//! End-to-end decryption test driven by the fixtures in `fixtures/`.
//!
//! The committed fixtures are small, fully synthetic containers (see
//! `fixtures/README.md`) — a base APP, a delta APP, and an OPTION — so this runs
//! the whole decrypt-and-extract path, including the delta/base VHD merge, with
//! no proprietary data. You can also drop your own real `.app`/`.opt` files in
//! `fixtures/` (they are git-ignored) and they'll be exercised too. When
//! `fixtures/` is empty the test is a no-op, so the suite stays green regardless.

use std::fs;
use std::path::{Path, PathBuf};
use std::process::Command;

fn fixture_files() -> Vec<PathBuf> {
    let dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("fixtures");
    let Ok(entries) = fs::read_dir(dir) else {
        return Vec::new();
    };
    let mut files: Vec<PathBuf> = entries
        .filter_map(|e| e.ok().map(|e| e.path()))
        .filter(|p| {
            p.is_file()
                && matches!(
                    p.extension().and_then(|e| e.to_str()),
                    Some("app") | Some("opt")
                )
        })
        .collect();
    files.sort();
    files
}

#[test]
fn decrypts_fixture_containers() {
    let files = fixture_files();
    if files.is_empty() {
        eprintln!(
            "skipping e2e: no .app/.opt fixtures in {}/fixtures — add containers to run this test",
            env!("CARGO_MANIFEST_DIR")
        );
        return;
    }

    // Work in a temp dir so extraction never touches the fixtures folder. The
    // tool extracts next to its input, so we copy every fixture in *first* — a
    // delta APP needs its base APP sitting alongside for the auto-merge.
    let workdir = std::env::temp_dir().join(format!("fsdecrypt-e2e-{}", std::process::id()));
    let _ = fs::remove_dir_all(&workdir);
    fs::create_dir_all(&workdir).expect("create work dir");

    // Copy *every* fixture file in — the containers plus any external
    // `{game_id}.bin` key files an unlisted game needs.
    let dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("fixtures");
    if let Ok(entries) = fs::read_dir(&dir) {
        for e in entries.filter_map(|e| e.ok()) {
            let p = e.path();
            if p.is_file() {
                let _ = fs::copy(&p, workdir.join(p.file_name().unwrap()));
            }
        }
    }
    let inputs: Vec<PathBuf> = files
        .iter()
        .map(|f| workdir.join(f.file_name().unwrap()))
        .collect();

    for input in &inputs {
        let name = input.file_name().unwrap().to_os_string();
        // Run from the work dir so the binary resolves `{game_id}.bin` keys there.
        let output = Command::new(env!("CARGO_BIN_EXE_fsdecrypt"))
            .current_dir(&workdir)
            .arg(input)
            .output()
            .expect("failed to run fsdecrypt");

        let stdout = String::from_utf8_lossy(&output.stdout);
        let stderr = String::from_utf8_lossy(&output.stderr);
        assert!(
            output.status.success(),
            "decrypting {name:?} failed (exit {:?})\n--- stdout ---\n{stdout}\n--- stderr ---\n{stderr}",
            output.status.code()
        );

        // A default run extracts into a folder named after the input (no extension).
        let out_dir = input.with_extension("");
        let produced = fs::read_dir(&out_dir).map(|rd| rd.count()).unwrap_or(0);
        assert!(
            produced > 0,
            "{name:?}: expected extracted entries in {}\n--- stdout ---\n{stdout}",
            out_dir.display()
        );
        println!("ok: {name:?} -> {produced} top-level entr(y/ies) extracted");
    }

    let _ = fs::remove_dir_all(&workdir);
}