import unittest
from datetime import datetime
import os

from sia.repeat_entry import RepeatEntry

class RepeatEntryTest(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.counter_file = "counter.txt"
        self.cleanup_files()
        
    def tearDown(self):
        """Clean up any test files"""
        self.cleanup_files()
        
    def cleanup_files(self):
        """Helper to remove test files"""
        for filename in [self.test_filename, self.counter_file]:
            if os.path.exists(filename):
                os.remove(filename)
            
    def test_initialization(self):
        """Test entry initialization"""
        script = "echo test"
        entry = RepeatEntry(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)
        
    def test_successful_execution(self):
        """Test successful script execution"""
        script = "echo 'test'"
        entry = RepeatEntry(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)
        
    def test_failed_execution(self):
        """Test failed script execution with invalid command"""
        entry = RepeatEntry(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
        
    def test_repeated_execution(self):
        """Test that script executes on every update"""
        # Create a counter file
        with open(self.counter_file, 'w') as f:
            f.write('0')
            
        # Script that increments and reads the counter
        script = (
            f'python3 -c "'
            f'import os; '
            f'f=open(\'{self.counter_file}\', \'r+\'); '
            f'n=int(f.read()); '
            f'f.seek(0); '
            f'f.write(str(n+1)); '
            f'f.truncate(); '
            f'f.close(); '
            f'print(n+1)'
            f'"'
        )
        
        entry = RepeatEntry(self.test_id, self.test_timestamp, script, None, None)
        
        # Run update multiple times
        outputs = []
        for _ in range(3):
            entry.update()
            outputs.append(int(entry.stdout.strip()))
            
        # Verify outputs are sequential numbers
        self.assertEqual(outputs, [1, 2, 3])
            
    def test_generate_context(self):
        """Test XML context generation"""
        script = "echo 'test'"
        entry = RepeatEntry(self.test_id, self.test_timestamp, script, None, None)
        entry.update()
        element = entry.generate_context()
        # Verify XML structure
        self.assertEqual(element.tag, "repeat")
        self.assertEqual(element.get("id"), self.test_id)
        self.assertEqual(element.text, script)
        self.assertEqual(element.get("exit_code"), "0")
        stdout_text = element.find("stdout").text
        self.assertEqual(stdout_text, "test\n")
        self.assertEqual(element.find("stderr").text, "")
        
    def test_changing_output(self):
        """Test handling of changing command output"""
        # Create a counter file
        with open(self.counter_file, 'w') as f:
            f.write('0')
            
        # Script that outputs an incrementing number
        script = (
            f'python3 -c "'
            f'import os; '
            f'f=open(\'{self.counter_file}\', \'r+\'); '
            f'n=int(f.read()); '
            f'f.seek(0); '
            f'f.write(str(n+1)); '
            f'f.truncate(); '
            f'f.close(); '
            f'print(\'Output\', n+1)'
            f'"'
        )
        
        entry = RepeatEntry(self.test_id, self.test_timestamp, script, None, None)
        
        # Execute multiple times and verify output changes
        entry.update()
        first_output = entry.stdout.strip()
        
        entry.update()
        second_output = entry.stdout.strip()
        
        entry.update()
        third_output = entry.stdout.strip()
        
        # Outputs should be different for each run
        outputs = [first_output, second_output, third_output]
        unique_outputs = set(outputs)
        self.assertEqual(len(unique_outputs), 3)
        self.assertEqual(outputs, ['Output 1', 'Output 2', 'Output 3'])