from AppCode.Config import DBConfig
import mysql.connector
import pandas as pd
import io



class CITHandler:

    def __init__(self):
        db = DBConfig()
        self.conn = db.get_db_connection()
        self.cursor = self.conn.cursor(dictionary=True)

    # GET ALL CIT RECORDS
    def get_all_cit(self):
        self.cursor.callproc("GetAllCIT")
        records = []

        for result in self.cursor.stored_results():
            records = result.fetchall()

        return records

    # GET CIT BY ID
    def get_cit_by_id(self, id):
        self.cursor.callproc("GetCITById", [id])
        records = []

        for result in self.cursor.stored_results():
            records = result.fetchall()

        if records:
            return records[0]

        return None

    # INSERT CIT RECORD
    def add_cit(self, data):
        columns = [
            'year', 'gross_total_income', 'disallowance_14a', 'disallowance_37',
            'deduction_80ia_business', 'deduction_80ia_misc', 'deduction_80ia_other',
            'deduction_sec37_disallowance', 'deduction_80g', 'net_taxable_income',
            'tax_30_percent', 'tax_book_profit_18_5', 'tax_payable', 'surcharge_12',
            'edu_cess_3', 'total_tax_payable', 'mat_credit', 'interest_234c',
            'total_tax', 'advance_tax', 'tds', 'tcs','sat', 'tax_on_assessment', 'refund', 'Remarks'
        ]

        values = [data.get(col, 0) for col in columns]

        self.cursor.callproc("InsertCIT", values)
        self.conn.commit()


  
    # UPDATE CIT RECORD
    def update_cit(self, id, data):
        columns = [
            'year', 'gross_total_income', 'disallowance_14a', 'disallowance_37',
            'deduction_80ia_business', 'deduction_80ia_misc', 'deduction_80ia_other',
            'deduction_sec37_disallowance', 'deduction_80g', 'net_taxable_income',
            'tax_30_percent', 'tax_book_profit_18_5', 'tax_payable', 'surcharge_12',
            'edu_cess_3', 'total_tax_payable', 'mat_credit', 'interest_234c',
            'total_tax', 'advance_tax', 'tds', 'tcs','sat', 'tax_on_assessment', 'refund', 'Remarks'
        ]

        values = [id] + [data.get(col, 0) for col in columns]

        self.cursor.callproc("UpdateCITById", values)
        self.conn.commit()



    # DELETE CIT RECORD
    def delete_cit(self, id):
        self.cursor.callproc("DeleteCITById", [id])
        self.conn.commit()

    # CLOSE CONNECTION
    def close(self):
        self.cursor.close()
        self.conn.close()


    def cit_report_download(self, selected_year):
            try:
                # Call stored procedure
                self.cursor.callproc("GetCITByYear", [selected_year])

                rows = []
                for result in self.cursor.stored_results():
                    rows = result.fetchall()

                if not rows:
                    return None

                df = pd.DataFrame(rows)

                # Excel output
                output = io.BytesIO()
                with pd.ExcelWriter(output, engine="xlsxwriter") as writer:

                    for i, (_, row) in enumerate(df.iterrows(), start=1):
                        # Convert row to vertical format
                        vertical_df = pd.DataFrame(row).reset_index()
                        vertical_df.columns = ['Field', 'Value']

                        start_row = (i - 1) * (len(vertical_df) + 3)  # gap between blocks
                        vertical_df.to_excel(
                            writer,
                            sheet_name='CIT_Report',
                            index=False,
                            startrow=start_row
                        )

                output.seek(0)
                return output

            except mysql.connector.Error as e:
                print("MySQL Error:", e)
                return None