//! End-to-end against a real tmux server.
//!
//! Covers what the unit tests deliberately cannot: that the grid's idea of
//! "sub-screen 3 of the cell at 0x0" lands on the pane a person would expect,
//! zoomed. Skipped when tmux is not installed.

use std::process::{Command, Stdio};

use socktop_swipe::config::Config;
use socktop_swipe::grid::{Grid, Move};
use socktop_swipe::monitor;
use socktop_swipe::session::tmux::Tmux;
use socktop_swipe::session::Multiplexer;

const SESSION: &str = "socktop-swipe-selftest";

fn have_tmux() -> bool {
    Command::new("tmux")
        .arg("-V")
        .stdout(Stdio::null())
        .stderr(Stdio::null())
        .status()
        .map(|s| s.success())
        .unwrap_or(false)
}

fn tmux(args: &[&str]) -> String {
    let out = Command::new("tmux").args(args).output().expect("tmux");
    String::from_utf8_lossy(&out.stdout).trim().to_owned()
}

fn config() -> Config {
    // `true` exits at once, which also exercises remain-on-exit keeping the
    // pane addressable afterwards.
    let yaml = format!(
        r#"
session: {SESSION}
binaries: {{ socktop: /bin/echo, unifly: /bin/echo, uptime-kuma-status: /bin/echo }}
touch: {{ device: /dev/null, width: 1280, height: 720, grab: false }}
screens:
  - at: "-1x0"
    type: unifly
  - at: "0x0"
    type: socktop
    socktop_group: [alpha, bravo, charlie, delta]
    layout: tiled
  - at: "0x5"
    type: socktop
    socktop_group: "echo1, foxtrot"
    layout: even-vertical
  - at: "1x0"
    type: uptime-kuma-status
    url: https://example.invalid/status
"#
    );
    serde_yaml::from_str(&yaml).expect("test config should parse")
}

/// (active window name, active pane title, is the window zoomed)
fn visible() -> (String, String, bool) {
    let s = tmux(&[
        "display-message",
        "-p",
        "-t",
        SESSION,
        "#{window_name}\t#{pane_title}\t#{window_zoomed_flag}",
    ]);
    let f: Vec<&str> = s.split('\t').collect();
    (f[0].into(), f[1].into(), f[2] == "1")
}

struct Cleanup;
impl Drop for Cleanup {
    fn drop(&mut self) {
        let _ = Command::new("tmux")
            .args(["kill-session", "-t", SESSION])
            .stdout(Stdio::null())
            .stderr(Stdio::null())
            .status();
    }
}

#[test]
fn session_layout_and_navigation_match_the_grid() {
    if !have_tmux() {
        eprintln!("skipping: tmux is not installed");
        return;
    }
    let _cleanup = Cleanup;

    let cfg = config();
    let mut grid = Grid::new(monitor::build_cells(&cfg).unwrap()).unwrap();
    let mux = Tmux::new(&cfg.session, false);
    mux.build(&grid).expect("session should build");

    // One window per cell, in grid order, named by coordinate.
    let windows = tmux(&["list-windows", "-t", SESSION, "-F", "#{window_name} #{window_panes}"]);
    assert_eq!(
        windows.lines().collect::<Vec<_>>(),
        vec!["rm1c0 1", "r0c0 4", "r0c5 2", "r1c0 1"],
        "windows should be one per cell, in grid order, with one pane per host"
    );

    // Starts at 0x0's overview: not zoomed, so all four Pis are visible.
    let (win, _, zoomed) = visible();
    assert_eq!(win, "r0c0");
    assert!(!zoomed, "the overview must not be zoomed");

    // Forward walks the sub-sequence, zooming each host in declaration order.
    for expected in ["alpha", "bravo", "charlie", "delta"] {
        let pos = grid.apply(Move::Forward);
        mux.show(&grid, &pos).unwrap();
        let (win, title, zoomed) = visible();
        assert_eq!(win, "r0c0");
        assert_eq!(title, expected, "wrong host zoomed");
        assert!(zoomed, "{expected} should be zoomed full-screen");
    }

    // Past the last host, on to the next cell's overview.
    let pos = grid.apply(Move::Forward);
    mux.show(&grid, &pos).unwrap();
    let (win, _, zoomed) = visible();
    assert_eq!(win, "r0c5", "0x5 follows 0x0 despite the gap in column numbers");
    assert!(!zoomed);

    // Back must land on 0x0's LAST host, not its overview.
    let pos = grid.apply(Move::Back);
    mux.show(&grid, &pos).unwrap();
    let (win, title, zoomed) = visible();
    assert_eq!((win.as_str(), title.as_str(), zoomed), ("r0c0", "delta", true));

    // Up to unifly: a single-pane cell, so nothing to zoom.
    let pos = grid.apply(Move::Up);
    mux.show(&grid, &pos).unwrap();
    let (win, _, zoomed) = visible();
    assert_eq!(win, "rm1c0");
    assert!(!zoomed, "a one-pane cell has nothing to zoom into");

    // And back down to exactly the host we left.
    let pos = grid.apply(Move::Down);
    mux.show(&grid, &pos).unwrap();
    let (win, title, zoomed) = visible();
    assert_eq!(
        (win.as_str(), title.as_str(), zoomed),
        ("r0c0", "delta", true),
        "returning must restore the host AND its zoom"
    );

    // Down twice: through row 0 to kuma.
    let pos = grid.apply(Move::Down);
    mux.show(&grid, &pos).unwrap();
    assert_eq!(visible().0, "r1c0");
}

#[test]
fn pane_commands_are_quoted_not_interpreted() {
    if !have_tmux() {
        return;
    }
    // A profile name containing shell metacharacters must reach the program as
    // one argument, not be re-split or evaluated by the sh tmux runs it under.
    let cfg: Config = serde_yaml::from_str(
        r#"
session: socktop-swipe-quoting-test
binaries: { socktop: /bin/echo }
touch: { device: /dev/null, width: 1, height: 1, grab: false }
screens:
  - at: "0x0"
    type: socktop
    socktop_group: ["a b; touch /tmp/socktop-swipe-pwned"]
"#,
    )
    .unwrap();

    let cells = monitor::build_cells(&cfg).unwrap();
    let argv = &cells[0].panes[0].command;
    assert_eq!(argv, &["/bin/echo", "-P", "a b; touch /tmp/socktop-swipe-pwned"]);

    let quoted = shell_words::join(argv.iter().map(String::as_str));
    let reparsed = shell_words::split(&quoted).unwrap();
    assert_eq!(&reparsed, argv, "quoting must survive the round trip through sh");
}