import subprocess

from grass.gunittest.case import TestCase
from grass.gunittest.main import test
from grass.gunittest.gmodules import call_module, CalledModuleError

G_REGION_OUTPUT = """...
n=...
s=...
w=...
e=...
nsres=...
ewres=...
rows=...
cols=...
cells=...
"""


class TestCallModuleFunction(TestCase):
    def test_output(self):
        output = call_module("g.region", flags="pg")
        self.assertLooksLike(output, G_REGION_OUTPUT)

    def test_input_output(self):
        output = call_module("m.proj", flags="i", input="-", stdin="50.0 41.5")
        self.assertLooksLike(output, "...|...\n")

    def test_no_output(self):
        output = call_module(
            "m.proj", flags="i", input="-", stdin="50.0 41.5", capture_stdout=False
        )
        self.assertIsNone(output)

    def test_merge_stderr(self):
        output = call_module(
            "m.proj",
            flags="i",
            input="-",
            stdin="50.0 41.5",
            verbose=True,
            merge_stderr=True,
        )
        self.assertLooksLike(output, "...+proj=longlat +datum=WGS84...")
        self.assertLooksLike(output, "...|...\n")

    def test_merge_stderr_with_wrong_stdin_stderr(self):
        self.assertRaises(
            ValueError,
            call_module,
            "m.proj",
            flags="i",
            input="-",
            stdin="50.0 41.5",
            verbose=True,
            merge_stderr=True,
            capture_stdout=False,
        )
        self.assertRaises(
            ValueError,
            call_module,
            "m.proj",
            flags="i",
            input="-",
            stdin="50.0 41.5",
            verbose=True,
            merge_stderr=True,
            capture_stderr=False,
        )
        self.assertRaises(
            ValueError,
            call_module,
            "m.proj",
            flags="i",
            input="-",
            stdin="50.0 41.5",
            verbose=True,
            merge_stderr=True,
            capture_stdout=False,
            capture_stderr=False,
        )

    def test_wrong_module_params(self):
        self.assertRaises(
            CalledModuleError, call_module, "g.region", aabbbccc="notexist"
        )

    def test_module_input_param_wrong(self):
        self.assertRaises(
            ValueError,
            call_module,
            "m.proj",
            flags="i",
            input="does_not_exist",
            stdin="50.0 41.5",
        )

    def test_missing_stdin_with_input_param(self):
        self.assertRaises(ValueError, call_module, "m.proj", flags="i", input="-")

    def test_wrong_usage_of_popen_like_interface(self):
        self.assertRaises(
            ValueError,
            call_module,
            "m.proj",
            flags="i",
            input="-",
            stdin=subprocess.PIPE,
        )
        self.assertRaises(
            TypeError,
            call_module,
            "m.proj",
            flags="i",
            input="-",
            stdin="50.0 41.5",
            stdout="any_value_or_type_here",
        )
        self.assertRaises(
            TypeError,
            call_module,
            "m.proj",
            flags="i",
            input="-",
            stdin="50.0 41.5",
            stderr="any_value_or_type_here",
        )


if __name__ == "__main__":
    test()