#!/usr/bin/env python3
# -*- coding: utf-8 -*-
'''
Script to start tests and to manage their results
'''
from io import StringIO
import datetime
import os
import subprocess
import sys
import uuid

import utils
from utils import log


class Logger(object):
    def __init__(self, stream, log_buffer):
        self.stream = stream
        self.log_buffer = log_buffer

    def write(self, text):
        self.stream.write(text)
        self.stream.flush()
        self.log_buffer.write(text)
        self.log_buffer.flush()

    def flush(self):
        pass

log_buffer = StringIO()
sys.stdout = Logger(sys.stdout, log_buffer)
sys.stderr = sys.stdout


class Tester():
    USAGE = '''%s [-e] [-d] [-h]
    -e: send email with report.
    -d: debug mode (can be started with non root users).
    -h: show this message.''' % __file__

    def __init__(self, *args):
        log('\033[96m-------------------------------\033[0m')
        log('\033[96m- UbiCast applications tester -\033[0m')
        log('\033[96m-------------------------------\033[0m')
        args = list(args)
        # Check if help is required
        if '-h' in args:
            log('USAGE: ' + self.USAGE)
            sys.exit(0)
        # Check current dir
        root_dir = utils.get_dir(__file__)
        if root_dir != '':
            os.chdir(root_dir)
        self.root_dir = root_dir
        # Add to python path
        if root_dir not in sys.path:
            sys.path.append(root_dir)
        # Check that this script is run by root
        debug = '-d' in args
        if debug:
            args.remove('-d')
        whoami = subprocess.check_output(['whoami']).decode('utf-8')
        if whoami != 'root' and not debug:
            log('This script should be run as root user.')
            sys.exit(1)
        # Load conf
        conf = utils.load_conf()
        if not conf:
            log('No configuration loaded.')
            sys.exit(1)
        # Check for email value
        email = '-e' in args
        if email:
            args.remove('-e')
        exit_code = self.run_tests(email)
        sys.exit(exit_code)

    def get_file_description(self, path):
        with open(path, 'r') as fo:
            content = fo.read()
        description = ''
        if path.endswith('.py'):
            start = content.find('\'\'\'')
            if start > 0:
                start += 3
                end = content.find('\'\'\'', start)
                if end > 0:
                    description = content[start:end]
        else:
            for line in content.split('\n'):
                if line.startswith('#!'):
                    continue
                elif line.startswith('#'):
                    description += line[1:].strip() + '\n'
                else:
                    break
        return description.strip()

    def run_tests(self, email=False):
        path = os.path.join(self.root_dir, 'tests')
        if not os.path.isdir(path):
            log('The tests dir is missing ("%s").' % path)
            return 1
        os.chdir(path)
        names = os.listdir(path)
        names.sort()
        if not names:
            log('The tests dir is empty ("%s").' % path)
            return 1
        results = list()
        exit_code = 0
        # Run all tests
        for name in names:
            log('\033[1;95m-- Test "%s" --\033[0;0m' % name)
            test_path = os.path.join(path, name)
            # Get test description
            description = self.get_file_description(test_path)
            # Run test
            try:
                code, out = utils.exec_cmd(test_path)
                if code != 0:
                    raise Exception('Command exited with code %s.' % code)
            except Exception as e:
                exit_code = 1
                log(e)
                results.append((False, test_path, description))
            else:
                results.append((True, test_path, description))
        log('\nTests results:')
        html_report = '<table border="1">'
        html_report += '\n<tr><th>Test</th><th>Result</th><th>Description</th></tr>'
        for success, test_path, description in results:
            file_name = os.path.basename(test_path)
            if success:
                html_result = '<span style="color: green;">success</span>'
                term_result = '\033[92msuccess\033[0m'
            else:
                html_result = '<span style="color: red;">failure</span>'
                term_result = '\033[91mfailure\033[0m'
            log('  %s: %s' % (file_name, term_result))
            html_report += '\n<tr><td>%s</td><td>%s</td><td>%s</td></tr>' % (file_name, html_result, description.replace('\n', '<br/>\n'))
        html_report += '\n</table>'
        # Send email
        if email:
            log('')
            hostname = subprocess.check_output(['hostname'])
            if not hostname:
                log('Failed to get hostname (required to send email).')
                return 1
            recipients = utils.get_conf('EMAIL_ADMINS')
            if not recipients:
                log('No recipients defined for email sending. Set a value for EMAIL_ADMINS.')
                return 1
            boundary = str(uuid.uuid4())
            now = datetime.datetime.utcnow()
            mail = '''From: %(hostname)s <noreply@ubicast.eu>
To: %(recipients)s
Subject: UbiCast application test: %(status)s
Mime-Version: 1.0
Content-type: multipart/related; boundary="%(boundary)s"

--%(boundary)s
Content-Type: text/html; charset=UTF-8
Content-transfer-encoding: utf-8

<b>Date: %(date)s UTC</b><br/><br/>
%(report)s

--%(boundary)s
Content-type: application/octet-stream; name="%(log_name)s"
Content-disposition: attachment; filename="%(log_name)s"
Content-transfer-encoding: utf-8

%(log_content)s
''' % dict(
                boundary=boundary,
                hostname=hostname.decode('utf-8'),
                recipients=recipients,
                status='OK' if exit_code == 0 else 'KO',
                date=now.strftime('%Y-%m-%d %H:%M:%S'),
                log_name='results_' + now.strftime('%Y-%m-%d_%H-%M-%S') + '.txt',
                report=html_report,
                log_content=log_buffer.getvalue(),
            )
            p = subprocess.Popen(['sendmail', '-t'], stdin=subprocess.PIPE, stdout=sys.stdout.stream, stderr=sys.stderr.stream)
            p.communicate(input=mail.encode('utf-8'))
            if p.returncode != 0:
                log('Failed to send email.')
                return 1
            else:
                log('Email sent to: %s' % recipients)
        return exit_code


if __name__ == '__main__':
    Tester(*sys.argv[1:])