using System.Linq;
using System.Text.RegularExpressions;
using Content.Shared.Random.Helpers;
using Content.Shared.Speech.Components;
using Robust.Shared.Random;
using Robust.Shared.Timing;

namespace Content.Shared.Speech.EntitySystems;

public sealed partial class ParrotAccentSystem : RelayAccentSystem<ParrotAccentComponent>
{
    private static readonly Regex WordCleanupRegex = new("[^A-Za-z0-9 -]");

    [Dependency] private IGameTiming _timing = default!;

    public override string Accentuate(string message, Entity<ParrotAccentComponent>? ent = null)
    {
        if (ent == null)
            return message;

        var random = SharedRandomExtensions.PredictedRandom(_timing, GetNetEntity(ent.Value));

        // Sometimes repeat the longest word at the end of the message, after a squawk! SQUAWK! Sometimes!
        if (random.Prob(ent.Value.Comp.LongestWordRepeatChance))
        {
            // Don't count non-alphanumeric characters as parts of words
            var cleaned = WordCleanupRegex.Replace(message, string.Empty);
            // Split on whitespace and favor words towards the end of the message
            var words = cleaned.Split(null).Reverse();
            // Find longest word
            var longest = words.MaxBy(word => word.Length);

            if (longest?.Length >= ent.Value.Comp.LongestWordMinLength)
            {
                message = EnsurePunctuation(message);

                // Capitalize the first letter of the repeated word
                longest = string.Concat(longest[0].ToString().ToUpper(), longest.AsSpan(1));

                message = $"{message} {GetRandomSquawk(ent.Value)} {longest}!";
                return message; // No more changes, or it's too much
            }
        }

        if (random.Prob(ent.Value.Comp.SquawkPrefixChance))
        {
            // AWWK! Sometimes add a squawk at the beginning of the message
            message = $"{GetRandomSquawk(ent.Value)} {message}";
        }
        else
        {
            // Otherwise add a squawk at the end of the message! RAWWK!
            message = EnsurePunctuation(message);
            message = $"{message} {GetRandomSquawk(ent.Value)}";
        }

        return message;
    }

    /// <summary>
    /// Adds a "!" to the end of the string, if there isn't already a sentence-ending punctuation mark.
    /// </summary>
    private string EnsurePunctuation(string message)
    {
        return message.EndsWith('!') || message.EndsWith('?') || message.EndsWith('.')
            ? message
            : message + '!';
    }

    /// <summary>
    /// Returns a random, localized squawk sound.
    /// </summary>
    private string GetRandomSquawk(Entity<ParrotAccentComponent> ent)
    {
        var random = SharedRandomExtensions.PredictedRandom(_timing, GetNetEntity(ent));
        return Loc.GetString(random.Pick(ent.Comp.Squawks));
    }
}