#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2013  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 DBF file
"""

from __future__ import unicode_literals

import datetime
import dbf
import re

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

from archaeological_operations.import_from_csv import parse_operationtype, \
                    parse_multivalue, parse_person as _parse_person, parse_date
from archaeological_operations.models import Operation, OperationType, Period, \
                                             AdministrativeAct, ActType

def parse_person(surname, name, owner):
    return _parse_person(surname, name, None, owner)

def parse_ha(value):
    try:
        val = float(value)
    except ValueError:
        val = 0
    return val * 10000

ope_types = {
    'AET':('other_study',
           'Autre étude', True),
    'APP':('assistance_preparation_help',
           'Aide à la préparation de publication', True),
    'DOC':('documents_study',
           'Étude documentaire', True),
    'EV':('evaluation',
          "Fouille d'évaluation", True),
    'FOU':('ancient_excavation',
           "Fouille ancienne", True),
    'FP':('prog_excavation',
          "Fouille programmée", False),
    'MH':('building_study', "Fouille avant MH", True),
    'OPD':('diag_prev_excavation',
           "Opération préventive de diagnostic", True),
    'PAN':('analysis_program',
           "Programme d'analyses", False),
    'PCR':('collective_research_project',
           "Projet collectif de recherche", False),
    'PMS':('specialized_eqp_prospection',
           "Prospection avec matériel spécialisé", False),
    'PRD':('diachronic_prospection',
           "Prospection diachronique", False),
    'PI':('diachronic_prospection',
           "Prospection diachronique", False),
    'PRM':('metal_detector_prospection',
           "Prospection détecteur de métaux", False),
    'PRT':('thematic_prospection',
           "Prospection thématique", False),
    'PT':('thematic_prospection',
           "Prospection thématique", False),
    'RAR':('cave_art_record',
           "Relevé d'art rupestre", False),
    'SD':('sampling_research',
          "Sondage", False),
    'SP':('prev_excavation',
          "Fouille préventive", True),
    'SU':('emergency_excavation',
          "Fouille préventive d'urgence", True),
}

_CACHED_OPE_TYPES = {}

def _prepare_ope_types():
    for k in ope_types.keys():
        txt_idx, label, preventive = ope_types[k]
        ot, created = OperationType.objects.get_or_create(txt_idx=txt_idx,
                              defaults={'label':label, 'preventive':preventive})
        if k not in _CACHED_OPE_TYPES.keys():
            _CACHED_OPE_TYPES[k] = ot

def parse_patriarche_operationtype(value):
    if value not in _CACHED_OPE_TYPES.keys():
        print value
        return None
    return _CACHED_OPE_TYPES[value]

_dpt_re_filter = re.compile('^\([0-9]*\) ')

def parse_ope_name(value):
    if not value:
        return ''
    value = value.strip()
    if value.lower() == 'null':
        return ''
    value = _dpt_re_filter.sub('', value)
    return value

PATRIARCHE_DBF_OPE_COLS = [
 (('operation_type',), 'parse_patriarche_operationtype', []),
 (('common_name',), 'parse_ope_name', []),
 [],
 (('in_charge',), 'parse_person', [2]),
 [],  #'etat',
 (('comment',), unicode, []),  #'adresse',
 [],  #'origine C(3)',
 [],  # 'chronologi C(12)',
 [],  #'programme C(254)',
 [],  # 'rattach_pc C(254)',
 [],  # 'code_dossi N(8,0)',
 (('administrative_act', 'ref_sra'), unicode, []),
 (('administrative_act', 'signature_date'), parse_date, []),
 (('start_date',), parse_date, []),
 (('end_date',), parse_date, []),
 (('year',), int, []),
 [],  # 'identifica C(254)',
 (('code_patriarche',), int, []),
 [],  # 'x_degre N(16,6)',
 [],  # 'y_degre N(16,6)',
 [],  # 'x_saisi C(12)',
 [],  # 'y_saisi C(12)',
 [],  # 'georeferen C(3)',
 [],  # 'geometrie C(3)',
 (('surface',), parse_ha, [])
]

DBF_OPE_COLS = PATRIARCHE_DBF_OPE_COLS

def import_from_dbf(filename, update=False, col_defs=DBF_OPE_COLS,
                    person=None, stdout=None):
    """
    Import from a DBF file.
    Return number of operation treated and errors.
    """
    try:
        table =  dbf.Table(filename)
    except (dbf.DbfError, TypeError):
        return 0, ["Incorrect DBF file."]

    new_ops, errors = import_operations_dbf(table, col_defs=col_defs,
                                    update=update, person=person, stdout=stdout)
    return new_ops, errors

ERROR_LBLS = {'missing_ope_type':'* Missing operation type: ',
              'missing_patriarche_code':'* Missing patriarche code: '}

@transaction.commit_manually
def import_operations_dbf(values, col_defs=DBF_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'),
    }
    # prepare ope types
    _prepare_ope_types()

    ope_default = {'history_modifier':default_person}
    current_import = []
    new_ops = 0
    errors_nb = {}
    for error in ERROR_LBLS.keys():
        errors_nb[error] = 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]
            if not extra_cols:
                try:
                    v = typ(val)
                except TypeError:
                    v = None
            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)
            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.get('operation_type'):
            errors_nb['missing_ope_type'] += 1
            continue
        try:
            op = Operation.objects.get(code_patriarche=args['code_patriarche'])
            if not update and op.pk not in current_import:
                errors_nb['already_available_patriarche_code'] += 1
                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)
            for k in args.keys():
                if not args[k]:
                    args.pop(k)
            op = Operation.objects.create(**args)
            new_ops += 1
            transaction.commit()
            current_import.append(op.pk)
        else: # mise à jour
            try:
                for k in args:
                    if not args[k]:
                        args[k] = None
                    #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 = []
    for error_key in errors_nb:
        nb_error = errors_nb[error_key]
        if nb_error:
            errors.append(ERROR_LBLS[error_key] + str(nb_error))
    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