from router import route
from utils import render_template, NOT_FOUND_CODE
from config import SERVER_HOST, SERVER_PORT, STATIC_FILES_PATH

import logging
import csv
from sys import stdout


@route('/static/(.*?)/(.*?)/?')
def return_static(query, *args):
    if args[0] in ['css', 'js']:
        try:
            with open(STATIC_FILES_PATH + f'/{args[0]}/{args[1]}', encoding='utf-8') as f:
                data = f.read()

            return args[0], {'js': 'javascript', 'css': 'css'}[args[0]], data

        except (PermissionError, FileNotFoundError):
            return ''
    elif args[0] == 'images':
        try:
            with open(STATIC_FILES_PATH + f'/{args[0]}/{args[1]}', 'rb') as f:
                data = f.read()

            return 'image', args[1].split('.')[-1], data
        except (PermissionError, FileNotFoundError):
            return ''


@route('/api/upload', ['POST'])
def upload_file(query, *args):
    try:
        data = query['files'][0]['data'].decode()
    except (UnicodeDecodeError, KeyError, IndexError):
        return '<a href="/">Return to main page</a><br><h1>Error while reading file</h1>'

    permitted_headers = db_column_names()

    try:
        data = list(csv.reader(data.strip().splitlines(), delimiter=';', quotechar='"'))
        if len(data[0]) != len(permitted_headers) or set(data[0]) != set(permitted_headers):
            return '<a href="/">Return to main page</a><br><h1>File format error</h1>'
    except IndexError:
        return '<a href="/">Return to main page</a><br><h1>File format error</h1>'

    cursor = db.cursor()
    cursor.execute("START TRANSACTION; DELETE FROM `table_task1`; COMMIT;")
    cursor.close()

    for row in data[1:]:
        values = []
        for i in range(len(row)):
            if row[i] == 'NULL':
                if data[0][i] == 'creation_request_sent_date':
                    value = 'NULL'
                else:
                    value = '"NULL"'
            else:
                value = f'"{row[i]}"'

            values.append(value)

        cursor = db.cursor()
        cursor.execute(
            "START TRANSACTION; "
            "INSERT INTO `table_task1` ({}) VALUES ({}); "
            "COMMIT;".format(
                ','.join(data[0]), ','.join(values)
            )
        )
        cursor.close()

    return '<a href="/">Return to main page</a><br><h1>File uploaded</h1>'


@route('/api/update', ['POST'])
def update_post(query, *args):
    service_id = query['service_id']
    permitted_fields = db_column_names()
    permitted_fields.remove('service_id')

    query_set = []
    for field_name, value in query.items():
        if field_name in permitted_fields:
            query_set.append(f'{field_name}="{value}"')

    cursor = db.cursor()
    cursor.execute("START TRANSACTION; UPDATE `table_task1` SET {} WHERE {}; COMMIT;".format(
        ','.join(query_set), f'service_id="{service_id}"'
    ))
    cursor.close()

    return f'<a href="/">Return to main page</a><br><h1>Database Updated {query}</h1>'


@route('/api/delete', ['POST'])
def delete_post(query, *args):
    service_id = query['service_id']
    cursor = db.cursor()
    cursor.execute(f'START TRANSACTION; DELETE FROM `table_task1` WHERE service_id="{service_id}"; COMMIT;')

    return f'<a href="/">Return to main page</a><br><h1>Database Updated {query}</h1>'


@route('/api/add', ['POST'])
def add_post(query, *args):
    header_fields = db_column_names()
    headers = []
    values = []
    for field_name in query:
        if field_name in header_fields:
            headers.append(field_name)
            values.append(f'"{query[field_name]}"')

    if len(headers) == len(header_fields):
        cursor = db.cursor()
        cursor.execute("START TRANSACTION; INSERT INTO `table_task1` ({}) VALUES ({}); COMMIT;".format(
            ','.join(headers), ','.join(values)
        ))
        cursor.close()

    return f'<a href="/">Return to main page</a><br><h1>Database Updated {query}</h1>'


@route('/get', ['POST'])
def db_get(query, *args):
    table_headers = db_column_names()
    cursor = db.cursor()

    if query['type'] == 'full':
        cursor.execute('SELECT * FROM table_task1;')
        content = cursor.fetchall()

        cursor.close()

        json_content = []
        for row in content:
            new_row = []
            for col in row:
                if not isinstance(col, (float, bool, int, dict, list, tuple)):
                    col = str(col)
                new_row.append(col)
            json_content.append(new_row)

        return {'headers': table_headers, 'content': json_content}

    elif query['type'] == 'single_id':
        cursor.execute(f'SELECT * FROM table_task1 WHERE service_id="{query["service_id"]}";')
        content = cursor.fetchone()

        cursor.close()

        json_content = []
        for col in content:
            if not isinstance(col, (float, bool, int, dict, list, tuple)):
                col = str(col)
            json_content.append(col)

        return dict(zip(table_headers, json_content))

    return NOT_FOUND_CODE


@route('/')
def index_get(query, *args):
    data = render_template('index.html')
    return data


def prepare_logger():
    logger = logging.getLogger('tableApp')
    logger.setLevel(logging.INFO)

    sh = logging.StreamHandler(stdout)
    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    sh.setFormatter(formatter)
    logger.addHandler(sh)


if __name__ == '__main__':
    prepare_logger()

    from server import start_server
    from database import db, db_column_names

    logging.getLogger('tableApp').info(f'Starting server...')
    start_server(SERVER_HOST, SERVER_PORT)