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package de.ircmail

import jakarta.mail.*
import jakarta.mail.event.MessageCountEvent
import jakarta.mail.event.MessageCountListener
import jakarta.mail.internet.InternetAddress
import jakarta.mail.internet.MimeMessage
import kotlinx.coroutines.*
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.delay
import kotlinx.coroutines.isActive
import kotlinx.coroutines.launch
import org.eclipse.angus.mail.imap.IMAPStore
import org.pircbotx.Configuration
import org.pircbotx.PircBotX
import org.pircbotx.hooks.ListenerAdapter
import org.pircbotx.hooks.events.ConnectEvent
import org.pircbotx.hooks.events.MessageEvent
import org.pircbotx.hooks.events.PrivateMessageEvent
import org.slf4j.LoggerFactory
import java.text.SimpleDateFormat
import java.util.*

// Configuration data classes
data class IrcConfig(
    val server: String,
    val port: Int = 6667,
    val ssl: Boolean = false,
    val nickname: String,
    val username: String,
    val realname: String,
    val password: String? = null,
    val channels: List<String> = emptyList()
)

data class ImapConfig(
    val host: String,
    val port: Int = 993,
    val ssl: Boolean = true,
    val username: String,
    val password: String,
    val folder: String = "INBOX"
)

data class SmtpConfig(
    val host: String,
    val port: Int = 587,
    val ssl: Boolean = true,
    val username: String,
    val password: String
)

data class BotConfig(
    val irc: IrcConfig,
    val imap: ImapConfig,
    val smtp: SmtpConfig,
    val database: String = "./ircmail.db",
    val channelPrefix: String = "#contact-"
)

// Contact management
data class Contact(
    val emailAddress: String,
    val channelName: String,
    val displayName: String,
    val latestMessageId: String? = null
)

class ContactManager(private val channelPrefix: String) {
    private val logger = LoggerFactory.getLogger(ContactManager::class.java)

    fun extractContactFromEmail(message: Message): Contact? {
        return try {
            val fromAddresses = message.from
            if (fromAddresses.isNullOrEmpty()) {
                logger.warn("Email has no From address")
                return null
            }

            val fromAddress = fromAddresses[0] as InternetAddress
            val emailAddress = fromAddress.address
            val displayName = fromAddress.personal ?: extractNameFromEmail(emailAddress)

            Contact(
                emailAddress = emailAddress,
                channelName = sanitizeEmailToChannelName(emailAddress),
                displayName = displayName,
                latestMessageId = getMessageId(message)
            )
        } catch (e: Exception) {
            logger.error("Failed to extract contact from email", e)
            null
        }
    }

    private fun sanitizeEmailToChannelName(emailAddress: String): String {
        val sanitized = emailAddress
            .lowercase()
            .replace("@", "-")
            .replace(".", "-")
            .replace("[^a-z0-9-]".toRegex(), "")
            .take(50)

        return "$channelPrefix$sanitized"
    }

    private fun extractNameFromEmail(emailAddress: String): String {
        return emailAddress.substringBefore("@")
            .replace(".", " ")
            .split(" ")
            .joinToString(" ") { it.replaceFirstChar { char -> char.uppercase() } }
    }

    private fun getMessageId(message: Message): String? {
        return try {
            message.getHeader("Message-ID")?.firstOrNull()
        } catch (e: Exception) {
            logger.warn("Could not extract Message-ID from email", e)
            null
        }
    }

    fun getContactIdentifierFromChannel(channelName: String): String? {
        return if (channelName.startsWith(channelPrefix)) {
            channelName.removePrefix(channelPrefix)
        } else {
            null
        }
    }
}

// SMTP client for sending replies
class SmtpClient(private val config: SmtpConfig) {
    private val logger = LoggerFactory.getLogger(SmtpClient::class.java)

    private val session: Session by lazy {
        val props = Properties().apply {
            if (config.ssl) {
                put("mail.smtp.host", config.host)
                put("mail.smtp.port", config.port.toString())
                put("mail.smtp.auth", "true")
                put("mail.smtp.starttls.enable", "true")
                put("mail.smtp.ssl.protocols", "TLSv1.2")
            } else {
                put("mail.smtp.host", config.host)
                put("mail.smtp.port", config.port.toString())
                put("mail.smtp.auth", "false")
            }
        }

        if (config.ssl) {
            Session.getInstance(props, object : Authenticator() {
                override fun getPasswordAuthentication(): PasswordAuthentication {
                    return PasswordAuthentication(config.username, config.password)
                }
            })
        } else {
            Session.getInstance(props)
        }
    }

    suspend fun sendReply(
        toEmail: String,
        subject: String,
        body: String,
        inReplyTo: String? = null,
        references: String? = null
    ) {
        try {
            val message = MimeMessage(session).apply {
                setFrom(InternetAddress(config.username))
                setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail))
                setSubject(if (subject.startsWith("Re:")) subject else "Re: $subject")
                setText(body)

                inReplyTo?.let { setHeader("In-Reply-To", it) }
                references?.let { setHeader("References", it) }
            }

            Transport.send(message)
            logger.info("Sent email reply to $toEmail with subject: $subject")

        } catch (e: MessagingException) {
            logger.error("Failed to send email to $toEmail", e)
            throw e
        }
    }
}

// IMAP client for monitoring emails
class ImapClient(
    private val config: ImapConfig,
    private val onNewEmail: suspend (Message) -> Unit
) {
    private val logger = LoggerFactory.getLogger(ImapClient::class.java)
    private lateinit var store: IMAPStore
    private lateinit var folder: Folder

    /** Job that polls the folder every few seconds for new messages.
     * without this, the new message event will never get called.
     */
    private lateinit var pollingJob: Job

    suspend fun start() = withContext(Dispatchers.IO) {
        logger.info("Connecting to IMAP server: ${config.host}:${config.port}")

        val props = Properties().apply {
            if (config.ssl) {
                put("mail.store.protocol", "imaps")
                put("mail.imaps.host", config.host)
                put("mail.imaps.port", config.port.toString())
                put("mail.imaps.ssl.enable", "true")
                put("mail.imaps.ssl.protocols", "TLSv1.2")
            } else {
                put("mail.store.protocol", "imap")
                put("mail.imap.host", config.host)
                put("mail.imap.port", config.port.toString())
                put("mail.imap.ssl.enable", "false")
            }
        }


        val session = Session.getInstance(props)
        val protocol = if (config.ssl) "imaps" else "imap"
        store = session.getStore(protocol).apply {
            connect(config.host, config.username, config.password)

        } as IMAPStore
        folder = store.getFolder(config.folder).apply {
            open(Folder.READ_ONLY)
        }

        folder.addMessageCountListener(object : MessageCountListener {
            override fun messagesAdded(event: MessageCountEvent) {
                event.messages.forEach { message ->
                    runBlocking {
                        try {
                            onNewEmail(message)
                        } catch (e: Exception) {
                            logger.error("Error processing new email", e)
                        }
                    }
                }
            }

            override fun messagesRemoved(event: MessageCountEvent) {}
        })


        pollingJob = CoroutineScope(Dispatchers.IO).launch {
            while (isActive) {
                try {
                    folder.let { folder ->
                        if (folder.isOpen) {
                            logger.debug("Polling for new emails...")
                            delay(5000)
                            // the message count will fire the event we are actually listening for
                            folder.newMessageCount
                        }
                    }
                } catch (e: Exception) {
                    logger.error("Email monitoring failed, retrying in 30 seconds", e)
                    delay(30000)
                }
            }
        }
        logger.info("IMAP client started and monitoring ${config.folder}")
    }

    fun stop() {
        pollingJob.cancel()
        folder.close(false)
        store.close()
        logger.info("IMAP client stopped")
    }
}

// Email processing and formatting
class EmailProcessor(
    private val contactManager: ContactManager,
    private val ircBot: EmailIrcBot
) {
    private val logger = LoggerFactory.getLogger(EmailProcessor::class.java)
    private val dateFormat = SimpleDateFormat("MMM dd HH:mm")

    suspend fun processNewEmail(message: Message) {
        try {
            val contact = contactManager.extractContactFromEmail(message)
            if (contact == null) {
                logger.warn("Could not extract contact from email")
                return
            }

            logger.info("Processing email from ${contact.emailAddress} to channel ${contact.channelName}")

            ircBot.joinChannel(contact.channelName)
            val formattedMessage = formatEmailForIrc(message, contact)
            ircBot.sendMessage(contact.channelName, formattedMessage)

        } catch (e: Exception) {
            logger.error("Failed to process email", e)
        }
    }

    private fun formatEmailForIrc(message: Message, contact: Contact): String {
        val subject = message.subject ?: "(No Subject)"
        val date = message.sentDate?.let { dateFormat.format(it) } ?: "Unknown"

        val body = try {
            when {
                message.isMimeType("text/plain") -> {
                    message.content as? String ?: "(Could not read content)"
                }

                message.isMimeType("text/html") -> {
                    "(HTML email - content not displayed)"
                }

                message.isMimeType("multipart/*") -> {
                    "(Multipart email - content not displayed)"
                }

                else -> "(Unsupported email format)"
            }
        } catch (e: Exception) {
            logger.warn("Could not extract email body", e)
            "(Could not read email content)"
        }

        val preview = body.take(300).replace("\n", " ")
        return "📧 From: ${contact.displayName} | $date | $subject | $preview"
    }
}

// Email reply handler
class EmailReplyHandler(
    private val config: BotConfig,
    private val smtpClient: SmtpClient,
    private val contactStorage: ContactStorage
) {
    private val logger = LoggerFactory.getLogger(EmailReplyHandler::class.java)

    suspend fun handleReply(contactIdentifier: String, message: String, fromNick: String) {
        logger.info("Processing reply from $fromNick to contact $contactIdentifier: $message")

        try {
            val contact = contactStorage.getContactByChannelIdentifier(contactIdentifier)
            if (contact == null) {
                logger.warn("No contact found for identifier: $contactIdentifier")
                return
            }

            val latestEmail = contactStorage.getLatestEmailForContact(contact.emailAddress)
            if (latestEmail == null) {
                logger.warn("No email history found for contact: ${contact.emailAddress}")
                return
            }

            val replySubject = if (latestEmail.subject.startsWith("Re:")) {
                latestEmail.subject
            } else {
                "Re: ${latestEmail.subject}"
            }

            val replyBody = buildString {
                appendLine("From IRC user: $fromNick")
                appendLine()
                appendLine(message)
            }

            smtpClient.sendReply(
                toEmail = contact.emailAddress,
                subject = replySubject,
                body = replyBody,
                inReplyTo = latestEmail.messageId,
                references = latestEmail.threadId
            )

            logger.info("Sent email reply to ${contact.emailAddress}")

        } catch (e: Exception) {
            logger.error("Failed to send reply to contact $contactIdentifier", e)
        }
    }
}

// Main IRC bot class
class EmailIrcBot(
    private val config: BotConfig,
    private val emailReplyHandler: EmailReplyHandler
) : ListenerAdapter() {

    private val logger = LoggerFactory.getLogger(EmailIrcBot::class.java)
    private lateinit var bot: PircBotX

    fun start() {
        val ircConfig = Configuration.Builder()
            .setName(config.irc.nickname)
            .setLogin(config.irc.username)
            .setRealName(config.irc.realname)
            .addServer(config.irc.server, config.irc.port)
            .apply {
                if (config.irc.ssl) {
                    addServer(config.irc.server, config.irc.port)
                }
                config.irc.password?.let { setServerPassword(it) }
                config.irc.channels.forEach { addAutoJoinChannel(it) }
            }
            .addListener(this)
            .buildConfiguration()

        bot = PircBotX(ircConfig)
        logger.info("Starting IRC bot...")
        bot.startBot()
    }

    fun stop() {
        if (::bot.isInitialized) {
            bot.stopBotReconnect()
            bot.close()
        }
    }

    override fun onConnect(event: ConnectEvent) {
        logger.info("Connected to IRC server")
    }

    override fun onMessage(event: MessageEvent) {
        val channelName = event.channel.name

        if (channelName.startsWith(config.channelPrefix)) {
            val contactIdentifier = channelName.removePrefix(config.channelPrefix)
            logger.info("Received message in contact channel $channelName from ${event.user?.nick}: ${event.message}")

            // Handle as email reply (TODO: make this async)
            // emailReplyHandler.handleReply(contactIdentifier, event.message, event.user?.nick ?: "unknown")
        }
    }

    override fun onPrivateMessage(event: PrivateMessageEvent) {
        logger.info("Received private message from ${event.user?.nick}: ${event.message}")
    }

    fun joinChannel(channelName: String) {
        if (::bot.isInitialized) {
            bot.send().joinChannel(channelName)
            logger.info("Joined channel: $channelName")
        }
    }

    fun sendMessage(channelName: String, message: String) {
        if (::bot.isInitialized) {
            val channel = bot.userChannelDao.getChannel(channelName)
            if (channel != null) {
                bot.send().message(channelName, message)
                logger.debug("Sent message to $channelName: $message")
            } else {
                logger.warn("Channel $channelName not found or not joined")
            }
        }
    }
}