//
//  PollDetailView.swift
//  SportsTime
//
//  View for displaying poll details and results
//

import SwiftUI

struct PollDetailView: View {
    @Environment(\.dismiss) private var dismiss
    @Environment(\.colorScheme) private var colorScheme
    @State private var viewModel = PollDetailViewModel()
    @State private var showShareSheet = false
    @State private var showDeleteConfirmation = false
    @State private var showVotingSheet = false
    @State private var isOwner = false

    let pollId: UUID?
    let shareCode: String?

    init(pollId: UUID) {
        self.pollId = pollId
        self.shareCode = nil
    }

    init(shareCode: String) {
        self.pollId = nil
        self.shareCode = shareCode
    }

    var body: some View {
        Group {
            if viewModel.isLoading && viewModel.poll == nil {
                ProgressView("Loading poll...")
            } else if let poll = viewModel.poll {
                pollContent(poll)
            } else if let error = viewModel.error {
                ContentUnavailableView(
                    "Poll Not Found",
                    systemImage: "exclamationmark.triangle",
                    description: Text(error.localizedDescription)
                )
            }
        }
        .navigationTitle(viewModel.poll?.title ?? "Poll")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            if viewModel.poll != nil {
                ToolbarItem(placement: .primaryAction) {
                    Menu {
                        Button {
                            showShareSheet = true
                        } label: {
                            Label("Share Poll", systemImage: "square.and.arrow.up")
                        }

                        if isOwner {
                            Divider()

                            Button(role: .destructive) {
                                showDeleteConfirmation = true
                            } label: {
                                Label("Delete Poll", systemImage: "trash")
                            }
                        }
                    } label: {
                        Image(systemName: "ellipsis.circle")
                    }
                }
            }
        }
        .refreshable {
            await viewModel.refresh()
        }
        .task {
            await loadPoll()
            isOwner = await viewModel.isOwner
        }
        .task(id: viewModel.poll?.id) {
            if viewModel.poll != nil {
                isOwner = await viewModel.isOwner
            }
        }
        .onDisappear {
            Task {
                await viewModel.cleanup()
            }
        }
        .sheet(isPresented: $showShareSheet) {
            if let url = viewModel.shareURL {
                ShareSheet(items: [url])
            }
        }
        .sheet(isPresented: $showVotingSheet) {
            if let poll = viewModel.poll {
                PollVotingView(poll: poll, existingVote: viewModel.myVote) {
                    Task {
                        await viewModel.refresh()
                    }
                }
            }
        }
        .confirmationDialog("Delete Poll", isPresented: $showDeleteConfirmation, titleVisibility: .visible) {
            Button("Delete", role: .destructive) {
                Task {
                    if await viewModel.deletePoll() {
                        dismiss()
                    }
                }
            }
            Button("Cancel", role: .cancel) {}
        } message: {
            Text("This will permanently delete the poll and all votes. This action cannot be undone.")
        }
    }

    @ViewBuilder
    private func pollContent(_ poll: TripPoll) -> some View {
        ScrollView {
            VStack(spacing: 20) {
                // Share Code Card
                shareCodeCard(poll)

                // Voting Status
                votingStatusCard

                // Results
                if let results = viewModel.results {
                    resultsSection(results)
                }

                // Trip Previews
                tripPreviewsSection(poll)
            }
            .padding()
        }
    }

    @ViewBuilder
    private func shareCodeCard(_ poll: TripPoll) -> some View {
        VStack(spacing: 8) {
            Text("Share Code")
                .font(.caption)
                .foregroundStyle(.secondary)

            Text(poll.shareCode)
                .font(.system(size: 32, weight: .bold, design: .monospaced))
                .foregroundStyle(Theme.warmOrange)

            Text("sportstime://poll/\(poll.shareCode)")
                .font(.caption2)
                .foregroundStyle(.secondary)
        }
        .frame(maxWidth: .infinity)
        .padding()
        .background(Theme.cardBackground(colorScheme))
        .clipShape(RoundedRectangle(cornerRadius: 12))
    }

    @ViewBuilder
    private var votingStatusCard: some View {
        HStack {
            VStack(alignment: .leading, spacing: 4) {
                Text(viewModel.hasVoted ? "You voted" : "You haven't voted yet")
                    .font(.headline)

                Text("\(viewModel.votes.count) total votes")
                    .font(.subheadline)
                    .foregroundStyle(.secondary)
            }

            Spacer()

            Button(viewModel.hasVoted ? "Change Vote" : "Vote Now") {
                showVotingSheet = true
            }
            .buttonStyle(.borderedProminent)
            .tint(Theme.warmOrange)
        }
        .padding()
        .background(Theme.cardBackground(colorScheme))
        .clipShape(RoundedRectangle(cornerRadius: 12))
    }

    @ViewBuilder
    private func resultsSection(_ results: PollResults) -> some View {
        VStack(alignment: .leading, spacing: 12) {
            Text("Results")
                .font(.headline)

            ForEach(results.tripScores, id: \.tripIndex) { item in
                let trip = results.poll.tripSnapshots[item.tripIndex]
                ResultRow(
                    rank: results.tripScores.firstIndex { $0.tripIndex == item.tripIndex }! + 1,
                    tripName: trip.name,
                    score: item.score,
                    percentage: results.scorePercentage(for: item.tripIndex)
                )
            }
        }
        .padding()
        .background(Theme.cardBackground(colorScheme))
        .clipShape(RoundedRectangle(cornerRadius: 12))
    }

    @ViewBuilder
    private func tripPreviewsSection(_ poll: TripPoll) -> some View {
        VStack(alignment: .leading, spacing: 12) {
            Text("Trip Options")
                .font(.headline)

            ForEach(Array(poll.tripSnapshots.enumerated()), id: \.element.id) { index, trip in
                TripPreviewCard(trip: trip, index: index + 1)
            }
        }
    }

    private func loadPoll() async {
        if let pollId {
            await viewModel.loadPoll(byId: pollId)
        } else if let shareCode {
            await viewModel.loadPoll(byShareCode: shareCode)
        }
    }
}

// MARK: - Result Row

private struct ResultRow: View {
    let rank: Int
    let tripName: String
    let score: Int
    let percentage: Double

    var body: some View {
        HStack(spacing: 12) {
            Text("#\(rank)")
                .font(.headline)
                .foregroundStyle(rank == 1 ? Theme.warmOrange : .secondary)
                .frame(width: 30)

            VStack(alignment: .leading, spacing: 4) {
                Text(tripName)
                    .font(.subheadline)

                GeometryReader { geometry in
                    ZStack(alignment: .leading) {
                        Rectangle()
                            .fill(Color.secondary.opacity(0.2))
                            .frame(height: 8)
                            .clipShape(RoundedRectangle(cornerRadius: 4))

                        Rectangle()
                            .fill(rank == 1 ? Theme.warmOrange : Color.secondary)
                            .frame(width: geometry.size.width * percentage, height: 8)
                            .clipShape(RoundedRectangle(cornerRadius: 4))
                    }
                }
                .frame(height: 8)
            }

            Text("\(score)")
                .font(.caption)
                .foregroundStyle(.secondary)
                .frame(width: 40, alignment: .trailing)
        }
    }
}

// MARK: - Trip Preview Card

private struct TripPreviewCard: View {
    @Environment(\.colorScheme) private var colorScheme
    let trip: Trip
    let index: Int

    var body: some View {
        VStack(alignment: .leading, spacing: 8) {
            HStack {
                Text("Option \(index)")
                    .font(.caption)
                    .fontWeight(.semibold)
                    .foregroundStyle(.white)
                    .padding(.horizontal, 8)
                    .padding(.vertical, 4)
                    .background(Theme.warmOrange)
                    .clipShape(Capsule())

                Text(trip.name)
                    .font(.headline)
            }

            HStack {
                Label("\(trip.stops.count) stops", systemImage: "mappin.and.ellipse")
                Spacer()
                Label("\(trip.stops.flatMap { $0.games }.count) games", systemImage: "sportscourt")
            }
            .font(.caption)
            .foregroundStyle(.secondary)

            // Show cities
            Text(trip.stops.map { $0.city }.joined(separator: " → "))
                .font(.caption)
                .foregroundStyle(.secondary)
                .lineLimit(1)
        }
        .padding()
        .background(Theme.cardBackground(colorScheme))
        .clipShape(RoundedRectangle(cornerRadius: 12))
    }
}

#Preview {
    NavigationStack {
        PollDetailView(shareCode: "ABC123")
    }
}