"use client";

import { useEffect, useRef, useState } from "react";
import { motion, AnimatePresence } from "framer-motion";
import type { ImageModelInfo } from "@/lib/types";
import { fetchModels } from "@/lib/api";
import { slideUp } from "@/components/ui/motion-presets";

import { getStoreUserId } from "@/lib/store";

function getModelStorageKey() {
  const uid = getStoreUserId() || "_anonymous";
  return `epeekit-${uid}-selected-image-model`;
}

interface ModelSelectorProps {
  value: string;
  onChange: (modelId: string) => void;
}

export function ModelSelector({ value, onChange }: ModelSelectorProps) {
  const [models, setModels] = useState<ImageModelInfo[]>([]);
  const [open, setOpen] = useState(false);
  const containerRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    fetchModels()
      .then(({ models: list, default: defaultId }) => {
        setModels(list);
        const saved = localStorage.getItem(getModelStorageKey());
        const validIds = new Set(list.map((m) => m.id));
        if (saved && validIds.has(saved)) {
          onChange(saved);
        } else if (!value || !validIds.has(value)) {
          onChange(defaultId);
        }
      })
      .catch(() => {});
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  useEffect(() => {
    if (!open) return;
    const handler = (e: MouseEvent) => {
      if (containerRef.current && !containerRef.current.contains(e.target as Node)) {
        setOpen(false);
      }
    };
    document.addEventListener("mousedown", handler);
    return () => document.removeEventListener("mousedown", handler);
  }, [open]);

  const selected = models.find((m) => m.id === value);

  if (models.length === 0) return null;

  return (
    <div ref={containerRef} className="relative">
      <button
        type="button"
        onClick={() => setOpen(!open)}
        className="flex items-center gap-1.5 px-2.5 py-1.5 rounded-xl text-xs
                   border border-[var(--border)] bg-[var(--bg-tertiary)]
                   text-[var(--text-secondary)] hover:text-[var(--accent)]
                   hover:border-[var(--accent)]/40 hover:bg-[var(--accent)]/5
                   transition-all cursor-pointer btn-hover-lift"
        title="切换生图模型"
      >
        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
          <path d="M12 2L2 7l10 5 10-5-10-5z" />
          <path d="M2 17l10 5 10-5" />
          <path d="M2 12l10 5 10-5" />
        </svg>
        <span className="max-w-[100px] truncate">{selected?.name ?? "模型"}</span>
        <svg
          width="10" height="10" viewBox="0 0 24 24" fill="none"
          stroke="currentColor" strokeWidth="2.5"
          className={`transition-transform ${open ? "rotate-180" : ""}`}
        >
          <polyline points="6 9 12 15 18 9" />
        </svg>
      </button>

      <AnimatePresence>
        {open && (
          <motion.div
            variants={slideUp}
            initial="hidden"
            animate="visible"
            exit={{ opacity: 0, y: 4, transition: { duration: 0.1 } }}
            className="absolute bottom-full left-0 mb-1.5 w-56 rounded-xl
                        surface-3 overflow-hidden z-50"
          >
            {models.map((m) => {
              const isActive = m.id === value;
              return (
                <button
                  key={m.id}
                  onClick={() => {
                    onChange(m.id);
                    localStorage.setItem(getModelStorageKey(), m.id);
                    setOpen(false);
                  }}
                  className={`w-full text-left px-3.5 py-2.5 flex flex-col gap-0.5
                              transition-all cursor-pointer
                              ${isActive
                                ? "bg-[var(--accent)]/8 text-[var(--accent)]"
                                : "text-[var(--text-primary)] hover:bg-[var(--bg-tertiary)]"
                              }`}
                >
                  <span className="text-sm font-medium flex items-center gap-1.5">
                    {m.name}
                    {m.supports_ref_image && (
                      <span className="typo-micro px-1.5 py-0.5 rounded-full
                                       bg-[var(--accent)]/10 text-[var(--accent)] leading-none
                                       border border-[var(--accent)]/20"
                            style={{ textTransform: "none", fontSize: "10px" }}>
                        参考图
                      </span>
                    )}
                    {isActive && (
                      <svg width="12" height="12" viewBox="0 0 24 24" fill="currentColor">
                        <path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z" />
                      </svg>
                    )}
                  </span>
                  <span className="typo-caption">{m.description}</span>
                </button>
              );
            })}
          </motion.div>
        )}
      </AnimatePresence>
    </div>
  );
}