"""
Various helpers for use by the wmlunits tool.
"""
import sys, os, re, glob, shutil, copy, urllib2, subprocess

import wesnoth.wmlparser2 as wmlparser2
import wesnoth.wmltools as wmltools

def get_datadir(wesnoth_exe):
    p = subprocess.Popen([wesnoth_exe, "--path"],
        stdout = subprocess.PIPE, stderr = subprocess.PIPE)
    out, err = p.communicate()
    return out.strip()

def get_userdir(wesnoth_exe):
    p = subprocess.Popen([wesnoth_exe, "--config-path"],
        stdout = subprocess.PIPE, stderr = subprocess.PIPE)
    out, err = p.communicate()
    return out.strip()

class Image:
    def __init__(self, id_name, ipath, bases, no_tc):
        self.id_name = id_name
        self.ipath = ipath # none if it was not found
        self.bases = bases
        self.no_tc = no_tc
        self.addons = set()

class ImageCollector:
    """
    A class to collect all the images which need to be copied to the HTML
    output folder.
    """
    def __init__(self, wesnoth_exe, userdir, datadir):
        self.images_by_addon_name = {}
        self.images_by_ipath = {}
        self.binary_paths_per_addon = {}
        self.datadir = datadir
        self.userdir = userdir

        if not self.datadir: self.datadir = get_datadir(wesnoth_exe)
        if not self.userdir: self.userdir = get_userdir(wesnoth_exe)

    def add_binary_paths_from_WML(self, addon, WML):
        for binpath in WML.get_all(tag = "binary_path"):
            path = binpath.get_text_val("path")
            if addon not in self.binary_paths_per_addon:
                self.binary_paths_per_addon[addon] = []
            self.binary_paths_per_addon[addon].append(path)

    def _find_image(self, addon, name):
        
        tilde = name.find("~")
        if tilde >= 0:
            name = name[:tilde]
        
        bases = [os.path.join(self.datadir, "data/core/images")]
        binpaths = self.binary_paths_per_addon.get(addon, [])[:]
        binpaths.reverse()
        for x in binpaths:
            for idir in ["images", "images/units"]:
                bases.append(os.path.join(self.datadir, x, idir))
                bases.append(os.path.join(self.userdir, x, idir))

        bases = [os.path.join("%s" % base, name) for base in bases]

        for ipath in bases:
            if os.path.exists(ipath): return ipath, bases
        return None, bases

    def add_image_check(self, addon, name, no_tc = False):
        if (addon, name) in self.images_by_addon_name:
            image = self.images_by_addon_name[(addon, name)]
            if addon not in image.addons: image.addons.add(addon)
            return image

        ipath, bases = self._find_image(addon, name)
        if ipath in self.images_by_ipath:
            image = self.images_by_ipath[ipath]
            if addon not in image.addons: image.addons.add(addon)
            return image
            
        def make_name(x):
            if x.startswith(options.config_dir): x = x[len(options.config_dir):]
            if x.startswith("data/core/"): x = x[len("data/core/"):]
            if x.startswith("images/"): x = x[len("images/"):]
            x = x.strip("./ ")
            y = ""
            for c in x:
                if c == "/": c = "$"
                elif not c.isalnum() and c not in ".+-()[]{}": c = "_"
                y += c
            return y

        if ipath:
            id_name = make_name(ipath)
        else:
            id_name = make_name(addon + "/" + name)

        image = Image(id_name, ipath, bases, no_tc)
        image.addons.add(addon)
        
        self.images_by_addon_name[(addon, name)] = image
        if ipath:
            self.images_by_ipath[ipath] = image
            
        return image

    def add_image(self, addon, path, no_tc = False):
        image = self.add_image_check(addon, path, no_tc)
        return image.id_name

    def copy_and_color_images(self, target_path):
        for image in self.images_by_ipath.values():
            opath = os.path.join(target_path, "pics", image.id_name)
            try:
                os.makedirs(os.path.dirname(opath))
            except OSError:
                pass

            no_tc = image.no_tc
            
            ipath = os.path.normpath(image.ipath)
            cdir = os.path.normpath(options.config_dir + "/data/add-ons")
            if ipath.startswith(cdir):
                ipath = os.path.join(options.addons, ipath[len(cdir):].lstrip("/"))
            if ipath and os.path.exists(ipath):
                if no_tc:
                    shutil.copy2(ipath, opath)
                else:
                    # We assume TeamColorizer is in the same directory as the
                    # helpers.py currently executing.
                    command = os.path.join(os.path.dirname(__file__),
                        "TeamColorizer")
                    p = subprocess.Popen([command, ipath, opath])
                    p.wait()
            else:
                sys.stderr.write(
                    "Warning: Required image %s does not exist (referenced by %s).\n" % (
                        image.id_name, ", ".join(image.addons)))
                if options.verbose:
                    if image.bases:
                        sys.stderr.write("Warning: Looked at the following locations:\n")
                        sys.stderr.write("\n".join(image.bases) + "\n")
                    else:
                        sys.stderr.write("nowhere\n")

blah = 1
class WesnothList:
    """
    Lists various Wesnoth stuff like units, campaigns, terrains, factions...
    """
    def __init__(self, wesnoth_exe, config_dir, data_dir, transdir):
        self.unit_lookup = {}
        self.race_lookup = {}
        self.terrain_lookup = {}
        self.movetype_lookup = {}
        self.era_lookup = {}
        self.campaign_lookup = {}
        self.parser = wmlparser2.Parser(wesnoth_exe, config_dir,
            data_dir, no_preprocess = False)


    def add_terrains(self):
        """
        We need those for movement costs and defenses.
        """
        self.parser.parse_text("{core/terrain.cfg}\n")

        n = 0
        for terrain in self.parser.get_all(tag = "terrain_type"):
            tstring = terrain.get_text_val("string")
            self.terrain_lookup[tstring] = terrain
            n += 1
        return n
    
    def add_languages(self, languages):
        """
        Returns a dictionary mapping isocodes to languages.
        """
        self.languages_found = {}

        parser = wmlparser2.Parser(options.wesnoth, options.config_dir,
            options.data_dir, no_preprocess = False)
        parser.parse_text("{languages}")

        for locale in parser.get_all(tag="locale"):
            isocode = locale.get_text_val("locale")
            name = locale.get_text_val("name")
            if isocode == "ang_GB":
                continue
            self.languages_found[isocode] = name

    def add_era(self, era):
        """
        For an era, list all factions and units in it.
        """
        eid = era.get_text_val("id")
        if not eid: return
        self.era_lookup[eid] = era
        era.faction_lookup = {}
        for multiplayer_side in era.get_all(tag = "multiplayer_side"):
            fid = multiplayer_side.get_text_val("id")
            if fid == "Random": continue
            era.faction_lookup[fid] = multiplayer_side
            recruit = multiplayer_side.get_text_val("recruit", "").strip()
            leader = multiplayer_side.get_text_val("leader", "").strip()
            units = recruit.split(",")
            leaders = leader.split(",")
            multiplayer_side.units = {}
            multiplayer_side.is_leader = {}
            for u in units:
                uid = u.strip()
                if uid:
                    multiplayer_side.units[uid] = True
            for u in leaders:
                uid = u.strip()
                if uid:
                    multiplayer_side.units[uid] = True
                    multiplayer_side.is_leader[uid] = True
        return eid

    def add_binary_paths(self, addon, image_collector):
        image_collector.add_binary_paths_from_WML(addon, self.parser.root)

    def add_campaign(self, campaign):
        name = campaign.get_text_val("id")
        if not name:
            global blah
            name = "noid%d" % blah
            blah += 1
        self.campaign_lookup[name] = campaign
        return name

    def add_mainline_eras(self):
        """
        Find all mainline eras.
        """
        self.parser.parse_text("{multiplayer/eras.cfg}")

        n = 0
        for era in self.parser.get_all(tag = "era"):
            self.add_era(era)
            n += 1
        return n

    def add_units(self, campaign):
        """
        We assume each unit, in mainline and all addons, has one unique id. So
        we reference them everywhere by this id, and here can add them all to
        one big collection.
        """
        addunits = self.parser.get_all(tag = "units")
        addunits += self.parser.get_all(tag = "+units")
        if not addunits: return 0

        def getall(oftype):
            r = []
            r = []
            for units in addunits:
                r += units.get_all(tag = oftype)
            return r

        # Find all unit types.
        newunits = getall("unit_type") + getall("unit")
        for unit in newunits:
            if unit.get_text_val("do_not_list", "no") == "no" and\
               unit.get_text_val("hide_help", "no") in ["no", "false"]:
                uid = unit.get_text_val("id")
                unit.id = uid
                if uid in self.unit_lookup:
                    unit = self.unit_lookup[uid]
                    # TODO: We might want to compare the two units
                    # with the same id and if one is different try
                    # to do something clever like rename it...
                else:
                    self.unit_lookup[uid] = unit
                if not hasattr(unit, "campaigns"): unit.campaigns = []
                unit.campaigns.append(campaign)

        # Find all races.
        newraces = getall("race")
        for race in newraces:
            rid = race.get_text_val("id")
            if rid == None:
                rid = race.get_text_val("name")

            self.race_lookup[rid] = race

        # Find all movetypes.
        newmovetypes = getall("movetype")
        for movetype in newmovetypes:
            mtname = movetype.get_text_val("name")
            self.movetype_lookup[mtname] = movetype

        # Store race/movetype/faction of each unit for easier access later.
        for unit in newunits:
            uid = unit.get_text_val("id")
            race = self.get_unit_value(unit, "race")
            try:
                unit.race = self.race_lookup[race]
                unit.rid = unit.race.get_text_val("id", "none")
            except KeyError:
                unit.race = None
                unit.rid = "none"
                error_message("Warning: No race \"%s\" found (%s).\n" % (
                    race, unit.get_text_val("id")))
            movetype = self.get_unit_value(unit, "movement_type")
            try: unit.movetype = self.movetype_lookup[movetype]
            except KeyError: unit.movetype = None

            unit.advance = []
            advanceto = unit.get_text_val("advances_to")
            # Add backwards compatibility for 1.4
            if not advanceto:
                advanceto = unit.get_text_val("advanceto")
            if advanceto and advanceto != "null":
                for advance in advanceto.split(","):
                    auid = advance.strip()
                    if auid: unit.advance.append(auid)

            # level
            try:
                level = int(self.get_unit_value(unit, "level"))
            except TypeError:
                level = 0
            except ValueError:
                level = 0
            if level < 0: level = 0
            unit.level = level

        return len(newunits)

    def check_units(self):
        """
        Once all units have been added, do some checking.
        """
        
        # handle advancefrom tags
        for uid, unit in self.unit_lookup.items():
            for advancefrom in unit.get_all(tag = "advancefrom"):
                fromid = advancefrom.get_text_val("unit")
                if fromid:
                    try:
                        fromunit = self.unit_lookup[fromid]
                    except KeyError:
                        error_message(
                            "Error: Unit '%s' references non-existant [advancefrom] unit '%s'" % (
                                uid, fromid))
                        continue
                    if uid not in fromunit.advance:
                        fromunit.advance.append(uid)

    def find_unit_factions(self):
        for unit in self.unit_lookup.values():
            unit.factions = []
            unit.eras = []

        for eid, era in self.era_lookup.items():
            for fid, multiplayer_side in era.faction_lookup.items():
                for uid in multiplayer_side.units:
                    try:
                        unit = self.unit_lookup[uid]
                    except KeyError:
                        error_message(
                            ("Error: Era '%s' faction '%s' references " +
                            "non-existant unit id '%s'!\n") % (
                                eid,
                                fid,
                                str(uid)))
                        continue
                    if not eid in unit.eras:
                        unit.eras.append(eid)
                    unit.factions.append((eid, fid))
        
        # as a special case, add units from this addon but with no faction
        for unit in self.unit_lookup.values():
            if unit.campaigns[0] == self.cid:
                if not unit.factions:
                    if not eid in unit.eras:
                        unit.eras.append(eid)
                    unit.factions.append((eid, None))
        

    def get_base_unit(self, unit):
        b = unit.get_all(tag = "base_unit")
        if b:
            b = b[0]
            buid = b.get_text_val("id")
            try: baseunit = self.unit_lookup[buid]
            except KeyError:
                error_message(
                    "Warning: No baseunit \"%s\" for \"%s\".\n" % (
                    buid, unit.get_text_val("id")))
                return None
            return baseunit
        return None

    def get_unit_value(self, unit, attribute, default = None, translation = None):
        value = unit.get_text_val(attribute, None, translation)
        if value == None:
            baseunit = self.get_base_unit(unit)
            if baseunit:
                return self.get_unit_value(baseunit, attribute, default, translation)
            return default
        return value

class UnitForest:
    """
    Contains the forest of unit advancement trees.
    """
    def __init__(self):
        self.trees = {}
        self.lookup = {}

    def add_node(self, un):
        """
        Add a new unit to the forest.
        """
        self.lookup[un.id] = un

    def create_network(self):
        """
        Assuming that each node which has been added to the tree only has a
        valid list of children in unit.child_ids, also fill in unit.parent_ids
        and update the unit.children shortcut.
        """

        # Complete the network
        for uid, u in self.lookup.items():
            for cid in u.child_ids:
                c = self.lookup.get(cid, None)
                if not c: continue
                u.children.append(c)
                if not uid in c.parent_ids:
                    c.parent_ids.append(uid)

        # Put all roots into the forest
        for uid, u in self.lookup.items():
            if not u.parent_ids:
                self.trees[uid] = u

        # Sanity check because some argGRRxxx addons have units who advance to
        # themselves.

        def recurse(u, already):
            already2 = already.copy()
            for c in u.children[:]:
                already2[c.id] = True
                if c.id in already:
                    error_message(
                        ("Warning: Unit %s advances to unit %s in a loop.\n" %
                        (u.id, c.id)) +
                        ("    Removing advancement %s.\n" % c.id))
                    u.children.remove(c)
            for c in u.children:
                recurse(c, already2)
        for u in self.trees.values():
            already = {u.id : True}
            recurse(u, already)

    def update(self):
        self.create_network()

        self.breadth = sum([x.update_breadth() for x in self.trees.values()])
        return self.breadth

    def get_children(self, uid):
        un = self.lookup[uid]
        return un.child_ids

    def get_parents(self, uid):
        un = self.lookup[uid]
        return un.parent_ids

class UnitNode:
    """
    A node in the advancement trees forest.
    """
    def __init__(self, unit):
        self.unit = unit
        self.children = []
        self.id = unit.get_text_val("id")
        self.child_ids = []
        self.parent_ids = []
        self.child_ids.extend(unit.advance)

    def update_breadth(self):
        if not self.children:
            self.breadth = 1
        else:
            self.breadth = sum([x.update_breadth() for x in self.children])
        return self.breadth

class GroupNode:
    def __init__(self, data):
        self.data = data
