session-ios/SessionSnodeKit/Database/Migrations/_006_DropSnodeCache.swift

// Copyright © 2024 Rangeproof Pty Ltd. All rights reserved.

import Foundation
import GRDB
import SessionUtilitiesKit

/// This migration drops the current `SnodePool` and `SnodeSet` and their associated jobs as they are handled by `libSession` now
enum _006_DropSnodeCache: Migration {
    static let target: TargetMigrations.Identifier = .snodeKit
    static let identifier: String = "DropSnodeCache"
    static let minExpectedRunDuration: TimeInterval = 0.1
    static let createdTables: [(TableRecord & FetchableRecord).Type] = []
    
    static func migrate(_ db: Database, using dependencies: Dependencies) throws {
        try db.drop(table: "snode")
        try db.drop(table: "snodeSet")
        
        // Drop the old snode cache jobs as well
        let variantsToDelete: String = [
            Job.Variant._legacy_getSnodePool,
            Job.Variant._legacy_buildPaths,
            Job.Variant._legacy_getSwarm
        ].map { "\($0.rawValue)" }.joined(separator: ", ")
        try db.execute(sql: "DELETE FROM job WHERE variant IN (\(variantsToDelete))")
        
        Storage.update(progress: 1, for: self, in: target, using: dependencies)
    }
}