//
// SplitsView.swift
// Workouts
//
// Created by rzen on 7/17/25 at 6:55 PM.
//
// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
//

import SwiftUI
import SwiftData

struct SplitsView: View {
    @Environment(\.modelContext) private var modelContext
    @Environment(\.dismiss) private var dismiss
    
    @Query(sort: [
        SortDescriptor(\Split.order),
        SortDescriptor(\Split.name)
    ]) private var splits: [Split]

    @State private var showingAddSheet: Bool = false

    var body: some View {
        NavigationStack {
            ScrollView {
                LazyVGrid(columns: [GridItem(.flexible()), GridItem(.flexible())], spacing: 16) {
                    ForEach(splits) { split in
                        NavigationLink {
                            SplitExercisesListView(model: split)
                        } label: {
                            VStack {
                                ZStack(alignment: .bottom) {
                                    // Golden ratio rectangle (1:1.618)
                                    RoundedRectangle(cornerRadius: 12)
                                        .fill(
                                            LinearGradient(
                                                gradient: Gradient(colors: [split.getColor(), split.getColor().darker(by: 0.2)]),
                                                startPoint: .topLeading,
                                                endPoint: .bottomTrailing
                                            )
                                        )
                                        .aspectRatio(1.618, contentMode: .fit)
                                        .shadow(radius: 2)
                                    
                                    VStack {
                                        // Icon in the center
                                        Image(systemName: split.systemImage)
                                            .font(.system(size: 40, weight: .medium))
                                            .foregroundColor(.white)
                                            .offset(y: -15)
                                        
                                        // Name at the bottom inside the rectangle
                                        Text(split.name)
                                            .font(.headline)
                                            .foregroundColor(.white)
                                            .lineLimit(1)
                                            .padding(.horizontal, 8)
                                            .padding(.bottom, 8)
                                    }
                                }
                                
                                // Exercise count below the rectangle
                                Text("\(split.exercises?.count ?? 0) exercises")
                                    .font(.caption)
                                    .foregroundColor(.secondary)
                            }
                        }
                    }
                    .onMove(perform: { indices, destination in
                        var splitArray = Array(splits)
                        splitArray.move(fromOffsets: indices, toOffset: destination)
                        for (index, split) in splitArray.enumerated() {
                            split.order = index
                        }
                        if let modelContext = splitArray.first?.modelContext {
                            do {
                                try modelContext.save()
                            } catch {
                                print("Error saving after reordering: \(error)")
                            }
                        }
                    })

                }
                .padding()
            }
            .navigationTitle("Splits")
        }
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button(action: { showingAddSheet.toggle() }) {
                    Image(systemName: "plus")
                }
            }
        }
        .sheet (isPresented: $showingAddSheet) {
            SplitAddEditView(model: Split(name: "New Split"))
        }

    }
}