#!/bin/python3
import pandas as pd
from argparse import ArgumentParser

# Wraps strings and timestamps into single quotes
def wrap_types(val):
    if type(val) in [str, pd._libs.tslibs.timestamps.Timestamp] and val != "NULL":
        return f"'{val}'"
    else:
        return val

p = ArgumentParser()
p.add_argument("-i", "--input", nargs="+", help="Path to input excel file")
p.add_argument("-o", "--output", nargs="+", help="Path to output sql file")
args = p.parse_args()

# Manual fallback if argument is not specified
if not args.input:
    in_file_path = input("Please enter path to input excel file: ")
else:
    in_file_path = args.input[0]

if not args.output:
    out_file_path = input("Please enter path to output sql file: ")
else:
    out_file_path = args.output[0]

# Simple input argument checks
if out_file_path.endswith(("xlsx", "xls")):
    print("Aborting task. Possible overwrite of source file detected.")
    print(f"Specified output file '{out_file_path}' ends with .xls/.xlsx")
    exit(1)

if not in_file_path.endswith(("xlsx", "xls")):
    print("Aborting task. No input file in excel format specified.")
    exit(1)

print(f'Input: {in_file_path}\nOutput: {out_file_path}')

in_file = pd.ExcelFile(in_file_path)

with open(out_file_path, "w") as of:
    for sheet in in_file.sheet_names:
        print(f'Processing sheet "{sheet}"...')
        db_table = in_file.parse(sheet, nrows=1, header=None)[0][0]
        curr_sheet = in_file.parse(sheet, header=1).fillna("NULL")
        count = 0
        # One line is one test subject/object
        for line in curr_sheet.iterrows():
            indices = line[1].index
            values = line[1].values
            cols = ""
            vals = ""
            for i in range(len(indices)):
                if i != 0:
                    cols += f', "{indices[i]}"'
                    vals += f', {wrap_types(values[i])}'
                else:
                    cols += f'"{indices[i]}"'
                    vals += f'{wrap_types(values[i])}'
            # INSERT INTO $DB.$TABLE ($COL1, $COL2, ...) VALUES ($VAL1, $VAL2, ...)
            of.write(f'INSERT INTO {db_table} ({cols}) VALUES ({vals});\n')
            count += 1
        print(f'Created {count} INSERT statements for sheet "{sheet}"\n')