//
//  AddMoodHeaderView.swift
//  Feels
//
//  Created by Trey Tartt on 1/5/22.
//

import Foundation
import SwiftUI
import CoreData

struct AddMoodHeaderView: View {
    @AppStorage(UserDefaultsStore.Keys.theme.rawValue, store: GroupUserDefaults.groupDefaults) private var theme: Theme = .system
    @AppStorage(UserDefaultsStore.Keys.moodTint.rawValue, store: GroupUserDefaults.groupDefaults) private var moodTint: MoodTints = .Default
    @AppStorage(UserDefaultsStore.Keys.textColor.rawValue, store: GroupUserDefaults.groupDefaults) private var textColor: Color = DefaultTextColor.textColor
    @AppStorage(UserDefaultsStore.Keys.votingLayoutStyle.rawValue, store: GroupUserDefaults.groupDefaults) private var votingLayoutStyle: Int = 0

    @State var onboardingData = OnboardingDataDataManager.shared.savedOnboardingData

    let addItemHeaderClosure: ((Mood, Date) -> Void)

    init(addItemHeaderClosure: @escaping ((Mood, Date) -> Void)) {
        self.addItemHeaderClosure = addItemHeaderClosure
    }

    private var layoutStyle: VotingLayoutStyle {
        VotingLayoutStyle(rawValue: votingLayoutStyle) ?? .horizontal
    }

    var body: some View {
        ZStack {
            theme.currentTheme.secondaryBGColor

            VStack(spacing: 16) {
                Text(ShowBasedOnVoteLogics.getVotingTitle(onboardingData: onboardingData))
                    .font(.title2.bold())
                    .foregroundColor(textColor)
                    .padding(.top)

                votingLayoutContent
                    .padding(.bottom)
            }
            .padding(.horizontal)
        }
        .cornerRadius(Constants.viewsCornerRaidus, corners: [.topLeft, .topRight, .bottomLeft, .bottomRight])
        .frame(minWidth: 0, maxWidth: .infinity)
    }

    @ViewBuilder
    private var votingLayoutContent: some View {
        switch layoutStyle {
        case .horizontal:
            HorizontalVotingView(moodTint: moodTint, onMoodSelected: addItem)
        case .cards:
            CardVotingView(moodTint: moodTint, onMoodSelected: addItem)
        case .radial:
            RadialVotingView(moodTint: moodTint, onMoodSelected: addItem)
        case .stacked:
            StackedVotingView(moodTint: moodTint, onMoodSelected: addItem)
        }
    }

    private func addItem(withMood mood: Mood) {
        let impactFeedback = UIImpactFeedbackGenerator(style: .medium)
        impactFeedback.impactOccurred()

        let date = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: onboardingData)
        addItemHeaderClosure(mood, date)
    }
}

// MARK: - Layout 1: Horizontal (Polished version of current)
struct HorizontalVotingView: View {
    let moodTint: MoodTints
    let onMoodSelected: (Mood) -> Void

    var body: some View {
        HStack(spacing: 8) {
            ForEach(Mood.allValues) { mood in
                Button(action: { onMoodSelected(mood) }) {
                    mood.icon
                        .resizable()
                        .aspectRatio(contentMode: .fit)
                        .frame(width: 55, height: 55)
                        .foregroundColor(moodTint.color(forMood: mood))
                }
                .buttonStyle(MoodButtonStyle())
                .frame(maxWidth: .infinity)
            }
        }
    }
}

// MARK: - Layout 2: Cards Grid
struct CardVotingView: View {
    let moodTint: MoodTints
    let onMoodSelected: (Mood) -> Void

    private let columns = [
        GridItem(.flexible(), spacing: 12),
        GridItem(.flexible(), spacing: 12),
        GridItem(.flexible(), spacing: 12)
    ]

    var body: some View {
        LazyVGrid(columns: columns, spacing: 12) {
            ForEach(Mood.allValues) { mood in
                Button(action: { onMoodSelected(mood) }) {
                    VStack(spacing: 8) {
                        mood.icon
                            .resizable()
                            .aspectRatio(contentMode: .fit)
                            .frame(width: 40, height: 40)
                            .foregroundColor(moodTint.color(forMood: mood))

                        Text(mood.strValue)
                            .font(.caption.weight(.medium))
                            .foregroundColor(moodTint.color(forMood: mood))
                    }
                    .frame(maxWidth: .infinity)
                    .padding(.vertical, 16)
                    .background(
                        RoundedRectangle(cornerRadius: 12)
                            .fill(moodTint.color(forMood: mood).opacity(0.15))
                    )
                    .overlay(
                        RoundedRectangle(cornerRadius: 12)
                            .stroke(moodTint.color(forMood: mood).opacity(0.3), lineWidth: 1)
                    )
                }
                .buttonStyle(CardButtonStyle())
            }
        }
    }
}

// MARK: - Layout 3: Radial/Semi-circle
struct RadialVotingView: View {
    let moodTint: MoodTints
    let onMoodSelected: (Mood) -> Void

    var body: some View {
        GeometryReader { geometry in
            let center = CGPoint(x: geometry.size.width / 2, y: geometry.size.height * 0.9)
            let radius = min(geometry.size.width, geometry.size.height) * 0.65
            let moods = Mood.allValues

            ZStack {
                ForEach(Array(moods.enumerated()), id: \.element.id) { index, mood in
                    let angle = angleForIndex(index, total: moods.count)
                    let position = positionForAngle(angle, radius: radius, center: center)

                    Button(action: { onMoodSelected(mood) }) {
                        VStack(spacing: 4) {
                            mood.icon
                                .resizable()
                                .aspectRatio(contentMode: .fit)
                                .frame(width: 44, height: 44)
                                .foregroundColor(moodTint.color(forMood: mood))

                            Text(mood.strValue)
                                .font(.caption2.weight(.medium))
                                .foregroundColor(moodTint.color(forMood: mood))
                        }
                        .padding(8)
                        .background(
                            Circle()
                                .fill(moodTint.color(forMood: mood).opacity(0.1))
                        )
                    }
                    .buttonStyle(MoodButtonStyle())
                    .position(position)
                }
            }
        }
        .frame(height: 180)
    }

    private func angleForIndex(_ index: Int, total: Int) -> Double {
        // Spread moods across a semi-circle (180 degrees), from left to right
        let startAngle = Double.pi  // 180 degrees (left)
        let endAngle = 0.0          // 0 degrees (right)
        let step = (startAngle - endAngle) / Double(total - 1)
        return startAngle - (step * Double(index))
    }

    private func positionForAngle(_ angle: Double, radius: CGFloat, center: CGPoint) -> CGPoint {
        CGPoint(
            x: center.x + radius * CGFloat(cos(angle)),
            y: center.y - radius * CGFloat(sin(angle))
        )
    }
}

// MARK: - Layout 4: Stacked Full-width
struct StackedVotingView: View {
    let moodTint: MoodTints
    let onMoodSelected: (Mood) -> Void

    var body: some View {
        VStack(spacing: 10) {
            ForEach(Mood.allValues) { mood in
                Button(action: { onMoodSelected(mood) }) {
                    HStack(spacing: 16) {
                        mood.icon
                            .resizable()
                            .aspectRatio(contentMode: .fit)
                            .frame(width: 36, height: 36)
                            .foregroundColor(moodTint.color(forMood: mood))

                        Text(mood.strValue)
                            .font(.body.weight(.semibold))
                            .foregroundColor(moodTint.color(forMood: mood))

                        Spacer()

                        Image(systemName: "chevron.right")
                            .font(.caption.weight(.semibold))
                            .foregroundColor(moodTint.color(forMood: mood).opacity(0.5))
                    }
                    .padding(.horizontal, 16)
                    .padding(.vertical, 14)
                    .background(
                        RoundedRectangle(cornerRadius: 12)
                            .fill(moodTint.color(forMood: mood).opacity(0.12))
                    )
                }
                .buttonStyle(CardButtonStyle())
            }
        }
    }
}

// MARK: - Button Styles
struct MoodButtonStyle: ButtonStyle {
    func makeBody(configuration: Configuration) -> some View {
        configuration.label
            .scaleEffect(configuration.isPressed ? 0.9 : 1.0)
            .animation(.easeInOut(duration: 0.15), value: configuration.isPressed)
    }
}

struct CardButtonStyle: ButtonStyle {
    func makeBody(configuration: Configuration) -> some View {
        configuration.label
            .scaleEffect(configuration.isPressed ? 0.96 : 1.0)
            .opacity(configuration.isPressed ? 0.8 : 1.0)
            .animation(.easeInOut(duration: 0.15), value: configuration.isPressed)
    }
}

// MARK: - Previews
struct AddMoodHeaderView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            AddMoodHeaderView(addItemHeaderClosure: { (_,_) in

            }).environment(\.managedObjectContext, PersistenceController.shared.viewContext)

            AddMoodHeaderView(addItemHeaderClosure: { (_,_) in

            }).preferredColorScheme(.dark).environment(\.managedObjectContext, PersistenceController.shared.viewContext)
        }
    }
}