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/*
 * Copyright 2016 Goldman Sachs.
 *
 * 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.gs.dmn.validation.table;

import com.gs.dmn.runtime.DMNRuntimeException;

import java.text.DecimalFormat;
import java.util.Comparator;
import java.util.Objects;

public class Bound {
    static final Double ZERO = 0.0D;
    static final Double ONE = 1.0D;
    public static final Double MINUS_INFINITY = -Double.MAX_VALUE;
    public static final Double PLUS_INFINITY = Double.MAX_VALUE;
    static final Double DELTA = 0.00001D;
    private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("#.#");

    public static Comparator COMPARATOR = (o1, o2) -> {
        if (o1 == null && o2 == null) {
            return 0;
        } else if (o1 == null) {
            return 1;
        } else if (o2 == null) {
            return -1;
        } else {
            if (o1.value == null && o2.value == null) {
                return 0;
            } else if (o1.value == null) {
                return 1;
            } else if (o2.value == null) {
                return -1;
            } else {
                double diff = o1.compareValue() - o2.compareValue();
                if (diff < 0) {
                    return -1;
                } else if (diff > 0) {
                    return 1;
                } else {
                    return 0;
                }
            }
        }
    };

    public static boolean sameValue(Bound b1, Bound b2) {
        if (b1 == null || b2 == null) {
            throw new DMNRuntimeException(String.format("Unexpected null bound '%s' or '%s'", b1, b2));
        }

        return Objects.equals(b1.value, b2.value);
    }

    public static boolean sameEnd(Bound b1, Bound b2) {
        if (b1 == null || b2 == null) {
            throw new DMNRuntimeException(String.format("Unexpected null bound '%s' or '%s'", b1, b2));
        }

        return sameValue(b1, b2)
                && b1.isIncluded == b2.isIncluded;
    }

    public static boolean areAdjacent(Bound b1, Bound b2) {
        if (b1 == null || b2 == null) {
            throw new DMNRuntimeException(String.format("Unexpected null bound '%s' or '%s'", b1, b2));
        }

        return b1.areAdjacent(b2);
    }

    private final Interval interval;
    private final boolean isLowerBound;
    private final boolean isIncluded;
    private final Number value;

    public Bound(Interval interval, boolean lowerBound, boolean isIncluded, Number value) {
        this.interval = interval;
        this.isLowerBound = lowerBound;
        this.isIncluded = isIncluded;
        this.value = value;
    }

    public Interval getInterval() {
        return interval;
    }

    public boolean isLowerBound() {
        return isLowerBound;
    }

    public boolean isIncluded() {
        return isIncluded;
    }

    public Number getValue() {
        return value;
    }

    private boolean areAdjacent(Bound o) {
        if (this == o) return true;
        if (o == null || this.interval.getClass() != o.interval.getClass()) return false;

        if (this.interval.getClass() == NumericInterval.class) {
             return (isIncluded || o.isIncluded) && sameValue(this, o);
        } else if (this.interval.getClass() == EnumerationInterval.class) {
            return sameValue(this, o);
        }
        return false;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Bound bound = (Bound) o;
        return isLowerBound == bound.isLowerBound && isIncluded == bound.isIncluded && Objects.equals(interval, bound.interval) && Objects.equals(value, bound.value);
    }

    @Override
    public int hashCode() {
        return Objects.hash(interval, isLowerBound, isIncluded, value);
    }

    @Override
    public String toString() {
        if (isLowerBound) {
            return String.format("%s%s", isIncluded ? "[" : "(", serialize(value));
        } else {
            return String.format("%s%s", serialize(value), isIncluded ? "]" : ")");
        }
    }

    private String serialize(Number value) {
        if (value == null) {
            return null;
        } else if (MINUS_INFINITY.equals(value)) {
            return "-Infinity";
        } else if (PLUS_INFINITY.equals(value)) {
            return "+Infinity";
        } else {
            return DECIMAL_FORMAT.format(value);
        }
    }

    private double compareValue() {
        if (isIncluded) {
            return this.value.doubleValue();
        } else if (isLowerBound) {
            return this.value.doubleValue() + DELTA;
        } else {
            return this.value.doubleValue() - DELTA;
        }
    }
}