import pytest
from pathlib import Path
from src.tools.file_ops import FileOperations

def test_file_operations_read_scope(tmp_path):
    ops = FileOperations(repo_root=str(tmp_path))
    test_file = tmp_path / "sample.py"
    test_file.write_text("line one\nline two\nline three\n", encoding="utf-8")
    
    res = ops.read_scope("sample.py", 1, 2)
    assert res["status"] == "success"
    assert res["total_lines"] == 3
    assert "line one" in res["content"]
    assert "line two" in res["content"]

def test_file_operations_read_scope_not_found(tmp_path):
    ops = FileOperations(repo_root=str(tmp_path))
    res = ops.read_scope("nonexistent.py", 1, 5)
    assert res["status"] == "error"
    assert "not found" in res["message"]

def test_file_operations_read_scope_generic_exception(tmp_path, monkeypatch):
    ops = FileOperations(repo_root=str(tmp_path))
    test_file = tmp_path / "error.py"
    test_file.write_text("content", encoding="utf-8")
    
    def mock_read_text(*args, **kwargs):
        raise RuntimeError("Simulated read failure")
        
    monkeypatch.setattr("pathlib.Path.read_text", mock_read_text)
    res = ops.read_scope("error.py", 1, 2)
    assert res["status"] == "error"
    assert "Simulated read failure" in res["message"]

def test_file_operations_patch_file(tmp_path):
    ops = FileOperations(repo_root=str(tmp_path))
    test_file = tmp_path / "target.py"
    test_file.write_text("def hello():\n    return 'old'\n", encoding="utf-8")
    
    res = ops.patch_file("target.py", "return 'old'", "return 'new'")
    assert res["status"] == "success"
    
    updated_content = test_file.read_text(encoding="utf-8")
    assert "return 'new'" in updated_content

def test_file_operations_patch_file_missing_target(tmp_path):
    ops = FileOperations(repo_root=str(tmp_path))
    test_file = tmp_path / "target.py"
    test_file.write_text("def hello():\n    return 'old'\n", encoding="utf-8")
    
    res = ops.patch_file("target.py", "nonexistent_code", "replacement")
    assert res["status"] == "error"
    assert "Target code block not found" in res["message"]

def test_file_operations_patch_file_exception(tmp_path):
    ops = FileOperations(repo_root=str(tmp_path))
    sub_dir = tmp_path / "subdir"
    sub_dir.mkdir()
    res = ops.patch_file("subdir", "target", "replacement")
    assert res["status"] == "error"

def test_file_operations_path_traversal_security(tmp_path):
    ops = FileOperations(repo_root=str(tmp_path))
    res = ops.read_scope("../outside_file.py", 1, 5)
    assert res["status"] == "error"
    assert "Access denied" in res["message"]


def test_patch_file_not_found(tmp_path):
    from src.tools.file_ops import FileOperations
    ops = FileOperations(repo_root=str(tmp_path))
    res = ops.patch_file("nonexistent.py", "target", "replacement")
    assert res["status"] == "error"
    assert "not found" in res["message"]