"use client";

import { useMemo, useId } from "react";
import {
  Terminal,
  Smartphone,
  Globe,
  Code,
  LayoutDashboard,
  MessageSquare,
  Cloud,
  Wrench,
  Cpu,
  Shield,
  Boxes,
  type LucideIcon,
} from "lucide-react";

interface ProjectThumbnailProps {
  title: string;
  category?: string;
  tags?: string[];
  slug?: string;
  size?: "card" | "hero";
}

// Plakatflächen statt Pastellverläufe: jede Kategorie bekommt eine feste Ton-Kombination
// aus den Plakat-Tokens. Tinte/Papier tauschen im Dark Mode von selbst die Rollen.
const tones = {
  signal: "bg-signal text-ink",
  ink: "bg-ink text-paper",
  paper: "bg-paper-2 text-ink",
  ok: "bg-ok text-ink",
} as const;

const categoryThemes: Record<
  string,
  {
    icon: LucideIcon;
    tone: keyof typeof tones;
    pattern: "dots" | "grid" | "diagonal" | "circuit" | "waves" | "terminal";
  }
> = {
  "Web Development": { icon: Code, tone: "signal", pattern: "circuit" },
  "Mobile Development": { icon: Smartphone, tone: "ink", pattern: "waves" },
  "Web Application": { icon: Globe, tone: "paper", pattern: "dots" },
  "Backend Development": { icon: Cpu, tone: "ink", pattern: "grid" },
  "Full-Stack Development": { icon: Boxes, tone: "signal", pattern: "grid" },
  DevOps: { icon: Shield, tone: "ok", pattern: "diagonal" },
  default: { icon: Wrench, tone: "paper", pattern: "dots" },
};

const slugIcons: Record<string, LucideIcon> = {
  "kernel-panic-404-interactive-terminal": Terminal,
  "portfolio-website": LayoutDashboard,
  "real-time-chat-application": MessageSquare,
  "weather-forecast-app": Cloud,
  "clarity": Smartphone,
  "e-commerce-platform-api": Boxes,
  "task-management-dashboard": LayoutDashboard,
};

function PatternOverlay({ pattern, id }: { pattern: string; id: string }) {
  const patterns: Record<string, React.ReactNode> = {
    dots: (
      <svg className="absolute inset-0 w-full h-full opacity-[0.14]" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <pattern id={`pat-dots-${id}`} x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse">
            <circle cx="2" cy="2" r="1.5" fill="currentColor" />
          </pattern>
        </defs>
        <rect width="100%" height="100%" fill={`url(#pat-dots-${id})`} />
      </svg>
    ),
    grid: (
      <svg className="absolute inset-0 w-full h-full opacity-[0.14]" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <pattern id={`pat-grid-${id}`} x="0" y="0" width="40" height="40" patternUnits="userSpaceOnUse">
            <path d="M 40 0 L 0 0 0 40" fill="none" stroke="currentColor" strokeWidth="1" />
          </pattern>
        </defs>
        <rect width="100%" height="100%" fill={`url(#pat-grid-${id})`} />
      </svg>
    ),
    diagonal: (
      <svg className="absolute inset-0 w-full h-full opacity-[0.14]" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <pattern id={`pat-diag-${id}`} x="0" y="0" width="24" height="24" patternUnits="userSpaceOnUse">
            <line x1="0" y1="24" x2="24" y2="0" stroke="currentColor" strokeWidth="1" />
          </pattern>
        </defs>
        <rect width="100%" height="100%" fill={`url(#pat-diag-${id})`} />
      </svg>
    ),
    circuit: (
      <svg className="absolute inset-0 w-full h-full opacity-[0.14]" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <pattern id={`pat-circ-${id}`} x="0" y="0" width="60" height="60" patternUnits="userSpaceOnUse">
            <path d="M0 30h20m20 0h20M30 0v20m0 20v20" stroke="currentColor" strokeWidth="0.8" fill="none" />
            <circle cx="30" cy="30" r="3" fill="currentColor" />
            <circle cx="10" cy="30" r="2" fill="currentColor" />
            <circle cx="50" cy="30" r="2" fill="currentColor" />
            <circle cx="30" cy="10" r="2" fill="currentColor" />
            <circle cx="30" cy="50" r="2" fill="currentColor" />
          </pattern>
        </defs>
        <rect width="100%" height="100%" fill={`url(#pat-circ-${id})`} />
      </svg>
    ),
    waves: (
      <svg className="absolute inset-0 w-full h-full opacity-[0.14]" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <pattern id={`pat-wave-${id}`} x="0" y="0" width="100" height="20" patternUnits="userSpaceOnUse">
            <path d="M0 10 Q25 0 50 10 T100 10" fill="none" stroke="currentColor" strokeWidth="1" />
          </pattern>
        </defs>
        <rect width="100%" height="100%" fill={`url(#pat-wave-${id})`} />
      </svg>
    ),
    terminal: (
      <svg className="absolute inset-0 w-full h-full opacity-[0.14]" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <pattern id={`pat-term-${id}`} x="0" y="0" width="200" height="30" patternUnits="userSpaceOnUse">
            <text x="4" y="18" fontFamily="monospace" fontSize="10" fill="currentColor">$_</text>
            <text x="50" y="18" fontFamily="monospace" fontSize="10" fill="currentColor" opacity="0.4">&#x2502;</text>
            <text x="70" y="18" fontFamily="monospace" fontSize="10" fill="currentColor" opacity="0.6">404</text>
            <text x="110" y="18" fontFamily="monospace" fontSize="10" fill="currentColor" opacity="0.4">&#x2502;</text>
            <text x="130" y="18" fontFamily="monospace" fontSize="10" fill="currentColor" opacity="0.3">ERR</text>
          </pattern>
        </defs>
        <rect width="100%" height="100%" fill={`url(#pat-term-${id})`} />
      </svg>
    ),
  };

  return patterns[pattern] || patterns.dots;
}

export default function ProjectThumbnail({
  title,
  category,
  tags,
  slug,
  size = "card",
}: ProjectThumbnailProps) {
  const uniqueId = useId();
  const theme = useMemo(() => {
    if (slug && slugIcons[slug]) {
      const matchedTheme = categoryThemes[category || ""] || categoryThemes.default;
      return { ...matchedTheme, icon: slugIcons[slug] };
    }
    return categoryThemes[category || ""] || categoryThemes.default;
  }, [category, slug]);

  const Icon = theme.icon;
  const isHero = size === "hero";
  const displayTags = tags?.slice(0, isHero ? 5 : 3) ?? [];

  return (
    <div className={`absolute inset-0 flex flex-col justify-between ${tones[theme.tone]} ${isHero ? "p-5 sm:p-8" : "p-4 sm:p-5"}`}>
      <PatternOverlay pattern={theme.pattern} id={uniqueId} />

      <div className="relative z-10 flex items-start justify-between gap-3">
        <span className="font-mono text-xs leading-snug sm:text-[13px]">{displayTags.join(" · ")}</span>
        <span
          className={`flex shrink-0 items-center justify-center rounded-full shadow-[inset_0_0_0_2px_currentColor] ${isHero ? "h-14 w-14 sm:h-16 sm:w-16" : "h-10 w-10"}`}
        >
          <Icon className={isHero ? "h-7 w-7 sm:h-8 sm:w-8" : "h-5 w-5"} strokeWidth={1.75} />
        </span>
      </div>

      <span
        className={`relative z-10 font-display font-extrabold leading-[0.86] tracking-[-0.045em] [overflow-wrap:anywhere] [font-variation-settings:'wdth'_78] ${
          isHero ? "text-[clamp(2.6rem,8vw,7rem)]" : "text-[clamp(1.8rem,4vw,2.8rem)]"
        }`}
      >
        {title}
      </span>
    </div>
  );
}