import io  # Used in our capture action
import time  # Used in our timelapse function

from flask import send_file  # Used to send images from our server
from labthings import (
    Schema,
    current_action,
    fields,
    find_component,
    update_action_progress,
)
from labthings.extensions import BaseExtension
from labthings.views import ActionView, PropertyView, View

# Used in our timelapse function
from openflexure_microscope.captures.capture_manager import generate_basename

## Extension methods


def timelapse(microscope, n_images, t_between):
    """
    Save a set of images in a timelapse

    Args:
        microscope: Microscope object
        n_images (int): Number of images to take
        t_between (int/float): Time, in seconds, between sequential captures
    """
    base_file_name = generate_basename()
    folder = "TIMELAPSE_{}".format(base_file_name)

    # Take exclusive control over both the camera and stage
    with microscope.camera.lock, microscope.stage.lock:
        for n in range(n_images):
            # Elegantly handle action cancellation
            if current_action() and current_action().stopped:
                return
            # Generate a filename
            filename = f"{base_file_name}_image{n}"
            # Create a file to save the image to
            output = microscope.camera.new_image(
                filename=filename, folder=folder, temporary=False
            )

            # Capture
            microscope.camera.capture(output)

            # Add system metadata
            output.put_metadata(microscope.metadata, system=True)

            # Update task progress (only does anyting if the function is running in a LabThings task)
            progress_pct = ((n + 1) / n_images) * 100  # Progress, in percent
            update_action_progress(progress_pct)

            # Wait for the specified time
            time.sleep(t_between)


## Extension views


class TimelapseAPI(ActionView):
    """
    Take a series of images in a timelapse
    """

    args = {
        "n_images": fields.Integer(
            required=True, example=5, description="Number of images"
        ),
        "t_between": fields.Number(
            missing=1, example=1, description="Time (seconds) between images"
        ),
    }

    def post(self, args):
        # Find our microscope component
        microscope = find_component("org.openflexure.microscope")

        # Start "timelapse"
        return timelapse(microscope, args.get("n_images"), args.get("t_between"))


## Create extension

# Create your extension object
my_extension = BaseExtension("com.myname.timelapse-extension", version="0.0.0")

# Add methods to your extension
my_extension.add_method(timelapse, "timelapse")

# Add API views to your extension
my_extension.add_view(TimelapseAPI, "/timelapse")