package com.isp.bkashautomation.parser

import java.util.regex.Pattern

data class ParsedBkashAlert(
    val trxId: String,
    val amount: Double,
    val referenceUsername: String,
    val rawText: String,
    val sender: String? = null,
    val timestamp: Long = System.currentTimeMillis()
)

object RegexParser {
    // Regex Patterns for bKash Personal & Agent Received SMS
    // Example: "You have received Tk 650.00 from 01711000001. Ref tanvir.ahmed. Fee Tk 0.00. Balance Tk 15,200.00. TrxID BK9A87X410 at 25/08/2026 18:20"
    private val TRX_PATTERN = Pattern.compile("TrxID\\s+([A-Z0-9]+)", Pattern.CASE_INSENSITIVE)
    private val AMOUNT_PATTERN = Pattern.compile("(?:Tk|Tk\\.|BDT)\\s*([0-9,]+(?:\\.[0-9]{2})?)", Pattern.CASE_INSENSITIVE)
    private val REF_PATTERN = Pattern.compile("Ref\\s+([a-zA-Z0-9._-]+)", Pattern.CASE_INSENSITIVE)

    fun parse(smsBody: String, sender: String? = null): ParsedBkashAlert? {
        val trxMatcher = TRX_PATTERN.matcher(smsBody)
        val amountMatcher = AMOUNT_PATTERN.matcher(smsBody)
        val refMatcher = REF_PATTERN.matcher(smsBody)

        val trxId = if (trxMatcher.find()) trxMatcher.group(1)?.trim() else null
        val amountStr = if (amountMatcher.find()) amountMatcher.group(1)?.replace(",", "") else null
        val rawRef = if (refMatcher.find()) refMatcher.group(1)?.trim() else null

        // Strip trailing punctuation like '.' or ';'
        val reference = rawRef?.replace(Regex("[.,;:]+$"), "")?.trim()

        if (trxId.isNullOrEmpty() || reference.isNullOrEmpty() || amountStr.isNullOrEmpty()) {
            return null
        }

        val amount = amountStr.toDoubleOrNull() ?: 0.0

        return ParsedBkashAlert(
            trxId = trxId,
            amount = amount,
            referenceUsername = reference,
            rawText = smsBody,
            sender = sender
        )
    }
}