//
//  CVResumeAppearance.swift
//  App for Indeed
//
//  Shared résumé colours for gallery thumbnails and filled CV preview/export.
//  Tracks app light / dark mode so the selected template looks the same everywhere.
//

import AppKit

@MainActor
enum CVResumeAppearance {

    struct Colors {
        let paper: NSColor
        let ink: NSColor
        let muted: NSColor
        let rule: NSColor
        let cardBackground: NSColor
        let sidebarTint: NSColor
        let accentRed: NSColor
        let accentBlue: NSColor
    }

    static var isDark: Bool { AppAppearanceManager.shared.isDark }

    static func colors(isDark dark: Bool? = nil) -> Colors {
        let dark = dark ?? isDark
        if dark {
            return Colors(
                paper: NSColor(srgbRed: 28 / 255, green: 30 / 255, blue: 36 / 255, alpha: 1),
                ink: NSColor(srgbRed: 0.94, green: 0.95, blue: 0.97, alpha: 1),
                muted: NSColor(srgbRed: 0.62, green: 0.66, blue: 0.72, alpha: 1),
                rule: NSColor(srgbRed: 0.38, green: 0.40, blue: 0.46, alpha: 1),
                cardBackground: NSColor(srgbRed: 32 / 255, green: 34 / 255, blue: 40 / 255, alpha: 1),
                sidebarTint: NSColor(srgbRed: 40 / 255, green: 42 / 255, blue: 48 / 255, alpha: 1),
                accentRed: NSColor(srgbRed: 235 / 255, green: 88 / 255, blue: 72 / 255, alpha: 1),
                accentBlue: AppDashboardTheme.brandBlue
            )
        }
        return Colors(
            paper: NSColor.white,
            ink: NSColor(srgbRed: 38 / 255, green: 50 / 255, blue: 71 / 255, alpha: 1),
            muted: NSColor(srgbRed: 110 / 255, green: 118 / 255, blue: 132 / 255, alpha: 1),
            rule: NSColor(srgbRed: 228 / 255, green: 232 / 255, blue: 240 / 255, alpha: 1),
            cardBackground: NSColor.white,
            sidebarTint: AppDashboardTheme.cvMakerPreviewSidebarTint,
            accentRed: NSColor(srgbRed: 207 / 255, green: 67 / 255, blue: 50 / 255, alpha: 1),
            accentBlue: AppDashboardTheme.brandBlue
        )
    }

    /// Slight paper tint by layout variant (gallery + filled CV use the same rule).
    static func paperBackground(variant: Int, base: NSColor) -> NSColor {
        guard !isDark else { return base }
        switch variant % 5 {
        case 0: return base
        case 1: return NSColor(srgbRed: 0.995, green: 0.992, blue: 0.985, alpha: 1)
        case 2: return NSColor(srgbRed: 0.96, green: 0.99, blue: 1, alpha: 1)
        case 3: return NSColor(srgbRed: 0.99, green: 0.99, blue: 0.99, alpha: 1)
        default: return NSColor(srgbRed: 0.99, green: 0.98, blue: 0.995, alpha: 1)
        }
    }

    static func accentColor(for template: CVTemplate) -> NSColor {
        let palette = colors()
        switch template.accent {
        case .redUnderline, .redBar:
            return palette.accentRed
        case .blueBar:
            return template.themeColor
        case .none:
            return template.themeColor.blended(withFraction: 0.5, of: palette.ink) ?? template.themeColor
        }
    }

    static func sectionHeadingColor(for template: CVTemplate) -> NSColor {
        accentColor(for: template)
    }
}