using Mesen.Config;
using Mesen.Debugger.Labels;
using Mesen.Interop;
using Mesen.Utilities;
using Mesen.Windows;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;

namespace Mesen.Debugger.Integration;

public class RgbdsSymbolFile
{
	private static bool IsValidRow(string row)
	{
		return GetBankAddressLabel(row, out _, out _, out _);
	}

	public static bool IsValidFile(string path, bool silent = false)
	{
		string[] content = File.ReadAllLines(path, Encoding.UTF8);
		int errorCount = 0;
		for(int i = 0; i < 20 && i < content.Length; i++) {
			if(!IsValidRow(content[i])) {
				errorCount++;
			}
		}
		return errorCount < 5;
	}

	private static bool GetBankAddressLabel(string row, out UInt32 address, out UInt32 bank, out string? labelName)
	{
		address = 0;
		bank = 0;
		labelName = null;

		string lineData = row;
		int commentIndex = lineData.IndexOf(';');
		if(commentIndex >= 0) {
			lineData = lineData.Substring(0, commentIndex);
		}
		lineData = lineData.Trim();
		if(lineData.Length == 0) {
			return true;
		}

		int splitIndex = lineData.IndexOf(' ');
		if(splitIndex < 0) {
			return false;
		}

		string[] bankAddressStr = lineData.Substring(0, splitIndex).Split(':');
		if(bankAddressStr.Length != 2) {
			return false;
		}

		if(!UInt32.TryParse(bankAddressStr[0], NumberStyles.HexNumber, null, out bank)) {
			return false;
		}

		if(!UInt32.TryParse(bankAddressStr[1], NumberStyles.HexNumber, null, out address)) {
			return false;
		}

		labelName = LabelManager.InvalidLabelRegex.Replace(lineData.Substring(splitIndex + 1), "_");
		if(string.IsNullOrEmpty(labelName) || !LabelManager.LabelRegex.IsMatch(labelName)) {
			return false;
		}
		return true;
	}

	public static void Import(string path, bool showResult)
	{
		const int prgBankSize = 0x4000;
		const int wramBankSize = 0x1000;
		const int sramBankSize = 0x2000;

		List<CodeLabel> labels = new List<CodeLabel>(1000);

		Dictionary<MemoryType, int> sizeByMemoryType = new();

		int errorCount = 0;
		foreach(string row in File.ReadAllLines(path, Encoding.UTF8)) {
			UInt32 address;
			UInt32 bank;
			string? labelName;

			if(!GetBankAddressLabel(row, out address, out bank, out labelName)) {
				errorCount++;
				continue;
			} else if(labelName == null) {
				//Empty line/comment
				continue;
			} else if(address > 0xFFFF) {
				errorCount++;
				continue;
			}

			UInt32 fullAddress = 0;
			AddressInfo absAddress;
			if(address <= 0x7FFF) {
				fullAddress = bank * prgBankSize + (address & (prgBankSize - 1));
				absAddress = new AddressInfo() { Address = (int)fullAddress, Type = MemoryType.GbPrgRom };
			} else if(address >= 0xA000 && address <= 0xBFFF) {
				fullAddress = bank * sramBankSize + (address & (sramBankSize - 1));
				absAddress = new AddressInfo() { Address = (int)fullAddress, Type = MemoryType.GbCartRam };
			} else if(address >= 0xC000 && address <= 0xDFFF) {
				fullAddress = bank * wramBankSize + (address & (wramBankSize - 1));
				absAddress = new AddressInfo() { Address = (int)fullAddress, Type = MemoryType.GbWorkRam };
			} else {
				absAddress = DebugApi.GetAbsoluteAddress(new AddressInfo() { Address = (int)address, Type = MemoryType.GameboyMemory });
			}

			if(absAddress.Address >= 0) {
				if(!sizeByMemoryType.TryGetValue(absAddress.Type, out int size)) {
					sizeByMemoryType[absAddress.Type] = size = DebugApi.GetMemorySize(absAddress.Type);
				}

				if(absAddress.Address >= size) {
					errorCount++;
					continue;
				}

				CodeLabel label = new CodeLabel();
				label.Address = (UInt32)absAddress.Address;
				label.MemoryType = absAddress.Type;
				label.Comment = "";
				label.Label = labelName;
				if(ConfigManager.Config.Debug.Integration.IsMemoryTypeImportEnabled(label.MemoryType)) {
					labels.Add(label);
				}
			} else {
				errorCount++;
			}
		}

		LabelManager.SetLabels(labels);

		if(showResult) {
			if(errorCount > 0) {
				MesenMsgBox.Show(null, "ImportLabelsWithErrors", MessageBoxButtons.OK, MessageBoxIcon.Warning, labels.Count.ToString(), errorCount.ToString());
			} else {
				MesenMsgBox.Show(null, "ImportLabels", MessageBoxButtons.OK, MessageBoxIcon.Info, labels.Count.ToString());
			}
		}
	}
}