import unittest
from datetime import datetime
import os

from sia.single_entry import SingleEntry

class SingleEntryTest(unittest.TestCase):
    def setUp(self):
        """Set up test cases with fixed id and timestamp"""
        self.test_id = "test-id-1234"
        self.test_timestamp = datetime(2024, 10, 31, 12, 0, 0)
        
        # Create a temporary file for testing
        self.test_filename = "test_output.txt"
        self.cleanup_files()
        
    def tearDown(self):
        """Clean up any test files"""
        self.cleanup_files()
        
    def cleanup_files(self):
        """Helper to remove test files"""
        if os.path.exists(self.test_filename):
            os.remove(self.test_filename)
            
    def test_initialization(self):
        """Test entry initialization"""
        script = "echo test"
        entry = SingleEntry(self.test_id, self.test_timestamp, script, None, None)
        
        self.assertEqual(entry.script, script)
        self.assertEqual(entry.stdout, "")
        self.assertEqual(entry.stderr, "")
        self.assertIsNone(entry.exit_code)
        self.assertEqual(entry.id, self.test_id)
        self.assertEqual(entry.timestamp, self.test_timestamp)
        self.assertFalse(entry._executed)
        
    def test_successful_execution(self):
        """Test successful script execution"""
        script = "echo 'test'"
            
        entry = SingleEntry(self.test_id, self.test_timestamp, script, None, None)
        entry.update()
        
        # Verify entry state
        self.assertEqual(entry.stdout.strip(), "test")
        self.assertEqual(entry.stderr, "")
        self.assertEqual(entry.exit_code, 0)
        self.assertTrue(entry._executed)
        
    def test_failed_execution(self):
        """Test failed script execution with invalid command"""
        entry = SingleEntry(self.test_id, self.test_timestamp, "nonexistentcommand", None, None)
        entry.update()
        
        # Verify entry state
        self.assertEqual(entry.stdout, "")
        self.assertTrue(len(entry.stderr) > 0)  # Error message will vary by OS
        self.assertNotEqual(entry.exit_code, 0)  # Exit code will be non-zero
        self.assertTrue(entry._executed)
        
    def test_file_creation(self):
        """Test script that creates a file"""
        script = f"echo 'test' > {self.test_filename}"
            
        entry = SingleEntry(self.test_id, self.test_timestamp, script, None, None)
        entry.update()
        
        # Verify file was created and contains expected content
        self.assertTrue(os.path.exists(self.test_filename))
        with open(self.test_filename, 'r') as f:
            content = f.read().strip()
            self.assertEqual(content, "test")
            
    def test_single_execution(self):
        """Test that script only executes once"""
        script = f"echo 'test' >> {self.test_filename}"
            
        entry = SingleEntry(self.test_id, self.test_timestamp, script, None, None)
        
        # Run update multiple times
        entry.update()
        entry.update()
        entry.update()
        
        # Verify file only contains one line
        with open(self.test_filename, 'r') as f:
            lines = f.readlines()
            self.assertEqual(len(lines), 1)
            self.assertEqual(lines[0].strip(), "test")
            
    def test_generate_context_before_execution(self):
        """Test XML context generation before execution"""
        entry = SingleEntry(self.test_id, self.test_timestamp, "echo test", None, None)
        element = entry.generate_context()
        
        # Verify XML structure
        self.assertEqual(element.tag, "single")
        self.assertEqual(element.get("id"), self.test_id)
        self.assertEqual(element.text, "echo test")
        
        # Verify no output elements exist
        self.assertIsNone(element.find("stdout"))
        self.assertIsNone(element.find("stderr"))
        self.assertIsNone(element.get("exit_code"))
        
    def test_generate_context_after_execution(self):
        """Test XML context generation after execution"""
        script = "echo 'test'"
            
        entry = SingleEntry(self.test_id, self.test_timestamp, script, None, None)
        entry.update()
        element = entry.generate_context()
        
        # Verify XML structure
        self.assertEqual(element.tag, "single")
        self.assertEqual(element.get("id"), self.test_id)
        self.assertEqual(element.text, f"{script}")
        
        # Get stdout and remove trailing newline for comparison
        stdout_text = element.find("stdout").text
        self.assertEqual(stdout_text, "test\n")
        self.assertEqual(element.find("stderr").text, "")
        self.assertEqual(element.get("exit_code"), "0")
        
    def test_multiple_commands(self):
        """Test executing multiple commands in one script"""
        script = f"echo 'first' > {self.test_filename} && echo 'second' >> {self.test_filename}"
            
        entry = SingleEntry(self.test_id, self.test_timestamp, script, None, None)
        entry.update()
        
        # Verify file contains both lines
        with open(self.test_filename, 'r') as f:
            lines = f.readlines()
            self.assertEqual(len(lines), 2)
            self.assertEqual(lines[0].strip(), "first")
            self.assertEqual(lines[1].strip(), "second")