package com.dmc.callcrm.ui

import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.telephony.SubscriptionManager
import android.widget.LinearLayout
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import com.dmc.callcrm.R
import com.dmc.callcrm.data.Prefs

/**
 * Lets the user pick which SIM this phone's registration should be locked to.
 * Saves the chosen slot into Prefs.simSlot, which SimUtil/CallStats/
 * RecordingScanner/Syncer all read to filter out the other SIM's calls.
 * Registration itself never asks for this, so this screen is how it gets set.
 */
class ChooseSimActivity : AppCompatActivity() {

    private lateinit var prefs: Prefs

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_choose_sim)
        prefs = Prefs(this)

        val list = findViewById<LinearLayout>(R.id.simList)
        val statusText = findViewById<TextView>(R.id.statusText)

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE)
            != PackageManager.PERMISSION_GRANTED) {
            statusText.setTextColor(0xFFDC2626.toInt())
            statusText.text = "Phone permission is needed to list SIMs. Grant it from Settings and reopen this screen."
            return
        }

        val subManager = getSystemService(SubscriptionManager::class.java)
        val subs = try { subManager?.activeSubscriptionInfoList } catch (_: SecurityException) { null }

        if (subs.isNullOrEmpty()) {
            statusText.setTextColor(0xFFDC2626.toInt())
            statusText.text = "Couldn't read SIM info on this device."
            return
        }

        for (sub in subs) {
            val slot = sub.simSlotIndex
            val label = "SIM ${slot + 1}: ${sub.displayName ?: sub.carrierName ?: "Unknown carrier"}"
            list.addView(makeRow(label, slot, slot == prefs.simSlot) {
                prefs.simSlot = slot
                statusText.setTextColor(0xFF16A34A.toInt())
                statusText.text = "Saved — this phone will now only sync/record SIM ${slot + 1}."
                refreshSelection(list, slot)
            })
        }

        // Escape hatch: go back to "don't filter, use both SIMs."
        list.addView(makeRow("Don't filter — use both SIMs", -1, prefs.simSlot < 0) {
            prefs.simSlot = -1
            statusText.setTextColor(0xFF16A34A.toInt())
            statusText.text = "Saved — both SIMs will be synced/recorded again."
            refreshSelection(list, -1)
        })
    }

    private fun refreshSelection(list: LinearLayout, selectedSlot: Int) {
        for (i in 0 until list.childCount) {
            val row = list.getChildAt(i)
            val isSelected = row.tag == selectedSlot
            row.setBackgroundColor(if (isSelected) 0xFFDCFCE7.toInt() else 0xFFFFFFFF.toInt())
        }
    }

    private fun makeRow(label: String, slot: Int, selected: Boolean, onClick: () -> Unit): TextView {
        return TextView(this).apply {
            text = (if (selected) "✓  " else "◯  ") + label
            textSize = 15f
            setTextColor(0xFF0F172A.toInt())
            setPadding(20, 20, 20, 20)
            setBackgroundColor(if (selected) 0xFFDCFCE7.toInt() else 0xFFFFFFFF.toInt())
            val params = LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)
            params.bottomMargin = 10
            layoutParams = params
            tag = slot
            setOnClickListener {
                onClick()
                Toast.makeText(context, "Saved", Toast.LENGTH_SHORT).show()
            }
        }
    }
}