/*
 * Copyright (C) 2025 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.eyedroppertester

import android.content.Intent
import android.graphics.Color
import android.os.Bundle
import android.util.Log
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.activity.viewModels
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material3.Surface
import androidx.compose.runtime.getValue
import androidx.compose.ui.Modifier
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import com.android.eyedroppertester.ui.LaunchEyeDropperScreen
import com.android.eyedroppertester.ui.MainViewModel

private const val TAG = "TestMainActivity"

/**
 * The entry point activity that starts EyeDropper and observes the ColorState
 * to trigger recomposition when a new color is received as a result.
 */
class MainActivity : ComponentActivity() {
    private val mainViewModel: MainViewModel by viewModels()
    private val activityLauncher =
        registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
            if (result.resultCode == RESULT_OK) {
                val colorInt = result.data?.getIntExtra(Intent.EXTRA_COLOR, Color.BLACK)
                mainViewModel.updateColor(colorInt ?: Color.BLACK)
                Log.d(TAG, "resultCode == OK, set color to $colorInt")
            } else {
                mainViewModel.resetColor()
                Log.d(TAG, "resultCode != OK, resetting color.")
            }
        }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            // Collect Flow into Compose State, only when Lifecycle is minActiveState=STARTED
            val uiColorState by mainViewModel.uiColorState.collectAsStateWithLifecycle()
            Surface(
                modifier = Modifier.fillMaxSize(),
            ) {
                LaunchEyeDropperScreen(
                    uiColorState,
                    onClick = { launchEyeDropper(activityLauncher) }
                )
            }
        }
    }

    private fun launchEyeDropper(launcher: ActivityResultLauncher<Intent>) {
        // Explicit intent to launch EyeDropper
        // TODO: b/399172476 - Add `OPEN_EYE_DROPPER` to Intent class.
        val eyeDropperIntent = Intent(Intent.ACTION_OPEN_EYE_DROPPER)
        Log.d(TAG, "EyeDropper launched")
        launcher.launch(eyeDropperIntent)
    }
}