import LChatCore
import SwiftUI

// One chat row's content — extracted so the UIKit list (ThreadListCollection) can
// render it inside a UICollectionViewListCell via UIHostingConfiguration. Pure
// presentation; the cell owns the highlight/selection chrome.
struct ThreadRow: View {
    let thread: ChatThread

    var body: some View {
        HStack(spacing: 12) {
            // The main list finally shows app identity: Eleven's own threads
            // wear the brand tile, apps their mark (docs/icons.md), and the
            // emoji glyph stays the fallback for anything unmapped.
            Avatar(name: thread.title, size: 44, source: thread.avatar,
                   photo: thread.isEleven ? ElevenBrand.icon : nil,
                   glyph: thread.glyph,
                   symbol: AppIdentity.symbol(for: thread.appId),
                   mark: AppIdentity.mark(for: thread.appId))
            VStack(alignment: .leading, spacing: 2) {
                HStack {
                    Text(thread.title).font(.headline).lineLimit(1)
                    if let badge = thread.badge {
                        AgentBadge(badge)
                    }
                    Spacer()
                    HStack(spacing: 4) {
                        if thread.pinned {
                            Image(systemName: "pin.fill")
                                .font(.caption2)
                                .foregroundStyle(.secondary)
                                .accessibilityLabel("Pinned")
                        }
                        if thread.lastAt > 0 {
                            Text(relTime(thread.lastAt)).font(.caption).foregroundStyle(.secondary)
                        }
                    }
                }
                // Always rendered, preview or not: two reserved lines keep
                // every row the same height (à la Mail/Messages — a list of
                // mixed heights read as jumbled next to app rows with no
                // recent message). The web keeps its 2-line clamp.
                HStack(spacing: 6) {
                    Text(thread.preview)
                        .font(.subheadline).foregroundStyle(.secondary)
                        .lineLimit(2, reservesSpace: true)
                    Spacer()
                    // A muted chat never escalates: the slashed bell replaces
                    // the unread dot — the state stays visible (never absence
                    // alone), it just doesn't shout. Web-list parity.
                    if thread.isMuted {
                        Image(systemName: "bell.slash.fill")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                            .accessibilityLabel("Muted")
                    } else if thread.unread {
                        Circle().fill(Color.accentColor).frame(width: 9, height: 9)
                    }
                }
            }
        }
    }
}

// relTime moved to LChatCore (Format) — the Mac thread list uses it too.