import Foundation
import GRDB

extension Database {
    static var migrator: DatabaseMigrator = {
        var migrator = DatabaseMigrator()

        // flush db on schema change (only in DEV mode)
        #if DEBUG
            migrator.eraseDatabaseOnSchemaChange = true
        #endif

        // 1st migration - basic tables
        migrator.registerMigration("Add basic tables") { db in
            // credentials
            try db.create(table: "credentials", options: [.ifNotExists]) { table in
                table.column("bareJid", .text).notNull().primaryKey().unique(onConflict: .replace)
                table.column("pass", .text).notNull()
                table.column("isActive", .boolean).notNull().defaults(to: true)
            }

            // rosters
            try db.create(table: "rosterVersions", options: [.ifNotExists]) { table in
                table.column("bareJid", .text).notNull().primaryKey().unique(onConflict: .replace)
                table.column("version", .text).notNull()
            }
            try db.create(table: "rosters", options: [.ifNotExists]) { table in
                table.column("bareJid", .text).notNull()
                table.column("contactBareJid", .text).notNull()
                table.column("name", .text)
                table.column("subscription", .text).notNull()
                table.column("ask", .boolean).notNull().defaults(to: false)
                table.column("data", .text).notNull()
                table.primaryKey(["bareJid", "contactBareJid"], onConflict: .replace)
                table.column("locallyDeleted", .boolean).notNull().defaults(to: false)
            }

            // chats
            try db.create(table: "chats", options: [.ifNotExists]) { table in
                table.column("id", .text).notNull().primaryKey().unique(onConflict: .replace)
                table.column("account", .text).notNull()
                table.column("participant", .text).notNull()
                table.column("type", .integer).notNull()
            }

            // messages
            try db.create(table: "messages", options: [.ifNotExists]) { table in
                table.column("id", .text).notNull().primaryKey().unique(onConflict: .replace)
                table.column("type", .text).notNull()
                table.column("date", .datetime).notNull()
                table.column("contentType", .text).notNull()
                table.column("status", .integer).notNull()
                table.column("from", .text).notNull()
                table.column("to", .text)
                table.column("body", .text)
                table.column("subject", .text)
                table.column("thread", .text)
                table.column("oobUrl", .text)
            }
        }

        migrator.registerMigration("Add OMEMO tables") { db in
            try db.create(table: "omemo_sessions", options: [.ifNotExists]) { table in
                table.column("account", .text).notNull()
                table.column("name", .text).notNull()
                table.column("deviceId", .integer).notNull()
                table.column("key", .text).notNull()
                table.primaryKey(["account", "name", "deviceId"], onConflict: .replace)
            }

            try db.create(table: "omemo_identities", options: [.ifNotExists]) { table in
                table.column("account", .text).notNull()
                table.column("name", .text).notNull()
                table.column("deviceId", .integer).notNull()
                table.column("fingerprint", .text).notNull()
                table.column("key", .blob).notNull()
                table.column("own", .integer).notNull()
                table.column("status", .integer).notNull()
                table.primaryKey(["account", "name", "fingerprint"], onConflict: .ignore)
            }

            try db.create(table: "omemo_pre_keys", options: [.ifNotExists]) { table in
                table.column("account", .text).notNull()
                table.column("id", .integer).notNull()
                table.column("key", .blob).notNull()
                table.column("markForDeletion", .boolean).notNull().defaults(to: false)
                table.primaryKey(["account", "id"], onConflict: .replace)
            }

            try db.create(table: "omemo_signed_pre_keys", options: [.ifNotExists]) { table in
                table.column("account", .text).notNull()
                table.column("id", .integer).notNull()
                table.column("key", .blob).notNull()
                table.primaryKey(["account", "id"], onConflict: .replace)
            }

            do {
                try db.alter(table: "messages") { table in
                    table.add(column: "secure", .boolean).notNull().defaults(to: false)
                }
            } catch {
                print("Error adding columns: \(error)\nProbably already added")
            }

            do {
                try db.alter(table: "chats") { table in
                    table.add(column: "encrypted", .boolean).notNull().defaults(to: false)
                }
            } catch {
                print("Error adding columns: \(error)\nProbably already added")
            }
        }

        // return migrator
        return migrator
    }()
}