import Foundation
import Postbox
import SwiftSignalKit


func _internal_addStickerPackInteractively(postbox: Postbox, info: StickerPackCollectionInfo, items: [StickerPackItem], positionInList: Int? = nil) -> Signal<Void, NoError> {
    return postbox.transaction { transaction -> Void in
        let namespace: SynchronizeInstalledStickerPacksOperationNamespace?
        switch info.id.namespace {
            case Namespaces.ItemCollection.CloudStickerPacks:
                namespace = .stickers
            case Namespaces.ItemCollection.CloudMaskPacks:
                namespace = .masks
            case Namespaces.ItemCollection.CloudEmojiPacks:
                namespace = .emoji
            default:
                namespace = nil
        }
        if let namespace = namespace {
            var mappedInfo = info
            if items.isEmpty {
                mappedInfo = StickerPackCollectionInfo(id: info.id, flags: info.flags, accessHash: info.accessHash, title: info.title, shortName: info.shortName, thumbnail: info.thumbnail, thumbnailFileId: info.thumbnailFileId, immediateThumbnailData: info.immediateThumbnailData, hash: Int32(bitPattern: arc4random()), count: info.count)
            }
            addSynchronizeInstalledStickerPacksOperation(transaction: transaction, namespace: namespace, content: .add([mappedInfo.id]), noDelay: items.isEmpty)
            var updatedInfos = transaction.getItemCollectionsInfos(namespace: mappedInfo.id.namespace).map { $0.1 as! StickerPackCollectionInfo }
            if let index = updatedInfos.firstIndex(where: { $0.id == mappedInfo.id }) {
                let currentInfo = updatedInfos[index]
                updatedInfos.remove(at: index)
                updatedInfos.insert(currentInfo, at: 0)
            } else {
                if let positionInList = positionInList, positionInList <= updatedInfos.count {
                    updatedInfos.insert(mappedInfo, at: positionInList)
                } else {
                    updatedInfos.insert(mappedInfo, at: 0)
                }
                
                var indexedItems: [ItemCollectionItem] = []
                for item in items {
                    indexedItems.append(StickerPackItem(index: ItemCollectionItemIndex(index: Int32(indexedItems.count), id: item.index.id), file: item.file, indexKeys: item.indexKeys))
                }
                transaction.replaceItemCollectionItems(collectionId: mappedInfo.id, items: indexedItems)
            }
            transaction.replaceItemCollectionInfos(namespace: mappedInfo.id.namespace, itemCollectionInfos: updatedInfos.map { ($0.id, $0) })
        }
    }
}

public enum RemoveStickerPackOption {
    case delete
    case archive
}

func _internal_removeStickerPackInteractively(postbox: Postbox, id: ItemCollectionId, option: RemoveStickerPackOption) -> Signal<(Int, [ItemCollectionItem])?, NoError> {
    return _internal_removeStickerPacksInteractively(postbox: postbox, ids: [id], option: option)
}

func _internal_removeStickerPacksInteractively(postbox: Postbox, ids: [ItemCollectionId], option: RemoveStickerPackOption) -> Signal<(Int, [ItemCollectionItem])?, NoError> {
    return postbox.transaction { transaction -> (Int, [ItemCollectionItem])? in
        var commonNamespace: SynchronizeInstalledStickerPacksOperationNamespace?
        for id in ids { 
            let namespace: SynchronizeInstalledStickerPacksOperationNamespace?
            switch id.namespace {
                case Namespaces.ItemCollection.CloudStickerPacks:
                    namespace = .stickers
                case Namespaces.ItemCollection.CloudMaskPacks:
                    namespace = .masks
                case Namespaces.ItemCollection.CloudEmojiPacks:
                    namespace = .emoji
                default:
                    namespace = nil
            }
            if commonNamespace == nil && namespace != nil {
                commonNamespace = namespace
            } else if commonNamespace != namespace {
                fatalError()
            }
        }
        if let namespace = commonNamespace {
            let content: AddSynchronizeInstalledStickerPacksOperationContent
            switch option {
                case .delete:
                    content = .remove(ids)
                case .archive:
                    content = .archive(ids)
            }
            if let id = ids.first {
                let index = transaction.getItemCollectionsInfos(namespace: id.namespace).firstIndex(where: { $0.0 == id })
                let items = transaction.getItemCollectionItems(collectionId: id)
                
                addSynchronizeInstalledStickerPacksOperation(transaction: transaction, namespace: namespace, content: content, noDelay: false)
                for id in ids {
                    transaction.removeItemCollection(collectionId: id)
                }
                return index.flatMap { ($0, items) }
            } else {
                return nil
            }
        } else {
            return nil
        }
    }
}

func _internal_markFeaturedStickerPacksAsSeenInteractively(postbox: Postbox, ids: [ItemCollectionId]) -> Signal<Void, NoError> {
    return postbox.transaction { transaction -> Void in
        let idsSet = Set(ids)
        var items = transaction.getOrderedListItems(collectionId: Namespaces.OrderedItemList.CloudFeaturedStickerPacks)
        var readIds = Set<ItemCollectionId>()
        for i in 0 ..< items.count {
            let item = items[i].contents.get(FeaturedStickerPackItem.self)!
            if item.unread && idsSet.contains(item.info.id) {
                readIds.insert(item.info.id)
                if let entry = CodableEntry(FeaturedStickerPackItem(info: item.info, topItems: item.topItems, unread: false)) {
                    items[i] = OrderedItemListEntry(id: items[i].id, contents: entry)
                }
            }
        }
        if !readIds.isEmpty {
            transaction.replaceOrderedItemListItems(collectionId: Namespaces.OrderedItemList.CloudFeaturedStickerPacks, items: items)
            addSynchronizeMarkFeaturedStickerPacksAsSeenOperation(transaction: transaction, ids: Array(readIds))
        }
    }
}