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//! Capabilities for Typst IDE support.

mod analyze;
mod complete;
mod jump;
mod tooltip;

pub use self::analyze::analyze_labels;
pub use self::complete::{autocomplete, Completion, CompletionKind};
pub use self::jump::{jump_from_click, jump_from_cursor, Jump};
pub use self::tooltip::{tooltip, Tooltip};

use std::fmt::Write;

use ecow::{eco_format, EcoString};
use typst::text::{FontInfo, FontStyle};

/// Extract the first sentence of plain text of a piece of documentation.
///
/// Removes Markdown formatting.
fn plain_docs_sentence(docs: &str) -> EcoString {
    let mut s = unscanny::Scanner::new(docs);
    let mut output = EcoString::new();
    let mut link = false;
    while let Some(c) = s.eat() {
        match c {
            '`' => {
                let mut raw = s.eat_until('`');
                if (raw.starts_with('{') && raw.ends_with('}'))
                    || (raw.starts_with('[') && raw.ends_with(']'))
                {
                    raw = &raw[1..raw.len() - 1];
                }

                s.eat();
                output.push('`');
                output.push_str(raw);
                output.push('`');
            }
            '[' => link = true,
            ']' if link => {
                if s.eat_if('(') {
                    s.eat_until(')');
                    s.eat();
                } else if s.eat_if('[') {
                    s.eat_until(']');
                    s.eat();
                }
                link = false
            }
            '*' | '_' => {}
            '.' => {
                output.push('.');
                break;
            }
            _ => output.push(c),
        }
    }

    output
}

/// Create a short description of a font family.
fn summarize_font_family<'a>(variants: impl Iterator<Item = &'a FontInfo>) -> EcoString {
    let mut infos: Vec<_> = variants.collect();
    infos.sort_by_key(|info| info.variant);

    let mut has_italic = false;
    let mut min_weight = u16::MAX;
    let mut max_weight = 0;
    for info in &infos {
        let weight = info.variant.weight.to_number();
        has_italic |= info.variant.style == FontStyle::Italic;
        min_weight = min_weight.min(weight);
        max_weight = min_weight.max(weight);
    }

    let count = infos.len();
    let mut detail = eco_format!("{count} variant{}.", if count == 1 { "" } else { "s" });

    if min_weight == max_weight {
        write!(detail, " Weight {min_weight}.").unwrap();
    } else {
        write!(detail, " Weights {min_weight}–{max_weight}.").unwrap();
    }

    if has_italic {
        detail.push_str(" Has italics.");
    }

    detail
}