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

from lxml import etree
from odoo.tests import TransactionCase


class TestViewConfiguration(TransactionCase):
    """
    Unit tests for view configuration in vendor bill editable totals.
    
    Tests cover:
    - Verify price_subtotal field is editable in vendor bill form (Requirement 1.1)
    - Verify price_total field is editable in vendor bill form (Requirement 2.1)
    - Verify fields are readonly in non-vendor-bill contexts (Requirement 5.2)
    """

    def setUp(self):
        super().setUp()
        
        # Get the view record
        self.view = self.env.ref('vendor_bill_editable_totals.view_move_form_editable_totals')
        
        # Get the base account.move form view
        self.base_view = self.env.ref('account.view_move_form')

    def test_view_exists(self):
        """
        Test that the custom view exists and inherits from the correct base view.
        Requirement 5.2: Use proper view inheritance
        """
        self.assertTrue(self.view, "Custom view should exist")
        self.assertEqual(
            self.view.model,
            'account.move',
            "View should be for account.move model"
        )
        self.assertEqual(
            self.view.inherit_id.id,
            self.base_view.id,
            "View should inherit from account.view_move_form"
        )

    def test_price_subtotal_field_editable(self):
        """
        Test that price_subtotal field is made editable in the view.
        Requirement 1.1: price_subtotal field should be editable in vendor bill form
        """
        # Parse the view architecture
        arch = etree.fromstring(self.view.arch)
        
        # Find the xpath that modifies price_subtotal
        xpath_elements = arch.xpath("//xpath[@expr=\"//field[@name='invoice_line_ids']/tree//field[@name='price_subtotal']\"]")
        
        self.assertTrue(
            len(xpath_elements) > 0,
            "XPath for price_subtotal field should exist in view"
        )
        
        # Check that readonly attribute is set to 0
        xpath_element = xpath_elements[0]
        attributes = xpath_element.xpath(".//attribute[@name='readonly']")
        
        self.assertTrue(
            len(attributes) > 0,
            "Readonly attribute should be set for price_subtotal"
        )
        self.assertEqual(
            attributes[0].text,
            '0',
            "price_subtotal readonly should be set to 0 (editable)"
        )

    def test_price_total_field_editable(self):
        """
        Test that price_total field is made editable in the view.
        Requirement 2.1: price_total field should be editable in vendor bill form
        """
        # Parse the view architecture
        arch = etree.fromstring(self.view.arch)
        
        # Find the xpath that modifies price_total
        xpath_elements = arch.xpath("//xpath[@expr=\"//field[@name='invoice_line_ids']/tree//field[@name='price_total']\"]")
        
        self.assertTrue(
            len(xpath_elements) > 0,
            "XPath for price_total field should exist in view"
        )
        
        # Check that readonly attribute is set to 0
        xpath_element = xpath_elements[0]
        attributes = xpath_element.xpath(".//attribute[@name='readonly']")
        
        self.assertTrue(
            len(attributes) > 0,
            "Readonly attribute should be set for price_total"
        )
        self.assertEqual(
            attributes[0].text,
            '0',
            "price_total readonly should be set to 0 (editable)"
        )

    def test_fields_readonly_when_not_draft(self):
        """
        Test that fields have attrs to make them readonly when state is not draft.
        Requirement 5.2: Fields should be readonly in non-draft states
        """
        # Parse the view architecture
        arch = etree.fromstring(self.view.arch)
        
        # Check price_subtotal attrs
        xpath_subtotal = arch.xpath("//xpath[@expr=\"//field[@name='invoice_line_ids']/tree//field[@name='price_subtotal']\"]")
        self.assertTrue(len(xpath_subtotal) > 0, "price_subtotal xpath should exist")
        
        attrs_subtotal = xpath_subtotal[0].xpath(".//attribute[@name='attrs']")
        self.assertTrue(
            len(attrs_subtotal) > 0,
            "Attrs attribute should be set for price_subtotal to control readonly state"
        )
        
        # Verify the attrs contain readonly condition
        attrs_text = attrs_subtotal[0].text
        self.assertIn(
            'readonly',
            attrs_text,
            "Attrs should contain readonly condition for price_subtotal"
        )
        self.assertIn(
            'draft',
            attrs_text,
            "Attrs should reference draft state for price_subtotal"
        )
        
        # Check price_total attrs
        xpath_total = arch.xpath("//xpath[@expr=\"//field[@name='invoice_line_ids']/tree//field[@name='price_total']\"]")
        self.assertTrue(len(xpath_total) > 0, "price_total xpath should exist")
        
        attrs_total = xpath_total[0].xpath(".//attribute[@name='attrs']")
        self.assertTrue(
            len(attrs_total) > 0,
            "Attrs attribute should be set for price_total to control readonly state"
        )
        
        # Verify the attrs contain readonly condition
        attrs_text = attrs_total[0].text
        self.assertIn(
            'readonly',
            attrs_text,
            "Attrs should contain readonly condition for price_total"
        )
        self.assertIn(
            'draft',
            attrs_text,
            "Attrs should reference draft state for price_total"
        )

    def test_view_applies_to_vendor_bills(self):
        """
        Test that the view modifications apply to vendor bill context.
        Requirement 1.1, 2.1: Fields should be editable in vendor bill form
        """
        # Create a vendor partner
        vendor = self.env['res.partner'].create({
            'name': 'Test Vendor',
            'supplier_rank': 1,
        })
        
        # Create a vendor bill
        vendor_bill = self.env['account.move'].create({
            'move_type': 'in_invoice',
            'partner_id': vendor.id,
            'invoice_date': '2024-01-01',
        })
        
        # Get the view for this record
        view_id = self.env['ir.ui.view'].search([
            ('model', '=', 'account.move'),
            ('type', '=', 'form'),
            ('inherit_id', '=', self.base_view.id),
        ], limit=1)
        
        self.assertTrue(
            view_id,
            "View should be available for vendor bills"
        )

    def test_fields_editable_in_draft_state(self):
        """
        Test that fields are editable when vendor bill is in draft state.
        Requirement 1.1, 2.1: Fields should be editable in draft vendor bills
        """
        # Create a vendor partner
        vendor = self.env['res.partner'].create({
            'name': 'Test Vendor',
            'supplier_rank': 1,
        })
        
        # Create a product
        product = self.env['res.product'].create({
            'name': 'Test Product',
            'type': 'service',
            'list_price': 100.0,
        })
        
        # Create a vendor bill in draft state
        vendor_bill = self.env['account.move'].create({
            'move_type': 'in_invoice',
            'partner_id': vendor.id,
            'invoice_date': '2024-01-01',
            'state': 'draft',
        })
        
        # Create a line
        line = self.env['account.move.line'].create({
            'move_id': vendor_bill.id,
            'product_id': product.id,
            'name': 'Test Line',
            'quantity': 10.0,
            'price_unit': 100.0,
        })
        
        # Verify the bill is in draft state
        self.assertEqual(
            vendor_bill.state,
            'draft',
            "Vendor bill should be in draft state"
        )
        
        # Test that we can modify price_subtotal (this would fail if readonly)
        line.price_subtotal = 1200.0
        line._onchange_price_subtotal()
        
        # If we got here without error, the field is editable
        self.assertAlmostEqual(
            line.price_unit,
            120.0,
            places=2,
            msg="price_unit should be recalculated when price_subtotal is modified"
        )

    def test_fields_readonly_in_posted_state(self):
        """
        Test that fields behavior is appropriate when vendor bill is posted.
        Requirement 5.2: Fields should respect state-based readonly conditions
        
        Note: This test verifies the attrs configuration exists. The actual readonly
        enforcement happens at the UI level based on the attrs domain.
        """
        # Parse the view architecture
        arch = etree.fromstring(self.view.arch)
        
        # Verify both fields have attrs that reference parent.state
        xpath_subtotal = arch.xpath("//xpath[@expr=\"//field[@name='invoice_line_ids']/tree//field[@name='price_subtotal']\"]")
        attrs_subtotal = xpath_subtotal[0].xpath(".//attribute[@name='attrs']")
        attrs_text_subtotal = attrs_subtotal[0].text
        
        # The attrs should make the field readonly when state != 'draft'
        self.assertIn(
            'parent.state',
            attrs_text_subtotal,
            "Attrs should reference parent.state for price_subtotal"
        )
        
        xpath_total = arch.xpath("//xpath[@expr=\"//field[@name='invoice_line_ids']/tree//field[@name='price_total']\"]")
        attrs_total = xpath_total[0].xpath(".//attribute[@name='attrs']")
        attrs_text_total = attrs_total[0].text
        
        self.assertIn(
            'parent.state',
            attrs_text_total,
            "Attrs should reference parent.state for price_total"
        )