package de.hftstuttgart.unifiedticketing.core;

import de.hftstuttgart.unifiedticketing.exceptions.AssertionException;
import de.hftstuttgart.unifiedticketing.systems.github.GithubTicketSystem;
import de.hftstuttgart.unifiedticketing.systems.gitlab.GitlabTicketSystem;

import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Defines the representation of a ticket system connection<br/>
 * <br/>
 *
 * @param <T> ticket implementation this ticket system uses
 * @param <TS> implementation of this class an instance belongs to
 * @param <TB> ticket builder this ticket system uses
 * @param <F> filter implementation this ticket system uses
 */
public abstract class TicketSystem<T extends Ticket, TS extends TicketSystem, TB extends TicketBuilder, F extends Filter>
{
    private static Logger logger = Logging.getLogger(TicketSystem.class.getName());

    /**
     * Global configuration options for ticket system instances, settable with the method config
     */
    public enum ConfigurationOptions
    {
        RETURN_NULL_ON_ERROR
    }

    protected TicketSystem() { }

    /**
     * creates a ticketsystem from an uri<br/>
     * <br/>
     * a valid uri for this library always starts with "unifiedticketing" followed by a colon.
     * Next is the identifier for the desired ticket system.
     * The available systems and what identifier they need, can be found in the documentation.
     * <br/>
     * example: {@code "unifiedticketing:<systemidentifier>:<system specific things>"}
     *
     * @return ticket system instance
     */
    public static TicketSystem fromUri(String uri)
    {
        Pattern pattern = Pattern.compile("^(unifiedticketing):([a-zA-Z0-9_]+):(.*)$");
        Matcher matcher = pattern.matcher(uri);

        if (!matcher.matches())
        {
            logger.log(Level.SEVERE, "given URI not for unifiedticketing!");
            throw new AssertionException(String.format("URI %s not for unifiedticketing", uri));
        }

        switch (matcher.group(2))
        {
            case "github":
                return GithubTicketSystem.fromUri(matcher.group(3));

            case "gitlab":
                return GitlabTicketSystem.fromUri(matcher.group(3));

            default:
                logger.log(Level.SEVERE, String.format(
                    "Unknown system identifier: %s",
                    matcher.group(2)
                ));
                throw new AssertionException(String.format(
                    "no supported system implementation found for %s",
                    matcher.group(2)
                ));

        }

    }

    /**
     * @return builder selection
     */
    public static RegisteredSystems fromBuilder()
    {
        return RegisteredSystems.getInstance();
    }

    // Instance definition =====================================================================//

    public String apiKey;
    public String baseUrl;
    public String password;
    public String username;

    protected Map<String, String> configuration = new HashMap<>();

    /**
     * sets a value configuration
     * @param option configuration to set
     * @param value value to be stored
     * @return this ticket system
     */
    public TS config(ConfigurationOptions option, String value)
    {
        this.configuration.put(option.name(), value);
        return (TS) this;
    }

    /**
     * enables/disables a configuration
     * @param option configuration to set
     * @param value true to enable the setting
     * @return this ticket system
     */
    public TS config(ConfigurationOptions option, boolean value)
    {
        return config(option, String.valueOf(value));
    }

    /**
     * @param option configuration to check
     * @return true if configuration has stored "true"
     */
    public boolean getConfigTrue(ConfigurationOptions option)
    {
        return Boolean.parseBoolean(this.configuration.get(option.name()));
    }

    /**
     * @param option configuration to get stored value
     * @return stored value of given config
     */
    public Object getConfigValue(ConfigurationOptions option)
    {
        return this.configuration.get(option.name());
    }

    /**
     * starts ticket builder for this ticket system
     */
    public abstract TB createTicket();

    /**
     * starts ticket filter for this ticket system
     */
    public abstract F find();

//    public abstract List<T> getAllTickets();

    /**
     * requests a single ticket by it's id
     */
    public abstract T getTicketById(String id);

    public T getTicketById(int id)
    {
        logger.log(Level.FINEST, "transforming id to String");
        return this.getTicketById(String.valueOf(id));
    }

    public abstract boolean hasAssigneeSupport();
    public abstract boolean hasDefaultPagination();
    public abstract boolean hasLabelSupport();
    public abstract boolean hasPaginationSupport();
    public abstract boolean hasReturnNullOnErrorSupport();
//    public static boolean hasUriBuildSupport();
}