# Standard Modules
import logging
from pathlib import Path
from PIL import Image

# Internal Packages
from khoj.utils.state import model
from khoj.utils.constants import web_directory
from khoj.search_type import image_search
from khoj.utils.helpers import resolve_absolute_path
from khoj.utils.rawconfig import ContentConfig, SearchConfig


# Test
# ----------------------------------------------------------------------------------------------------
def test_image_search_setup(content_config: ContentConfig, search_config: SearchConfig):
    # Act
    # Regenerate image search embeddings during image setup
    image_search_model = image_search.setup(content_config.image, search_config.image, regenerate=True)

    # Assert
    assert len(image_search_model.image_names) == 3
    assert len(image_search_model.image_embeddings) == 3


# ----------------------------------------------------------------------------------------------------
def test_image_metadata(content_config: ContentConfig):
    "Verify XMP Description and Subjects Extracted from Image"
    # Arrange
    expected_metadata_image_name_pairs = [
        (["Billi Ka Bacha.", "Cat", "Grass"], "kitten_park.jpg"),
        (["Pasture.", "Horse", "Dog"], "horse_dog.jpg"),
        (["Guinea Pig Eating Celery.", "Rodent", "Whiskers"], "guineapig_grass.jpg")]

    test_image_paths = [
        Path(content_config.image.input_directories[0] / image_name[1])
        for image_name in expected_metadata_image_name_pairs
    ]

    for expected_metadata, test_image_path in zip(expected_metadata_image_name_pairs, test_image_paths):
        # Act
        actual_metadata = image_search.extract_metadata(test_image_path)

        # Assert
        for expected_snippet in expected_metadata[0]:
            assert expected_snippet in actual_metadata


# ----------------------------------------------------------------------------------------------------
def test_image_search(content_config: ContentConfig, search_config: SearchConfig):
    # Arrange
    output_directory = resolve_absolute_path(web_directory)
    model.image_search = image_search.setup(content_config.image, search_config.image, regenerate=False)
    query_expected_image_pairs = [("kitten", "kitten_park.jpg"),
                                  ("horse and dog in a farm", "horse_dog.jpg"),
                                  ("A guinea pig eating grass", "guineapig_grass.jpg")]

    # Act
    for query, expected_image_name in query_expected_image_pairs:
        hits = image_search.query(
            query,
            count = 1,
            model = model.image_search)

        results = image_search.collate_results(
            hits,
            model.image_search.image_names,
            output_directory=output_directory,
            image_files_url='/static/images',
            count=1)

        actual_image_path = output_directory.joinpath(Path(results[0].entry).name)
        actual_image = Image.open(actual_image_path)
        expected_image = Image.open(content_config.image.input_directories[0].joinpath(expected_image_name))

        # Assert
        assert expected_image == actual_image

    # Cleanup
    # Delete the image files copied to results directory
    actual_image_path.unlink()


# ----------------------------------------------------------------------------------------------------
def test_image_search_query_truncated(content_config: ContentConfig, search_config: SearchConfig, caplog):
    # Arrange
    model.image_search = image_search.setup(content_config.image, search_config.image, regenerate=False)
    max_words_supported = 10
    query = " ".join(["hello"]*100)
    truncated_query = " ".join(["hello"]*max_words_supported)

    # Act
    try:
        with caplog.at_level(logging.INFO, logger="khoj.search_type.image_search"):
            image_search.query(
                query,
                count = 1,
                model = model.image_search)
    # Assert
    except RuntimeError as e:
        if "The size of tensor a (102) must match the size of tensor b (77)" in str(e):
            assert False, f"Query length exceeds max tokens supported by model\n"
    assert f"Find Images by Text: {truncated_query}" in caplog.text, "Query not truncated"


# ----------------------------------------------------------------------------------------------------
def test_image_search_by_filepath(content_config: ContentConfig, search_config: SearchConfig, caplog):
    # Arrange
    output_directory = resolve_absolute_path(web_directory)
    model.image_search = image_search.setup(content_config.image, search_config.image, regenerate=False)
    image_directory = content_config.image.input_directories[0]

    query = f"file:{image_directory.joinpath('kitten_park.jpg')}"
    expected_image_path = f"{image_directory.joinpath('kitten_park.jpg')}"

    # Act
    with caplog.at_level(logging.INFO, logger="khoj.search_type.image_search"):
        hits = image_search.query(
            query,
            count = 1,
            model = model.image_search)

        results = image_search.collate_results(
            hits,
            model.image_search.image_names,
            output_directory=output_directory,
            image_files_url='/static/images',
            count=1)

    actual_image_path = output_directory.joinpath(Path(results[0].entry).name)
    actual_image = Image.open(actual_image_path)
    expected_image = Image.open(expected_image_path)

    # Assert
    # Ensure file search triggered instead of query with file path as string
    assert f"Find Images by Image: {resolve_absolute_path(expected_image_path)}" in caplog.text, "File search not triggered"
    # Ensure the correct image is returned
    assert expected_image == actual_image, "Incorrect image returned by file search"

    # Cleanup
    # Delete the image files copied to results directory
    actual_image_path.unlink()