import geojson
import json

def convert_coordinates_to_geom(coordinates, geometry_type):
    """ Returns a string with a valid PostGIS command for creating a geometry from an array of coordinates """
    if geometry_type == '__POINT__': # TODO other cases
        res = f'ST_GeomFromText(\'POINT({coordinates[0]} {coordinates[1]})\'),'

    return res

def safe_json(string):
    """ Encodes a string a json and escape single quote for postgresql""" 
    return json.dumps(string.replace("'", "''"))

def convert_feature_to_json(feature):
    """ Returns a string with a json of properties """

    res = f'"hauteur": {feature.properties["H"]},' if feature.properties["H"] else ''
    res += f'"circonference": {feature.properties["CIRC"]},' if feature.properties["CIRC"] else ''
    res += f'"etatsanitaire": {feature.properties["SANIT"]},' if feature.properties["SANIT"] else ''
    res += f'"espece": {safe_json(feature.properties["SPFR"])},' if feature.properties["SPFR"] else ''
    res += f'"remarques": {safe_json(feature.properties["COMMENTAIR"])},' if feature.properties["COMMENTAIR"] else ''

    return '\'{' + res[:-1] + '}\','

def import_geosjon_as_sql(filename, sql_filename, schema_name, table_name, column_list, values_list): 
    """ Import a geojson """
    with open(filename) as f:
        g = geojson.load(f)

        sql_f = open(sql_filename,'w')
       
        for i,f in enumerate(g['features']):
            #print(f)
            sql = f'INSERT INTO "{schema_name}"."{table_name}" ('

            col_name = ''
            col_value = ''
            for j,c in enumerate(column_list):

                if values_list[j] == '__ID__':
                    col_name += f'"{c}",'
                    col_value += f'\'{1000000 + i}\','
                elif values_list[j] == '__UUID__':
                    col_name += f'"{c}",'
                    col_value += 'uuid_generate_v4(),'
                elif values_list[j] == '__NOW__':
                    col_name += f'"{c}",'
                    col_value += 'now()::timestamptz,'
                elif values_list[j] == '__POINT__':
                    col_name += f'"{c}",'
                    col_value += convert_coordinates_to_geom(f.geometry.coordinates, values_list[j])
                elif values_list[j] == '__JSON__':
                    col_name += f'"{c}",'
                    col_value += convert_feature_to_json(f)
                elif values_list[j].startswith('properties.'):
                    col_name += f'"{c}",'
                    prop = values_list[j].split('.')[1]
                    col_value += f'\'{f.properties[prop]}\','
                else:
                    col_name += f'"{c}",'
                    col_value += f'\'{values_list[j]}\','
            
            sql += f'{col_name[:-1]}) VALUES ({col_value[:-1]});\n'

            sql_f.write(sql)

        sql_f.close()


if __name__ == '__main__':
    # import arbres.geojson into gnc_sites.t_sites
    filename = './gis/arbres.geojson'
    sql_filename =  './sql/arbres-sites.sql'
    schema_name= 'gnc_sites'
    table_name = 't_sites'
    column_list = ['id_site', 'uuid_sinp', 'id_program', 'name', 'geom', 'timestamp_create', 'id_type', 'obs_txt']
    values_list = ['__ID__', '__UUID__', '2', 'import arbres remarquables', '__POINT__', '__NOW__', '1', 'import' ]
    import_geosjon_as_sql(filename, sql_filename, schema_name, table_name, column_list, values_list)

    # import arbres.geojson into gnc_sites.t_visit
    filename = './gis/arbres.geojson'
    sql_filename =  './sql/arbres-visits.sql'
    schema_name= 'gnc_sites'
    table_name = 't_visit'
    column_list = ['id_site', 'json_data', 'timestamp_create', 'obs_txt', 'date']
    values_list = ['__ID__', '__JSON__', '__NOW__', 'import', '__NOW__']
    import_geosjon_as_sql(filename, sql_filename, schema_name, table_name, column_list, values_list)