package me.libraryaddict.disguise.utilities;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;

import me.libraryaddict.disguise.disguisetypes.AnimalColor;
import me.libraryaddict.disguise.disguisetypes.Disguise;
import me.libraryaddict.disguise.disguisetypes.DisguiseType;
import me.libraryaddict.disguise.disguisetypes.MiscDisguise;
import me.libraryaddict.disguise.disguisetypes.MobDisguise;
import me.libraryaddict.disguise.disguisetypes.PlayerDisguise;

import org.bukkit.ChatColor;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Ageable;
import org.bukkit.entity.Animals;
import org.bukkit.entity.Monster;
import org.bukkit.inventory.ItemStack;
import org.bukkit.permissions.PermissionAttachmentInfo;
import org.bukkit.potion.PotionEffectType;

public abstract class BaseDisguiseCommand implements CommandExecutor {

    protected ArrayList<String> getAllowedDisguises(CommandSender sender) {
        String permissionNode = "libsdisguises." + getClass().getSimpleName().replace("Command", "").toLowerCase() + ".";
        return getAllowedDisguises(sender, permissionNode);
    }

    protected ArrayList<String> getAllowedDisguises(CommandSender sender, String permissionNode) {
        HashSet<String> singleAllowed = new HashSet<String>();
        HashSet<String> singleForbidden = new HashSet<String>();
        HashSet<String> globalForbidden = new HashSet<String>();
        HashSet<String> globalAllowed = new HashSet<String>();
        for (PermissionAttachmentInfo permission : sender.getEffectivePermissions()) {
            String perm = permission.getPermission().toLowerCase();
            if (perm.startsWith(permissionNode)) {
                perm = perm.substring(permissionNode.length());
                String disguiseType = perm.split("\\.")[0];
                HashSet<String> perms;
                for (DisguiseType type : DisguiseType.values()) {
                    if (type.getEntityType() == null) {
                        continue;
                    }
                    Class entityClass = type.getEntityType().getEntityClass();
                    String name = type.name().toLowerCase();
                    if (!perm.equalsIgnoreCase(name)) {
                        perms = (permission.getValue() ? globalAllowed : globalForbidden);
                    } else {
                        perms = (permission.getValue() ? singleAllowed : singleForbidden);
                    }
                    if (perm.equals("mob")) {
                        if (type.isMob()) {
                            perms.add(name);
                        }
                    } else if (perm.equals("animal") || perm.equals("animals")) {
                        if (Animals.class.isAssignableFrom(entityClass)) {
                            perms.add(name);
                        }
                    } else if (perm.equals("monster") || perm.equals("monsters")) {
                        if (Monster.class.isAssignableFrom(entityClass)) {
                            perms.add(name);
                        }
                    } else if (perm.equals("misc")) {
                        if (type.isMisc()) {
                            perms.add(name);
                        }
                    } else if (perm.equals("ageable")) {
                        if (Ageable.class.isAssignableFrom(entityClass)) {
                            perms.add(name);
                        }
                    } else if (disguiseType.equals("*")) {
                        perms.add(name);
                    } else if (disguiseType.equals(name)) {
                        perms.add(name);
                    }
                }
            }
        }
        // This does the disguises for OP's.
        for (DisguiseType type : DisguiseType.values()) {
            if (type.getEntityType() == null) {
                continue;
            }
            if (!globalAllowed.contains(type.name().toLowerCase())) {
                if (sender.hasPermission(permissionNode + "*")
                        || sender.hasPermission(permissionNode + type.name().toLowerCase())) {
                    globalAllowed.add(type.name().toLowerCase());
                }
            }
        }
        globalAllowed.removeAll(globalForbidden);
        singleAllowed.addAll(globalAllowed);
        singleAllowed.removeAll(singleForbidden);
        ArrayList<String> disguiseTypes = new ArrayList<String>(singleAllowed);
        Collections.sort(disguiseTypes, String.CASE_INSENSITIVE_ORDER);
        return disguiseTypes;
    }

    protected boolean isDouble(String string) {
        try {
            Float.parseFloat(string);
            return true;
        } catch (Exception ex) {
            return false;
        }
    }

    protected boolean isNumeric(String string) {
        try {
            Integer.parseInt(string);
            return true;
        } catch (Exception ex) {
            return false;
        }
    }

    /**
     * Returns null if they have all perms. Else they can only use the options in the returned
     */
    protected HashSet<HashSet<String>> getPermissions(CommandSender sender, String disguiseType) {
        HashSet<HashSet<String>> perms = new HashSet<HashSet<String>>();
        String permNode = "libsdisguises." + getClass().getSimpleName().replace("Command", "").toLowerCase() + ".";
        for (PermissionAttachmentInfo permission : sender.getEffectivePermissions()) {
            if (permission.getValue()) {
                String s = permission.getPermission().toLowerCase();
                if (s.startsWith(permNode + disguiseType) || s.startsWith(permNode + "*")) {
                    if (s.startsWith(permNode + disguiseType))
                        s = s.substring((permNode + disguiseType).length());
                    else if (s.startsWith(permNode + "*")) {
                        s = s.substring((permNode + "*").length());
                        if (s.length() == 0)
                            continue;
                    }
                    if (s.length() == 0)
                        return new HashSet<HashSet<String>>();
                    HashSet<String> p = new HashSet<String>();
                    for (String str : s.split("\\.")) {
                        if (str.equals("baby"))
                            str = "setbaby";
                        if (str.equals("-baby"))
                            str = "-setbaby";
                        p.add(str);
                    }
                    perms.add(p);
                }
            }
        }
        return perms;
    }

    /**
     * Returns the disguise if it all parsed correctly. Returns a exception with a complete message if it didn't. The
     * commandsender is purely used for checking permissions. Would defeat the purpose otherwise. To reach this point, the
     * disguise has been feed a proper disguisetype.
     */
    protected Disguise parseDisguise(CommandSender sender, String[] args) throws Exception {
        ArrayList<String> allowedDisguises = getAllowedDisguises(sender);
        if (allowedDisguises.isEmpty()) {
            throw new Exception(ChatColor.RED + "You are forbidden to use this command.");
        }
        if (args.length == 0) {
            sendCommandUsage(sender);
            throw new Exception();
        }
        // How many args to skip due to the disugise being constructed
        // Time to start constructing the disguise.
        // We will need to check between all 3 kinds of disguises
        int toSkip = 1;
        ArrayList<String> usedOptions = new ArrayList<String>();
        Disguise disguise = null;
        HashSet<HashSet<String>> optionPermissions;
        if (args[0].startsWith("@")) {
            if (sender.hasPermission("libsdisguises.disguise.disguiseclone")) {
                disguise = DisguiseUtilities.getClonedDisguise(args[0].toLowerCase());
                if (disguise == null) {
                    throw new Exception(ChatColor.RED + "Cannot find a disguise under the reference " + args[0]);
                }
            } else {
                throw new Exception(ChatColor.RED + "You do not have perimssion to use disguise references!");
            }
            optionPermissions = this.getPermissions(sender, disguise.getType().name().toLowerCase());
        } else {
            DisguiseType disguiseType = null;
            if (args[0].equalsIgnoreCase("p")) {
                disguiseType = DisguiseType.PLAYER;
            } else {
                for (DisguiseType type : DisguiseType.values()) {
                    if (type.getEntityType() == null) {
                        continue;
                    }
                    if (args[0].equalsIgnoreCase(type.name()) || args[0].equalsIgnoreCase(type.name().replace("_", ""))) {
                        disguiseType = type;
                        break;
                    }
                }
            }
            if (disguiseType == null) {
                throw new Exception(ChatColor.RED + "Error! The disguise " + ChatColor.GREEN + args[0] + ChatColor.RED
                        + " doesn't exist!");
            }
            if (!allowedDisguises.contains(disguiseType.name().toLowerCase())) {
                throw new Exception(ChatColor.RED + "You are forbidden to use this disguise.");
            }
            optionPermissions = this.getPermissions(sender, disguiseType.name().toLowerCase());
            if (disguiseType.isPlayer()) {// If he is doing a player disguise
                if (args.length == 1) {
                    // He needs to give the player name
                    throw new Exception(ChatColor.RED + "Error! You need to give a player name!");
                } else {
                    // Construct the player disguise
                    disguise = new PlayerDisguise(ChatColor.translateAlternateColorCodes('&', args[1]));
                    toSkip++;
                }
            } else {
                if (disguiseType.isMob()) { // Its a mob, use the mob constructor
                    boolean adult = true;
                    if (args.length > 1) {
                        if (args[1].equalsIgnoreCase("baby") || args[1].equalsIgnoreCase("adult")) {
                            usedOptions.add("setbaby");
                            doCheck(optionPermissions, usedOptions);
                            adult = args[1].equalsIgnoreCase("adult");
                            toSkip++;
                        }
                    }
                    disguise = new MobDisguise(disguiseType, adult);
                } else if (disguiseType.isMisc()) {
                    // Its a misc, we are going to use the MiscDisguise constructor.
                    int miscId = -1;
                    int miscData = -1;
                    if (args.length > 1) {
                        // They have defined more arguements!
                        // If the first arg is a number
                        if (isNumeric(args[1])) {
                            miscId = Integer.parseInt(args[1]);
                            toSkip++;
                            // If they also defined a data value
                            if (args.length > 2) {
                                if (isNumeric(args[2])) {
                                    miscData = Integer.parseInt(args[2]);
                                    toSkip++;
                                }
                            }
                        }
                    }
                    if (miscId != -1) {
                        if (disguiseType == DisguiseType.FALLING_BLOCK) {
                            usedOptions.add("setblock");
                            doCheck(optionPermissions, usedOptions);
                        } else if (disguiseType == DisguiseType.PAINTING) {
                            usedOptions.add("setpainting");
                            doCheck(optionPermissions, usedOptions);
                        } else if (disguiseType == DisguiseType.SPLASH_POTION) {
                            usedOptions.add("setpotionid");
                            doCheck(optionPermissions, usedOptions);
                        }
                    }
                    // Construct the disguise
                    disguise = new MiscDisguise(disguiseType, miscId, miscData);
                }
            }
        }
        // Copy strings to their new range
        String[] newArgs = new String[args.length - toSkip];
        for (int i = toSkip; i < args.length; i++) {
            newArgs[i - toSkip] = args[i];
        }
        args = newArgs;
        for (int i = 0; i < args.length; i += 2) {
            String methodName = args[i];
            if (i + 1 >= args.length) {
                throw new Exception(ChatColor.RED + "No value was given for the option " + methodName);
            }
            String valueString = args[i + 1];
            Method methodToUse = null;
            Object value = null;
            for (Method method : disguise.getWatcher().getClass().getMethods()) {
                if (!method.getName().startsWith("get") && method.getName().equalsIgnoreCase(methodName)
                        && method.getAnnotation(Deprecated.class) == null && method.getParameterTypes().length == 1) {
                    methodToUse = method;
                    methodName = method.getName();
                    Class<?>[] types = method.getParameterTypes();
                    if (types.length == 1) {
                        Class param = types[0];
                        // Parse to number
                        if (int.class == param) {
                            if (isNumeric(valueString)) {
                                value = (int) Integer.parseInt(valueString);
                            } else {
                                throw parseToException("number", valueString, methodName);
                            }
                            // Parse to boolean
                        } else if (float.class == param || double.class == param) {
                            if (isDouble(valueString)) {
                                float obj = Float.parseFloat(valueString);
                                if (param == float.class) {
                                    value = (float) obj;
                                } else if (param == int.class) {
                                    value = (int) obj;
                                } else if (param == double.class) {
                                    value = (double) obj;
                                }
                            } else {
                                throw parseToException("number.0", valueString, methodName);
                            }
                            // Parse to boolean
                        } else if (boolean.class == param) {
                            if (!("true".equalsIgnoreCase(valueString) || "false".equalsIgnoreCase(valueString)))
                                throw parseToException("true/false", valueString, methodName);
                            value = (boolean) "true".equalsIgnoreCase(valueString);
                            // Parse to string
                        } else if (param == String.class) {
                            value = ChatColor.translateAlternateColorCodes('&', valueString);
                            // Parse to animal color
                        } else if (param == AnimalColor.class) {
                            try {
                                value = AnimalColor.valueOf(valueString.toUpperCase());
                            } catch (Exception ex) {
                                throw parseToException("animal color", valueString, methodName);
                            }
                            // Parse to itemstack
                        } else if (param == ItemStack.class) {
                            try {
                                value = parseToItemstack(valueString);
                            } catch (Exception ex) {
                                throw new Exception(String.format(ex.getMessage(), methodName));
                            }
                            // Parse to itemstack array
                        } else if (param == ItemStack[].class) {
                            ItemStack[] items = new ItemStack[4];
                            String[] split = valueString.split(",");
                            if (split.length == 4) {
                                for (int a = 0; a < 4; a++) {
                                    try {
                                        ItemStack item = parseToItemstack(split[a]);
                                        items[a] = item;
                                    } catch (Exception ex) {
                                        throw parseToException("item ID,ID,ID,ID" + ChatColor.RED + " or " + ChatColor.GREEN
                                                + "ID:Data,ID:Data,ID:Data,ID:Data combo", valueString, methodName);
                                    }
                                }
                            } else {
                                throw parseToException("item ID,ID,ID,ID" + ChatColor.RED + " or " + ChatColor.GREEN
                                        + "ID:Data,ID:Data,ID:Data,ID:Data combo", valueString, methodName);
                            }
                            value = items;
                            // Parse to horse color
                        } else if (param.getSimpleName().equals("Color")) {
                            try {
                                value = param.getMethod("valueOf", String.class).invoke(null, valueString.toUpperCase());
                            } catch (Exception ex) {
                                throw parseToException("a horse color", valueString, methodName);
                            }
                            // Parse to horse style
                        } else if (param.getSimpleName().equals("Style")) {
                            try {
                                value = param.getMethod("valueOf", String.class).invoke(null, valueString.toUpperCase());
                            } catch (Exception ex) {
                                throw parseToException("a horse style", valueString, methodName);
                            }
                            // Parse to villager profession
                        } else if (param.getSimpleName().equals("Profession")) {
                            try {
                                value = param.getMethod("valueOf", String.class).invoke(null, valueString.toUpperCase());
                            } catch (Exception ex) {
                                throw parseToException("a villager profession", valueString, methodName);
                            }
                            // Parse to ocelot type
                        } else if (param.getSimpleName().equals("Art")) {
                            try {
                                value = param.getMethod("valueOf", String.class).invoke(null, valueString.toUpperCase());
                            } catch (Exception ex) {
                                ex.printStackTrace();
                                throw parseToException("a painting art", valueString, methodName);
                            }
                            // Parse to ocelot type
                        } else if (param.getSimpleName().equals("Type")) {
                            try {
                                value = param.getMethod("valueOf", String.class).invoke(null, valueString.toUpperCase());
                            } catch (Exception ex) {
                                throw parseToException("a ocelot type", valueString, methodName);
                            }

                            // Parse to potion effect
                        } else if (param == PotionEffectType.class) {
                            try {
                                PotionEffectType potionType = PotionEffectType.getByName(valueString.toUpperCase());
                                if (potionType == null && isNumeric(valueString)) {
                                    potionType = PotionEffectType.getById(Integer.parseInt(valueString));
                                }
                                if (potionType == null)
                                    throw new Exception();
                                value = potionType;
                            } catch (Exception ex) {
                                throw parseToException("a potioneffect type", valueString, methodName);
                            }
                        }
                    }
                    break;
                }
            }
            if (methodToUse == null) {
                throw new Exception(ChatColor.RED + "Cannot find the option " + methodName);
            }
            if (!usedOptions.contains(methodName.toLowerCase())) {
                usedOptions.add(methodName.toLowerCase());
            }
            doCheck(optionPermissions, usedOptions);
            methodToUse.invoke(disguise.getWatcher(), value);
        }
        // Alright. We've constructed our disguise.
        return disguise;
    }

    private void doCheck(HashSet<HashSet<String>> optionPermissions, ArrayList<String> usedOptions) throws Exception {
        if (!optionPermissions.isEmpty()) {
            boolean hasPermission = true;
            for (HashSet<String> perms : optionPermissions) {
                HashSet<String> cloned = (HashSet<String>) perms.clone();
                Iterator<String> itel = cloned.iterator();
                while (itel.hasNext()) {
                    String perm = itel.next();
                    if (perm.startsWith("-")) {
                        itel.remove();
                        if (usedOptions.contains(perm.substring(1))) {
                            hasPermission = false;
                            break;
                        }
                    }
                }
                // If this wasn't modified by the above check
                if (perms.size() == cloned.size()) {
                    // If there is a option used that the perms don't allow
                    if (!perms.containsAll(usedOptions)) {
                        hasPermission = false;
                    } else {
                        // The perms allow it. Return true
                        return;
                    }
                }
            }
            if (!hasPermission) {
                throw new Exception(ChatColor.RED + "You do not have the permission to use the option "
                        + usedOptions.get(usedOptions.size() - 1));
            }
        }
    }

    private Exception parseToException(String expectedValue, String receivedInstead, String methodName) {
        return new Exception(ChatColor.RED + "Expected " + ChatColor.GREEN + expectedValue + ChatColor.RED + ", received "
                + ChatColor.GREEN + receivedInstead + ChatColor.RED + " instead for " + ChatColor.GREEN + methodName);
    }

    private ItemStack parseToItemstack(String string) throws Exception {
        String[] split = string.split(":", -1);
        if (isNumeric(split[0])) {
            int itemId = Integer.parseInt(split[0]);
            short itemDura = 0;
            if (split.length > 1) {
                if (isNumeric(split[1])) {
                    itemDura = Short.parseShort(split[1]);
                } else {
                    throw parseToException("item ID:Durability combo", string, "%s");
                }
            }
            return new ItemStack(itemId, 1, itemDura);
        } else {
            if (split.length == 1) {
                throw parseToException("item ID", string, "%s");
            } else {
                throw parseToException("item ID:Durability combo", string, "%s");
            }
        }
    }

    protected abstract void sendCommandUsage(CommandSender sender);
}