use crate::common::util::*;
use std::fs::{metadata, set_permissions, OpenOptions};
use std::os::unix::fs::{OpenOptionsExt, PermissionsExt};
use std::sync::Mutex;

extern crate libc;
use self::libc::umask;

static TEST_FILE: &'static str = "file";
static REFERENCE_FILE: &'static str = "reference";
static REFERENCE_PERMS: u32 = 0o247;
lazy_static! {
    static ref UMASK_MUTEX: Mutex<()> = Mutex::new(());
}

struct TestCase {
    args: Vec<&'static str>,
    before: u32,
    after: u32,
}

fn mkfile(file: &str, mode: u32) {
    OpenOptions::new()
        .mode(mode)
        .create(true)
        .write(true)
        .open(file)
        .unwrap();
    let mut perms = metadata(file).unwrap().permissions();
    perms.set_mode(mode);
    set_permissions(file, perms).unwrap();
}

fn run_single_test(test: &TestCase, at: AtPath, mut ucmd: UCommand) {
    mkfile(&at.plus_as_string(TEST_FILE), test.before);
    let perms = at.metadata(TEST_FILE).permissions().mode();
    if perms != test.before {
        panic!(format!(
            "{}: expected: {:o} got: {:o}",
            "setting permissions on test files before actual test run failed", test.after, perms
        ));
    }

    for arg in &test.args {
        ucmd.arg(arg);
    }
    let r = ucmd.run();
    if !r.success {
        println!("{}", r.stderr);
        panic!(format!("{:?}: failed", ucmd.raw));
    }

    let perms = at.metadata(TEST_FILE).permissions().mode();
    if perms != test.after {
        panic!(format!(
            "{:?}: expected: {:o} got: {:o}",
            ucmd.raw, test.after, perms
        ));
    }
}

fn run_tests(tests: Vec<TestCase>) {
    for test in tests {
        let (at, ucmd) = at_and_ucmd!();
        run_single_test(&test, at, ucmd);
    }
}

#[test]
fn test_chmod_octal() {
    let tests = vec![
        TestCase {
            args: vec!["0700", TEST_FILE],
            before: 0o100000,
            after: 0o100700,
        },
        TestCase {
            args: vec!["0070", TEST_FILE],
            before: 0o100000,
            after: 0o100070,
        },
        TestCase {
            args: vec!["0007", TEST_FILE],
            before: 0o100000,
            after: 0o100007,
        },
        TestCase {
            args: vec!["-0700", TEST_FILE],
            before: 0o100700,
            after: 0o100000,
        },
        TestCase {
            args: vec!["-0070", TEST_FILE],
            before: 0o100060,
            after: 0o100000,
        },
        TestCase {
            args: vec!["-0007", TEST_FILE],
            before: 0o100001,
            after: 0o100000,
        },
        TestCase {
            args: vec!["+0100", TEST_FILE],
            before: 0o100600,
            after: 0o100700,
        },
        TestCase {
            args: vec!["+0020", TEST_FILE],
            before: 0o100050,
            after: 0o100070,
        },
        TestCase {
            args: vec!["+0004", TEST_FILE],
            before: 0o100003,
            after: 0o100007,
        },
    ];
    run_tests(tests);
}

#[test]
fn test_chmod_ugoa() {
    let _guard = UMASK_MUTEX.lock();

    let last = unsafe { umask(0) };
    let tests = vec![
        TestCase {
            args: vec!["u=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100700,
        },
        TestCase {
            args: vec!["g=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100070,
        },
        TestCase {
            args: vec!["o=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100007,
        },
        TestCase {
            args: vec!["a=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100777,
        },
        TestCase {
            args: vec!["-r", TEST_FILE],
            before: 0o100777,
            after: 0o100333,
        },
        TestCase {
            args: vec!["-w", TEST_FILE],
            before: 0o100777,
            after: 0o100555,
        },
        TestCase {
            args: vec!["-x", TEST_FILE],
            before: 0o100777,
            after: 0o100666,
        },
    ];
    run_tests(tests);

    unsafe {
        umask(0o022);
    }
    let tests = vec![
        TestCase {
            args: vec!["u=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100700,
        },
        TestCase {
            args: vec!["g=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100070,
        },
        TestCase {
            args: vec!["o=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100007,
        },
        TestCase {
            args: vec!["a=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100777,
        },
        TestCase {
            args: vec!["+rw", TEST_FILE],
            before: 0o100000,
            after: 0o100644,
        },
        TestCase {
            args: vec!["=rwx", TEST_FILE],
            before: 0o100000,
            after: 0o100755,
        },
        TestCase {
            args: vec!["-w", TEST_FILE],
            before: 0o100777,
            after: 0o100577,
        },
        TestCase {
            args: vec!["-x", TEST_FILE],
            before: 0o100777,
            after: 0o100666,
        },
    ];
    run_tests(tests);
    unsafe {
        umask(last);
    }
}

#[test]
fn test_chmod_ugo_copy() {
    let tests = vec![
        TestCase {
            args: vec!["u=g", TEST_FILE],
            before: 0o100070,
            after: 0o100770,
        },
        TestCase {
            args: vec!["g=o", TEST_FILE],
            before: 0o100005,
            after: 0o100055,
        },
        TestCase {
            args: vec!["o=u", TEST_FILE],
            before: 0o100200,
            after: 0o100202,
        },
        TestCase {
            args: vec!["u-g", TEST_FILE],
            before: 0o100710,
            after: 0o100610,
        },
        TestCase {
            args: vec!["u+g", TEST_FILE],
            before: 0o100250,
            after: 0o100750,
        },
    ];
    run_tests(tests);
}

#[test]
fn test_chmod_many_options() {
    let _guard = UMASK_MUTEX.lock();

    let original_umask = unsafe { umask(0) };
    let tests = vec![TestCase {
        args: vec!["-r,a+w", TEST_FILE],
        before: 0o100444,
        after: 0o100222,
    }];
    run_tests(tests);
    unsafe {
        umask(original_umask);
    }
}

#[test]
fn test_chmod_reference_file() {
    let tests = vec![
        TestCase {
            args: vec!["--reference", REFERENCE_FILE, TEST_FILE],
            before: 0o100070,
            after: 0o100247,
        },
        TestCase {
            args: vec!["a-w", "--reference", REFERENCE_FILE, TEST_FILE],
            before: 0o100070,
            after: 0o100247,
        },
    ];
    let (at, ucmd) = at_and_ucmd!();
    mkfile(&at.plus_as_string(REFERENCE_FILE), REFERENCE_PERMS);
    run_single_test(&tests[0], at, ucmd);
}