package org.terst.nav

import android.app.Application
import com.google.firebase.crashlytics.FirebaseCrashlytics
import java.io.File
import java.io.PrintWriter
import java.io.StringWriter
import java.text.SimpleDateFormat
import java.util.Date
import java.util.Locale

class NavApplication : Application() {

    companion object {
        var isTesting: Boolean = false
    }

    override fun onCreate() {
        super.onCreate()
        FirebaseCrashlytics.getInstance().sendUnsentReports()
        installCrashLogger()
    }

    private fun installCrashLogger() {
        val default = Thread.getDefaultUncaughtExceptionHandler()
        Thread.setDefaultUncaughtExceptionHandler { thread, throwable ->
            try {
                writeCrashLog(thread, throwable)
            } catch (_: Exception) {
                // never suppress the original crash
            }
            default?.uncaughtException(thread, throwable)
        }
    }

    private fun writeCrashLog(thread: Thread, throwable: Throwable) {
        val sw = StringWriter()
        throwable.printStackTrace(PrintWriter(sw))
        val timestamp = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(Date())
        val body = buildString {
            appendLine("=== Nav Crash Log ===")
            appendLine("Time   : $timestamp")
            appendLine("Thread : ${thread.name}")
            appendLine("Device : ${android.os.Build.MODEL} (API ${android.os.Build.VERSION.SDK_INT})")
            appendLine()
            append(sw)
        }

        // Try external storage first (readable without root)
        val dir = getExternalFilesDir(null) ?: filesDir
        val file = File(dir, "crash_${timestamp}.txt")
        file.writeText(body)

        // Also overwrite a fixed-name "latest" file for easy access
        File(dir, "crash_latest.txt").writeText(body)
    }
}