"))!.SortOrder);
    }

    [Fact]
    public async Task AddAsync_appends_past_the_folders_too()
    {
        await using var ctx = Open();
        var repo = new ListRepository(ctx);
        await repo.AddFolderAsync(NewFolder("f1"));
        await repo.AddFolderAsync(NewFolder("f2"));
        await repo.AddAsync(new ListEntity { Id = "l1", Name = "Fresh", CreatedAt = DateTime.UtcNow });

        // 2, not 0 — a new list must not jump above the existing folders on the next load.
        Assert.Equal(2, (await repo.GetByIdAsync("l1"))!.SortOrder);
    }

    [Fact]
    public async Task AddFolderAsync_appends_in_creation_order()
    {
        await using var ctx = Open();
        var repo = new ListRepository(ctx);
        await repo.AddFolderAsync(NewFolder("f1", "One"));
        await repo.AddFolderAsync(NewFolder("f2", "Two"));

        var folders = await repo.GetFoldersAsync();
        Assert.Equal(["One", "Two"], folders.Select(f => f.Name));
        Assert.Equal([0, 1], folders.Select(f => f.SortOrder));
    }

    [Fact]
    public async Task SetFolderParentAsync_nests_a_folder_and_moves_it_back_out()
    {
        await using (var ctx = Open())
        {
            var repo = new ListRepository(ctx);
            await repo.AddFolderAsync(NewFolder("parent"));
            await repo.AddFolderAsync(NewFolder("child"));
        }

        await using (var ctx = Open())
            await new ListRepository(ctx).SetFolderParentAsync("child", "parent");

        await using (var ctx = Open())
            Assert.Equal("parent", (await ctx.ListFolders.AsNoTracking().FirstAsync(f => f.Id == "child")).ParentFolderId);

        await using (var ctx = Open())
            await new ListRepository(ctx).SetFolderParentAsync("child", null);

        await using (var ctx = Open())
            Assert.Null((await ctx.ListFolders.AsNoTracking().FirstAsync(f => f.Id == "child")).ParentFolderId);
    }

    [Fact]
    public async Task Deleting_a_folder_keeps_its_subfolder_and_moves_it_to_the_top_level()
    {
        await using (var ctx = Open())
        {
            var repo = new ListRepository(ctx);
            await repo.AddFolderAsync(NewFolder("parent"));
            await repo.AddFolderAsync(NewFolder("child"));
            await repo.SetFolderParentAsync("child", "parent");
        }

        await using (var ctx = Open())
            await new ListRepository(ctx).DeleteFolderAsync("parent");

        await using (var ctx = Open())
        {
            var child = await ctx.ListFolders.AsNoTracking().SingleAsync();
            Assert.Equal("child", child.Id);
            Assert.Null(child.ParentFolderId);
        }
    }
}