"use client";

import { useState } from "react";
import { createSkillAction, updateSkillAction } from "./actions";
import { useRouter } from "@/i18n/routing";
import { Loader2, ArrowLeft, Save, PlusCircle } from "lucide-react";

const CATEGORIES = [
  { value: "backend", label: "Enterprise Backend" },
  { value: "infra", label: "Database & Infrastructure" },
  { value: "frontend", label: "Frontend Development" },
  { value: "mobile", label: "Mobile Development" },
];

const DEVICON_SUGGESTIONS = [
  "java", "spring", "oracle", "docker", "postgresql", "redis", "kubernetes",
  "react", "nextjs", "typescript", "tailwindcss", "angular", "flutter", "swift",
  "kafka", "nginx", "jenkins", "github",
];

export function SkillForm({ initialData, skillId }: { initialData?: any; skillId?: string }) {
  const router = useRouter();
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [iconPreview, setIconPreview] = useState(initialData?.iconName || "");

  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault();
    setError(null);
    setLoading(true);

    const formData = new FormData(e.currentTarget);
    let result;
    if (skillId) {
      result = await updateSkillAction(skillId, null, formData);
    } else {
      result = await createSkillAction(null, formData);
    }

    if (!result.success) {
      setError(result.message || "An error occurred");
      setLoading(false);
    } else {
      router.push("/admin/dashboard/skills");
      router.refresh();
    }
  }

  return (
    <div className="max-w-2xl mx-auto p-6 lg:p-10 rounded-3xl bg-card border border-border shadow-sm relative overflow-hidden">
      <div className="absolute top-0 inset-x-0 h-1 bg-gradient-to-r from-emerald-500 to-teal-500" />

      <div className="mb-8 flex items-center gap-4">
        <button
          type="button"
          onClick={() => router.back()}
          className="p-2 rounded-full hover:bg-muted text-muted-foreground transition-colors"
        >
          <ArrowLeft size={20} />
        </button>
        <div>
          <h1 className="text-2xl font-bold tracking-tight">
            {skillId ? "Edit Skill" : "Add New Skill"}
          </h1>
          <p className="text-sm text-muted-foreground">
            {skillId ? "Update tech stack item" : "Add a new technology to your arsenal"}
          </p>
        </div>
      </div>

      <form onSubmit={handleSubmit} className="space-y-6">
        {error && (
          <div className="p-4 rounded-xl bg-red-500/10 border border-red-500/20 text-red-500 text-sm font-medium">
            {error}
          </div>
        )}

        <div className="space-y-2">
          <label className="text-sm font-semibold">Skill Name</label>
          <input
            name="name"
            required
            defaultValue={initialData?.name}
            placeholder="e.g. Spring Boot"
            className="w-full px-4 py-3 rounded-xl bg-muted/30 border border-border text-sm focus:outline-none focus:ring-2 focus:ring-emerald-500/50 transition-all font-mono"
          />
        </div>

        <div className="space-y-2">
          <label className="text-sm font-semibold">Category</label>
          <select
            name="category"
            required
            defaultValue={initialData?.category || "backend"}
            className="w-full px-4 py-3 rounded-xl bg-muted/30 border border-border text-sm focus:outline-none focus:ring-2 focus:ring-emerald-500/50 transition-all cursor-pointer"
          >
            {CATEGORIES.map((cat) => (
              <option key={cat.value} value={cat.value}>
                {cat.label}
              </option>
            ))}
          </select>
        </div>

        <div className="space-y-3">
          <label className="text-sm font-semibold">
            Devicon Slug <span className="text-muted-foreground font-normal">(opsional — untuk ikon di Hero)</span>
          </label>
          <input
            name="iconName"
            defaultValue={initialData?.iconName || ""}
            placeholder="e.g. spring, java, docker"
            onChange={(e) => setIconPreview(e.target.value.trim())}
            className="w-full px-4 py-3 rounded-xl bg-muted/30 border border-border text-sm focus:outline-none focus:ring-2 focus:ring-emerald-500/50 transition-all font-mono"
          />
          {/* Icon Preview */}
          {iconPreview && (
            <div className="flex items-center gap-3 p-3 rounded-xl border border-border bg-muted/20">
              <img
                src={`https://cdn.jsdelivr.net/gh/devicons/devicon@latest/icons/${iconPreview}/${iconPreview}-original.svg`}
                alt={iconPreview}
                className="w-10 h-10 object-contain"
                onError={(e) => { (e.target as HTMLImageElement).style.display = 'none'; }}
              />
              <span className="text-xs text-muted-foreground font-mono">{iconPreview}</span>
            </div>
          )}
          {/* Quick suggestions */}
          <div className="flex flex-wrap gap-2">
            {DEVICON_SUGGESTIONS.map((s) => (
              <button
                key={s}
                type="button"
                onClick={() => {
                  setIconPreview(s);
                  const input = document.querySelector('input[name="iconName"]') as HTMLInputElement;
                  if (input) input.value = s;
                }}
                className="px-2 py-1 text-[11px] font-mono rounded-lg bg-muted/50 border border-border hover:border-emerald-500/50 hover:bg-emerald-500/10 transition-colors"
              >
                {s}
              </button>
            ))}
          </div>
        </div>

        <div className="pt-6 border-t border-border/50 flex justify-end">
          <button
            type="submit"
            disabled={loading}
            className="flex items-center gap-2 px-8 py-3 rounded-xl bg-foreground text-background font-semibold text-sm hover:opacity-90 transition-all disabled:opacity-50 hover:scale-[1.02] shadow-md"
          >
            {loading ? (
              <Loader2 size={18} className="animate-spin" />
            ) : skillId ? (
              <><Save size={18} /> Update Skill</>
            ) : (
              <><PlusCircle size={18} /> Save Skill</>
            )}
          </button>
        </div>
      </form>
    </div>
  );
}