# ===============================================================================
# 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 logging

from sqlalchemy.orm import validates, reconstructor

import eos.db
from eos.effectHandlerHelpers import HandledItem, HandledCharge
from eos.modifiedAttributeDict import ModifiedAttributeDict, ItemAttrShortcut, ChargeAttrShortcut
from eos.types import FighterAbility, Slot

logger = logging.getLogger(__name__)


class Fighter(HandledItem, HandledCharge, ItemAttrShortcut, ChargeAttrShortcut):
    DAMAGE_TYPES = ("em", "kinetic", "explosive", "thermal")
    DAMAGE_TYPES2 = ("EM", "Kin", "Exp", "Therm")

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

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

        self.itemID = item.ID if item is not None else None
        self.projected = False
        self.active = True

        # -1 is a placeholder that represents max squadron size, which we may not know yet as ships may modify this with
        # their effects. If user changes this, it is then overridden with user value.
        self.amount = -1

        self.__abilities = self.__getAbilities()

        self.build()

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

        if self.itemID:
            self.__item = eos.db.getItem(self.itemID)
            if self.__item is None:
                logger.error("Item (id: %d) does not exist", self.itemID)
                return

        if self.isInvalid:
            logger.error("Item (id: %d) is not a Fighter", self.itemID)
            return

        self.build()

    def build(self):
        """ Build object. Assumes proper and valid item already set """
        self.__charge = None
        self.__dps = None
        self.__volley = None
        self.__miningyield = None
        self.__itemModifiedAttributes = ModifiedAttributeDict()
        self.__chargeModifiedAttributes = ModifiedAttributeDict()

        if len(self.abilities) != len(self.item.effects):
            self.__abilities = []
            for ability in self.__getAbilities():
                self.__abilities.append(ability)

        if self.__item:
            self.__itemModifiedAttributes.original = self.__item.attributes
            self.__itemModifiedAttributes.overrides = self.__item.overrides
            self.__slot = self.__calculateSlot(self.__item)

            chargeID = self.getModifiedItemAttr("fighterAbilityLaunchBombType")
            if chargeID is not None:
                charge = eos.db.getItem(int(chargeID))
                self.__charge = charge
                self.__chargeModifiedAttributes.original = charge.attributes
                self.__chargeModifiedAttributes.overrides = charge.overrides

    def __getAbilities(self):
        """Returns list of FighterAbilities that are loaded with data"""
        return [FighterAbility(effect) for effect in self.item.effects.values()]

    def __calculateSlot(self, item):
        types = {"Light": Slot.F_LIGHT,
                 "Support": Slot.F_SUPPORT,
                 "Heavy": Slot.F_HEAVY}

        for t, slot in types.iteritems():
            if self.getModifiedItemAttr("fighterSquadronIs{}".format(t)):
                return slot

    @property
    def slot(self):
        return self.__slot

    @property
    def amountActive(self):
        return int(self.getModifiedItemAttr("fighterSquadronMaxSize")) if self.amount == -1 else self.amount

    @amountActive.setter
    def amountActive(self, i):
        self.amount = int(max(min(i, self.getModifiedItemAttr("fighterSquadronMaxSize")), 0))

    @property
    def fighterSquadronMaxSize(self):
        return int(self.getModifiedItemAttr("fighterSquadronMaxSize"))

    @property
    def abilities(self):
        return self.__abilities or []

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

    @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 != "Fighter"

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

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

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

    @property
    def dps(self):
        return self.damageStats()

    def damageStats(self, targetResists=None):
        if self.__dps is None:
            self.__volley = 0
            self.__dps = 0
            if self.active and self.amountActive > 0:
                for ability in self.abilities:
                    dps, volley = ability.damageStats(targetResists)
                    self.__dps += dps
                    self.__volley += volley

                # For forward compatability this assumes a fighter
                # can have more than 2 damaging abilities and/or
                # multiple that use charges.
                if self.owner.factorReload:
                    activeTimes = []
                    reloadTimes = []
                    constantDps = 0
                    for ability in self.abilities:
                        if not ability.active:
                            continue
                        if ability.numShots == 0:
                            dps, volley = ability.damageStats(targetResists)
                            constantDps += dps
                            continue
                        activeTimes.append(ability.numShots * ability.cycleTime)
                        reloadTimes.append(ability.reloadTime)

                    if len(activeTimes) > 0:
                        shortestActive = sorted(activeTimes)[0]
                        longestReload = sorted(reloadTimes, reverse=True)[0]
                        self.__dps = max(constantDps, self.__dps * shortestActive / (shortestActive + longestReload))

        return self.__dps, self.__volley

    @property
    def maxRange(self):
        attrs = ("shieldTransferRange", "powerTransferRange",
                 "energyDestabilizationRange", "empFieldRange",
                 "ecmBurstRange", "maxRange")
        for attr in attrs:
            maxRange = self.getModifiedItemAttr(attr)
            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)
            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 >= -1,
               }

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

    def clear(self):
        self.__dps = None
        self.__volley = None
        self.__miningyield = None
        self.itemModifiedAttributes.clear()
        self.chargeModifiedAttributes.clear()
        [x.clear() for x in self.abilities]

    def canBeApplied(self, projectedOnto):
        """Check if fighter 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 not self.active:
            return

        if self.projected or forceProjected:
            context = "projected", "fighter"
            projected = True
        else:
            context = ("fighter",)
            projected = False

        for ability in self.abilities:
            if ability.active:
                effect = ability.effect
                if effect.runTime == runTime and effect.activeByDefault and \
                        ((projected and effect.isType("projected")) or not projected):
                    if ability.grouped:
                        effect.handler(fit, self, context)
                    else:
                        i = 0
                        while i != self.amountActive:
                            effect.handler(fit, self, context)
                            i += 1

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

    def fits(self, fit):
        # If ships doesn't support this type of fighter, don't add it
        if fit.getNumSlots(self.slot) == 0:
            return False

        return True