#!/usr/bin/env python3
"""
Handle API requests to the database
"""
import json
import sqlite3


DATABASE = '/usr/local/www/mocha-server/mocha.db'


def fetch(user_id):
    """
    Returns a JSON object containing the requested user
    Also can return a list of all users if user_id == "*"
    """
    conn = sqlite3.connect(DATABASE)
    conn.row_factory = sqlite3.Row
    cursor = conn.cursor()

    if user_id != '*':
        cursor.execute("SELECT * FROM users WHERE user_id=?", user_id)
    else:
        cursor.execute("SELECT * FROM users")

    output = cursor.fetchall()
    output = json.dumps([dict(row) for row in output])
    conn.close()

    if output is None:
        output = ('Error',)
    return output


def process_request(uri):
    """
    Handles the API endpoint.
    Currently supports:
        -   /mocha/users/"user_id"      Returns JSON of the specified user
        -   /mocha/users/*              Returns JSON list of all users
    """
    parts = uri.split('/')[1:]
    assert parts[0] == 'mocha'

    output = ''

    if parts[1] == 'users':
        output = fetch(parts[2])
        return output

    return None


def application(environ, start_response):
    """
    mod_wsgi entry point
    """
    status = '200 OK'
    output = process_request(environ['REQUEST_URI']).encode('UTF-8')

    response_headers = [('Content-type', 'application/json'),
                        ('Content-Length', str(len(output)))]
    start_response(status, response_headers)

    return [output]