DrainRate

//==============================================================================
// ** Special Parameter: Drain Rate
// by: Jeneeus Guruman
//------------------------------------------------------------------------------

var Jene = Jene || {};

/*:
 * @plugindesc Special Parameter: Drain Rate v1.1.0
 * @author Jeneeus Guruman
 *
 * @help
 *
 *     This plugin allows to include a paramter that will PASSIVELY drains
 *   a percentage of damage based on the damage dealt to the target as long
 *   as the one that has a drain rate parameter.
 *
 *       <dhr: percent>
 *
 *       percent: The percentage of amount of HP to be drained based on
 *     the damage. The default is 0. Multiple tags will add all values
 *     by percentage (e.g. 200% + -50% = 150%). Note: no percent sign
 *     should be added (e.g. <dhr: 50>).
 *
 *       <dmr: percent>
 *
 *       percent: The percentage of amount of MP to be drained based on
 *     the damage. The default is 0. Multiple tags will add all values
 *     by percentage (e.g. 200% + -50% = 150%). Note: no percent sign
 *     should be added (e.g. <dmr: 50>).
 *
 *       <dsr: percent>
 *
 *       percent: The percentage of amount of either HP or MP to be drained
 *     on the skills and items assigned. The default is 100. Note: no
 *     percent sign should be added (e.g. <dsr: 50>).
 *
 *       <dhr_exclude>
 *       <dmr_exclude>
 *
 *       Skills and items assigned to this will not drain any damage.
 *
 *       <dsr_switch>
 *
 *       Skills and items assigned to this will switch the restored value
 *     in draining skills and items (e.g. HP Drain damage will restore
 *     MP instead).
 *
 *       Notes:
 *       * This will only affect the damage formula and not the effects.
 *       * This can be placed with negative values and thus can be used as
 *       a recoil state instead.
 *       * "dhr" and "dsr" will only work on "HP Damage" damage type skills
 *       and items.
 *       * "dsr" will only work on "HP Drain" and "MP Drain" damage type
 *       skills.
 *
 *   Changelog:
 *
 *     * v1.1.0: Added "dsr" to manipulate the absorb percentage of skills
 *     and items and "dsr_switch" to swap the portion to be restored.
 */

Object.defineProperty(Game_BattlerBase.prototype, 'dhr', {
    get: function() {
        var value = 0;
        this.traitObjects().forEach(function(trait) {
            var dhr = parseFloat(trait.meta.dhr) || 0;
            value += dhr;
        });
        return value / 100;
    },
    configurable: true
});

Object.defineProperty(Game_BattlerBase.prototype, 'dmr', {
    get: function() {
        var value = 0;
        this.traitObjects().forEach(function(trait) {
            var dmr = parseFloat(trait.meta.dmr) || 0;
            value += dmr;
        });
        return value / 100;
    },
    configurable: true
});

Jene.gameActionExecuteDamage = Game_Action.prototype.executeDamage;

Game_Action.prototype.executeDamage = function(target, value) {
    Jene.gameActionExecuteDamage.call(this, target, value);
    if (this.isHpEffect() && value > 0) {
        if (this.subject().dhr != 0 && !this.item().meta.dhr_exclude) {
            this.subject().gainHp(Math.round(value * this.subject().dhr));
        }
        if (this.subject().dmr != 0 && !this.item().meta.dmr_exclude) {
            this.subject().gainMp(Math.round(value * this.subject().dmr));
        }
    }
};

Jene.gameActionGainedDrainedHp = Game_Action.prototype.gainDrainedHp;

Game_Action.prototype.gainDrainedHp = function(value) {
    var item = this.item();
    if (!item.meta.dsr) {
        Jene.gameActionGainedDrainedHp.call(this, value);
    }
    else {
        console.log(item.meta.dsr);
        if (item.meta.dsr_switch) {
            this.subject().gainMp(Math.ceil(value * Number(item.meta.dsr) / 100));
        }
        else {
            this.subject().gainHp(Math.ceil(value * Number(item.meta.dsr) / 100));
        }
    }
};

Jene.gameActionGainedDrainedMp = Game_Action.prototype.gainDrainedMp;

Game_Action.prototype.gainDrainedMp = function(value) {
    var item = this.item();
    if (!item.meta.dsr) {
        Jene.gameActionGainedDrainedMp.call(this, value);
    }
    else {
        if (item.meta.dsr_switch) {
            this.subject().gainHp(Math.ceil(value * Number(item.meta.dsr) / 100));
        }
        else {
            this.subject().gainMp(Math.ceil(value * Number(item.meta.dsr) / 100));
        }
    }
};