ai-usagebar 0.7.0

//! Command-line interface — claudebar-compatible flags plus the new
//! local-testing additions (`--pretty`, `--watch`, `--json`).
//!
//! Mirrors claudebar:54-93. The defaults are identical so existing waybar
//! configs that invoke `claudebar ...` can be retargeted to
//! `ai-usagebar --vendor anthropic ...` without changing any flags.

use clap::{Parser, ValueEnum};

#[derive(Parser, Debug, Clone)]
#[command(
    name = "ai-usagebar",
    about = "Waybar widget for AI plan usage (Anthropic / OpenAI / Z.AI / OpenRouter)",
    long_about = "\
Drop-in replacement for `claudebar` with multi-vendor support.

Output modes:
  - Default: Waybar JSON ({text, tooltip, class}). Used when stdout is piped.
  - --pretty: human-readable terminal output for local testing. Auto-enabled
    when stdout is a TTY, so just running `ai-usagebar --vendor anthropic`
    in a terminal Does The Right Thing.
  - --watch N: like --pretty but refreshes every N seconds, clearing the screen
    between ticks. Useful while iterating on `--format` or `--tooltip-format`.
  - --json: force JSON output even when stdout is a TTY (for scripting)."
)]
pub struct Cli {
    /// Which vendor to query. When omitted, reads `[ui] primary` from
    /// `~/.config/ai-usagebar/config.toml`; falls back to `anthropic` if
    /// neither is set.
    #[arg(long, value_enum)]
    pub vendor: Option<Vendor>,

    /// Optional icon prepended to the bar text (Nerd Font glyph / emoji /
    /// Pango span). claudebar `--icon`.
    #[arg(long)]
    pub icon: Option<String>,

    /// Bar-text format string with `{placeholder}` substitutions.
    /// Defaults to `{session_pct}% · {session_reset}`.
    #[arg(long)]
    pub format: Option<String>,

    /// Custom tooltip format. Overrides the default bordered tooltip when
    /// set; identical placeholder set as `--format`.
    #[arg(long)]
    pub tooltip_format: Option<String>,

    /// Tolerance band (in percentage points) for ratio-based pacing icons.
    #[arg(long, default_value_t = 5)]
    pub pace_tolerance: u32,

    /// Color pace placeholders individually per window (instead of the
    /// global usage-based color). Claudebar `--format-pace-color`.
    #[arg(long)]
    pub format_pace_color: bool,

    /// Use point-based pacing in the tooltip's pace column (vs ratio-based).
    /// Also enables an elapsed-position marker on the tooltip progress bars.
    /// Claudebar `--tooltip-pace-pts`.
    #[arg(long)]
    pub tooltip_pace_pts: bool,

    /// Override the low-usage color (#RRGGBB).
    #[arg(long)]
    pub color_low: Option<String>,
    /// Override the mid-usage color (#RRGGBB).
    #[arg(long)]
    pub color_mid: Option<String>,
    /// Override the high-usage color (#RRGGBB).
    #[arg(long)]
    pub color_high: Option<String>,
    /// Override the critical-usage color (#RRGGBB).
    #[arg(long)]
    pub color_critical: Option<String>,

    /// Render human-readable terminal output (ANSI colors + box drawing)
    /// instead of Waybar JSON. Auto-on when stdout is a TTY.
    #[arg(long)]
    pub pretty: bool,

    /// Force JSON output even on a TTY (useful when piping into `jq` from
    /// an interactive shell).
    #[arg(long, conflicts_with = "pretty")]
    pub json: bool,

    /// Re-render every N seconds, clearing the screen between ticks. Implies
    /// `--pretty`. Press Ctrl-C to exit.
    #[arg(long, value_name = "SECS")]
    pub watch: Option<u64>,

    /// Cycle the persisted "active vendor" forward and exit. Wire to
    /// Waybar's `on-scroll-up` to scroll-cycle through enabled vendors.
    /// Sends SIGRTMIN+13 to waybar afterwards so the bar refreshes
    /// immediately rather than waiting for the next interval tick.
    #[arg(long, conflicts_with_all = ["cycle_prev", "watch", "pretty", "json"])]
    pub cycle_next: bool,

    /// Cycle backwards. Wire to `on-scroll-down`.
    #[arg(long, conflicts_with_all = ["cycle_next", "watch", "pretty", "json"])]
    pub cycle_prev: bool,

    /// Override the cache directory (for tests / debugging).
    #[arg(long, hide = true)]
    pub cache_dir: Option<std::path::PathBuf>,

    /// Override the credentials file path (for tests / debugging).
    #[arg(long, hide = true)]
    pub creds_path: Option<std::path::PathBuf>,
}

#[derive(Debug, Clone, Copy, ValueEnum, PartialEq, Eq)]
pub enum Vendor {
    Anthropic,
    Openai,
    Zai,
    Openrouter,
    Deepseek,
}

impl Vendor {
    pub fn to_id(self) -> crate::vendor::VendorId {
        match self {
            Vendor::Anthropic => crate::vendor::VendorId::Anthropic,
            Vendor::Openai => crate::vendor::VendorId::Openai,
            Vendor::Zai => crate::vendor::VendorId::Zai,
            Vendor::Openrouter => crate::vendor::VendorId::Openrouter,
            Vendor::Deepseek => crate::vendor::VendorId::Deepseek,
        }
    }
}

impl Cli {
    /// Resolve the vendor with full precedence:
    ///   1. explicit `--vendor` (highest)
    ///   2. persisted scroll-cycle state (`~/.cache/ai-usagebar/active_vendor`)
    ///   3. `[ui] primary` from config
    ///   4. anthropic (lowest)
    ///
    /// This reads the persisted scroll-cycle state from disk via
    /// [`crate::active::read`]. The pure precedence logic lives in
    /// [`Cli::resolve_vendor_with`] so it can be unit-tested without touching
    /// `~/.cache/ai-usagebar/active_vendor`.
    pub fn resolved_vendor(&self, config: &crate::config::Config) -> Vendor {
        // Only consult the scroll-cycle state file when it could actually
        // matter. An explicit `--vendor` wins outright (precedence #1), so we
        // skip the disk read entirely in that case — preserving the original
        // short-circuit and keeping the documented `--vendor` widget config off
        // the `active_vendor` read path.
        let active = if self.vendor.is_some() {
            None
        } else {
            crate::active::read()
        };
        self.resolve_vendor_with(config, active)
    }

    /// Pure precedence resolution given an explicit scroll-cycle `active`
    /// override (i.e. whatever [`crate::active::read`] returned). Split out
    /// from the disk read so tests exercise the precedence rules hermetically
    /// instead of depending on the developer's real `active_vendor` file.
    pub fn resolve_vendor_with(
        &self,
        config: &crate::config::Config,
        active: Option<crate::vendor::VendorId>,
    ) -> Vendor {
        if let Some(v) = self.vendor {
            return v;
        }
        if let Some(id) = active
            && config.is_enabled(id)
        {
            return id_to_vendor(id);
        }
        match config.ui.primary {
            Some(id) => id_to_vendor(id),
            None => Vendor::Anthropic,
        }
    }
}

fn id_to_vendor(id: crate::vendor::VendorId) -> Vendor {
    match id {
        crate::vendor::VendorId::Anthropic => Vendor::Anthropic,
        crate::vendor::VendorId::Openai => Vendor::Openai,
        crate::vendor::VendorId::Zai => Vendor::Zai,
        crate::vendor::VendorId::Openrouter => Vendor::Openrouter,
        crate::vendor::VendorId::Deepseek => Vendor::Deepseek,
    }
}

impl Cli {
    /// True when we should emit Waybar JSON. Default behavior: JSON when
    /// stdout is piped, pretty when on a TTY (unless `--json` is set).
    pub fn output_json(&self) -> bool {
        if self.json {
            return true;
        }
        if self.pretty || self.watch.is_some() {
            return false;
        }
        // Auto-detect: emit pretty when stdout is a TTY.
        !is_stdout_tty()
    }
}

fn is_stdout_tty() -> bool {
    use std::io::IsTerminal;
    std::io::stdout().is_terminal()
}

#[cfg(test)]
mod tests {
    use super::*;
    use clap::Parser;

    #[test]
    fn defaults_match_claudebar() {
        let cli = Cli::parse_from(["ai-usagebar"]);
        assert_eq!(cli.vendor, None);
        // Without explicit --vendor, no scroll-cycle override, and default
        // config, resolve to anthropic. Use `resolve_vendor_with(.., None)`
        // rather than `resolved_vendor` so the test never reads the real
        // ~/.cache/ai-usagebar/active_vendor file.
        let cfg = crate::config::Config::default();
        assert_eq!(cli.resolve_vendor_with(&cfg, None), Vendor::Anthropic);
        assert_eq!(cli.pace_tolerance, 5);
        assert!(cli.format.is_none());
        assert!(cli.tooltip_format.is_none());
        assert!(cli.icon.is_none());
        assert!(!cli.format_pace_color);
        assert!(!cli.tooltip_pace_pts);
        assert!(!cli.pretty);
        assert!(!cli.json);
        assert!(cli.watch.is_none());
    }

    #[test]
    fn primary_from_config_wins_when_vendor_unset() {
        // No --vendor and no scroll-cycle override → [ui] primary wins.
        let cli = Cli::parse_from(["ai-usagebar"]);
        let mut cfg = crate::config::Config::default();
        cfg.ui.primary = Some(crate::vendor::VendorId::Openrouter);
        assert_eq!(cli.resolve_vendor_with(&cfg, None), Vendor::Openrouter);
    }

    #[test]
    fn explicit_vendor_overrides_everything() {
        // Explicit --vendor beats BOTH a persisted scroll-cycle override and
        // [ui] primary.
        let cli = Cli::parse_from(["ai-usagebar", "--vendor", "zai"]);
        let mut cfg = crate::config::Config::default();
        cfg.ui.primary = Some(crate::vendor::VendorId::Openrouter);
        let active = Some(crate::vendor::VendorId::Openai);
        assert_eq!(cli.resolve_vendor_with(&cfg, active), Vendor::Zai);
    }

    #[test]
    fn active_override_wins_over_config_primary_when_enabled() {
        // Precedence rule #2: a persisted scroll-cycle vendor beats [ui]
        // primary, as long as it is still enabled.
        let cli = Cli::parse_from(["ai-usagebar"]);
        let mut cfg = crate::config::Config::default();
        cfg.ui.primary = Some(crate::vendor::VendorId::Openrouter);
        let active = Some(crate::vendor::VendorId::Zai);
        assert_eq!(cli.resolve_vendor_with(&cfg, active), Vendor::Zai);
    }

    #[test]
    fn disabled_active_override_falls_back_to_config_primary() {
        // A persisted active vendor the user has since disabled is skipped;
        // resolution falls through to [ui] primary.
        let cli = Cli::parse_from(["ai-usagebar"]);
        let mut cfg = crate::config::Config::default();
        cfg.zai.enabled = false;
        cfg.ui.primary = Some(crate::vendor::VendorId::Openrouter);
        let active = Some(crate::vendor::VendorId::Zai);
        assert_eq!(cli.resolve_vendor_with(&cfg, active), Vendor::Openrouter);
    }

    #[test]
    fn claudebar_compatible_flag_surface() {
        let cli = Cli::parse_from([
            "ai-usagebar",
            "--icon",
            "󰚩",
            "--format",
            "{session_pct}% · {session_reset}",
            "--tooltip-format",
            "S:{session_pct}",
            "--pace-tolerance",
            "10",
            "--format-pace-color",
            "--tooltip-pace-pts",
            "--color-low",
            "#50fa7b",
            "--color-mid",
            "#f1fa8c",
            "--color-high",
            "#ffb86c",
            "--color-critical",
            "#ff5555",
        ]);
        assert_eq!(cli.icon.as_deref(), Some("󰚩"));
        assert_eq!(
            cli.format.as_deref(),
            Some("{session_pct}% · {session_reset}")
        );
        assert_eq!(cli.tooltip_format.as_deref(), Some("S:{session_pct}"));
        assert_eq!(cli.pace_tolerance, 10);
        assert!(cli.format_pace_color);
        assert!(cli.tooltip_pace_pts);
        assert_eq!(cli.color_low.as_deref(), Some("#50fa7b"));
        assert_eq!(cli.color_critical.as_deref(), Some("#ff5555"));
    }

    #[test]
    fn pretty_and_json_conflict() {
        let res = Cli::try_parse_from(["ai-usagebar", "--pretty", "--json"]);
        assert!(res.is_err());
    }

    #[test]
    fn watch_disables_json_output() {
        let cli = Cli::parse_from(["ai-usagebar", "--watch", "5"]);
        assert_eq!(cli.watch, Some(5));
        assert!(!cli.output_json());
    }
}