# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)

import base64
import logging
from datetime import timedelta
from odoo import models, fields, api, _
from odoo.exceptions import UserError

_logger = logging.getLogger(__name__)


class FusionClockReport(models.Model):
    _name = 'fusion.clock.report'
    _description = 'Clock Period Report'
    _order = 'date_end desc, employee_id'
    _rec_name = 'name'

    name = fields.Char(
        string='Report Name',
        compute='_compute_name',
        store=True,
    )
    date_start = fields.Date(string='Period Start', required=True, index=True)
    date_end = fields.Date(string='Period End', required=True, index=True)
    schedule_type = fields.Selection(
        [
            ('weekly', 'Weekly'),
            ('biweekly', 'Bi-Weekly'),
            ('semi_monthly', 'Semi-Monthly'),
            ('monthly', 'Monthly'),
        ],
        string='Schedule Type',
    )
    state = fields.Selection(
        [
            ('draft', 'Draft'),
            ('generated', 'Generated'),
            ('sent', 'Sent'),
        ],
        string='Status',
        default='draft',
        index=True,
    )
    employee_id = fields.Many2one(
        'hr.employee',
        string='Employee',
        index=True,
        help="Empty = batch report for all employees.",
    )
    is_batch = fields.Boolean(
        string='Batch Report',
        compute='_compute_is_batch',
        store=True,
    )
    company_id = fields.Many2one(
        'res.company',
        string='Company',
        default=lambda self: self.env.company,
        required=True,
    )

    # Computed totals
    total_hours = fields.Float(string='Total Worked Hours', compute='_compute_totals', store=True)
    net_hours = fields.Float(string='Net Hours', compute='_compute_totals', store=True)
    total_breaks = fields.Float(string='Total Breaks (min)', compute='_compute_totals', store=True)
    total_penalties = fields.Integer(string='Penalty Count', compute='_compute_totals', store=True)
    days_worked = fields.Integer(string='Days Worked', compute='_compute_totals', store=True)
    attendance_ids = fields.Many2many(
        'hr.attendance',
        'fusion_clock_report_attendance_rel',
        'report_id',
        'attendance_id',
        string='Attendance Records',
    )

    # PDF
    report_pdf = fields.Binary(string='Report PDF', attachment=True)
    report_pdf_filename = fields.Char(string='PDF Filename')

    @api.depends('employee_id', 'date_start', 'date_end')
    def _compute_name(self):
        for rec in self:
            if rec.employee_id:
                rec.name = f"{rec.employee_id.name} - {rec.date_start} to {rec.date_end}"
            else:
                rec.name = f"Batch Report - {rec.date_start} to {rec.date_end}"

    @api.depends('employee_id')
    def _compute_is_batch(self):
        for rec in self:
            rec.is_batch = not bool(rec.employee_id)

    @api.depends('attendance_ids', 'attendance_ids.worked_hours',
                 'attendance_ids.x_fclk_net_hours', 'attendance_ids.x_fclk_break_minutes')
    def _compute_totals(self):
        for rec in self:
            atts = rec.attendance_ids
            rec.total_hours = sum(a.worked_hours or 0.0 for a in atts)
            rec.net_hours = sum(a.x_fclk_net_hours or 0.0 for a in atts)
            rec.total_breaks = sum(a.x_fclk_break_minutes or 0.0 for a in atts)
            rec.total_penalties = self.env['fusion.clock.penalty'].search_count([
                ('employee_id', '=', rec.employee_id.id),
                ('date', '>=', rec.date_start),
                ('date', '<=', rec.date_end),
            ]) if rec.employee_id else 0
            # Count unique dates
            dates = set()
            for a in atts:
                if a.check_in:
                    dates.add(a.check_in.date())
            rec.days_worked = len(dates)

    def action_generate_report(self):
        """Generate the PDF report for this record."""
        self.ensure_one()
        self._collect_attendance_records()
        self._generate_pdf()
        self.state = 'generated'

    def action_send_report(self):
        """Send the report via email."""
        self.ensure_one()
        if self.state != 'generated':
            raise UserError(_("Please generate the report first."))
        self._send_report_email()
        self.state = 'sent'

    def _collect_attendance_records(self):
        """Link attendance records for the period and employee."""
        self.ensure_one()
        domain = [
            ('check_in', '>=', fields.Datetime.to_datetime(self.date_start)),
            ('check_in', '<', fields.Datetime.to_datetime(self.date_end + timedelta(days=1))),
            ('check_out', '!=', False),
        ]
        if self.employee_id:
            domain.append(('employee_id', '=', self.employee_id.id))
        else:
            domain.append(('employee_id.company_id', '=', self.company_id.id))

        attendances = self.env['hr.attendance'].search(domain)
        self.attendance_ids = [(6, 0, attendances.ids)]

    def _generate_pdf(self):
        """Render the QWeb report to PDF and store it."""
        self.ensure_one()
        if self.employee_id:
            report_ref = 'fusion_clock.action_report_clock_employee'
        else:
            report_ref = 'fusion_clock.action_report_clock_batch'

        report = self.env['ir.actions.report']._get_report_from_name(report_ref)
        if not report:
            # Fallback to employee report
            report_ref = 'fusion_clock.action_report_clock_employee'

        pdf_content, _ = self.env['ir.actions.report']._render_qweb_pdf(
            report_ref, [self.id]
        )
        filename = f"clock_report_{self.date_start}_{self.date_end}"
        if self.employee_id:
            filename += f"_{self.employee_id.name.replace(' ', '_')}"
        filename += ".pdf"

        self.write({
            'report_pdf': base64.b64encode(pdf_content),
            'report_pdf_filename': filename,
        })

    def _send_report_email(self):
        """Send the report via mail template."""
        self.ensure_one()
        if self.employee_id:
            template = self.env.ref('fusion_clock.mail_template_clock_employee_report', raise_if_not_found=False)
        else:
            template = self.env.ref('fusion_clock.mail_template_clock_batch_report', raise_if_not_found=False)

        if template:
            template.send_mail(self.id, force_send=True)
        else:
            _logger.warning("Fusion Clock: Mail template not found for report %s", self.id)

    @api.model
    def _cron_generate_period_reports(self):
        """Cron: Generate reports when a pay period ends."""
        ICP = self.env['ir.config_parameter'].sudo()
        auto_generate = ICP.get_param('fusion_clock.auto_generate_reports', 'True')
        if auto_generate != 'True':
            return

        schedule_type = ICP.get_param('fusion_clock.pay_period_type', 'biweekly')
        period_start_str = ICP.get_param('fusion_clock.pay_period_start', '')

        today = fields.Date.today()
        period_start, period_end = self._calculate_current_period(schedule_type, period_start_str, today)

        # Only generate if yesterday was the end of a period
        if period_end != today - timedelta(days=1):
            return

        _logger.info("Fusion Clock: Generating reports for period %s to %s", period_start, period_end)

        companies = self.env['res.company'].search([])
        for company in companies:
            employees = self.env['hr.employee'].search([
                ('company_id', '=', company.id),
                ('x_fclk_enable_clock', '=', True),
            ])

            # Generate individual reports
            for employee in employees:
                existing = self.search([
                    ('employee_id', '=', employee.id),
                    ('date_start', '=', period_start),
                    ('date_end', '=', period_end),
                ], limit=1)
                if not existing:
                    report = self.create({
                        'date_start': period_start,
                        'date_end': period_end,
                        'schedule_type': schedule_type,
                        'employee_id': employee.id,
                        'company_id': company.id,
                    })
                    try:
                        report.action_generate_report()
                        # Auto-send if configured
                        send_employee = ICP.get_param('fusion_clock.send_employee_reports', 'True')
                        if send_employee == 'True':
                            report.action_send_report()
                    except Exception as e:
                        _logger.error("Fusion Clock: Error generating report for %s: %s", employee.name, e)

            # Generate batch report
            existing_batch = self.search([
                ('employee_id', '=', False),
                ('date_start', '=', period_start),
                ('date_end', '=', period_end),
                ('company_id', '=', company.id),
            ], limit=1)
            if not existing_batch:
                batch = self.create({
                    'date_start': period_start,
                    'date_end': period_end,
                    'schedule_type': schedule_type,
                    'employee_id': False,
                    'company_id': company.id,
                })
                try:
                    batch.action_generate_report()
                    batch.action_send_report()
                except Exception as e:
                    _logger.error("Fusion Clock: Error generating batch report: %s", e)

    @api.model
    def _calculate_current_period(self, schedule_type, period_start_str, reference_date):
        """Calculate the period start/end dates based on schedule type."""
        from dateutil.relativedelta import relativedelta
        import datetime

        if period_start_str:
            try:
                anchor = fields.Date.from_string(period_start_str)
            except Exception:
                anchor = reference_date.replace(day=1)
        else:
            anchor = reference_date.replace(day=1)

        if schedule_type == 'weekly':
            days_diff = (reference_date - anchor).days
            period_num = days_diff // 7
            period_start = anchor + timedelta(days=period_num * 7)
            period_end = period_start + timedelta(days=6)

        elif schedule_type == 'biweekly':
            days_diff = (reference_date - anchor).days
            period_num = days_diff // 14
            period_start = anchor + timedelta(days=period_num * 14)
            period_end = period_start + timedelta(days=13)

        elif schedule_type == 'semi_monthly':
            if reference_date.day <= 15:
                period_start = reference_date.replace(day=1)
                period_end = reference_date.replace(day=15)
            else:
                period_start = reference_date.replace(day=16)
                # Last day of month
                next_month = reference_date.replace(day=28) + timedelta(days=4)
                period_end = next_month - timedelta(days=next_month.day)

        elif schedule_type == 'monthly':
            period_start = reference_date.replace(day=1)
            next_month = reference_date.replace(day=28) + timedelta(days=4)
            period_end = next_month - timedelta(days=next_month.day)

        else:
            # Default biweekly
            days_diff = (reference_date - anchor).days
            period_num = days_diff // 14
            period_start = anchor + timedelta(days=period_num * 14)
            period_end = period_start + timedelta(days=13)

        return period_start, period_end