//! CLI round-trip integration tests.
//!
//! Each test runs the actual `encrypted_archive` binary via `assert_cmd`,
//! packs files into an archive, unpacks them, and verifies byte-identical output.
//! All tests use `tempdir()` for isolation (auto-cleanup, parallel-safe).

use assert_cmd::Command;
use std::fs;
use tempfile::tempdir;

/// Helper: get a Command for the encrypted_archive binary.
fn cmd() -> Command {
    Command::new(assert_cmd::cargo::cargo_bin!("encrypted_archive"))
}

/// Single text file: pack "Hello", unpack, verify byte-identical.
#[test]
fn test_roundtrip_single_text_file() {
    let dir = tempdir().unwrap();
    let input_file = dir.path().join("hello.txt");
    let archive = dir.path().join("archive.bin");
    let output_dir = dir.path().join("output");

    fs::write(&input_file, b"Hello").unwrap();

    cmd()
        .args(["pack", input_file.to_str().unwrap(), "-o", archive.to_str().unwrap()])
        .assert()
        .success();

    cmd()
        .args(["unpack", archive.to_str().unwrap(), "-o", output_dir.to_str().unwrap()])
        .assert()
        .success();

    let extracted = fs::read(output_dir.join("hello.txt")).unwrap();
    assert_eq!(extracted, b"Hello");
}

/// Multiple files: pack two files, unpack, verify both byte-identical.
#[test]
fn test_roundtrip_multiple_files() {
    let dir = tempdir().unwrap();
    let text_file = dir.path().join("text.txt");
    let binary_file = dir.path().join("binary.dat");
    let archive = dir.path().join("archive.bin");
    let output_dir = dir.path().join("output");

    fs::write(&text_file, b"Some text content").unwrap();
    fs::write(&binary_file, &[0x42u8; 256]).unwrap();

    cmd()
        .args([
            "pack",
            text_file.to_str().unwrap(),
            binary_file.to_str().unwrap(),
            "-o",
            archive.to_str().unwrap(),
        ])
        .assert()
        .success();

    cmd()
        .args(["unpack", archive.to_str().unwrap(), "-o", output_dir.to_str().unwrap()])
        .assert()
        .success();

    assert_eq!(
        fs::read(output_dir.join("text.txt")).unwrap(),
        b"Some text content"
    );
    assert_eq!(
        fs::read(output_dir.join("binary.dat")).unwrap(),
        vec![0x42u8; 256]
    );
}

/// Empty file: pack 0-byte file, unpack, verify extracted file is exactly 0 bytes.
/// This tests PKCS7 full-block padding on 0-byte input (encrypted_size = 16).
#[test]
fn test_roundtrip_empty_file() {
    let dir = tempdir().unwrap();
    let input_file = dir.path().join("empty.txt");
    let archive = dir.path().join("archive.bin");
    let output_dir = dir.path().join("output");

    fs::write(&input_file, b"").unwrap();

    cmd()
        .args(["pack", input_file.to_str().unwrap(), "-o", archive.to_str().unwrap()])
        .assert()
        .success();

    cmd()
        .args(["unpack", archive.to_str().unwrap(), "-o", output_dir.to_str().unwrap()])
        .assert()
        .success();

    let extracted = fs::read(output_dir.join("empty.txt")).unwrap();
    assert!(extracted.is_empty(), "Empty file should extract as 0 bytes");
}

/// Cyrillic filename: pack file with UTF-8 non-ASCII name, unpack, verify content.
/// This tests non-ASCII (UTF-8) filename handling in TOC entries.
#[test]
fn test_roundtrip_cyrillic_filename() {
    let dir = tempdir().unwrap();
    let input_file = dir.path().join("файл.txt");
    let archive = dir.path().join("archive.bin");
    let output_dir = dir.path().join("output");

    let content = "Содержимое".as_bytes();
    fs::write(&input_file, content).unwrap();

    cmd()
        .args(["pack", input_file.to_str().unwrap(), "-o", archive.to_str().unwrap()])
        .assert()
        .success();

    cmd()
        .args(["unpack", archive.to_str().unwrap(), "-o", output_dir.to_str().unwrap()])
        .assert()
        .success();

    let extracted = fs::read(output_dir.join("файл.txt")).unwrap();
    assert_eq!(extracted, content);
}

/// Large file (11MB): pack, unpack, verify byte-identical.
/// Tests large file handling (>10MB) per Phase 3 success criteria.
#[test]
fn test_roundtrip_large_file() {
    let dir = tempdir().unwrap();
    let input_file = dir.path().join("large.bin");
    let archive = dir.path().join("archive.bin");
    let output_dir = dir.path().join("output");

    // Generate 11MB of deterministic pseudo-random data
    let data: Vec<u8> = (0..11_000_000u32)
        .map(|i| i.wrapping_mul(2654435761) as u8)
        .collect();
    fs::write(&input_file, &data).unwrap();

    // Pack with --no-compress bin (skip compression for binary extension)
    cmd()
        .args([
            "pack",
            input_file.to_str().unwrap(),
            "-o",
            archive.to_str().unwrap(),
            "--no-compress",
            "bin",
        ])
        .assert()
        .success();

    cmd()
        .args(["unpack", archive.to_str().unwrap(), "-o", output_dir.to_str().unwrap()])
        .assert()
        .success();

    let extracted = fs::read(output_dir.join("large.bin")).unwrap();
    assert_eq!(extracted.len(), data.len(), "Extracted file size must match original");
    assert_eq!(extracted, data, "Extracted file content must be byte-identical");
}

/// No-compress flag: pack APK file (auto-detected as no-compress), unpack, verify.
/// APK extension is in the known compressed extensions list, so compression_flag=0.
#[test]
fn test_roundtrip_no_compress_flag() {
    let dir = tempdir().unwrap();
    let input_file = dir.path().join("data.apk");
    let archive = dir.path().join("archive.bin");
    let output_dir = dir.path().join("output");

    // 100 bytes of pattern data
    let data: Vec<u8> = (0..100u8).collect();
    fs::write(&input_file, &data).unwrap();

    cmd()
        .args(["pack", input_file.to_str().unwrap(), "-o", archive.to_str().unwrap()])
        .assert()
        .success();

    cmd()
        .args(["unpack", archive.to_str().unwrap(), "-o", output_dir.to_str().unwrap()])
        .assert()
        .success();

    let extracted = fs::read(output_dir.join("data.apk")).unwrap();
    assert_eq!(extracted, data);
}