//! `cube` — the CUBELinux-2 system CLI (local, in-process).
//!
//! One process holds ONE in-memory `CubeStore` shared by cubefs, cubecode and
//! cubecrypt. Commands are issued as a script (file) or interactively (REPL);
//! every command operates on that shared store, so `write` then `run` then
//! `seal` then `open` all see the same cube.
//!
//! For a persistent store served over a socket by a long-running daemon, use
//! `cube-server` + `cubec` instead (see `docs/integration.md`).
//!
//! Usage:
//!   cube                 # print this help
//!   cube demo            # run the built-in integration demo
//!   cube repl            # read commands from stdin, one per line
//!   cube script <file>   # read commands from <file>, one per line
//!
//! Commands (operate on the shared cube):
//!   prog  <path> <ops...>        # write CUBEVM bytecode from op names
//!   write <path> <bytes...>      # store cubevm bytecode (hex/dec) at a path
//!   run   <path>                 # load the code cell at <path> and run the VM
//!   ls    <dir>                  # list a cubefs directory
//!   stat  <path>                 # getattr via cubefs
//!   seal  <path> <K.C.Z.Y.X> <tf> # encrypt the record at <path> (tf: none|gcm|chacha|xts)
//!   open  <path> <K.C.Z.Y.X> <tf> # decrypt + decode + run the sealed record
//!
//! Coordinates are written `C.Z.Y.X` (decimal). Key cells live in Null space,
//! so they are given directly as coordinates, not as cubefs paths.

use std::io::BufRead;

use cubesys::commands::Session;

/// Command words understood by the shared interpreter. When `cube`'s first
/// argument is one of these, it is run as a single command against a fresh
/// in-memory store (the same path as `cube repl`), so the OS / a script can
/// invoke e.g. `cube open /c001/z001/y001/x001 001.001.001.001 none` directly
/// — this is the Phase-3 "open by CZYX + flags" surface made a first-class
/// CLI command rather than REPL-only.
fn is_command_word(w: &str) -> bool {
    matches!(
        w,
        "prog"
            | "write"
            | "run"
            | "ls"
            | "stat"
            | "seal"
            | "open"
            | "query"
            | "begin"
            | "commit"
            | "rollback"
            | "stats"
            | "audit"
    )
}

fn main() {
    let args: Vec<String> = std::env::args().collect();
    match args.get(1).map(|s| s.as_str()) {
        None => print_help(),
        Some("demo") => cubesys::demo::run(),
        // A direct command word (e.g. `cube open <path> <K.Z.Y.X> <tf>`): run it
        // against a fresh in-memory session and exit with the result. This makes
        // the coordinate-addressed API a real CLI surface the OS can call.
        Some(word) if is_command_word(word) => {
            let line = args[1..].join(" ");
            let mut session = Session::new();
            match session.exec(&line) {
                Ok(out) => println!("{out}"),
                Err(e) => {
                    eprintln!("error: {e}");
                    std::process::exit(1);
                }
            }
        }
        Some("repl") => {
            let mut session = Session::new();
            let stdin = std::io::stdin();
            let lock = stdin.lock();
            for line in lock.lines() {
                let line = match line {
                    Ok(l) => l,
                    Err(_) => break,
                };
                if line.trim().is_empty() || line.starts_with('#') {
                    continue;
                }
                match session.exec(&line) {
                    Ok(out) => println!("{out}"),
                    Err(e) => eprintln!("error: {e}"),
                }
            }
        }
        Some("script") => {
            let file = args.get(2).expect("script needs <file>");
            let text = std::fs::read_to_string(file).expect("cannot read script file");
            let mut session = Session::new();
            for line in text.lines() {
                if line.trim().is_empty() || line.starts_with('#') {
                    continue;
                }
                match session.exec(line) {
                    Ok(out) => println!("{out}"),
                    Err(e) => {
                        eprintln!("error: {e}");
                        std::process::exit(1);
                    }
                }
            }
        }
        Some(other) => {
            eprintln!("unknown subcommand: {other}\n");
            print_help();
            std::process::exit(2);
        }
    }
}

fn print_help() {
    println!(
        "cube - CUBELinux-2 system CLI (cubefs + cubecode + cubecrypt over one store)\n\
         \n\
         Usage:\n  \
           cube                show this help\n  \
           cube demo           run the built-in integration demo\n  \
           cube repl           read commands from stdin (one per line)\n  \
           cube script <file>  run commands from a file\n\
         \nCommands:\n  \
           prog  <path> <ops...>        write CUBEVM bytecode from op names\n  \
           write <path> <bytes...>        store cubevm bytecode at a path\n  \
           run   <path>                  run the code cell at <path>\n  \
           ls    <dir>                   list a cubefs directory\n  \
           stat  <path>                  getattr via cubefs\n  \
           seal  <path> <K.Z.Y.X> <tf>   encrypt a record (tf: none|gcm|chacha|xts)\n  \
           open  <path> <K.Z.Y.X> <tf>   decrypt + decode + run a sealed record\n"
    );
}