from time import time
from statistics import mean
from flask import Flask, jsonify, render_template, request

from modules.details import rand_details
from modules.inference import generate_image

app = Flask(__name__)


@app.route('/')
def index():
    return render_template('index.html', **rand_details())


tasks = {}


def place_in_queue(task_id):

    pending_tasks = list(task for task in tasks.values()
                         if task["status"] == "pending")

    try:
        return pending_tasks.index(task_id) + 1
    except:
        return 0


def calculate_eta(task_id):
    total_durations = list(task["completed_at"] - task["created_at"]
                           for task in tasks.values() if "completed_at" in task)

    place = tasks[task_id]["initial_place_in_queue"] or 1

    if len(total_durations):
        return sum(total_durations) / len(total_durations) * place
    else:
        return 40 * place


@app.route('/task/create')
def create_task():
    prompt = request.args.get('prompt') or "покемон"

    created_at = time()

    task_id = f"{str(created_at)}_{prompt}"

    tasks[task_id] = {
        "task_id": task_id,
        "created_at": created_at,
        "prompt": prompt,
        "initial_place_in_queue": place_in_queue(task_id),
        "status": "pending",
        "poll_count": 0,
    }

    print("Place in queue: ", place_in_queue(task_id))
    print("ETA: ", calculate_eta(task_id))

    return jsonify(tasks[task_id])


@app.route('/task/queue')
def queue_task():
    task_id = request.args.get('task_id')

    try:
        tasks[task_id]["value"] = generate_image(tasks[task_id]["prompt"])
    except Exception as ex:
        tasks[task_id]["status"] = "failed"
        tasks[task_id]["error"] = repr(ex)
    else:
        tasks[task_id]["status"] = "completed"
    finally:
        tasks[task_id]["completed_at"] = time()

    return jsonify(tasks[task_id])


@app.route('/task/poll')
def poll_task():
    task_id = request.args.get('task_id')

    pending_tasks = []
    completed_durations = []

    for task in tasks.values():
        if task["status"] == "pending":
            pending_tasks.append(task["task_id"])
        elif task["status"] == "completed":
            completed_durations.append(
                task["completed_at"] - task["created_at"])

    try:
        place_in_queue = pending_tasks.index(task_id) + 1
    except:
        place_in_queue = 0

    if (len(completed_durations)):
        eta = sum(completed_durations) / \
            len(completed_durations) * (place_in_queue or 1)
    else:
        eta = 40 * (place_in_queue or 1)

    tasks[task_id]["place_in_queue"] = place_in_queue
    tasks[task_id]["eta"] = round(eta, 1)
    tasks[task_id]["poll_count"] += 1

    return jsonify(tasks[task_id])


@app.route('/details')
def generate_details():
    return jsonify(rand_details())


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860)