//! Application metadata commands.
//!
//! Exposes static, app-level information to the frontend. The changelog is
//! embedded at compile time via `include_str!` so the "What's New" dialog can
//! surface release notes after an OTA update without shipping a separate
//! resource file or reading from disk at runtime.

use tracing::instrument;

/// The project changelog, baked into the binary at build time.
const CHANGELOG: &str = include_str!("../../../CHANGELOG.md");

/// Parse a free-text date ("tomorrow", "friday 3pm", "dec 25", ISO) into a
/// local `YYYY-MM-DDTHH:MM` string, or `None` if unrecognized.
///
/// This is the single source of truth for date-field parsing; the frontend
/// calls it instead of duplicating the grammar in JavaScript. Resolution is
/// relative to the machine's local wall-clock time.
#[tauri::command]
#[instrument]
pub async fn parse_natural_date(input: String) -> Option<String> {
    let now = chrono::Local::now().naive_local();
    goingson_core::parse_natural_date(&input, now)
        .map(|dt| dt.format("%Y-%m-%dT%H:%M").to_string())
}

/// Return the raw `CHANGELOG.md` contents.
///
/// The frontend parses out the section for the freshly-installed version and
/// renders it in the "What's New" dialog. Infallible — the changelog is part
/// of the binary.
#[tauri::command]
#[instrument]
pub async fn get_changelog() -> String {
    CHANGELOG.to_string()
}