import os
import re
import json
import requests
import sqlalchemy
from functools import wraps
from sqlalchemy.sql import select
from sqlalchemy.sql import text
from flask import Flask
from flask import render_template, send_from_directory, request, Response, send_file, session
from PIL import Image, ImageDraw
from io import BytesIO
from os import listdir
from os.path import isfile, join
from werkzeug.utils import secure_filename

app = Flask(__name__)

db_engine = {}
db_metadata = {}
parts = {}
octopartURL =""

def getContainers():
    query = "select id, name from containers order by UPPER(name);"
    r = db_engine.execute(text(query))
    containers = []
    for row in r:
        containers.append(dict(row))
    r.close()
    return containers

def check_auth(username, password):
    query = "select id, password from users where username=:usrnm;"
    r = db_engine.execute(text(query), usrnm=username)
    results = []
    for row in r:
        results.append(dict(row))
    r.close()
    if len(results)!=1:
        return False;

    if results[0]['password']==password:
        session['uid'] = results[0]['id']
        print (session['uid'])
        return True
    else:
        return False

def authenticate():
    return Response('Could not verify access level. Please retry', 401, {'WWW-Authenticate' :  'Basic realm="Login Required"'})

def requires_auth(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        auth = request.authorization
        if not auth or not check_auth(auth.username, auth.password):
            return authenticate()
        return f(*args, **kwargs)
    return decorated

def serveImage(img):
    img_io = BytesIO()
    img.convert("RGB").save(img_io, 'PNG')
    img_io.seek(0)
    return send_file(img_io, mimetype='image/png')

@app.route('/parts', strict_slashes=True)
def index():
    return render_template('partsearch.html', containers=getContainers())

@app.route('/parts/getlocationsInContainer/<containerID>')
def get_locations_in_container(containerID):
    s = 'select id, name from locations where container_id = :id order by name;'
    r = db_engine.execute(text(s), id=containerID)
    l={}
    for row in r:
        l[row[0]]= row[1];
    r.close()
    return json.dumps(l)

@app.route('/parts/getlocationURL/<locationID>')
def get_locationURL(locationID):
    s = 'select map from locations where id = :id;'
    r = db_engine.execute(text(s), id=locationID)
    l=[];
    for row in r:
        l.append(row);
    r.close()
    return l[0][0]

@app.route('/parts/locationEditor')
def locationEditor():
    query = 'select c.name as container, l.name as name, l.id, c.id as container_id from locations as l inner join containers as c on l.container_id = c.id order by container, name;'
    r = db_engine.execute(text(query))
    locations = []
    for row in r:
        locations.append(dict(row))
    r.close()
    return render_template('locationEditor.html', locations=locations, containers=getContainers())

@app.route('/parts/alterLocation/<locationID>', methods=['POST'])
@requires_auth
def alterLocation(locationID):
    locationID = int(locationID)
    s = ''
    if locationID < 0:
        # New entry
        s =  'insert into locations (name, container_id) '
        s += 'values (:name, :container);'
        s = text(s)
        r = db_engine.execute(s,name=request.form['name'],container=request.form['container']);
        r.close()
        return '{"status":"ok"}'
    else:
        # Modify entry
        s = 'update locations '
        s += 'set name=:name, container_id=:container '
        s += 'where id=:locationID;'
        s = text(s)
        r = db_engine.execute(s, name=request.form['name'],container=request.form['container'],locationID=locationID);
        r.close()
    return '{"status":"ok"}'

@app.route('/parts/getpartinfo/<partID>')
def get_part_info(partID):
    s = 'select p.id,partno,description,notes, c.name || l.name as location_descriptor, location_id, container_id, datasheet from parts as p inner join locations as l on p.location_id = l.id inner join containers as c on l.container_id = c.id where p.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('/parts/query/<filter_dummy>/<query>') # TODO: maybe change AND to OR or maybe not
def query(filter_dummy, query):
    filter = request.args.to_dict()
    keywords = query.split() # Default splits with spaces
    for i in range(len(keywords)):
        keywords[i] = '%' + keywords[i] + '%'
    kw_dict = {}
    for i in range(len(keywords)):
        kw_dict["kw" + str(i)] = keywords[i]

    s = 'select p.id,partno,description, c.name || l.name as location_descriptor from parts as p inner join locations as l on p.location_id = l.id inner join containers as c on l.container_id = c.id where '

    if filter['l'] == 'true':
        s += '('
        for i in range(len(keywords)):
            s += 'LOWER(l.name) like LOWER(:kw'+ str(i) +') AND '
        s = s[:-5]
        s += ') OR '
    if filter['p'] == 'true':
        s += '('
        for i in range(len(keywords)):
            s += 'LOWER(partno) like LOWER(:kw'+ str(i) +') AND '
        s = s[:-5]
        s += ') OR '
    if filter['d'] == 'true':
        s += '('
        for i in range(len(keywords)):
            s += 'LOWER(description) like LOWER(:kw'+ str(i) +') AND '
        s = s[:-5]
        s += ') OR '
    s = s[:-4] + ';'
    s = text(s)
    r = db_engine.execute(s, kw_dict)
    l = []
    for row in r:
        l.append(dict(row))
    r.close()
    return json.dumps(l)

@app.route('/parts/map/<containerID>')
def getMap(containerID):
    s = 'select map, overlay from containers where id = :id;'
    r = db_engine.execute(text(s), id=containerID)
    l = []
    for row in r:
        l.append(dict(row))
    mapFile = l[0]['map']
    overlayFile = l[0]['overlay']
    try:
        mapImage = Image.open('maps/' + mapFile).convert("RGBA")
        overlayImage = Image.open('maps/overlays/' + overlayFile).convert("RGBA")
    except FileNotFoundError:
        return serveImage(Image.open("maps/404.png"))
    # if request.args.get('x') is not None and request.args.get('y') is not None:
    #     x = int(request.args.get('x'))
    #     y = int(request.args.get('y'))
    #     pointer = Image.open('maps/here.png')
    #     pointerLayer = Image.new("RGBA", mapimage.size)
    #     width, height = pointer.size
    #     pointerLayer.paste(pointer, (x - int(width/2), y-int(height/2)))
    mapimage = Image.alpha_composite(mapImage, overlayImage)
    return serveImage(mapimage)


@app.route('/parts/getfile/<filename>')
def getfile(filename):
    if(re.match('^[\w\-_]+.[p|P][d|D][f|F]$', filename) == None):
        return 'No injections pls.'

    return send_from_directory('/srv/datasheets/', filename)

@app.route('/parts/alter/<partID>', methods=['POST'])
@requires_auth
def alter(partID):
    partID = int(partID)
    s = ''
    r = {}
    if partID < 0:
        # New entry
        s =  'insert into parts (partno, description, datasheet, location_id, whoadded, notes) '
        s += 'values (:partno, :description, :datasheet, :location_id, :user_id, :notes) returning id;'
        s = text(s)
        if len(request.files) != 0:
            datasheet_file = request.files['datasheet-file']
            datasheet_filename = secure_filename(datasheet_file.filename)
            i = 1
            while os.path.isfile('/srv/datasheets/' + datasheet_filename):
                datasheet_filename = datasheet_filename[:-4] + str(i) + '.pdf'
                i += 1
            datasheet_file.save('/srv/datasheets/' + datasheet_filename)
            datasheet_filename = 'http://elab.kth.se/parts/getfile/' + datasheet_filename
        # elif request.form.has_key('datasheet-url'):
        #   datasheet_filename = request.form['datasheet-url']
        else:
            try:
                datasheet_filename = request.form['datasheet-url']
            except:
                datasheet_filename = None
        r = db_engine.execute(s, partno=request.form['partno'],
                                 description=request.form['description'],
                                 datasheet=datasheet_filename,
                                 location_id=request.form['location_id'],
                                 notes=request.form['notes'],
                                 user_id=session['uid'])
    else:
        # Modify entry
        r = db_engine.execute(text('select * from parts where id=:id;'), id=partID)
        l = []
        for row in r:
            l.append(dict(row))
        r.close()
        s = 'update parts '
        s += 'set partno=:partno, description=:description, datasheet=:datasheet, location_id=:location_id, notes=:notes '
        if len(request.files) != 0:
            datasheet_file = request.files['datasheet-file']
            datasheet_filename = secure_filename(datasheet_file.filename)
            i = 1
            while os.path.isfile('/srv/datasheets/' + datasheet_filename):
                datasheet_filename = datasheet_filename[:-4] + str(i) + '.pdf'
                i += 1
            datasheet_file.save('/srv/datasheets/' + datasheet_filename)
            datasheet_filename = 'http://elab.kth.se/parts/getfile/' + datasheet_filename
            if l[0]['datasheet'] != None:
                whole_url = l[0]['datasheet']
                actual_filename = whole_url[whole_url.rfind('/') + 1:]
                os.remove('/srv/datasheets/' + actual_filename)
        else:
            try:
                datasheet_filename = request.form['datasheet-url']
            except:
                datasheet_filename = l[0]['datasheet']
        s += 'where id=:id returning id;'
        s = text(s)
        r = db_engine.execute(s, partno=request.form['partno'],
                                 description=request.form['description'],
                                 datasheet=datasheet_filename,
                                 location_id=request.form['location_id'],
                                 id=partID,
                                 notes=request.form['notes'])
    
    new_id = r.fetchone()[0]
    r.close()
    return '{"status":"ok", "part_id" : ' + str(new_id) + '}'

@app.route('/parts/delete/<partID>')
@requires_auth
def delete(partID):
    if int(partID) < 0:
        abort(400)
    s = text('delete from parts where id=:id;')
    r = db_engine.execute(s, id=partID)
    return '{"status":"ok"}'

@app.route('/parts/deleteLocation/<locationID>')
@requires_auth
def deleteLocation(locationID):
    if int(locationID) < 0:
        abort(400)
    s = text('delete from locations where id=:id;')
    r = db_engine.execute(s, id=locationID)
    return '{"status":"ok"}'

@app.route('/parts/fetchOctopartSnippet/<searchTerm>')
def fetchOctopartSnippet(searchTerm):
    if octopartURL == '':
        return '{"result":"octopart integration not enabled"}'
    args = {
        'q': searchTerm,
        'start': '0',
        'limit': 1
    }
    data = requests.get(octopartURL, params=args)
    search_response = json.loads(data.text)

    result = '{"result":"no results. sorry :(("}'
    if search_response['hits']>0:
        try:
            result = '{"result":"ok", "snippet":"' + (search_response['results'][0]['snippet']) + '"}';
        except TypeError:
            result = '{"result":"no results?"}'
    return result

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__':
    app.secret_key = 'asuiygdiahsdo[ainsfl]asfkjnb;asklnj'
    app.config['SESSION_TYPE'] = 'memcached'
    with open('admin.json') as f:
        postgres_credentials = json.load(f)
    db_engine, db_metadata = connect(postgres_credentials['username'], postgres_credentials['password'], 'parts_v2')
    parts = sqlalchemy.Table('parts', db_metadata)
    try:
        with open('octopartAPIkey.json') as f:
            j = json.load(f);
            if j['key'] is not '':
                octopartURL = j['URL'] + j['key']
                print ("Octopart credentials loaded.")
            else:
                raise FileNotFoundError
    except FileNotFoundError:
        print ("NO OCTOPART KEY FOUND. ABANDONING THAT PART")
    # Example query
    '''s = select([parts]).where(parts.c.notes != '')
    for row in db_engine.execute(s):
        print row'''
    app.run('0.0.0.0')