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/*
 * Copyright 2008-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.hasor.dataql.compiler.qil;
import net.hasor.dataql.compiler.QueryCompilerException;
import net.hasor.dataql.runtime.CompilerArguments;
import net.hasor.utils.StringUtils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

import static net.hasor.dataql.compiler.qil.Opcodes.LINE;

/**
 * QL 指令序列
 * @author 赵永春 ([email protected])
 * @version : 2017-07-03
 */
public class InstQueue {
    private final     int                               name;
    private final     AtomicInteger                     labelIndex;
    private final     AtomicInteger                     methodName;
    private final     List> instSet;
    private final     CompilerArguments                 compilerArguments;
    private transient Object[]                          lastLine;

    public InstQueue(CompilerArguments compilerArguments) {
        this.name = 0;
        this.labelIndex = new AtomicInteger(0);
        this.methodName = new AtomicInteger(0);
        this.instSet = new ArrayList<>();
        this.instSet.add(new LinkedList<>());
        this.compilerArguments = compilerArguments;
    }

    private InstQueue(CompilerArguments compilerArguments, int methodName, InstQueue dataPool) {
        this.name = methodName;
        this.labelIndex = dataPool.labelIndex;
        this.methodName = dataPool.methodName;
        this.instSet = dataPool.instSet;
        this.compilerArguments = compilerArguments;
    }

    public int getName() {
        return this.name;
    }

    /** 添加指令 */
    public int inst(byte inst, Object... param) {
        // .如果行号信息没变那么忽略
        if (inst == LINE) {
            boolean focus = (Boolean) param[0];
            param = Arrays.copyOfRange(param, 1, param.length);
            if (!focus && testSameLine(param)) {
                return this.instSet.get(this.name).size() - 1;
            }
            //
            this.lastLine = param;
        }
        //
        // .加入到指令集
        LinkedList instList = this.instSet.get(this.name);
        InstructionInfo instObj = new InstructionInfo(inst, param);
        instList.addLast(instObj);
        int index = instList.size() - 1;
        //
        // .Label指令索引更新
        if (inst == Opcodes.LABEL) {
            for (Object obj : param) {
                if (obj instanceof Label) {
                    ((Label) obj).updateIndex(index);
                }
            }
        }
        return index;
    }

    CompilerArguments getCompilerArguments() {
        return this.compilerArguments;
    }

    private boolean testSameLine(Object[] param) {
        if (this.lastLine == null) {
            return false;
        } else {
            for (int i = 0; i < this.lastLine.length; i++) {
                Object lastLine = this.lastLine[i];
                Object targetLine = param[i];
                if (!lastLine.toString().equals(targetLine.toString())) {
                    return false;
                }
            }
            return true;
        }
    }

    /** 最后加入的那条指令 */
    public InstructionInfo lastInst() {
        LinkedList instList = this.instSet.get(this.name);
        return instList.isEmpty() ? null : instList.getLast();
    }

    /** 新函数指令集 */
    public InstQueue newMethodInst() {
        LinkedList instList = new LinkedList<>();
        this.instSet.add(instList);
        int name = -1;
        for (int i = 0; i < this.instSet.size(); i++) {
            if (this.instSet.get(i) == instList) {
                name = i;
                break;
            }
        }
        return new InstQueue(this.compilerArguments, name, this);
    }

    public Label labelDef() {
        return new Label(this.labelIndex.incrementAndGet());
    }

    public Instruction[][] buildArrays() throws QueryCompilerException {
        for (LinkedList instList : this.instSet) {
            for (InstructionInfo inst : instList) {
                if (!inst.replaceLabel()) {
                    throw new QueryCompilerException("compiler error -> inst(" + inst.getInstCode() + ") encounter not insert Label.");
                }
            }
        }
        //
        InstructionInfo[][] buildData = new InstructionInfo[this.instSet.size()][];
        for (int i = 0; i < this.instSet.size(); i++) {
            LinkedList instList = this.instSet.get(i);
            InstructionInfo[] instSet = instList.toArray(new InstructionInfo[0]);
            buildData[i] = instSet;
        }
        return buildData;
    }

    @Override
    public String toString() {
        StringBuilder strBuffer = new StringBuilder();
        for (int i = 0; i < this.instSet.size(); i++) {
            LinkedList instList = this.instSet.get(i);
            printInstList(i, instList, strBuffer);
        }
        return strBuffer.toString();
    }

    private static void printInstList(int name, LinkedList instList, StringBuilder strBuffer) {
        strBuffer.append("[");
        strBuffer.append(name);
        strBuffer.append("]\n");
        int length = String.valueOf(instList.size()).length();
        for (int i = 0; i < instList.size(); i++) {
            InstructionInfo inst = instList.get(i);
            strBuffer.append("  #");
            strBuffer.append(StringUtils.leftPad(String.valueOf(i), length, '0'));
            strBuffer.append("  ");
            strBuffer.append(inst.toString());
            strBuffer.append("\n");
        }
        strBuffer.append("\n");
    }
}