package exh.ui.intercept

import android.content.Intent
import android.os.Bundle
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import androidx.lifecycle.lifecycleScope
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import eu.kanade.presentation.components.AppBar
import eu.kanade.presentation.components.Scaffold
import eu.kanade.tachiyomi.R
import eu.kanade.tachiyomi.source.online.UrlImportableSource
import eu.kanade.tachiyomi.ui.base.activity.BaseActivity
import eu.kanade.tachiyomi.ui.main.MainActivity
import eu.kanade.tachiyomi.ui.reader.ReaderActivity
import eu.kanade.tachiyomi.util.view.setComposeContent
import exh.GalleryAddEvent
import exh.GalleryAdder
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.launchIn
import kotlinx.coroutines.flow.onEach
import kotlinx.coroutines.launch
import tachiyomi.core.Constants
import tachiyomi.domain.chapter.model.Chapter
import tachiyomi.domain.manga.model.Manga

class InterceptActivity : BaseActivity() {
    private var statusJob: Job? = null

    private val status: MutableStateFlow<InterceptResult> = MutableStateFlow(InterceptResult.Idle)

    override fun onCreate(savedInstanceState: Bundle?) {
        overridePendingTransition(R.anim.shared_axis_x_push_enter, R.anim.shared_axis_x_push_exit)
        super.onCreate(savedInstanceState)

        setComposeContent {
            InterceptActivityContent(status.collectAsState().value)
        }

        processLink()
    }

    @Composable
    private fun InterceptActivityContent(status: InterceptResult) {
        Scaffold(
            topBar = { scrollBehavior ->
                AppBar(
                    title = stringResource(R.string.app_name),
                    navigateUp = ::onBackPressed,
                    scrollBehavior = scrollBehavior,
                )
            },
        ) {
            Column(
                modifier = Modifier
                    .fillMaxSize()
                    .padding(it),
                horizontalAlignment = Alignment.CenterHorizontally,
                verticalArrangement = Arrangement.spacedBy(8.dp, Alignment.CenterVertically),
            ) {
                when (status) {
                    InterceptResult.Idle, InterceptResult.Loading -> {
                        Text(
                            text = stringResource(R.string.loading_entry),
                            style = MaterialTheme.typography.titleLarge,
                        )
                        CircularProgressIndicator(modifier = Modifier.size(56.dp))
                    }
                    is InterceptResult.Success -> Text(
                        text = stringResource(R.string.launching_app),
                        style = MaterialTheme.typography.titleLarge,
                    )
                    is InterceptResult.Failure -> Text(
                        text = stringResource(R.string.error_with_reason, status.reason),
                        style = MaterialTheme.typography.titleLarge,
                    )
                }
            }
        }
    }

    private fun processLink() {
        if (Intent.ACTION_VIEW == intent.action) {
            loadGallery(intent.dataString!!)
        }
    }

    override fun onStart() {
        super.onStart()
        statusJob?.cancel()
        statusJob = status
            .onEach {
                when (it) {
                    is InterceptResult.Success -> {
                        onBackPressed()
                        startActivity(
                            if (it.chapter != null) {
                                ReaderActivity.newIntent(this, it.manga.id, it.chapter.id)
                            } else {
                                Intent(this, MainActivity::class.java)
                                    .setAction(Constants.SHORTCUT_MANGA)
                                    .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
                                    .putExtra(Constants.MANGA_EXTRA, it.mangaId)
                            },
                        )
                    }
                    is InterceptResult.Failure -> {
                        MaterialAlertDialogBuilder(this)
                            .setTitle(R.string.chapter_error)
                            .setMessage(getString(R.string.could_not_open_entry, it.reason))
                            .setPositiveButton(android.R.string.ok, null)
                            .setOnCancelListener { onBackPressed() }
                            .setOnDismissListener { onBackPressed() }
                            .show()
                    }
                    else -> Unit
                }
            }
            .launchIn(lifecycleScope)
    }

    override fun onStop() {
        super.onStop()
        statusJob?.cancel()
    }

    override fun finish() {
        super.finish()
        overridePendingTransition(R.anim.shared_axis_x_pop_enter, R.anim.shared_axis_x_pop_exit)
    }

    private val galleryAdder = GalleryAdder()

    @Synchronized
    fun loadGallery(gallery: String) {
        // Do not load gallery if already loading
        if (status.value is InterceptResult.Idle) {
            status.value = InterceptResult.Loading
            val sources = galleryAdder.pickSource(gallery)
            if (sources.size > 1) {
                MaterialAlertDialogBuilder(this)
                    .setTitle(R.string.label_sources)
                    .setSingleChoiceItems(sources.map { it.toString() }.toTypedArray(), 0) { dialog, index ->
                        dialog.dismiss()
                        loadGalleryEnd(gallery, sources[index])
                    }
                    .show()
            } else {
                loadGalleryEnd(gallery)
            }
        }
    }

    private fun loadGalleryEnd(gallery: String, source: UrlImportableSource? = null) {
        // Load gallery async
        lifecycleScope.launch(Dispatchers.IO) {
            val result = galleryAdder.addGallery(this@InterceptActivity, gallery, forceSource = source)

            status.value = when (result) {
                is GalleryAddEvent.Success -> InterceptResult.Success(result.manga.id, result.manga, result.chapter)
                is GalleryAddEvent.Fail -> InterceptResult.Failure(result.logMessage)
            }
        }
    }

    init {
        registerSecureActivity(this)
    }
}

sealed class InterceptResult {
    object Idle : InterceptResult()
    object Loading : InterceptResult()
    data class Success(val mangaId: Long, val manga: Manga, val chapter: Chapter? = null) : InterceptResult()
    data class Failure(val reason: String) : InterceptResult()
}