// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.

import Foundation
import GRDB
import SessionUtil
import SessionUtilitiesKit

internal extension SessionUtil {
    static let columnsRelatedToUserProfile: [Profile.Columns] = [
        Profile.Columns.name,
        Profile.Columns.profilePictureUrl,
        Profile.Columns.profileEncryptionKey
    ]
    
    // MARK: - Incoming Changes
    
    static func handleUserProfileUpdate(
        _ db: Database,
        in conf: UnsafeMutablePointer<config_object>?,
        mergeNeedsDump: Bool,
        latestConfigUpdateSentTimestamp: TimeInterval
    ) throws {
        typealias ProfileData = (profileName: String, profilePictureUrl: String?, profilePictureKey: Data?)
        
        guard mergeNeedsDump else { return }
        guard conf != nil else { throw SessionUtilError.nilConfigObject }
        
        // A profile must have a name so if this is null then it's invalid and can be ignored
        guard let profileNamePtr: UnsafePointer<CChar> = user_profile_get_name(conf) else { return }
        
        let userPublicKey: String = getUserHexEncodedPublicKey(db)
        let profileName: String = String(cString: profileNamePtr)
        let profilePic: user_profile_pic = user_profile_get_pic(conf)
        let profilePictureUrl: String? = String(libSessionVal: profilePic.url, nullIfEmpty: true)
        
        // Handle user profile changes
        try ProfileManager.updateProfileIfNeeded(
            db,
            publicKey: userPublicKey,
            name: profileName,
            avatarUpdate: {
                guard let profilePictureUrl: String = profilePictureUrl else { return .remove }
                
                return .updateTo(
                    url: profilePictureUrl,
                    key: Data(
                        libSessionVal: profilePic.url,
                        count: ProfileManager.avatarAES256KeyByteLength
                    ),
                    fileName: nil
                )
            }(),
            sentTimestamp: latestConfigUpdateSentTimestamp,
            calledFromConfigHandling: true
        )
        
        // Create a contact for the current user if needed (also force-approve the current user
        // in case the account got into a weird state or restored directly from a migration)
        let userContact: Contact = Contact.fetchOrCreate(db, id: userPublicKey)
        
        if !userContact.isTrusted || !userContact.isApproved || !userContact.didApproveMe {
            try userContact.save(db)
            try Contact
                .filter(id: userPublicKey)
                .updateAll( // Handling a config update so don't use `updateAllAndConfig`
                    db,
                    Contact.Columns.isTrusted.set(to: true),    // Always trust the current user
                    Contact.Columns.isApproved.set(to: true),
                    Contact.Columns.didApproveMe.set(to: true)
                )
        }
    }
    
    // MARK: - Outgoing Changes
    
    static func update(
        profile: Profile,
        in conf: UnsafeMutablePointer<config_object>?
    ) throws -> ConfResult {
        guard conf != nil else { throw SessionUtilError.nilConfigObject }
        
        // Update the name
        var updatedName: [CChar] = profile.name.cArray
        user_profile_set_name(conf, &updatedName)
        
        // Either assign the updated profile pic, or sent a blank profile pic (to remove the current one)
        var profilePic: user_profile_pic = user_profile_pic()
        profilePic.url = profile.profilePictureUrl.toLibSession()
        profilePic.key = profile.profileEncryptionKey.toLibSession()
        user_profile_set_pic(conf, profilePic)
        
        return ConfResult(
            needsPush: config_needs_push(conf),
            needsDump: config_needs_dump(conf)
        )
    }
    
    static func updateNoteToSelfPriority(
        _ db: Database,
        priority: Int32,
        in atomicConf: Atomic<UnsafeMutablePointer<config_object>?>
    ) throws {
        guard atomicConf.wrappedValue != nil else { throw SessionUtilError.nilConfigObject }
        
        let userPublicKey: String = getUserHexEncodedPublicKey(db)
        
        // Since we are doing direct memory manipulation we are using an `Atomic` type which has
        // blocking access in it's `mutate` closure
        try atomicConf.mutate { conf in
            user_profile_set_nts_priority(conf, priority)
            
            // If we don't need to dump the data the we can finish early
            guard config_needs_dump(conf) else { return }
            
            try SessionUtil.createDump(
                conf: conf,
                for: .userProfile,
                publicKey: userPublicKey
            )?.save(db)
        }
    }
}