//
//  ProgressCardGenerator.swift
//  SportsTime
//
//  Shareable progress cards — unified design language.
//  Solid color bg, progress ring with fraction, plain white text, app icon footer.
//

import SwiftUI
import UIKit

// MARK: - Progress Share Content

struct ProgressShareContent: ShareableContent {
    let progress: LeagueProgress
    let tripCount: Int

    var cardType: ShareCardType { .stadiumProgress }

    @MainActor
    func render(theme: ShareTheme) async throws -> UIImage {
        let mapGenerator = ShareMapSnapshotGenerator()
        let mapSnapshot = await mapGenerator.generateProgressMap(
            visited: progress.stadiumsVisited,
            remaining: progress.stadiumsRemaining,
            theme: theme
        )

        let renderer = ImageRenderer(content: ProgressCardView(
            progress: progress,
            tripCount: tripCount,
            theme: theme,
            mapSnapshot: mapSnapshot
        ))
        renderer.scale = 3.0

        guard let image = renderer.uiImage else {
            throw ShareError.renderingFailed
        }
        return image
    }
}

// MARK: - Progress Card View

private struct ProgressCardView: View {
    let progress: LeagueProgress
    let tripCount: Int
    let theme: ShareTheme
    let mapSnapshot: UIImage?

    private let gold = Color(hex: "FFD700")

    private var isComplete: Bool {
        progress.completionPercentage >= 100
    }

    private var accent: Color {
        isComplete ? gold : theme.accentColor
    }

    private var remaining: Int {
        max(0, progress.totalStadiums - progress.visitedStadiums)
    }

    var body: some View {
        ZStack {
            (theme.gradientColors.first ?? .black)
                .ignoresSafeArea()

            VStack(spacing: 0) {
                // Header
                Text(progress.sport.displayName.uppercased())
                    .font(.system(size: 20, weight: .black))
                    .tracking(8)
                    .foregroundStyle(theme.secondaryTextColor)
                    .padding(.top, 20)

                Text("STADIUM QUEST")
                    .font(.system(size: 44, weight: .black))
                    .foregroundStyle(theme.textColor)
                    .padding(.top, 8)

                if isComplete {
                    Text("COMPLETE")
                        .font(.system(size: 18, weight: .black))
                        .tracking(4)
                        .foregroundStyle(gold)
                        .padding(.top, 6)
                }

                Spacer()

                // Progress ring with fraction inside
                ZStack {
                    Circle()
                        .stroke(theme.textColor.opacity(0.1), lineWidth: 24)
                        .frame(width: 400, height: 400)

                    Circle()
                        .trim(from: 0, to: progress.completionPercentage / 100)
                        .stroke(accent, style: StrokeStyle(lineWidth: 24, lineCap: .round))
                        .frame(width: 400, height: 400)
                        .rotationEffect(.degrees(-90))

                    VStack(spacing: 8) {
                        Text("\(progress.visitedStadiums)")
                            .font(.system(size: 120, weight: .black, design: .rounded))
                            .foregroundStyle(accent)

                        Rectangle()
                            .fill(theme.textColor.opacity(0.2))
                            .frame(width: 140, height: 3)

                        Text("\(progress.totalStadiums)")
                            .font(.system(size: 60, weight: .black, design: .rounded))
                            .foregroundStyle(theme.textColor.opacity(0.4))
                    }
                }

                Spacer().frame(height: 40)

                // Stats
                HStack(spacing: 50) {
                    statItem(value: "\(progress.visitedStadiums)", label: "VISITED")
                    statItem(value: "\(remaining)", label: "TO GO")
                    statItem(value: "\(tripCount)", label: "TRIPS")
                }

                Spacer().frame(height: 40)

                // Map
                if let mapSnapshot {
                    Image(uiImage: mapSnapshot)
                        .resizable()
                        .aspectRatio(contentMode: .fit)
                        .clipShape(RoundedRectangle(cornerRadius: 24))
                        .padding(.horizontal, 16)
                }

                Spacer()

                ProgressCardAppFooter(theme: theme)
            }
            .padding(ShareCardDimensions.padding)
        }
        .frame(width: ShareCardDimensions.cardSize.width, height: ShareCardDimensions.cardSize.height)
    }

    private func statItem(value: String, label: String) -> some View {
        VStack(spacing: 6) {
            Text(value)
                .font(.system(size: 44, weight: .black, design: .rounded))
                .foregroundStyle(accent)
            Text(label)
                .font(.system(size: 14, weight: .bold))
                .tracking(2)
                .foregroundStyle(theme.secondaryTextColor)
        }
    }
}

// MARK: - App Footer

private struct ProgressCardAppFooter: View {
    let theme: ShareTheme

    var body: some View {
        VStack(spacing: 8) {
            if let icon = Self.loadAppIcon() {
                Image(uiImage: icon)
                    .resizable()
                    .aspectRatio(contentMode: .fill)
                    .frame(width: 56, height: 56)
                    .clipShape(RoundedRectangle(cornerRadius: 13))
            }

            Text("SportsTime")
                .font(.system(size: 18, weight: .bold))
                .foregroundStyle(theme.textColor.opacity(0.5))
        }
        .padding(.bottom, 10)
    }

    private static func loadAppIcon() -> UIImage? {
        if let icons = Bundle.main.infoDictionary?["CFBundleIcons"] as? [String: Any],
           let primary = icons["CFBundlePrimaryIcon"] as? [String: Any],
           let files = primary["CFBundleIconFiles"] as? [String],
           let name = files.last {
            return UIImage(named: name)
        }
        return nil
    }
}