'use client';

import React, { useState, useEffect } from 'react';
import styled from 'styled-components';
import CodeEditor from '@/components/admin/CodeEditor';
import { adminFetch } from '@/lib/adminFetch';

const SISTERS = ['harang', 'narang', 'darang', 'erang'];
const FILES = ['SOUL.md', 'AGENTS.md', 'TOOLS.md', 'PROTOCOL.md', 'HEARTBEAT.md'];

const DISPLAY_NAMES: Record<string, string> = {
  harang: '🦊 하랑이', narang: '🦊 나랑이', darang: '🐱 다랑이', erang: '🐺 이랑이',
};

const Layout = styled.div`
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 20px;
`;

const FileTree = styled.div`
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
`;

const TreeSection = styled.div`
  border-bottom: 1px solid var(--border-color);
  padding: 6px;
  &:last-child { border-bottom: none; }
`;

const TreeLabel = styled.div`
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 6px 8px 4px;
`;

const TreeItem = styled.button<{ $active: boolean }>`
  width: 100%;
  text-align: left;
  padding: 6px 10px;
  font-size: 12px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  background: ${({ $active }) => $active ? 'rgba(88,166,255,0.12)' : 'transparent'};
  color: ${({ $active }) => $active ? '#58A6FF' : 'var(--text-secondary)'};
  transition: background 0.15s;

  &:hover { background: rgba(240,246,252,0.06); color: var(--text-primary); }
`;

const EditorPane = styled.div`
  display: flex;
  flex-direction: column;
  gap: 12px;
`;

const Toolbar = styled.div`
  display: flex;
  align-items: center;
  gap: 10px;
`;

const PathLabel = styled.span`
  font-size: 13px;
  color: var(--text-secondary);
  font-family: monospace;
  flex: 1;
`;

const Btn = styled.button<{ $primary?: boolean; $danger?: boolean }>`
  padding: 7px 16px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid;
  transition: all 0.15s;
  disabled: ${({ disabled }) => disabled ? 'not-allowed' : 'pointer'};

  ${({ $primary }) =>
    $primary &&
    `background: rgba(88,166,255,0.12); border-color: rgba(88,166,255,0.4); color: #58A6FF;
     &:hover { background: rgba(88,166,255,0.22); }`}
  ${({ $danger }) =>
    $danger &&
    `background: transparent; border-color: rgba(240,246,252,0.15); color: #8B949E;
     &:hover { color: #E6EDF3; }`}
  ${({ $primary, $danger }) =>
    !$primary && !$danger &&
    `background: transparent; border-color: rgba(240,246,252,0.15); color: #8B949E;
     &:hover { color: #E6EDF3; }`}
`;

const ResultMsg = styled.div<{ $success: boolean }>`
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-family: monospace;
  background: ${({ $success }) => $success ? 'rgba(0,230,118,0.08)' : 'rgba(255,23,68,0.08)'};
  color: ${({ $success }) => $success ? '#00FF00' : '#FF1744'};
  border: 1px solid ${({ $success }) => $success ? 'rgba(0,230,118,0.3)' : 'rgba(255,23,68,0.3)'};
`;

export default function HarnessPage() {
  const [selected, setSelected] = useState({ sister: 'narang', file: 'SOUL.md' });
  const [content, setContent] = useState('');
  const [saved, setSaved] = useState('');
  const [loading, setLoading] = useState(false);
  const [saving, setSaving] = useState(false);
  const [result, setResult] = useState<{ success: boolean; msg: string } | null>(null);

  useEffect(() => {
    setContent('');
    setSaved('');
    setResult(null);
    setLoading(true);
    adminFetch(`/api/admin/harness/${selected.sister}/${selected.file}`)
      .then((r) => r.json())
      .then((d) => { setContent(d.content ?? ''); setSaved(d.content ?? ''); })
      .catch(() => setContent('(로드 실패)'))
      .finally(() => setLoading(false));
  }, [selected.sister, selected.file]);

  const handleSave = async () => {
    setSaving(true);
    setResult(null);
    try {
      const res = await adminFetch(`/api/admin/harness/${selected.sister}/${selected.file}`, {
        method: 'PUT',
        body: JSON.stringify({ content }),
      });
      if (res.status === 401) {
        setResult({ success: false, msg: '인증 실패 — API Key 또는 JWT 토큰을 확인해' });
        return;
      }
      if (!res.ok) {
        const text = await res.text();
        setResult({ success: false, msg: `서버 오류 ${res.status}: ${text.slice(0, 100)}` });
        return;
      }
      const d = await res.json();
      if (d.success) {
        setSaved(content);
        setResult({ success: true, msg: '저장 완료' });
      } else {
        setResult({ success: false, msg: d.error ?? '저장 실패' });
      }
    } catch (e) {
      setResult({ success: false, msg: (e as Error).message });
    } finally {
      setSaving(false);
    }
  };

  const isDirty = content !== saved;

  return (
    <Layout>
      <FileTree>
        {SISTERS.map((s) => (
          <TreeSection key={s}>
            <TreeLabel>{DISPLAY_NAMES[s] ?? s}</TreeLabel>
            {FILES.map((f) => (
              <TreeItem
                key={f}
                $active={selected.sister === s && selected.file === f}
                onClick={() => setSelected({ sister: s, file: f })}
              >
                {f}
              </TreeItem>
            ))}
          </TreeSection>
        ))}
      </FileTree>

      <EditorPane>
        <Toolbar>
          <PathLabel>
            ~/.openclaw/workspace/{selected.file} ({DISPLAY_NAMES[selected.sister]})
          </PathLabel>
          {isDirty && (
            <span style={{ fontSize: '11px', color: '#FF9800' }}>● 변경됨</span>
          )}
          <Btn onClick={() => { setContent(saved); setResult(null); }} $danger>되돌리기</Btn>
          <Btn $primary onClick={handleSave} disabled={!isDirty || saving}>
            {saving ? '저장 중...' : '💾 저장'}
          </Btn>
        </Toolbar>

        {result && <ResultMsg $success={result.success}>{result.msg}</ResultMsg>}

        {loading ? (
          <div style={{ padding: '32px', textAlign: 'center', color: 'var(--text-secondary)', fontSize: '13px' }}>
            로딩 중...
          </div>
        ) : (
          <CodeEditor value={content} onChange={setContent} />
        )}
      </EditorPane>
    </Layout>
  );
}