//! Rendering for `sm121 report`: the Markdown table (stdout mode) and the
//! embedded HTML page (serve mode), over the collected [`ReportRow`]s.

use super::provenance;
use super::{PAGE_TEMPLATE, PerfCell, ReportEntry, ReportRow};

pub(crate) fn latest_score(r: &ReportRow) -> Option<&ReportEntry> {
    r.reports
        .iter()
        .rev()
        .find(|e| e.pct.is_some() || e.points.is_some())
}

pub(crate) fn latest_perf(r: &ReportRow) -> Option<(&PerfCell, Option<&PerfCell>)> {
    r.reports.iter().rev().find_map(|e| {
        let c1 = e.perf.iter().find(|p| p.d == 0 && p.c == 1);
        c1.map(|c1| (c1, e.perf.iter().find(|p| p.d == 0 && p.c == 2)))
    })
}

/// Normalized score, whole numbers without decimals (81, not 81.0).
pub(crate) fn fmt_pct(pct: f64) -> String {
    if (pct - pct.trunc()).abs() < 1e-9 {
        format!("{}", pct as i64)
    } else {
        format!("{pct:.1}")
    }
}

pub(crate) fn fmt_tps(c: Option<&PerfCell>) -> String {
    c.map(|c| format!("{:.1}", c.tg))
        .unwrap_or_else(|| "—".into())
}

pub(crate) fn markdown(rows: &[ReportRow]) -> String {
    let mut s = format!(
        "# {}\n\n",
        fluent_i18n::t!("report-title", { "count" => rows.len() })
    );
    s.push_str(&format!(
        "| {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} |\n",
        t("report-col-model"),
        t("report-col-quant"),
        t("report-col-recipe"),
        t("report-col-prov"),
        t("report-col-engine"),
        t("report-col-nodes"),
        t("report-col-reports"),
        t("report-col-last"),
        t("report-col-up"),
        t("report-col-launches"),
        t("report-col-points"),
        t("report-col-score"),
        t("report-col-tps1"),
        t("report-col-tps2"),
    ));
    s.push_str("|---|---|---|---|---|---|---|---|---|---|---|---|\n");
    for r in rows {
        let last = r.reports.last();
        let latest = latest_score(r);
        let perf = latest_perf(r);
        s.push_str(&format!(
            "| {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} |\n",
            r.model,
            r.quant,
            r.name,
            provenance::cell(r),
            r.engine,
            r.nodes
                .map(|n| format!("{n}×{}", r.tp))
                .unwrap_or_else(|| format!("1×{}", r.tp)),
            r.reports.len(),
            last.map(|e| match &e.time {
                Some(t) => format!("{} {t}", e.date),
                None => e.date.clone(),
            })
            .unwrap_or("—".into()),
            r.up.map(|u| format!("● {}", crate::stamp::fmt_ts(u)))
                .unwrap_or_else(|| "—".into()),
            r.runs,
            latest
                .and_then(|e| e.points.clone())
                .unwrap_or_else(|| "—".into()),
            latest
                .and_then(|e| e.pct)
                .map(fmt_pct)
                .unwrap_or_else(|| "—".into()),
            fmt_tps(perf.map(|(a, _)| a)),
            fmt_tps(perf.and_then(|(_, b)| b)),
        ));
    }
    s
}

pub(crate) fn t(key: &str) -> String {
    fluent_i18n::t!(key)
}

/// The interactive page: template with `{{DATA}}` replaced by the JSON
/// rows (`<` escaped so `</script>` in data can't break out).
pub(crate) fn html_page(rows: &[ReportRow]) -> String {
    let json = serde_json::to_string(rows).unwrap_or_else(|_| "[]".into());
    PAGE_TEMPLATE.replace("{{DATA}}", &json.replace('<', "\\u003c"))
}

/// Same page mounted under a URL prefix — the dashboard nests it at
/// `/recipes`, so the page's own absolute paths (its SSE stream and the
/// `/r/<recipe>/<file>` viewer links) have to move with it.
pub(crate) fn html_page_at(rows: &[ReportRow], prefix: &str) -> String {
    let page = html_page(rows);
    if prefix.is_empty() {
        return page;
    }
    page.replace("/events", &format!("{prefix}/events"))
        .replace("/r/", &format!("{prefix}/r/"))
        // marks the page as hosted (dashboard window): no own branding, and
        // the live chip only warns on a broken stream
        .replacen("<body>", "<body class=\"embed\">", 1)
}