using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using ParadoxSaveParser.Lib;

namespace ParadoxSaveParser.Benchmarks;

/// <summary>
///     Checks whether the regex approach associates the right country tag with the right
///     technology block. It cannot: 933 of the 2803 country blocks in the test save have no
///     technology block at all, so a lazy "tag ... technology" pattern silently pairs a tag
///     with a technology block belonging to a later country.
/// </summary>
public static class Mispairing
{
    public static Dictionary<string, long> FromParser(byte[] pdx)
    {
        var result = new Dictionary<string, long>();
        using var stream = new MemoryStream(pdx, false);
        var root = new SaveParserEU4(stream, new SearchExpressionCompilation(BenchData.PdxQuery)).Parse();
        foreach (var (tag, value) in (Dictionary<string, object>)root["countries"])
        {
            if (value is Dictionary<string, object> c
                && c.TryGetValue("technology", out var t)
                && t is Dictionary<string, object> tech
                && tech.TryGetValue("adm_tech", out var adm))
                result[tag] = (long)adm;
        }

        return result;
    }

    public static Dictionary<string, long> FromRegex(string text, Regex pathAware)
    {
        var result = new Dictionary<string, long>();
        foreach (Match m in pathAware.Matches(text))
            result[m.Groups[1].Value] = long.Parse(m.Groups[2].ValueSpan);
        return result;
    }

    public static void Report(byte[] pdx, string text)
    {
        var expected = FromParser(pdx);
        var actual = FromRegex(text, new Regex(Extractors.PathAwarePattern, RegexOptions.Compiled));
        int missing = 0, wrong = 0, extra = 0;
        foreach (var (tag, adm) in expected)
        {
            if (!actual.TryGetValue(tag, out long got)) { missing++; Console.WriteLine($"  missing tag: {tag}"); }
            else if (got != adm) wrong++;
        }

        foreach (var tag in actual.Keys)
            if (!expected.ContainsKey(tag))
                extra++;

        Console.WriteLine($"path aware regex pairing: {expected.Count} countries have technology, " +
                          $"regex reported {actual.Count}; missing={missing} wrong_value={wrong} invented={extra}");
    }
}