import copy
import json
import logging
import subprocess
import sys
from io import StringIO
from pathlib import Path

from flectra import models, fields, api, _
from flectra.tools import config, etree, base64, convert_xml_import, tempfile

import os

from flectra.exceptions import ValidationError

_logger = logging.getLogger(__name__)


class MisBuilderImportWizard(models.TransientModel):
    # Private attributes
    _name = "mis.builder.import.wizard"
    _description = "Import MIS Builder Report"

    file = fields.Binary(
            string='Settings File',
            required=True,
    )

    def __int__(self):
        super(MisBuilderImportWizard, self).__int__()

    def import_report(self):
        self.ensure_one()

        json_data = base64.b64decode(self.file)
        report_data = json.loads(json_data)

        for report_entry in report_data:
            report_values = self.__prepare_report_values(report_entry)

            self.__prepare_style_values(report_entry, report_values)

            self.__prepare_subreport_values(report_entry, report_values)

            self.__prepare_query_values(report_values)

            self.__prepare_kpi_values(report_values)

            subkpi_values = []
            if report_values.get('subkpi_ids'):
                for subkpi_value in report_values['subkpi_ids']:
                    subkpi_values.append(subkpi_value)
                del report_values['subkpi_ids']

            new_report = self.env['mis.report'].create(report_values)
            self._create_external_reference(new_report, report_entry['extid'])

            self.__update_subkpi_values(new_report, report_entry, subkpi_values)

    def __prepare_style_values(self, report_entry, report_values):
        if report_entry.get('style_id'):
            report_values['style_id'] = self._create_style(report_values['style_id']).id

    def __prepare_report_values(self, report_entry):
        result = self.env['ir.model.data'].xmlid_to_res_id(report_entry['extid'])
        if result:
            raise ValidationError('Report already exists! Please delete it first before importing')
        report_values = copy.deepcopy(report_entry)

        del report_values['extid']
        for kpi in report_values.get('kpi_ids', []):
            del kpi['extid']
            for expr in kpi.get('expression_ids', []):
                del expr['extid']

        for kpi in report_values.get('subkpi_ids', []):
            del kpi['extid']
            for expr in kpi.get('expression_ids', []):
                del expr['extid']
        report_values['move_lines_source'] = self.env['ir.model'].search([('model', '=', report_values['move_lines_source'])]).id
        return report_values

    def __update_subkpi_values(self, new_report, report_entry, subkpi_values):
        temporary_extids = self.env['ir.model.data']
        subkpi_updates = []
        if subkpi_values:
            for kpi_id in new_report.kpi_ids:
                for kpi_data in report_entry['kpi_ids']:
                    if kpi_id.sequence == kpi_data['sequence']:
                        temporary_extids |= self._create_external_reference(kpi_id, kpi_data['extid'])
            for subkpi_value in subkpi_values:
                expression_updates = []
                for expression_value in subkpi_value['expression_ids']:
                    expression_value['kpi_id'] = self.env.ref(expression_value['kpi_id']).id
                    expression_updates.append((0, False, expression_value))
                subkpi_value['expression_ids'] = expression_updates
                subkpi_updates.append((0, False, subkpi_value))
        if subkpi_updates:
            new_report.write({'subkpi_ids': subkpi_updates})
        if temporary_extids:
            temporary_extids.unlink()

    def __prepare_kpi_values(self, report_values):
        if report_values.get('kpi_ids'):
            kpi_values = []
            for kpi_value in report_values['kpi_ids']:
                self.__prepare_style_values(kpi_value, kpi_value)
                if kpi_value.get('auto_expand_accounts_style_id'):
                    kpi_value['auto_expand_accounts_style_id'] = self._create_style(kpi_value['auto_expand_accounts_style_id']).id
                if report_values.get('subkpi_ids'):
                    del kpi_value['expression']
                    del kpi_value['expression_ids']
                else:
                    if kpi_value.get('expression_ids'):
                        expression_values = [(0, False, v) for v in kpi_value['expression_ids']]
                        kpi_value['expression_ids'] = expression_values
                kpi_values.append((0, False, kpi_value))
            report_values['kpi_ids'] = kpi_values

    def __prepare_query_values(self, report_values):
        if report_values.get('query_ids'):
            query_values = []
            for query_value in report_values['query_ids']:
                query_model = self.env['ir.model'].search([('model', '=', query_value['model_id'])])
                query_value['model_id'] = query_model.id
                query_value['field_ids'] = [(6, 0, [f.id for f in query_model.field_id if f.name in query_value['field_ids']])]
                query_values.append((0, False, query_value))
            report_values['query_ids'] = query_values

    def __prepare_subreport_values(self, report_entry, report_values):
        if report_entry.get('subreport_ids'):
            subreport_values = []
            for subreport_value in report_entry['subreport_ids']:
                subreport_value['subreport_id'] = self.env.ref(subreport_value['subreport_id']).id
                subreport_values.append((0, False, subreport_value))
            report_values['subreport_ids'] = subreport_values

    @api.model
    def _create_style(self, style_data):
        exit_id = style_data['extid']
        result = self.env['ir.model.data'].xmlid_to_object(exit_id)
        if result:
            return result

        del style_data['extid']
        new_style = self.env['mis.report.style'].create(style_data)
        self._create_external_reference(new_style, exit_id)
        return new_style

    def _create_external_reference(self, obj, extid, temporary=False):
        module, name = extid.split('.', 1)
        existing = self.env['ir.model.data'].search([
            ('module', '=', module),
            ('model', '=', obj._name),
            ('name', '=', name),
        ], limit=1)
        if existing:
            existing.res_id = obj.id
            return existing

        return self.env['ir.model.data'].create({
            'module': module,
            'model': obj._name,
            'name': name,
            'res_id': obj.id,
        })