import { useState, useEffect } from "react";
import { apiGet, apiPost } from "../../lib/api";
import { ModelSelector } from "../ModelSelector";

interface Prompt {
  id: number;
  name: string;
  content: string;
  user_id: number;
  author_email?: string;
}

interface PromptEditorProps {
  promptContent: string;
  onPromptChange: (content: string) => void;
  sessionId: number;
  onRunSummary: (model: string) => void;
  isGenerating: boolean;
}

export function PromptEditor({
  promptContent,
  onPromptChange,
  sessionId,
  onRunSummary,
  isGenerating,
}: PromptEditorProps) {
  const [prompts, setPrompts] = useState<Prompt[]>([]);
  const [allPrompts, setAllPrompts] = useState<Prompt[]>([]);
  const [saveName, setSaveName] = useState("");
  const [showSave, setShowSave] = useState(false);
  const [showOthers, setShowOthers] = useState(false);
  const [saving, setSaving] = useState(false);
  const [model, setModel] = useState("gpt-5.4");

  useEffect(() => {
    loadPrompts();
  }, []);

  const loadPrompts = async () => {
    try {
      const [mine, all] = await Promise.all([
        apiGet<{ prompts: Prompt[] }>("/api/prompts"),
        apiGet<{ prompts: Prompt[] }>("/api/prompts/all"),
      ]);
      setPrompts(mine.prompts);
      setAllPrompts(all.prompts);
    } catch {}
  };

  const handleSave = async () => {
    if (!saveName.trim()) return;
    setSaving(true);
    try {
      await apiPost("/api/prompts", { name: saveName, content: promptContent });
      setSaveName("");
      setShowSave(false);
      await loadPrompts();
    } catch {}
    setSaving(false);
  };

  const handleLoadPrompt = (prompt: Prompt) => {
    onPromptChange(prompt.content);
    setShowOthers(false);
  };

  return (
    <div className="space-y-4">
      {/* Toolbar */}
      <div className="flex flex-wrap items-center gap-3">
        {/* Load own prompts */}
        {prompts.length > 0 && (
          <select
            onChange={(e) => {
              const p = prompts.find((p) => p.id === Number(e.target.value));
              if (p) onPromptChange(p.content);
            }}
            defaultValue=""
            className="input !w-auto !py-2 text-sm"
          >
            <option value="" disabled>我的提示詞...</option>
            {prompts.map((p) => (
              <option key={p.id} value={p.id}>{p.name}</option>
            ))}
          </select>
        )}

        {/* Load others' prompts */}
        <button
          onClick={() => setShowOthers(!showOthers)}
          className="btn btn-outline text-sm !py-2"
        >
          瀏覽其他人的提示詞
        </button>

        {/* Save button */}
        <button
          onClick={() => setShowSave(!showSave)}
          className="btn btn-outline text-sm !py-2"
        >
          儲存提示詞
        </button>

        {/* Model selector - right aligned */}
        <div className="ml-auto">
          <ModelSelector value={model} onChange={setModel} label="報告模型：" />
        </div>
      </div>

      {/* Others' prompts dropdown */}
      {showOthers && (
        <div className="card p-4 max-h-48 overflow-y-auto">
          <h4 className="text-sm font-semibold text-[var(--color-text-muted)] mb-2">所有提示詞</h4>
          {allPrompts.length === 0 ? (
            <p className="text-sm text-[var(--color-text-muted)]">目前沒有其他人的提示詞</p>
          ) : (
            <div className="space-y-2">
              {allPrompts.map((p) => (
                <button
                  key={p.id}
                  onClick={() => handleLoadPrompt(p)}
                  className="w-full text-left p-2 rounded-lg hover:bg-[var(--color-primary)]/10 transition-colors"
                >
                  <span className="text-sm text-[var(--color-text)]">{p.name}</span>
                  {p.author_email && (
                    <span className="text-xs text-[var(--color-text-muted)] ml-2">
                      by {p.author_email}
                    </span>
                  )}
                </button>
              ))}
            </div>
          )}
        </div>
      )}

      {/* Save prompt form */}
      {showSave && (
        <div className="card p-4 flex items-center gap-3">
          <input
            type="text"
            value={saveName}
            onChange={(e) => setSaveName(e.target.value)}
            placeholder="提示詞名稱..."
            className="input !py-2 text-sm flex-1"
          />
          <button
            onClick={handleSave}
            disabled={saving || !saveName.trim()}
            className="btn btn-primary text-sm !py-2 disabled:opacity-50"
          >
            {saving ? "..." : "儲存"}
          </button>
        </div>
      )}

      {/* Prompt textarea */}
      <textarea
        value={promptContent}
        onChange={(e) => onPromptChange(e.target.value)}
        rows={12}
        className="input !rounded-xl font-mono text-sm leading-relaxed resize-y"
        placeholder="輸入分析提示詞...使用 {questions}, {student_answers}, {teacher_answers} 作為資料佔位符"
      />

      {/* Run summary button */}
      <div className="text-center">
        <button
          onClick={() => onRunSummary(model)}
          disabled={isGenerating || !promptContent.trim()}
          className="btn btn-accent text-lg px-8 py-4 disabled:opacity-50 disabled:cursor-not-allowed"
        >
          {isGenerating ? (
            <span className="flex items-center gap-2">
              <span className="w-5 h-5 border-2 border-white border-t-transparent rounded-full animate-spin" />
              生成報告中...
            </span>
          ) : (
            "執行摘要分析 →"
          )}
        </button>
      </div>
    </div>
  );
}