import SwiftUI

// MARK: - Title Goal Picker

struct TitleGoalPicker: View {
    @Binding var selectedGoal: TitleGoal

    var body: some View {
        LazyVGrid(
            columns: [GridItem(.flexible()), GridItem(.flexible())],
            spacing: 8
        ) {
            ForEach(TitleGoal.allCases) { goal in
                Button {
                    selectedGoal = goal
                } label: {
                    VStack(alignment: .leading, spacing: 2) {
                        Text(goal.title)
                            .font(.system(size: 11, weight: .semibold))
                            .foregroundStyle(AppTheme.textPrimary)
                        Text(goal.subtitle)
                            .font(.system(size: 9))
                            .foregroundStyle(AppTheme.textTertiary)
                            .lineLimit(1)
                    }
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding(.horizontal, 10)
                    .padding(.vertical, 8)
                    .background(
                        RoundedRectangle(cornerRadius: 8)
                            .fill(
                                selectedGoal == goal
                                    ? AppTheme.accentBlue.opacity(0.15)
                                    : AppTheme.panelBackground
                            )
                    )
                    .overlay(
                        RoundedRectangle(cornerRadius: 8)
                            .stroke(
                                selectedGoal == goal
                                    ? AppTheme.accentBlue.opacity(0.5)
                                    : AppTheme.cardBorder,
                                lineWidth: 1
                            )
                    )
                }
                .buttonStyle(AppPlainButtonStyle())
        .hoverOverlay(cornerRadius: 8)
            }
        }
    }
}

// MARK: - Variant Count Picker

struct TitleVariantCountPicker: View {
    @Binding var selectedCount: TitleVariantCount

    var body: some View {
        HStack(spacing: 8) {
            ForEach(TitleVariantCount.allCases) { count in
                Button {
                    selectedCount = count
                } label: {
                    Text(count.label)
                        .font(.system(size: 10, weight: .semibold))
                        .foregroundStyle(selectedCount == count ? .white : AppTheme.textSecondary)
                        .frame(maxWidth: .infinity)
                        .padding(.vertical, 7)
                        .background(
                            RoundedRectangle(cornerRadius: 7)
                                .fill(
                                    selectedCount == count
                                        ? AppTheme.accentBlue
                                        : AppTheme.panelBackground
                                )
                        )
                        .overlay(
                            RoundedRectangle(cornerRadius: 7)
                                .stroke(AppTheme.cardBorder, lineWidth: 1)
                        )
                }
                .buttonStyle(AppPlainButtonStyle())
        .hoverOverlay(cornerRadius: 8)
            }
        }
    }
}

// MARK: - Title Analysis Card

struct TitleAnalysisCard: View {
    let analysis: TitleAnalysis

    var body: some View {
        VStack(alignment: .leading, spacing: 14) {
            HStack {
                VStack(alignment: .leading, spacing: 2) {
                    Text("Title Analysis")
                        .font(.system(size: 12, weight: .semibold))
                        .foregroundStyle(AppTheme.textPrimary)
                    Text("How your current title performs")
                        .font(.system(size: 10))
                        .foregroundStyle(AppTheme.textSecondary)
                }

                Spacer()

                TitleScoreBadge(score: analysis.overallScore, size: .large)
            }

            HStack(spacing: 12) {
                scoreMetric(label: "Length", score: analysis.lengthScore)
                scoreMetric(label: "Engagement", score: analysis.engagementScore)
                scoreMetric(label: "Clarity", score: analysis.clarityScore)
            }

            if !analysis.suggestions.isEmpty {
                VStack(alignment: .leading, spacing: 6) {
                    Text("Suggestions")
                        .font(.system(size: 10, weight: .medium))
                        .foregroundStyle(AppTheme.textTertiary)

                    ForEach(analysis.suggestions, id: \.self) { suggestion in
                        HStack(alignment: .top, spacing: 6) {
                            Image(systemName: "lightbulb.fill")
                                .font(.system(size: 9))
                                .foregroundStyle(AppTheme.accentYellow)
                                .padding(.top, 2)
                            Text(suggestion)
                                .font(.system(size: 10))
                                .foregroundStyle(AppTheme.textSecondary)
                                .fixedSize(horizontal: false, vertical: true)
                        }
                    }
                }
            }
        }
        .padding(14)
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(
            RoundedRectangle(cornerRadius: AppTheme.cornerRadiusSmall)
                .fill(AppTheme.cardBackground)
                .overlay(
                    RoundedRectangle(cornerRadius: AppTheme.cornerRadiusSmall)
                        .stroke(AppTheme.cardBorder, lineWidth: 1)
                )
        )
    }

    private func scoreMetric(label: String, score: Int) -> some View {
        VStack(spacing: 4) {
            TitleScoreBadge(score: score, size: .small)
            Text(label)
                .font(.system(size: 9, weight: .medium))
                .foregroundStyle(AppTheme.textTertiary)
        }
        .frame(maxWidth: .infinity)
    }
}

// MARK: - Score Badge

struct TitleScoreBadge: View {
    enum Size {
        case small
        case large

        var fontSize: CGFloat {
            switch self {
            case .small: 11
            case .large: 18
            }
        }

        var padding: CGFloat {
            switch self {
            case .small: 6
            case .large: 10
            }
        }
    }

    let score: Int
    var size: Size = .small

    var body: some View {
        Text("\(score)")
            .font(.system(size: size.fontSize, weight: .bold, design: .rounded))
            .foregroundStyle(scoreColor)
            .padding(size.padding)
            .background(
                Circle()
                    .fill(scoreColor.opacity(0.15))
            )
            .overlay(
                Circle()
                    .stroke(scoreColor.opacity(0.3), lineWidth: 1)
            )
    }

    private var scoreColor: Color {
        switch score {
        case 80...100: AppTheme.accentGreen
        case 60..<80: AppTheme.accentYellow
        case 40..<60: AppTheme.accentOrange
        default: Color(hex: 0xEF4444)
        }
    }
}

// MARK: - Title Variant Row

struct TitleVariantRow: View {
    let variant: TitleVariant
    let isSelected: Bool
    let onApply: () -> Void

    var body: some View {
        HStack(alignment: .top, spacing: 12) {
            Button(action: onApply) {
                Circle()
                    .stroke(isSelected ? AppTheme.accentBlue : AppTheme.cardBorder, lineWidth: 2)
                    .frame(width: 16, height: 16)
                    .overlay {
                        if isSelected {
                            Circle()
                                .fill(AppTheme.accentBlue)
                                .frame(width: 8, height: 8)
                        }
                    }
            }
            .buttonStyle(AppPlainButtonStyle())
        .hoverOverlay(cornerRadius: 8)
            .padding(.top, 2)

            VStack(alignment: .leading, spacing: 6) {
                HStack(alignment: .top) {
                    Text(variant.title)
                        .font(.system(size: 12, weight: .medium))
                        .foregroundStyle(AppTheme.textPrimary)
                        .fixedSize(horizontal: false, vertical: true)

                    Spacer(minLength: 8)

                    TitleScoreBadge(score: variant.score)
                }

                Text(variant.reasoning)
                    .font(.system(size: 10))
                    .foregroundStyle(AppTheme.textTertiary)

                HStack(spacing: 8) {
                    Text("\(variant.title.count) chars")
                        .font(.system(size: 9))
                        .foregroundStyle(
                            variant.title.count > 300 ? Color(hex: 0xF87171) : AppTheme.textTertiary
                        )

                    Spacer()

                    Button(action: onApply) {
                        Text("Use Title")
                            .font(.system(size: 10, weight: .semibold))
                            .foregroundStyle(AppTheme.accentBlue)
                    }
                    .buttonStyle(AppPlainButtonStyle())
        .hoverOverlay(cornerRadius: 8)
                }
            }
        }
        .padding(12)
        .background(
            RoundedRectangle(cornerRadius: 8)
                .fill(isSelected ? AppTheme.accentBlue.opacity(0.08) : AppTheme.panelBackground)
        )
        .overlay(
            RoundedRectangle(cornerRadius: 8)
                .stroke(
                    isSelected ? AppTheme.accentBlue.opacity(0.4) : AppTheme.cardBorder,
                    lineWidth: 1
                )
        )
        .hoverCard(cornerRadius: 8, isSelected: isSelected)
        .hoverCursor()
        .onTapGesture(perform: onApply)
    }
}

// MARK: - Compare Card

struct TitleCompareCard: View {
    let title: String
    let score: Int?
    let label: String
    let isOriginal: Bool
    var isSelected: Bool = false

    var body: some View {
        VStack(alignment: .leading, spacing: 10) {
            HStack {
                Text(label)
                    .font(.system(size: 10, weight: .semibold))
                    .foregroundStyle(isOriginal ? AppTheme.textSecondary : AppTheme.accentBlue)
                    .padding(.horizontal, 8)
                    .padding(.vertical, 3)
                    .background(
                        Capsule()
                            .fill(
                                isOriginal
                                    ? AppTheme.panelBackground
                                    : AppTheme.accentBlue.opacity(0.15)
                            )
                    )

                Spacer()

                if let score {
                    TitleScoreBadge(score: score)
                }
            }

            Text(title.isEmpty ? "No title" : title)
                .font(.system(size: 13, weight: .semibold))
                .foregroundStyle(title.isEmpty ? AppTheme.textTertiary : AppTheme.textPrimary)
                .fixedSize(horizontal: false, vertical: true)

            HStack {
                Text("\(title.count) / 300 characters")
                    .font(.system(size: 9))
                    .foregroundStyle(
                        title.count > 300 ? Color(hex: 0xF87171) : AppTheme.textTertiary
                    )

                Spacer()

                if isSelected {
                    Label("Active", systemImage: "checkmark.circle.fill")
                        .font(.system(size: 9, weight: .semibold))
                        .foregroundStyle(AppTheme.accentGreen)
                }
            }
        }
        .padding(14)
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(
            RoundedRectangle(cornerRadius: AppTheme.cornerRadiusSmall)
                .fill(AppTheme.cardBackground)
                .overlay(
                    RoundedRectangle(cornerRadius: AppTheme.cornerRadiusSmall)
                        .stroke(
                            isSelected ? AppTheme.accentBlue.opacity(0.5) : AppTheme.cardBorder,
                            lineWidth: isSelected ? 1.5 : 1
                        )
                )
        )
        .hoverCard(cornerRadius: AppTheme.cornerRadiusSmall, isSelected: isSelected)
        .hoverCursor()
    }
}

// MARK: - Feed Preview Row

struct TitleFeedPreviewRow: View {
    let title: String
    let subreddit: String
    var isHighlighted: Bool = false

    var body: some View {
        HStack(alignment: .top, spacing: 10) {
            RoundedRectangle(cornerRadius: 4)
                .fill(AppTheme.cardBackground)
                .frame(width: 72, height: 52)
                .overlay {
                    Image(systemName: "photo")
                        .font(.system(size: 16))
                        .foregroundStyle(AppTheme.textTertiary)
                }

            VStack(alignment: .leading, spacing: 4) {
                Text(subreddit)
                    .font(.system(size: 9, weight: .semibold))
                    .foregroundStyle(AppTheme.textTertiary)

                Text(title.isEmpty ? "Title preview" : title)
                    .font(.system(size: 11, weight: .semibold))
                    .foregroundStyle(title.isEmpty ? AppTheme.textTertiary : AppTheme.textPrimary)
                    .lineLimit(2)
                    .fixedSize(horizontal: false, vertical: true)
            }

            Spacer(minLength: 0)
        }
        .padding(10)
        .background(
            RoundedRectangle(cornerRadius: 8)
                .fill(isHighlighted ? AppTheme.accentBlue.opacity(0.08) : AppTheme.panelBackground)
        )
        .overlay(
            RoundedRectangle(cornerRadius: 8)
                .stroke(
                    isHighlighted ? AppTheme.accentBlue.opacity(0.4) : AppTheme.cardBorder,
                    lineWidth: 1
                )
        )
    }
}

// MARK: - Empty State

struct TitleOptimizerEmptyState: View {
    let icon: String
    let title: String
    let subtitle: String

    var body: some View {
        VStack(spacing: 10) {
            Image(systemName: icon)
                .font(.system(size: 28))
                .foregroundStyle(AppTheme.accentBlue.opacity(0.6))

            Text(title)
                .font(.system(size: 12, weight: .semibold))
                .foregroundStyle(AppTheme.textSecondary)

            Text(subtitle)
                .font(.system(size: 10))
                .foregroundStyle(AppTheme.textTertiary)
                .multilineTextAlignment(.center)
        }
        .frame(maxWidth: .infinity)
        .padding(.vertical, 32)
        .background(
            RoundedRectangle(cornerRadius: 8)
                .fill(AppTheme.panelBackground)
                .overlay(
                    RoundedRectangle(cornerRadius: 8)
                        .strokeBorder(
                            AppTheme.accentBlue.opacity(0.2),
                            style: StrokeStyle(lineWidth: 1, dash: [6, 4])
                        )
                )
        )
    }
}