from parsimonious.grammar import Grammar

from customcmd.parser import Execuitor, ExecContext
from customcmd.client import ExecClient

import pytest
import asyncio

# from customcmd.parser.context import ExecScope


@pytest.fixture
def grammar():
    with open("assets/grammar.ppeg") as f:
        return Grammar(f.read())


@pytest.fixture
def executor():
    return Execuitor()


@pytest.fixture
def context():
    ctx = ExecContext(
        alias='test_cmd',
        args=["testarg1", "testarg2"], content="Base content"
    )
    return ctx


@pytest.fixture
def client():
    return ExecClient()


class TestObject:
    _exec_attr_name = "testingobj"
    _exec_attr_number = 7

    async def _exec_attr_functor(self, ctx, arg1):
        return f"Rec {arg1}"

    async def _exec_attr_functown(self, ctx, arg1):
        return TestObject()

    def __call__(self, ctx, arg1):
        return self.dummy_call(ctx, arg1)

    async def dummy_call(self, ctx, arg1):
        return TestObject()

    def __str__(self):
        return "Testing Object"


class TestGrammar:
    async def run_command(self, grammar, executor, context, command):
        tree = grammar.parse(command)
        lazyterm = executor.visit(tree)
        return await lazyterm.execute(context)

    @pytest.mark.asyncio
    async def test_literals(self, grammar, executor, context):
        expected_results = [
            ('${""}', ""),
            ('${"abc"}', "abc"),
            ('${ "abc" }', "abc"),
            ("${1}", "1"),
            ("${True}", "True"),
            ("${False}", "False"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_ternary(self, grammar, executor, context):
        expected_results = [
            ('${"a"?"b":"c"}', "b"),
            ('${""?"b":"c"}', "c"),
            ('${ "a" ? "b" : "c" }', "b"),
            ('${ 1 ? "b" : "c" }', "b"),
            ('${ 0 ? "b" : "c" }', "c"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_cmdarg(self, grammar, executor, context):
        expected_results = [
            ("${$0}", "test_cmd"),
            ("${$1}", "testarg1"),
            ("${$1*}", "testarg1 testarg2"),
            ("${$3}", ""),
            ("${ $2 }", "testarg2"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_cascade(self, grammar, executor, context):
        expected_results = [
            ('${""|"result"}', "result"),
            ('${"first"|"result"}', "first"),
            ('${"first"|"second"|"result"}', "first"),
            ('${""|"second"|"result"}', "second"),
            ('${""|""|"result"}', "result"),
            ('${""|0|"result"}', "result"),
            ('${0|1|"result"}', "1"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_define_equals(self, grammar, executor, context):
        expected_results = [
            ("${a}", "a"),
            ("${(b = 1) | b}", "1"),
            ("${(d = 1) | (c = d) | c}", "1"),
            ("${(e = f) | (f = 1) | e}", "f"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_define_walrus(self, grammar, executor, context):
        expected_results = [
            ("${a}", "a"),
            ("${b := 1}", "1"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_define_term(self, grammar, executor, context):
        expected_results = [
            ("${a}", "a"),
            ("${(b ::= 1) | b}", "1"),
            ("${(d ::= 1) | (c ::= d) | c}", "1"),
            ("${(e ::= f) | (f ::= 1) | e}", "1"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_basic_obj(self, grammar, executor, context):
        context.this_scope["obj"] = TestObject()

        expected_results = [
            ("${obj}", "Testing Object"),
            ("${obj.name}", "testingobj"),
            ("${obj.number}", "7"),
            ('${obj.functor "abc"}', "Rec abc"),
            ("${(obj.functown abc).functor abc}", "Rec abc"),
            ("${(obj abc).functor abc}", "Rec abc"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_compare(self, grammar, executor, context):
        expected_results = [
            ("${1 == 1}", "True"),
            ("${1 != 2}", "True"),
            ("${1 <= 2}", "True"),
            ("${1 <= 1}", "True"),
            ("${1 < 2}", "True"),
            ("${1 > 2}", "False"),
            ("${1 >= 2}", "False"),
            ("${1 == 2}", "False"),
            ('${(1 == 2)?"a":"b"}', "b"),
            ('${(1 == 1)?"a":"b"}', "a"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_ops(self, grammar, executor, context):
        expected_results = [
            ("${1 + 1}", "2"),
            ("${1 + 2 + 3}", "6"),
            ("${1 - 1}", "0"),
            ("${4 / 2}", "2.0"),
            ("${5 % 2}", "1"),
            ("${5 * 2}", "10"),
            ("${5 * 2 * 3}", "30"),
            ("${5 // 2}", "2"),
            ("${2 ** 3}", "8"),
            ("${2 ** 3}", "8"),
            ("${True && False}", "False"),
            ("${True || False}", "True"),
            ("${True && True}", "True"),
            ("${False || False}", "False"),
            ('${"abc" + "def"}', "abcdef"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected

    @pytest.mark.asyncio
    async def test_compound(self, grammar, executor, context):
        expected_results = [
            ('${(a = 1) | (b = 1) | ((a == b)? 1 :"Failed")}', "1"),
        ]
        for command, expected in expected_results:
            actual = await self.run_command(grammar, executor, context, command)
            assert actual == expected


class TestClient:
    @pytest.mark.asyncio
    async def test_command_1(self, client, context):
        actual = await client.run_command(
            context, '${(a = 1) | (b = 1) | ((a == b)? 1 :"Failed")}'
        )
        assert actual == "1"

    @pytest.mark.asyncio
    async def test_command_2(self, client, context):
        actual = await client.run_command(context, "A test ${2} of the client ${$2}")
        assert actual == "A test 2 of the client testarg2"


class LaterTestScope:
    def test_scope_toplevel(self):
        scope = ExecScope() 
        scope['key'] = 'value'

        assert scope['key'] == 'value'
        

    def test_scope_stack(self):
        scope = ExecScope()
        scope['key'] = 'value1'

        scope.enter_scope()

        assert scope['key'] == 'value1'

        scope['key'] = 'value12'

        assert scope['key'] == 'value12'

        scope['key2'] = 'value2'

        assert scope['key2'] == 'value2'

        scope.leave_scope()

        assert scope.get('key2') is None
        assert scope['key'] == 'value'

    def test_scope_enter_init(self):
        scope = ExecScope(key="value1")

        assert scope['key'] == 'value1'

        scope.enter_scope(key2="value2")

        assert scope['key2'] == 'value2'

        scope.leave_scope()

        assert scope.get('key2') is None
        assert scope.get('key') == 'value1'