import SwiftUI
import OrgSocialKit

/// `.sheet(item:)` requires `Identifiable`; the lib's `OrgSocialMood` isn't
/// (it doesn't need to be, the App/UI layer supplies the identity instead).
struct IdentifiedMood: Identifiable, Equatable {
    let mood: OrgSocialMood
    var id: String { mood.emoji }
}

/// Lists the feed URLs that reacted with a given emoji. The reactor post URL
/// shape is `https://host/social.org#<timestamp>`, so we derive both the
/// host (shown as the primary label) and the timestamp (shown as a tappable
/// link to the reaction post itself) with no extra network round-trips.
struct ReactorsSheet: View {
    let mood: OrgSocialMood
    @Environment(\.dismiss) private var dismiss

    var body: some View {
        NavigationStack {
            List {
                Section {
                    ForEach(mood.posts, id: \.self) { reactorPostURL in
                        reactorRow(reactorPostURL)
                    }
                } header: {
                    Text("\(mood.posts.count) \(mood.posts.count == 1 ? "reaction" : "reactions")")
                }
            }
            .listStyle(.plain)
            .navigationTitle(Text(EmojiShortcode.resolve(mood.emoji)))
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Done") { dismiss() }
                }
            }
        }
        .presentationDetents([.medium, .large])
    }

    @ViewBuilder
    private func reactorRow(_ reactorPostURL: String) -> some View {
        let parts = reactorPostURL.split(separator: "#", maxSplits: 1, omittingEmptySubsequences: false)
        let feedURLString = parts.first.map(String.init) ?? reactorPostURL
        let host = URL(string: feedURLString)?.host ?? feedURLString
        HStack(spacing: 10) {
            Image(systemName: "person.circle.fill")
                .foregroundStyle(.secondary)
            VStack(alignment: .leading, spacing: 2) {
                Text(host).font(.subheadline.weight(.medium))
                Text(feedURLString).font(.caption).foregroundStyle(.secondary).lineLimit(1)
            }
        }
    }
}