cmd-usage 0.6.1

use crate::render::{color_for, BOLD, compact, CYAN, DIM, money, RESET};

pub fn bar(pct: f64, width: usize, ascii: bool, colors: bool) -> String {
    let filled = ((pct / 100.0).clamp(0.0, 1.0) * width as f64).round() as usize;
    let (full, empty) = if ascii { ("#", "-") } else { ("━", "╱") };
    if !colors {
        return format!("{pct:>5.1}% {}{}", full.repeat(filled), empty.repeat(width - filled));
    }
    let color = color_for(pct);
    format!(
        "{color}{pct:>5.1}%{} {}{}{}",
        RESET,
        full.repeat(filled),
        DIM,
        empty.repeat(width - filled)
    )
}

fn pct_of(w: &Option<(f64, f64)>) -> f64 {
    match w {
        Some((u, c)) if *c > 0.0 => u / c * 100.0,
        _ => 0.0,
    }
}

/// What a statusline can show. Fields map 1:1 to template placeholders.
pub struct StatusData<'a> {
    pub plan: &'a str,
    pub monthly_remaining: f64,
    pub monthly_cap: f64,
    pub five_hour: &'a Option<(f64, f64)>,
    pub weekly: &'a Option<(f64, f64)>,
    /// Pre-rendered "on pace to hit cap in …" text, if a pace warning applies.
    pub five_hour_eta: Option<String>,
    pub weekly_eta: Option<String>,
    pub bar_width: usize,
    pub colors: bool,
    pub ascii: bool,
}

/// Template placeholders (case-insensitive):
///   {plan}          plan name
///   {credits}       remaining monthly credits ($x.xx)
///   {cap}           monthly cap ($x.xx)
///   {credits_bar}   monthly usage bar (used%)
///   {5h_bar}        5-hour window bar
///   {5h_pct}        5-hour used %
///   {5h_used} {5h_cap}
///   {5h_eta}        5-hour pace ETA ("on pace to hit cap in 2h 3m") or empty
///   {wk_bar}        weekly bar
///   {wk_pct} {wk_used} {wk_cap}
///   {wk_eta}        weekly pace ETA or empty
///   | or newline    segment separators
/// Unknown placeholders are dropped. Plain text passes through.
pub fn render_statusline(tpl: &str, d: &StatusData) -> String {
    let mut out = String::new();
    let mut rest = tpl;
    while let Some(start) = rest.find('{') {
        out.push_str(&rest[..start]);
        let after = &rest[start + 1..];
        match after.find('}') {
            Some(end) => {
                let key = after[..end].to_lowercase();
                out.push_str(&placeholder(&key, d));
                rest = &after[end + 1..];
            }
            None => {
                // no closing brace: emit rest verbatim
                out.push('{');
                out.push_str(after);
                rest = "";
            }
        }
    }
    out.push_str(rest);
    out
}

fn placeholder(key: &str, d: &StatusData) -> String {
    let bar = |p: f64| bar(p, d.bar_width, d.ascii, d.colors);
    match key {
        "plan" => d.plan.to_string(),
        "credits" => {
            if d.colors {
                format!("{CYAN}{}{RESET}", money(d.monthly_remaining))
            } else {
                money(d.monthly_remaining)
            }
        }
        "cap" => money(d.monthly_cap),
        "credits_bar" => {
            let pct = if d.monthly_cap > 0.0 {
                (d.monthly_cap - d.monthly_remaining) / d.monthly_cap * 100.0
            } else {
                0.0
            };
            bar(pct)
        }
        "5h_bar" => bar(pct_of(d.five_hour)),
        "5h_pct" => format!("{:.0}%", pct_of(d.five_hour)),
        "5h_used" => money(d.five_hour.map(|(u, _)| u).unwrap_or(0.0)),
        "5h_cap" => money(d.five_hour.map(|(_, c)| c).unwrap_or(0.0)),
        "5h_eta" => d.five_hour_eta.clone().unwrap_or_default(),
        "wk_bar" => bar(pct_of(d.weekly)),
        "wk_pct" => format!("{:.0}%", pct_of(d.weekly)),
        "wk_used" => money(d.weekly.map(|(u, _)| u).unwrap_or(0.0)),
        "wk_cap" => money(d.weekly.map(|(_, c)| c).unwrap_or(0.0)),
        "wk_eta" => d.weekly_eta.clone().unwrap_or_default(),
        _ => String::new(),
    }
}

// ---- tables ----

fn totals_json(t: &crate::reports::Totals) -> serde_json::Value {
    serde_json::json!({
        "requests": t.requests,
        "tokensIn": t.usage.input_tokens,
        "tokensOut": t.usage.output_tokens,
        "cacheRead": t.usage.cache_read_tokens,
        "cacheWrite": t.usage.cache_write_tokens,
        "costUsd": t.usage.cost_usd,
    })
}

/// serde_json Map from sorted (key, Totals) pairs — keys are escaped.
fn totals_map<'a, I>(items: I) -> serde_json::Map<String, serde_json::Value>
where
    I: Iterator<Item = (&'a String, &'a crate::reports::Totals)>,
{
    items
        .map(|(k, t)| (k.clone(), totals_json(t)))
        .collect()
}

fn table_header() -> String {
    format!(
        " {BOLD}{:<12}{RESET} {:>6} {:>10} {:>10} {:>10} {:>10}\n",
        "Day", "Reqs", "In", "Out", "Cache rd", "Cost"
    )
}

fn table_row(day: &str, t: &crate::reports::Totals, dim: bool) -> String {
    let (d_open, d_close): (&str, &str) = if dim { (DIM, RESET) } else { ("", "") };
    format!(
        " {d_open}{:<12}{d_close} {:>6} {:>10} {:>10} {:>10} {:>10}\n",
        day,
        compact(t.requests),
        compact(t.usage.input_tokens),
        compact(t.usage.output_tokens),
        compact(t.usage.cache_read_tokens),
        money(t.usage.cost_usd),
    )
}

/// Daily usage table (local or account scope). JSON key and heading differ.
pub fn table(scope: &str, subtitle: &str, by_day: &crate::reports::ByDay, total: &crate::reports::Totals, days: Option<usize>, json: bool) -> String {
    if json {
        return serde_json::json!({
            "scope": scope,
            "total": totals_json(total),
            "days": totals_map(by_day.iter()),
        })
        .to_string();
    }
    let mut o = format!(
        "{BOLD}{}{RESET} {DIM}({subtitle}){RESET}\n\n",
        if scope == "account" { "Account usage" } else { "Local usage" }
    );
    o.push_str(&table_header());
    let day_count = by_day.len();
    let last_n = days.unwrap_or(usize::MAX);
    for (day, t) in by_day.iter().skip(day_count.saturating_sub(last_n)) {
        o.push_str(&table_row(day, t, false));
    }
    o.push_str(&table_row("total", total, true));
    o
}

/// Hourly account usage table
pub fn hourly_table(rows: &[(String, crate::reports::Totals)], json: bool, source: &str) -> String {
    if json {
        return serde_json::json!({
            "scope": "hourly",
            "source": source.replace(' ', "-"),
            "hours": totals_map(rows.iter().map(|(h, t)| (h, t))),
        })
        .to_string();
    }
    let mut o = format!(
        "{BOLD}Usage by hour{RESET} {DIM}({source}){RESET}\n\n"
    );
    o.push_str(&format!(
        " {BOLD}{:<14}{RESET} {:>6} {:>10} {:>10} {:>10}\n",
        "Hour", "Reqs", "In", "Out", "Cost"
    ));
    for (h, t) in rows {
        o.push_str(&format!(
            " {:<14} {:>6} {:>10} {:>10} {:>10}\n",
            h,
            compact(t.requests),
            compact(t.usage.input_tokens),
            compact(t.usage.output_tokens),
            money(t.usage.cost_usd),
        ));
    }
    o
}

pub fn project_table(by_project: &crate::reports::ByProject, json: bool) -> String {
    if json {
        return serde_json::json!({ "projects": totals_map(by_project.iter()) }).to_string();
    }
    let mut o = format!("\n{BOLD}By project{RESET}\n");
    o.push_str(&format!(
        " {BOLD}{:<32}{RESET} {:>6} {:>10} {:>10}\n",
        "Project", "Reqs", "Tokens", "Cost"
    ));
    for (p, t) in by_project {
        let tokens = t.usage.input_tokens + t.usage.output_tokens + t.usage.cache_read_tokens;
        o.push_str(&format!(
            " {:<32} {:>6} {:>10} {:>10}\n",
            p,
            compact(t.requests),
            compact(tokens),
            money(t.usage.cost_usd),
        ));
    }
    o
}

pub fn model_table(by_model: &crate::reports::ByModel, json: bool) -> String {
    if json {
        return serde_json::json!({ "models": totals_map(by_model.iter()) }).to_string();
    }
    let mut o = format!("\n{BOLD}By model{RESET}\n");
    o.push_str(&format!(
        " {BOLD}{:<32}{RESET} {:>6} {:>10} {:>10}\n",
        "Model", "Reqs", "Tokens", "Cost"
    ));
    let total_cost: f64 = by_model.values().map(|t| t.usage.cost_usd).sum();
    for (m, t) in by_model {
        let tokens = t.usage.input_tokens + t.usage.output_tokens + t.usage.cache_read_tokens;
        let share = if total_cost > 0.0 {
            format!(" {DIM}{:>5.1}%{RESET}", t.usage.cost_usd / total_cost * 100.0)
        } else {
            String::new()
        };
        o.push_str(&format!(
            " {:<32} {:>6} {:>10} {:>10}{share}\n",
            m,
            compact(t.requests),
            compact(tokens),
            money(t.usage.cost_usd),
        ));
    }
    o
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::reports::{ByProject, Totals, Usage};

    #[test]
    fn project_json_escapes_keys() {
        let mut by: ByProject = ByProject::new();
        let t = Totals {
            requests: 1,
            usage: Usage { cost_usd: 0.5, ..Default::default() },
        };
        by.insert("we\"ird\\name".into(), t);
        let out = project_table(&by, true);
        let v: serde_json::Value = serde_json::from_str(&out).unwrap();
        assert_eq!(v["projects"]["we\"ird\\name"]["requests"], 1);
    }
}