# -*- coding: utf-8 -*-
# Part of Odoo, Flectra. See LICENSE file for full copyright and licensing details.

from collections import deque
import json

from flectra import http
from flectra.http import request
from flectra.tools import ustr
from flectra.tools.misc import xlwt


class TableExporter(http.Controller):

    @http.route('/web/pivot/check_xlwt', type='json', auth='none')
    def check_xlwt(self):
        return xlwt is not None

    @http.route('/web/pivot/export_xls', type='http', auth="user")
    def export_xls(self, data, token):
        jdata = json.loads(data)
        nbr_measures = jdata['nbr_measures']
        workbook = xlwt.Workbook()
        worksheet = workbook.add_sheet(jdata['title'])
        header_bold = xlwt.easyxf("font: bold on; pattern: pattern solid, fore_colour gray25;")
        header_plain = xlwt.easyxf("pattern: pattern solid, fore_colour gray25;")
        bold = xlwt.easyxf("font: bold on;")

        # Step 1: writing headers
        headers = jdata['headers']

        # x,y: current coordinates
        # carry: queue containing cell information when a cell has a >= 2 height
        #      and the drawing code needs to add empty cells below
        x, y, carry = 1, 0, deque()
        for i, header_row in enumerate(headers):
            worksheet.write(i, 0, '', header_plain)
            for header in header_row:
                while (carry and carry[0]['x'] == x):
                    cell = carry.popleft()
                    for i in range(nbr_measures):
                        worksheet.write(y, x+i, '', header_plain)
                    if cell['height'] > 1:
                        carry.append({'x': x, 'height': cell['height'] - 1})
                    x = x + nbr_measures
                style = header_plain if 'expanded' in header else header_bold
                for i in range(header['width']):
                    worksheet.write(y, x + i, header['title'] if i == 0 else '', style)
                if header['height'] > 1:
                    carry.append({'x': x, 'height': header['height'] - 1})
                x = x + header['width']
            while (carry and carry[0]['x'] == x):
                cell = carry.popleft()
                for i in range(nbr_measures):
                    worksheet.write(y, x+i, '', header_plain)
                if cell['height'] > 1:
                    carry.append({'x': x, 'height': cell['height'] - 1})
                x = x + nbr_measures
            x, y = 1, y + 1

        # Step 2: measure row
        if nbr_measures > 1:
            worksheet.write(y, 0, '', header_plain)
            for measure in jdata['measure_row']:
                style = header_bold if measure['is_bold'] else header_plain
                worksheet.write(y, x, measure['measure'], style)
                x = x + 1
            y = y + 1

        # Step 3: writing data
        x = 0
        for row in jdata['rows']:
            worksheet.write(y, x, row['indent'] * '     ' + ustr(row['title']), header_plain)
            for cell in row['values']:
                x = x + 1
                if cell.get('is_bold', False):
                    worksheet.write(y, x, cell['value'], bold)
                else:
                    worksheet.write(y, x, cell['value'])
            x, y = 0, y + 1

        response = request.make_response(None,
            headers=[('Content-Type', 'application/vnd.ms-excel'),
                    ('Content-Disposition', 'attachment; filename=table.xls;')],
            cookies={'fileToken': token})
        workbook.save(response.stream)

        return response