// SecondaryTabs.swift
// Jarvis — Latest / Saved / Search. Required by RootTabView; they reuse the
// signal-feed components rather than introducing new surfaces.

import SwiftUI
import SwiftData

// Shared destinations so taps work inside each tab's own NavigationStack.
private extension View {
    func jarvisDestinations() -> some View {
        self
            .navigationDestination(for: StorySummary.self) { StoryDetailView(story: $0) }
            .navigationDestination(for: ArticleRoute.self) { ArticleReaderView(route: $0) }
    }
}

private struct TabHeader: View {
    let title: String
    var body: some View {
        HStack {
            JarvisWordmark(size: 26)
            Text(title)
                .font(.system(size: 13, weight: .bold))
                .foregroundStyle(Color(hex: "666666"))
                .padding(.top, 6)
            Spacer()
        }
        .padding(.horizontal, 16)
        .padding(.top, 8)
        .padding(.bottom, 12)
    }
}

private struct StoryList: View {
    let stories: [StorySummary]
    let cachedIds: Set<String>
    var readIds: Set<String> = []
    var body: some View {
        ScrollView {
            LazyVStack(spacing: 0) {
                ForEach(stories) { story in
                    NavigationLink(value: story) {
                        StoryRowView(story: story,
                                     isCached: cachedIds.contains(story.id),
                                     isRead: readIds.contains(story.id))
                    }
                    .buttonStyle(.plain)
                }
            }
        }
    }
}

// MARK: - Latest (most recently formed stories first)

struct LatestView: View {
    @EnvironmentObject var store: StoryStore
    @Query private var cachedArticles: [CachedArticle]
    @Query private var readStories: [ReadStory]

    private var latest: [StorySummary] {
        store.stories.sorted { $0.createdAt > $1.createdAt }
    }

    var body: some View {
        NavigationStack {
            ZStack {
                Color.black.ignoresSafeArea()
                VStack(spacing: 0) {
                    TabHeader(title: "Latest")
                    Divider().overlay(Palette.hairline)
                    StoryList(stories: latest, cachedIds: Set(cachedArticles.map(\.storyId)),
                              readIds: Set(readStories.map(\.id)))
                }
            }
            .navigationBarHidden(true)
            .jarvisDestinations()
        }
    }
}

// MARK: - Saved (offline cache)

struct SavedView: View {
    @Query private var cachedStories: [CachedStory]
    @Query private var cachedArticles: [CachedArticle]
    @Query private var readStories: [ReadStory]
    @Query private var savedStories: [SavedStory]

    private var stories: [StorySummary] {
        let savedIds = Set(savedStories.map(\.id))
        return cachedStories
            .filter { savedIds.contains($0.id) }
            .map(StorySummary.init(cached:))
            .sorted(by: StorySummary.feedOrder)
    }

    var body: some View {
        NavigationStack {
            ZStack {
                Color.black.ignoresSafeArea()
                VStack(spacing: 0) {
                    TabHeader(title: "Saved")
                    Divider().overlay(Palette.hairline)
                    if stories.isEmpty {
                        VStack(spacing: 12) {
                            Image(systemName: "bookmark")
                                .font(.system(size: 28)).foregroundStyle(Color(hex: "333333"))
                            Text("Nothing saved yet")
                                .font(.system(size: 14, weight: .bold))
                                .foregroundStyle(Color(hex: "555555"))
                            Text("Swipe a story left to save it")
                                .font(.system(size: 12))
                                .foregroundStyle(Color(hex: "444444"))
                        }
                        .frame(maxWidth: .infinity, maxHeight: .infinity)
                    } else {
                        StoryList(stories: stories, cachedIds: Set(cachedArticles.map(\.storyId)),
                                  readIds: Set(readStories.map(\.id)))
                    }
                }
            }
            .navigationBarHidden(true)
            .jarvisDestinations()
        }
    }
}

// MARK: - Search

struct SearchView: View {
    @EnvironmentObject var store: StoryStore
    @Query private var cachedArticles: [CachedArticle]
    @Query private var readStories: [ReadStory]
    @State private var query = ""

    private var results: [StorySummary] {
        guard !query.isEmpty else { return [] }
        return store.stories
            .filter { $0.headline.localizedCaseInsensitiveContains(query)
                   || $0.summary.localizedCaseInsensitiveContains(query) }
            .sorted(by: StorySummary.feedOrder)
    }

    var body: some View {
        NavigationStack {
            ZStack {
                Color.black.ignoresSafeArea()
                VStack(spacing: 0) {
                    TabHeader(title: "Search")
                    searchBar
                    Divider().overlay(Palette.hairline)
                    if query.isEmpty {
                        placeholder("Search stories by headline")
                    } else if results.isEmpty {
                        placeholder("No matches for “\(query)”")
                    } else {
                        StoryList(stories: results, cachedIds: Set(cachedArticles.map(\.storyId)),
                                  readIds: Set(readStories.map(\.id)))
                    }
                }
            }
            .navigationBarHidden(true)
            .jarvisDestinations()
        }
    }

    private var searchBar: some View {
        HStack(spacing: 10) {
            Image(systemName: "magnifyingglass")
                .font(.system(size: 14)).foregroundStyle(Color(hex: "555555"))
            TextField("", text: $query,
                      prompt: Text("Search").foregroundColor(Color(hex: "555555")))
                .font(.system(size: 15))
                .foregroundStyle(.white)
                .autocorrectionDisabled()
        }
        .padding(.horizontal, 14)
        .frame(height: 44)
        .background(Palette.surface2)
        .clipShape(RoundedRectangle(cornerRadius: 10))
        .padding(.horizontal, 16)
        .padding(.bottom, 10)
    }

    private func placeholder(_ text: String) -> some View {
        Text(text)
            .font(.system(size: 14, weight: .bold))
            .foregroundStyle(Color(hex: "555555"))
            .frame(maxWidth: .infinity, maxHeight: .infinity)
    }
}