from __future__ import absolute_import

import subprocess
import sys
import unittest

import mozunit
from mozprocess.processhandler import ProcessReader, StoreOutput


def run_python(str_code, stdout=subprocess.PIPE, stderr=subprocess.PIPE):
    cmd = [sys.executable, "-c", str_code]
    return subprocess.Popen(cmd, stdout=stdout, stderr=stderr)


class TestProcessReader(unittest.TestCase):
    def setUp(self):
        self.out = StoreOutput()
        self.err = StoreOutput()
        self.finished = False

        def on_finished():
            self.finished = True

        self.timeout = False

        def on_timeout():
            self.timeout = True

        self.reader = ProcessReader(
            stdout_callback=self.out,
            stderr_callback=self.err,
            finished_callback=on_finished,
            timeout_callback=on_timeout,
        )

    def test_stdout_callback(self):
        proc = run_python("print(1); print(2)")
        self.reader.start(proc)
        self.reader.thread.join()

        self.assertEqual([x.decode("utf8") for x in self.out.output], ["1", "2"])
        self.assertEqual(self.err.output, [])

    def test_stderr_callback(self):
        proc = run_python('import sys; sys.stderr.write("hello world\\n")')
        self.reader.start(proc)
        self.reader.thread.join()

        self.assertEqual(self.out.output, [])
        self.assertEqual([x.decode("utf8") for x in self.err.output], ["hello world"])

    def test_stdout_and_stderr_callbacks(self):
        proc = run_python(
            'import sys; sys.stderr.write("hello world\\n"); print(1); print(2)'
        )
        self.reader.start(proc)
        self.reader.thread.join()

        self.assertEqual([x.decode("utf8") for x in self.out.output], ["1", "2"])
        self.assertEqual([x.decode("utf8") for x in self.err.output], ["hello world"])

    def test_finished_callback(self):
        self.assertFalse(self.finished)
        proc = run_python("")
        self.reader.start(proc)
        self.reader.thread.join()
        self.assertTrue(self.finished)

    def test_timeout(self):
        self.reader.timeout = 0.05
        self.assertFalse(self.timeout)
        proc = run_python("import time; time.sleep(0.1)")
        self.reader.start(proc)
        self.reader.thread.join()
        self.assertTrue(self.timeout)
        self.assertFalse(self.finished)

    def test_output_timeout(self):
        self.reader.output_timeout = 0.05
        self.assertFalse(self.timeout)
        proc = run_python("import time; time.sleep(0.1)")
        self.reader.start(proc)
        self.reader.thread.join()
        self.assertTrue(self.timeout)
        self.assertFalse(self.finished)

    def test_read_without_eol(self):
        proc = run_python('import sys; sys.stdout.write("1")')
        self.reader.start(proc)
        self.reader.thread.join()
        self.assertEqual([x.decode("utf8") for x in self.out.output], ["1"])

    def test_read_with_strange_eol(self):
        proc = run_python('import sys; sys.stdout.write("1\\r\\r\\r\\n")')
        self.reader.start(proc)
        self.reader.thread.join()
        self.assertEqual([x.decode("utf8") for x in self.out.output], ["1"])

    def test_mixed_stdout_stderr(self):
        proc = run_python(
            'import sys; sys.stderr.write("hello world\\n"); print(1); print(2)',
            stderr=subprocess.STDOUT,
        )
        self.reader.start(proc)
        self.reader.thread.join()

        self.assertEqual(
            sorted([x.decode("utf8") for x in self.out.output]),
            sorted(["1", "2", "hello world"]),
        )
        self.assertEqual(self.err.output, [])


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