# Copyright 2026 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import base64
from unittest.mock import AsyncMock, MagicMock, patch

from artemis.constants import VALIDATOR_MESSAGES_KEY
from artemis.context import ArtemisContext
from artemis.drivers.base import BaseDeviceDriver
from artemis.graph.state import State
from artemis.tools.base import ArtemisTool, ToolRegistry
from artemis.tools.mobile.ocr import (
    OCRRecognition,
    OcrArgs,
    OcrRecognition,
    OcrRecognitionTool,
    OcrTool,
    get_ocr_tool,
    ocr_recognition,
    ocr_recognition_wrapper,
)
from langgraph.types import Command
import pytest


@pytest.fixture
def mock_ctx():
    ctx = MagicMock(spec=ArtemisContext)
    ctx.device = MagicMock()
    ctx.device.device_width = 1080
    ctx.device.device_height = 2400
    return ctx


@pytest.fixture
def mock_driver():
    driver = MagicMock(spec=BaseDeviceDriver)
    driver.screen_size = (1080, 2400)
    screen_data = MagicMock()
    screen_data.screenshot_base64 = base64.b64encode(b"dummy_image_data").decode("utf-8")
    screen_data.screenshot_bytes = b"dummy_image_data"
    driver.get_screen_data = AsyncMock(return_value=screen_data)
    return driver


@pytest.fixture
def mock_state(tmp_path):
    screenshot_file = tmp_path / "test_screenshot.png"
    screenshot_file.write_bytes(b"dummy_image_content")

    state = MagicMock(spec=State)
    state.latest_screenshot = str(screenshot_file)

    async def _mock_asanitize_update(ctx, update, agent):
        return update

    state.asanitize_update = AsyncMock(side_effect=_mock_asanitize_update)
    return state


def test_ocr_tool_subclass_and_registry():
    """Verify OcrRecognitionTool is a subclass of ArtemisTool and properly registered."""
    assert issubclass(OcrRecognitionTool, ArtemisTool)
    assert issubclass(OcrRecognition, ArtemisTool)
    assert issubclass(OCRRecognition, ArtemisTool)
    assert issubclass(OcrTool, ArtemisTool)
    assert isinstance(ocr_recognition, ArtemisTool)
    assert isinstance(ocr_recognition, OcrRecognitionTool)

    assert ocr_recognition.name == "ocr_recognition"
    assert ocr_recognition.category == "explorer"
    assert ocr_recognition.args_schema == OcrArgs

    # Registry lookup
    reg_tool = ToolRegistry.get("ocr_recognition")
    assert reg_tool is not None
    assert isinstance(reg_tool, OcrRecognitionTool)

    # GenAI FunctionDeclaration export
    declaration = ocr_recognition.to_genai_declaration()
    assert declaration.name == "ocr_recognition"

    # Wrapper check
    assert ocr_recognition_wrapper is not None
    assert ocr_recognition_wrapper.tool_fn_getter == get_ocr_tool


class SimpleState:
    def __init__(self, screenshot_path: str):
        self.latest_screenshot = screenshot_path


@pytest.mark.asyncio
async def test_ocr_direct_execution_with_state(mock_ctx, tmp_path):
    """Verify direct execution with state and screenshot file."""
    screenshot_file = tmp_path / "test_screenshot.png"
    screenshot_file.write_bytes(b"dummy_image_content")
    simple_state = SimpleState(str(screenshot_file))

    mock_results = [
        {
            "text": "Submit",
            "position": [
                {"x": 100, "y": 200},
                {"x": 200, "y": 200},
                {"x": 200, "y": 300},
                {"x": 100, "y": 300},
            ],
        }
    ]
    with patch(
        "artemis.tools.mobile.ocr.perform_ocr",
        new_callable=AsyncMock,
        return_value=mock_results,
    ):
        result = await ocr_recognition.execute(ctx=mock_ctx, state=simple_state)
        assert "OCR Recognition successful." in result
        assert "Submit" in result


@pytest.mark.asyncio
async def test_ocr_direct_execution_with_driver(mock_ctx, mock_driver):
    """Verify direct execution with driver."""
    mock_results = [
        {
            "text": "Settings",
            "position": [
                {"x": 500, "y": 500},
                {"x": 600, "y": 600},
            ],
        }
    ]
    with patch(
        "artemis.tools.mobile.ocr.perform_ocr",
        new_callable=AsyncMock,
        return_value=mock_results,
    ):
        result = await ocr_recognition.execute(ctx=mock_ctx, driver=mock_driver)
        assert "OCR Recognition successful." in result
        assert "Settings" in result


@pytest.mark.asyncio
async def test_ocr_no_text_detected(mock_ctx, tmp_path):
    """Verify outcome when no text is detected."""
    screenshot_file = tmp_path / "test_empty_screenshot.png"
    screenshot_file.write_bytes(b"dummy_empty_content")
    simple_state = SimpleState(str(screenshot_file))

    with patch(
        "artemis.tools.mobile.ocr.perform_ocr",
        new_callable=AsyncMock,
        return_value=[],
    ):
        result = await ocr_recognition.execute(ctx=mock_ctx, state=simple_state)
        assert "No text detected on the screen." in result


@pytest.mark.asyncio
async def test_ocr_with_state_command(mock_ctx, mock_state):
    """Verify OcrRecognitionTool returns Command when state is provided."""
    mock_results = [{"text": "Hello", "position": [{"x": 100, "y": 100}]}]
    with patch(
        "artemis.tools.mobile.ocr.perform_ocr",
        new_callable=AsyncMock,
        return_value=mock_results,
    ):
        cmd = await ocr_recognition.execute(
            ctx=mock_ctx,
            tool_call_id="call_ocr_1",
            state=mock_state,
        )
        assert isinstance(cmd, Command)
        assert VALIDATOR_MESSAGES_KEY in cmd.update
        messages = cmd.update[VALIDATOR_MESSAGES_KEY]
        assert len(messages) == 1
        assert messages[0].tool_call_id == "call_ocr_1"
        assert messages[0].status == "success"
        assert "Hello" in messages[0].content


@pytest.mark.asyncio
async def test_ocr_failure_missing_screenshot(mock_ctx):
    """Verify error handling when screenshot path is missing."""
    empty_state = MagicMock(spec=State)
    empty_state.latest_screenshot = None
    empty_state.asanitize_update = AsyncMock(side_effect=lambda ctx, update, agent: update)

    cmd = await ocr_recognition.execute(
        ctx=mock_ctx,
        tool_call_id="call_ocr_err",
        state=empty_state,
    )
    assert isinstance(cmd, Command)
    messages = cmd.update[VALIDATOR_MESSAGES_KEY]
    assert messages[0].status == "error"
    assert "OCR Recognition failed" in messages[0].content


@pytest.mark.asyncio
async def test_ocr_callable_execution(mock_ctx, mock_driver):
    """Verify invoking ocr_recognition directly as a callable."""
    with patch(
        "artemis.tools.mobile.ocr.perform_ocr",
        new_callable=AsyncMock,
        return_value=[{"text": "Callable", "position": []}],
    ):
        result = await ocr_recognition(ctx=mock_ctx, driver=mock_driver)
        assert "OCR Recognition successful." in result
        assert "Callable" in result


@pytest.mark.asyncio
async def test_get_ocr_tool_langchain_ainvoke(mock_ctx, mock_driver):
    """Verify get_ocr_tool exports a LangChain tool that works with ainvoke."""
    mock_ctx._active_driver = mock_driver
    ocr_tool = get_ocr_tool(mock_ctx)
    assert ocr_tool.name == "ocr_recognition"

    with patch(
        "artemis.tools.mobile.ocr.perform_ocr",
        new_callable=AsyncMock,
        return_value=[{"text": "LangChain", "position": []}],
    ):
        result = await ocr_tool.ainvoke({})
        assert "OCR Recognition successful." in result
        assert "LangChain" in result