import Foundation
import GRDB
import Martin

final class ClientMartinRosterManager: Martin.RosterManager {
    func clear(for context: Martin.Context) {
        do {
            try Database.shared.dbQueue.write { db in
                try Roster
                    .filter(Column("bareJid") == context.userBareJid.stringValue)
                    .deleteAll(db)

                try RosterVersion
                    .filter(Column("bareJid") == context.userBareJid.stringValue)
                    .deleteAll(db)
            }
        } catch {
            logIt(.error, "Error clearing roster: \(error.localizedDescription)")
        }
    }

    func items(for context: Martin.Context) -> [any Martin.RosterItemProtocol] {
        do {
            let rosters: [Roster] = try Database.shared.dbQueue.read { db in
                try Roster.filter(Column("bareJid") == context.userBareJid.stringValue).fetchAll(db)
            }
            return rosters.map { roster in
                RosterItemBase(
                    jid: JID(roster.bareJid),
                    name: roster.name,
                    subscription: RosterItemSubscription(rawValue: roster.subscription) ?? .none,
                    groups: roster.data.groups,
                    ask: roster.ask,
                    annotations: roster.data.annotations
                )
            }
        } catch {
            logIt(.error, "Error fetching roster items: \(error.localizedDescription)")
            return []
        }
    }

    func item(for context: Martin.Context, jid: Martin.JID) -> (any Martin.RosterItemProtocol)? {
        do {
            let roster: Roster? = try Database.shared.dbQueue.read { db in
                try Roster
                    .filter(Column("bareJid") == context.userBareJid.stringValue)
                    .filter(Column("contactBareJid") == jid.stringValue)
                    .fetchOne(db)
            }
            if let roster {
                return RosterItemBase(
                    jid: JID(roster.bareJid),
                    name: roster.name,
                    subscription: RosterItemSubscription(rawValue: roster.subscription) ?? .none,
                    groups: roster.data.groups,
                    ask: roster.ask,
                    annotations: roster.data.annotations
                )
            } else {
                return nil
            }
        } catch {
            logIt(.error, "Error fetching roster item: \(error.localizedDescription)")
            return nil
        }
    }

    func updateItem(for context: Martin.Context, jid: Martin.JID, name: String?, subscription: Martin.RosterItemSubscription, groups: [String], ask: Bool, annotations: [Martin.RosterItemAnnotation]) -> (any Martin.RosterItemProtocol)? {
        do {
            let roster = Roster(
                bareJid: context.userBareJid.stringValue,
                contactBareJid: jid.stringValue,
                name: name,
                subscription: subscription.rawValue,
                ask: ask,
                data: DBRosterData(
                    groups: groups,
                    annotations: annotations
                )
            )
            try Database.shared.dbQueue.write { db in
                try roster.save(db)
            }
            return RosterItemBase(jid: jid, name: name, subscription: subscription, groups: groups, ask: ask, annotations: annotations)
        } catch {
            logIt(.error, "Error updating roster item: \(error.localizedDescription)")
            return nil
        }
    }

    func deleteItem(for context: Martin.Context, jid: Martin.JID) -> (any Martin.RosterItemProtocol)? {
        do {
            let roster: Roster? = try Database.shared.dbQueue.read { db in
                try Roster
                    .filter(Column("bareJid") == context.userBareJid.stringValue)
                    .filter(Column("contactBareJid") == jid.stringValue)
                    .fetchOne(db)
            }
            if let roster {
                _ = try Database.shared.dbQueue.write { db in
                    try roster.delete(db)
                }
                return RosterItemBase(
                    jid: JID(roster.bareJid),
                    name: roster.name,
                    subscription: RosterItemSubscription(rawValue: roster.subscription) ?? .none,
                    groups: roster.data.groups,
                    ask: roster.ask,
                    annotations: roster.data.annotations
                )
            } else {
                return nil
            }
        } catch {
            logIt(.error, "Error fetching roster version: \(error.localizedDescription)")
            return nil
        }
    }

    func version(for context: Martin.Context) -> String? {
        do {
            let version: RosterVersion? = try Database.shared.dbQueue.read { db in
                try RosterVersion
                    .filter(Column("bareJid") == context.userBareJid.stringValue)
                    .fetchOne(db)
            }
            return version?.version
        } catch {
            logIt(.error, "Error fetching roster version: \(error.localizedDescription)")
            return nil
        }
    }

    func set(version: String?, for context: Martin.Context) {
        guard let version else { return }
        do {
            try Database.shared.dbQueue.write { db in
                let rosterVersion = RosterVersion(
                    bareJid: context.userBareJid.stringValue,
                    version: version
                )
                try rosterVersion.save(db)
            }
        } catch {
            logIt(.error, "Error setting roster version: \(error.localizedDescription)")
        }
    }

    func initialize(context _: Martin.Context) {}
    func deinitialize(context _: Martin.Context) {}
}