IncomeTaxSystem/AppCode/ITATHandler.py

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

class ITATHandler:

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

    # GET ALL ITAT RECORDS (PROC)
    def get_all_itat(self):
        self.cursor.callproc("GetAllITAT")
        records = []
        for result in self.cursor.stored_results():
            records = result.fetchall()
        return records


    # GET ITAT BY ID (PROC)
    def get_itat_by_id(self, id):
        self.cursor.callproc("GetITATById", [id])
        records = []
        for result in self.cursor.stored_results():
            records = result.fetchall()
        if records:
            return records[0]
        return None


    # INSERT ITAT (PROC)
    def add_itat(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', 'per_tax_a', 'tax_a_cal', 'per_surcharge_a', 'surcharge_a_cal', 'per_cess_a', 'edu_cess_a_cal', 'sum_of_a', 
                        'per_tax_b', 'tax_b_cal', 'per_surcharge_b', 'surcharge_b_cal', 'per_cess_b', 'edu_cess_b_cal', 'sum_of_b',
                        'tax_payable','total_tax_payable', 'opening_balance', 'mat_credit_created', 'mat_credit_utilized', 'closing_balance', 
                        'interest_234c', 'total_tax', 'advance_tax', 'tds', 'tcs', 'sat', 'tax_on_assessment', 'refund', 
                        'interest_244a_per143', 'refund_received', 'balance_receivable', 'remarks', 'created_at'
                    ]

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

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

    # UPDATE ITAT (PROC)
    def update_itat(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', 'per_tax_a', 'tax_a_cal', 'per_surcharge_a', 'surcharge_a_cal', 'per_cess_a', 'edu_cess_a_cal', 'sum_of_a', 
                'per_tax_b', 'tax_b_cal', 'per_surcharge_b', 'surcharge_b_cal', 'per_cess_b', 'edu_cess_b_cal', 'sum_of_b',
                'tax_payable','total_tax_payable', 'opening_balance', 'mat_credit_created', 'mat_credit_utilized', 'closing_balance', 
                'interest_234c', 'total_tax', 'advance_tax', 'tds', 'tcs', 'sat', 'tax_on_assessment', 'refund', 
                'interest_244a_per143', 'refund_received', 'balance_receivable', 'remarks', 'updated_at'
            ]
        values = [id] + [data.get(col, 0) for col in columns]  

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

    # DELETE ITAT BY ID (PROC)
    def delete_itat_by_id(self, id):
        self.cursor.callproc("DeleteITATById", [id])
        self.conn.commit()


    def itat_report_download(self, selected_year):
        try:
            # AY calculation (2020 -> AY 2020-2021)
            ay_start = int(selected_year)
            ay_end = ay_start + 1
            assessment_year = f"AY {ay_start}-{ay_end}"

            # Fetch ITAT data
            self.cursor.callproc("GetITATByYear", [selected_year])
            rows = []
            for result in self.cursor.stored_results():
                rows = result.fetchall()

            if not rows:
                return None

            # Remove id column if exists
            for row in rows:
                row.pop("id", None)

            # Mapping DB fields → readable Excel labels
            field_mapping = {
                "gross_total_income": "Gross Total Income",
                "disallowance_14a": "Add: Disallowance u/s 14A",
                "disallowance_37": "Add: Disallowance u/s 37",
                "-" : "-",
                "deduction_80ia_business": "Less: Deduction u/s 80IA - On Business Income",
                "deduction_80ia_misc": "On Misc Receipts",
                "deduction_80ia_other": "On Other",
                "deduction_sec37_disallowance": "On Sec 37 Disallowance",
                "deduction_80g": "Less: Deduction u/s 80G",
                "net_taxable_income": "Net Taxable Income",
                "--" : "-",
                "per_tax_a" : "Per% Tax @(A)",
                "tax_a_cal" : "Tax cal(A)",
                "per_surcharge_a" : "Per% surcharge @(A)",
                "surcharge_a_cal" : "Surcharge cal (A)",
                "per_cess_a" : "Per% cess(A)",
                "edu_cess_a_cal" : "Edu cess cal(A)",
                "sum_of_a" : "Sum of tax_cal(A)",
                "---" : "-",
                "per_tax_b" : "Per% Tax @(B)",
                "tax_b_cal" : "Tax cal(B)",
                "per_surcharge_b" : "Per% surcharge @(B)",
                "surcharge_b_cal" : "Surcharge cal (B)",
                "per_cess_b" : "Per% cess(B)",
                "edu_cess_b_cal" : "Edu cess cal(B)",
                "sum_of_b" : "Sum of tax_cal(B)",
                "tax_payable": "Tax Payable",
                "total_tax_payable": "Total Tax Payable",
                "opening_balance": "Opening Balance",
                "mat_credit_created": "Add: MAT Credit Created",
                "mat_credit_utilized": "Less: MAT Credit Utilized",
                "closing_balance": "Closing Balance",
                "interest_234c": "Add: Interest u/s 234C",
                "total_tax": "Total Tax",
                "advance_tax": "Advance Tax",
                "tds": "TDS",
                "tcs": "TCS",
                "sat": "SAT",
                "tax_on_assessment": "Tax on Regular Assessment",
                "refund" : "Refund",
                "interest_244a_per143" : "Add : Interest u/s 244A as per 143",
                "refund_received" : "Less : Refund Received on",
                "balance_receivable" : "Balance Receivable",
                "Remarks" : "Remarks"
            }
            
            # Vertical ITAT structure
            data = []
            for key, label in field_mapping.items():
                value = rows[0].get(key, 0)
                data.append([label, value])

            df = pd.DataFrame(data, columns=["Particulars", "ITAT"])

            # Excel output
            output = io.BytesIO()
            with pd.ExcelWriter(output, engine="xlsxwriter") as writer:
                workbook = writer.book
                worksheet = workbook.add_worksheet("ITAT Report")
                writer.sheets["ITAT Report"] = worksheet

                # Formats
                title_fmt = workbook.add_format({
                    "bold": True,
                    "align": "center",
                    "font_size": 14
                })
                header_fmt = workbook.add_format({
                    "bold": True,
                    "border": 1,
                    "align": "center"
                })
                text_fmt = workbook.add_format({"border": 1})
                num_fmt = workbook.add_format({
                    "border": 1,
                    "num_format": "#,##0.00"
                })

                # Company Name
                worksheet.merge_range(
                    "A1:B1",
                    "Laxmi Civil Engineering Services Pvt Ltd",
                    title_fmt
                )

                # Assessment Year
                worksheet.merge_range(
                    "A2:B2",
                    f"Assessment Year : {assessment_year}",
                    workbook.add_format({"bold": True, "align": "center"})
                )

                # Header
                worksheet.write_row("A4", ["Particulars", "ITAT"], header_fmt)

                # Data rows
                row_no = 4
                for _, row in df.iterrows():
                    worksheet.write(row_no, 0, row["Particulars"], text_fmt)
                    worksheet.write(row_no, 1, row["ITAT"], num_fmt)
                    row_no += 1

                # Column widths
                worksheet.set_column("A:A", 45)
                worksheet.set_column("B:B", 20)

            output.seek(0)
            return output

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


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