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/*
 * Copyright 2015 Google Inc.
 *
 * 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 com.palantir.javaformat;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.google.common.base.MoreObjects;
import com.google.errorprone.annotations.Immutable;
import com.palantir.javaformat.doc.Break;
import com.palantir.javaformat.doc.BreakTag;
import com.palantir.javaformat.doc.Level;
import com.palantir.javaformat.doc.State;

/**
 * An indent for a {@link Level} or {@link Break}. The indent is either a constant {@code int}, or a conditional
 * expression whose value depends on whether or not a {@link Break} has been broken.
 */
@Immutable
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
public abstract class Indent {

    public abstract int eval(State state);

    /** A constant function, returning a constant indent. */
    @JsonTypeName("const")
    public static final class Const extends Indent {
        @JsonProperty("amount")
        private final int n;

        public static final Const ZERO = new Const(+0);

        private Const(int n) {
            this.n = n;
        }

        public static Const make(int n, int indentMultiplier) {
            return new Const(n * indentMultiplier);
        }

        @Override
        public int eval(State _state) {
            return n;
        }

        @Override
        public String toString() {
            return MoreObjects.toStringHelper(this).add("n", n).toString();
        }
    }

    /** A conditional function, whose value depends on whether a break was taken. */
    @JsonTypeName("if")
    public static final class If extends Indent {
        @JsonProperty
        private final BreakTag condition;

        @JsonProperty
        private final Indent thenIndent;

        @JsonProperty
        private final Indent elseIndent;

        private If(BreakTag condition, Indent thenIndent, Indent elseIndent) {
            this.condition = condition;
            this.thenIndent = thenIndent;
            this.elseIndent = elseIndent;
        }

        public static If make(BreakTag condition, Indent thenIndent, Indent elseIndent) {
            return new If(condition, thenIndent, elseIndent);
        }

        @Override
        public int eval(State state) {
            return (state.wasBreakTaken(condition) ? thenIndent : elseIndent).eval(state);
        }

        @Override
        public String toString() {
            return MoreObjects.toStringHelper(this)
                    .add("condition", condition)
                    .add("thenIndent", thenIndent)
                    .add("elseIndent", elseIndent)
                    .toString();
        }
    }
}