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from typing import List, Optional

from pygls.lsp.methods import (
    TEXT_DOCUMENT_CALL_HIERARCHY_INCOMING_CALLS,
    TEXT_DOCUMENT_CALL_HIERARCHY_OUTGOING_CALLS,
    TEXT_DOCUMENT_CALL_HIERARCHY_PREPARE
)
from pygls.lsp.types import (
    CallHierarchyIncomingCall, CallHierarchyIncomingCallsParams,
    CallHierarchyItem, CallHierarchyOptions, CallHierarchyOutgoingCall,
    CallHierarchyOutgoingCallsParams, CallHierarchyPrepareParams,
    Position, Range, SymbolKind, SymbolTag, TextDocumentIdentifier
)

from ..conftest import ClientServer

CALL_HIERARCHY_ITEM = CallHierarchyItem(
    name="test_name",
    kind=SymbolKind.File,
    uri="test_uri",
    range=Range(
        start=Position(line=0, character=0),
        end=Position(line=1, character=1),
    ),
    selection_range=Range(
        start=Position(line=1, character=1),
        end=Position(line=2, character=2),
    ),
    tags=[SymbolTag.Deprecated],
    detail="test_detail",
    data="test_data",
)


def check_call_hierarchy_item_response(item):
    assert item['name'] == 'test_name'
    assert item['kind'] == SymbolKind.File
    assert item['uri'] == 'test_uri'
    assert item['range']['start']['line'] == 0
    assert item['range']['start']['character'] == 0
    assert item['range']['end']['line'] == 1
    assert item['range']['end']['character'] == 1
    assert item['selectionRange']['start']['line'] == 1
    assert item['selectionRange']['start']['character'] == 1
    assert item['selectionRange']['end']['line'] == 2
    assert item['selectionRange']['end']['character'] == 2
    assert len(item['tags']) == 1
    assert item['tags'][0] == SymbolTag.Deprecated
    assert item['detail'] == 'test_detail'
    assert item['data'] == 'test_data'


class ConfiguredLS(ClientServer):
    def __init__(self):
        super().__init__()

        @self.server.feature(
            TEXT_DOCUMENT_CALL_HIERARCHY_PREPARE,
            CallHierarchyOptions(),
        )
        def f1(
            params: CallHierarchyPrepareParams
        ) -> Optional[List[CallHierarchyItem]]:
            if params.text_document.uri == 'file://return.list':
                return [CALL_HIERARCHY_ITEM]
            else:
                return None

        @self.server.feature(TEXT_DOCUMENT_CALL_HIERARCHY_INCOMING_CALLS)
        def f2(
            params: CallHierarchyIncomingCallsParams
        ) -> Optional[List[CallHierarchyIncomingCall]]:
            return [
                CallHierarchyIncomingCall(
                    from_=params.item,
                    from_ranges=[
                        Range(
                            start=Position(line=2, character=2),
                            end=Position(line=3, character=3),
                        ),
                    ],
                ),
            ]

        @self.server.feature(TEXT_DOCUMENT_CALL_HIERARCHY_OUTGOING_CALLS)
        def f3(
            params: CallHierarchyOutgoingCallsParams
        ) -> Optional[List[CallHierarchyOutgoingCall]]:
            return [
                CallHierarchyOutgoingCall(
                    to=params.item,
                    from_ranges=[
                        Range(
                            start=Position(line=3, character=3),
                            end=Position(line=4, character=4),
                        ),
                    ],
                ),
            ]


@ConfiguredLS.decorate()
def test_capabilities(client_server):
    _, server = client_server
    capabilities = server.server_capabilities
    assert capabilities.call_hierarchy_provider


@ConfiguredLS.decorate()
def test_call_hierarchy_prepare_return_list(client_server):
    client, _ = client_server
    response = client.lsp.send_request(
        TEXT_DOCUMENT_CALL_HIERARCHY_PREPARE,
        CallHierarchyPrepareParams(
            text_document=TextDocumentIdentifier(uri='file://return.list'),
            position=Position(line=0, character=0),
        )
    ).result()

    check_call_hierarchy_item_response(response[0])


@ConfiguredLS.decorate()
def test_call_hierarchy_prepare_return_none(client_server):
    client, _ = client_server
    response = client.lsp.send_request(
        TEXT_DOCUMENT_CALL_HIERARCHY_PREPARE,
        CallHierarchyPrepareParams(
            text_document=TextDocumentIdentifier(uri='file://return.none'),
            position=Position(line=0, character=0),
        )
    ).result()

    assert response is None


@ConfiguredLS.decorate()
def test_call_hierarchy_incoming_calls_return_list(client_server):
    client, _ = client_server
    response = client.lsp.send_request(
        TEXT_DOCUMENT_CALL_HIERARCHY_INCOMING_CALLS,
        CallHierarchyIncomingCallsParams(item=CALL_HIERARCHY_ITEM)
    ).result()

    item = response[0]

    check_call_hierarchy_item_response(item['from'])

    assert item['fromRanges'][0]['start']['line'] == 2
    assert item['fromRanges'][0]['start']['character'] == 2
    assert item['fromRanges'][0]['end']['line'] == 3
    assert item['fromRanges'][0]['end']['character'] == 3


@ConfiguredLS.decorate()
def test_call_hierarchy_outgoing_calls_return_list(client_server):
    client, _ = client_server
    response = client.lsp.send_request(
        TEXT_DOCUMENT_CALL_HIERARCHY_OUTGOING_CALLS,
        CallHierarchyOutgoingCallsParams(item=CALL_HIERARCHY_ITEM)
    ).result()

    item = response[0]

    check_call_hierarchy_item_response(item['to'])

    assert item['fromRanges'][0]['start']['line'] == 3
    assert item['fromRanges'][0]['start']['character'] == 3
    assert item['fromRanges'][0]['end']['line'] == 4
    assert item['fromRanges'][0]['end']['character'] == 4
