package emu.grasscutter.data;

import java.io.*;
import java.util.*;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.google.gson.Gson;
import emu.grasscutter.utils.Utils;
import org.reflections.Reflections;

import com.google.gson.JsonElement;
import com.google.gson.annotations.SerializedName;
import com.google.gson.reflect.TypeToken;

import emu.grasscutter.Grasscutter;
import emu.grasscutter.data.binout.AbilityEmbryoEntry;
import emu.grasscutter.data.binout.AbilityModifier;
import emu.grasscutter.data.binout.AbilityModifierEntry;
import emu.grasscutter.data.binout.MainQuestData;
import emu.grasscutter.data.binout.OpenConfigEntry;
import emu.grasscutter.data.binout.ScenePointEntry;
import emu.grasscutter.data.binout.AbilityModifier.AbilityConfigData;
import emu.grasscutter.data.binout.AbilityModifier.AbilityModifierAction;
import emu.grasscutter.data.binout.AbilityModifier.AbilityModifierActionType;
import emu.grasscutter.data.common.PointData;
import emu.grasscutter.data.common.ScenePointConfig;
import emu.grasscutter.game.world.SpawnDataEntry.*;
import it.unimi.dsi.fastutil.ints.Int2ObjectMap;

import static emu.grasscutter.Configuration.*;

public class ResourceLoader {

	private static List<String> loadedResources = new ArrayList<String>();

	public static List<Class<?>> getResourceDefClasses() {
		Reflections reflections = new Reflections(ResourceLoader.class.getPackage().getName());
		Set<?> classes = reflections.getSubTypesOf(GameResource.class);

		List<Class<?>> classList = new ArrayList<>(classes.size());
		classes.forEach(o -> {
			Class<?> c = (Class<?>) o;
			if (c.getAnnotation(ResourceType.class) != null) {
				classList.add(c);
			}
		});

		classList.sort((a, b) -> b.getAnnotation(ResourceType.class).loadPriority().value() - a.getAnnotation(ResourceType.class).loadPriority().value());

		return classList;
	}
	
	public static void loadAll() {
		// Load ability lists
		loadAbilityEmbryos();
		loadOpenConfig();
		loadAbilityModifiers();
		// Load resources
		loadResources();
		// Process into depots
		GameDepot.load();
		// Load spawn data and quests
		loadSpawnData();
		loadQuests();
		// Load scene points - must be done AFTER resources are loaded
		loadScenePoints();
	}

	public static void loadResources() {
		loadResources(false);
	}

	public static void loadResources(boolean doReload) {
		for (Class<?> resourceDefinition : getResourceDefClasses()) {
			ResourceType type = resourceDefinition.getAnnotation(ResourceType.class);

			if (type == null) {
				continue;
			}

			@SuppressWarnings("rawtypes")
			Int2ObjectMap map = GameData.getMapByResourceDef(resourceDefinition);

			if (map == null) {
				continue;
			}

			try {
				loadFromResource(resourceDefinition, type, map, doReload);
			} catch (Exception e) {
				Grasscutter.getLogger().error("Error loading resource file: " + Arrays.toString(type.name()), e);
			}
		}
	}
	
	@SuppressWarnings("rawtypes")
	protected static void loadFromResource(Class<?> c, ResourceType type, Int2ObjectMap map, boolean doReload) throws Exception {
		if(!loadedResources.contains(c.getSimpleName()) || doReload) {
			for (String name : type.name()) {
				loadFromResource(c, name, map);
			}
			Grasscutter.getLogger().info("Loaded " + map.size() + " " + c.getSimpleName() + "s.");
			loadedResources.add(c.getSimpleName());
		}
	}

	@SuppressWarnings({"rawtypes", "unchecked"})
	protected static void loadFromResource(Class<?> c, String fileName, Int2ObjectMap map) throws Exception {
		try (FileReader fileReader = new FileReader(RESOURCE("ExcelBinOutput/" + fileName))) {
			List list = Grasscutter.getGsonFactory().fromJson(fileReader, TypeToken.getParameterized(Collection.class, c).getType());

			for (Object o : list) {
				GameResource res = (GameResource) o;
				res.onLoad();
				map.put(res.getId(), res);
			}
		}
	}

	private static void loadScenePoints() {
		Pattern pattern = Pattern.compile("(?<=scene)(.*?)(?=_point.json)");
		File folder = new File(RESOURCE("BinOutput/Scene/Point"));

		if (!folder.isDirectory() || !folder.exists() || folder.listFiles() == null) {
			Grasscutter.getLogger().error("Scene point files cannot be found, you cannot use teleport waypoints!");
			return;
		}

		List<ScenePointEntry> scenePointList = new ArrayList<>();
		for (File file : Objects.requireNonNull(folder.listFiles())) {
			ScenePointConfig config; Integer sceneId;
			
			Matcher matcher = pattern.matcher(file.getName());
			if (matcher.find()) {
				sceneId = Integer.parseInt(matcher.group(1));
			} else {
				continue;
			}

			try (FileReader fileReader = new FileReader(file)) {
				config = Grasscutter.getGsonFactory().fromJson(fileReader, ScenePointConfig.class);
			} catch (Exception e) {
				e.printStackTrace();
				continue;
			}

			if (config.points == null) {
				continue;
			}

			for (Map.Entry<String, JsonElement> entry : config.points.entrySet()) {
				PointData pointData = Grasscutter.getGsonFactory().fromJson(entry.getValue(), PointData.class);
				pointData.setId(Integer.parseInt(entry.getKey()));

				ScenePointEntry sl = new ScenePointEntry(sceneId + "_" + entry.getKey(), pointData);
				scenePointList.add(sl);
				GameData.getScenePointIdList().add(pointData.getId());
				
				pointData.updateDailyDungeon();
			}

			for (ScenePointEntry entry : scenePointList) {
				GameData.getScenePointEntries().put(entry.getName(), entry);
			}
		}
	}

	private static void loadAbilityEmbryos() {
		List<AbilityEmbryoEntry> embryoList = null;

		// Read from cached file if exists
		try(InputStream embryoCache = DataLoader.load("AbilityEmbryos.json", false)) {
			embryoList = Grasscutter.getGsonFactory().fromJson(new InputStreamReader(embryoCache), TypeToken.getParameterized(Collection.class, AbilityEmbryoEntry.class).getType());
		} catch(Exception ignored) {}

		if(embryoList == null) {
			// Load from BinOutput
			Pattern pattern = Pattern.compile("(?<=ConfigAvatar_)(.*?)(?=.json)");

			embryoList = new LinkedList<>();
			File folder = new File(Utils.toFilePath(RESOURCE("BinOutput/Avatar/")));
			File[] files = folder.listFiles();
			if(files == null) {
				Grasscutter.getLogger().error("Error loading ability embryos: no files found in " + folder.getAbsolutePath());
				return;
			}

			for (File file : files) {
				AvatarConfig config;
				String avatarName;

				Matcher matcher = pattern.matcher(file.getName());
				if (matcher.find()) {
					avatarName = matcher.group(0);
				} else {
					continue;
				}

				try (FileReader fileReader = new FileReader(file)) {
					config = Grasscutter.getGsonFactory().fromJson(fileReader, AvatarConfig.class);
				} catch (Exception e) {
					e.printStackTrace();
					continue;
				}

				if (config.abilities == null) {
					continue;
				}

				int s = config.abilities.size();
				AbilityEmbryoEntry al = new AbilityEmbryoEntry(avatarName, config.abilities.stream().map(Object::toString).toArray(size -> new String[s]));
				embryoList.add(al);
			}
			
			File playerElementsFile = new File(Utils.toFilePath(RESOURCE("BinOutput/AbilityGroup/AbilityGroup_Other_PlayerElementAbility.json")));
			
			if (playerElementsFile.exists()) {
				try (FileReader fileReader = new FileReader(playerElementsFile)) {
					GameDepot.setPlayerAbilities(Grasscutter.getGsonFactory().fromJson(fileReader, new TypeToken<Map<String, AvatarConfig>>(){}.getType()));
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
		
		if (embryoList == null || embryoList.isEmpty()) {
			Grasscutter.getLogger().error("No embryos loaded!");
			return;
		}

		for (AbilityEmbryoEntry entry : embryoList) {
			GameData.getAbilityEmbryoInfo().put(entry.getName(), entry);
		}
	}
	
	private static void loadAbilityModifiers() {
		// Load from BinOutput
		File folder = new File(Utils.toFilePath(RESOURCE("BinOutput/Ability/Temp/AvatarAbilities/")));
		File[] files = folder.listFiles();
		if (files == null) {
			Grasscutter.getLogger().error("Error loading ability modifiers: no files found in " + folder.getAbsolutePath());
			return;
		}

		for (File file : files) {
			List<AbilityConfigData> abilityConfigList;
			
			try (FileReader fileReader = new FileReader(file)) {
				abilityConfigList = Grasscutter.getGsonFactory().fromJson(fileReader, TypeToken.getParameterized(Collection.class, AbilityConfigData.class).getType());
			} catch (Exception e) {
				e.printStackTrace();
				continue;
			}
			
			for (AbilityConfigData data : abilityConfigList) {
				if (data.Default.modifiers == null || data.Default.modifiers.size() == 0) {
					continue;
				}
				
				AbilityModifierEntry modifierEntry = new AbilityModifierEntry(data.Default.abilityName);
				
				for (Entry<String, AbilityModifier> entry : data.Default.modifiers.entrySet()) {
					AbilityModifier modifier = entry.getValue();
					
					// Stare.
					if (modifier.onAdded != null) {
						for (AbilityModifierAction action : modifier.onAdded) {
							if (action.$type.contains("HealHP")) {
								action.type = AbilityModifierActionType.HealHP;
								modifierEntry.getOnAdded().add(action);
							}
						}
					}
					
					if (modifier.onThinkInterval != null) {
						for (AbilityModifierAction action : modifier.onThinkInterval) {
							if (action.$type.contains("HealHP")) {
								action.type = AbilityModifierActionType.HealHP;
								modifierEntry.getOnThinkInterval().add(action);
							}
						}
					}
					
					if (modifier.onRemoved != null) {
						for (AbilityModifierAction action : modifier.onRemoved) {
							if (action.$type.contains("HealHP")) {
								action.type = AbilityModifierActionType.HealHP;
								modifierEntry.getOnRemoved().add(action);
							}
						}
					}
				}
				
				GameData.getAbilityModifiers().put(modifierEntry.getName(), modifierEntry);
			}
		}
	}
	
	private static void loadSpawnData() {
		List<SpawnGroupEntry> spawnEntryList = null;

		// Read from cached file if exists
		try(InputStream spawnDataEntries = DataLoader.load("Spawns.json")) {
			spawnEntryList = Grasscutter.getGsonFactory().fromJson(new InputStreamReader(spawnDataEntries), TypeToken.getParameterized(Collection.class, SpawnGroupEntry.class).getType());
		} catch (Exception ignored) {}
		
		if (spawnEntryList == null || spawnEntryList.isEmpty()) {
			Grasscutter.getLogger().error("No spawn data loaded!");
			return;
		}

		for (SpawnGroupEntry entry : spawnEntryList) {
			entry.getSpawns().forEach(s -> s.setGroup(entry));
			GameDepot.getSpawnListById(entry.getSceneId()).insert(entry, entry.getPos().getX(), entry.getPos().getZ());
		}
	}
	
	private static void loadOpenConfig() {
		// Read from cached file if exists
		List<OpenConfigEntry> list = null;

		try(InputStream openConfigCache = DataLoader.load("OpenConfig.json", false)) {
			list = Grasscutter.getGsonFactory().fromJson(new InputStreamReader(openConfigCache), TypeToken.getParameterized(Collection.class, SpawnGroupEntry.class).getType());
		} catch (Exception ignored) {}

		if (list == null) {
			Map<String, OpenConfigEntry> map = new TreeMap<>();
			java.lang.reflect.Type type = new TypeToken<Map<String, OpenConfigData[]>>() {}.getType();
			String[] folderNames = {"BinOutput/Talent/EquipTalents/", "BinOutput/Talent/AvatarTalents/"};
			
			for (String name : folderNames) {
				File folder = new File(Utils.toFilePath(RESOURCE(name)));
				File[] files = folder.listFiles();
				if(files == null) {
					Grasscutter.getLogger().error("Error loading open config: no files found in " + folder.getAbsolutePath()); return;
				}
				
				for (File file : files) {
					if (!file.getName().endsWith(".json")) {
						continue;
					}
					
					Map<String, OpenConfigData[]> config;
					
					try (FileReader fileReader = new FileReader(file)) {
						config = Grasscutter.getGsonFactory().fromJson(fileReader, type);
					} catch (Exception e) {
						e.printStackTrace();
						continue;
					}
					
					for (Entry<String, OpenConfigData[]> e : config.entrySet()) {
						OpenConfigEntry entry = new OpenConfigEntry(e.getKey(), e.getValue());
						map.put(entry.getName(), entry);
					}
				}
			}
			
			list = new ArrayList<>(map.values());
		}
		
		if (list == null || list.isEmpty()) {
			Grasscutter.getLogger().error("No openconfig entries loaded!");
			return;
		}
		
		for (OpenConfigEntry entry : list) {
			GameData.getOpenConfigEntries().put(entry.getName(), entry);
		}
	}
	
	private static void loadQuests() {
		File folder = new File(RESOURCE("BinOutput/Quest/"));
		
		if (!folder.exists()) {
			return;
		}
		
		for (File file : folder.listFiles()) {
			MainQuestData mainQuest = null;
			
			try (FileReader fileReader = new FileReader(file)) {
				mainQuest = Grasscutter.getGsonFactory().fromJson(fileReader, MainQuestData.class);
			} catch (Exception e) {
				e.printStackTrace();
				continue;
			}
			
			GameData.getMainQuestDataMap().put(mainQuest.getId(), mainQuest);
		}
		
		Grasscutter.getLogger().info("Loaded " + GameData.getMainQuestDataMap().size() + " MainQuestDatas.");
	}

	// BinOutput configs
	
	public static class AvatarConfig {
		@SerializedName(value="abilities", alternate={"targetAbilities"})
		public ArrayList<AvatarConfigAbility> abilities;
	}
	
	public static class AvatarConfigAbility {
		public String abilityName;
		public String toString() {
			return abilityName;
		}
	}
	
	private static class OpenConfig {
		public OpenConfigData[] data;
	}
	
	public static class OpenConfigData {
		public String $type;
		public String abilityName;
		
		@SerializedName(value="talentIndex", alternate={"OJOFFKLNAHN"})
		public int talentIndex;
		
		@SerializedName(value="skillID", alternate={"overtime"})
		public int skillID;
		
		@SerializedName(value="pointDelta", alternate={"IGEBKIHPOIF"})
		public int pointDelta;
	}
}