import pytest
import os
import tempfile
from pr.tools.filesystem import read_file, write_file, list_directory, search_replace
from pr.tools.patch import apply_patch, create_diff
from pr.tools.base import get_tools_definition


class TestFilesystemTools:

    def test_write_and_read_file(self, temp_dir):
        filepath = os.path.join(temp_dir, 'test.txt')
        content = 'Hello, World!'

        write_result = write_file(filepath, content)
        assert write_result['status'] == 'success'

        read_result = read_file(filepath)
        assert read_result['status'] == 'success'
        assert content in read_result['content']

    def test_read_nonexistent_file(self):
        result = read_file('/nonexistent/path/file.txt')
        assert result['status'] == 'error'

    def test_list_directory(self, temp_dir):
        test_file = os.path.join(temp_dir, 'testfile.txt')
        with open(test_file, 'w') as f:
            f.write('test')

        result = list_directory(temp_dir)
        assert result['status'] == 'success'
        assert any(item['name'] == 'testfile.txt' for item in result['items'])

    def test_search_replace(self, temp_dir):
        filepath = os.path.join(temp_dir, 'test.txt')
        content = 'Hello, World!'
        with open(filepath, 'w') as f:
            f.write(content)

        result = search_replace(filepath, 'World', 'Universe')
        assert result['status'] == 'success'

        read_result = read_file(filepath)
        assert 'Hello, Universe!' in read_result['content']


class TestPatchTools:

    def test_create_diff(self, temp_dir):
        file1 = os.path.join(temp_dir, 'file1.txt')
        file2 = os.path.join(temp_dir, 'file2.txt')
        with open(file1, 'w') as f:
            f.write('line1\nline2\nline3\n')
        with open(file2, 'w') as f:
            f.write('line1\nline2 modified\nline3\n')

        result = create_diff(file1, file2)
        assert result['status'] == 'success'
        assert 'line2' in result['diff']
        assert 'line2 modified' in result['diff']

    def test_apply_patch(self, temp_dir):
        filepath = os.path.join(temp_dir, 'file.txt')
        with open(filepath, 'w') as f:
            f.write('line1\nline2\nline3\n')

        # Create a simple patch
        patch_content = """--- a/file.txt
+++ b/file.txt
@@ -1,3 +1,3 @@
 line1
-line2
+line2 modified
 line3
"""
        result = apply_patch(filepath, patch_content)
        assert result['status'] == 'success'

        read_result = read_file(filepath)
        assert 'line2 modified' in read_result['content']


class TestToolDefinitions:

    def test_get_tools_definition_returns_list(self):
        tools = get_tools_definition()
        assert isinstance(tools, list)
        assert len(tools) > 0

    def test_all_tools_have_required_fields(self):
        tools = get_tools_definition()

        for tool in tools:
            assert 'type' in tool
            assert tool['type'] == 'function'
            assert 'function' in tool

            func = tool['function']
            assert 'name' in func
            assert 'description' in func
            assert 'parameters' in func

    def test_filesystem_tools_present(self):
        tools = get_tools_definition()
        tool_names = [t['function']['name'] for t in tools]

        assert 'read_file' in tool_names
        assert 'write_file' in tool_names
        assert 'list_directory' in tool_names
        assert 'search_replace' in tool_names

    def test_patch_tools_present(self):
        tools = get_tools_definition()
        tool_names = [t['function']['name'] for t in tools]

        assert 'apply_patch' in tool_names
        assert 'create_diff' in tool_names