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/*
 * parsing/rule/impls/block/blocks/paragraph.rs
 *
 * ftml - Library to parse Wikidot text
 * Copyright (C) 2019-2023 Wikijump Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

use super::prelude::*;
use crate::tree::ContainerType;

pub const BLOCK_PARAGRAPH: BlockRule = BlockRule {
    name: "block-paragraph",
    accepts_names: &["p", "paragraph"],
    accepts_star: false,
    accepts_score: false,
    accepts_newlines: true,
    parse_fn,
};

fn parse_fn<'r, 't>(
    parser: &mut Parser<'r, 't>,
    name: &'t str,
    flag_star: bool,
    flag_score: bool,
    in_head: bool,
) -> ParseResult<'r, 't, Elements<'t>> {
    info!("Parsing paragraph block (name '{name}', in-head {in_head})");
    assert!(!flag_star, "Paragraph doesn't allow star flag");
    assert!(!flag_score, "Paragraph doesn't allow score flag");
    assert_block_name(&BLOCK_PARAGRAPH, name);

    // Gather paragraphs
    let arguments = parser.get_head_map(&BLOCK_PARAGRAPH, in_head)?;
    let attributes = arguments.to_attribute_map(parser.settings());
    let (mut elements, errors, _) =
        parser.get_body_elements(&BLOCK_PARAGRAPH, true)?.into();

    // Apply attributes to each paragraph
    for element in &mut elements {
        if let Element::Container(ref mut container) = element {
            if container.ctype() == ContainerType::Paragraph {
                container.attributes_mut().clone_from(&attributes);
            }
        }
    }

    let element = Elements::Multiple(elements);
    ok!(element, errors)
}