using System.Collections.ObjectModel;
using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Ui.Localization;
using ClaudeDo.Ui.Services;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Microsoft.EntityFrameworkCore;

namespace ClaudeDo.Ui.ViewModels.Modals;

public sealed partial class ListSettingsModalViewModel : ViewModelBase
{
    private readonly WorkerClient _worker;
    private readonly IDbContextFactory<ClaudeDoDbContext> _dbFactory;

    public string ListId { get; set; } = "";

    // True after the list was deleted, so the caller reloads the list nav instead of refreshing the row.
    public bool Deleted { get; private set; }

    // Wired by the view to prompt yes/no before deleting and to surface a blocking-FK error.
    public Func<string, Task<bool>>? ConfirmAsync { get; set; }
    public Func<string, Task>? ShowErrorAsync { get; set; }

    [ObservableProperty] private string _name = "";
    [ObservableProperty] private string _workingDir = "";
    [ObservableProperty] private string _defaultCommitType = CommitTypeRegistry.DefaultType;

    [ObservableProperty] private string? _selectedModel;          // null = inherit from global
    [ObservableProperty] private decimal? _maxTurns;              // null = inherit from global
    [ObservableProperty] private string _modelInheritedHint = ""; // resolved value placeholder, e.g. "sonnet"
    [ObservableProperty] private string _modelBadge = "";
    [ObservableProperty] private string _turnsInheritedHint = "";
    [ObservableProperty] private string _turnsBadge = "";
    [ObservableProperty] private string _agentBadge = "";

    [ObservableProperty] private string _systemPrompt = "";
    [ObservableProperty] private AgentInfo? _selectedAgent;

    private string _globalModel = ModelRegistry.DefaultAlias;
    private int _globalMaxTurns = 100;

    public ObservableCollection<string> ModelOptions { get; } = new(ModelRegistry.Aliases);

    public ObservableCollection<string> CommitTypeOptions { get; } = new(CommitTypeRegistry.Types);

    public ObservableCollection<AgentInfo> Agents { get; } = new();

    public Action? CloseAction { get; set; }

    public ListSettingsModalViewModel(WorkerClient worker, IDbContextFactory<ClaudeDoDbContext> dbFactory)
    {
        _worker = worker;
        _dbFactory = dbFactory;
    }

    partial void OnSelectedModelChanged(string? value) => RecomputeModelBadge();
    partial void OnMaxTurnsChanged(decimal? value) => RecomputeTurnsBadge();
    partial void OnSelectedAgentChanged(AgentInfo? value) => RecomputeAgentBadge();

    private void RecomputeModelBadge()
    {
        ModelInheritedHint = _globalModel;
        ModelBadge = !string.IsNullOrWhiteSpace(SelectedModel)
            ? Loc.T("settings.inherit.overrideBadge")
            : Loc.T("settings.inherit.inheritedFromGlobal");
    }

    private void RecomputeTurnsBadge()
    {
        TurnsInheritedHint = _globalMaxTurns.ToString();
        TurnsBadge = MaxTurns is not null
            ? Loc.T("settings.inherit.overrideBadge")
            : Loc.T("settings.inherit.inheritedFromGlobal");
    }

    private void RecomputeAgentBadge()
    {
        var overridden = SelectedAgent is not null && !string.IsNullOrWhiteSpace(SelectedAgent.Path);
        AgentBadge = overridden
            ? Loc.T("settings.inherit.overrideBadge")
            : Loc.T("settings.inherit.inheritedFromGlobal");
    }

    public async Task LoadAsync(
        string listId,
        string name,
        string? workingDir,
        string defaultCommitType,
        CancellationToken ct = default)
    {
        ListId = listId;
        Name = name;
        WorkingDir = workingDir ?? "";
        DefaultCommitType = string.IsNullOrWhiteSpace(defaultCommitType) ? CommitTypeRegistry.DefaultType : defaultCommitType;

        Agents.Clear();
        Agents.Add(new AgentInfo("(none)", "", ""));
        var agents = await _worker.GetAgentsAsync();
        foreach (var a in agents) Agents.Add(a);

        var config = await _worker.GetListConfigAsync(listId);

        var app = await _worker.GetAppSettingsAsync();
        _globalModel = app?.DefaultModel ?? ModelRegistry.DefaultAlias;
        _globalMaxTurns = app?.DefaultMaxTurns ?? 100;

        SelectedModel = string.IsNullOrWhiteSpace(config?.Model) ? null : config!.Model!;
        MaxTurns = config?.MaxTurns is int mt ? mt : (decimal?)null;
        SystemPrompt = config?.SystemPrompt ?? "";
        SelectedAgent = string.IsNullOrWhiteSpace(config?.AgentPath)
            ? Agents[0]
            : (Agents.FirstOrDefault(a => a.Path == config!.AgentPath) ?? Agents[0]);

        RecomputeModelBadge();
        RecomputeTurnsBadge();
        RecomputeAgentBadge();
    }

    [RelayCommand]
    private async Task SaveAsync()
    {
        var model = string.IsNullOrWhiteSpace(SelectedModel) ? null : SelectedModel;
        var sp = string.IsNullOrWhiteSpace(SystemPrompt) ? null : SystemPrompt;
        var ap = SelectedAgent is null || string.IsNullOrWhiteSpace(SelectedAgent.Path) ? null : SelectedAgent.Path;
        var turns = MaxTurns is decimal d ? (int?)d : null;

        await _worker.UpdateListAsync(new UpdateListDto(
            ListId,
            string.IsNullOrWhiteSpace(Name) ? Loc.T("vm.listSettings.untitled") : Name,
            string.IsNullOrWhiteSpace(WorkingDir) ? null : WorkingDir,
            DefaultCommitType));

        await _worker.UpdateListConfigAsync(new UpdateListConfigDto(ListId, model, sp, ap, turns));

        CloseAction?.Invoke();
    }

    [RelayCommand]
    private async Task DeleteAsync()
    {
        var displayName = string.IsNullOrWhiteSpace(Name) ? Loc.T("vm.listSettings.untitled") : Name;
        if (ConfirmAsync is not null)
        {
            var ok = await ConfirmAsync($"Delete list \"{displayName}\" and all its tasks? This cannot be undone.");
            if (!ok) return;
        }

        try
        {
            await using var ctx = await _dbFactory.CreateDbContextAsync();
            var lists = new ListRepository(ctx);
            await lists.DeleteAsync(ListId);
        }
        catch (Exception ex) when (
            (ex is Microsoft.Data.Sqlite.SqliteException
                || ex.InnerException is Microsoft.Data.Sqlite.SqliteException)
            && (ex.Message.Contains("FOREIGN KEY", StringComparison.OrdinalIgnoreCase)
                || ex.InnerException?.Message.Contains("FOREIGN KEY", StringComparison.OrdinalIgnoreCase) == true))
        {
            if (ShowErrorAsync is not null)
                await ShowErrorAsync("This list has planning sessions with child tasks. Discard those first, then delete the list.");
            return;
        }

        Deleted = true;
        CloseAction?.Invoke();
    }

    [RelayCommand]
    private void Cancel() => CloseAction?.Invoke();

    [RelayCommand] private void ResetModel() => SelectedModel = null;
    [RelayCommand] private void ResetTurns() => MaxTurns = null;
    [RelayCommand] private void ResetAgent() => SelectedAgent = Agents.Count > 0 ? Agents[0] : null;

    [RelayCommand]
    private void ResetAgentSettings()
    {
        SelectedModel = null;
        MaxTurns = null;
        SystemPrompt = "";
        SelectedAgent = Agents.Count > 0 ? Agents[0] : null;
    }
}