# =============================================================================
# Copyright (C) 2014 Ryan Holmes
#
# This file is part of pyfa.
#
# pyfa is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# pyfa 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with pyfa.  If not, see <http://www.gnu.org/licenses/>.
# =============================================================================

import re
import xml.dom
import xml.parsers.expat

from logbook import Logger

from eos.const import FittingModuleState, FittingSlot
from eos.db import getDynamicItem
from eos.saveddata.cargo import Cargo
from eos.saveddata.citadel import Citadel
from eos.saveddata.drone import Drone
from eos.saveddata.fighter import Fighter
from eos.saveddata.fit import Fit
from eos.saveddata.module import Module
from eos.saveddata.ship import Ship
from gui.fitCommands.helpers import activeStateLimit
from service.fit import Fit as svcFit
from service.market import Market
from service.port.muta import renderMutantAttrs, parseMutantAttrs
from service.port.shared import fetchItem
from utils.strfunctions import replace_ltgt, sequential_rep


pyfalog = Logger(__name__)

# -- 170327 Ignored description --
RE_LTGT = "&(lt|gt);"
L_MARK = "&lt;localized hint=&quot;"
# &lt;localized hint=&quot;([^"]+)&quot;&gt;([^\*]+)\*&lt;\/localized&gt;
LOCALIZED_PATTERN = re.compile(r'<localized hint="([^"]+)">([^\*]+)\*</localized>')


class ExtractingError(Exception):
    pass


def _extract_match(t):
    m = LOCALIZED_PATTERN.match(t)
    if m is None:
        raise ExtractingError
    # hint attribute, text content
    return m.group(1), m.group(2)


def _resolve_ship(fitting, sMkt, b_localized):
    # type: (xml.dom.minidom.Element, service.market.Market, bool) -> eos.saveddata.fit.Fit
    """ NOTE: Since it is meaningless unless a correct ship object can be constructed,
        process flow changed
    """
    # ------ Confirm ship
    # <localized hint="Maelstrom">Maelstrom</localized>
    shipType = fitting.getElementsByTagName("shipType").item(0).getAttribute("value")
    anything = None
    if b_localized:
        try:
            # expect an official name, emergency cache
            shipType, anything = _extract_match(shipType)
        except ExtractingError:
            pass

    limit = 2
    ship = None
    while True:
        must_retry = False
        try:
            try:
                ship = Ship(sMkt.getItem(shipType))
            except ValueError:
                ship = Citadel(sMkt.getItem(shipType))
        except (KeyboardInterrupt, SystemExit):
            raise
        except Exception as e:
            pyfalog.warning("Caught exception on _resolve_ship")
            pyfalog.error(e)
            limit -= 1
            if limit == 0:
                break
            shipType = anything
            must_retry = True
        if not must_retry:
            break

    if ship is None:
        raise Exception("cannot resolve ship type.")

    fitobj = Fit(ship=ship)
    # ------ Confirm fit name
    anything = fitting.getAttribute("name")
    # 2017/03/29 NOTE:
    #    if fit name contained "<" or ">" then reprace to named html entity by EVE client
    # if re.search(RE_LTGT, anything):
    if "&lt;" in anything or "&gt;" in anything:
        anything = replace_ltgt(anything)
    fitobj.name = anything

    return fitobj


def _resolve_module(hardware, sMkt, b_localized):
    # type: (xml.dom.minidom.Element, service.market.Market, bool) -> eos.saveddata.module.Module
    moduleName = hardware.getAttribute("base_type") or hardware.getAttribute("type")
    emergency = None
    if b_localized:
        try:
            # expect an official name, emergency cache
            moduleName, emergency = _extract_match(moduleName)
        except ExtractingError:
            pass

    item = None
    limit = 2
    while True:
        must_retry = False
        try:
            item = sMkt.getItem(moduleName, eager="group.category")
        except (KeyboardInterrupt, SystemExit):
            raise
        except Exception as e:
            pyfalog.warning("Caught exception on _resolve_module")
            pyfalog.error(e)
            limit -= 1
            if limit == 0:
                break
            moduleName = emergency
            must_retry = True
        if not must_retry:
            break

    mutaplasmidName = hardware.getAttribute("mutaplasmid")
    mutaplasmidItem = fetchItem(mutaplasmidName) if mutaplasmidName else None

    mutatedAttrsText = hardware.getAttribute("mutated_attrs")
    mutatedAttrs = parseMutantAttrs(mutatedAttrsText) if mutatedAttrsText else None

    return item, mutaplasmidItem, mutatedAttrs


def importXml(text, progress):
    from .port import Port
    sMkt = Market.getInstance()
    doc = xml.dom.minidom.parseString(text)
    # NOTE:
    #   When L_MARK is included at this point,
    #   Decided to be localized data
    b_localized = L_MARK in text
    fittings = doc.getElementsByTagName("fittings").item(0)
    fittings = fittings.getElementsByTagName("fitting")
    fit_list = []
    failed = 0

    for fitting in fittings:
        if progress and progress.userCancelled:
            return []

        try:
            fitobj = _resolve_ship(fitting, sMkt, b_localized)
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            failed += 1
            continue

        # -- 170327 Ignored description --
        # read description from exported xml. (EVE client, EFT)
        description = fitting.getElementsByTagName("description").item(0).getAttribute("value")
        if description is None:
            description = ""
        elif len(description):
            # convert <br> to "\n" and remove html tags.
            if Port.is_tag_replace():
                description = replace_ltgt(
                    sequential_rep(description, r"<(br|BR)>", "\n", r"<[^<>]+>", "")
                )
        fitobj.notes = description

        hardwares = fitting.getElementsByTagName("hardware")
        moduleList = []
        for hardware in hardwares:
            try:
                item, mutaItem, mutaAttrs = _resolve_module(hardware, sMkt, b_localized)
                if not item or not item.published:
                    continue

                if item.category.name == "Drone":
                    d = None
                    if mutaItem:
                        mutaplasmid = getDynamicItem(mutaItem.ID)
                        if mutaplasmid:
                            try:
                                d = Drone(mutaplasmid.resultingItem, item, mutaplasmid)
                            except ValueError:
                                pass
                            else:
                                for attrID, mutator in d.mutators.items():
                                    if attrID in mutaAttrs:
                                        mutator.value = mutaAttrs[attrID]
                    if d is None:
                        d = Drone(item)
                    d.amount = int(hardware.getAttribute("qty"))
                    fitobj.drones.append(d)
                elif item.category.name == "Fighter":
                    ft = Fighter(item)
                    ft.amount = int(hardware.getAttribute("qty")) if ft.amount <= ft.fighterSquadronMaxSize else ft.fighterSquadronMaxSize
                    fitobj.fighters.append(ft)
                elif hardware.getAttribute("slot").lower() == "cargo":
                    # although the eve client only support charges in cargo, third-party programs
                    # may support items or "refits" in cargo. Support these by blindly adding all
                    # cargo, not just charges
                    c = Cargo(item)
                    c.amount = int(hardware.getAttribute("qty"))
                    fitobj.cargo.append(c)
                else:
                    m = None
                    try:
                        if mutaItem:
                            mutaplasmid = getDynamicItem(mutaItem.ID)
                            if mutaplasmid:
                                try:
                                    m = Module(mutaplasmid.resultingItem, item, mutaplasmid)
                                except ValueError:
                                    pass
                                else:
                                    for attrID, mutator in m.mutators.items():
                                        if attrID in mutaAttrs:
                                            mutator.value = mutaAttrs[attrID]
                        if m is None:
                            m = Module(item)
                    # When item can't be added to any slot (unknown item or just charge), ignore it
                    except ValueError:
                        pyfalog.warning("item can't be added to any slot (unknown item or just charge), ignore it")
                        continue
                    # Add subsystems before modules to make sure T3 cruisers have subsystems installed
                    if item.category.name == "Subsystem":
                        if m.fits(fitobj):
                            m.owner = fitobj
                            fitobj.modules.append(m)
                    else:
                        if m.isValidState(FittingModuleState.ACTIVE):
                            m.state = activeStateLimit(m.item)

                        moduleList.append(m)

            except KeyboardInterrupt:
                pyfalog.warning("Keyboard Interrupt")
                continue

        # Recalc to get slot numbers correct for T3 cruisers
        sFit = svcFit.getInstance()
        sFit.recalc(fitobj)
        sFit.fill(fitobj)

        for module in moduleList:
            if module.fits(fitobj):
                module.owner = fitobj
                fitobj.modules.append(module)

        fit_list.append(fitobj)
        if progress:
            progress.message = "Processing %s\n%s" % (fitobj.ship.name, fitobj.name)

    return fit_list


def exportXml(fits, progress, callback):
    doc = xml.dom.minidom.Document()
    fittings = doc.createElement("fittings")
    # fit count
    fit_count = len(fits)
    fittings.setAttribute("count", "%s" % fit_count)
    doc.appendChild(fittings)

    def addMutantAttributes(node, mutant):
        node.setAttribute("base_type", mutant.baseItem.name)
        node.setAttribute("mutaplasmid", mutant.mutaplasmid.item.name)
        node.setAttribute("mutated_attrs", renderMutantAttrs(mutant))

    for i, fit in enumerate(fits):
        if progress:
            if progress.userCancelled:
                return None
            processedFits = i + 1
            progress.current = processedFits
            progress.message = "converting to xml (%s/%s) %s" % (processedFits, fit_count, fit.ship.name)
        try:
            fitting = doc.createElement("fitting")
            fitting.setAttribute("name", fit.name)
            fittings.appendChild(fitting)
            description = doc.createElement("description")
            # -- 170327 Ignored description --
            try:
                notes = fit.notes  # unicode

                if notes:
                    notes = notes[:397] + '...' if len(notes) > 400 else notes

                description.setAttribute(
                    "value", re.sub("(\r|\n|\r\n)+", "<br>", notes) if notes is not None else ""
                )
            except (KeyboardInterrupt, SystemExit):
                raise
            except Exception as e:
                pyfalog.warning("read description is failed, msg=%s\n" % e.args)

            fitting.appendChild(description)
            shipType = doc.createElement("shipType")
            shipType.setAttribute("value", fit.ship.name)
            fitting.appendChild(shipType)

            charges = {}
            slotNum = {}
            for module in fit.modules:
                if module.isEmpty:
                    continue

                slot = module.slot

                if slot == FittingSlot.SUBSYSTEM:
                    # Order of subsystem matters based on this attr. See GH issue #130
                    slotId = module.getModifiedItemAttr("subSystemSlot") - 125
                else:
                    if slot not in slotNum:
                        slotNum[slot] = 0

                    slotId = slotNum[slot]
                    slotNum[slot] += 1

                hardware = doc.createElement("hardware")
                hardware.setAttribute("type", module.item.name)
                slotName = FittingSlot(slot).name.lower()
                slotName = slotName if slotName != "high" else "hi"
                hardware.setAttribute("slot", "%s slot %d" % (slotName, slotId))
                if module.isMutated:
                    addMutantAttributes(hardware, module)

                fitting.appendChild(hardware)

                if module.charge:
                    if module.charge.name not in charges:
                        charges[module.charge.name] = 0
                    # `or 1` because some charges (ie scripts) are without qty
                    charges[module.charge.name] += module.numCharges or 1

            for drone in fit.drones:
                hardware = doc.createElement("hardware")
                hardware.setAttribute("qty", "%d" % drone.amount)
                hardware.setAttribute("slot", "drone bay")
                hardware.setAttribute("type", drone.item.name)
                if drone.isMutated:
                    addMutantAttributes(hardware, drone)

                fitting.appendChild(hardware)

            for fighter in fit.fighters:
                hardware = doc.createElement("hardware")
                hardware.setAttribute("qty", "%d" % fighter.amount)
                hardware.setAttribute("slot", "fighter bay")
                hardware.setAttribute("type", fighter.item.name)
                fitting.appendChild(hardware)

            for cargo in fit.cargo:
                if cargo.item.name not in charges:
                    charges[cargo.item.name] = 0
                charges[cargo.item.name] += cargo.amount

            for name, qty in list(charges.items()):
                hardware = doc.createElement("hardware")
                hardware.setAttribute("qty", "%d" % qty)
                hardware.setAttribute("slot", "cargo")
                hardware.setAttribute("type", name)
                fitting.appendChild(hardware)
        except (KeyboardInterrupt, SystemExit):
            raise
        except Exception as e:
            pyfalog.error("Failed on fitID: %d, message: %s" % e.message)
            continue
    text = doc.toprettyxml()

    if callback:
        callback(text)
    else:
        return text