using Microsoft.AspNetCore.Mvc;
using PlanTempus.Application.Features.Localization.Services;

namespace PlanTempus.Application.Features.Dashboard.Components;

/// <summary>
/// ViewComponent for rendering a stat card on the dashboard.
/// </summary>
public class StatCardViewComponent : ViewComponent
{
    private readonly ILocalizationService _localization;

    public StatCardViewComponent(ILocalizationService localization)
    {
        _localization = localization;
    }

    public IViewComponentResult Invoke(string key)
    {
        var model = StatCardCatalog.Get(key, _localization);
        return View(model);
    }
}

/// <summary>
/// ViewModel for the StatCard component.
/// </summary>
public class StatCardViewModel
{
    public required string Key { get; init; }
    public required string Value { get; init; }
    public required string Label { get; init; }
    public string? TrendText { get; init; }
    public string? TrendIcon { get; init; }
    public string? TrendDirection { get; init; }
    public string? Variant { get; init; }
    public bool HasTrend => !string.IsNullOrEmpty(TrendText);
}

/// <summary>
/// Internal data for stat cards (uses localization keys).
/// </summary>
internal class StatCardData
{
    public required string Key { get; init; }
    public required string Value { get; init; }
    public required string LabelKey { get; init; }
    public string? TrendTextKey { get; init; }
    public string? TrendIcon { get; init; }
    public string? TrendDirection { get; init; }
    public string? Variant { get; init; }
}

/// <summary>
/// Catalog of available stat cards with their data.
/// </summary>
public static class StatCardCatalog
{
    private static readonly Dictionary<string, StatCardData> Cards = new()
    {
        ["bookings-today"] = new StatCardData
        {
            Key = "bookings-today",
            Value = "12",
            LabelKey = "dashboard.stats.bookingsToday",
            TrendTextKey = "dashboard.stats.bookingsTrend",
            TrendIcon = "ph-check-circle",
            TrendDirection = "up",
            Variant = "highlight"
        },
        ["expected-revenue"] = new StatCardData
        {
            Key = "expected-revenue",
            Value = "8.450 kr",
            LabelKey = "dashboard.stats.expectedRevenue",
            TrendTextKey = "dashboard.stats.revenueTrend",
            TrendIcon = "ph-trend-up",
            TrendDirection = "up",
            Variant = "success"
        },
        ["occupancy-rate"] = new StatCardData
        {
            Key = "occupancy-rate",
            Value = "78%",
            LabelKey = "dashboard.stats.occupancyRate",
            TrendTextKey = "dashboard.stats.occupancyTrend",
            TrendIcon = "ph-trend-up",
            TrendDirection = "up",
            Variant = null
        },
        ["needs-attention"] = new StatCardData
        {
            Key = "needs-attention",
            Value = "4",
            LabelKey = "dashboard.stats.needsAttention",
            TrendTextKey = null,
            TrendIcon = null,
            TrendDirection = null,
            Variant = "warning"
        }
    };

    public static StatCardViewModel Get(string key, ILocalizationService localization)
    {
        if (!Cards.TryGetValue(key, out var card))
            throw new KeyNotFoundException($"StatCard with key '{key}' not found");

        return new StatCardViewModel
        {
            Key = card.Key,
            Value = card.Value,
            Label = localization.Get(card.LabelKey),
            TrendText = card.TrendTextKey != null ? localization.Get(card.TrendTextKey) : null,
            TrendIcon = card.TrendIcon,
            TrendDirection = card.TrendDirection,
            Variant = card.Variant
        };
    }

    public static IEnumerable<string> AllKeys => Cards.Keys;
}