""" Sensospot Images

Creating nice spot images from scans
"""

__version__ = "0.0.1"

from pathlib import Path
import sys

from sensospot_data import parse_file
from sensospot_data.parameters import _search_measurement_params_file

from .images import recalculate, get_position, annotate_image, load_array_image, crop
from .parameters import get_spot_parameters, get_array_parameters




def calulate_pixel_size(data_frame, array_definition):
    first = get_position(data_frame.iloc[0], actual=False)
    last = get_position(data_frame.iloc[-1], actual=False)

    x_dist_pixel = last.x - first.x
    y_dist_pixel = last.y - first.y

    ad = array_definition
    x_dist_um = ad.dist_x * (ad.size_x - 1)
    y_dist_um = ad.dist_y * (ad.size_y - 1)

    if x_dist_um == 0:
        # only one spot in x direction
        return x_dist_um / x_dist_pixel
    elif y_dist_um == 0:
        # only one spot in x direction
        return y_dist_um / y_dist_pixel

    # more than one spot in each direction
    x_pixel_size = x_dist_um / x_dist_pixel
    y_pixel_size = y_dist_um / y_dist_pixel

    return (x_pixel_size + y_pixel_size) / 2


def get_example_data_path(input_dir):
    input_path = Path(input_dir)
    tif_files = input_path.glob("*.tif")
    example_tif = next(tif_files)
    return example_tif.with_suffix(".csv")
    

def get_filename_prefix(input_dir):
    file_path = get_example_data_path(input_dir)
    example_name = file_path.stem
    prefix, well, exposure = example_name.rsplit("_", 2)
    return prefix


def retrieve_spot_parameters(input_dir, scale):
    parameters_path = _search_measurement_params_file(input_dir)
    if parameters_path is None:
        sys.exit(f"Could not find parameter files in {input_dir}")
    
    array_parameters = get_array_parameters(parameters_path)
    spot_parameters = get_spot_parameters(parameters_path, array_parameters)
    
    example_data_path = get_example_data_path(input_dir)
    example_data = parse_file(example_data_path)

    pixel_size = calulate_pixel_size(example_data, array_parameters)
    
    return recalculate(spot_parameters, scale / pixel_size)

def search_image_files(input_dir, wells, exposures):
    input_path = Path(input_dir)
    prefix = get_filename_prefix(input_path)
    tmp_pattern = f"{prefix}_*{wells}*_*{exposures}.tif"
    pattern = tmp_pattern.replace("***", "*").replace("**", "*")
    return input_path.glob(pattern)

def create_file_map(input_dir, wells, exposures):
    file_map = {}
    for tif_path in search_image_files(input_dir, wells, exposures):
        rest, exposure = tif_path.stem.rsplit("_", 1)
        csv_path = tif_path.parent / f"{rest}_1.csv"
        if csv_path.is_file():
            if csv_path not in file_map:
                file_map[csv_path] = []
            file_map[csv_path].append(tif_path)
    return file_map

def process_image(image_file, spot_parameters, spot_data, scale):
    img = load_array_image(image_file, scale=scale)
    annotate_image(img, spot_parameters, spot_data, scale)
    return img

def create_crops(output_path, img, image_path, spot_parameters, array_data, scale):
    base_name = image_path.stem
    for index, spot_data in array_data.iterrows():
        cropped_img = crop(img, spot_parameters, spot_data, scale)
        new_path = output_path / f"{base_name}_{index + 1:03}.tif"
        cropped_img.save(new_path)

def process(input_dir, output_dir, scale=3, wells="*", exposures="*", add_single_spots=False):
    spot_parameters = retrieve_spot_parameters(input_dir, scale)
    file_map = create_file_map(input_dir, wells, exposures)
    output_path = Path(output_dir)
    if not output_path.is_dir():
        sys.exit(f"Could not find output directory: {output_dir}")
    for data_file, image_files in file_map.items():
        array_data = parse_file(data_file)
        print(data_file)
        for image_path in image_files:
            img = process_image(image_path, spot_parameters, array_data, scale)
            img.save(output_path / image_path.name)
            if add_single_spots:
                create_crops(output_path, img, image_path, spot_parameters, array_data, scale)