# Copyright 2017-2020 Palantir Technologies, Inc.
# Copyright 2021- Python Language Server Contributors.

import math
import os
import sys
from pathlib import Path
from typing import Dict, NamedTuple

import pytest

from pylsp import lsp, uris
from pylsp._utils import JEDI_VERSION
from pylsp.plugins.jedi_completion import (
    pylsp_completion_item_resolve as pylsp_jedi_completion_item_resolve,
)
from pylsp.plugins.jedi_completion import pylsp_completions as pylsp_jedi_completions
from pylsp.plugins.rope_completion import pylsp_completions as pylsp_rope_completions
from pylsp.workspace import Document

PY2 = sys.version[0] == "2"
LINUX = sys.platform.startswith("linux")
CI = os.environ.get("CI")
LOCATION = os.path.realpath(os.path.join(os.getcwd(), os.path.dirname(__file__)))
DOC_URI = uris.from_fs_path(__file__)
DOC = """import os
print os.path.isabs("/tmp")

def hello():
    pass

def _a_hello():
    pass

class Hello():

    @property
    def world(self):
        return None

    def everyone(self, a, b, c=None, d=2):
        pass

print Hello().world

print Hello().every

def documented_hello():
    \"\"\"Sends a polite greeting\"\"\"
    pass
"""


def test_rope_import_completion(config, workspace) -> None:
    com_position = {"line": 0, "character": 7}
    doc = Document(DOC_URI, workspace, DOC)
    items = pylsp_rope_completions(config, workspace, doc, com_position)
    assert items is None


class TypeCase(NamedTuple):
    document: str
    position: dict
    label: str
    expected: lsp.CompletionItemKind


TYPE_CASES: Dict[str, TypeCase] = {
    "variable": TypeCase(
        document="test = 1\ntes",
        position={"line": 1, "character": 3},
        label="test",
        expected=lsp.CompletionItemKind.Variable,
    ),
    "function": TypeCase(
        document="def test():\n    pass\ntes",
        position={"line": 2, "character": 3},
        label="test()",
        expected=lsp.CompletionItemKind.Function,
    ),
    "keyword": TypeCase(
        document="fro",
        position={"line": 0, "character": 3},
        label="from",
        expected=lsp.CompletionItemKind.Keyword,
    ),
    "file": TypeCase(
        document='"' + __file__[:-2].replace('"', '\\"') + '"',
        position={"line": 0, "character": len(__file__) - 2},
        label=Path(__file__).name + '"',
        expected=lsp.CompletionItemKind.File,
    ),
    "module": TypeCase(
        document="import statis",
        position={"line": 0, "character": 13},
        label="statistics",
        expected=lsp.CompletionItemKind.Module,
    ),
    "class": TypeCase(
        document="KeyErr",
        position={"line": 0, "character": 6},
        label="KeyError",
        expected=lsp.CompletionItemKind.Class,
    ),
    "property": TypeCase(
        document=(
            "class A:\n"
            "    @property\n"
            "    def test(self):\n"
            "        pass\n"
            "A().tes"
        ),
        position={"line": 4, "character": 5},
        label="test",
        expected=lsp.CompletionItemKind.Property,
    ),
}


@pytest.mark.parametrize("case", list(TYPE_CASES.values()), ids=list(TYPE_CASES.keys()))
def test_jedi_completion_type(case, config, workspace):
    # property support was introduced in 0.18
    if case.expected == lsp.CompletionItemKind.Property and JEDI_VERSION.startswith(
        "0.17"
    ):
        return

    doc = Document(DOC_URI, workspace, case.document)
    items = pylsp_jedi_completions(config, doc, case.position)
    items = {i["label"]: i for i in items}
    assert items[case.label]["kind"] == case.expected


def test_jedi_completion(config, workspace) -> None:
    # Over 'i' in os.path.isabs(...)
    com_position = {"line": 1, "character": 15}
    doc = Document(DOC_URI, workspace, DOC)
    items = pylsp_jedi_completions(config, doc, com_position)

    assert items
    labels = [i["label"] for i in items]
    assert "isfile(path)" in labels

    # Test we don't throw with big character
    pylsp_jedi_completions(config, doc, {"line": 1, "character": 1000})


def test_jedi_completion_item_resolve(config, workspace) -> None:
    # Over the blank line
    com_position = {"line": 8, "character": 0}
    doc = Document(DOC_URI, workspace, DOC)
    config.update({"plugins": {"jedi_completion": {"resolve_at_most": math.inf}}})
    completions = pylsp_jedi_completions(config, doc, com_position)

    items = {c["label"]: c for c in completions}

    documented_hello_item = items["documented_hello()"]

    assert "documentation" not in documented_hello_item
    assert "detail" not in documented_hello_item

    resolved_documented_hello = pylsp_jedi_completion_item_resolve(
        doc._config, completion_item=documented_hello_item, document=doc
    )
    expected_doc = {
        "kind": "markdown",
        "value": "```python\ndocumented_hello()\n```\n\n\nSends a polite greeting",
    }
    assert resolved_documented_hello["documentation"] == expected_doc


def test_jedi_completion_with_fuzzy_enabled(config, workspace) -> None:
    # Over 'i' in os.path.isabs(...)
    config.update({"plugins": {"jedi_completion": {"fuzzy": True}}})
    com_position = {"line": 1, "character": 15}
    doc = Document(DOC_URI, workspace, DOC)

    items = pylsp_jedi_completions(config, doc, com_position)

    assert items

    expected = "commonprefix(m)"
    if JEDI_VERSION == "0.18.0":
        expected = "commonprefix(list)"
    assert items[0]["label"] == expected

    # Test we don't throw with big character
    pylsp_jedi_completions(config, doc, {"line": 1, "character": 1000})


def test_jedi_completion_resolve_at_most(config, workspace) -> None:
    # Over 'i' in os.path.isabs(...)
    com_position = {"line": 1, "character": 15}
    doc = Document(DOC_URI, workspace, DOC)

    # Do not resolve any labels
    config.update({"plugins": {"jedi_completion": {"resolve_at_most": 0}}})
    items = pylsp_jedi_completions(config, doc, com_position)
    labels = {i["label"] for i in items}
    assert "isabs" in labels

    # Resolve all items
    config.update({"plugins": {"jedi_completion": {"resolve_at_most": math.inf}}})
    items = pylsp_jedi_completions(config, doc, com_position)
    labels = {i["label"] for i in items}
    assert "isfile(path)" in labels


def test_rope_completion(config, workspace) -> None:
    # Over 'i' in os.path.isabs(...)
    com_position = {"line": 1, "character": 15}
    workspace.put_document(DOC_URI, source=DOC)
    doc = workspace.get_document(DOC_URI)
    items = pylsp_rope_completions(config, workspace, doc, com_position)

    assert items
    assert items[0]["label"] == "isabs"


def test_jedi_completion_ordering(config, workspace) -> None:
    # Over the blank line
    com_position = {"line": 8, "character": 0}
    doc = Document(DOC_URI, workspace, DOC)
    config.update({"plugins": {"jedi_completion": {"resolve_at_most": math.inf}}})
    completions = pylsp_jedi_completions(config, doc, com_position)

    items = {c["label"]: c["sortText"] for c in completions}

    # And that 'hidden' functions come after unhidden ones
    assert items["hello()"] < items["_a_hello()"]


def test_jedi_property_completion(config, workspace) -> None:
    # Over the 'w' in 'print Hello().world'
    com_position = {"line": 18, "character": 15}
    doc = Document(DOC_URI, workspace, DOC)
    completions = pylsp_jedi_completions(config, doc, com_position)

    items = {c["label"]: c["sortText"] for c in completions}

    # Ensure we can complete the 'world' property
    assert "world" in list(items.keys())[0]


def test_jedi_method_completion(config, workspace) -> None:
    # Over the 'y' in 'print Hello().every'
    com_position = {"line": 20, "character": 19}
    doc = Document(DOC_URI, workspace, DOC)

    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update({"plugins": {"jedi_completion": {"include_params": True}}})

    completions = pylsp_jedi_completions(config, doc, com_position)
    everyone_method = [
        completion
        for completion in completions
        if completion["label"] == "everyone(a, b, c, d)"
    ][0]

    # Ensure we only generate snippets for positional args
    assert everyone_method["insertTextFormat"] == lsp.InsertTextFormat.Snippet
    assert everyone_method["insertText"] == "everyone(${1:a}, ${2:b})$0"

    # Disable param snippets
    config.update({"plugins": {"jedi_completion": {"include_params": False}}})

    completions = pylsp_jedi_completions(config, doc, com_position)
    everyone_method = [
        completion
        for completion in completions
        if completion["label"] == "everyone(a, b, c, d)"
    ][0]

    assert "insertTextFormat" not in everyone_method
    assert everyone_method["insertText"] == "everyone"


@pytest.mark.skipif(
    PY2 or (sys.platform.startswith("linux") and os.environ.get("CI") is not None),
    reason="Test in Python 3 and not on CIs on Linux because wheels don't work on them.",
)
def test_pyqt_completion(config, workspace) -> None:
    # Over 'QA' in 'from PyQt5.QtWidgets import QApplication'
    doc_pyqt = "from PyQt5.QtWidgets import QA"
    com_position = {"line": 0, "character": len(doc_pyqt)}
    doc = Document(DOC_URI, workspace, doc_pyqt)
    completions = pylsp_jedi_completions(config, doc, com_position)

    assert completions is not None


def test_numpy_completions(config, workspace) -> None:
    doc_numpy = "import numpy as np; np."
    com_position = {"line": 0, "character": len(doc_numpy)}
    doc = Document(DOC_URI, workspace, doc_numpy)
    items = pylsp_jedi_completions(config, doc, com_position)

    assert items
    assert any("array" in i["label"] for i in items)


def test_pandas_completions(config, workspace) -> None:
    doc_pandas = "import pandas as pd; pd."
    com_position = {"line": 0, "character": len(doc_pandas)}
    doc = Document(DOC_URI, workspace, doc_pandas)
    items = pylsp_jedi_completions(config, doc, com_position)

    assert items
    assert any("DataFrame" in i["label"] for i in items)


def test_matplotlib_completions(config, workspace) -> None:
    doc_mpl = "import matplotlib.pyplot as plt; plt."
    com_position = {"line": 0, "character": len(doc_mpl)}
    doc = Document(DOC_URI, workspace, doc_mpl)
    items = pylsp_jedi_completions(config, doc, com_position)

    assert items
    assert any("plot" in i["label"] for i in items)


def test_snippets_completion(config, workspace) -> None:
    doc_snippets = "from collections import defaultdict \na=defaultdict"
    com_position = {"line": 0, "character": 35}
    doc = Document(DOC_URI, workspace, doc_snippets)
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update({"plugins": {"jedi_completion": {"include_params": True}}})
    completions = pylsp_jedi_completions(config, doc, com_position)
    assert completions[0]["insertText"] == "defaultdict"

    com_position = {"line": 1, "character": len(doc_snippets)}
    completions = pylsp_jedi_completions(config, doc, com_position)
    assert completions[0]["insertText"] == "defaultdict($0)"
    assert completions[0]["insertTextFormat"] == lsp.InsertTextFormat.Snippet


def test_snippets_completion_at_most(config, workspace) -> None:
    doc_snippets = "from collections import defaultdict \na=defaultdict"
    doc = Document(DOC_URI, workspace, doc_snippets)
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update({"plugins": {"jedi_completion": {"include_params": True}}})
    config.update({"plugins": {"jedi_completion": {"resolve_at_most": 0}}})

    com_position = {"line": 1, "character": len(doc_snippets)}
    completions = pylsp_jedi_completions(config, doc, com_position)
    assert completions[0]["insertText"] == "defaultdict"
    assert not completions[0].get("insertTextFormat", None)


def test_completion_with_class_objects(config, workspace) -> None:
    doc_text = "class FOOBAR(Object): pass\nFOOB"
    com_position = {"line": 1, "character": 4}
    doc = Document(DOC_URI, workspace, doc_text)
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update(
        {
            "plugins": {
                "jedi_completion": {
                    "include_params": True,
                    "include_class_objects": True,
                }
            }
        }
    )
    completions = pylsp_jedi_completions(config, doc, com_position)
    assert len(completions) == 2

    assert completions[0]["label"] == "FOOBAR"
    assert completions[0]["kind"] == lsp.CompletionItemKind.Class

    assert completions[1]["label"] == "FOOBAR object"
    assert completions[1]["kind"] == lsp.CompletionItemKind.TypeParameter


def test_completion_with_function_objects(config, workspace) -> None:
    doc_text = "def foobar(): pass\nfoob"
    com_position = {"line": 1, "character": 4}
    doc = Document(DOC_URI, workspace, doc_text)
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update(
        {
            "plugins": {
                "jedi_completion": {
                    "include_params": True,
                    "include_function_objects": True,
                }
            }
        }
    )
    completions = pylsp_jedi_completions(config, doc, com_position)
    assert len(completions) == 2

    assert completions[0]["label"] == "foobar()"
    assert completions[0]["kind"] == lsp.CompletionItemKind.Function

    assert completions[1]["label"] == "foobar() object"
    assert completions[1]["kind"] == lsp.CompletionItemKind.TypeParameter


def test_snippet_parsing(config, workspace) -> None:
    doc = "divmod"
    completion_position = {"line": 0, "character": 6}
    doc = Document(DOC_URI, workspace, doc)
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update({"plugins": {"jedi_completion": {"include_params": True}}})
    completions = pylsp_jedi_completions(config, doc, completion_position)

    out = "divmod(${1:x}, ${2:y})$0"
    if JEDI_VERSION == "0.18.0":
        out = "divmod(${1:a}, ${2:b})$0"
    assert completions[0]["insertText"] == out


def test_multiline_import_snippets(config, workspace) -> None:
    document = "from datetime import(\n date,\n datetime)\na=date"
    doc = Document(DOC_URI, workspace, document)
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update({"plugins": {"jedi_completion": {"include_params": True}}})

    position = {"line": 1, "character": 5}
    completions = pylsp_jedi_completions(config, doc, position)
    assert completions[0]["insertText"] == "date"

    position = {"line": 2, "character": 9}
    completions = pylsp_jedi_completions(config, doc, position)
    assert completions[0]["insertText"] == "datetime"


def test_multiline_snippets(config, workspace) -> None:
    document = "from datetime import\\\n date,\\\n datetime \na=date"
    doc = Document(DOC_URI, workspace, document)
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update({"plugins": {"jedi_completion": {"include_params": True}}})

    position = {"line": 1, "character": 5}
    completions = pylsp_jedi_completions(config, doc, position)
    assert completions[0]["insertText"] == "date"

    position = {"line": 2, "character": 9}
    completions = pylsp_jedi_completions(config, doc, position)
    assert completions[0]["insertText"] == "datetime"


def test_multistatement_snippet(config, workspace) -> None:
    config.capabilities["textDocument"] = {
        "completion": {"completionItem": {"snippetSupport": True}}
    }
    config.update({"plugins": {"jedi_completion": {"include_params": True}}})

    document = "a = 1; from datetime import date"
    doc = Document(DOC_URI, workspace, document)
    position = {"line": 0, "character": len(document)}
    completions = pylsp_jedi_completions(config, doc, position)
    assert completions[0]["insertText"] == "date"

    document = "from math import fmod; a = fmod"
    doc = Document(DOC_URI, workspace, document)
    position = {"line": 0, "character": len(document)}
    completions = pylsp_jedi_completions(config, doc, position)
    assert completions[0]["insertText"] == "fmod(${1:x}, ${2:y})$0"


def test_jedi_completion_extra_paths(tmpdir, workspace) -> None:
    # Create a tempfile with some content and pass to extra_paths
    temp_doc_content = """
def spam():
    pass
"""
    p = tmpdir.mkdir("extra_path")
    extra_paths = [str(p)]
    p = p.join("foo.py")
    p.write(temp_doc_content)

    # Content of doc to test completion
    doc_content = """import foo
foo.s"""
    doc = Document(DOC_URI, workspace, doc_content)

    # After 'foo.s' without extra paths
    com_position = {"line": 1, "character": 5}
    completions = pylsp_jedi_completions(doc._config, doc, com_position)
    assert completions is None

    # Update config extra paths
    settings = {"pylsp": {"plugins": {"jedi": {"extra_paths": extra_paths}}}}
    doc.update_config(settings)

    # After 'foo.s' with extra paths
    com_position = {"line": 1, "character": 5}
    completions = pylsp_jedi_completions(doc._config, doc, com_position)
    assert completions[0]["label"] == "spam()"


@pytest.mark.skipif(
    PY2 or not LINUX or not CI, reason="tested on linux and python 3 only"
)
def test_jedi_completion_environment(workspace) -> None:
    # Content of doc to test completion
    doc_content = """import logh
"""
    doc = Document(DOC_URI, workspace, doc_content)

    # After 'import logh' with default environment
    com_position = {"line": 0, "character": 11}

    assert os.path.isdir("/tmp/pyenv/")

    settings = {"pylsp": {"plugins": {"jedi": {"environment": None}}}}
    doc.update_config(settings)
    completions = pylsp_jedi_completions(doc._config, doc, com_position)
    assert completions is None

    # Update config extra environment
    env_path = "/tmp/pyenv/bin/python"
    settings = {"pylsp": {"plugins": {"jedi": {"environment": env_path}}}}
    doc.update_config(settings)

    # After 'import logh' with new environment
    completions = pylsp_jedi_completions(doc._config, doc, com_position)
    assert completions[0]["label"] == "loghub"

    resolved = pylsp_jedi_completion_item_resolve(doc._config, completions[0], doc)
    assert "changelog generator" in resolved["documentation"]["value"].lower()


def test_document_path_completions(tmpdir, workspace_other_root_path) -> None:
    # Create a dummy module out of the workspace's root_path and try to get
    # completions for it in another file placed next to it.
    module_content = """
def foo():
    pass
"""

    p = tmpdir.join("mymodule.py")
    p.write(module_content)

    # Content of doc to test completion
    doc_content = """import mymodule
mymodule.f"""
    doc_path = str(tmpdir) + os.path.sep + "myfile.py"
    doc_uri = uris.from_fs_path(doc_path)
    doc = Document(doc_uri, workspace_other_root_path, doc_content)

    com_position = {"line": 1, "character": 10}
    completions = pylsp_jedi_completions(doc._config, doc, com_position)
    assert completions[0]["label"] == "foo()"


def test_file_completions(workspace, tmpdir) -> None:
    # Create directory and a file to get completions for them.
    # Note: `tmpdir`` is the root dir of the `workspace` fixture. That's why we use
    # it here.
    tmpdir.mkdir("bar")
    file = tmpdir.join("foo.txt")
    file.write("baz")

    # Content of doc to test completion
    doc_content = '"'
    doc = Document(DOC_URI, workspace, doc_content)

    # Request for completions
    com_position = {"line": 0, "character": 1}
    completions = pylsp_jedi_completions(doc._config, doc, com_position)

    # Check completions
    assert len(completions) == 2
    assert [c["kind"] == lsp.CompletionItemKind.File for c in completions]
    assert completions[0]["insertText"] == (
        ("bar" + "\\") if os.name == "nt" else ("bar" + "/")
    )
    assert completions[1]["insertText"] == 'foo.txt"'

    # When snippets are supported, ensure that path separators are escaped.
    support_snippet = {
        "textDocument": {"completion": {"completionItem": {"snippetSupport": True}}}
    }
    doc._config.capabilities.update(support_snippet)
    completions = pylsp_jedi_completions(doc._config, doc, com_position)
    assert completions[0]["insertText"] == (
        ("bar" + "\\\\") if os.name == "nt" else ("bar" + "\\/")
    )
    assert completions[1]["insertText"] == 'foo.txt"'
