package com.mrousavy.camera

import android.Manifest
import android.content.Context
import android.content.pm.PackageManager
import android.hardware.camera2.CameraCharacteristics
import android.hardware.camera2.CameraManager
import android.media.ImageReader
import android.media.MediaRecorder
import android.os.Build
import android.util.Log
import androidx.camera.core.CameraSelector
import androidx.camera.core.ImageCapture
import androidx.camera.extensions.HdrImageCaptureExtender
import androidx.camera.extensions.NightImageCaptureExtender
import androidx.core.content.ContextCompat
import com.mrousavy.camera.parsers.*
import com.mrousavy.camera.utils.*
import com.facebook.react.bridge.*
import com.facebook.react.modules.core.PermissionAwareActivity
import com.facebook.react.modules.core.PermissionListener
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch

class CameraViewModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {
    companion object {
        const val REACT_CLASS = "CameraView"
        var RequestCode = 10

        fun parsePermissionStatus(status: Int): String {
            return when(status) {
                PackageManager.PERMISSION_DENIED -> "denied"
                PackageManager.PERMISSION_GRANTED -> "authorized"
                else -> "not-determined"
            }
        }
    }

    override fun getName(): String {
        return REACT_CLASS
    }

    private fun findCameraView(id: Int): CameraView = reactApplicationContext.currentActivity?.findViewById(id) ?: throw ViewNotFoundError(id)

    @ReactMethod
    fun takePhoto(viewTag: Int, options: ReadableMap, promise: Promise) {
        GlobalScope.launch(Dispatchers.Main) {
            withPromise(promise) {
                val view = findCameraView(viewTag)
                view.takePhoto(options)
            }
        }
    }

    @ReactMethod
    fun takeSnapshot(viewTag: Int, options: ReadableMap, promise: Promise) {
        GlobalScope.launch(Dispatchers.Main) {
            withPromise(promise) {
                val view = findCameraView(viewTag)
                view.takeSnapshot(options)
            }
        }
    }

    // TODO: startRecording() cannot be awaited, because I can't have a Promise and a onRecordedCallback in the same function. Hopefully TurboModules allows that
    @ReactMethod(isBlockingSynchronousMethod = true)
    fun startRecording(viewTag: Int, options: ReadableMap, onRecordCallback: Callback) {
        GlobalScope.launch(Dispatchers.Main) {
            val view = findCameraView(viewTag)
            view.startRecording(options, onRecordCallback)
        }
    }

    @ReactMethod
    fun stopRecording(viewTag: Int, promise: Promise) {
        withPromise(promise) {
            val view = findCameraView(viewTag)
            view.stopRecording()
            return@withPromise null
        }
    }

    @ReactMethod
    fun focus(viewTag: Int, point: ReadableMap, promise: Promise) {
        GlobalScope.launch(Dispatchers.Main) {
            withPromise(promise) {
                val view = findCameraView(viewTag)
                view.focus(point)
                return@withPromise null
            }
        }
    }

    @ReactMethod
    fun getAvailableVideoCodecs(viewTag: Int, promise: Promise) {
        withPromise(promise) {
            val view = findCameraView(viewTag)
            view.getAvailableVideoCodecs()
        }
    }

    @ReactMethod
    fun getAvailablePhotoCodecs(viewTag: Int, promise: Promise) {
        withPromise(promise) {
            val view = findCameraView(viewTag)
            view.getAvailablePhotoCodecs()
        }
    }

    // TODO: This uses the Camera2 API to list all characteristics of a camera device and therefore doesn't work with Camera1. Find a way to use CameraX for this
    @ReactMethod
    fun getAvailableCameraDevices(promise: Promise) {
        withPromise(promise) {
            val manager = reactApplicationContext.getSystemService(Context.CAMERA_SERVICE) as? CameraManager
                    ?: throw CameraManagerUnavailableError()

            val cameraDevices: WritableArray = Arguments.createArray()

            manager.cameraIdList.forEach loop@{ id ->
                val cameraSelector = CameraSelector.Builder().byID(id).build()
                // TODO: ImageCapture.Builder - I'm not setting the target resolution, does that matter?
                val imageCaptureBuilder = ImageCapture.Builder()

                val characteristics = manager.getCameraCharacteristics(id)
                val hardwareLevel = characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)!!

                // Filters out cameras that are LEGACY hardware level. Those don't support Preview + Photo Capture + Video Capture at the same time.
                if (hardwareLevel == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
                    Log.i(REACT_CLASS, "Skipping Camera #${id} because it does not meet the minimum requirements for react-native-vision-camera. " +
                            "See the tables at https://developer.android.com/reference/android/hardware/camera2/CameraDevice#regular-capture for more information.")
                    return@loop
                }

                val capabilities = characteristics.get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES)!!
                val isMultiCam = Build.VERSION.SDK_INT >= Build.VERSION_CODES.P &&
                        capabilities.contains(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_LOGICAL_MULTI_CAMERA)
                val deviceTypes = characteristics.getDeviceTypes()

                val cameraConfig = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)!!
                val lensFacing = characteristics.get(CameraCharacteristics.LENS_FACING)!!
                val hasFlash = characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE)!!
                val maxScalerZoom = characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM)!!
                val supportsDepthCapture = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
                        capabilities.contains(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_DEPTH_OUTPUT)
                val supportsRawCapture = capabilities.contains(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_RAW)
                val isoRange = characteristics.get(CameraCharacteristics.SENSOR_INFO_SENSITIVITY_RANGE)
                val stabilizationModes = characteristics.get(CameraCharacteristics.CONTROL_AVAILABLE_VIDEO_STABILIZATION_MODES)!! // only digital, no optical
                val zoomRange = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R)
                    characteristics.get(CameraCharacteristics.CONTROL_ZOOM_RATIO_RANGE)
                else null
                val name = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P)
                    characteristics.get(CameraCharacteristics.INFO_VERSION)
                else null
                val fpsRanges = characteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES)!!

                var supportsHdr = false
                var supportsLowLightBoost = false
                try {
                    val hdrExtension = HdrImageCaptureExtender.create(imageCaptureBuilder)
                    supportsHdr = hdrExtension.isExtensionAvailable(cameraSelector)

                    val nightExtension = NightImageCaptureExtender.create(imageCaptureBuilder)
                    supportsLowLightBoost = nightExtension.isExtensionAvailable(cameraSelector)
                } catch (e: Throwable) {
                    // error on checking availability. falls back to "false"
                    Log.e(REACT_CLASS, "Failed to check HDR/Night Mode extension availability.", e)
                }

                val fieldOfView = characteristics.getFieldOfView()

                val map = Arguments.createMap()
                val formats = Arguments.createArray()
                map.putString("id", id)
                map.putArray("devices", deviceTypes)
                map.putString("position", parseLensFacing(lensFacing))
                map.putString("name", name ?: "${parseLensFacing(lensFacing)} ($id)")
                map.putBoolean("hasFlash", hasFlash)
                map.putBoolean("hasTorch", hasFlash)
                map.putBoolean("isMultiCam", isMultiCam)
                map.putBoolean("supportsRawCapture", supportsRawCapture)
                map.putBoolean("supportsDepthCapture", supportsDepthCapture)
                map.putBoolean("supportsLowLightBoost", supportsLowLightBoost)
                if (zoomRange != null) {
                    map.putDouble("minZoom", zoomRange.lower.toDouble())
                    map.putDouble("maxZoom", zoomRange.upper.toDouble())
                } else {
                    map.putDouble("minZoom", 1.0)
                    map.putDouble("maxZoom", maxScalerZoom.toDouble())
                }
                map.putDouble("neutralZoom", characteristics.neutralZoomPercent.toDouble())

                val maxImageOutputSize = cameraConfig.getOutputSizes(ImageReader::class.java).maxByOrNull { it.width * it.height }!!

                // TODO: Should I really check MediaRecorder::class instead of SurfaceView::class?
                // Recording should always be done in the most efficient format, which is the format native to the camera framework
                cameraConfig.getOutputSizes(MediaRecorder::class.java).forEach { size ->
                    val isHighestPhotoQualitySupported = areUltimatelyEqual(size, maxImageOutputSize)

                    // Get the number of seconds that each frame will take to process
                    val secondsPerFrame = cameraConfig.getOutputMinFrameDuration(MediaRecorder::class.java, size) / 1_000_000_000.0

                    val frameRateRanges = Arguments.createArray()
                    if (secondsPerFrame > 0) {
                        val fps = (1.0 / secondsPerFrame).toInt()
                        val frameRateRange = Arguments.createMap()
                        frameRateRange.putInt("minFrameRate", 1)
                        frameRateRange.putInt("maxFrameRate", fps)
                        frameRateRanges.pushMap(frameRateRange)
                    }
                    fpsRanges.forEach { range ->
                        val frameRateRange = Arguments.createMap()
                        frameRateRange.putInt("minFrameRate", range.lower)
                        frameRateRange.putInt("maxFrameRate", range.upper)
                        frameRateRanges.pushMap(frameRateRange)
                    }

                    // TODO Revisit getAvailableCameraDevices (colorSpaces, more than YUV?)
                    val colorSpaces = Arguments.createArray()
                    colorSpaces.pushString("yuv")

                    // TODO Revisit getAvailableCameraDevices (more accurate video stabilization modes)
                    val videoStabilizationModes = Arguments.createArray()
                    if (stabilizationModes.contains(CameraCharacteristics.CONTROL_VIDEO_STABILIZATION_MODE_OFF))
                        videoStabilizationModes.pushString("off")
                    if (stabilizationModes.contains(CameraCharacteristics.CONTROL_VIDEO_STABILIZATION_MODE_ON)) {
                        videoStabilizationModes.pushString("auto")
                        videoStabilizationModes.pushString("standard")
                    }

                    val format = Arguments.createMap()
                    format.putDouble("photoHeight", size.height.toDouble())
                    format.putDouble("photoWidth", size.width.toDouble())
                    format.putDouble("videoHeight", size.height.toDouble()) // TODO: Revisit getAvailableCameraDevices (videoHeight == photoHeight?)
                    format.putDouble("videoWidth", size.width.toDouble()) // TODO: Revisit getAvailableCameraDevices (videoWidth == photoWidth?)
                    format.putBoolean("isHighestPhotoQualitySupported", isHighestPhotoQualitySupported)
                    format.putInt("maxISO", isoRange?.upper)
                    format.putInt("minISO", isoRange?.lower)
                    format.putDouble("fieldOfView", fieldOfView) // TODO: Revisit getAvailableCameraDevices (is fieldOfView accurate?)
                    format.putDouble("maxZoom", (zoomRange?.upper ?: maxScalerZoom).toDouble())
                    format.putArray("colorSpaces", colorSpaces)
                    format.putBoolean("supportsVideoHDR", false) // TODO: supportsVideoHDR
                    format.putBoolean("supportsPhotoHDR", supportsHdr)
                    format.putArray("frameRateRanges", frameRateRanges)
                    format.putString("autoFocusSystem", "none") // TODO: Revisit getAvailableCameraDevices (autoFocusSystem) (CameraCharacteristics.CONTROL_AF_AVAILABLE_MODES or CameraCharacteristics.LENS_INFO_FOCUS_DISTANCE_CALIBRATION)
                    format.putArray("videoStabilizationModes", videoStabilizationModes)
                    formats.pushMap(format)
                }

                map.putArray("formats", formats)
                cameraDevices.pushMap(map)
            }

            return@withPromise cameraDevices
        }
    }

    @ReactMethod
    fun getCameraPermissionStatus(promise: Promise) {
        val status = ContextCompat.checkSelfPermission(reactApplicationContext, Manifest.permission.CAMERA)
        promise.resolve(parsePermissionStatus(status))
    }

    @ReactMethod
    fun getMicrophonePermissionStatus(promise: Promise) {
        val status = ContextCompat.checkSelfPermission(reactApplicationContext, Manifest.permission.RECORD_AUDIO)
        promise.resolve(parsePermissionStatus(status))
    }

    @ReactMethod
    fun requestCameraPermission(promise: Promise) {
        val activity = reactApplicationContext.currentActivity
        if (activity is PermissionAwareActivity) {
            val currentRequestCode = RequestCode
            RequestCode++
            val listener = PermissionListener { requestCode: Int, _: Array<String>, grantResults: IntArray ->
                if (requestCode == currentRequestCode) {
                    val permissionStatus = grantResults[0]
                    promise.resolve(parsePermissionStatus(permissionStatus))
                    return@PermissionListener true
                }
                return@PermissionListener false
            }
            activity.requestPermissions(arrayOf(Manifest.permission.CAMERA), currentRequestCode, listener)
        } else {
            promise.reject("NO_ACTIVITY", "No PermissionAwareActivity was found! Make sure the app has launched before calling this function.")
        }
    }

    @ReactMethod
    fun requestMicrophonePermission(promise: Promise) {
        val activity = reactApplicationContext.currentActivity
        if (activity is PermissionAwareActivity) {
            val currentRequestCode = RequestCode
            RequestCode++
            val listener = PermissionListener { requestCode: Int, _: Array<String>, grantResults: IntArray ->
                if (requestCode == currentRequestCode) {
                    val permissionStatus = grantResults[0]
                    promise.resolve(parsePermissionStatus(permissionStatus))
                    return@PermissionListener true
                }
                return@PermissionListener false
            }
            activity.requestPermissions(arrayOf(Manifest.permission.RECORD_AUDIO), currentRequestCode, listener)
        } else {
            promise.reject("NO_ACTIVITY", "No PermissionAwareActivity was found! Make sure the app has launched before calling this function.")
        }
    }
}