from django.core.management.base import BaseCommand, CommandError

from datetime import date
from heasarc.models import INPUT_DATA_DIR
import datetime
from django.utils import timezone
import astropy
from astropy.io import ascii
import pandas as pd
import pymysql
from sqlalchemy import create_engine

from heasarc.tdat import tDat
from heasarc.models import HeasarcTable, TableColumn, HeasarcXMMSSC, HeasarcObjectClass
from heasarc.models import NSIDE_SOURCES, ORDER 

from astropy_healpix import HEALPix
from astropy.coordinates import SkyCoord  # High-level coordinates
from astropy.coordinates import ICRS, Galactic, FK4, FK5  # Low-level frames
from astropy.coordinates import Angle, Latitude, Longitude  # Angles
import astropy.units as u

def load_heasarc_table(filename):
    tdatfile=INPUT_DATA_DIR+'/dump/'+filename
    data = astropy.table.Table.read(tdatfile, format='ascii.tdat')

    keywords = data.meta['keywords']
    for key, value in keywords.items():
            print(key, '->', value)

            try:
                table=HeasarcTable.objects.get(name__exact=keywords['table_name'])
                table.delete()
            except:
                pass

            table_name=keywords['table_name']
            table = HeasarcTable(name=keywords['table_name'])
            table.description=keywords['table_description'].replace('\"', '')
            table.document_url=keywords['table_document_url']
            if 'default_search_radius' in keywords:
                table.search_radius=int(keywords['default_search_radius'])
            if 'frequency_regime' in keywords:
                table.frequency_regime=keywords['frequency_regime']
            table.observatory_name=keywords['observatory_name']
            table.security=keywords['table_security']
            if 'table_author' in keywords:
                table.author=keywords['table_author']
            if 'catalog_bibcode' in keywords:
                table.bibcode=keywords['catalog_bibcode']
            if 'declination' in keywords:
                table.declination=keywords['declination'].replace('@', '')
            if 'right_ascension' in keywords:
                table.right_ascension=keywords['right_ascension'].replace('@', '')
            table.observatory_name = keywords['observatory_name']
            if 'parameter_defaults' in keywords:
                table.parameter_defaults = keywords['parameter_defaults']
            table.save()

    cols = data.meta['cols']
    for key, value in cols.items():
        column = TableColumn(table=table)
        column.name=key
        column.tdat_type=value['type']
        column.description=value['description']
        column.save()
        print(key, '->', value)

    # convert data frame to pandas                                                                                                           
    # df = data.to_pandas()
    # sql = 'DROP TABLE IF EXISTS '+table_name+';'
    # result = engine.execute(sql)
    # Insert whole DataFrame into MySQL                                                                            
    # df.to_sql(table_name, con = engine, if_exists = 'append', chunksize = 200000)
    
    tables = HeasarcXMMSSC.objects.all()
    tables.delete()

    hp = HEALPix(nside=NSIDE_SOURCES, order=ORDER, frame=FK5())
    for item in data:

        crd = SkyCoord(item['ra'], item['dec'], frame=FK5(), unit="deg")
        healpix = hp.skycoord_to_healpix(crd)
 
        obj = HeasarcXMMSSC.objects.create(healpix=healpix, 
                                           ra=item['ra'],
                                           dec=item['dec'],
                                           lii=item['lii'],
                                           bii=item['bii'],
                                           error_radius=item['error_radius'],
                                           name=item['name'],
                                           detid=item['detid'],
                                           srcid=item['srcid'],
                                           time = item['time'],
                                           end_time = item['end_time'],
                                           ep_8_flux = item['ep_8_flux'],
                                           ep_8_flux_error = item['ep_8_flux_error'],
                                           pn_8_flux = item['pn_8_flux'],
                                           pn_8_flux_error = item['pn_8_flux_error'],
                                           m1_8_flux = item['m1_8_flux'],
                                           m1_8_flux_error = item['m1_8_flux_error'],
                                           m2_8_flux = item['m2_8_flux'],
                                           m2_8_flux_error = item['m2_8_flux_error'],
                                           ep_1_flux = item['ep_1_flux'],
                                           ep_1_flux_error = item['ep_1_flux_error'],
                                           ep_2_flux = item['ep_2_flux'],
                                           ep_2_flux_error = item['ep_2_flux_error'],
                                           ep_3_flux = item['ep_3_flux'],
                                           ep_3_flux_error = item['ep_3_flux_error'],
                                           sum_flag = item['sum_flag'],
                                           sc_extent = item['sc_extent'],
                                           sc_ext_ml = item['sc_ext_ml'])
        obj.save()

    print('--> Successfully loaded "%s"' % table_name)
    pass

class Command(BaseCommand):
    help = 'Initiates data dase'

#    def add_arguments(self, parser):
#        parser.add_argument('poll_id', nargs='+', type=int)

    def handle(self, *args, **options):
        
        # create sqlalchemy engine 
#        engine = create_engine("mysql+pymysql://{user}:{pw}@localhost/{db}"
#                               .format(user="heauser",
#                                       pw="srg2019@L2_heasarc",
#                                       db="heasarc_db"))

#        engine = create_engine("postgresql://{user}:{pw}@localhost/{db}"
#                               .format(user="heauser",
#                                       pw="srg2019@L2_heasarc",
#                                       db="heasarc_db"))



        load_heasarc_table('heasarc_xmmssc.tdat.gz')
        return

        hp = HEALPix(nside=NSIDE_SOURCES, order=ORDER, frame=FK5())
        # update healpix only
        srcs = HeasarcXMMSSC.objects.all()
        for src in srcs:
            crd = SkyCoord(src.ra, src.dec, frame=FK5(), unit="deg")
            src.healpix = hp.skycoord_to_healpix(crd)
            src.save()

        self.stdout.write(self.style.SUCCESS('Done'))