/*
 * Copyright (c) 2014-2015 by appPlant UG. All rights reserved.
 *
 * @APPPLANT_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apache License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://opensource.org/licenses/Apache-2.0/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPPLANT_LICENSE_HEADER_END@
 */

package de.appplant.cordova.plugin.notification;

import org.json.JSONObject;

import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import de.appplant.cordova.plugin.notification.trigger.DateTrigger;
import de.appplant.cordova.plugin.notification.trigger.IntervalTrigger;
import de.appplant.cordova.plugin.notification.trigger.MatchTrigger;

import static de.appplant.cordova.plugin.notification.trigger.IntervalTrigger.Unit;

/**
 * An object you use to specify a notification’s content and the condition
 * that triggers its delivery.
 */
public final class Request {

  // Key name for bundled extras
  static final String EXTRA_OCCURRENCE = "NOTIFICATION_OCCURRENCE";

  // Key name for bundled extras
  public static final String EXTRA_LAST = "NOTIFICATION_LAST";

  // The options spec
  private final Options options;

  // The right trigger for the options
  private final DateTrigger trigger;

  // How often the trigger shall occur
  private final int count;

  // The trigger spec
  private final JSONObject spec;

  // The current trigger date
  private Date triggerDate;

  /**
   * Create a request with a base date specified through the passed options.
   *
   * @param options The options spec.
   */
  public Request(Options options) {
    this.options = options;
    this.spec = options.getTrigger();
    this.count = Math.max(spec.optInt("count"), 1);
    this.trigger = buildTrigger();
    this.triggerDate = trigger.getNextTriggerDate(getBaseDate());
  }

  /**
   * Create a request with a base date specified via base argument.
   *
   * @param options The options spec.
   * @param base    The base date from where to calculate the next trigger.
   */
  public Request(Options options, Date base) {
    this.options = options;
    this.spec = options.getTrigger();
    this.count = Math.max(spec.optInt("count"), 1);
    this.trigger = buildTrigger();
    this.triggerDate = trigger.getNextTriggerDate(base);
  }

  /**
   * Gets the options spec.
   */
  public Options getOptions() {
    return options;
  }

  /**
   * The identifier for the request.
   *
   * @return The notification ID as the string
   */
  String getIdentifier() {
    return options.getId().toString() + "-" + getOccurrence();
  }

  /**
   * The value of the internal occurrence counter.
   */
  int getOccurrence() {
    return trigger.getOccurrence();
  }

  /**
   * If there's one more trigger date to calculate.
   */
  private boolean hasNext() {
    return triggerDate != null && getOccurrence() <= count;
  }

  /**
   * Moves the internal occurrence counter by one.
   */
  boolean moveNext() {
    if (hasNext()) {
      triggerDate = getNextTriggerDate();
    } else {
      triggerDate = null;
    }

    return this.triggerDate != null;
  }

  /**
   * Gets the current trigger date.
   *
   * @return null if there's no trigger date.
   */
  public Date getTriggerDate() {
    Calendar now = Calendar.getInstance();

    if (triggerDate == null)
      return null;

    long time = triggerDate.getTime();

    if ((now.getTimeInMillis() - time) > 60000)
      return null;

    if (time >= spec.optLong("before", time + 1))
      return null;

    return triggerDate;
  }

  /**
   * Gets the next trigger date based on the current trigger date.
   */
  private Date getNextTriggerDate() {
    return trigger.getNextTriggerDate(triggerDate);
  }

  /**
   * Build the trigger specified in options.
   */
  private DateTrigger buildTrigger() {
    Object every = spec.opt("every");

    if (every instanceof JSONObject) {
      List<Integer> cmp1 = getMatchingComponents();
      List<Integer> cmp2 = getSpecialMatchingComponents();

      return new MatchTrigger(cmp1, cmp2);
    }

    Unit unit = getUnit();
    int ticks = getTicks();

    return new IntervalTrigger(ticks, unit);
  }

  /**
   * Gets the unit value.
   */
  private Unit getUnit() {
    Object every = spec.opt("every");
    String unit = "SECOND";

    if (spec.has("unit")) {
      unit = spec.optString("unit", "second");
    } else if (every instanceof String) {
      unit = spec.optString("every", "second");
    }

    return Unit.valueOf(unit.toUpperCase());
  }

  /**
   * Gets the tick value.
   */
  private int getTicks() {
    Object every = spec.opt("every");
    int ticks = 0;

    if (spec.has("at")) {
      ticks = 0;
    } else if (spec.has("in")) {
      ticks = spec.optInt("in", 0);
    } else if (every instanceof String) {
      ticks = 1;
    } else if (!(every instanceof JSONObject)) {
      ticks = spec.optInt("every", 0);
    }

    return ticks;
  }

  /**
   * Gets an array of all date parts to construct a datetime instance.
   *
   * @return [min, hour, day, month, year]
   */
  private List<Integer> getMatchingComponents() {
    JSONObject every = spec.optJSONObject("every");

    return Arrays.asList(
        (Integer) every.opt("minute"),
        (Integer) every.opt("hour"),
        (Integer) every.opt("day"),
        (Integer) every.opt("month"),
        (Integer) every.opt("year"));
  }

  /**
   * Gets an array of all date parts to construct a datetime instance.
   *
   * @return [min, hour, day, month, year]
   */
  private List<Integer> getSpecialMatchingComponents() {
    JSONObject every = spec.optJSONObject("every");

    return Arrays.asList(
        (Integer) every.opt("weekday"),
        (Integer) every.opt("weekdayOrdinal"),
        (Integer) every.opt("weekOfMonth"),
        (Integer) every.opt("quarter"));
  }

  /**
   * Gets the base date from where to calculate the next trigger date.
   */
  private Date getBaseDate() {
    if (spec.has("at")) {
      return new Date(spec.optLong("at", 0));
    } else if (spec.has("firstAt")) {
      return new Date(spec.optLong("firstAt", 0));
    } else if (spec.has("after")) {
      return new Date(spec.optLong("after", 0));
    } else {
      return new Date();
    }
  }

}