"""
Tests for semicolon-separated statement functionality in Dana interpreter.

These tests verify that the DanaInterpreter can handle semicolon-separated statements
with proper indentation normalization and execution.

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MIT License

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"""

import pytest

from dana.core.lang.interpreter.dana_interpreter import DanaInterpreter
from dana.core.lang.sandbox_context import SandboxContext


def run_semicolon_code(code):
    """Run Dana code with semicolon-separated statements and return the context.

    Args:
        code: The semicolon-separated code to run

    Returns:
        The runtime context after execution
    """
    context = SandboxContext()
    interpreter = DanaInterpreter()
    interpreter.execute_statement(code, context)
    return context


# --- Basic Semicolon Separation ---
def test_basic_semicolon_separation():
    """Test basic semicolon-separated statements."""
    context = run_semicolon_code("x = 1 ; y = 2 ; z = 3")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2
    assert context.get("local:z") == 3


def test_semicolon_with_whitespace():
    """Test semicolon separation with various whitespace patterns."""
    context = run_semicolon_code("x = 1  ;   y = 2")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


def test_semicolon_with_tabs():
    """Test semicolon separation with tabs and mixed whitespace."""
    context = run_semicolon_code("x = 1\t; y = 2")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


# --- Whitespace Handling ---
def test_whitespace_handling_basic():
    """Test basic whitespace handling in semicolon-separated statements."""
    context = run_semicolon_code("x = 1 ; y = 2")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


def test_whitespace_handling_extra_spaces():
    """Test whitespace handling with extra spaces before and after semicolon."""
    context = run_semicolon_code("x = 1  ;   y = 2")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


def test_whitespace_handling_tabs():
    """Test whitespace handling with tabs and mixed whitespace."""
    context = run_semicolon_code("x = 1\t; y = 2")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


# --- Complex Statements ---
def test_semicolon_with_expressions():
    """Test semicolon separation with complex expressions."""
    context = run_semicolon_code("x = 2 + 3 ; y = x * 2 ; z = y - 1")
    assert context.get("local:x") == 5
    assert context.get("local:y") == 10
    assert context.get("local:z") == 9


def test_semicolon_with_strings():
    """Test semicolon separation with string literals."""
    context = run_semicolon_code('x = "hello" ; y = "world" ; z = x + " " + y')
    assert context.get("local:x") == "hello"
    assert context.get("local:y") == "world"
    assert context.get("local:z") == "hello world"


def test_semicolon_with_lists():
    """Test semicolon separation with list operations."""
    context = run_semicolon_code("x = [1, 2, 3] ; y = x[0] ; z = len(x)")
    assert context.get("local:x") == [1, 2, 3]
    assert context.get("local:y") == 1
    assert context.get("local:z") == 3


# --- Control Flow with Semicolons ---
def test_semicolon_with_conditionals():
    """Test semicolon separation with conditional statements."""
    context = run_semicolon_code("x = 5 ; if x > 3 :\n    result = 'high'\nelse :\n    result = 'low'")
    assert context.get("local:x") == 5
    assert context.get("local:result") == "high"


def test_semicolon_with_loops():
    """Test semicolon separation with loop statements."""
    context = run_semicolon_code("sum = 0 ; i = 0 ; while i < 3 :\n    sum = sum + i\n    i = i + 1")
    assert context.get("local:sum") == 3  # 0 + 1 + 2
    assert context.get("local:i") == 3


# --- Function Calls with Semicolons ---
def test_semicolon_with_function_calls():
    """Test semicolon separation with function calls."""
    context = run_semicolon_code("x = len([1, 2, 3]) ; y = str(x) ; z = int(y) + 1")
    assert context.get("local:x") == 3
    assert context.get("local:y") == "3"
    assert context.get("local:z") == 4


# --- Edge Cases ---
def test_semicolon_no_space_before():
    """Test that semicolon without space before is not processed as semicolon-separated."""
    context = SandboxContext()
    interpreter = DanaInterpreter()
    # This should fail to parse because Dana doesn't support semicolons without spaces
    from lark.exceptions import UnexpectedCharacters

    with pytest.raises(UnexpectedCharacters):
        interpreter.execute_statement("x = 1; y = 2", context)


def test_semicolon_empty_parts():
    """Test semicolon separation with empty parts."""
    context = run_semicolon_code("x = 1 ;   ; y = 2")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


def test_semicolon_only_whitespace_parts():
    """Test semicolon separation with parts that are only whitespace."""
    context = run_semicolon_code("x = 1 ;     ; y = 2")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


def test_semicolon_trailing_whitespace():
    """Test semicolon separation with trailing whitespace."""
    context = run_semicolon_code("x = 1 ; y = 2  ")
    assert context.get("local:x") == 1
    assert context.get("local:y") == 2


# --- Return Values ---
def test_semicolon_return_value():
    """Test that semicolon-separated statements return the value of the last statement."""
    context = SandboxContext()
    interpreter = DanaInterpreter()
    result = interpreter.execute_statement("x = 1 ; y = 2 ; z = 3", context)
    assert result == 3  # Should return the value of the last statement


def test_semicolon_return_value_with_expressions():
    """Test return value with expressions in semicolon-separated statements."""
    context = SandboxContext()
    interpreter = DanaInterpreter()
    result = interpreter.execute_statement("x = 1 ; y = x + 1 ; z = y * 2", context)
    assert result == 4  # Should return the value of the last expression (y * 2 = 2 * 2 = 4)


# --- Error Handling ---
def test_semicolon_with_syntax_error():
    """Test semicolon separation with syntax errors."""
    from lark.exceptions import UnexpectedToken

    with pytest.raises(UnexpectedToken):
        run_semicolon_code("x = 1 ; y = ; z = 3")


def test_semicolon_with_runtime_error():
    """Test semicolon separation with runtime errors."""
    context = run_semicolon_code("x = 1 ; y = undefined_variable ; z = 3")
    # In Dana, undefined variables are treated as None, not as errors
    assert context.get("local:x") == 1
    assert context.get("local:y") is None
    assert context.get("local:z") == 3


# --- Integration with Normal Execution ---
def test_mixed_semicolon_and_normal():
    """Test that semicolon-separated statements work alongside normal execution."""
    context = SandboxContext()
    interpreter = DanaInterpreter()

    # Execute normal statement
    interpreter.execute_statement("x = 1", context)
    assert context.get("local:x") == 1

    # Execute semicolon-separated statement
    interpreter.execute_statement("y = 2 ; z = 3", context)
    assert context.get("local:y") == 2
    assert context.get("local:z") == 3

    # Execute another normal statement
    interpreter.execute_statement("w = 4", context)
    assert context.get("local:w") == 4


# --- Performance and Memory ---
def test_semicolon_large_number_of_statements():
    """Test semicolon separation with a large number of statements."""
    statements = []
    for i in range(100):
        statements.append(f"x{i} = {i}")

    code = " ; ".join(statements)
    context = run_semicolon_code(code)

    # Verify all variables were set
    for i in range(100):
        assert context.get(f"local:x{i}") == i


def test_semicolon_memory_cleanup():
    """Test that semicolon-separated statements don't leak memory."""
    context = SandboxContext()
    interpreter = DanaInterpreter()

    # Execute multiple semicolon-separated statements
    for i in range(10):
        interpreter.execute_statement(f"x{i} = {i} ; y{i} = {i * 2}", context)

    # Verify execution completed without memory issues
    assert context.get("local:x9") == 9
    assert context.get("local:y9") == 18
