#!/usr/bin/env python

# python-gphoto2 - Python interface to libgphoto2
# http://github.com/jim-easterbrook/python-gphoto2
# Copyright (C) 2015-22  Jim Easterbrook  jim@jim-easterbrook.me.uk
#
# This file is part of python-gphoto2.
#
# python-gphoto2 is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# python-gphoto2 is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with python-gphoto2.  If not, see
# <https://www.gnu.org/licenses/>.

import logging
import locale
import os
# ~ import subprocess
import sys

import gphoto2 as gp

camera_current_settings = {
    'capturemode' : dict(min=0, max=4, default=0, value=3),     # 0: single,1: burst,2:Timer,3:2S Remote,4:Quick remote
    'imagesize' : dict(min=0, max=2, default=0, value=2),       # 0:L, 1:M, 2: S (1936x1296)
    'whitebalance' : dict(min=0, max=7, default=0, value=1),    # 0 Automatic 1 Daylight 2 Fluorescent 3 Tungsten 4 Flash 5 Cloudy 6 Shade 7 Preset
    'capturetarget' : dict(min=0, max=1, default=0, value=0),   # Internal memory
    # ~ 'nocfcardrelease' : dict(min=0, max=1, default=0, value=0), # Allow capture without sd card
    # ~ 'recordingmedia'  : dict(min=0, max=1, default=0, value=1), # Write to RAM
}

def initialize_camera():
    camera = gp.check_result(gp.gp_camera_new())
    try:
        gp.check_result(gp.gp_camera_init(camera))
        # get configuration tree
        current_camera_config = gp.check_result(gp.gp_camera_get_config(camera))
    except:
        camera.exit()
        camera = None
        current_camera_config = None
    return camera, current_camera_config


# TODO: find how to use gp.CameraWidget.get_range() and check parameter value is in range before applying.

def apply_gphoto_setting(config, setting, new_value, inc=False):
    # find the $setting config item
    try:
        # Get widget with name $setting
        cur_setting = gp.check_result(gp.gp_widget_get_child_by_name(config, setting))
        # Get a list of available choices
        choices = list(gp.check_result(gp.gp_widget_get_choices(cur_setting)))
        # Build dict with name/value equivalence
        choices_dict = {choices.index(i):i for i in list(choices)}
        # Increment mode : current value is increased or looped
        if inc:
            # Get current setting value
            new_value = gp.check_result(gp.gp_widget_get_value(cur_setting))
            # Check current value + 1 is in range
            if new_value in range(0, len(choices)):
            # Apply or loop value accordingly
                pass
        # If new_value exists in list, apply
        if new_value['value'] in choices_dict:
            cur_setting_choice = gp.check_result(gp.gp_widget_get_choice(cur_setting, new_value['value']))
            # set config value
            gp.check_result(gp.gp_widget_set_value(cur_setting, cur_setting_choice))
    except:
        print("Configuration error while setting {} to {}".format(setting, new_value))


def apply_dslr_settings(camera_settings):
    camera, config = initialize_camera()
    # iterate over the settings dictionary
    for setting in camera_settings:
        apply_gphoto_setting(config, setting, camera_settings[setting])
    # validate config
    status = gp.check_result(gp.gp_camera_set_config(camera, config))
    # close camera
    camera.exit()
    return status


def check_status_value(config, value, optimal_value=None):
    cur_check = gp.check_result(gp.gp_widget_get_child_by_name(config, value))
    cur_check_value = gp.check_result(gp.gp_widget_get_value(cur_check))
    if optimal_value is not None:
        cur_check_choice = gp.check_result(gp.gp_widget_get_choice(cur_check, optimal_value[value]))
        return [cur_check_value, cur_check_choice]
    else:
        return cur_check_value


# ~ def check_status(camera, config):
    # ~ for value in camera_status:
        # ~ cur_check_value, cur_check_choice = check_status_value(config, value, camera_status)
        # ~ if cur_check_value == cur_check_choice:
            # ~ return True
        # ~ else:
            # ~ # Some values are not optimal
            # ~ return False


def find_file_ext(gp_name:str, full_path:str):
    # extract dir path
    dirname = os.path.dirname(full_path)
    # extract filename from path
    new_name = os.path.basename(full_path)
    # if the path does'nt contain file name, return camera's FS filename
    if not full_path.endswith(('.jpg', '.JPG', '.raw')):
        return gp_name
    suffix = gp_name.split('.')[-1]
    prefix = new_name.split('.')[:-1]
    prefix.insert(len(prefix), suffix)
    print(suffix)
    print(prefix)
    return os.path.join(dirname, '.'.join(prefix))


def capture_and_download(target:str='/tmp'):
    camera, current_camera_config = initialize_camera()
    # Check battery level
    battery_level = int(check_status_value(current_camera_config, 'batterylevel')[:-1])
    if battery_level < 10:
        print("Battery level is too low, shutter disabled.")
        return False
    file_path = camera.capture(gp.GP_CAPTURE_IMAGE)
    print('Camera file path: {0}/{1}'.format(file_path.folder, file_path.name))
    print(target)
    target = find_file_ext(file_path.name, target)
    print('Copying image to', target)
    try:
        camera_file = camera.file_get(
        file_path.folder, file_path.name, gp.GP_FILE_TYPE_NORMAL)
    except:
        print("Camera error. Check Battery and try restarting the camera.")
        return False
    try:
        camera_file.save(target)
    except:
        print('File access error.')
        return False
    camera.exit()
    return True

def main():
    apply_dslr_settings(camera_current_settings)

if __name__ == "__main__":
    logging.basicConfig(
        format='%(levelname)s: %(name)s: %(message)s', level=logging.ERROR)
    callback_obj = gp.check_result(gp.use_python_logging())
    sys.exit(main())