package org.gcube.informationsystem.utils.documentation;

import java.io.File;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.gcube.informationsystem.types.reference.Type;
import org.gcube.informationsystem.types.reference.properties.PropertyDefinition;
import org.gcube.informationsystem.utils.discovery.Discovery;
import org.gcube.informationsystem.utils.documentation.rst.Section;
import org.gcube.informationsystem.utils.documentation.rst.Section.SectionType;
import org.gcube.informationsystem.utils.documentation.rst.table.Cell;
import org.gcube.informationsystem.utils.documentation.rst.table.Row;
import org.gcube.informationsystem.utils.documentation.rst.table.RowType;
import org.gcube.informationsystem.utils.documentation.rst.table.Table;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
public class DocumentationGenerator {

	private static final Logger logger = LoggerFactory.getLogger(DocumentationGenerator.class);
	
	protected File baseDirectory;

	public DocumentationGenerator(File baseDirectory) {
		this.baseDirectory = baseDirectory;
	}
	
	/*
	 * E.g. GCubeProperty extends Property
	 */
	protected StringBuffer getTypeDeclaration(Type type) {
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append("**");
		stringBuffer.append(type.getName());
		stringBuffer.append("**");
		stringBuffer.append(" ``extends`` ");
		boolean first = true;
		for(String superClass : type.getSuperClasses()) {
			if(!first) {
				stringBuffer.append(", ");
			}else {
				first = false;
			}
			stringBuffer.append("**");
			stringBuffer.append(superClass);
			stringBuffer.append("**");
		}
		return stringBuffer;
	}
	
	protected StringBuffer getTypeChangelog(Type type) {
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append("The **");
		stringBuffer.append(type.getName());
		stringBuffer.append("** current version is ");
		stringBuffer.append(type.getVersionAsString());
		stringBuffer.append(".\n\n");
		Map<String, String> changelog = type.getChangelogWithVersionAsString();
		Set<String> keySet = changelog.keySet();
		stringBuffer.append("Changelog:\n\n");
		int i=0;
		for(String version : keySet) {
			stringBuffer.append("* **");
			stringBuffer.append(version);
			stringBuffer.append("**: ");
			stringBuffer.append(changelog.get(version));
			if(i==keySet.size()-1) {
				stringBuffer.append(".");
			}else {
				stringBuffer.append(";");
			}
		}
		stringBuffer.append("\n\n");
		return stringBuffer;
	}
	
	protected Row getPropertyHeadingRow() {
		Row row = new Row(RowType.HEADING);
		Cell name = new Cell();
		name.setText("Name");
		row.appendCell(name);
		Cell type = new Cell();
		type.setText("Type");
		row.appendCell(type);
		Cell attributes = new Cell();
		attributes.setText("Attributes");
		row.appendCell(attributes);
		Cell description = new Cell();
		description.setText("Description");
		row.appendCell(description);
		return row;
	}
	
	protected String getPropertyAttributes(PropertyDefinition propertyDefinition) {
		StringBuffer stringBuffer = new StringBuffer();
		
		boolean mandatory = propertyDefinition.isMandatory();
		stringBuffer.append("``Mandatory:");
		stringBuffer.append(mandatory);
		
		boolean readOnly = propertyDefinition.isReadonly();
		stringBuffer.append("`` ``ReadOnly:");
		stringBuffer.append(readOnly);
		
		boolean notNull = propertyDefinition.isNotnull();
		stringBuffer.append("`` ``NotNull:");
		stringBuffer.append(notNull);
		
		String regex = propertyDefinition.getRegexp();
		if(regex!=null && regex.compareTo("")!=0) {
			stringBuffer.append("`` ``Regex:");
			stringBuffer.append(regex);
		}
		
		Integer max = propertyDefinition.getMax();
		if(max!=null) {
			stringBuffer.append("`` ``Max:");
			stringBuffer.append(max);
		}
		
		Integer min = propertyDefinition.getMin();
		if(min!=null) {
			stringBuffer.append("`` ``Min:");
			stringBuffer.append(min);
		}
		stringBuffer.append("``");
		return stringBuffer.toString();
	}
	
	protected Row getPropertyRow(PropertyDefinition propertyDefinition) {
		Row row = new Row(RowType.NORMAL);
		Cell name = new Cell();
		name.setText(propertyDefinition.getName());
		row.appendCell(name);
		Cell type = new Cell();
		type.setText(propertyDefinition.getType());
		row.appendCell(type);
		Cell attributes = new Cell();
		attributes.setText(getPropertyAttributes(propertyDefinition));
		row.appendCell(attributes);
		Cell description = new Cell();
		description.setText(propertyDefinition.getDescription());
		row.appendCell(description);
		return row;
	}
	
	protected Table getTable(Type type) {
		
		Table table = new Table();
		table.appendRow(getPropertyHeadingRow());
		Set<PropertyDefinition> properties = type.getProperties();
		if(properties!=null && properties.size()>0) {
			Set<PropertyDefinition> notManadatoryProperties = new HashSet<>();
			for(PropertyDefinition propertyDefinition : properties) {
				if(propertyDefinition.isMandatory()) {
					/*
					 * Adding Mandatory properties first in the table
					 */
					table.appendRow(getPropertyRow(propertyDefinition));
				}else {
					notManadatoryProperties.add(propertyDefinition);
				}
			}
			for(PropertyDefinition propertyDefinition : notManadatoryProperties) {
				table.appendRow(getPropertyRow(propertyDefinition));
			}
		}else {
			table.appendRow(getNoPropertyRow());
		}
		return table;
	}
	
	protected Row getNoPropertyRow() {
		Row row = new Row(RowType.NORMAL);
		Cell noProp = new Cell();
		noProp.setText("This type does not define any additional attributes.");
		row.appendCell(noProp);
		row.appendCell(noProp);
		row.appendCell(noProp);
		row.appendCell(noProp);
		return row;
	}

	public StringBuffer generatePropertySection(Type type) {
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append("\n");
		String name = type.getName();
		Section section = new Section();
		stringBuffer.append(section.generateSection(SectionType.HEADING_3, name));
		stringBuffer.append(type.getDescription());
		stringBuffer.append("\n");
		
		String tableTitle = getTypeDeclaration(type).toString();
		Table table = getTable(type);
		stringBuffer.append(table.generateTable(tableTitle));
		
		stringBuffer.append(getTypeChangelog(type));
		
		logger.info(stringBuffer.toString());
		return stringBuffer;
	}
	
	public StringBuffer generateResourceSection(Type type) {
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append("\n");
		String name = type.getName();
		Section section = new Section();
		stringBuffer.append(section.generateSection(SectionType.HEADING_3, name));
		stringBuffer.append(type.getDescription());
		stringBuffer.append("\n");
		
		String tableTitle = getTypeDeclaration(type).toString();
		Table table = getTable(type);
		stringBuffer.append(table.generateTable(tableTitle));
		
		stringBuffer.append(getTypeChangelog(type));
		
		logger.info(stringBuffer.toString());
		return stringBuffer;
	}
	
	public StringBuffer generateFacetSection(Type type) {
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append("\n");
		String name = type.getName();
		Section section = new Section();
		stringBuffer.append(section.generateSection(SectionType.HEADING_3, name));
		stringBuffer.append(type.getDescription());
		stringBuffer.append("\n");
		
		String tableTitle = getTypeDeclaration(type).toString();
		Table table = getTable(type);
		stringBuffer.append(table.generateTable(tableTitle));
		
		stringBuffer.append(getTypeChangelog(type));
		
		logger.info(stringBuffer.toString());
		return stringBuffer;
	}
	
	public StringBuffer generateISRelatedToSection(Type type) {
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append("\n");
		String name = type.getName();
		Section section = new Section();
		stringBuffer.append(section.generateSection(SectionType.HEADING_3, name));
		stringBuffer.append(type.getDescription());
		stringBuffer.append("\n");
		
		String tableTitle = getTypeDeclaration(type).toString();
		Table table = getTable(type);
		stringBuffer.append(table.generateTable(tableTitle));
		
		stringBuffer.append(getTypeChangelog(type));
		
		logger.info(stringBuffer.toString());
		return stringBuffer;
	}
	
	public StringBuffer generateConsistsOfSection(Type type) {
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append("\n");
		String name = type.getName();
		Section section = new Section();
		stringBuffer.append(section.generateSection(SectionType.HEADING_3, name));
		stringBuffer.append(type.getDescription());
		stringBuffer.append("\n");
		
		String tableTitle = getTypeDeclaration(type).toString();
		Table table = getTable(type);
		stringBuffer.append(table.generateTable(tableTitle));
		
		stringBuffer.append(getTypeChangelog(type));
		
		logger.info(stringBuffer.toString());
		return stringBuffer;
	}
	
	public void generate(List<Package> pkgs) throws Exception {
		
		DocumentationSchemaAction schemaAction = new DocumentationSchemaAction(pkgs);
		Discovery.discover(schemaAction);
		
		Map<String, Type> propertyElements = schemaAction.getPropertyElement();
		Set<String> propertyNames = propertyElements.keySet();
		for(String name : propertyNames) {
			Type type = propertyElements.get(name);
			generatePropertySection(type);
		}
		
		/*
		Map<String, Type> relationElements = schemaAction.getRelationElements();
		Set<String> relationNames = relationElements.keySet();
		for(String name : relationNames) {
			Type type = propertyElements.get(name);
			
		}
		
		Map<String, Type> entityElements = schemaAction.getEntityElement();
		Set<String> entityNames = entityElements.keySet();
		for(String name : entityNames) {
			Type type = propertyElements.get(name);
			
		}
		*/
	}
}