#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2012  Étienne Loks  <etienne.loks_AT_peacefrogsDOTnet>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.

# This program 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# See the file COPYING for details.

"""
Utils: import archaelogical operation from a CSV file
"""

DELIMITER = ";"
QUOTECHAR = '"'

import datetime
import csv, codecs
import re

from django.conf import settings
from django.contrib.auth.models import User
from django.db import transaction

from ishtar_common.models import Town, Person, PersonType
from archaeological_operations.models import Operation, OperationType, Period, \
                                             AdministrativeAct, ActType


def unicode_csv_reader(unicode_csv_data, dialect=csv.excel, **kwargs):
    # csv.py doesn't do Unicode; encode temporarily as UTF-8:
    csv_reader = csv.reader(utf_8_encoder(unicode_csv_data),
                            dialect=dialect, **kwargs)
    for row in csv_reader:
        # decode UTF-8 back to Unicode, cell by cell:
        yield [unicode(cell, 'utf-8') for cell in row]

def utf_8_encoder(unicode_csv_data):
    for line in unicode_csv_data:
        yield line.encode('utf-8')

ope_types = {}
for k in settings.ISHTAR_OPE_TYPES.keys():
    ot, created = OperationType.objects.get_or_create(
                             txt_idx=settings.ISHTAR_OPE_TYPES[k][0],
                             defaults={'label':settings.ISHTAR_OPE_TYPES[k][1],
                                       'preventive':k[0]==u'préventive'})
    ope_types[k] = ot

def parse_multivalue(value):
    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1 \2', name)
    s1 = re.sub('([a-z0-9])([A-Z])', r'\1 \2', s1)
    return re.sub('([0-9])([a-z])', r'\1 \2', s1)

def parse_operationtype(value, preventive, owner):
    value = (preventive.strip(), value.strip())
    if value not in ope_types:
        return None
    return ope_types[value]

periods = {}
for k in settings.ISHTAR_PERIODS.keys():
    periods[k] = Period.objects.get(txt_idx=settings.ISHTAR_PERIODS[k])
periods_keys = periods.keys()
periods_keys.sort(key=len)
periods_keys.reverse()

def parse_period(value):
    value = value[3:] if value.startswith('EUR') else value
    while value.endswith('-'):
        value = value[:-1]
    value = value[3:] if value.startswith('EUR') else value
    if not value:
        return [periods[u'']]
    period, old_val = [], u''
    while value and old_val != value:
        old_val = value
        for k in periods_keys:
            if value.startswith(k):
                period.append(periods[k])
                value = value[len(k):]
                break
    return period

def parse_date(value):
    try:
        return datetime.datetime.strptime(value, '%d/%m/%Y')
    except:
        return None

def parse_surface(value):
    value = value.replace(',', '.')
    try:
        # hectare en metre carrés
        value = float(value) * 10000
        if value:
            return value
        return None
    except:
        return None

def parse_year(value):
    try:
        yr = int(value)
    except:
        return None
    if yr < 1900 or yr > 2100:
        return None
    return yr

def parse_insee(value):
    values = []
    while len(value) > 4:
        values.append(value[:5])
        value = value[5:]
    towns = []
    for value in values:
        try:
            town = Town.objects.get(numero_insee=value)
            towns.append(town)
        except:
            #sys.stderr.write('Numero INSEE : %s non existant en base' % value)
            continue
    return towns

def parse_patriarche(value):
    if not value:
        return
    value = value.replace(' ', '')
    try:
        int(value)
    except:
        return
    return '18' + unicode(value)

def parse_operation_code(value):
    code = value.split('.')[-1]
    try:
        return int(code)
    except:
        return

def parse_title(value):
    if not value:
        return
    return value.title()

def parse_person(surname, name, old_ref, owner):
    values = {"surname":parse_title(surname),
              "name":parse_title(name)}
    q = Person.objects.filter(**values)
    if q.count():
        return q.all()[0]
    else:
        defaults = {'history_modifier':owner,
                    'title':'',
                    'person_type':PersonType.objects.get(
                                txt_idx='head_scientist')}
        defaults.update(values)
        p = Person.objects.create(**defaults)
        return p
# si pas de start date : premier janvier de year

# attrs, convert
DEFAULT_OPE_COLS = [
 [], # numéro de dossier ?
 (('operation_type',), parse_operationtype),
 (('common_name',), unicode),
 (('in_charge', 'name'), unicode),
 (('in_charge', 'surname'), unicode),
 [], # État ?
 [], # Adresse ?
 [], # origine ?
 (('periods',), parse_period),
 [], # Programme ?
 [], # Rattach PC ?
 [], # vide
 (('administrative_act', 'ref_sra'), unicode),
 (('administrative_act', 'signature_date'), parse_date),
 (('start_date',), parse_date),
 (('excavation_end_date',), parse_date),
 (('year',), parse_year),
 [], # identification
 (('code_patriarche',), int),
 [], # X degré
 [], # Y degré
 [], # X saisi ?
 [], # Y saisi ?
 [], # georef
 [], # geometrie
 (('surface',), parse_surface),
]

OPE_COLS = settings.ISHTAR_OPE_COL_FORMAT if settings.ISHTAR_OPE_COL_FORMAT \
                                          else DEFAULT_OPE_COLS

@transaction.commit_manually
def import_operations(values, col_defs=OPE_COLS, update=False, person=None,
                      stdout=None):
    default_person = person or User.objects.order_by('pk').all()[0]
    # key : (class, default, reverse)
    key_classes = {
    'administrative_act':(AdministrativeAct, {'history_modifier':default_person,
                           'act_type':ActType.objects.get(
                                      txt_idx='excavation_order')}, 'operation'),
    }

    ope_default = {'history_modifier':default_person}
    new_ops = 0
    error_ope, error_reversed, error_multis = [], [], []
    for line_idx, vals in enumerate(values):
        if stdout:
            stdout.write("\r* line %d" % (line_idx))
        if not line_idx:
            continue # remove header
        args = {}
        for col_idx, val in enumerate(vals):
            if len(col_defs) <= col_idx or not col_defs[col_idx]:
                continue
            attrs, typ, extra_cols = col_defs[col_idx]
            if not callable(typ):
                typ = globals()[typ]
            c_args = args
            for attr in attrs:
                if attr not in c_args:
                    c_args[attr] = {}
                c_args = c_args[attr]
            try:
                if not extra_cols:
                    v = typ(val)
                else:
                    arguments = [vals[col_number] for col_number in extra_cols]
                    if not [arg for arg in arguments if arg]:
                        continue
                    arguments += [default_person]
                    v = typ(val, *arguments)
            except:
                v = None
            if len(attrs) == 1:
                args[attrs[0]] = v
            elif len(attrs) == 2:
                args[attrs[0]][attrs[1]] = v
            elif len(attrs) == 3:
                args[attrs[0]][attrs[1]][attrs[2]] = v
        # manage exploded dates
        for k in args.keys():
            if '__year' in k:
                key = k[:-len('__year')]
                try:
                    v = datetime.datetime(args[k], args[key+'__month'],
                                          args[key+'__day'])
                    args[key] = v
                except:
                    pass
                args.pop(k)
                args.pop(key+'__month')
                args.pop(key+'__day')
        reversed_items, multis = [], []
        for k in args.keys():
            if k in key_classes:
                cls, default, reverse = key_classes[k]
                default.update(args[k])
                if reverse:
                    reversed_items.append((cls, default, reverse))
                    args.pop(k)
                    continue
                try:
                    obj = cls.objects.get(**default)
                except:
                    obj = cls.objects.create(**default)
                    obj.save()
                transaction.commit()
                args[k] = obj
            elif type(args[k]) == list:
                multis.append((k, args[k]))
                args.pop(k)
        op = None
        if not update and not args['operation_type']:
            #print "Pas d'operation_type"
            continue
        try:
            op = Operation.objects.get(code_patriarche=args['code_patriarche'])
            if not update:
                #print "Code patriarche existant"
                continue
        except:
            pass
        # check
        if not args.get('year') and args.get('start_date'):
            args['year'] = args['start_date'].year
        # creation
        if not op:
            args.update(ope_default)
            #if not args.get('operation_code'):
            #    args['operation_code'] = Operation.get_available_operation_code(
            #                                                    args['year'])
            #try:
            op = Operation.objects.create(**args)
            #op.save()
            new_ops += 1
            #except:
            #    error_ope.append((line_idx, args))
            #    transaction.rollback()
            #    continue
            transaction.commit()
        else: # mise à jour
            try:
                for k in args:
                    if getattr(op, k):
                        continue
                    setattr(op, k, args[k])
                op.save()
            except:
                transaction.rollback()
                continue
            transaction.commit()
        try:
            for cls, default, reverse in reversed_items:
                default[reverse] = op
                it = cls(**default).save()
        except:
            transaction.rollback()
            error_reversed.append((line_idx, reversed_items))
            continue
        transaction.commit()
        try:
            for k, vals in multis:
                for v in vals:
                    getattr(op, k).add(v)
                    op.save()
        except:
            transaction.rollback()
            error_multis.append((line_idx, multis))
            continue
        transaction.commit()

    errors = []
    if error_ope:
        error = "Error while recording theses operations:\n"
        for line_idx, args in error_ope:
            error += "line: " + str(line_idx) + " args: " + str(args) + '\n'
        errors.append(error)
    if error_multis:
        error = "Error while recording theses multiples items attached to "\
                "operation:"
        for line_idx, args in error_multis:
            error += "line: " + str(line_idx) + " args: " + str(args) + '\n'
        errors.append(error)
    if error_reversed:
        error = "Error while recording theses items that depend to operation:"
        for line_idx, args in error_reversed:
            error += "line: " + str(line_idx) + " args: " + str(args) + '\n'
        errors.append(error)
    return new_ops, errors

def import_from_csv(filename, update=False, col_defs=OPE_COLS,
                    person=None, stdout=None):
    """
    Import from a CSV file.
    Return number of operation treated and errors.
    """
    try:
        values = unicode_csv_reader(codecs.open(filename, 'rb', "utf-8"),
                        delimiter=DELIMITER, quotechar=QUOTECHAR)
    except (IOError):
        return 0, [u"Incorrect CSV file."]

    new_ops, errors = import_operations(values, col_defs=col_defs,
                                    update=update, person=person, stdout=stdout)
    return new_ops, errors