XuqmGroup-AndroidSDK/sdk-bugcollect/src/main/java/com/xuqm/sdk/bugcollect/Fingerprint.kt

package com.xuqm.sdk.bugcollect

object Fingerprint {
    // exceptionType = exception class name (e.g. "NullPointerException"), NOT the level string
    fun compute(exceptionType: String, message: String, stack: String): String {
        val top3 = stack.lines().filter { it.trim().startsWith("at ") }.take(3).joinToString("|")
        val normalized = message.replace(Regex("\\b\\d{4,}\\b"), "N")
        return sha256("$exceptionType:$normalized:$top3")
    }

    private fun sha256(s: String): String =
        java.security.MessageDigest.getInstance("SHA-256")
            .digest(s.toByteArray())
            .joinToString("") { "%02x".format(it) }
}