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

from psycopg2 import sql
import re

from odoo.addons.http_routing.models.ir_http import slugify
from odoo.addons.website.tools import text_from_html
from odoo import api, fields, models
from odoo.osv import expression
from odoo.tools import escape_psql
from odoo.tools.safe_eval import safe_eval


class Page(models.Model):
    _name = 'website.page'
    _inherits = {'ir.ui.view': 'view_id'}
    _inherit = [
        'website.published.multi.mixin',
        'website.searchable.mixin',
    ]
    _description = 'Page'
    _order = 'website_id'

    url = fields.Char('Page URL')
    view_id = fields.Many2one('ir.ui.view', string='View', required=True, ondelete="cascade")
    website_indexed = fields.Boolean('Is Indexed', default=True)
    date_publish = fields.Datetime('Publishing Date')
    # This is needed to be able to display if page is a menu in /website/pages
    menu_ids = fields.One2many('website.menu', 'page_id', 'Related Menus')
    is_homepage = fields.Boolean(compute='_compute_homepage', inverse='_set_homepage', string='Homepage')
    is_visible = fields.Boolean(compute='_compute_visible', string='Is Visible')

    cache_time = fields.Integer(default=3600, help='Time to cache the page. (0 = no cache)')
    cache_key_expr = fields.Char(help='Expression (tuple) to evaluate the cached key. \nE.g.: "(request.params.get("currency"), )"')

    # Page options
    header_overlay = fields.Boolean()
    header_color = fields.Char()
    header_visible = fields.Boolean(default=True)
    footer_visible = fields.Boolean(default=True)

    # don't use mixin website_id but use website_id on ir.ui.view instead
    website_id = fields.Many2one(related='view_id.website_id', store=True, readonly=False, ondelete='cascade')
    arch = fields.Text(related='view_id.arch', readonly=False, depends_context=('website_id',))

    def _compute_homepage(self):
        for page in self:
            page.is_homepage = page == self.env['website'].get_current_website().homepage_id

    def _set_homepage(self):
        for page in self:
            website = self.env['website'].get_current_website()
            if page.is_homepage:
                if website.homepage_id != page:
                    website.write({'homepage_id': page.id})
            else:
                if website.homepage_id == page:
                    website.write({'homepage_id': None})

    def _compute_visible(self):
        for page in self:
            page.is_visible = page.website_published and (
                not page.date_publish or page.date_publish < fields.Datetime.now()
            )

    def _get_most_specific_pages(self):
        ''' Returns the most specific pages in self. '''
        ids = []
        previous_page = None
        # Iterate a single time on the whole list sorted on specific-website first.
        for page in self.sorted(key=lambda p: (p.url, not p.website_id)):
            if not previous_page or page.url != previous_page.url:
                ids.append(page.id)
            previous_page = page
        return self.filtered(lambda page: page.id in ids)

    def get_page_properties(self):
        self.ensure_one()
        res = self.read([
            'id', 'view_id', 'name', 'url', 'website_published', 'website_indexed', 'date_publish',
            'menu_ids', 'is_homepage', 'website_id', 'visibility', 'groups_id'
        ])[0]
        if not res['groups_id']:
            res['group_id'] = self.env.ref('base.group_user').name_get()[0]
        elif len(res['groups_id']) == 1:
            res['group_id'] = self.env['res.groups'].browse(res['groups_id']).name_get()[0]
        del res['groups_id']

        res['visibility_password'] = res['visibility'] == 'password' and self.visibility_password_display or ''
        return res

    @api.model
    def save_page_info(self, website_id, data):
        website = self.env['website'].browse(website_id)
        page = self.browse(int(data['id']))

        # If URL has been edited, slug it
        original_url = page.url
        url = data['url']
        if not url.startswith('/'):
            url = '/' + url
        if page.url != url:
            url = '/' + slugify(url, max_length=1024, path=True)
            url = self.env['website'].get_unique_path(url)

        # If name has changed, check for key uniqueness
        if page.name != data['name']:
            page_key = self.env['website'].get_unique_key(slugify(data['name']))
        else:
            page_key = page.key

        menu = self.env['website.menu'].search([('page_id', '=', int(data['id']))])
        if not data['is_menu']:
            # If the page is no longer in menu, we should remove its website_menu
            if menu:
                menu.unlink()
        else:
            # The page is now a menu, check if has already one
            if menu:
                menu.write({'url': url})
            else:
                self.env['website.menu'].create({
                    'name': data['name'],
                    'url': url,
                    'page_id': data['id'],
                    'parent_id': website.menu_id.id,
                    'website_id': website.id,
                })

        # Edits via the page manager shouldn't trigger the COW
        # mechanism and generate new pages. The user manages page
        # visibility manually with is_published here.
        w_vals = {
            'key': page_key,
            'name': data['name'],
            'url': url,
            'is_published': data['website_published'],
            'website_indexed': data['website_indexed'],
            'date_publish': data['date_publish'] or None,
            'is_homepage': data['is_homepage'],
            'visibility': data['visibility'],
        }
        if page.visibility == 'restricted_group' and data['visibility'] != "restricted_group":
            w_vals['groups_id'] = False
        elif 'group_id' in data:
            w_vals['groups_id'] = [data['group_id']]
        if 'visibility_pwd' in data:
            w_vals['visibility_password_display'] = data['visibility_pwd'] or ''

        page.with_context(no_cow=True).write(w_vals)

        # Create redirect if needed
        if data['create_redirect']:
            self.env['website.rewrite'].create({
                'name': data['name'],
                'redirect_type': data['redirect_type'],
                'url_from': original_url,
                'url_to': url,
                'website_id': website.id,
            })

        return url

    @api.returns('self', lambda value: value.id)
    def copy(self, default=None):
        if default:
            if not default.get('view_id'):
                view = self.env['ir.ui.view'].browse(self.view_id.id)
                new_view = view.copy({'website_id': default.get('website_id')})
                default['view_id'] = new_view.id

            default['url'] = default.get('url', self.env['website'].get_unique_path(self.url))
        return super(Page, self).copy(default=default)

    @api.model
    def clone_page(self, page_id, page_name=None, clone_menu=True):
        """ Clone a page, given its identifier
            :param page_id : website.page identifier
        """
        page = self.browse(int(page_id))
        copy_param = dict(name=page_name or page.name, website_id=self.env['website'].get_current_website().id)
        if page_name:
            page_url = '/' + slugify(page_name, max_length=1024, path=True)
            copy_param['url'] = self.env['website'].get_unique_path(page_url)

        new_page = page.copy(copy_param)
        # Should not clone menu if the page was cloned from one website to another
        # Eg: Cloning a generic page (no website) will create a page with a website, we can't clone menu (not same container)
        if clone_menu and new_page.website_id == page.website_id:
            menu = self.env['website.menu'].search([('page_id', '=', page_id)], limit=1)
            if menu:
                # If the page being cloned has a menu, clone it too
                menu.copy({'url': new_page.url, 'name': new_page.name, 'page_id': new_page.id})

        return new_page.url + '?enable_editor=1'

    def unlink(self):
        # When a website_page is deleted, the ORM does not delete its
        # ir_ui_view. So we got to delete it ourself, but only if the
        # ir_ui_view is not used by another website_page.
        for page in self:
            # Other pages linked to the ir_ui_view of the page being deleted (will it even be possible?)
            pages_linked_to_iruiview = self.search(
                [('view_id', '=', page.view_id.id), ('id', '!=', page.id)]
            )
            if not pages_linked_to_iruiview and not page.view_id.inherit_children_ids:
                # If there is no other pages linked to that ir_ui_view, we can delete the ir_ui_view
                page.view_id.unlink()
        return super(Page, self).unlink()

    def write(self, vals):
        if 'url' in vals and not vals['url'].startswith('/'):
            vals['url'] = '/' + vals['url']
        self.clear_caches()  # write on page == write on view that invalid cache
        return super(Page, self).write(vals)

    def get_website_meta(self):
        self.ensure_one()
        return self.view_id.get_website_meta()

    @staticmethod
    def _get_cached_blacklist():
        return ('data-snippet="s_website_form"', 'data-no-page-cache=', )

    def _can_be_cached(self, response):
        """ return False if at least one blacklisted's word is present in content """
        blacklist = self._get_cached_blacklist()
        return not any(black in str(response) for black in blacklist)

    def _get_cache_key(self, req):
        # Always call me with super() AT THE END to have cache_key_expr appended as last element
        # It is the only way for end user to not use cache via expr.
        # E.g  (None if 'token' in request.params else 1,)  will bypass cache_time
        cache_key = (req.website.id, req.lang, req.httprequest.path)
        if self.cache_key_expr:  # e.g. (request.session.geoip.get('country_code'),)
            cache_key += safe_eval(self.cache_key_expr, {'request': req})
        return cache_key

    def _get_cache_response(self, cache_key):
        """ Return the cached response corresponding to ``self`` and ``cache_key``.
        Raise a KeyError if the item is not in cache.
        """
        # HACK: we use the same LRU as ormcache to take advantage from its
        # distributed invalidation, but we don't explicitly use ormcache
        return self.pool._Registry__cache[('website.page', _cached_response, self.id, cache_key)]

    def _set_cache_response(self, cache_key, response):
        """ Put in cache the given response. """
        self.pool._Registry__cache[('website.page', _cached_response, self.id, cache_key)] = response

    @api.model
    def _search_get_detail(self, website, order, options):
        with_description = options['displayDescription']
        # Read access on website.page requires sudo.
        requires_sudo = True
        domain = [website.website_domain()]
        if not self.env.user.has_group('website.group_website_designer'):
            # Rule must be reinforced because of sudo.
            domain.append([('website_published', '=', True)])

        search_fields = ['name', 'url']
        fetch_fields = ['id', 'name', 'url']
        mapping = {
            'name': {'name': 'name', 'type': 'text', 'match': True},
            'website_url': {'name': 'url', 'type': 'text'},
        }
        if with_description:
            search_fields.append('arch_db')
            fetch_fields.append('arch')
            mapping['description'] = {'name': 'arch', 'type': 'text', 'html': True, 'match': True}
        return {
            'model': 'website.page',
            'base_domain': domain,
            'requires_sudo': requires_sudo,
            'search_fields': search_fields,
            'fetch_fields': fetch_fields,
            'mapping': mapping,
            'icon': 'fa-file-o',
        }

    @api.model
    def _search_fetch(self, search_detail, search, limit, order):
        with_description = 'description' in search_detail['mapping']
        results, count = super()._search_fetch(search_detail, search, limit, order)
        if with_description and search:
            # Perform search in translations
            # TODO Remove when domains will support xml_translate fields
            query = sql.SQL("""
                SELECT {table}.{id}
                FROM {table}
                LEFT JOIN ir_ui_view v ON {table}.{view_id} = v.{id}
                LEFT JOIN ir_translation t ON v.{id} = t.{res_id}
                WHERE t.lang = {lang}
                AND t.name = ANY({names})
                AND t.type = 'model_terms'
                AND t.value ilike {search}
                LIMIT {limit}
            """).format(
                table=sql.Identifier(self._table),
                id=sql.Identifier('id'),
                view_id=sql.Identifier('view_id'),
                res_id=sql.Identifier('res_id'),
                lang=sql.Placeholder('lang'),
                names=sql.Placeholder('names'),
                search=sql.Placeholder('search'),
                limit=sql.Placeholder('limit'),
            )
            self.env.cr.execute(query, {
                'lang': self.env.lang,
                'names': ['ir.ui.view,arch_db', 'ir.ui.view,name'],
                'search': '%%%s%%' % escape_psql(search),
                'limit': limit,
            })
            ids = {row[0] for row in self.env.cr.fetchall()}
            ids.update(results.ids)
            domains = search_detail['base_domain'].copy()
            domains.append([('id', 'in', list(ids))])
            domain = expression.AND(domains)
            model = self.sudo() if search_detail.get('requires_sudo') else self
            results = model.search(
                domain,
                limit=limit,
                order=search_detail.get('order', order)
            )
            count = max(count, len(results))

        def filter_page(search, page, all_pages):
            # Search might have matched words in the xml tags and parameters therefore we make
            # sure the terms actually appear inside the text.
            text = '%s %s %s' % (page.name, page.url, text_from_html(page.arch))
            pattern = '|'.join([re.escape(search_term) for search_term in search.split()])
            return re.findall('(%s)' % pattern, text, flags=re.I) if pattern else False
        if 'url' not in order:
            results = results._get_most_specific_pages()
        if search and with_description:
            results = results.filtered(lambda result: filter_page(search, result, results))
        return results, count


# this is just a dummy function to be used as ormcache key
def _cached_response():
    pass