#!/usr/bin/env python3


import os
import sys
import signal
import datetime
import threading
import subprocess
from flask import Flask, request, Response
from flask_restful import Resource, Api
from flask_jsonpify import jsonify


app = Flask(__name__, static_folder='.')
api = Api(app)


schedule = []
runners = []


class ScheduledTest:
    def __init__(self, template, path):
        self.template = template
        self.path = path
        self.state = 'SCHEDULED'
        self.added = datetime.datetime.now()
        self.lock = threading.Lock()

    def to_dict(self):
        return {
            'id': str(id(self)),
            'template': self.template,
            'state': self.state,
            'path': self.path,
            'added': self.added,
        }


class Runner(threading.Thread):
    def __init__(self, template, program=None):
        if program is None:
            program = ['python3', './templates/%s/test' % template]

        self.template = template
        self.program = program
        self.process = None
        self.job = None
        self.stop_event = threading.Event()

        threading.Thread.__init__(self)
        self.name += "-%s" % template
        self.start()

    def to_dict(self):
        return {
            'id': str(id(self)),
            'template': self.template,
            'program': ' '.join(self.program),
            'job': str(id(self.job)) if self.job is not None else None
        }

    def stop(self):
        self.stop_event.set()

    def run(self):
        while not self.stop_event.is_set():
            my_queue = [
                s for s in schedule
                if s.state == 'SCHEDULED'
                and s.template == self.template
            ]
            my_queue.sort(key=lambda s: s.added)
            if len(my_queue) == 0:
                # No tasks for this thread, go to sleep
                self.stop_event.wait(timeout=5)
                continue

            job = my_queue[0]

            with job.lock:
                # Check if we were the first thread to choose this job
                if job.state == 'SCHEDULED':
                    job.state = 'RUNNING'
                    self.job = job
                else:
                    # Some other thread is running this test
                    continue

            cmd = []
            cmd += self.program
            cmd += [self.job.path]
            print("Executing ``%s´´" % ' '.join(cmd))
            out_path = os.path.join(self.job.path, 'test.stdout.log')
            err_path = os.path.join(self.job.path, 'test.stderr.log')
            with open(out_path, 'w') as out_fd, \
                    open(err_path, 'w') as err_fd:
                self.process = subprocess.Popen(
                    cmd,
                    stdout=out_fd,
                    stderr=err_fd
                )
                while self.process.poll() is None:
                    if self.stop_event.wait(timeout=1):
                        self.process.send_signal(signal.SIGINT)
                        try:
                            self.process.wait(timeout=1)
                        except subprocess.TimeoutExpired:
                            pass

            if self.process.returncode == 0:
                self.job.state = 'SUCCESSFUL'
            else:
                self.job.state = 'FAILED'
            self.process = None

            subprocess.check_call(
                ['zip', '-r', 'results.zip', '.'],
                cwd=self.job.path)

            print("Job %d has finished" % id(self.job))
            self.job = None
        print("Thread %s has finished" % self.name)


class Status(Resource):
    def get(self):
        print(request.data)
        return jsonify({
            'schedule': [t.to_dict() for t in schedule],
            'runners': [r.to_dict() for r in runners]
        })


class RestartJob(Resource):
    def get(self, job_id):
        job = [job for job in schedule if str(id(job)) == job_id]
        job = job[0] if len(job) > 0 else None
        if job is None:
            return 'Job not found', 404

        with job.lock:
            if job.state != 'RUNNING':
                job.state = 'SCHEDULED'
                return jsonify({'success': True})
            else:
                return 'Job is already running', 400


class ScheduleJob(Resource):
    def post(self):
        if not request.is_json:
            return 'Please send me JSON', 400
        data = request.get_json()
        print(data)
        if 'path' not in data:
            return 'path expected', 400
        if 'template' not in data:
            return 'template expected', 400

        schedule.append(ScheduledTest(data['template'], data['path']))

        result = {'success': True}
        return jsonify(result)


api.add_resource(Status, '/status')
api.add_resource(ScheduleJob, '/schedule_test')
api.add_resource(RestartJob, '/restart_test/<string:job_id>')


@app.route('/')
def root():
    return app.send_static_file('index.html')


@app.route('/view_log/<string:job_id>/<int:log_id>')
def view_log(job_id, log_id):
    job = [job for job in schedule if str(id(job)) == job_id]
    job = job[0] if len(job) > 0 else None
    if job is None:
        return 'Job not found', 404

    log_name = [
        'make.stdout.log', 'make.stderr.log',
        'test.stdout.log', 'test.stderr.log',
    ][log_id]
    log_path = os.path.join(job.path, log_name)
    if not os.path.isfile(log_path):
        return 'Log not found', 404
    with open(log_path, 'r') as f:
        return Response(f.read(), mimetype='text/plain')


@app.route('/results/<string:job_id>/results.zip')
def get_results_zip(job_id):
    job = next(filter(lambda job: str(id(job)) == job_id, schedule), None)
    if job is None:
        return 'Job not found', 404
    zip_path = os.path.join(job.path, 'results.zip')
    with open(zip_path, 'rb') as zip:
        return Response(zip.read(), mimetype='application/zip')


if __name__ == '__main__':
    runners.append(Runner('maixduino'))
    runners.append(Runner('f7'))
    runners.append(Runner('uno'))
    runners.append(Runner('esp32'))
    runners.append(Runner('bluepill'))

    def signal_handler(signal, frame):
        print("Process interrupted!", file=sys.stderr)
        for r in runners:
            print("Stopping runner %s" % r.name, file=sys.stderr)
            r.stop()
            r.join()
            print("Runner %s stopped" % r.name, file=sys.stderr)
        sys.exit(0)
    signal.signal(signal.SIGINT, signal_handler)

    app.run(port='5002')