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

from odoo import api, fields, models, _
from odoo.tools import ustr
from odoo.exceptions import UserError

# ---------------------------------------------------------
# Budgets
# ---------------------------------------------------------
class AccountBudgetPost(models.Model):
    _name = "account.budget.post"
    _order = "name"
    _description = "Budgetary Position"

    name = fields.Char('Name', required=True)
    account_ids = fields.Many2many('account.account', 'account_budget_rel', 'budget_id', 'account_id', 'Accounts',
        domain=[('deprecated', '=', False)])
    crossovered_budget_line = fields.One2many('crossovered.budget.lines', 'general_budget_id', 'Budget Lines')
    company_id = fields.Many2one('res.company', 'Company', required=True,
        default=lambda self: self.env['res.company']._company_default_get('account.budget.post'))


class CrossoveredBudget(models.Model):
    _name = "crossovered.budget"
    _description = "Budget"
    _inherit = ['mail.thread']

    name = fields.Char('Budget Name', required=True, states={'done': [('readonly', True)]})
    creating_user_id = fields.Many2one('res.users', 'Responsible', default=lambda self: self.env.user)
    date_from = fields.Date('Start Date', required=True, states={'done': [('readonly', True)]})
    date_to = fields.Date('End Date', required=True, states={'done': [('readonly', True)]})
    state = fields.Selection([
        ('draft', 'Draft'),
        ('cancel', 'Cancelled'),
        ('confirm', 'Confirmed'),
        ('validate', 'Validated'),
        ('done', 'Done')
        ], 'Status', default='draft', index=True, required=True, readonly=True, copy=False, track_visibility='always')
    crossovered_budget_line = fields.One2many('crossovered.budget.lines', 'crossovered_budget_id', 'Budget Lines',
        states={'done': [('readonly', True)]}, copy=True)
    company_id = fields.Many2one('res.company', 'Company', required=True,
        default=lambda self: self.env['res.company']._company_default_get('account.budget.post'))

    @api.multi
    def action_budget_confirm(self):
        self.write({'state': 'confirm'})

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

    @api.multi
    def action_budget_validate(self):
        self.write({'state': 'validate'})

    @api.multi
    def action_budget_cancel(self):
        self.write({'state': 'cancel'})

    @api.multi
    def action_budget_done(self):
        self.write({'state': 'done'})


class CrossoveredBudgetLines(models.Model):
    _name = "crossovered.budget.lines"
    _description = "Budget Line"

    crossovered_budget_id = fields.Many2one('crossovered.budget', 'Budget', ondelete='cascade', index=True, required=True)
    analytic_account_id = fields.Many2one('account.analytic.account', 'Analytic Account')
    general_budget_id = fields.Many2one('account.budget.post', 'Budgetary Position', required=True)
    date_from = fields.Date('Start Date', required=True)
    date_to = fields.Date('End Date', required=True)
    paid_date = fields.Date('Paid Date')
    planned_amount = fields.Float('Planned Amount', required=True, digits=0)
    practical_amount = fields.Float(compute='_compute_practical_amount', string='Practical Amount', digits=0)
    theoritical_amount = fields.Float(compute='_compute_theoritical_amount', string='Theoretical Amount', digits=0)
    percentage = fields.Float(compute='_compute_percentage', string='Achievement')
    company_id = fields.Many2one(related='crossovered_budget_id.company_id', comodel_name='res.company',
        string='Company', store=True, readonly=True)

    @api.multi
    def _compute_practical_amount(self):
        for line in self:
            result = 0.0
            acc_ids = line.general_budget_id.account_ids.ids
            if not acc_ids:
                raise UserError(_("The Budget '%s' has no accounts!") % ustr(line.general_budget_id.name))
            date_to = self.env.context.get('wizard_date_to') or line.date_to
            date_from = self.env.context.get('wizard_date_from') or line.date_from
            if line.analytic_account_id.id:
                self.env.cr.execute("""
                    SELECT SUM(amount)
                    FROM account_analytic_line
                    WHERE account_id=%s
                        AND (date between to_date(%s,'yyyy-mm-dd') AND to_date(%s,'yyyy-mm-dd'))
                        AND general_account_id=ANY(%s)""",
                (line.analytic_account_id.id, date_from, date_to, acc_ids,))
                result = self.env.cr.fetchone()[0] or 0.0
            line.practical_amount = result

    @api.multi
    def _compute_theoritical_amount(self):
        today = fields.Datetime.now()
        for line in self:
            # Used for the report

            if self.env.context.get('wizard_date_from') and self.env.context.get('wizard_date_to'):
                date_from = fields.Datetime.from_string(self.env.context.get('wizard_date_from'))
                date_to = fields.Datetime.from_string(self.env.context.get('wizard_date_to'))
                if date_from < fields.Datetime.from_string(line.date_from):
                    date_from = fields.Datetime.from_string(line.date_from)
                elif date_from > fields.Datetime.from_string(line.date_to):
                    date_from = False

                if date_to > fields.Datetime.from_string(line.date_to):
                    date_to = fields.Datetime.from_string(line.date_to)
                elif date_to < fields.Datetime.from_string(line.date_from):
                    date_to = False

                theo_amt = 0.00
                if date_from and date_to:
                    line_timedelta = fields.Datetime.from_string(line.date_to) - fields.Datetime.from_string(line.date_from)
                    elapsed_timedelta = date_to - date_from
                    if elapsed_timedelta.days > 0:
                        theo_amt = (elapsed_timedelta.total_seconds() / line_timedelta.total_seconds()) * line.planned_amount
            else:
                if line.paid_date:
                    if fields.Datetime.from_string(line.date_to) <= fields.Datetime.from_string(line.paid_date):
                        theo_amt = 0.00
                    else:
                        theo_amt = line.planned_amount
                else:
                    line_timedelta = fields.Datetime.from_string(line.date_to) - fields.Datetime.from_string(line.date_from)
                    elapsed_timedelta = fields.Datetime.from_string(today) - (fields.Datetime.from_string(line.date_from))

                    if elapsed_timedelta.days < 0:
                        # If the budget line has not started yet, theoretical amount should be zero
                        theo_amt = 0.00
                    elif line_timedelta.days > 0 and fields.Datetime.from_string(today) < fields.Datetime.from_string(line.date_to):
                        # If today is between the budget line date_from and date_to
                        theo_amt = (elapsed_timedelta.total_seconds() / line_timedelta.total_seconds()) * line.planned_amount
                    else:
                        theo_amt = line.planned_amount

            line.theoritical_amount = theo_amt

    @api.multi
    def _compute_percentage(self):
        for line in self:
            if line.theoritical_amount != 0.00:
                line.percentage = float((line.practical_amount or 0.0) / line.theoritical_amount) * 100
            else:
                line.percentage = 0.00