# -*- coding: utf-8 -*-
# Copyright 2024-2025 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)

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

_logger = logging.getLogger(__name__)


class ReadyToBillWizard(models.TransientModel):
    """Wizard to collect Proof of Delivery and delivery date before marking as Ready to Bill."""
    _name = 'fusion_claims.ready.to.bill.wizard'
    _description = 'Ready to Bill Wizard'

    # ==========================================================================
    # FIELDS
    # ==========================================================================
    sale_order_id = fields.Many2one(
        'sale.order',
        string='Sale Order',
        required=True,
        readonly=True,
    )
    
    # Delivery Information
    delivery_date = fields.Date(
        string='Delivery Date',
        required=True,
        default=fields.Date.today,
        help='Date the product was delivered to the client',
    )
    
    # Proof of Delivery
    proof_of_delivery = fields.Binary(
        string='Proof of Delivery',
        required=True,
        help='Upload the Proof of Delivery document (PDF)',
    )
    proof_of_delivery_filename = fields.Char(
        string='POD Filename',
    )
    
    # Optional notes
    notes = fields.Text(
        string='Notes',
        help='Optional notes about the delivery',
    )
    
    # Info fields
    has_existing_pod = fields.Boolean(
        string='Has Existing POD',
        compute='_compute_existing_data',
    )
    has_existing_date = fields.Boolean(
        string='Has Existing Date',
        compute='_compute_existing_data',
    )
    existing_pod_filename = fields.Char(
        string='Existing POD Filename',
        compute='_compute_existing_data',
    )
    existing_delivery_date = fields.Date(
        string='Existing Delivery Date',
        compute='_compute_existing_data',
    )
    
    # ==========================================================================
    # COMPUTED METHODS
    # ==========================================================================
    @api.depends('sale_order_id')
    def _compute_existing_data(self):
        for wizard in self:
            order = wizard.sale_order_id
            wizard.has_existing_pod = bool(order.x_fc_proof_of_delivery)
            wizard.has_existing_date = bool(order.x_fc_adp_delivery_date)
            wizard.existing_pod_filename = order.x_fc_proof_of_delivery_filename or ''
            wizard.existing_delivery_date = order.x_fc_adp_delivery_date
    
    # ==========================================================================
    # DEFAULT GET
    # ==========================================================================
    @api.model
    def default_get(self, fields_list):
        res = super().default_get(fields_list)
        
        active_id = self._context.get('active_id')
        if not active_id:
            return res
        
        order = self.env['sale.order'].browse(active_id)
        res['sale_order_id'] = order.id
        
        # Pre-fill delivery date if already set
        if order.x_fc_adp_delivery_date:
            res['delivery_date'] = order.x_fc_adp_delivery_date
        
        # Pre-fill POD if already uploaded
        if order.x_fc_proof_of_delivery:
            res['proof_of_delivery'] = order.x_fc_proof_of_delivery
            res['proof_of_delivery_filename'] = order.x_fc_proof_of_delivery_filename
        
        return res
    
    # ==========================================================================
    # ACTION METHODS
    # ==========================================================================
    def action_mark_ready_to_bill(self):
        """Validate and mark the order as Ready to Bill."""
        self.ensure_one()
        
        order = self.sale_order_id
        
        # Validate status
        if order.x_fc_adp_application_status not in ('approved', 'approved_deduction'):
            raise UserError(
                "Order can only be marked as 'Ready to Bill' from 'Approved' status."
            )
        
        # Validate POD file type
        if self.proof_of_delivery_filename:
            if not self.proof_of_delivery_filename.lower().endswith('.pdf'):
                raise UserError(
                    f"Proof of Delivery must be a PDF file.\n"
                    f"Uploaded: '{self.proof_of_delivery_filename}'"
                )
        
        # Check device verification
        if not order.x_fc_device_verification_complete:
            raise UserError(
                "Device approval verification must be completed before marking as Ready to Bill.\n\n"
                "Please verify which devices were approved by ADP using the 'Mark as Approved' button first."
            )
        
        # Update the order
        order.with_context(skip_status_validation=True).write({
            'x_fc_adp_application_status': 'ready_bill',
            'x_fc_adp_delivery_date': self.delivery_date,
            'x_fc_proof_of_delivery': self.proof_of_delivery,
            'x_fc_proof_of_delivery_filename': self.proof_of_delivery_filename,
        })
        
        # Create attachment for POD to post in chatter
        pod_attachment = self.env['ir.attachment'].create({
            'name': self.proof_of_delivery_filename or 'Proof_of_Delivery.pdf',
            'datas': self.proof_of_delivery,
            'res_model': 'sale.order',
            'res_id': order.id,
        })
        
        # Post to chatter
        from markupsafe import Markup
        
        notes_html = ''
        if self.notes:
            notes_html = f'<p style="margin: 8px 0 0 0;"><strong>Notes:</strong> {self.notes}</p>'
        
        order.message_post(
            body=Markup(
                '<div style="background: #d4edda; border-left: 4px solid #28a745; padding: 12px; margin: 8px 0; border-radius: 4px;">'
                '<h4 style="color: #28a745; margin: 0 0 8px 0;"><i class="fa fa-dollar"/> Ready to Bill</h4>'
                f'<p style="margin: 0;"><strong>Delivery Date:</strong> {self.delivery_date.strftime("%B %d, %Y")}</p>'
                f'<p style="margin: 4px 0 0 0;"><strong>Proof of Delivery:</strong> {self.proof_of_delivery_filename}</p>'
                f'{notes_html}'
                f'<p style="margin: 8px 0 0 0; color: #666; font-size: 0.9em;">Marked by {self.env.user.name}</p>'
                '</div>'
            ),
            message_type='notification',
            subtype_xmlid='mail.mt_note',
            attachment_ids=[pod_attachment.id],
        )
        
        return {
            'type': 'ir.actions.client',
            'tag': 'display_notification',
            'params': {
                'title': _('Ready to Bill'),
                'message': _('Order marked as Ready to Bill. POD attached.'),
                'type': 'success',
                'sticky': False,
                'next': {'type': 'ir.actions.act_window_close'},
            },
        }