//
// SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
// SPDX-License-Identifier: GPL-3.0-or-later
//

import Foundation
import Realm

@objc extension NCRoom {

    public static func stringFor(notificationLevel level: NCRoomNotificationLevel) -> String {
        var levelString = ""

        switch level {
        case .always:
            levelString = NSLocalizedString("All messages", comment: "")
        case .mention:
            levelString = NSLocalizedString("@-mentions only", comment: "")
        case .never:
            levelString = NSLocalizedString("Off", comment: "")
        default:
            levelString = NSLocalizedString("Default", comment: "")
        }

        return levelString
    }

    public static func stringFor(messageExpiration expiration: NCMessageExpiration) -> String {
        var levelString = ""

        switch expiration {
        case .expiration4Weeks:
            levelString = NSLocalizedString("4 weeks", comment: "")
        case .expiration1Week:
            levelString = NSLocalizedString("1 week", comment: "")
        case .expiration1Day:
            levelString = NSLocalizedString("1 day", comment: "")
        case .expiration8Hours:
            levelString = NSLocalizedString("8 hours", comment: "")
        case .expiration1Hour:
            levelString = NSLocalizedString("1 hour", comment: "")
        default:
            levelString = NSLocalizedString("Off", comment: "")
        }

        return levelString
    }

    public var isPublic: Bool {
        return self.type == .public
    }

    public var isFederated: Bool {
        if let remoteToken, let remoteServer {
            return !remoteToken.isEmpty && !remoteServer.isEmpty
        }

        return false
    }

    public var supportsFederatedCalling: Bool {
        guard self.isFederated else { return false }

        let remoteCapabilitySupported = NCDatabaseManager.sharedInstance().roomHasTalkCapability(kCapabilityFederationV2, for: self)
        let localCapabilitySupported = NCDatabaseManager.sharedInstance().serverHasTalkCapability(kCapabilityFederationV2, forAccountId: self.accountId)

        let remoteCallingEnabled = NCDatabaseManager.sharedInstance().roomTalkCapabilities(for: self)?.callEnabled ?? false
        let localCallingEnabled = NCDatabaseManager.sharedInstance().serverCapabilities(forAccountId: self.accountId)?.callEnabled ?? false

        let capabilitySupported = remoteCapabilitySupported && localCapabilitySupported
        let callingEnabled = remoteCallingEnabled && localCallingEnabled

        return capabilitySupported && callingEnabled
    }

    public var supportsCalling: Bool {
        if self.isFederated, !self.supportsFederatedCalling {
            return false
        }

        return NCDatabaseManager.sharedInstance().roomTalkCapabilities(for: self)?.callEnabled ?? false &&
            self.type != .changelog && self.type != .noteToSelf
    }

    public var supportsMessageExpirationModeration: Bool {
        if self.type == .formerOneToOne || self.type == .changelog {
            return false
        }

        return self.isUserOwnerOrModerator && NCDatabaseManager.sharedInstance().serverHasTalkCapability(kCapabilityMessageExpiration)
    }

    public var supportsBanningModeration: Bool {
        let supportedType = self.type == .group || self.type == .public

        return supportedType && self.canModerate && NCDatabaseManager.sharedInstance().serverHasTalkCapability(kCapabilityBanV1)
    }

    public var isBreakoutRoom: Bool {
        return self.objectType == NCRoomObjectTypeRoom
    }

    public var isUserOwnerOrModerator: Bool {
        return self.participantType == .owner || self.participantType == .moderator
    }

    public var canModerate: Bool {
        return self.isUserOwnerOrModerator && !self.isLockedOneToOne
    }

    public var isNameEditable: Bool {
        return self.canModerate && self.type != .oneToOne && self.type != .formerOneToOne
    }

    private var isLockedOneToOne: Bool {
        let lockedOneToOne = self.type == .oneToOne && NCDatabaseManager.sharedInstance().serverHasTalkCapability(kCapabilityLockedOneToOneRooms)
        let lockedOther = self.type == .formerOneToOne || self.type == .noteToSelf

        return lockedOneToOne || lockedOther
    }

    public var isLeavable: Bool {
        // Allow users to leave when there are no moderators in the room
        // (No need to check room type because in one2one rooms users will always be moderators)
        // or when in a group call and there are other participants.
        // We can also check "canLeaveConversation" since v2

        if self.type != .oneToOne && self.type != .formerOneToOne && self.participants.count > 1 {
            return true
        }

        return self.canLeaveConversation || self.canModerate
    }

    public var userCanStartCall: Bool {
        if NCDatabaseManager.sharedInstance().serverHasTalkCapability(kCapabilityStartCallFlag) && !self.canStartCall {
            return false
        }

        return true
    }

    public var hasUnreadMention: Bool {
        if self.type == .oneToOne || self.type == .formerOneToOne {
            return self.unreadMessages > 0
        }

        return self.unreadMention || self.unreadMentionDirect
    }

    public var callRecordingIsInActiveState: Bool {
        if NCDatabaseManager.sharedInstance().serverHasTalkCapability(kCapabilityRecordingV1) {
            // Starting states and running states are considered active
            if self.callRecording != NCCallRecordingState.stopped.rawValue && self.callRecording != NCCallRecordingState.failed.rawValue {
                return true
            }
        }

        return false
    }

    public var deletionMessage: String {
        var message = NSLocalizedString("Do you really want to delete this conversation?", comment: "")

        if self.type == .oneToOne || self.type == .formerOneToOne {
            message = String(format: NSLocalizedString("If you delete the conversation, it will also be deleted for %@", comment: ""), self.displayName)
        } else if self.participants.count > 1 {
            message = NSLocalizedString("If you delete the conversation, it will also be deleted for all other participants.", comment: "")
        }

        return message
    }

    public var notificationLevelString: String {
        return NCRoom.stringFor(notificationLevel: self.notificationLevel)
    }

    public var messageExpirationString: String {
        if let tempMessageExpiration = NCMessageExpiration(rawValue: self.messageExpiration) {
            return NCRoom.stringFor(messageExpiration: tempMessageExpiration)
        }

        return "\(self.messageExpiration)s"
    }

    public var lastMessageString: NSMutableAttributedString? {
        var lastMessage = self.lastMessage

        if self.isFederated && lastMessage == nil {
            let lastMessageDictionary = self.lastMessageProxiedDictionary
            lastMessage = NCChatMessage(dictionary: lastMessageDictionary)
        }

        guard let lastMessage,
              let account = NCDatabaseManager.sharedInstance().talkAccount(forAccountId: self.accountId)
        else { return nil }

        let ownMessage = lastMessage.actorId == account.userId
        var actorName = lastMessage.actorDisplayName.components(separatedBy: " ").first ?? ""

        // For own messages
        if ownMessage {
            actorName = NSLocalizedString("You", comment: "")
        }

        // For guests
        if lastMessage.actorDisplayName.isEmpty {
            actorName = NSLocalizedString("Guest", comment: "")
        }

        // No actor name cases
        if lastMessage.isSystemMessage || (self.type == .oneToOne && !ownMessage) {
            actorName = ""
        }

        // Add separator
        if !actorName.isEmpty {
            actorName = "\(actorName): "
        }

        let lastMessageString = NSMutableAttributedString(string: actorName)

        if let messageIconName = lastMessage.messageIconName, let messageIcon = UIImage(systemName: messageIconName) {
            let attachmentString = NSMutableAttributedString(attachment: NSTextAttachment(image: messageIcon))
            attachmentString.append(NSAttributedString(string: " "))

            lastMessageString.append(attachmentString)
        }

        let parsedMarkdownString = String(lastMessage.parsedMarkdown().string.prefix(80))
        lastMessageString.append(NSAttributedString(string: parsedMarkdownString))

        return lastMessageString.withFont(.preferredFont(forTextStyle: .callout)).withTextColor(.secondaryLabel)
    }

    private var lastMessageProxiedDictionary: [AnyHashable: Any] {
        guard let data = self.lastMessageProxiedJSONString.data(using: .utf8),
              let jsonData = try? JSONSerialization.jsonObject(with: data) as? [AnyHashable: Any]
        else { return [:] }

        return jsonData
    }

    public var lastMessage: NCChatMessage? {
        guard let lastMessageId else { return nil }

        var unmanagedChatMessage: NCChatMessage?

        if let managedChatMessage = NCChatMessage.objects(where: "internalId = %@", lastMessageId).firstObject() {
            unmanagedChatMessage = NCChatMessage(value: managedChatMessage)
        }

        return unmanagedChatMessage
    }

    public var linkURL: String? {
        guard let account = NCDatabaseManager.sharedInstance().talkAccount(forAccountId: self.accountId),
              let serverCapabilities = NCDatabaseManager.sharedInstance().serverCapabilities(forAccountId: self.accountId),
              let token = self.token
        else { return nil }

        var indexString = "/index.php"

        if serverCapabilities.modRewriteWorking {
            indexString = ""
        }

        return "\(account.server)\(indexString)/call/\(token)"
    }

}