using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace Billing.Languages
{
    internal class Resource
    {
        public static string Ok => Text(nameof(Ok));
        public static string Cancel => Text(nameof(Cancel));
        public static string Yes => Text(nameof(Yes));
        public static string No => Text(nameof(No));
        public static string ConfirmDeleteAccount => Text(nameof(ConfirmDeleteAccount));
        public static string ConfirmDeleteBill => Text(nameof(ConfirmDeleteBill));
        public static string TitleDateFormat => Text(nameof(TitleDateFormat));
        public static string TitleShortDateFormat => Text(nameof(TitleShortDateFormat));
        public static string DateRangeFormat => Text(nameof(DateRangeFormat));
        public static string Custom => Text(nameof(Custom));
        public static string Monthly => Text(nameof(Monthly));
        public static string Today => Text(nameof(Today));
        public static string PastMonth => Text(nameof(PastMonth));
        public static string PastQuarter => Text(nameof(PastQuarter));
        public static string PastSixMonths => Text(nameof(PastSixMonths));
        public static string PastYear => Text(nameof(PastYear));
        public static string Total => Text(nameof(Total));
        public static string Cash => Text(nameof(Cash));
        public static string CreditCard => Text(nameof(CreditCard));
        public static string DebitCard => Text(nameof(DebitCard));
        public static string ElecAccount => Text(nameof(ElecAccount));
        public static string AddBill => Text(nameof(AddBill));
        public static string EditBill => Text(nameof(EditBill));
        public static string AddAccount => Text(nameof(AddAccount));
        public static string EditAccount => Text(nameof(EditAccount));
        public static string AccountRequired => Text(nameof(AccountRequired));
        public static string NeedAccount => Text(nameof(NeedAccount));
        public static string AmountRequired => Text(nameof(AmountRequired));
        public static string Income => Text(nameof(Income));
        public static string Spending => Text(nameof(Spending));
        public static string LastSelected => Text(nameof(LastSelected));
        public static string Recent => Text(nameof(Recent));
        public static string CategoryManage => Text(nameof(CategoryManage));
        public static string AddCategory => Text(nameof(AddCategory));
        public static string ConfirmDeleteCategory => Text(nameof(ConfirmDeleteCategory));
        public static string ShareLogs => Text(nameof(ShareLogs));
        public static string ManyRecords => Text(nameof(ManyRecords));
        public static string SendEmail => Text(nameof(SendEmail));
        public static string HowToShareDiagnostic => Text(nameof(HowToShareDiagnostic));

        #region Categories
        public static string Clothing => Text(nameof(Clothing));
        public static string Food => Text(nameof(Food));
        public static string Drinks => Text(nameof(Drinks));
        public static string Daily => Text(nameof(Daily));
        public static string Trans => Text(nameof(Trans));
        public static string Entertainment => Text(nameof(Entertainment));
        public static string Learn => Text(nameof(Learn));
        public static string Medical => Text(nameof(Medical));
        public static string OtherSpending => Text(nameof(OtherSpending));
        public static string Salary => Text(nameof(Salary));
        public static string Earnings => Text(nameof(Earnings));
        public static string Bonus => Text(nameof(Bonus));
        public static string OtherIncome => Text(nameof(OtherIncome));
        public static string Jewellery => Text(nameof(Jewellery));
        public static string Cosmetics => Text(nameof(Cosmetics));
        public static string Brunch => Text(nameof(Brunch));
        public static string Dinner => Text(nameof(Dinner));
        public static string Fruit => Text(nameof(Fruit));
        public static string UtilityBill => Text(nameof(UtilityBill));
        public static string PropertyFee => Text(nameof(PropertyFee));
        public static string Rent => Text(nameof(Rent));
        public static string Maintenance => Text(nameof(Maintenance));
        public static string Bus => Text(nameof(Bus));
        public static string LightRail => Text(nameof(LightRail));
        public static string Taxi => Text(nameof(Taxi));
        public static string Fitness => Text(nameof(Fitness));
        public static string Party => Text(nameof(Party));
        #endregion

        static readonly Dictionary<string, LanguageResource> dict = new();

        public static string Text(string name, params object[] args)
        {
            string current = App.CurrentCulture.PlatformString;
            if (!dict.TryGetValue(current, out LanguageResource lang))
            {
                lang = new LanguageResource(App.CurrentCulture);
                dict.Add(current, lang);
            }
            if (args == null || args.Length == 0)
            {
                return lang[name];
            }
            return string.Format(lang[name], args);
        }

        private class LanguageResource
        {
            private readonly Dictionary<string, string> strings;

            public string this[string key]
            {
                get
                {
                    if (strings != null && strings.TryGetValue(key, out string val))
                    {
                        return val;
                    }
                    return key;
                }
            }

            public LanguageResource(PlatformCulture lang)
            {
                try
                {
                    var ns = lang.GetNamespace();
                    var langId = $"{ns}.Languages.{lang.Language}.xml";
                    var langCodeId = $"{ns}.Languages.{lang.LanguageCode}.xml";
                    var assembly = typeof(LanguageResource).Assembly;
                    var name = assembly.GetManifestResourceNames().FirstOrDefault(n =>
                        string.Equals(n, langId, StringComparison.OrdinalIgnoreCase) ||
                        string.Equals(n, langCodeId, StringComparison.OrdinalIgnoreCase));
                    if (name == null)
                    {
                        name = $"{ns}.Languages.zh-CN.xml";
                    }
                    var xml = new XmlDocument();
                    using (var stream = assembly.GetManifestResourceStream(name))
                    {
                        xml.Load(stream);
                    }
                    strings = new Dictionary<string, string>();
                    foreach (XmlElement ele in xml.DocumentElement)
                    {
                        strings[ele.Name] = ele.InnerText;
                    }
                }
                catch (Exception ex)
                {
                    Helper.Error("language.ctor", $"failed to load json resource: {lang}, {ex.Message}");
                }
            }
        }
    }

    [ContentProperty(nameof(Text))]
    public class TextExtension : IMarkupExtension
    {
        public string Text { get; set; }

        public object ProvideValue(IServiceProvider serviceProvider)
        {
            if (Text == null)
            {
                return string.Empty;
            }
            return Resource.Text(Text);
        }
    }
}