// Auteur : Simon-Pierre Boucher — contact@spboucher.ai
// HomeView.swift — l'Accueil : le pouls de l'écosystème (compteurs live),
// collections éditoriales (requêtes RÉELLES vers les API — aucun contenu
// inventé), grille des 12 univers, reprise de l'historique récent.
import SwiftUI

struct HomeView: View {
    @EnvironmentObject private var pulse: EcosystemPulse
    @EnvironmentObject private var state: AppState
    @EnvironmentObject private var recents: RecentsStore
    @Environment(\.colorScheme) private var scheme

    private var totalAll: Int {
        // le pouls global = somme des compteurs connus (sans les pages indexées ni le parc Vrai-Prix, hors offre "consommable")
        Ecosystem.all
            .filter { !["trouve-ka", "vrai-prix", "api-ka"].contains($0.id) }
            .compactMap { pulse.totals[$0.id] }
            .reduce(0, +)
    }

    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 22) {
                header
                if recents.alertCount > 0 { alertBanner }
                editorial
                universes
                if !recents.viewed.isEmpty { recentStrip }
                footer
            }
            .padding(20)
            .frame(maxWidth: 1300)
            .frame(maxWidth: .infinity)
        }
        .background(KATheme.paper(scheme))
    }

    // MARK: en-tête

    private var header: some View {
        VStack(alignment: .leading, spacing: 8) {
            GroupeKAMark(size: 30)
            Text("Le Québec entier, lu à la source.")
                .font(KAFont.display(22))
            HStack(spacing: 8) {
                if totalAll > 0 {
                    Text("\(totalAll.fr) éléments en direct")
                        .font(KAFont.mono(11))
                        .padding(.horizontal, 10).padding(.vertical, 5)
                        .background(KATheme.green.opacity(0.12), in: Capsule())
                        .foregroundStyle(KATheme.green)
                        .contentTransition(.numericText())
                }
                Text("\(pulse.servicesUp)/\(pulse.health.count) services en ligne")
                    .font(KAFont.mono(11))
                    .padding(.horizontal, 10).padding(.vertical, 5)
                    .background((pulse.servicesUp == pulse.health.count ? KATheme.green : .orange).opacity(0.12), in: Capsule())
                    .foregroundStyle(pulse.servicesUp == pulse.health.count ? KATheme.green : .orange)
                Spacer()
                Button {
                    state.openUniversalSearch()
                } label: {
                    Label("Recherche universelle", systemImage: "magnifyingglass")
                        .font(.caption.weight(.bold))
                        .padding(.horizontal, 12).padding(.vertical, 7)
                        .background(KATheme.inkLight, in: Capsule())
                        .foregroundStyle(KATheme.lime)
                }
                .buttonStyle(.plain)
                .help("⌘K — une barre pour tous les univers")
            }
        }
    }

    private var alertBanner: some View {
        Button {
            state.selection = .alerts
        } label: {
            HStack(spacing: 10) {
                Image(systemName: "bell.badge.fill").foregroundStyle(.red)
                Text("**+\(recents.alertCount) nouveauté\(recents.alertCount > 1 ? "s" : "")** dans vos recherches sauvegardées")
                    .font(.subheadline)
                Spacer()
                Image(systemName: "chevron.right").font(.caption).foregroundStyle(.secondary)
            }
            .padding(13)
            .frame(maxWidth: .infinity, alignment: .leading)
            .kaCard(accent: .red)
        }
        .buttonStyle(KAPressStyle())
    }

    // MARK: collections éditoriales (requêtes réelles)

    private var editorial: some View {
        VStack(alignment: .leading, spacing: 10) {
            Text("En ce moment").font(.title3.weight(.bold))
            LazyVGrid(columns: [GridItem(.adaptive(minimum: 270), spacing: 12)], spacing: 12) {
                ForEach(Editorial.collections) { c in
                    let u = Ecosystem.universe(c.universeID)
                    Button {
                        state.openUniverse(c.universeID, query: c.query ?? "", params: c.params)
                    } label: {
                        HStack(spacing: 12) {
                            Image(systemName: c.symbol)
                                .font(.title3.weight(.semibold))
                                .foregroundStyle(u?.accent ?? .gray)
                                .frame(width: 42, height: 42)
                                .background((u?.accent ?? .gray).opacity(0.13),
                                            in: RoundedRectangle(cornerRadius: 11, style: .continuous))
                            VStack(alignment: .leading, spacing: 2) {
                                Text(c.title).font(.subheadline.weight(.bold))
                                Text(c.subtitle).font(.caption).foregroundStyle(KATheme.ink2(scheme))
                                    .lineLimit(2)
                            }
                            Spacer()
                            Image(systemName: "chevron.right").font(.caption).foregroundStyle(.tertiary)
                        }
                        .padding(12)
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .kaCard(accent: u?.accent)
                    }
                    .buttonStyle(KAPressStyle())
                }
            }
        }
    }

    // MARK: grille des univers

    private var universes: some View {
        VStack(alignment: .leading, spacing: 10) {
            Text("Les univers").font(.title3.weight(.bold))
            LazyVGrid(columns: [GridItem(.adaptive(minimum: 215), spacing: 13)], spacing: 13) {
                ForEach(Ecosystem.all) { u in
                    Button {
                        state.selection = .universe(u.id)
                    } label: {
                        VStack(alignment: .leading, spacing: 9) {
                            HStack {
                                KALogo(id: u.id, size: 38,
                                       fallbackSymbol: u.symbol, fallbackAccent: u.accent)
                                Spacer()
                                Image(systemName: "chevron.right").font(.caption).foregroundStyle(.tertiary)
                            }
                            KAWordmark(universe: u, size: 16)
                            Text(u.tagline)
                                .font(.caption).foregroundStyle(KATheme.ink2(scheme))
                                .lineLimit(2, reservesSpace: true)
                                .multilineTextAlignment(.leading)
                            if let total = pulse.totals[u.id] {
                                Text("\(total.fr) \(u.unit)")
                                    .font(KAFont.mono(10))
                                    .foregroundStyle(u.accent)
                                    .contentTransition(.numericText())
                            } else {
                                Text("—").font(KAFont.mono(10, bold: false))
                                    .foregroundStyle(.tertiary)
                            }
                        }
                        .padding(13)
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .kaCard(accent: u.accent)
                    }
                    .buttonStyle(KAPressStyle())
                    .accessibilityLabel("\(u.name) — \(u.tagline)")
                }
            }
        }
    }

    // MARK: reprise (derniers consultés)

    private var recentStrip: some View {
        VStack(alignment: .leading, spacing: 10) {
            HStack {
                Text("Reprendre où vous étiez").font(.title3.weight(.bold))
                Spacer()
                Button("Tout l'historique") { state.selection = .history }
                    .buttonStyle(.plain)
                    .font(.caption.weight(.semibold))
                    .foregroundStyle(KATheme.green)
            }
            ScrollView(.horizontal, showsIndicators: false) {
                HStack(spacing: 11) {
                    ForEach(recents.viewed.prefix(8)) { item in
                        Button {
                            state.openUniverse(item.universeID, query: item.title)
                        } label: {
                            KAItemCard(item: item)
                                .frame(width: 230)
                        }
                        .buttonStyle(KAPressStyle())
                    }
                }
                .padding(.vertical, 2)
            }
        }
    }

    private var footer: some View {
        Text(Ecosystem.disclaimer)
            .font(.caption2).foregroundStyle(.tertiary)
            .padding(.top, 4)
    }
}