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/* The MIT License (MIT)
 *
 * Copyright (c) 2015 Reinventing Geospatial, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.rgi.geopackage.features;

import com.rgi.geopackage.utility.DatabaseUtility;

import java.util.EnumSet;

/**
 * Object to capture a column's definition: name, type, and constraints
 * 

 * 

 * Supported constraints:
 * 

 * 
 *     Flags (primary key, auto increment, not null, unique
 *     Check
 *     Default
 * 
 * Currently unsupported constraints:
 * 

 * 
 *     Primary key asc/desc
 *     Conflict clauses
 *     Collate
 *     Foreign Key
 * 
 * For a picture of SQLite's full range of supported constraints see: SQLite's create table
 * documentation
 *
 * @author Luke Lambert
 *
 */
@SuppressWarnings("AbstractClassWithoutAbstractMethods")
public abstract class AbstractColumnDefinition
{
    /**
     * Constructor
     *
     * @param name
     *             Column name
     * @param type
     *             Column type
     * @param checkExpression
     *             SQLite "check" expression. Ignored if null.  Each time a new
     *             row is inserted into the table or an existing row is
     *             updated, the expression associated with each CHECK
     *             constraint is evaluated and cast to a NUMERIC value in the
     *             same way as a CAST expression. If the result is zero
     *             (integer value 0 or real value 0.0), then a constraint
     *             violation has occurred. If the CHECK expression evaluates
     *             to NULL, or any other non-zero value, it is not a constraint
     *             violation. The expression of a CHECK constraint may not
     *             contain a subquery.
     * @param flags
     *             Column constraint flags
     * @param defaultValue
     *             Column default value
     * @param comment
     *             Comment to be added to the table definition. Ignored if
     *             null.
     */
    protected AbstractColumnDefinition(final String              name,
                                       final String              type,
                                       final EnumSet flags,
                                       final String              checkExpression,
                                       final ColumnDefault       defaultValue,
                                       final String              comment)
    {
        DatabaseUtility.validateColumnName(name);

        if(type == null || type.isEmpty())
        {
            throw new IllegalArgumentException("The column type may not be null or empty");
        }

        this.flags = flags == null ? EnumSet.noneOf(ColumnFlag.class)
                                   : flags;

        if(defaultValue == null)
        {
            throw new IllegalArgumentException("The default type may not be null. Use ColumnDefault.Null to specify a null value, or ColumnDefault.None to leave the default unspecified.");
        }

        if( this.flags.contains(ColumnFlag.NotNull)    &&
           !this.flags.contains(ColumnFlag.PrimaryKey) &&   // Ignore primary keys. They're always auto-increment, and can not use a default value
           (defaultValue.equals(ColumnDefault.None) ||
            defaultValue.equals(ColumnDefault.Null)))
        {
            throw new IllegalArgumentException("Column flags that specify that values may not be null must provide a default column value other than ColumnDefault.None or ColumnDefault.Null");
        }

        this.name            = name;
        this.type            = type;
        this.checkExpression = checkExpression;
        this.defaultValue    = defaultValue;
        this.comment         = comment;

        if(this.comment != null && this.comment.contains("\n"))
        {
            throw new IllegalArgumentException("The comment may not contain any line break characters");
        }
    }

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

    public String getType()
    {
        return this.type;
    }

    /**
     * Determines if a column definition includes a particular column
     * constraint flag
     *
     * @param columnFlag
     *             Flag to check the presence of
     * @return true if this column was defined with the particular column flag
     */
    public boolean hasFlag(final ColumnFlag columnFlag)
    {
        return this.flags.contains(columnFlag);
    }

    public String getCheckExpression()
    {
        return this.checkExpression;
    }

    public ColumnDefault getDefaultValue()
    {
        return this.defaultValue;
    }

    public String getComment()
    {
        return this.comment;
    }

    private final String              name;
    private final String              type;
    private final EnumSet flags;
    private final String              checkExpression;
    private final ColumnDefault       defaultValue;
    private final String              comment;

}