// modules/admin/components/courses/AchievementsBuilder.jsx
// The "Achievements" sub-section of the Rewards step: pick an existing
// achievement from the registry or define a new one — same New/Attach
// pattern as RoadmapBuilder's Units section. A course carries at most one
// achievement.

import { useState } from "react";
import * as LucideIcons from "lucide-react";
import { Plus, Link2, Trophy, BadgeCheck, Trash2 } from "lucide-react";

import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import AttachAchievementDialog from "./AttachAchievementDialog";
import CreateAchievementDialog from "./CreateAchievementDialog";

export default function AchievementsBuilder({ achievementKeys, onAchievementKeysChange, registry, onRegistryChange }) {
  const [attachOpen, setAttachOpen] = useState(false);
  const [createOpen, setCreateOpen] = useState(false);

  const selected = registry.find((a) => a.key === achievementKeys[0]) ?? null;

  const handleAttach = (key) => onAchievementKeysChange([key]);

  const handleCreated = (achievement) => {
    onRegistryChange([...registry, achievement]);
    onAchievementKeysChange([achievement.key]);
  };

  const declineAchievement = () => {
    onAchievementKeysChange([]);
  };

  return (
    <div className="border-t pt-4">
      <div className="flex items-start justify-between gap-3 pb-3 mb-3 border-b">
        <div className="space-y-0.5">
          <h2 className="text-sm font-semibold">Achievements</h2>
          <p className="text-xs text-muted-foreground">
            Attach an existing achievement from the registry, or define a new one from scratch.
          </p>
        </div>
        <div className="flex items-center gap-2 shrink-0">

          <Button type="button" variant="outline" size="sm" onClick={() => setAttachOpen(true)}>
            <Link2 /> Select
          </Button>
          <Button type="button" variant="outline" size="sm" onClick={() => setCreateOpen(true)}>
            <Plus /> Create
          </Button>
        </div>
      </div>

      {!selected ? (
        <div className="flex flex-col items-center justify-center gap-2 py-8 text-center">
          <Trophy className="h-7 w-7 text-muted-foreground" />
          <p className="text-sm font-medium">No achievement selected</p>
          <Button type="button" variant="ghost" size="sm" className="text-muted-foreground" onClick={declineAchievement}>
            Actually, skip achievements
          </Button>
        </div>
      ) : (
        <div className="rounded-md border px-3 py-2.5 flex items-center gap-3">
          {(() => {
            const Icon = LucideIcons[selected.icon] ?? Trophy;
            return <Icon className="h-4 w-4 text-muted-foreground shrink-0" />;
          })()}
          <div className="flex-1 min-w-0">
            <p className="text-sm font-medium truncate">{selected.label}</p>
            {selected.description && (
              <p className="text-xs text-muted-foreground truncate">{selected.description}</p>
            )}
          </div>
          <Badge variant="outline" className="text-[10px] shrink-0 capitalize gap-1">
            {selected.type === "badge" ? <Trophy className="h-2.5 w-2.5" /> : <BadgeCheck className="h-2.5 w-2.5" />}
            {selected.type}
          </Badge>
          <Button
            type="button"
            variant="ghost"
            size="icon"
            className="text-muted-foreground hover:text-destructive shrink-0 h-7 w-7"
            onClick={() => onAchievementKeysChange([])}
          >
            <Trash2 className="h-4 w-4" />
          </Button>
        </div>
      )}

      <AttachAchievementDialog
        open={attachOpen}
        onOpenChange={setAttachOpen}
        registry={registry}
        selectedKey={achievementKeys[0] ?? null}
        onAttach={handleAttach}
      />
      <CreateAchievementDialog
        open={createOpen}
        onOpenChange={setCreateOpen}
        onCreated={handleCreated}
      />
    </div>
  );
}