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#!/usr/bin/env python3

# SPDX-License-Identifier: BSD-3-Clause
# Copyright (C) 2022, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

# A simple capture example showing:
# - How to setup the camera
# - Capture certain number of frames in a blocking manner
# - How to stop the camera
#
# This simple example is, in many ways, too simple. The purpose of the example
# is to introduce the concepts. A more realistic example is given in
# simple-continuous-capture.py.

import argparse
import libcamera as libcam
import selectors
import sys

# Number of frames to capture
TOTAL_FRAMES = 30


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-c', '--camera', type=str, default='1',
                        help='Camera index number (starting from 1) or part of the name')
    parser.add_argument('-f', '--format', type=str, help='Pixel format')
    parser.add_argument('-s', '--size', type=str, help='Size ("WxH")')
    args = parser.parse_args()

    cm = libcam.CameraManager.singleton()

    try:
        if args.camera.isnumeric():
            cam_idx = int(args.camera)
            cam = next((cam for i, cam in enumerate(cm.cameras) if i + 1 == cam_idx))
        else:
            cam = next((cam for cam in cm.cameras if args.camera in cam.id))
    except Exception:
        print(f'Failed to find camera "{args.camera}"')
        return -1

    # Acquire the camera for our use

    cam.acquire()

    # Configure the camera

    cam_config = cam.generate_configuration([libcam.StreamRole.Viewfinder])

    stream_config = cam_config.at(0)

    if args.format:
        fmt = libcam.PixelFormat(args.format)
        stream_config.pixel_format = fmt

    if args.size:
        w, h = [int(v) for v in args.size.split('x')]
        stream_config.size = libcam.Size(w, h)

    cam.configure(cam_config)

    print(f'Capturing {TOTAL_FRAMES} frames with {stream_config}')

    stream = stream_config.stream

    # Allocate the buffers for capture

    allocator = libcam.FrameBufferAllocator(cam)
    ret = allocator.allocate(stream)
    assert ret > 0

    num_bufs = len(allocator.buffers(stream))

    # Create the requests and assign a buffer for each request

    reqs = []
    for i in range(num_bufs):
        # Use the buffer index as the cookie
        req = cam.create_request(i)

        buffer = allocator.buffers(stream)[i]
        req.add_buffer(stream, buffer)