// Copyright (C) 2024 Rubén Beltrán del Río

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see https://map.tranquil.systems.
import Patterns
import SwiftUI

struct MapStages: View {

  let mapSize: CGSize
  let lineWidth: CGFloat
  let stages: [CGFloat]
  let opacity = 0.1

  var body: some View {
    ZStack(alignment: .topLeading) {
      PatternView(
        design: .constant(.stitch), pixelSize: 1.0, foregroundColor: .Map.stageForeground,
        backgroundColor: .Map.stageBackground
      )
      .frame(width: w(stages[0]), height: mapSize.height)
      PatternView(
        design: .constant(.shingles), pixelSize: 1.0, foregroundColor: .Map.stageForeground,
        backgroundColor: .Map.stageBackground
      )
      .offset(CGSize(width: w(stages[0]), height: 0))
      .frame(width: w(stages[1]) - w(stages[0]), height: mapSize.height)
      PatternView(
        design: .constant(.shadowGrid), pixelSize: 1.0, foregroundColor: .Map.stageForeground,
        backgroundColor: .Map.stageBackground
      )
      .offset(CGSize(width: w(stages[1]), height: 0))
      .frame(width: w(stages[2]) - w(stages[1]), height: mapSize.height)
      PatternView(
        design: .constant(.wicker), pixelSize: 1.0, foregroundColor: .Map.stageForeground,
        backgroundColor: .Map.stageBackground
      )
      .offset(CGSize(width: w(stages[2]), height: 0))
      .frame(width: mapSize.width - w(stages[2]), height: mapSize.height)

      Path { path in
        path.move(to: CGPoint(x: w(stages[0]), y: 0))
        path.addLine(to: CGPoint(x: w(stages[0]), y: mapSize.height))
        path.closeSubpath()
        path.move(to: CGPoint(x: w(stages[1]), y: 0))
        path.addLine(to: CGPoint(x: w(stages[1]), y: mapSize.height))
        path.closeSubpath()
        path.move(to: CGPoint(x: w(stages[2]), y: 0))
        path.addLine(to: CGPoint(x: w(stages[2]), y: mapSize.height))
        path.closeSubpath()
        path.move(to: CGPoint(x: w(stages[0]), y: 0))
        path.closeSubpath()
      }.strokedPath(StrokeStyle(lineWidth: lineWidth / 4, dash: [10.0, 18.0])).stroke(
        Color.Map.axisColor)
    }
  }

  func w(_ dimension: CGFloat) -> CGFloat {
    max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
  }
}

#Preview {
  MapStages(
    mapSize: CGSize(width: 200.0, height: 200.0), lineWidth: CGFloat(0.5),
    stages: [25.0, 50.0, 75.0])
}