import Foundation

@MainActor
struct PostingManager {

    static func post(
        text: String,
        images: [ImageAttachment],
        accounts: [Account],
        accountStore: AccountStore
    ) async -> [(Account, Result<URL, Error>)] {
        var results: [(Account, Result<URL, Error>)] = []

        for account in accounts {
            guard let token = accountStore.token(for: account) else {
                results.append((account, .failure(PostingError(message: "No token for \(account.displayName)"))))
                continue
            }

            do {
                let url = try await postToAccount(account: account, token: token, text: text, images: images)
                results.append((account, .success(url)))
            } catch {
                results.append((account, .failure(error)))
            }
        }

        return results
    }

    private static func postToAccount(
        account: Account, token: String, text: String, images: [ImageAttachment]
    ) async throws -> URL {
        let imageData = images.map { (data: $0.data, filename: $0.filename) }

        switch account.serviceType {
        case .mastodon:
            let client = MastodonClient(account: account, token: token)
            var mediaIDs: [String] = []
            for img in imageData {
                let id = try await client.uploadMedia(imageData: img.data, filename: img.filename, altText: nil)
                mediaIDs.append(id)
            }
            return try await client.createPost(text: text, mediaIDs: mediaIDs)

        case .wordpress:
            let client = WordPressClient(account: account, token: token)
            var mediaIDs: [String] = []
            for img in imageData {
                let id = try await client.uploadMedia(imageData: img.data, filename: img.filename, altText: nil)
                mediaIDs.append(id)
            }
            return try await client.createPost(text: text, mediaIDs: mediaIDs)

        case .microblog:
            let client = MicroblogClient(account: account, token: token)
            var mediaIDs: [String] = []
            for img in imageData {
                let id = try await client.uploadMedia(imageData: img.data, filename: img.filename, altText: nil)
                mediaIDs.append(id)
            }
            return try await client.createPost(text: text, mediaIDs: mediaIDs)
        }
    }
}