"""
Unit tests for ScriptSkyvernPage.

Tests _wait_for_page_ready_before_action (regression test for self._page bug, PR #8425),
_ensure_element_ids_on_page (injects unique_id attrs after page navigation),
and terminate() (raises ScriptTerminationException for Code 2.0 cached execution).
"""

import inspect
import re
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from skyvern.config import settings
from skyvern.core.script_generations.script_skyvern_page import ScriptSkyvernPage
from skyvern.exceptions import ScriptTerminationException


def create_mock_page():
    """Create a mock Playwright Page object with required attributes."""
    page = MagicMock()
    page.url = "https://example.com"
    # Required for Playwright Page base class
    page._loop = MagicMock()
    page._impl_obj = page
    return page


@pytest.fixture
def mock_scraped_page():
    """Create a mock ScrapedPage object."""
    scraped_page = MagicMock()
    scraped_page._browser_state = MagicMock()
    return scraped_page


@pytest.fixture
def mock_ai():
    """Create a mock SkyvernPageAi object."""
    return MagicMock()


@pytest.mark.asyncio
async def test_wait_for_page_ready_before_action_calls_skyvern_frame(mock_scraped_page, mock_ai):
    """
    Test that _wait_for_page_ready_before_action correctly calls SkyvernFrame.

    This is a regression test for the bug in PR #8273 where self._page was used
    instead of self.page, causing AttributeError because SkyvernPage stores the
    Playwright page in self.page.
    """
    mock_page = create_mock_page()

    # Patch the Page base class to avoid Playwright internals
    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        # Create ScriptSkyvernPage instance
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        # Mock SkyvernFrame to verify it's called with self.page
        mock_skyvern_frame = MagicMock()
        mock_skyvern_frame.wait_for_page_ready = AsyncMock()

        with patch(
            "skyvern.core.script_generations.script_skyvern_page.SkyvernFrame.create_instance",
            new_callable=AsyncMock,
            return_value=mock_skyvern_frame,
        ) as mock_create_instance:
            await script_page._wait_for_page_ready_before_action()

            # Verify SkyvernFrame.create_instance was called exactly once
            mock_create_instance.assert_called_once()

            # Get the actual call argument
            call_kwargs = mock_create_instance.call_args.kwargs
            assert "frame" in call_kwargs, "create_instance should be called with frame argument"
            # The frame argument should be a MagicMock (the page object)
            assert call_kwargs["frame"] is not None, "frame should not be None"

            # Verify wait_for_page_ready was called with correct settings
            mock_skyvern_frame.wait_for_page_ready.assert_called_once_with(
                network_idle_timeout_ms=settings.PAGE_READY_NETWORK_IDLE_TIMEOUT_MS,
                loading_indicator_timeout_ms=settings.PAGE_READY_LOADING_INDICATOR_TIMEOUT_MS,
                dom_stable_ms=settings.PAGE_READY_DOM_STABLE_MS,
                dom_stability_timeout_ms=settings.PAGE_READY_DOM_STABILITY_TIMEOUT_MS,
            )


@pytest.mark.asyncio
async def test_wait_for_page_ready_before_action_handles_no_page(mock_scraped_page, mock_ai):
    """
    Test that _wait_for_page_ready_before_action returns early if self.page is None.
    """
    # Patch the Page base class to avoid Playwright internals
    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        # Create a mock page first, then set page to None after construction
        mock_page = create_mock_page()
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )
        # Simulate page being None (e.g., after page was closed)
        script_page.page = None

        # This should return early without raising an error
        with patch(
            "skyvern.core.script_generations.script_skyvern_page.SkyvernFrame.create_instance",
            new_callable=AsyncMock,
        ) as mock_create_instance:
            await script_page._wait_for_page_ready_before_action()

            # SkyvernFrame.create_instance should NOT be called
            mock_create_instance.assert_not_called()


@pytest.mark.asyncio
async def test_wait_for_page_ready_before_action_catches_exceptions(mock_scraped_page, mock_ai):
    """
    Test that exceptions in _wait_for_page_ready_before_action are caught
    and don't block action execution.

    This verifies the defensive behavior - page readiness check failures
    should not prevent actions from executing.
    """
    mock_page = create_mock_page()

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        # Make SkyvernFrame.create_instance raise an exception
        with patch(
            "skyvern.core.script_generations.script_skyvern_page.SkyvernFrame.create_instance",
            new_callable=AsyncMock,
            side_effect=Exception("Simulated page readiness error"),
        ):
            # Should NOT raise - exception should be caught
            await script_page._wait_for_page_ready_before_action()


@pytest.mark.asyncio
async def test_wait_for_page_ready_before_action_catches_wait_for_page_ready_exceptions(mock_scraped_page, mock_ai):
    """
    Test that exceptions from wait_for_page_ready are caught and logged.
    """
    mock_page = create_mock_page()

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        # Make wait_for_page_ready raise an exception
        mock_skyvern_frame = MagicMock()
        mock_skyvern_frame.wait_for_page_ready = AsyncMock(side_effect=TimeoutError("Page never became idle"))

        with patch(
            "skyvern.core.script_generations.script_skyvern_page.SkyvernFrame.create_instance",
            new_callable=AsyncMock,
            return_value=mock_skyvern_frame,
        ):
            # Should NOT raise - exception should be caught
            await script_page._wait_for_page_ready_before_action()


@pytest.mark.asyncio
async def test_wait_for_page_ready_attribute_access_regression():
    """
    Regression test: Verify that the code accesses self.page, not self._page.

    The original bug (fixed in PR #8425) used self._page which caused:
    AttributeError: 'ScriptSkyvernPage' object has no attribute '_page'

    This test directly inspects the source code to ensure self._page is not used.
    """
    source = inspect.getsource(ScriptSkyvernPage._wait_for_page_ready_before_action)

    # The fixed code should use self.page
    assert "self.page" in source, "Method should access self.page"

    # The fixed code should NOT use self._page (except in comments)
    # Remove comments and docstrings first
    # Remove docstrings
    source_no_docstrings = re.sub(r'""".*?"""', "", source, flags=re.DOTALL)
    source_no_docstrings = re.sub(r"'''.*?'''", "", source_no_docstrings, flags=re.DOTALL)
    # Remove single-line comments
    source_no_comments = re.sub(r"#.*$", "", source_no_docstrings, flags=re.MULTILINE)

    # Now check - self._page should NOT appear in the actual code
    # (It may appear in comments explaining the fix, which is fine)
    lines_with_code = [
        line for line in source_no_comments.split("\n") if line.strip() and not line.strip().startswith("#")
    ]
    code_only = "\n".join(lines_with_code)

    # Check for the bug pattern
    if "self._page" in code_only:
        # Find the line for better error reporting
        for i, line in enumerate(source.split("\n"), 1):
            if "self._page" in line and not line.strip().startswith("#"):
                pytest.fail(
                    f"Found 'self._page' in code at line {i}: {line.strip()}\n"
                    "This is a regression! SkyvernPage uses self.page, not self._page."
                )


# =============================================================================
# Tests for _ensure_element_ids_on_page
# =============================================================================


@pytest.mark.asyncio
async def test_ensure_element_ids_skips_when_ids_exist(mock_scraped_page, mock_ai):
    """
    When unique_id attributes already exist on the page, build_tree_from_body
    should NOT be called (fast path).
    """
    mock_page = create_mock_page()
    # SkyvernPage.__getattribute__ delegates self.page to mock_page.page
    mock_page.page.evaluate = AsyncMock(return_value=True)  # unique_ids exist

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        with patch(
            "skyvern.core.script_generations.script_skyvern_page.SkyvernFrame.create_instance",
            new_callable=AsyncMock,
        ) as mock_create_instance:
            await script_page._ensure_element_ids_on_page()

            # Should NOT inject domUtils.js since IDs already exist
            mock_create_instance.assert_not_called()


@pytest.mark.asyncio
async def test_ensure_element_ids_injects_when_ids_missing(mock_scraped_page, mock_ai):
    """
    When no unique_id attributes exist (after page navigation), should inject
    domUtils.js and call buildTreeFromBody to set them.
    """
    mock_page = create_mock_page()
    # SkyvernPage.__getattribute__ delegates self.page to mock_page.page,
    # so set evaluate on the delegated object
    mock_page.page.evaluate = AsyncMock(return_value=False)  # no unique_ids

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        mock_skyvern_frame = MagicMock()
        mock_skyvern_frame.build_tree_from_body = AsyncMock(return_value=([], []))

        with patch(
            "skyvern.core.script_generations.script_skyvern_page.SkyvernFrame.create_instance",
            new_callable=AsyncMock,
            return_value=mock_skyvern_frame,
        ) as mock_create_instance:
            await script_page._ensure_element_ids_on_page()

            # Should inject domUtils.js
            mock_create_instance.assert_called_once()

            # Should build element tree
            mock_skyvern_frame.build_tree_from_body.assert_called_once_with(
                frame_name="main.frame",
                frame_index=0,
                timeout_ms=15000,
            )


@pytest.mark.asyncio
async def test_ensure_element_ids_handles_no_page(mock_scraped_page, mock_ai):
    """
    When self.page is None, should return early without error.
    """
    mock_page = create_mock_page()

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )
        script_page.page = None

        with patch(
            "skyvern.core.script_generations.script_skyvern_page.SkyvernFrame.create_instance",
            new_callable=AsyncMock,
        ) as mock_create_instance:
            await script_page._ensure_element_ids_on_page()
            mock_create_instance.assert_not_called()


@pytest.mark.asyncio
async def test_ensure_element_ids_catches_exceptions(mock_scraped_page, mock_ai):
    """
    Exceptions in _ensure_element_ids_on_page should be caught and not block
    action execution.
    """
    mock_page = create_mock_page()
    # SkyvernPage.__getattribute__ delegates self.page to mock_page.page
    mock_page.page.evaluate = AsyncMock(side_effect=Exception("Page crashed"))

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        # Should NOT raise
        await script_page._ensure_element_ids_on_page()


# =============================================================================
# Tests for terminate()
# =============================================================================


@pytest.mark.asyncio
async def test_terminate_raises_script_termination_exception_without_context(mock_scraped_page, mock_ai):
    """
    When there is no SkyvernContext, terminate() should raise ScriptTerminationException
    with the error messages from the errors list.
    """
    mock_page = create_mock_page()

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        with patch(
            "skyvern.core.script_generations.script_skyvern_page.skyvern_context.current",
            return_value=None,
        ):
            with pytest.raises(ScriptTerminationException, match="Terminate called: page not found"):
                await script_page.terminate(errors=["page not found"])


@pytest.mark.asyncio
async def test_terminate_calls_handler_and_raises(mock_scraped_page, mock_ai):
    """
    When context, task, and step are available, terminate() should call
    handle_terminate_action and then raise ScriptTerminationException.
    """
    mock_page = create_mock_page()

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        mock_context = MagicMock()
        mock_context.organization_id = "org_123"
        mock_context.workflow_run_id = "wr_456"
        mock_context.task_id = "tsk_789"
        mock_context.step_id = "stp_012"
        mock_context.action_order = 0

        mock_task = MagicMock()
        mock_step = MagicMock()
        mock_step.order = 0

        with (
            patch(
                "skyvern.core.script_generations.script_skyvern_page.skyvern_context.current",
                return_value=mock_context,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.app.DATABASE.get_task",
                new_callable=AsyncMock,
                return_value=mock_task,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.app.DATABASE.get_step",
                new_callable=AsyncMock,
                return_value=mock_step,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.handle_terminate_action",
                new_callable=AsyncMock,
                return_value=[MagicMock(success=True)],
            ) as mock_handler,
        ):
            with pytest.raises(ScriptTerminationException, match="Terminate called: error1; error2"):
                await script_page.terminate(errors=["error1", "error2"])

            # Verify handler was called with correct arguments
            mock_handler.assert_called_once()
            call_args = mock_handler.call_args
            action = call_args[0][0]
            assert action.organization_id == "org_123"
            assert action.workflow_run_id == "wr_456"
            assert action.task_id == "tsk_789"
            assert action.step_id == "stp_012"
            # Verify reasoning is set from errors for LLM extraction context
            assert action.reasoning == "error1; error2"


@pytest.mark.asyncio
async def test_terminate_raises_even_when_task_not_found(mock_scraped_page, mock_ai):
    """
    When context exists but task/step are not found in the database,
    terminate() should still raise ScriptTerminationException.
    """
    mock_page = create_mock_page()

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        mock_context = MagicMock()
        mock_context.organization_id = "org_123"
        mock_context.workflow_run_id = "wr_456"
        mock_context.task_id = "tsk_789"
        mock_context.step_id = "stp_012"

        with (
            patch(
                "skyvern.core.script_generations.script_skyvern_page.skyvern_context.current",
                return_value=mock_context,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.app.DATABASE.get_task",
                new_callable=AsyncMock,
                return_value=None,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.app.DATABASE.get_step",
                new_callable=AsyncMock,
                return_value=None,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.handle_terminate_action",
                new_callable=AsyncMock,
            ) as mock_handler,
        ):
            with pytest.raises(ScriptTerminationException, match="Terminate called: task failed"):
                await script_page.terminate(errors=["task failed"])

            # Handler should NOT be called when task/step not found
            mock_handler.assert_not_called()


@pytest.mark.asyncio
async def test_terminate_raises_even_when_handler_fails(mock_scraped_page, mock_ai):
    """
    When handle_terminate_action raises an exception (e.g., LLM call fails during
    extract_user_defined_errors), terminate() should still raise ScriptTerminationException
    so upstream workflow/service.py correctly marks the block as terminated.
    """
    mock_page = create_mock_page()

    with patch(
        "skyvern.core.script_generations.skyvern_page.Page.__init__",
        return_value=None,
    ):
        script_page = ScriptSkyvernPage(
            scraped_page=mock_scraped_page,
            page=mock_page,
            ai=mock_ai,
        )

        mock_context = MagicMock()
        mock_context.organization_id = "org_123"
        mock_context.workflow_run_id = "wr_456"
        mock_context.task_id = "tsk_789"
        mock_context.step_id = "stp_012"
        mock_context.action_order = 0

        mock_task = MagicMock()
        mock_step = MagicMock()
        mock_step.order = 0

        with (
            patch(
                "skyvern.core.script_generations.script_skyvern_page.skyvern_context.current",
                return_value=mock_context,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.app.DATABASE.get_task",
                new_callable=AsyncMock,
                return_value=mock_task,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.app.DATABASE.get_step",
                new_callable=AsyncMock,
                return_value=mock_step,
            ),
            patch(
                "skyvern.core.script_generations.script_skyvern_page.handle_terminate_action",
                new_callable=AsyncMock,
                side_effect=Exception("LLM call failed"),
            ) as mock_handler,
        ):
            # Should raise ScriptTerminationException, NOT the handler's Exception
            with pytest.raises(ScriptTerminationException, match="Terminate called: handler error"):
                await script_page.terminate(errors=["handler error"])

            mock_handler.assert_called_once()