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/*
 * Copyright (c) 2008-2014 MongoDB, 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 org.bson.json;

import org.bson.BsonWriterSettings;

/**
 * Settings to control the behavior of a {@code JSONWriter} instance.
 *
 * @see JsonWriter
 * @since 3.0
 */
public class JsonWriterSettings extends BsonWriterSettings {
    private final boolean indent;
    private final String newLineCharacters;
    private final String indentCharacters;
    private final JsonMode outputMode;

    /**
     * Creates a new instance with default values for all properties.
     */
    public JsonWriterSettings() {
        this(JsonMode.STRICT, false, null, null);
    }

    /**
     * Creates a new instance with the given output mode and default values for all other properties.
     *
     * @param outputMode the output mode
     */
    public JsonWriterSettings(final JsonMode outputMode) {
        this(outputMode, false, null, null);
    }

    /**
     * Creates a new instance with indent mode enabled, and the default value for all other properties.
     *
     * @param indent whether indent mode is enabled
     */
    public JsonWriterSettings(final boolean indent) {
        this(JsonMode.STRICT, indent, indent ? "  " : null, null);
    }

    /**
     * Creates a new instance with the given output mode, indent mode enabled, and the default value for all other properties.
     *
     * @param outputMode the output mode
     * @param indent     whether indent mode is enabled
     */
    public JsonWriterSettings(final JsonMode outputMode, final boolean indent) {
        this(outputMode, indent, indent ? "  " : null, null);
    }

    /**
     * Creates a new instance with the given values for all properties, indent mode enabled and the default value of {@code
     * newLineCharacters}.
     *
     * @param outputMode       the output mode
     * @param indentCharacters the indent characters
     */
    public JsonWriterSettings(final JsonMode outputMode, final String indentCharacters) {
        this(outputMode, true, indentCharacters, null);
    }

    /**
     * Creates a new instance with the given values for all properties and indent mode enabled.
     *
     * @param outputMode        the output mode
     * @param indentCharacters  the indent characters
     * @param newLineCharacters the new line character(s) to use
     */
    public JsonWriterSettings(final JsonMode outputMode, final String indentCharacters, final String newLineCharacters) {
        this(outputMode, true, indentCharacters, newLineCharacters);
    }

    private JsonWriterSettings(final JsonMode outputMode, final boolean indent, final String indentCharacters,
                               final String newLineCharacters) {
        if (indent) {
            if (indentCharacters == null) {
                throw new IllegalArgumentException("indent characters can not be null if indent is enabled");
            }
        } else {
            if (newLineCharacters != null) {
                throw new IllegalArgumentException("new line characters can not be null if indent is disabled.");
            }
            if (indentCharacters != null) {
                throw new IllegalArgumentException("indent characters can not be null if indent is disabled.");
            }
        }
        if (outputMode == null) {
            throw new IllegalArgumentException("output mode can not be null");
        }

        this.indent = indent;
        this.newLineCharacters = newLineCharacters != null ? newLineCharacters : System.getProperty("line.separator");
        this.indentCharacters = indentCharacters;
        this.outputMode = outputMode;
    }

    /**
     * The indentation mode.  If true, output will be indented.  Otherwise, it will all be on the same line. The default value is {@code
     * false}.
     *
     * @return whether output should be indented.
     */
    public boolean isIndent() {
        return indent;
    }

    /**
     * The new line character(s) to use if indent mode is enabled.  The default value is {@code System.getProperty("line.separator")}.
     *
     * @return the new line character(s) to use.
     */
    public String getNewLineCharacters() {
        return newLineCharacters;
    }

    /**
     * The indent characters to use if indent mode is enabled.  The default value is two spaces.
     *
     * @return the indent characters to use.
     */
    public String getIndentCharacters() {
        return indentCharacters;
    }

    /**
     * The output mode to use.  The default value is {@code }JSONMode.STRICT}.
     *
     * @return the output mode.
     */
    public JsonMode getOutputMode() {
        return outputMode;
    }
}