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package liquibase.dbdoc;

import liquibase.change.Change;
import liquibase.database.Database;
import liquibase.structure.core.Column;
import liquibase.structure.core.ForeignKey;
import liquibase.structure.core.Index;
import liquibase.structure.core.PrimaryKey;
import liquibase.structure.core.Table;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class TableWriter extends HTMLWriter {

    public TableWriter(File rootOutputDir, Database database) {
        super(new File(rootOutputDir, "tables"), database);
    }

    @Override
    protected String createTitle(Object object) {
        return "Changes affecting table \""+object.toString() + "\"";
    }

    @Override
    protected void writeCustomHTML(FileWriter fileWriter, Object object, List changes, Database database) throws IOException {
        final Table table = (Table) object;
        writeTableRemarks(fileWriter, table, database);
        writeColumns(fileWriter, table, database);
        writeTableIndexes(fileWriter, table, database);
        writeTableForeignKeys(fileWriter, table, database);
    }

    private void writeColumns(FileWriter fileWriter, Table table, Database database) throws IOException {
        List> cells = new ArrayList>();

        for (Column column : table.getColumns()) {
            String remarks = column.getRemarks();
            cells.add(Arrays.asList(column.getType().toString(),
                    column.isNullable() ? "NULL" : "NOT NULL",
                    "" + column.getName() + "",
                    remarks != null ? remarks : ""));
            //todo: add foreign key info to columns?
        }


        writeTable("Current Columns", cells, fileWriter);
    }
    
    private void writeTableRemarks(FileWriter fileWriter, Table table, Database database) throws IOException {
        final String tableRemarks = table.getRemarks();
        if (tableRemarks != null && tableRemarks.length() > 0) {
        	final List> cells = new ArrayList>();
        	cells.add(Arrays.asList(tableRemarks));
        	writeTable("Table Description", cells, fileWriter);
        }
    }
    
    private void writeTableIndexes(FileWriter fileWriter, Table table, Database database) throws IOException {
        final List> cells = new ArrayList>();
        final PrimaryKey primaryKey = table.getPrimaryKey();
        if (!table.getIndexes().isEmpty()) {
            for (Index index : table.getIndexes()) {
                cells.add(Arrays.asList((primaryKey != null && primaryKey.getBackingIndex() == index ? "Primary Key " : index.isUnique() ? "Unique " : "Non-Unique ") +
                        (index.getClustered() == null ? "" : (index.getClustered() ? "Clustered" : "Non-Clustered")),
                        index.getName(),
                        index.getColumnNames().replace(index.getTable().getName() + ".","")));
            }
        writeTable("Current Table Indexes", cells, fileWriter);
        }
    }
    
    private void writeTableForeignKeys(FileWriter fileWriter, Table table, Database database) throws IOException {
        final List> cells = new ArrayList>();
        if(!table.getOutgoingForeignKeys().isEmpty())
        {
            for (ForeignKey outgoingForeignKey : table.getOutgoingForeignKeys()) {
                cells.add(Arrays.asList(outgoingForeignKey.getName(),
                        outgoingForeignKey.getForeignKeyColumns().toString().replace(table.getName() + ".", "").replaceAll("[\\[\\]]", ""),
                        outgoingForeignKey.getPrimaryKeyTable().toString(),
                        outgoingForeignKey.getPrimaryKeyColumns().toString().replace(outgoingForeignKey.getPrimaryKeyTable().toString() + ".", "").replaceAll("[\\[\\]]", "")));
            }
            writeTable("Current Table Foreign Keys", cells, fileWriter);
        }
    }
}