import sys
from unittest.mock import MagicMock

# This module needs the real agent-tool stack; importing it pulls in heavy
# DB/auth deps, so we stub those just long enough to import, then restore them.
# We deliberately do NOT pop src.tool_execution: popping and re-importing it
# rebinds the `src` package's `tool_execution` attribute, so a later
# `import src.tool_execution as te` resolves to a different module object than
# the one its functions live in - which silently breaks tests that monkeypatch
# it (e.g. test_edit_file's admin gate).
_ABSENT = object()
_AGENT_MODULES = ["src.agent_tools", "src.tool_parsing", "src.tool_schemas"]
_STUBBED = [
    "sqlalchemy", "sqlalchemy.orm", "sqlalchemy.ext", "sqlalchemy.ext.declarative",
    "sqlalchemy.ext.hybrid", "sqlalchemy.sql", "sqlalchemy.sql.expression",
    "src.database", "core.models", "core.database", "core.auth",
]
_saved_stubs = {name: sys.modules.get(name, _ABSENT) for name in _STUBBED}

for _mod in _AGENT_MODULES:
    sys.modules.pop(_mod, None)
for _mod in _STUBBED:
    if _mod not in sys.modules:
        sys.modules[_mod] = MagicMock()

import pytest  # noqa: E402
import src.agent_tools  # noqa: E402,F401
from src.tool_schemas import function_call_to_tool_block  # noqa: E402

# Drop the stubs we installed so they do not leak into later tests.
for _name, _original in _saved_stubs.items():
    if _original is _ABSENT:
        sys.modules.pop(_name, None)
    else:
        sys.modules[_name] = _original


@pytest.mark.parametrize("arguments", [
    '["ls -la"]',   # JSON array
    '"ls -la"',     # bare JSON string
    '42',            # JSON number
    'true',          # JSON bool
    'null',          # JSON null
])
def test_non_object_arguments_do_not_crash(arguments):
    """A native function call whose arguments are valid JSON but not an object
    must not raise (it used to throw AttributeError: 'list' object has no
    attribute 'get', aborting the entire agent stream)."""
    block = function_call_to_tool_block("bash", arguments)
    # Coerced to empty args -> empty bash command, but importantly NO crash.
    assert block is not None
    assert block.tool_type == "bash"
    assert block.content == ""


def test_edit_document_skips_non_object_edit_items():
    block = function_call_to_tool_block(
        "edit_document",
        '{"edits": ["bad", 42, null, {"find": "old", "replace": "new"}]}',
    )

    assert block is not None
    assert block.tool_type == "edit_document"
    assert block.content == "<<<FIND>>>\nold\n<<<REPLACE>>>\nnew\n<<<END>>>"


def test_suggest_document_skips_non_object_suggestion_items():
    block = function_call_to_tool_block(
        "suggest_document",
        '{"suggestions": ["bad", 42, null, {"find": "old", "replace": "new", "reason": "clearer"}]}',
    )

    assert block is not None
    assert block.tool_type == "suggest_document"
    assert block.content == (
        "<<<FIND>>>\nold\n<<<SUGGEST>>>\nnew\n<<<REASON>>>\nclearer\n<<<END>>>"
    )