import { useEffect, useState } from "react";
import { Link, useLocation } from "react-router-dom";
import { useQueryClient } from "@tanstack/react-query";
import { useAI } from "../context/AIContext";
import { fetchSkillsForRoute, type AISkill } from "../lib/ai-skills";
import { AI_PROVIDER_META, type AIProviderId } from "../lib/ai";
import { api } from "../lib/api";
import { extractAllStrategyBlocks } from "../lib/strategyImport";
import MarkdownMessage from "./MarkdownMessage";
import PixelMascot from "./PixelMascot";

export default function GuideMascot() {
  const loc = useLocation();
  const ai = useAI();
  const qc = useQueryClient();
  const [skills, setSkills] = useState<AISkill[]>([]);
  const [importing, setImporting] = useState<string | null>(null);

  useEffect(() => {
    void ai.refreshStatus();
  }, []);

  useEffect(() => {
    if (ai.open) void ai.refreshStatus();
  }, [ai.open]);

  useEffect(() => {
    void fetchSkillsForRoute(loc.pathname, ai.focus || undefined).then(setSkills);
  }, [loc.pathname, ai.focus?.cardTitle, ai.focus?.label, ai.open]);

  return (
    <div className={"guide-dock" + (ai.open ? " open" : "")}>
      {ai.open && (
        <div className="guide-panel" role="dialog" aria-label="AI 導覽員">
          <div className="guide-panel-head">
            <PixelMascot size={44} variant="chat" />
            <div>
              <div className="guide-name">金幣貓頭鷹</div>
              <div className="guide-ctx small muted">{ai.contextLabel}</div>
            </div>
            <button type="button" className="guide-close" onClick={ai.closeAI} aria-label="關閉">
              ×
            </button>
          </div>

          {!ai.status?.ready && (
            <div className="guide-setup">
              <p>尚未設定 AI。請到設定頁填入 <b>Grok</b> 或 <b>OpenCode Go</b> API Key。</p>
              <Link to="/settings" className="guide-setup-link" onClick={ai.closeAI}>
                前往 AI 設定 →
              </Link>
            </div>
          )}

          <div className="guide-toolbar">
            <label className="guide-field">
              <span>Provider</span>
              <select
                value={ai.provider}
                onChange={(e) => ai.setProvider(e.target.value as AIProviderId)}
              >
                {(ai.status?.providers || []).map((p) => (
                  <option key={p.id} value={p.id} disabled={!p.hasKey}>
                    {AI_PROVIDER_META[p.id as AIProviderId]?.label || p.id}
                    {!p.hasKey ? "（未設定）" : ""}
                  </option>
                ))}
                {!ai.status?.providers?.length &&
                  Object.entries(AI_PROVIDER_META).map(([id, m]) => (
                    <option key={id} value={id}>
                      {m.label}
                    </option>
                  ))}
              </select>
            </label>
            <button type="button" className="guide-clear" onClick={ai.clearChat}>
              清除
            </button>
          </div>

          <div className="guide-chat">
            {ai.messages.map((msg) => {
              const blocks = msg.role === "assistant" ? extractAllStrategyBlocks(msg.text) : [];
              return (
                <div key={msg.id} className={"guide-msg " + msg.role}>
                  {msg.role === "assistant" && <PixelMascot size={32} variant="chat" />}
                  <div className="guide-bubble-wrap">
                    <div className="guide-bubble">
                      <MarkdownMessage text={msg.text} />
                    </div>
                    {blocks.map((b, i) => (
                      <button
                        key={`${msg.id}-bt-${i}`}
                        type="button"
                        className="guide-strategy-import"
                        disabled={importing != null}
                        onClick={() => {
                          setImporting(`${msg.id}-${i}`);
                          void api
                            .createStrategy({
                              name: b.name,
                              engine: b.engine,
                              params: b.params || {},
                              description: b.description,
                              formula: b.formula,
                              source: b.source || "owl",
                              tags: b.tags || ["貓頭鷹"],
                            })
                            .then(() => qc.invalidateQueries({ queryKey: ["strategies"] }))
                            .finally(() => setImporting(null));
                        }}
                      >
                        {importing === `${msg.id}-${i}` ? "加入中…" : `＋ 加入策略庫：${b.name}`}
                      </button>
                    ))}
                    {msg.meta && <div className="guide-meta small muted">{msg.meta}</div>}
                  </div>
                </div>
              );
            })}
          </div>

          {skills.length > 0 && (
            <div className="guide-skills">
              <div className="guide-skills-k">技能快捷</div>
              <div className="guide-skill-row">
                {skills.map((s) => (
                  <button
                    key={s.id}
                    type="button"
                    className="guide-skill"
                    disabled={ai.busy}
                    onClick={() => void ai.sendMessage(s.prompt, ai.focus, s.id)}
                  >
                    {s.label}
                  </button>
                ))}
              </div>
            </div>
          )}

          <div className="guide-compose">
            <textarea
              rows={1}
              value={ai.draft}
              placeholder="問導覽員…（Enter 送出）"
              onChange={(e) => ai.setDraft(e.target.value)}
              onKeyDown={(e) => {
                if (e.key === "Enter" && !e.shiftKey && !e.nativeEvent.isComposing) {
                  e.preventDefault();
                  void ai.sendMessage();
                }
              }}
            />
            <button type="button" className="guide-send" disabled={ai.busy} onClick={() => void ai.sendMessage()}>
              ↑
            </button>
          </div>
        </div>
      )}

      <button
        type="button"
        className="guide-fab"
        aria-label="開啟 AI 導覽員"
        onClick={() => ai.openAI()}
      >
        <PixelMascot size={58} blink={!ai.open} variant="fab" />
        <span className="guide-fab-label">問</span>
      </button>
    </div>
  );
}