001    package net.minecraft.src;
002    
003    import java.util.ArrayList;
004    import java.util.HashMap;
005    import java.util.Iterator;
006    import java.util.LinkedHashMap;
007    import java.util.List;
008    import java.util.Map;
009    import java.util.Random;
010    
011    public class EnchantmentHelper
012    {
013        /** Is the random seed of enchantment effects. */
014        private static final Random enchantmentRand = new Random();
015    
016        /**
017         * Used to calculate the extra armor of enchantments on armors equipped on player.
018         */
019        private static final EnchantmentModifierDamage enchantmentModifierDamage = new EnchantmentModifierDamage((Empty3)null);
020    
021        /**
022         * Used to calculate the (magic) extra damage done by enchantments on current equipped item of player.
023         */
024        private static final EnchantmentModifierLiving enchantmentModifierLiving = new EnchantmentModifierLiving((Empty3)null);
025    
026        /**
027         * Returns the level of enchantment on the ItemStack passed.
028         */
029        public static int getEnchantmentLevel(int par0, ItemStack par1ItemStack)
030        {
031            if (par1ItemStack == null)
032            {
033                return 0;
034            }
035            else
036            {
037                NBTTagList var2 = par1ItemStack.getEnchantmentTagList();
038    
039                if (var2 == null)
040                {
041                    return 0;
042                }
043                else
044                {
045                    for (int var3 = 0; var3 < var2.tagCount(); ++var3)
046                    {
047                        short var4 = ((NBTTagCompound)var2.tagAt(var3)).getShort("id");
048                        short var5 = ((NBTTagCompound)var2.tagAt(var3)).getShort("lvl");
049    
050                        if (var4 == par0)
051                        {
052                            return var5;
053                        }
054                    }
055    
056                    return 0;
057                }
058            }
059        }
060    
061        /**
062         * Return the enchantments for the specified stack.
063         */
064        public static Map getEnchantments(ItemStack par0ItemStack)
065        {
066            LinkedHashMap var1 = new LinkedHashMap();
067            NBTTagList var2 = par0ItemStack.getEnchantmentTagList();
068    
069            if (var2 != null)
070            {
071                for (int var3 = 0; var3 < var2.tagCount(); ++var3)
072                {
073                    short var4 = ((NBTTagCompound)var2.tagAt(var3)).getShort("id");
074                    short var5 = ((NBTTagCompound)var2.tagAt(var3)).getShort("lvl");
075                    var1.put(Integer.valueOf(var4), Integer.valueOf(var5));
076                }
077            }
078    
079            return var1;
080        }
081    
082        /**
083         * Set the enchantments for the specified stack.
084         */
085        public static void setEnchantments(Map par0Map, ItemStack par1ItemStack)
086        {
087            NBTTagList var2 = new NBTTagList();
088            Iterator var3 = par0Map.keySet().iterator();
089    
090            while (var3.hasNext())
091            {
092                int var4 = ((Integer)var3.next()).intValue();
093                NBTTagCompound var5 = new NBTTagCompound();
094                var5.setShort("id", (short)var4);
095                var5.setShort("lvl", (short)((Integer)par0Map.get(Integer.valueOf(var4))).intValue());
096                var2.appendTag(var5);
097            }
098    
099            if (var2.tagCount() > 0)
100            {
101                par1ItemStack.func_77983_a("ench", var2);
102            }
103            else if (par1ItemStack.hasTagCompound())
104            {
105                par1ItemStack.getTagCompound().removeTag("ench");
106            }
107        }
108    
109        /**
110         * Returns the biggest level of the enchantment on the array of ItemStack passed.
111         */
112        private static int getMaxEnchantmentLevel(int par0, ItemStack[] par1ArrayOfItemStack)
113        {
114            int var2 = 0;
115            ItemStack[] var3 = par1ArrayOfItemStack;
116            int var4 = par1ArrayOfItemStack.length;
117    
118            for (int var5 = 0; var5 < var4; ++var5)
119            {
120                ItemStack var6 = var3[var5];
121                int var7 = getEnchantmentLevel(par0, var6);
122    
123                if (var7 > var2)
124                {
125                    var2 = var7;
126                }
127            }
128    
129            return var2;
130        }
131    
132        /**
133         * Executes the enchantment modifier on the ItemStack passed.
134         */
135        private static void applyEnchantmentModifier(IEnchantmentModifier par0IEnchantmentModifier, ItemStack par1ItemStack)
136        {
137            if (par1ItemStack != null)
138            {
139                NBTTagList var2 = par1ItemStack.getEnchantmentTagList();
140    
141                if (var2 != null)
142                {
143                    for (int var3 = 0; var3 < var2.tagCount(); ++var3)
144                    {
145                        short var4 = ((NBTTagCompound)var2.tagAt(var3)).getShort("id");
146                        short var5 = ((NBTTagCompound)var2.tagAt(var3)).getShort("lvl");
147    
148                        if (Enchantment.enchantmentsList[var4] != null)
149                        {
150                            par0IEnchantmentModifier.calculateModifier(Enchantment.enchantmentsList[var4], var5);
151                        }
152                    }
153                }
154            }
155        }
156    
157        /**
158         * Executes the enchantment modifier on the array of ItemStack passed.
159         */
160        private static void applyEnchantmentModifierArray(IEnchantmentModifier par0IEnchantmentModifier, ItemStack[] par1ArrayOfItemStack)
161        {
162            ItemStack[] var2 = par1ArrayOfItemStack;
163            int var3 = par1ArrayOfItemStack.length;
164    
165            for (int var4 = 0; var4 < var3; ++var4)
166            {
167                ItemStack var5 = var2[var4];
168                applyEnchantmentModifier(par0IEnchantmentModifier, var5);
169            }
170        }
171    
172        /**
173         * Returns the modifier of protection enchantments on armors equipped on player.
174         */
175        public static int getEnchantmentModifierDamage(ItemStack[] par0ArrayOfItemStack, DamageSource par1DamageSource)
176        {
177            enchantmentModifierDamage.damageModifier = 0;
178            enchantmentModifierDamage.source = par1DamageSource;
179            applyEnchantmentModifierArray(enchantmentModifierDamage, par0ArrayOfItemStack);
180    
181            if (enchantmentModifierDamage.damageModifier > 25)
182            {
183                enchantmentModifierDamage.damageModifier = 25;
184            }
185    
186            return (enchantmentModifierDamage.damageModifier + 1 >> 1) + enchantmentRand.nextInt((enchantmentModifierDamage.damageModifier >> 1) + 1);
187        }
188    
189        /**
190         * Return the (magic) extra damage of the enchantments on player equipped item.
191         */
192        public static int getEnchantmentModifierLiving(EntityLiving par0EntityLiving, EntityLiving par1EntityLiving)
193        {
194            enchantmentModifierLiving.livingModifier = 0;
195            enchantmentModifierLiving.entityLiving = par1EntityLiving;
196            applyEnchantmentModifier(enchantmentModifierLiving, par0EntityLiving.getHeldItem());
197            return enchantmentModifierLiving.livingModifier > 0 ? 1 + enchantmentRand.nextInt(enchantmentModifierLiving.livingModifier) : 0;
198        }
199    
200        /**
201         * Returns the knockback value of enchantments on equipped player item.
202         */
203        public static int getKnockbackModifier(EntityLiving par0EntityLiving, EntityLiving par1EntityLiving)
204        {
205            return getEnchantmentLevel(Enchantment.knockback.effectId, par0EntityLiving.getHeldItem());
206        }
207    
208        public static int func_90036_a(EntityLiving par0EntityLiving)
209        {
210            return getEnchantmentLevel(Enchantment.fireAspect.effectId, par0EntityLiving.getHeldItem());
211        }
212    
213        /**
214         * Returns the 'Water Breathing' modifier of enchantments on player equipped armors.
215         */
216        public static int getRespiration(EntityLiving par0EntityLiving)
217        {
218            return getMaxEnchantmentLevel(Enchantment.respiration.effectId, par0EntityLiving.getLastActiveItems());
219        }
220    
221        /**
222         * Return the extra efficiency of tools based on enchantments on equipped player item.
223         */
224        public static int getEfficiencyModifier(EntityLiving par0EntityLiving)
225        {
226            return getEnchantmentLevel(Enchantment.efficiency.effectId, par0EntityLiving.getHeldItem());
227        }
228    
229        /**
230         * Returns the unbreaking enchantment modifier on current equipped item of player.
231         */
232        public static int getUnbreakingModifier(EntityLiving par0EntityLiving)
233        {
234            return getEnchantmentLevel(Enchantment.unbreaking.effectId, par0EntityLiving.getHeldItem());
235        }
236    
237        /**
238         * Returns the silk touch status of enchantments on current equipped item of player.
239         */
240        public static boolean getSilkTouchModifier(EntityLiving par0EntityLiving)
241        {
242            return getEnchantmentLevel(Enchantment.silkTouch.effectId, par0EntityLiving.getHeldItem()) > 0;
243        }
244    
245        /**
246         * Returns the fortune enchantment modifier of the current equipped item of player.
247         */
248        public static int getFortuneModifier(EntityLiving par0EntityLiving)
249        {
250            return getEnchantmentLevel(Enchantment.fortune.effectId, par0EntityLiving.getHeldItem());
251        }
252    
253        /**
254         * Returns the looting enchantment modifier of the current equipped item of player.
255         */
256        public static int getLootingModifier(EntityLiving par0EntityLiving)
257        {
258            return getEnchantmentLevel(Enchantment.looting.effectId, par0EntityLiving.getHeldItem());
259        }
260    
261        /**
262         * Returns the aqua affinity status of enchantments on current equipped item of player.
263         */
264        public static boolean getAquaAffinityModifier(EntityLiving par0EntityLiving)
265        {
266            return getMaxEnchantmentLevel(Enchantment.aquaAffinity.effectId, par0EntityLiving.getLastActiveItems()) > 0;
267        }
268    
269        /**
270         * Returns the enchantability of itemstack, it's uses a singular formula for each index (2nd parameter: 0, 1 and 2),
271         * cutting to the max enchantability power of the table (3rd parameter)
272         */
273        public static int calcItemStackEnchantability(Random par0Random, int par1, int par2, ItemStack par3ItemStack)
274        {
275            Item var4 = par3ItemStack.getItem();
276            int var5 = var4.getItemEnchantability();
277    
278            if (var5 <= 0)
279            {
280                return 0;
281            }
282            else
283            {
284                if (par2 > 15)
285                {
286                    par2 = 15;
287                }
288    
289                int var6 = par0Random.nextInt(8) + 1 + (par2 >> 1) + par0Random.nextInt(par2 + 1);
290                return par1 == 0 ? Math.max(var6 / 3, 1) : (par1 == 1 ? var6 * 2 / 3 + 1 : Math.max(var6, par2 * 2));
291            }
292        }
293    
294        /**
295         * Adds a random enchantment to the specified item. Args: random, itemStack, enchantabilityLevel
296         */
297        public static ItemStack addRandomEnchantment(Random par0Random, ItemStack par1ItemStack, int par2)
298        {
299            List var3 = buildEnchantmentList(par0Random, par1ItemStack, par2);
300    
301            if (var3 != null)
302            {
303                Iterator var4 = var3.iterator();
304    
305                while (var4.hasNext())
306                {
307                    EnchantmentData var5 = (EnchantmentData)var4.next();
308                    par1ItemStack.addEnchantment(var5.enchantmentobj, var5.enchantmentLevel);
309                }
310            }
311    
312            return par1ItemStack;
313        }
314    
315        /**
316         * Create a list of random EnchantmentData (enchantments) that can be added together to the ItemStack, the 3rd
317         * parameter is the total enchantability level.
318         */
319        public static List buildEnchantmentList(Random par0Random, ItemStack par1ItemStack, int par2)
320        {
321            Item var3 = par1ItemStack.getItem();
322            int var4 = var3.getItemEnchantability();
323    
324            if (var4 <= 0)
325            {
326                return null;
327            }
328            else
329            {
330                var4 /= 2;
331                var4 = 1 + par0Random.nextInt((var4 >> 1) + 1) + par0Random.nextInt((var4 >> 1) + 1);
332                int var5 = var4 + par2;
333                float var6 = (par0Random.nextFloat() + par0Random.nextFloat() - 1.0F) * 0.15F;
334                int var7 = (int)((float)var5 * (1.0F + var6) + 0.5F);
335    
336                if (var7 < 1)
337                {
338                    var7 = 1;
339                }
340    
341                ArrayList var8 = null;
342                Map var9 = mapEnchantmentData(var7, par1ItemStack);
343    
344                if (var9 != null && !var9.isEmpty())
345                {
346                    EnchantmentData var10 = (EnchantmentData)WeightedRandom.getRandomItem(par0Random, var9.values());
347    
348                    if (var10 != null)
349                    {
350                        var8 = new ArrayList();
351                        var8.add(var10);
352    
353                        for (int var11 = var7; par0Random.nextInt(50) <= var11; var11 >>= 1)
354                        {
355                            Iterator var12 = var9.keySet().iterator();
356    
357                            while (var12.hasNext())
358                            {
359                                Integer var13 = (Integer)var12.next();
360                                boolean var14 = true;
361                                Iterator var15 = var8.iterator();
362    
363                                while (true)
364                                {
365                                    if (var15.hasNext())
366                                    {
367                                        EnchantmentData var16 = (EnchantmentData)var15.next();
368    
369                                        if (var16.enchantmentobj.canApplyTogether(Enchantment.enchantmentsList[var13.intValue()]))
370                                        {
371                                            continue;
372                                        }
373    
374                                        var14 = false;
375                                    }
376    
377                                    if (!var14)
378                                    {
379                                        var12.remove();
380                                    }
381    
382                                    break;
383                                }
384                            }
385    
386                            if (!var9.isEmpty())
387                            {
388                                EnchantmentData var17 = (EnchantmentData)WeightedRandom.getRandomItem(par0Random, var9.values());
389                                var8.add(var17);
390                            }
391                        }
392                    }
393                }
394    
395                return var8;
396            }
397        }
398    
399        /**
400         * Creates a 'Map' of EnchantmentData (enchantments) possible to add on the ItemStack and the enchantability level
401         * passed.
402         */
403        public static Map mapEnchantmentData(int par0, ItemStack par1ItemStack)
404        {
405            Item var2 = par1ItemStack.getItem();
406            HashMap var3 = null;
407            Enchantment[] var4 = Enchantment.enchantmentsList;
408            int var5 = var4.length;
409    
410            for (int var6 = 0; var6 < var5; ++var6)
411            {
412                Enchantment var7 = var4[var6];
413    
414                if (var7 != null && var7.canEnchantItem(par1ItemStack))
415                {
416                    for (int var8 = var7.getMinLevel(); var8 <= var7.getMaxLevel(); ++var8)
417                    {
418                        if (par0 >= var7.getMinEnchantability(var8) && par0 <= var7.getMaxEnchantability(var8))
419                        {
420                            if (var3 == null)
421                            {
422                                var3 = new HashMap();
423                            }
424    
425                            var3.put(Integer.valueOf(var7.effectId), new EnchantmentData(var7, var8));
426                        }
427                    }
428                }
429            }
430    
431            return var3;
432        }
433    }