// StoryRowView.swift
// Jarvis — one row in the signal feed. Everything fades with the signal score.

import SwiftUI

struct StoryRowView: View {
    let story: StorySummary
    /// True when the story's articles are cached in SwiftData (offline-ready).
    var isCached: Bool = false
    /// True once the story has been opened — drops the orange stripe and dims it.
    var isRead: Bool = false
    /// Slim single-line presentation, used for the "Read" shelf.
    var compact: Bool = false

    private var sourceNames: [String] { story.sources.map(\.name) }

    var body: some View {
        if compact { compactBody } else { fullBody }
    }

    private var compactBody: some View {
        HStack(spacing: 0) {
            SignalStripe(score: story.signalScore, muted: true)
            Text(story.headline)
                .font(.system(size: 14, weight: .bold))
                .foregroundStyle(Color(hex: "6A6A6A"))
                .lineLimit(1)
                .padding(.leading, 14)
                .padding(.vertical, 11)
            Spacer(minLength: 12)
            Text("\(story.signalScore)")
                .font(.system(size: 14, weight: .heavy, design: .monospaced))
                .foregroundStyle(Color(hex: "474747"))
                .padding(.trailing, 16)
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(Color.black)
        .overlay(alignment: .bottom) { Rectangle().fill(Palette.hairline).frame(height: 0.5) }
        .contentShape(Rectangle())
    }

    private var fullBody: some View {
        HStack(alignment: .top, spacing: 0) {
            SignalStripe(score: story.signalScore, muted: isRead)

            VStack(alignment: .leading, spacing: 9) {
                // Title (+ cached dot)
                HStack(alignment: .top, spacing: 8) {
                    Text(story.headline)
                        .font(.system(size: 17, weight: .heavy))
                        .foregroundStyle(Signal.titleColor(story.signalScore))
                        .lineLimit(3)
                        .fixedSize(horizontal: false, vertical: true)

                    if isCached {
                        CachedDot()
                            .padding(.top, 6)
                    }
                }

                // Summary preview — the gist, without opening the story.
                if !story.summary.isEmpty {
                    Text(story.summary)
                        .font(.system(size: 13, weight: .regular))
                        .foregroundStyle(Color(hex: "8A8A8A"))
                        .lineLimit(6)
                        .lineSpacing(2)
                        .fixedSize(horizontal: false, vertical: true)
                }

                // Source chips
                if !sourceNames.isEmpty {
                    SourceChips(names: sourceNames, total: story.sourceCount)
                }

                // Metadata
                Text(metaLine)
                    .font(.system(size: 11, weight: .regular, design: .monospaced))
                    .foregroundStyle(Color(hex: "666666"))
            }
            .padding(.leading, 14)
            .padding(.vertical, 16)

            Spacer(minLength: 12)

            // Signal score column
            Text("\(story.signalScore)")
                .font(.system(size: 22, weight: .heavy, design: .monospaced))
                .foregroundStyle(Signal.scoreColor(story.signalScore))
                .padding(.trailing, 16)
                .padding(.top, 16)
        }
        .opacity(isRead ? 0.55 : 1)
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(Color.black)
        .overlay(alignment: .bottom) {
            Rectangle().fill(Palette.hairline).frame(height: 0.5)
        }
        .contentShape(Rectangle())
    }

    private var metaLine: String {
        let sources = "\(story.sourceCount) source\(story.sourceCount == 1 ? "" : "s")"
        return "\(sources) · \(Topic.label(story.topic)) · \(story.updatedAt.timeAgoShort()) ago"
    }
}

#Preview {
    let sources = [
        StorySource(id: "1", name: "Daily Monitor", url: "", publishedAt: Date(), isBreaking: true),
        StorySource(id: "2", name: "NilePost", url: "", publishedAt: Date(), isBreaking: false),
        StorySource(id: "3", name: "The EastAfrican", url: "", publishedAt: Date(), isBreaking: false),
    ]
    let breakdown = ScoreBreakdown(sourceAuthority: 28, freshness: 22, localRelevance: 15, crossSourceConfirmation: 16, topicImportance: 10)
    return VStack(spacing: 0) {
        ForEach([97, 64, 33, 14], id: \.self) { score in
            StoryRowView(
                story: StorySummary(
                    id: "\(score)", headline: "Bank of Uganda cuts interest rates by 50 basis points",
                    summary: "", topic: "finance", tags: ["finance"], signalScore: score, scoreBreakdown: breakdown,
                    sourceCount: 7, sources: sources, consensus: nil, conflict: nil,
                    updatedAt: Date().addingTimeInterval(-3600), createdAt: Date()),
                isCached: score == 64
            )
        }
    }
    .background(Color.black)
}