import unittest
from datetime import datetime

from sia.web_io_buffer import WebIOBuffer
from sia.read_entry import ReadEntry

class ReadEntryTest(unittest.TestCase):
    def setUp(self):
        """Set up test cases with fixed id, timestamp, and IO buffer"""
        self.test_id = "test-id-1234"
        self.test_timestamp = datetime(2024, 10, 31, 12, 0, 0)
        self.io_buffer = WebIOBuffer()
        
    def test_initialization(self):
        """Test entry initialization"""
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        
        self.assertEqual(entry.content, "")
        self.assertEqual(entry.id, self.test_id)
        self.assertEqual(entry.timestamp, self.test_timestamp)
        
    def test_single_read(self):
        """Test reading content once"""
        test_input = "test message"
        self.io_buffer.append_stdin(test_input)
        
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        
        self.assertEqual(entry.content, test_input)
        self.assertEqual(self.io_buffer.buffer_length(), 0)
        
    def test_multiple_updates(self):
        """Test that content is only read once even with multiple updates"""
        test_input = "initial input"
        self.io_buffer.append_stdin(test_input)
        
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        initial_content = entry.content
        
        self.io_buffer.append_stdin("additional input")
        entry.update()
        entry.update()
        
        self.assertEqual(entry.content, initial_content)
        
    def test_empty_input(self):
        """Test reading when no input is available"""
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        
        self.assertEqual(entry.content, "")
        
    def test_special_characters(self):
        """Test reading content with special characters"""
        test_input = "Special chars: \n\t\r\'\"\\"
        self.io_buffer.append_stdin(test_input)
        
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        
        self.assertEqual(entry.content, test_input)
        
    def test_large_content(self):
        """Test reading large content"""
        test_input = "x" * 10000
        self.io_buffer.append_stdin(test_input)
        
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        
        self.assertEqual(entry.content, test_input)
        
    def test_generate_context_before_read(self):
        """Test XML context generation before reading"""
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        element = entry.generate_context()
        
        # Verify XML structure
        self.assertEqual(element.tag, "read_stdin")
        self.assertEqual(element.get("id"), self.test_id)
        self.assertIsNone(element.text)  # No content before read
        
    def test_generate_context_after_read(self):
        """Test XML context generation after reading"""
        test_input = "test message"
        self.io_buffer.append_stdin(test_input)
        
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        element = entry.generate_context()
        
        # Verify XML structure
        self.assertEqual(element.tag, "read_stdin")
        self.assertEqual(element.get("id"), self.test_id)
        self.assertEqual(element.text, f"{test_input}")
        
    def test_unicode_content(self):
        """Test reading Unicode content"""
        test_input = "Hello 世界 😊"
        self.io_buffer.append_stdin(test_input)
        
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        
        self.assertEqual(entry.content, test_input)
        
    def test_multiline_content(self):
        """Test reading multiline content"""
        test_input = """Line 1
        Line 2
        Line 3"""
        self.io_buffer.append_stdin(test_input)
        
        entry = ReadEntry(self.test_id, self.test_timestamp, self.io_buffer)
        entry.update()
        
        self.assertEqual(entry.content, test_input)
        
        # Verify XML escaping for multiline content
        element = entry.generate_context()
        self.assertEqual(element.text, f"{test_input}")