//
//  AgentZGlyph.swift
//  Zyquo Agent
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  The in-app Agent brand glyph (wordmark + empty state): the family
//  Z-monogram whose lower stroke resolves into a command-prompt caret —
//  "the Z that acts". Drawn as vector paths on a normalized grid so it scales
//  from the 22pt wordmark to the 88pt hero without redesign. The full app
//  icon (Phase 5) shares this creative direction.
//

import SwiftUI

/// Normalized 100×100 design grid for the glyph paths.
private enum AgentGlyphGrid {
    static let unit: CGFloat = 100
}

/// The Z stroke: top bar → diagonal → shortened bottom bar (making room for
/// the caret block that follows it).
private struct AgentZStroke: Shape {
    func path(in rect: CGRect) -> Path {
        let scale = min(rect.width, rect.height) / AgentGlyphGrid.unit
        func point(_ x: CGFloat, _ y: CGFloat) -> CGPoint {
            CGPoint(x: rect.minX + x * scale, y: rect.minY + y * scale)
        }
        var path = Path()
        path.move(to: point(18, 22))
        path.addLine(to: point(82, 22))
        path.addLine(to: point(22, 78))
        path.addLine(to: point(58, 78))
        return path
    }
}

/// The command caret `›` finishing the Z's lower stroke.
private struct AgentCaretStroke: Shape {
    func path(in rect: CGRect) -> Path {
        let scale = min(rect.width, rect.height) / AgentGlyphGrid.unit
        func point(_ x: CGFloat, _ y: CGFloat) -> CGPoint {
            CGPoint(x: rect.minX + x * scale, y: rect.minY + y * scale)
        }
        var path = Path()
        path.move(to: point(70, 64))
        path.addLine(to: point(84, 78))
        path.addLine(to: point(70, 92))
        return path
    }
}

/// The Zyquo Agent glyph: violet Z monogram with a command caret.
struct AgentZGlyph: View {
    /// Rendered width and height (the glyph is square).
    var size: CGFloat
    var tint: Color = ZyquoColor.accent

    private var lineWidth: CGFloat { size * 14 / AgentGlyphGrid.unit }

    var body: some View {
        ZStack {
            AgentZStroke()
                .stroke(
                    tint,
                    style: StrokeStyle(lineWidth: lineWidth, lineCap: .round, lineJoin: .round)
                )
            AgentCaretStroke()
                .stroke(
                    tint.opacity(0.55),
                    style: StrokeStyle(lineWidth: lineWidth, lineCap: .round, lineJoin: .round)
                )
        }
        .frame(width: size, height: size)
        .accessibilityHidden(true)
    }
}