Function fetch_article_view_trend

crates/frontend/src/api.rs:651–722

Fetch article view trend points.

(
    id: &str,
    granularity: &str,
    days: Option<usize>,
    day: Option<&str>,
)

/// Fetch article view trend points.
pub async fn fetch_article_view_trend(
    id: &str,
    granularity: &str,
    days: Option<usize>,
    day: Option<&str>,
) -> Result<ArticleViewTrendResponse, String> {
    #[cfg(feature = "mock")]
    {
        if granularity.eq_ignore_ascii_case("hour") {
            return Ok(ArticleViewTrendResponse {
                article_id: id.to_string(),
                timezone: "Asia/Shanghai".to_string(),
                granularity: "hour".to_string(),
                day: Some(day.unwrap_or("2026-02-15").to_string()),
                total_views: 128,
                points: (0..24)
                    .map(|hour| ArticleViewPoint {
                        key: format!("{hour:02}"),
                        views: ((hour * 3 + 5) % 18) as u32,
                    })
                    .collect(),
            });
        }

        let window = days.unwrap_or(30).max(1);
        Ok(ArticleViewTrendResponse {
            article_id: id.to_string(),
            timezone: "Asia/Shanghai".to_string(),
            granularity: "day".to_string(),
            day: None,
            total_views: 128,
            points: (0..window)
                .map(|offset| ArticleViewPoint {
                    key: format!("2026-02-{:02}", offset + 1),
                    views: ((offset * 5 + 9) % 40) as u32,
                })
                .collect(),
        })
    }

    #[cfg(not(feature = "mock"))]
    {
        let mut url = format!(
            "{}/articles/{}/view-trend?granularity={}",
            API_BASE,
            urlencoding::encode(id),
            urlencoding::encode(granularity),
        );
        if let Some(days) = days {
            url.push_str(&format!("&days={days}"));
        }
        if let Some(day) = day {
            url.push_str(&format!("&day={}", urlencoding::encode(day)));
        }

        let response = api_get(&url)
            .header("Cache-Control", "no-cache, no-store, max-age=0")
            .header("Pragma", "no-cache")