import json
import sqlalchemy
from sqlalchemy.sql import select
from sqlalchemy.sql import text
from flask import Flask
from flask import render_template

app = Flask(__name__)

db_engine = {}
db_metadata = {}
parts = {}

@app.route('/')
def index():
    return render_template('partsearch.html')

@app.route('/getpartinfo/<partID>')
def get_part_info(partID):
    s = 'select * from parts where id = :id;'
    r = db_engine.execute(text(s), id=partID)
    l = []
    for row in r:
        l.append(dict(row))
    r.close()
    return json.dumps(l[0])

@app.route('/query/<filter>/<query>')
def query(filter, query):
    query = '%' + query + '%'
    s = 'select * from parts where '
    if filter & (1 << 0) != 0:
        s += 'LOWER(type) like LOWER(:name) or '
    if filter & (1 << 1) != 0:
        s += 'LOWER(partno) like LOWER(:name) or '
    if filter & (1 << 2) != 0:
        s += 'LOWER(partnoalt) like LOWER(:name) or '
    if filter & (1 << 3) != 0:
        s += 'LOWER(partnoalt2) like LOWER(:name) or '
    if filter & (1 << 4) != 0:
        s += 'LOWER(description) like LOWER(:name) or '
    s = s[:-4] + ';'
    s = text(s)
    r = db_engine.execute(s, name=query)
    l = []
    for row in r:
        l.append(dict(row))
    r.close()
    return json.dumps(l)

def connect(user, password, db, host='localhost', port=5432):
    '''Returns a connection and a metadata object'''
    # We connect with the help of the PostgreSQL URL
    url = 'postgresql://{}:{}@{}:{}/{}'
    url = url.format(user, password, host, port, db)

    # The return value of create_engine() is our connection object
    con = sqlalchemy.create_engine(url, client_encoding='utf8')

    # We then bind the connection to MetaData()
    meta = sqlalchemy.MetaData(bind=con, reflect=True)

    return con, meta

if __name__ == '__main__':
    with open('admin.json') as f:
        postgres_credentials = json.load(f)
    db_engine, db_metadata = connect(postgres_credentials['username'], postgres_credentials['password'], 'parts')
    parts = sqlalchemy.Table('parts', db_metadata)
    # Example query
    '''s = select([parts]).where(parts.c.notes != '')
    for row in db_engine.execute(s):
        print row'''
    app.run('0.0.0.0')