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

import calendar
from datetime import date, datetime
from dateutil.relativedelta import relativedelta

from odoo import api, fields, models, _
from odoo.exceptions import UserError, ValidationError
from odoo.tools import DEFAULT_SERVER_DATE_FORMAT as DF
from odoo.tools import float_compare, float_is_zero


class AccountAssetCategory(models.Model):
    _name = 'account.asset.category'
    _description = 'Asset category'

    active = fields.Boolean(default=True)
    name = fields.Char(required=True, index=True, string="Asset Type")
    account_analytic_id = fields.Many2one('account.analytic.account', string='Analytic Account')
    account_asset_id = fields.Many2one('account.account', string='Asset Account', required=True, domain=[('internal_type','=','other'), ('deprecated', '=', False)], help="Account used to record the purchase of the asset at its original price.")
    account_depreciation_id = fields.Many2one('account.account', string='Depreciation Entries: Asset Account', required=True, domain=[('internal_type','=','other'), ('deprecated', '=', False)], help="Account used in the depreciation entries, to decrease the asset value.")
    account_depreciation_expense_id = fields.Many2one('account.account', string='Depreciation Entries: Expense Account', required=True, domain=[('internal_type','=','other'), ('deprecated', '=', False)], oldname='account_income_recognition_id', help="Account used in the periodical entries, to record a part of the asset as expense.")
    journal_id = fields.Many2one('account.journal', string='Journal', required=True)
    company_id = fields.Many2one('res.company', string='Company', required=True, default=lambda self: self.env['res.company']._company_default_get('account.asset.category'))
    method = fields.Selection([('linear', 'Linear'), ('degressive', 'Degressive')], string='Computation Method', required=True, default='linear',
        help="Choose the method to use to compute the amount of depreciation lines.\n"
            "  * Linear: Calculated on basis of: Gross Value / Number of Depreciations\n"
            "  * Degressive: Calculated on basis of: Residual Value * Degressive Factor")
    method_number = fields.Integer(string='Number of Depreciations', default=5, help="The number of depreciations needed to depreciate your asset")
    method_period = fields.Integer(string='Period Length', default=1, help="State here the time between 2 depreciations, in months", required=True)
    method_progress_factor = fields.Float('Degressive Factor', default=0.3)
    method_time = fields.Selection([('number', 'Number of Entries'), ('end', 'Ending Date')], string='Time Method', required=True, default='number',
        help="Choose the method to use to compute the dates and number of entries.\n"
           "  * Number of Entries: Fix the number of entries and the time between 2 depreciations.\n"
           "  * Ending Date: Choose the time between 2 depreciations and the date the depreciations won't go beyond.")
    method_end = fields.Date('Ending date')
    prorata = fields.Boolean(string='Prorata Temporis', help='Indicates that the first depreciation entry for this asset have to be done from the purchase date instead of the first of January')
    open_asset = fields.Boolean(string='Auto-Confirm Assets', help="Check this if you want to automatically confirm the assets of this category when created by invoices.")
    group_entries = fields.Boolean(string='Group Journal Entries', help="Check this if you want to group the generated entries by categories.")
    type = fields.Selection([('sale', 'Sale: Revenue Recognition'), ('purchase', 'Purchase: Asset')], required=True, index=True, default='purchase')
    date_first_depreciation = fields.Selection([
        ('last_day_period', 'Based on Last Day of Purchase Period'),
        ('manual', 'Manual (Defaulted on Purchase Date)')],
        string='Depreciation Dates', default='manual', required=True,
        help='The way to compute the date of the first depreciation.\n'
             '  * Based on last day of purchase period: The depreciation dates will be based on the last day of the purchase month or the purchase year (depending on the periodicity of the depreciations).\n'
             '  * Based on purchase date: The depreciation dates will be based on the purchase date.')

    @api.onchange('account_asset_id')
    def onchange_account_asset(self):
        if self.type == "purchase":
            self.account_depreciation_id = self.account_asset_id
        elif self.type == "sale":
            self.account_depreciation_expense_id = self.account_asset_id

    @api.onchange('type')
    def onchange_type(self):
        if self.type == 'sale':
            self.prorata = True
            self.method_period = 1
        else:
            self.method_period = 12

    @api.onchange('method_time')
    def _onchange_method_time(self):
        if self.method_time != 'number':
            self.prorata = False


class AccountAssetAsset(models.Model):
    _name = 'account.asset.asset'
    _description = 'Asset/Revenue Recognition'
    _inherit = ['mail.thread']

    entry_count = fields.Integer(compute='_entry_count', string='# Asset Entries')
    name = fields.Char(string='Asset Name', required=True, readonly=True, states={'draft': [('readonly', False)]})
    code = fields.Char(string='Reference', size=32, readonly=True, states={'draft': [('readonly', False)]})
    value = fields.Float(string='Gross Value', required=True, readonly=True, digits=0, states={'draft': [('readonly', False)]}, oldname='purchase_value')
    currency_id = fields.Many2one('res.currency', string='Currency', required=True, readonly=True, states={'draft': [('readonly', False)]},
        default=lambda self: self.env.user.company_id.currency_id.id)
    company_id = fields.Many2one('res.company', string='Company', required=True, readonly=True, states={'draft': [('readonly', False)]},
        default=lambda self: self.env['res.company']._company_default_get('account.asset.asset'))
    note = fields.Text()
    category_id = fields.Many2one('account.asset.category', string='Category', required=True, change_default=True, readonly=True, states={'draft': [('readonly', False)]})
    date = fields.Date(string='Date', required=True, readonly=True, states={'draft': [('readonly', False)]}, default=fields.Date.context_today, oldname="purchase_date")
    state = fields.Selection([('draft', 'Draft'), ('open', 'Running'), ('close', 'Close')], 'Status', required=True, copy=False, default='draft',
        help="When an asset is created, the status is 'Draft'.\n"
            "If the asset is confirmed, the status goes in 'Running' and the depreciation lines can be posted in the accounting.\n"
            "You can manually close an asset when the depreciation is over. If the last line of depreciation is posted, the asset automatically goes in that status.")
    active = fields.Boolean(default=True)
    partner_id = fields.Many2one('res.partner', string='Partner', readonly=True, states={'draft': [('readonly', False)]})
    method = fields.Selection([('linear', 'Linear'), ('degressive', 'Degressive')], string='Computation Method', required=True, readonly=True, states={'draft': [('readonly', False)]}, default='linear',
        help="Choose the method to use to compute the amount of depreciation lines.\n  * Linear: Calculated on basis of: Gross Value / Number of Depreciations\n"
            "  * Degressive: Calculated on basis of: Residual Value * Degressive Factor")
    method_number = fields.Integer(string='Number of Depreciations', readonly=True, states={'draft': [('readonly', False)]}, default=5, help="The number of depreciations needed to depreciate your asset")
    method_period = fields.Integer(string='Number of Months in a Period', required=True, readonly=True, default=12, states={'draft': [('readonly', False)]},
        help="The amount of time between two depreciations, in months")
    method_end = fields.Date(string='Ending Date', readonly=True, states={'draft': [('readonly', False)]})
    method_progress_factor = fields.Float(string='Degressive Factor', readonly=True, default=0.3, states={'draft': [('readonly', False)]})
    value_residual = fields.Float(compute='_amount_residual', method=True, digits=0, string='Residual Value')
    method_time = fields.Selection([('number', 'Number of Entries'), ('end', 'Ending Date')], string='Time Method', required=True, readonly=True, default='number', states={'draft': [('readonly', False)]},
        help="Choose the method to use to compute the dates and number of entries.\n"
             "  * Number of Entries: Fix the number of entries and the time between 2 depreciations.\n"
             "  * Ending Date: Choose the time between 2 depreciations and the date the depreciations won't go beyond.")
    prorata = fields.Boolean(string='Prorata Temporis', readonly=True, states={'draft': [('readonly', False)]},
        help='Indicates that the first depreciation entry for this asset have to be done from the asset date (purchase date) instead of the first January / Start date of fiscal year')
    depreciation_line_ids = fields.One2many('account.asset.depreciation.line', 'asset_id', string='Depreciation Lines', readonly=True, states={'draft': [('readonly', False)], 'open': [('readonly', False)]})
    salvage_value = fields.Float(string='Salvage Value', digits=0, readonly=True, states={'draft': [('readonly', False)]},
        help="It is the amount you plan to have that you cannot depreciate.")
    invoice_id = fields.Many2one('account.invoice', string='Invoice', states={'draft': [('readonly', False)]}, copy=False)
    type = fields.Selection(related="category_id.type", string='Type', required=True)
    date_first_depreciation = fields.Selection([
        ('last_day_period', 'Based on Last Day of Purchase Period'),
        ('manual', 'Manual')],
        string='Depreciation Dates', default='manual',
        readonly=True, states={'draft': [('readonly', False)]}, required=True,
        help='The way to compute the date of the first depreciation.\n'
             '  * Based on last day of purchase period: The depreciation dates will be based on the last day of the purchase month or the purchase year (depending on the periodicity of the depreciations).\n'
             '  * Based on purchase date: The depreciation dates will be based on the purchase date.\n')
    first_depreciation_manual_date = fields.Date(
        string='First Depreciation Date',
        readonly=True, states={'draft': [('readonly', False)]},
        help='Note that this date does not alter the computation of the first journal entry in case of prorata temporis assets. It simply changes its accounting date'
    )

    @api.multi
    def unlink(self):
        for asset in self:
            if asset.state in ['open', 'close']:
                raise UserError(_('You cannot delete a document is in %s state.') % (asset.state,))
            for depreciation_line in asset.depreciation_line_ids:
                if depreciation_line.move_id:
                    raise UserError(_('You cannot delete a document that contains posted entries.'))
        return super(AccountAssetAsset, self).unlink()

    @api.model
    def _cron_generate_entries(self):
        self.compute_generated_entries(datetime.today())

    @api.model
    def compute_generated_entries(self, date, asset_type=None):
        # Entries generated : one by grouped category and one by asset from ungrouped category
        created_move_ids = []
        type_domain = []
        if asset_type:
            type_domain = [('type', '=', asset_type)]

        ungrouped_assets = self.env['account.asset.asset'].search(type_domain + [('state', '=', 'open'), ('category_id.group_entries', '=', False)])
        created_move_ids += ungrouped_assets._compute_entries(date, group_entries=False)

        for grouped_category in self.env['account.asset.category'].search(type_domain + [('group_entries', '=', True)]):
            assets = self.env['account.asset.asset'].search([('state', '=', 'open'), ('category_id', '=', grouped_category.id)])
            created_move_ids += assets._compute_entries(date, group_entries=True)
        return created_move_ids

    def _compute_board_amount(self, sequence, residual_amount, amount_to_depr, undone_dotation_number, posted_depreciation_line_ids, total_days, depreciation_date):
        amount = 0
        if sequence == undone_dotation_number:
            amount = residual_amount
        else:
            if self.method == 'linear':
                amount = amount_to_depr / (undone_dotation_number - len(posted_depreciation_line_ids))
                if self.prorata:
                    amount = amount_to_depr / self.method_number
                    if sequence == 1:
                        date = datetime.strptime(self.date, DF)
                        if self.method_period % 12 != 0:
                            month_days = calendar.monthrange(date.year, date.month)[1]
                            days = month_days - date.day + 1
                            amount = (amount_to_depr / self.method_number) / month_days * days
                        else:
                            days = (self.company_id.compute_fiscalyear_dates(date)['date_to'] - date).days + 1
                            amount = (amount_to_depr / self.method_number) / total_days * days
            elif self.method == 'degressive':
                amount = residual_amount * self.method_progress_factor
                if self.prorata:
                    if sequence == 1:
                        date = datetime.strptime(self.date, DF)
                        if self.method_period % 12 != 0:
                            month_days = calendar.monthrange(date.year, date.month)[1]
                            days = month_days - date.day + 1
                            amount = (residual_amount * self.method_progress_factor) / month_days * days
                        else:
                            days = (self.company_id.compute_fiscalyear_dates(date)['date_to'] - date).days + 1
                            amount = (residual_amount * self.method_progress_factor) / total_days * days
        return amount

    def _compute_board_undone_dotation_nb(self, depreciation_date, total_days):
        undone_dotation_number = self.method_number
        if self.method_time == 'end':
            end_date = datetime.strptime(self.method_end, DF).date()
            undone_dotation_number = 0
            while depreciation_date <= end_date:
                depreciation_date = date(depreciation_date.year, depreciation_date.month, depreciation_date.day) + relativedelta(months=+self.method_period)
                undone_dotation_number += 1
        if self.prorata:
            undone_dotation_number += 1
        return undone_dotation_number

    @api.multi
    def compute_depreciation_board(self):
        self.ensure_one()

        posted_depreciation_line_ids = self.depreciation_line_ids.filtered(lambda x: x.move_check).sorted(key=lambda l: l.depreciation_date)
        unposted_depreciation_line_ids = self.depreciation_line_ids.filtered(lambda x: not x.move_check)

        # Remove old unposted depreciation lines. We cannot use unlink() with One2many field
        commands = [(2, line_id.id, False) for line_id in unposted_depreciation_line_ids]

        if self.value_residual != 0.0:
            amount_to_depr = residual_amount = self.value_residual

            # if we already have some previous validated entries, starting date is last entry + method period
            if posted_depreciation_line_ids and posted_depreciation_line_ids[-1].depreciation_date:
                last_depreciation_date = datetime.strptime(posted_depreciation_line_ids[-1].depreciation_date, DF).date()
                depreciation_date = last_depreciation_date + relativedelta(months=+self.method_period)
            else:
                # depreciation_date computed from the purchase date
                depreciation_date = self.date
                depreciation_date = datetime.strptime(depreciation_date, DF)
                if self.date_first_depreciation == 'last_day_period':
                    # depreciation_date = the last day of the month
                    depreciation_date = depreciation_date + relativedelta(day=31)
                    # ... or fiscalyear depending the number of period
                    if self.method_period == 12:
                        depreciation_date = depreciation_date + relativedelta(month=self.company_id.fiscalyear_last_month)
                        depreciation_date = depreciation_date + relativedelta(day=self.company_id.fiscalyear_last_day)
                        if datetime.strftime(depreciation_date, DF) < self.date:
                            depreciation_date = depreciation_date + relativedelta(years=1)
                elif self.first_depreciation_manual_date and self.first_depreciation_manual_date != self.date:
                    # depreciation_date set manually from the 'first_depreciation_manual_date' field
                    depreciation_date = self.first_depreciation_manual_date
                    depreciation_date = datetime.strptime(depreciation_date, DF)

            depreciation_date = depreciation_date.date()
            total_days = (depreciation_date.year % 4) and 365 or 366
            month_day = depreciation_date.day
            undone_dotation_number = self._compute_board_undone_dotation_nb(depreciation_date, total_days)

            for x in range(len(posted_depreciation_line_ids), undone_dotation_number):
                sequence = x + 1
                amount = self._compute_board_amount(sequence, residual_amount, amount_to_depr, undone_dotation_number, posted_depreciation_line_ids, total_days, depreciation_date)
                amount = self.currency_id.round(amount)
                if float_is_zero(amount, precision_rounding=self.currency_id.rounding):
                    continue
                residual_amount -= amount
                vals = {
                    'amount': amount,
                    'asset_id': self.id,
                    'sequence': sequence,
                    'name': (self.code or '') + '/' + str(sequence),
                    'remaining_value': residual_amount,
                    'depreciated_value': self.value - (self.salvage_value + residual_amount),
                    'depreciation_date': depreciation_date.strftime(DF),
                }
                commands.append((0, False, vals))

                depreciation_date = depreciation_date + relativedelta(months=+self.method_period)

                if month_day > 28 and self.date_first_depreciation == 'manual':
                    max_day_in_month = calendar.monthrange(depreciation_date.year, depreciation_date.month)[1]
                    depreciation_date = depreciation_date.replace(day=min(max_day_in_month, month_day))

                # datetime doesn't take into account that the number of days is not the same for each month
                if not self.prorata and self.method_period % 12 != 0 and self.date_first_depreciation == 'last_day_period':
                    max_day_in_month = calendar.monthrange(depreciation_date.year, depreciation_date.month)[1]
                    depreciation_date = depreciation_date.replace(day=max_day_in_month)

        self.write({'depreciation_line_ids': commands})

        return True

    @api.multi
    def validate(self):
        self.write({'state': 'open'})
        fields = [
            'method',
            'method_number',
            'method_period',
            'method_end',
            'method_progress_factor',
            'method_time',
            'salvage_value',
            'invoice_id',
        ]
        ref_tracked_fields = self.env['account.asset.asset'].fields_get(fields)
        for asset in self:
            tracked_fields = ref_tracked_fields.copy()
            if asset.method == 'linear':
                del(tracked_fields['method_progress_factor'])
            if asset.method_time != 'end':
                del(tracked_fields['method_end'])
            else:
                del(tracked_fields['method_number'])
            dummy, tracking_value_ids = asset._message_track(tracked_fields, dict.fromkeys(fields))
            asset.message_post(subject=_('Asset created'), tracking_value_ids=tracking_value_ids)

    def _return_disposal_view(self, move_ids):
        name = _('Disposal Move')
        view_mode = 'form'
        if len(move_ids) > 1:
            name = _('Disposal Moves')
            view_mode = 'tree,form'
        return {
            'name': name,
            'view_type': 'form',
            'view_mode': view_mode,
            'res_model': 'account.move',
            'type': 'ir.actions.act_window',
            'target': 'current',
            'res_id': move_ids[0],
        }

    def _get_disposal_moves(self):
        move_ids = []
        for asset in self:
            unposted_depreciation_line_ids = asset.depreciation_line_ids.filtered(lambda x: not x.move_check)
            if unposted_depreciation_line_ids:
                old_values = {
                    'method_end': asset.method_end,
                    'method_number': asset.method_number,
                }

                # Remove all unposted depr. lines
                commands = [(2, line_id.id, False) for line_id in unposted_depreciation_line_ids]

                # Create a new depr. line with the residual amount and post it
                sequence = len(asset.depreciation_line_ids) - len(unposted_depreciation_line_ids) + 1
                today = datetime.today().strftime(DF)
                vals = {
                    'amount': asset.value_residual,
                    'asset_id': asset.id,
                    'sequence': sequence,
                    'name': (asset.code or '') + '/' + str(sequence),
                    'remaining_value': 0,
                    'depreciated_value': asset.value - asset.salvage_value,  # the asset is completely depreciated
                    'depreciation_date': today,
                }
                commands.append((0, False, vals))
                asset.write({'depreciation_line_ids': commands, 'method_end': today, 'method_number': sequence})
                tracked_fields = self.env['account.asset.asset'].fields_get(['method_number', 'method_end'])
                changes, tracking_value_ids = asset._message_track(tracked_fields, old_values)
                if changes:
                    asset.message_post(subject=_('Asset sold or disposed. Accounting entry awaiting for validation.'), tracking_value_ids=tracking_value_ids)
                move_ids += asset.depreciation_line_ids[-1].create_move(post_move=False)

        return move_ids

    @api.multi
    def set_to_close(self):
        move_ids = self._get_disposal_moves()
        if move_ids:
            self._return_disposal_view(move_ids)

    @api.multi
    def set_to_draft(self):
        self.write({'state': 'draft'})

    @api.one
    @api.depends('value', 'salvage_value', 'depreciation_line_ids.move_check', 'depreciation_line_ids.amount')
    def _amount_residual(self):
        total_amount = 0.0
        for line in self.depreciation_line_ids:
            if line.move_check:
                total_amount += line.amount
        self.value_residual = self.value - total_amount - self.salvage_value

    @api.onchange('company_id')
    def onchange_company_id(self):
        self.currency_id = self.company_id.currency_id.id

    @api.multi
    @api.onchange('date_first_depreciation')
    def onchange_date_first_depreciation(self):
        for record in self:
            if record.date_first_depreciation == 'manual':
                record.first_depreciation_manual_date = record.date

    @api.multi
    @api.depends('depreciation_line_ids.move_id')
    def _entry_count(self):
        for asset in self:
            res = self.env['account.asset.depreciation.line'].search_count([('asset_id', '=', asset.id), ('move_id', '!=', False)])
            asset.entry_count = res or 0

    @api.one
    @api.constrains('prorata', 'method_time')
    def _check_prorata(self):
        if self.prorata and self.method_time != 'number':
            raise ValidationError(_('Prorata temporis can be applied only for time method "number of depreciations".'))

    @api.onchange('category_id')
    def onchange_category_id(self):
        vals = self.onchange_category_id_values(self.category_id.id)
        # We cannot use 'write' on an object that doesn't exist yet
        if vals:
            for k, v in vals['value'].items():
                setattr(self, k, v)

    def onchange_category_id_values(self, category_id):
        if category_id:
            category = self.env['account.asset.category'].browse(category_id)
            return {
                'value': {
                    'method': category.method,
                    'method_number': category.method_number,
                    'method_time': category.method_time,
                    'method_period': category.method_period,
                    'method_progress_factor': category.method_progress_factor,
                    'method_end': category.method_end,
                    'prorata': category.prorata,
                    'date_first_depreciation': category.date_first_depreciation,
                }
            }

    @api.onchange('method_time')
    def onchange_method_time(self):
        if self.method_time != 'number':
            self.prorata = False

    @api.multi
    def copy_data(self, default=None):
        if default is None:
            default = {}
        default['name'] = self.name + _(' (copy)')
        return super(AccountAssetAsset, self).copy_data(default)

    @api.multi
    def _compute_entries(self, date, group_entries=False):
        depreciation_ids = self.env['account.asset.depreciation.line'].search([
            ('asset_id', 'in', self.ids), ('depreciation_date', '<=', date),
            ('move_check', '=', False)])
        if group_entries:
            return depreciation_ids.create_grouped_move()
        return depreciation_ids.create_move()

    @api.model
    def create(self, vals):
        asset = super(AccountAssetAsset, self.with_context(mail_create_nolog=True)).create(vals)
        asset.sudo().compute_depreciation_board()
        return asset

    @api.multi
    def write(self, vals):
        res = super(AccountAssetAsset, self).write(vals)
        if 'depreciation_line_ids' not in vals and 'state' not in vals:
            for rec in self:
                rec.compute_depreciation_board()
        return res

    @api.multi
    def open_entries(self):
        move_ids = []
        for asset in self:
            for depreciation_line in asset.depreciation_line_ids:
                if depreciation_line.move_id:
                    move_ids.append(depreciation_line.move_id.id)
        return {
            'name': _('Journal Entries'),
            'view_type': 'form',
            'view_mode': 'tree,form',
            'res_model': 'account.move',
            'view_id': False,
            'type': 'ir.actions.act_window',
            'domain': [('id', 'in', move_ids)],
        }


class AccountAssetDepreciationLine(models.Model):
    _name = 'account.asset.depreciation.line'
    _description = 'Asset depreciation line'

    name = fields.Char(string='Depreciation Name', required=True, index=True)
    sequence = fields.Integer(required=True)
    asset_id = fields.Many2one('account.asset.asset', string='Asset', required=True, ondelete='cascade')
    parent_state = fields.Selection(related='asset_id.state', string='State of Asset')
    amount = fields.Float(string='Current Depreciation', digits=0, required=True)
    remaining_value = fields.Float(string='Next Period Depreciation', digits=0, required=True)
    depreciated_value = fields.Float(string='Cumulative Depreciation', required=True)
    depreciation_date = fields.Date('Depreciation Date', index=True)
    move_id = fields.Many2one('account.move', string='Depreciation Entry')
    move_check = fields.Boolean(compute='_get_move_check', string='Linked', track_visibility='always', store=True)
    move_posted_check = fields.Boolean(compute='_get_move_posted_check', string='Posted', track_visibility='always', store=True)

    @api.multi
    @api.depends('move_id')
    def _get_move_check(self):
        for line in self:
            line.move_check = bool(line.move_id)

    @api.multi
    @api.depends('move_id.state')
    def _get_move_posted_check(self):
        for line in self:
            line.move_posted_check = True if line.move_id and line.move_id.state == 'posted' else False

    @api.multi
    def create_move(self, post_move=True):
        created_moves = self.env['account.move']
        for line in self:
            if line.move_id:
                raise UserError(_('This depreciation is already linked to a journal entry! Please post or delete it.'))
            move_vals = self._prepare_move(line)
            move = self.env['account.move'].create(move_vals)
            line.write({'move_id': move.id, 'move_check': True})
            created_moves |= move

        if post_move and created_moves:
            created_moves.filtered(lambda m: any(m.asset_depreciation_ids.mapped('asset_id.category_id.open_asset'))).post()
        return [x.id for x in created_moves]

    def _prepare_move(self, line):
        category_id = line.asset_id.category_id
        depreciation_date = self.env.context.get('depreciation_date') or line.depreciation_date or fields.Date.context_today(self)
        company_currency = line.asset_id.company_id.currency_id
        current_currency = line.asset_id.currency_id
        prec = company_currency.decimal_places
        amount = current_currency._convert(
            line.amount, company_currency, line.asset_id.company_id, depreciation_date)
        asset_name = line.asset_id.name + ' (%s/%s)' % (line.sequence, len(line.asset_id.depreciation_line_ids))
        move_line_1 = {
            'name': asset_name,
            'account_id': category_id.account_depreciation_id.id,
            'debit': 0.0 if float_compare(amount, 0.0, precision_digits=prec) > 0 else -amount,
            'credit': amount if float_compare(amount, 0.0, precision_digits=prec) > 0 else 0.0,
            'partner_id': line.asset_id.partner_id.id,
            'analytic_account_id': category_id.account_analytic_id.id if category_id.type == 'sale' else False,
            'currency_id': company_currency != current_currency and current_currency.id or False,
            'amount_currency': company_currency != current_currency and - 1.0 * line.amount or 0.0,
        }
        move_line_2 = {
            'name': asset_name,
            'account_id': category_id.account_depreciation_expense_id.id,
            'credit': 0.0 if float_compare(amount, 0.0, precision_digits=prec) > 0 else -amount,
            'debit': amount if float_compare(amount, 0.0, precision_digits=prec) > 0 else 0.0,
            'partner_id': line.asset_id.partner_id.id,
            'analytic_account_id': category_id.account_analytic_id.id if category_id.type == 'purchase' else False,
            'currency_id': company_currency != current_currency and current_currency.id or False,
            'amount_currency': company_currency != current_currency and line.amount or 0.0,
        }
        move_vals = {
            'ref': line.asset_id.code,
            'date': depreciation_date or False,
            'journal_id': category_id.journal_id.id,
            'line_ids': [(0, 0, move_line_1), (0, 0, move_line_2)],
        }
        return move_vals

    def _prepare_move_grouped(self):
        category_id = self[0].asset_id.category_id  # we can suppose that all lines have the same category
        depreciation_date = self.env.context.get('depreciation_date') or fields.Date.context_today(self)
        amount = 0.0
        for line in self:
            # Sum amount of all depreciation lines
            company_currency = line.asset_id.company_id.currency_id
            current_currency = line.asset_id.currency_id
            company = line.asset_id.company_id
            amount += current_currency._convert(line.amount, company_currency, company, fields.Date.today())

        name = category_id.name + _(' (grouped)')
        move_line_1 = {
            'name': name,
            'account_id': category_id.account_depreciation_id.id,
            'debit': 0.0,
            'credit': amount,
            'journal_id': category_id.journal_id.id,
            'analytic_account_id': category_id.account_analytic_id.id if category_id.type == 'sale' else False,
        }
        move_line_2 = {
            'name': name,
            'account_id': category_id.account_depreciation_expense_id.id,
            'credit': 0.0,
            'debit': amount,
            'journal_id': category_id.journal_id.id,
            'analytic_account_id': category_id.account_analytic_id.id if category_id.type == 'purchase' else False,
        }
        move_vals = {
            'ref': category_id.name,
            'date': depreciation_date or False,
            'journal_id': category_id.journal_id.id,
            'line_ids': [(0, 0, move_line_1), (0, 0, move_line_2)],
        }

        return move_vals

    @api.multi
    def create_grouped_move(self, post_move=True):
        if not self.exists():
            return []

        created_moves = self.env['account.move']
        move = self.env['account.move'].create(self._prepare_move_grouped())
        self.write({'move_id': move.id, 'move_check': True})
        created_moves |= move

        if post_move and created_moves:
            self.post_lines_and_close_asset()
            created_moves.post()
        return [x.id for x in created_moves]

    @api.multi
    def post_lines_and_close_asset(self):
        # we re-evaluate the assets to determine whether we can close them
        for line in self:
            line.log_message_when_posted()
            asset = line.asset_id
            if asset.currency_id.is_zero(asset.value_residual):
                asset.message_post(body=_("Document closed."))
                asset.write({'state': 'close'})

    @api.multi
    def log_message_when_posted(self):
        def _format_message(message_description, tracked_values):
            message = ''
            if message_description:
                message = '<span>%s</span>' % message_description
            for name, values in tracked_values.items():
                message += '<div> &nbsp; &nbsp; &bull; <b>%s</b>: ' % name
                message += '%s</div>' % values
            return message

        for line in self:
            if line.move_id and line.move_id.state == 'draft':
                partner_name = line.asset_id.partner_id.name
                currency_name = line.asset_id.currency_id.name
                msg_values = {_('Currency'): currency_name, _('Amount'): line.amount}
                if partner_name:
                    msg_values[_('Partner')] = partner_name
                msg = _format_message(_('Depreciation line posted.'), msg_values)
                line.asset_id.message_post(body=msg)

    @api.multi
    def unlink(self):
        for record in self:
            if record.move_check:
                if record.asset_id.category_id.type == 'purchase':
                    msg = _("You cannot delete posted depreciation lines.")
                else:
                    msg = _("You cannot delete posted installment lines.")
                raise UserError(msg)
        return super(AccountAssetDepreciationLine, self).unlink()
