package com.pahimar.ee3.imc;

import java.util.EnumSet;
import java.util.List;

import net.minecraft.item.ItemStack;

import com.google.common.collect.ImmutableList;
import com.google.gson.Gson;
import com.pahimar.ee3.EquivalentExchange3;
import com.pahimar.ee3.api.RecipeMapping;
import com.pahimar.ee3.api.StackValueMapping;
import com.pahimar.ee3.emc.EmcRegistry;
import com.pahimar.ee3.emc.EmcValue;
import com.pahimar.ee3.emc.EmcValuesIMC;
import com.pahimar.ee3.item.WrappedStack;
import com.pahimar.ee3.item.crafting.RecipesIMC;
import com.pahimar.ee3.lib.Reference;

import cpw.mods.fml.common.IScheduledTickHandler;
import cpw.mods.fml.common.ITickHandler;
import cpw.mods.fml.common.TickType;
import cpw.mods.fml.common.event.FMLInterModComms;
import cpw.mods.fml.common.event.FMLInterModComms.IMCEvent;
import cpw.mods.fml.common.event.FMLInterModComms.IMCMessage;

public class InterModCommsHandler implements ITickHandler, IScheduledTickHandler{

    private static Gson gson = new Gson();
    
    // TODO Logging
    
    public static void processIMCMessages(IMCEvent event) {
        
        for (IMCMessage imcMessage : event.getMessages()) {
            processIMCMessage(imcMessage);
        }
    }
    
    public static void processIMCMessage(IMCMessage imcMessage) {
        
        String requestedOperation = imcMessage.key;

        if (requestedOperation.equalsIgnoreCase(InterModCommsOperations.RECIPE_ADD)) {
            processAddRecipeMessage(imcMessage);
        }
        else if (requestedOperation.equalsIgnoreCase(InterModCommsOperations.EMC_ASSIGN_VALUE_PRE)) {
            processPreAssignEmcValueMessage(imcMessage);
        }
        else if (requestedOperation.equalsIgnoreCase(InterModCommsOperations.EMC_ASSIGN_VALUE_POST)) {
            processPostAssignEmcValueMessage(imcMessage);
        }
        else if (requestedOperation.equalsIgnoreCase(InterModCommsOperations.EMC_HAS_VALUE)) {
            processHasEmcValueMessage(imcMessage);
        }
        else if (requestedOperation.equalsIgnoreCase(InterModCommsOperations.EMC_GET_VALUE)) {
            processGetEmcValueMessage(imcMessage);
        }
    }

    private static void processAddRecipeMessage(IMCMessage imcMessage) {

        if (imcMessage.getMessageType() == String.class) {
            
            RecipeMapping recipeMapping = RecipeMapping.createFromJson(imcMessage.getStringValue());
            
            if (recipeMapping != null) {
                
                WrappedStack outputWrappedStack = recipeMapping.outputWrappedStack;
                List<WrappedStack> inputWrappedStacks = recipeMapping.inputWrappedStacks;
                
                RecipesIMC.addRecipe(outputWrappedStack, inputWrappedStacks);
            }
            else {
                // TODO Log that the message payloads json was invalid
            }
        }
        else {
            // TODO Log that the message payload is of an invalid type
        }
    }

    private static void processPreAssignEmcValueMessage(IMCMessage imcMessage) {

        if (imcMessage.getMessageType() == String.class) {
            
            StackValueMapping stackValueMapping = StackValueMapping.createFromJson(imcMessage.getStringValue());
            
            if (stackValueMapping != null) {
                
                WrappedStack wrappedStack = stackValueMapping.wrappedStack;
                EmcValue emcValue = stackValueMapping.emcValue;
                
                EmcValuesIMC.addPreAssignedValued(wrappedStack, emcValue);
            }
            else {
                // TODO Log that the message payloads json was invalid
            }
        }
        else {
            // TODO Log that the message payload is of an invalid type
        }
    }
    
    private static void processPostAssignEmcValueMessage(IMCMessage imcMessage) {

        if (imcMessage.getMessageType() == String.class) {
            
            StackValueMapping stackValueMapping = StackValueMapping.createFromJson(imcMessage.getStringValue());
            
            if (stackValueMapping != null) {
                
                WrappedStack wrappedStack = stackValueMapping.wrappedStack;
                EmcValue emcValue = stackValueMapping.emcValue;
                
                EmcValuesIMC.addPostAssignedValued(wrappedStack, emcValue);
            }
            else {
                // TODO Log that the message payloads json was invalid
            }
        }
        else {
            // TODO Log that the message payload is of an invalid type
        }
    }
    
    private static void processHasEmcValueMessage(IMCMessage imcMessage) {

        if (imcMessage.getMessageType() == String.class) {
            
            WrappedStack wrappedStack = WrappedStack.createFromJson(imcMessage.getStringValue());
            
            if (wrappedStack != null) {
                FMLInterModComms.sendRuntimeMessage(
                        EquivalentExchange3.instance, 
                        imcMessage.getSender(), 
                        InterModCommsOperations.EMC_RETURN_HAS_VALUE, 
                        String.format("%s==%s", imcMessage.getStringValue(), String.valueOf(EmcRegistry.hasEmcValue(wrappedStack))));
            }
            else {
                // TODO Log that the message payloads json was invalid
            }
        }
        else if (imcMessage.getMessageType() == ItemStack.class) {
            
            ItemStack itemStack = imcMessage.getItemStackValue();

            if (itemStack != null) {
                FMLInterModComms.sendRuntimeMessage(
                        EquivalentExchange3.instance, 
                        imcMessage.getSender(), 
                        InterModCommsOperations.EMC_RETURN_HAS_VALUE, 
                        String.format("%s==%s", gson.toJson(itemStack), String.valueOf(EmcRegistry.hasEmcValue(itemStack))));
            }
            else {
                // TODO Logging
            }
        }
        else {
            // TODO Log that the message payload is of an invalid type
        }
    }
    
    private static void processGetEmcValueMessage(IMCMessage imcMessage) {
        
        if (imcMessage.getMessageType() == String.class) {
            
            WrappedStack wrappedStack = WrappedStack.createFromJson(imcMessage.getStringValue());
            
            if (wrappedStack != null) {
                FMLInterModComms.sendRuntimeMessage(
                        EquivalentExchange3.instance, 
                        imcMessage.getSender(), 
                        InterModCommsOperations.EMC_RETURN_GET_VALUE, 
                        String.format("%s==%s", imcMessage.getStringValue(), EmcRegistry.getEmcValue(wrappedStack).toJson()));
            }
            else {
                // TODO Log that the message payloads json was invalid
            }
        }
        else if (imcMessage.getMessageType() == ItemStack.class) {
            
            /*
             * Reply back to the mod that queried for the existance of an EmcValue for the given ItemStack
             */
            ItemStack itemStack = imcMessage.getItemStackValue();
            
            FMLInterModComms.sendRuntimeMessage(
                    EquivalentExchange3.instance, 
                    imcMessage.getSender(), 
                    InterModCommsOperations.EMC_RETURN_GET_VALUE, 
                    String.format("%s==%s", gson.toJson(itemStack), EmcRegistry.getEmcValue(itemStack).toJson()));

        }
        else {
            // TODO Log that the message payload is of an invalid type
        }
    }
    
    /**
     * Runtime fetching and processing of IMC messages
     */
    @Override
    public void tickStart(EnumSet<TickType> type, Object... tickData) {

    }

    @Override
    public void tickEnd(EnumSet<TickType> type, Object... tickData) {

        for (TickType tickType : type) {
            
            if (tickType == TickType.SERVER) {
                
                ImmutableList<IMCMessage> runtimeIMCMessages = FMLInterModComms.fetchRuntimeMessages(EquivalentExchange3.instance);
                
                for (IMCMessage imcMessage : runtimeIMCMessages) {
                    InterModCommsHandler.processIMCMessage(imcMessage);
                }
            }
        }
    }

    @Override
    public EnumSet<TickType> ticks() {

        return EnumSet.of(TickType.SERVER);
    }

    @Override
    public String getLabel() {

        return Reference.MOD_NAME + ": " + this.getClass().getSimpleName();
    }

    @Override
    public int nextTickSpacing() {

        return 10;
    }
}