import { ColorTheme } from '../contexts/theme-data';

// Helper to convert hex to rgb values (e.g. "255, 255, 255")
// Accepts #RRGGBB or #RGB
const hexToRgbString = (hex: string): string => {
  // Remove #
  hex = hex.replace(/^#/, '');

  // Parse
  let r = 0,
    g = 0,
    b = 0;

  if (hex.length === 3) {
    r = parseInt(hex[0] + hex[0], 16);
    g = parseInt(hex[1] + hex[1], 16);
    b = parseInt(hex[2] + hex[2], 16);
  } else if (hex.length === 6) {
    r = parseInt(hex.substring(0, 2), 16);
    g = parseInt(hex.substring(2, 4), 16);
    b = parseInt(hex.substring(4, 6), 16);
  }

  return `${r}, ${g}, ${b}`;
};

const rgba = (hex: string, alpha: number = 1): string => {
  return `rgba(${hexToRgbString(hex)}, ${alpha})`;
};

export const generateTokensCss = (theme: ColorTheme): string => {
  const { colors } = theme;

  return `/* ============================================
   🎨 TOKENS / VARIABLES (Generated by CLI)
   ============================================ */

:root,
:root[data-theme="default"] {
  /* Brand Tokens - Source of Truth */
  --xertica-primary: ${rgba(colors.primary)};
  --xertica-dark: ${rgba(colors.sidebarDark)}; /* Approximating generic dark from sidebar dark if needed, or keeping static? */
  
  /* Semantic Colors */
  --background: rgba(255, 255, 255, 1);
  --foreground: rgba(9, 9, 11, 1);
  
  --card: rgba(255, 255, 255, 1);
  --card-foreground: rgba(9, 9, 11, 1);
  
  --popover: rgba(255, 255, 255, 1);
  --popover-foreground: rgba(9, 9, 11, 1);
  
  --primary: var(--xertica-primary);
  --primary-foreground: ${rgba(colors.primaryForeground)};
  --primary-light: ${rgba(colors.primary, 0.15)};
  --primary-light-foreground: ${rgba(colors.primary)};
  
  --secondary: rgba(244, 244, 245, 1);
  --secondary-foreground: rgba(24, 24, 27, 1);
  
  --muted: rgba(244, 244, 245, 1);
  --muted-foreground: rgba(113, 113, 122, 1);
  
  --accent: rgba(244, 244, 245, 1);
  --accent-foreground: rgba(24, 24, 27, 1);
  
  --destructive: rgba(239, 68, 68, 1);
  --destructive-foreground: rgba(250, 250, 250, 1);
  
  /* Semantic Status Colors */
  --success: rgba(5, 150, 105, 1);
  --success-foreground: rgba(250, 250, 250, 1);
  --info: rgba(37, 99, 235, 1);
  --info-foreground: rgba(250, 250, 250, 1);
  --warning: rgba(234, 179, 8, 1);
  --warning-foreground: rgba(28, 25, 23, 1);
  
  --border: rgba(228, 228, 231, 1);
  --input: rgba(244, 244, 245, 0.5);
  --input-background: rgba(244, 244, 245, 0.5);
  --ring: ${rgba(colors.primary, 0.5)}; /* Adjusted to match brand somewhat */
  
  /* Sidebar */
  --sidebar: ${rgba(colors.sidebarLight)};
  --sidebar-foreground: ${colors.sidebarLight.toLowerCase() === '#ffffff' ? 'rgba(15, 23, 42, 1)' : 'rgba(250, 250, 250, 1)'};
  --sidebar-primary: ${colors.sidebarLight.toLowerCase() === '#ffffff' ? rgba(colors.primary) : 'rgba(255, 255, 255, 1)'};
  --sidebar-primary-foreground: ${colors.sidebarLight.toLowerCase() === '#ffffff' ? rgba(colors.primaryForeground) : rgba(colors.primary)}; /* Actually if sidebar is dark, primary item usually white? */
  /* Replicating logic from Context roughly or sticking to safe defaults */
  /* Context Logic:
     if !isSidebarLight: 
        primary: #FFFFFF
        primaryFg: primary
  */
  --sidebar-accent: ${rgba(colors.sidebarLight.toLowerCase() === '#ffffff' ? colors.primary : '#FFFFFF', 0.1)};
  --sidebar-accent-foreground: ${colors.sidebarLight.toLowerCase() === '#ffffff' ? rgba(colors.primary) : '#FFFFFF'};
  --sidebar-border: rgba(255, 255, 255, 0.1); 
  --sidebar-ring: ${rgba(colors.primary, 0.5)};

  /* Charts — vibrant, accessible, harmonious palette */
  --chart-1: ${rgba(colors.chart1)};
  --chart-2: ${rgba(colors.chart2)};
  --chart-3: ${rgba(colors.chart3)};
  --chart-4: ${rgba(colors.chart4)};
  --chart-5: ${rgba(colors.chart5)};
  --chart-6: rgba(168, 85, 247, 1);  /* purple — extended palette */
  --chart-7: rgba(20, 184, 166, 1);  /* teal — extended palette */
  --chart-8: rgba(251, 113, 133, 1); /* rose — extended palette */
  
  /* Gradients */
  --gradient-diagonal: linear-gradient(135deg, ${colors.gradientStart} 0%, ${colors.gradientEnd} 100%);
  
  /* Spacing & Radius */
  --radius: 6px;
  --radius-button: 12px;
  --radius-card: 12px;
  
  --elevation-sm: 0px 0px 48px 0px rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --font-size: 16px;
  --text-h1: 2rem;
  --text-h2: 1.75rem;
  --text-h3: 1.5rem;
  --text-h4: 1.25rem;
  --text-base: 1rem;
  --text-p: 0.875rem;
  --text-label: 0.875rem;
  --text-small: 0.875rem;
  --text-xs: 0.75rem;
  --text-muted: 0.875rem;
  --text-stats: 2.25rem;
  --text-table-head: 1.25rem;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  
  /* Calendar */
  --cell-size: 2.5rem;
  --cell-radius: var(--radius);
  --calendar-caption-size: 15px;
  --calendar-weekday-size: 12px;
  --calendar-day-size: 14px;
  
  /* Toast - Success */
  --toast-success-bg: rgba(220, 252, 231, 1);
  --toast-success-border: rgba(5, 150, 105, 1);
  --toast-success-icon: rgba(5, 150, 105, 1);
  /* Toast - Warning */
  --toast-warning-bg: rgba(254, 249, 195, 1);
  --toast-warning-border: rgba(161, 98, 7, 1);
  --toast-warning-icon: rgba(161, 98, 7, 1);
  /* Toast - Info */
  --toast-info-bg: rgba(219, 234, 254, 1);
  --toast-info-border: rgba(37, 99, 235, 1);
  --toast-info-icon: rgba(37, 99, 235, 1);
  /* Toast - Error */
  --toast-error-bg: rgba(254, 226, 226, 1);
  --toast-error-border: rgba(239, 68, 68, 1);
  --toast-error-icon: rgba(239, 68, 68, 1);
}

:root[data-mode="dark"],
.dark {
  /* Brand Tokens */
  --xertica-primary: ${rgba(colors.primaryDarkMode)};
  --primary: var(--xertica-primary);
  
  /* Semantic Colors */
  --background: ${rgba(colors.darkBackground)};
  --foreground: rgba(250, 250, 250, 1);
  
  --card: ${rgba(colors.darkCard)};
  --card-foreground: rgba(250, 250, 250, 1);
  
  --popover: ${rgba(colors.darkCard)};
  --popover-foreground: rgba(250, 250, 250, 1);
  
  --primary-foreground: ${rgba(colors.primaryForegroundDark)};
  --primary-light: ${rgba(colors.primaryDarkMode, 0.15)};
  --primary-light-foreground: ${rgba(colors.primaryDarkMode)};
  
  --secondary: ${rgba(colors.darkMuted)};
  --secondary-foreground: rgba(250, 250, 250, 1);
  
  --muted: ${rgba(colors.darkMuted)};
  --muted-foreground: rgba(161, 161, 170, 1);
  
  --accent: ${rgba(colors.darkMuted)};
  --accent-foreground: rgba(250, 250, 250, 1);
  
  --destructive: rgba(239, 68, 68, 1);
  --destructive-foreground: rgba(250, 250, 250, 1);
  
  /* Semantic Status Colors */
  --success: rgba(34, 197, 94, 1);
  --success-foreground: rgba(5, 5, 5, 1);
  --info: rgba(96, 165, 250, 1);
  --info-foreground: rgba(5, 5, 5, 1);
  --warning: rgba(251, 191, 36, 1);
  --warning-foreground: rgba(5, 5, 5, 1);
  
  --border: ${rgba(colors.darkBorder)};
  --input: ${rgba(colors.darkMuted, 0.5)};
  --input-background: ${rgba(colors.darkMuted, 0.5)};
  --ring: ${rgba(colors.primaryDarkMode, 0.5)};
  
  --elevation-sm: 0px 0px 48px 0px rgba(0, 0, 0, 0.3);

  /* Charts — dark mode: slightly lighter/more saturated for contrast on dark bg */
  --chart-1: ${rgba(colors.chart1)};
  --chart-2: ${rgba(colors.chart2)};
  --chart-3: ${rgba(colors.chart3)};
  --chart-4: ${rgba(colors.chart4)};
  --chart-5: ${rgba(colors.chart5)};
  --chart-6: rgba(196, 132, 252, 1);   /* purple lighter */
  --chart-7: rgba(45, 212, 191, 1);    /* teal lighter */
  --chart-8: rgba(253, 164, 175, 1);   /* rose lighter */
  
  /* Sidebar */
  --sidebar: ${rgba(colors.sidebarDark)};
  --sidebar-foreground: rgba(250, 250, 250, 1);
  --sidebar-primary: rgba(255, 255, 255, 1);
  --sidebar-primary-foreground: ${rgba(colors.primary)};
  --sidebar-accent: rgba(255, 255, 255, 0.08);
  --sidebar-accent-foreground: rgba(250, 250, 250, 1);
  --sidebar-border: ${rgba(colors.darkBorder)};
  --sidebar-ring: ${rgba(colors.primaryDarkMode, 0.5)};
  
  /* Gradients */
  --gradient-diagonal: linear-gradient(135deg, ${colors.gradientStartDark} 0%, ${colors.gradientEndDark} 100%);
  
  /* Toast - Success */
  --toast-success-bg: rgba(6, 78, 59, 1);
  --toast-success-border: rgba(34, 197, 94, 1);
  --toast-success-icon: rgba(34, 197, 94, 1);
  /* Toast - Warning */
  --toast-warning-bg: rgba(113, 63, 18, 1);
  --toast-warning-border: rgba(251, 191, 36, 1);
  --toast-warning-icon: rgba(251, 191, 36, 1);
  /* Toast - Info */
  --toast-info-bg: rgba(30, 58, 138, 1);
  --toast-info-border: rgba(96, 165, 250, 1);
  --toast-info-icon: rgba(96, 165, 250, 1);
  /* Toast - Error */
  --toast-error-bg: rgba(127, 29, 29, 1);
  --toast-error-border: rgba(248, 113, 113, 1);
  --toast-error-icon: rgba(248, 113, 113, 1);
}
`;
};