# ===============================================================================
# Copyright (C) 2010 Diego Duclos
#
# This file is part of eos.
#
# eos is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# eos is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with eos.  If not, see <http://www.gnu.org/licenses/>.
# ===============================================================================

import math
from logbook import Logger
from sqlalchemy.orm import reconstructor, validates

import eos.db
from eos.effectHandlerHelpers import HandledCharge, HandledItem
from eos.modifiedAttributeDict import ChargeAttrShortcut, ItemAttrShortcut, ModifiedAttributeDict
from eos.utils.cycles import CycleInfo
from eos.utils.stats import DmgTypes


pyfalog = Logger(__name__)


class Drone(HandledItem, HandledCharge, ItemAttrShortcut, ChargeAttrShortcut):
    MINING_ATTRIBUTES = ("miningAmount",)

    def __init__(self, item):
        """Initialize a drone from the program"""
        self.__item = item

        if self.isInvalid:
            raise ValueError("Passed item is not a Drone")

        self.itemID = item.ID if item is not None else None
        self.amount = 0
        self.amountActive = 0
        self.projected = False
        self.build()

    @reconstructor
    def init(self):
        """Initialize a drone from the database and validate"""
        self.__item = None

        if self.itemID:
            self.__item = eos.db.getItem(self.itemID)
            if self.__item is None:
                pyfalog.error("Item (id: {0}) does not exist", self.itemID)
                return

        if self.isInvalid:
            pyfalog.error("Item (id: {0}) is not a Drone", self.itemID)
            return

        self.build()

    def build(self):
        """ Build object. Assumes proper and valid item already set """
        self.__charge = None
        self.__baseVolley = None
        self.__baseRemoteReps = None
        self.__miningyield = None
        self.__itemModifiedAttributes = ModifiedAttributeDict()
        self.__itemModifiedAttributes.original = self.__item.attributes
        self.__itemModifiedAttributes.overrides = self.__item.overrides

        self.__chargeModifiedAttributes = ModifiedAttributeDict()
        # pheonix todo: check the attribute itself, not the modified. this will always return 0 now.
        chargeID = self.getModifiedItemAttr("entityMissileTypeID", None)
        if chargeID is not None:
            charge = eos.db.getItem(int(chargeID))
            self.__charge = charge
            self.__chargeModifiedAttributes.original = charge.attributes
            self.__chargeModifiedAttributes.overrides = charge.overrides

    @property
    def itemModifiedAttributes(self):
        return self.__itemModifiedAttributes

    @property
    def chargeModifiedAttributes(self):
        return self.__chargeModifiedAttributes

    @property
    def isInvalid(self):
        return self.__item is None or self.__item.category.name != "Drone"

    @property
    def item(self):
        return self.__item

    @property
    def charge(self):
        return self.__charge

    @property
    def cycleTime(self):
        if self.hasAmmo:
            cycleTime = self.getModifiedItemAttr("missileLaunchDuration", 0)
        else:
            for attr in ("speed", "duration"):
                cycleTime = self.getModifiedItemAttr(attr, None)
                if cycleTime is not None:
                    break
        if cycleTime is None:
            return 0
        return max(cycleTime, 0)

    @property
    def dealsDamage(self):
        for attr in ("emDamage", "kineticDamage", "explosiveDamage", "thermalDamage"):
            if attr in self.itemModifiedAttributes or attr in self.chargeModifiedAttributes:
                return True

    @property
    def mines(self):
        if "miningAmount" in self.itemModifiedAttributes:
            return True

    @property
    def hasAmmo(self):
        return self.charge is not None

    def isDealingDamage(self):
        volleyParams = self.getVolleyParameters()
        for volley in volleyParams.values():
            if volley.total > 0:
                return True
        return False

    def getVolleyParameters(self, targetResists=None):
        if not self.dealsDamage or self.amountActive <= 0:
            return {0: DmgTypes(0, 0, 0, 0)}
        if self.__baseVolley is None:
            dmgGetter = self.getModifiedChargeAttr if self.hasAmmo else self.getModifiedItemAttr
            dmgMult = self.amountActive * (self.getModifiedItemAttr("damageMultiplier", 1))
            self.__baseVolley = DmgTypes(
                em=(dmgGetter("emDamage", 0)) * dmgMult,
                thermal=(dmgGetter("thermalDamage", 0)) * dmgMult,
                kinetic=(dmgGetter("kineticDamage", 0)) * dmgMult,
                explosive=(dmgGetter("explosiveDamage", 0)) * dmgMult)
        volley = DmgTypes(
            em=self.__baseVolley.em * (1 - getattr(targetResists, "emAmount", 0)),
            thermal=self.__baseVolley.thermal * (1 - getattr(targetResists, "thermalAmount", 0)),
            kinetic=self.__baseVolley.kinetic * (1 - getattr(targetResists, "kineticAmount", 0)),
            explosive=self.__baseVolley.explosive * (1 - getattr(targetResists, "explosiveAmount", 0)))
        return {0: volley}

    def getVolley(self, targetResists=None):
        return self.getVolleyParameters(targetResists=targetResists)[0]

    def getDps(self, targetResists=None):
        volley = self.getVolley(targetResists=targetResists)
        if not volley:
            return DmgTypes(0, 0, 0, 0)
        cycleParams = self.getCycleParameters()
        if cycleParams is None:
            return DmgTypes(0, 0, 0, 0)
        dpsFactor = 1 / (cycleParams.averageTime / 1000)
        dps = DmgTypes(
            em=volley.em * dpsFactor,
            thermal=volley.thermal * dpsFactor,
            kinetic=volley.kinetic * dpsFactor,
            explosive=volley.explosive * dpsFactor)
        return dps

    def getCycleParameters(self, reloadOverride=None):
        cycleTime = self.cycleTime
        if cycleTime == 0:
            return None
        return CycleInfo(self.cycleTime, 0, math.inf)

    def getRemoteReps(self, ignoreState=False):
        if self.amountActive <= 0 and not ignoreState:
            return (None, 0)
        if self.__baseRemoteReps is None:
            rrShield = self.getModifiedItemAttr("shieldBonus", 0)
            rrArmor = self.getModifiedItemAttr("armorDamageAmount", 0)
            rrHull = self.getModifiedItemAttr("structureDamageAmount", 0)
            if rrShield:
                rrType = "Shield"
                rrAmount = rrShield
            elif rrArmor:
                rrType = "Armor"
                rrAmount = rrArmor
            elif rrHull:
                rrType = "Hull"
                rrAmount = rrHull
            else:
                rrType = None
                rrAmount = 0
            if rrAmount:
                droneAmount = self.amount if ignoreState else self.amountActive
                cycleParams = self.getCycleParameters()
                if cycleParams is None:
                    rrType = None
                    rrAmount = 0
                else:
                    rrAmount *= droneAmount / (cycleParams.averageTime / 1000)
            self.__baseRemoteReps = (rrType, rrAmount)
        return self.__baseRemoteReps

    @property
    def miningStats(self):
        if self.__miningyield is None:
            if self.mines is True and self.amountActive > 0:
                getter = self.getModifiedItemAttr
                cycleParams = self.getCycleParameters()
                if cycleParams is None:
                    self.__miningyield = 0
                else:
                    cycleTime = cycleParams.averageTime
                    volley = sum([getter(d) for d in self.MINING_ATTRIBUTES]) * self.amountActive
                    self.__miningyield = volley / (cycleTime / 1000.0)
            else:
                self.__miningyield = 0

        return self.__miningyield

    @property
    def maxRange(self):
        attrs = ("shieldTransferRange", "powerTransferRange",
                 "energyDestabilizationRange", "empFieldRange",
                 "ecmBurstRange", "maxRange")
        for attr in attrs:
            maxRange = self.getModifiedItemAttr(attr, None)
            if maxRange is not None:
                return maxRange
        if self.charge is not None:
            delay = self.getModifiedChargeAttr("explosionDelay")
            speed = self.getModifiedChargeAttr("maxVelocity")
            if delay is not None and speed is not None:
                return delay / 1000.0 * speed

    # Had to add this to match the falloff property in modules.py
    # Fscking ship scanners. If you find any other falloff attributes,
    # Put them in the attrs tuple.
    @property
    def falloff(self):
        attrs = ("falloff", "falloffEffectiveness")
        for attr in attrs:
            falloff = self.getModifiedItemAttr(attr, None)
            if falloff is not None:
                return falloff

    @validates("ID", "itemID", "chargeID", "amount", "amountActive")
    def validator(self, key, val):
        map = {
            "ID"          : lambda _val: isinstance(_val, int),
            "itemID"      : lambda _val: isinstance(_val, int),
            "chargeID"    : lambda _val: isinstance(_val, int),
            "amount"      : lambda _val: isinstance(_val, int) and _val >= 0,
            "amountActive": lambda _val: isinstance(_val, int) and self.amount >= _val >= 0
        }

        if not map[key](val):
            raise ValueError(str(val) + " is not a valid value for " + key)
        else:
            return val

    def clear(self):
        self.__baseVolley = None
        self.__baseRemoteReps = None
        self.__miningyield = None
        self.itemModifiedAttributes.clear()
        self.chargeModifiedAttributes.clear()

    def canBeApplied(self, projectedOnto):
        """Check if drone can engage specific fitting"""
        item = self.item
        # Do not allow to apply offensive modules on ship with offensive module immunite, with few exceptions
        # (all effects which apply instant modification are exception, generally speaking)
        if item.offensive and projectedOnto.ship.getModifiedItemAttr("disallowOffensiveModifiers") == 1:
            offensiveNonModifiers = {"energyDestabilizationNew",
                                     "leech",
                                     "energyNosferatuFalloff",
                                     "energyNeutralizerFalloff"}
            if not offensiveNonModifiers.intersection(set(item.effects)):
                return False
        # If assistive modules are not allowed, do not let to apply these altogether
        if item.assistive and projectedOnto.ship.getModifiedItemAttr("disallowAssistance") == 1:
            return False
        else:
            return True

    def calculateModifiedAttributes(self, fit, runTime, forceProjected=False):
        if self.projected or forceProjected:
            context = "projected", "drone"
            projected = True
        else:
            context = ("drone",)
            projected = False

        for effect in self.item.effects.values():
            if effect.runTime == runTime and \
                    effect.activeByDefault and \
                    ((projected is True and effect.isType("projected")) or
                                 projected is False and effect.isType("passive")):
                # See GH issue #765
                if effect.getattr('grouped'):
                    effect.handler(fit, self, context)
                else:
                    i = 0
                    while i != self.amountActive:
                        effect.handler(fit, self, context)
                        i += 1

        if self.charge:
            for effect in self.charge.effects.values():
                if effect.runTime == runTime and effect.activeByDefault:
                    effect.handler(fit, self, ("droneCharge",))

    def __deepcopy__(self, memo):
        copy = Drone(self.item)
        copy.amount = self.amount
        copy.amountActive = self.amountActive
        return copy

    def rebase(self, item):
        amount = self.amount
        amountActive = self.amountActive
        Drone.__init__(self, item)
        self.amount = amount
        self.amountActive = amountActive

    def fits(self, fit):
        fitDroneGroupLimits = set()
        for i in range(1, 3):
            groneGrp = fit.ship.getModifiedItemAttr("allowedDroneGroup%d" % i, None)
            if groneGrp is not None:
                fitDroneGroupLimits.add(int(groneGrp))
        if len(fitDroneGroupLimits) == 0:
            return True
        if self.item.groupID in fitDroneGroupLimits:
            return True
        return False