import os
import os.path
import subprocess
import sys
import time
import unittest
from shutil import rmtree
from tempfile import mkdtemp

import mozunit
import nsinstall as nsinstall_module
from nsinstall import nsinstall

NSINSTALL_PATH = nsinstall_module.__file__

# Run the non-ASCII tests on (a) Windows, or (b) any platform with
# sys.stdin.encoding set to UTF-8
import codecs

RUN_NON_ASCII_TESTS = sys.platform == "win32" or (
    sys.stdin.encoding is not None
    and codecs.lookup(sys.stdin.encoding) == codecs.lookup("utf-8")
)


class TestNsinstall(unittest.TestCase):
    """
    Unit tests for nsinstall.py
    """

    def setUp(self):
        self.tmpdir = mkdtemp()

    def tearDown(self):
        rmtree(self.tmpdir)

    # utility methods for tests
    def touch(self, file, dir=None):
        if dir is None:
            dir = self.tmpdir
        f = os.path.join(dir, file)
        open(f, "w").close()
        return f

    def mkdirs(self, dir):
        d = os.path.join(self.tmpdir, dir)
        os.makedirs(d)
        return d

    def test_nsinstall_D(self):
        "Test nsinstall -D <dir>"
        testdir = os.path.join(self.tmpdir, "test")
        self.assertEqual(nsinstall(["-D", testdir]), 0)
        self.assertTrue(os.path.isdir(testdir))

    def test_nsinstall_basic(self):
        "Test nsinstall <file> <dir>"
        testfile = self.touch("testfile")
        testdir = self.mkdirs("testdir")
        self.assertEqual(nsinstall([testfile, testdir]), 0)
        self.assertTrue(os.path.isfile(os.path.join(testdir, "testfile")))

    def test_nsinstall_basic_recursive(self):
        "Test nsinstall <dir> <dest dir>"
        sourcedir = self.mkdirs("sourcedir")
        self.touch("testfile", sourcedir)
        Xfile = self.touch("Xfile", sourcedir)
        copieddir = self.mkdirs("sourcedir/copieddir")
        self.touch("testfile2", copieddir)
        Xdir = self.mkdirs("sourcedir/Xdir")
        self.touch("testfile3", Xdir)

        destdir = self.mkdirs("destdir")

        self.assertEqual(nsinstall([sourcedir, destdir, "-X", Xfile, "-X", Xdir]), 0)

        testdir = os.path.join(destdir, "sourcedir")
        self.assertTrue(os.path.isdir(testdir))
        self.assertTrue(os.path.isfile(os.path.join(testdir, "testfile")))
        self.assertTrue(not os.path.exists(os.path.join(testdir, "Xfile")))
        self.assertTrue(os.path.isdir(os.path.join(testdir, "copieddir")))
        self.assertTrue(os.path.isfile(os.path.join(testdir, "copieddir", "testfile2")))
        self.assertTrue(not os.path.exists(os.path.join(testdir, "Xdir")))

    def test_nsinstall_multiple(self):
        "Test nsinstall <three files> <dest dir>"
        testfiles = [
            self.touch("testfile1"),
            self.touch("testfile2"),
            self.touch("testfile3"),
        ]
        testdir = self.mkdirs("testdir")
        self.assertEqual(nsinstall(testfiles + [testdir]), 0)
        for f in testfiles:
            self.assertTrue(os.path.isfile(os.path.join(testdir, os.path.basename(f))))

    def test_nsinstall_dir_exists(self):
        "Test nsinstall <dir> <dest dir>, where <dest dir>/<dir> already exists"
        srcdir = self.mkdirs("test")
        destdir = self.mkdirs("testdir/test")
        self.assertEqual(nsinstall([srcdir, os.path.dirname(destdir)]), 0)
        self.assertTrue(os.path.isdir(destdir))

    def test_nsinstall_t(self):
        "Test that nsinstall -t works (preserve timestamp)"
        testfile = self.touch("testfile")
        testdir = self.mkdirs("testdir")
        # set mtime to now - 30 seconds
        t = int(time.time()) - 30
        os.utime(testfile, (t, t))
        self.assertEqual(nsinstall(["-t", testfile, testdir]), 0)
        destfile = os.path.join(testdir, "testfile")
        self.assertTrue(os.path.isfile(destfile))
        self.assertEqual(os.stat(testfile).st_mtime, os.stat(destfile).st_mtime)

    @unittest.skipIf(sys.platform == "win32", "Windows doesn't have real file modes")
    def test_nsinstall_m(self):
        "Test that nsinstall -m works (set mode)"
        testfile = self.touch("testfile")
        mode = 0o600
        os.chmod(testfile, mode)
        testdir = self.mkdirs("testdir")
        self.assertEqual(nsinstall(["-m", f"{mode:04o}", testfile, testdir]), 0)
        destfile = os.path.join(testdir, "testfile")
        self.assertTrue(os.path.isfile(destfile))
        self.assertEqual(os.stat(testfile).st_mode, os.stat(destfile).st_mode)

    def test_nsinstall_d(self):
        "Test that nsinstall -d works (create directories in target)"
        # -d makes no sense to me, but ok!
        testfile = self.touch("testfile")
        testdir = self.mkdirs("testdir")
        destdir = os.path.join(testdir, "subdir")
        self.assertEqual(nsinstall(["-d", testfile, destdir]), 0)
        self.assertTrue(os.path.isdir(os.path.join(destdir, "testfile")))

    @unittest.skipIf(not RUN_NON_ASCII_TESTS, "Skipping non ascii tests")
    def test_nsinstall_non_ascii(self):
        "Test that nsinstall handles non-ASCII files"
        filename = "\u2325\u3452\u2415\u5081"
        testfile = self.touch(filename)
        testdir = self.mkdirs("\u4241\u1D04\u1414")
        self.assertEqual(
            nsinstall([testfile.encode("utf-8"), testdir.encode("utf-8")]), 0
        )

        destfile = os.path.join(testdir, filename)
        self.assertTrue(os.path.isfile(destfile))

    # Executing nsinstall.py with python 2 is not supported.
    @unittest.skipIf(
        not RUN_NON_ASCII_TESTS or sys.version_info[0] == 2, "Skipping non ascii tests"
    )
    def test_nsinstall_non_ascii_subprocess(self):
        "Test that nsinstall as a subprocess handles non-ASCII files"
        filename = "\u2325\u3452\u2415\u5081"
        testfile = self.touch(filename)
        testdir = self.mkdirs("\u4241\u1D04\u1414")
        p = subprocess.Popen([sys.executable, NSINSTALL_PATH, testfile, testdir])
        rv = p.wait()

        self.assertEqual(rv, 0)
        destfile = os.path.join(testdir, filename)
        self.assertTrue(os.path.isfile(destfile))

    # TODO: implement -R, -l, -L and test them!


if __name__ == "__main__":
    mozunit.main()