/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.codegen;

class ExpressionToString implements ExpressionVisitor {
    private final StringBuilder result;

    ExpressionToString(StringBuilder result) {
        this.result = result;
    }

    @Override
    public void invoke(Expression target, MethodReference method, Expression[] arguments) {
        result.append("invoke{target=");
        target.accept(this);
        result.append(", method=");
        method.writeTo(result);
        result.append("}(");
        String sep = "";
        for (Expression argument : arguments) {
            result.append(sep);
            argument.accept(this);
            sep = ", ";
        }
        result.append(')');
    }

    @Override
    public void invoke(MethodReference method, Expression[] arguments) {
        result.append("invoke{method=");
        method.writeTo(result);
        result.append("}(");
        String sep = "";
        for (Expression argument : arguments) {
            result.append(sep);
            argument.accept(this);
            sep = ", ";
        }
        result.append(')');
    }

    @Override
    public void load(LocalVariable variable) {
        result.append("load{type=");
        if (variable.type() == null) {
            result.append("null");
        } else {
            variable.type().writeTo(result);
        }
        result.append(", name=").append(variable.name()).append('}');
    }

    @Override
    public void arrayLoad(Expression array, Expression index) {
        result.append("loadArray{array=");
        array.accept(this);
        result.append(", index=");
        index.accept(this);
        result.append('}');
    }

    @Override
    public void arraySet(Expression array, Expression index, Expression value) {
        result.append("setArray{array=");
        array.accept(this);
        result.append(", index=");
        index.accept(this);
        result.append(", value=");
        value.accept(this);
        result.append('}');
    }

    @Override
    public void arrayLength(Expression array) {
        result.append("length{array=");
        array.accept(this);
        result.append('}');
    }

    @Override
    public void getField(Expression target, FieldReference field) {
        result.append("get{target=");
        target.accept(this);
        result.append(", field=").append(field.name()).append('}');
    }

    @Override
    public void constant(Object value) {
        result.append("constant(").append(value).append(')');
    }

    @Override
    public void getStatic(FieldReference field) {
        result.append("get{class=").append(field.owner());
        result.append(", field=").append(field.name()).append('}');
    }

    @Override
    public void loadThis(String sourceName) {
        result.append("load{").append(sourceName).append('}');
    }

    @Override
    public void newInstance(TypeReference type) {
        result.append("new{type=");
        type.writeTo(result);
        result.append('}');
    }

    @Override
    public void not(Expression expression) {
        result.append("not(");
        expression.accept(this);
        result.append(')');
    }

    @Override
    public void ternary(Expression test, Expression onTrue, Expression onFalse) {
        result.append("ternary{test=");
        test.accept(this);
        result.append(", onTrue=");
        onTrue.accept(this);
        result.append(", onFalse=");
        onFalse.accept(this);
        result.append('}');
    }

    @Override
    public void equal(Expression lhs, Expression rhs) {
        result.append("equal(");
        lhs.accept(this);
        result.append(", ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void notEqual(Expression lhs, Expression rhs) {
        result.append("notEqual(");
        lhs.accept(this);
        result.append(", ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void isNull(Expression expression) {
        result.append("isNull(");
        expression.accept(this);
        result.append(')');
    }

    @Override
    public void notNull(Expression expression) {
        result.append("notNull(");
        expression.accept(this);
        result.append(')');
    }

    @Override
    public void or(Expression... expressions) {
        boolOp("or(", expressions);
    }

    @Override
    public void and(Expression... expressions) {
        boolOp("and(", expressions);
    }

    private void boolOp(String sep, Expression[] expressions) {
        for (Expression expression : expressions) {
            result.append(sep);
            expression.accept(this);
            sep = ", ";
        }
        result.append(')');
    }

    @Override
    public void add(Expression lhs, Expression rhs) {
        result.append("add(");
        lhs.accept(this);
        result.append(" + ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void gt(Expression lhs, Expression rhs) {
        result.append("gt(");
        lhs.accept(this);
        result.append(" > ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void gte(Expression lhs, Expression rhs) {
        result.append("gt(");
        lhs.accept(this);
        result.append(" >= ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void lt(Expression lhs, Expression rhs) {
        result.append("lt(");
        lhs.accept(this);
        result.append(" < ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void lte(Expression lhs, Expression rhs) {
        result.append("gt(");
        lhs.accept(this);
        result.append(" <= ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void subtract(Expression lhs, Expression rhs) {
        result.append("sub(");
        lhs.accept(this);
        result.append(" - ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void multiply(Expression lhs, Expression rhs) {
        result.append("mul(");
        lhs.accept(this);
        result.append(" * ");
        rhs.accept(this);
        result.append(')');
    }

    private void div(Expression lhs, Expression rhs) {
        result.append("div(");
        lhs.accept(this);
        result.append(" / ");
        rhs.accept(this);
        result.append(')');
    }

    @Override
    public void cast(TypeReference type, Expression expression) {
        result.append("cast{type=");
        type.writeTo(result);
        result.append(", expression=");
        expression.accept(this);
        result.append('}');
    }

    @Override
    public void instanceOf(TypeReference type, Expression expression) {
        result.append("instanceOf{type=");
        type.writeTo(result);
        result.append(", expression=");
        expression.accept(this);
        result.append('}');
    }

    @Override
    public void newInitializedArray(TypeReference type, Expression... constants) {
        result.append("newArray{type=");
        type.writeTo(result);
        result.append(", constants=");
        String sep = "";
        for (Expression constant : constants) {
            result.append(sep);
            constant.accept(this);
            sep = ", ";
        }
        result.append('}');
    }

    @Override
    public void newArray(TypeReference type, int size) {
        result.append("newArray{type=");
        type.writeTo(result);
        result.append(", size=").append(size).append('}');
    }

    @Override
    public void newArray(TypeReference type, Expression size) {
        result.append("newArray{type=");
        type.writeTo(result);
        result.append(", size=");
        size.accept(this);
        result.append('}');
    }

    @Override
    public void longToDouble(Expression expression) {
        result.append("(double)");
        expression.accept(this);
    }

    @Override
    public void pop(Expression expression) {
        result.append("pop(");
        expression.accept(this);
        result.append(')');
    }

    @Override
    public void box(Expression expression) {
        result.append("box(");
        expression.accept(this);
        result.append(')');
    }

    @Override
    public void unbox(Expression expression) {
        result.append("unbox(");
        expression.accept(this);
        result.append(')');
    }
}
