//
//  CloudZGlyph.swift
//  Zyquo Cloud
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  The brand glyph as native SwiftUI drawing — the app icon's Z-command mark
//  (shared with the Zyquo family): a bold rounded Z whose lower stroke
//  resolves into a block caret. Used for the sidebar wordmark and the empty
//  state so the brand mark stays pixel-consistent without raster assets.
//
//  Icon-grid geometry (matches assets/icon/zyquo-cloud.svg):
//  Z stroke (320,310)→(704,310)→(320,700)→(556,700), width 106, round caps;
//  caret rounded rect 653…757 × 585…753 (r24).
//  Bounds incl. caps: x 267…770 (503), y 257…766 (509).
//

import SwiftUI

private enum GlyphGrid {
    static let originX: CGFloat = 267
    static let originY: CGFloat = 257
    static let width: CGFloat = 503
    static let height: CGFloat = 509
    /// height / width of the glyph's bounding box.
    static let aspect = height / width

    static func point(_ x: CGFloat, _ y: CGFloat, in rect: CGRect) -> CGPoint {
        let s = rect.width / width
        return CGPoint(x: (x - originX) * s, y: (y - originY) * s)
    }
}

/// The rounded Z stroke, lower bar shortened toward the caret.
struct ZStrokeShape: Shape {
    func path(in rect: CGRect) -> Path {
        var path = Path()
        path.move(to: GlyphGrid.point(320, 310, in: rect))
        path.addLine(to: GlyphGrid.point(704, 310, in: rect))
        path.addLine(to: GlyphGrid.point(320, 700, in: rect))
        path.addLine(to: GlyphGrid.point(556, 700, in: rect))
        return path
    }
}

/// The terminal block caret finishing the lower stroke.
struct CaretShape: Shape {
    func path(in rect: CGRect) -> Path {
        let s = rect.width / GlyphGrid.width
        var path = Path()
        path.addRoundedRect(
            in: CGRect(
                x: (653 - GlyphGrid.originX) * s, y: (585 - GlyphGrid.originY) * s,
                width: 104 * s, height: 168 * s
            ),
            cornerSize: CGSize(width: 24 * s, height: 24 * s)
        )
        return path
    }
}

/// Composite brand glyph: rounded Z + block caret, single tint.
struct CloudZGlyph: View {
    /// Rendered width; height follows the glyph's natural aspect.
    var size: CGFloat
    var tint: Color = ZyquoColor.accent

    var body: some View {
        ZStack {
            ZStrokeShape()
                .stroke(style: StrokeStyle(
                    lineWidth: size * 106 / GlyphGrid.width, lineCap: .round, lineJoin: .round
                ))
                .foregroundStyle(tint)
            CaretShape()
                .fill(tint)
        }
        .frame(width: size, height: size * GlyphGrid.aspect)
        .accessibilityHidden(true)
    }
}