import React from 'react';

import HashNavigation from '../lib/navigation.js';
import { uploadLargeFile, getAbuseReasons, submitAbuseReport, getFeedbackConfig, submitFeedback } from '../lib/im-api.js';
import { readCachedData, writeCachedData } from '../lib/use-cached-data.js';

const navigate = (view, params) => {
  let hash = HashNavigation.setUrlSidePanel(window.location.hash, view);
  Object.entries(params || {}).forEach(([key, value]) => {
    hash = value ? HashNavigation.addUrlParam(hash, key, value) : HashNavigation.removeUrlParam(hash, key);
  });
  HashNavigation.navigateTo(hash);
};

export const SECURITY_SUPPORT_VIEWS = [
  'fraud-risk-warning', 'fraud-risk-confirmation', 'abuse-report-reasons',
  'abuse-report-details', 'user-feedback'
];

function Icon({children}) { return <i className="material-icons" aria-hidden="true">{children}</i>; }

function Header({title, back}) {
  return <header className="support-header"><button type="button" onClick={() => { if (!HashNavigation.goBack()) navigate(back); }} aria-label="返回"><Icon>arrow_back_ios_new</Icon></button><h1>{title}</h1><span /></header>;
}

function Toast({message, onDone}) {
  React.useEffect(() => {
    if (!message) return undefined;
    const timer = window.setTimeout(onDone, 2200);
    return () => window.clearTimeout(timer);
  }, [message, onDone]);
  return message ? <div className="support-toast" role="status">{message}</div> : null;
}

// Backend has no "content risk scan" or "post-send fraud alert" mechanism (confirmed against
// im_be/server/im_http.go and session.go -- grepping for 诈骗/反诈/110/fraud in the whole backend
// only turns up abuse-report reason labels, no scanning logic and no system-notification event type
// for it). The two reference images (反诈弹窗（安卓）.png / 反诈弹窗（二次提示安卓）.png) show generic
// anti-fraud education content that isn't tied to any specific message or backend-driven trigger --
// there's no field anywhere (bootstrap, profile, settings) indicating "has this been shown before".
// So this is implemented as a standalone, always-reachable safety-info page (not something that
// pops up automatically), reusing the two designs' content/copy verbatim for their real interactive
// counterpart: the pre-send URL risk check below (RiskConfirmDialog), which DOES have a real backend
// (POST /security/urls/check + POST /security/risk-challenges/{id}/confirm).
function FraudAwareness({secondary}) {
  // 这里必须带上 risk-dialog：本页的 ul/li/aside/.risk-emphasis/button.primary 全部样式都挂在
  // base.css 的 .risk-dialog 下（14 条规则），而 .risk-info-page 在 base.css 里一条规则都没有——
  // 只写 risk-info-page 的话整页会渲染成带原生项目符号的裸列表。
  // 图标名也修正了：shield_lock 只存在于 Material Symbols，index.html 加载的是经典 Material Icons，
  // 那套字体里没有这个字形，会原样显示 "shield_lock" 这串文本。改用仓库已在用的 verified_user。
  return <div className="support-page risk-warning-page"><Header title="安全提醒" back={secondary ? 'fraud-risk-warning' : 'personal-center'} /><main className="risk-info-page risk-dialog">
    <span className="risk-symbol"><Icon>{secondary ? 'warning_amber' : 'verified_user'}</Icon></span>
    {secondary ? <>
      <p className="risk-emphasis">您发送的内容可能涉及诈骗风险，请注意甄别。</p>
      <p>切勿轻信陌生人的投资理财、兼职刷单、网络贷款等信息，谨防上当受骗。</p>
      <aside><Icon>phone_in_talk</Icon><span>如遇诈骗请立即拨打 110 报警。</span></aside>
    </> : <>
      <p>为保障您的账号及资金安全，请您注意：</p>
      <ul>
        <li><Icon>receipt_long</Icon>不参与刷单返利活动</li>
        <li><Icon>currency_yuan</Icon>不轻信高收益投资、理财信息</li>
        <li><Icon>person_off</Icon>不出租、出借、出售账号及实名信息</li>
        <li><Icon>lock</Icon>不向任何人泄露验证码、密码等敏感信息</li>
      </ul>
      <p className="risk-emphasis">请提高安全防范意识，谨防电信网络诈骗。</p>
    </>}
    <button type="button" className="primary" onClick={() => navigate(secondary ? 'fraud-risk-warning' : 'personal-center')}>{secondary ? '我已知晓' : '我已阅读并知晓'}</button>
  </main></div>;
}

// Exported for messages-view.jsx to render inline when composing a message that contains a URL --
// this is the one piece of Ch.11 with a genuine backend mechanism behind it (checkURL/confirmRiskChallenge,
// verified against im_http.go:1184-1285). `level`/`blocked` come straight from the checkURL response.
export function RiskConfirmDialog({level, blocked, onConfirm, onCancel}) {
  return <div className="risk-overlay"><section className="risk-dialog secondary" role="alertdialog" aria-modal="true">
    <span className="risk-symbol"><Icon>{blocked ? 'block' : 'warning_amber'}</Icon></span>
    <h2>安全提醒</h2>
    {blocked ? <p className="risk-emphasis">检测到该内容存在较高安全风险，暂无法发送。</p> : <>
      <p className="risk-emphasis">您发送的内容可能涉及诈骗风险，请注意甄别。</p>
      <p>切勿轻信陌生人的投资理财、兼职刷单、网络贷款等信息，谨防上当受骗。如遇诈骗请立即拨打 110 报警。</p>
    </>}
    {blocked
      ? <button type="button" onClick={onCancel}>我已知晓</button>
      : <><button type="button" className="danger" onClick={onConfirm}>我已知晓，继续发送</button><button type="button" onClick={onCancel}>取消发送</button></>}
  </section></div>;
}

// target_type is one of user/group/message only (verified against server/store/store.go's
// AbuseReasons validation and im_http.go's normalizeIMAbuseTarget switch -- there is no
// "group_member" variant server-side; reporting a group member uses target_type=user and simply
// loses the "which group" context, which is a real backend limitation, not something fixable here).
function ReportReasons({hashParams, onToast}) {
  const targetType = (hashParams && hashParams.target_type) || 'user';
  const targetName = (hashParams && hashParams.target_name) || '';
  const [reasons, setReasons] = React.useState(null);
  React.useEffect(() => {
    getAbuseReasons(targetType).then(data => setReasons(Array.isArray(data) ? data : (data && (data.reasons || data.items)) || []))
      .catch(err => { onToast(err.message || '加载失败'); setReasons([]); });
  }, [targetType]);
  const select = reason => navigate('abuse-report-details', {...hashParams, reason_code: reason.reason_code || reason.code, reason_label: reason.label, requires_description: reason.requires_description ? '1' : ''});
  {/* 'personal-center' made sense when contact-management-view.jsx's friend-settings page was the
      only entry point; tinode-web.jsx's handleReportTopic (block-and-report from inside a chat,
      which closes that chat before landing here) now also routes here, and for that origin
      'personal-center' is a non-sequitur -- messages-home is a reasonable default for both. */}
  return <div className="support-page"><Header title="举报" back="messages-home" /><main className="report-reasons">
    {targetName ? <section className="report-target"><Icon>account_circle</Icon><span><strong>举报{targetName}</strong><small>举报人身份不会向对方公开</small></span></section> : null}
    <h2>请选择举报原因</h2>
    {reasons === null ? <p className="report-loading">加载中…</p> : <section className="report-reason-list">
      {reasons.map(reason => <button type="button" key={reason.reason_code || reason.code} onClick={() => select(reason)}>
        <span><strong>{reason.label}</strong></span><Icon>chevron_right</Icon>
      </button>)}
    </section>}
  </main></div>;
}

function ReportDetails({hashParams, tinode, onToast}) {
  const reasonLabel = (hashParams && hashParams.reason_label) || '';
  const reasonCode = (hashParams && hashParams.reason_code) || '';
  const requiresDescription = (hashParams && hashParams.requires_description) === '1';
  const [description, setDescription] = React.useState('');
  const [evidence, setEvidence] = React.useState([]);
  const [uploading, setUploading] = React.useState(false);
  const [submitting, setSubmitting] = React.useState(false);
  const [submitted, setSubmitted] = React.useState(null);
  const fileInputRef = React.useRef(null);

  const addEvidence = event => {
    const file = event.target.files && event.target.files[0];
    event.target.value = '';
    if (!file || !tinode) return;
    if (evidence.length >= 9) { onToast('最多上传 9 个证据文件'); return; }
    setUploading(true);
    uploadLargeFile(tinode, file).then(({fileId}) => setEvidence(items => items.concat({id: fileId, name: file.name})))
      .catch(err => onToast(err.message || '上传失败')).finally(() => setUploading(false));
  };

  const submit = () => {
    if (requiresDescription && !description.trim()) { onToast('请补充问题描述'); return; }
    const target = {type: hashParams.target_type || 'user'};
    if (hashParams.target_type === 'message') { target.topic = hashParams.topic; target.seq = String(hashParams.seq); }
    else if (hashParams.target_type === 'group') { target.topic = hashParams.topic || hashParams.target_id; }
    else { target.user_id = hashParams.target_id; }
    setSubmitting(true);
    submitAbuseReport({target, reason_code: reasonCode, description: description.trim(), evidence_file_ids: evidence.map(e => e.id)})
      .then(result => setSubmitted(result))
      .catch(err => onToast(err.message || '提交失败'))
      .finally(() => setSubmitting(false));
  };

  return <div className="support-page"><Header title="举报" back="abuse-report-reasons" />
    {submitted ? <main className="support-success"><Icon>task_alt</Icon><h2>举报已受理</h2><p>我们会依据平台规则核实处理，举报人身份不会向被举报方公开。</p><dl><div><dt>受理编号</dt><dd>{submitted.report_id}</dd></div></dl><button type="button" onClick={() => navigate('messages-home')}>完成</button></main>
    : <main className="report-details">
        <section className="report-selected-reason"><span><small>举报原因</small><strong>{reasonLabel}</strong></span><button type="button" onClick={() => navigate('abuse-report-reasons', hashParams)}>修改</button></section>
        <label className="support-textarea"><span>问题描述{requiresDescription ? <b>*</b> : null}</span><textarea value={description} maxLength="500" onChange={event => setDescription(event.target.value)} placeholder="请描述具体情况、发生时间和相关行为" /><small>{description.length}/500</small></label>
        <section className="evidence-section">
          <header><span><strong>证据材料</strong><small>图片或文件，最多 9 个</small></span><em>{evidence.length}/9</em></header>
          <div>
            {evidence.map(file => <article key={file.id}><Icon>image</Icon><span>{file.name}</span><button type="button" onClick={() => setEvidence(items => items.filter(item => item.id !== file.id))} aria-label="删除证据"><Icon>close</Icon></button></article>)}
            <button type="button" className="evidence-upload" disabled={uploading} onClick={() => fileInputRef.current && fileInputRef.current.click()}><Icon>add_photo_alternate</Icon><span>{uploading ? '上传中…' : '添加证据'}</span></button>
            <input ref={fileInputRef} type="file" accept="image/*" style={{display: 'none'}} onChange={addEvidence} />
          </div>
        </section>
        <aside className="report-privacy-note"><Icon>lock</Icon><span>证据仅用于平台审核，将按照安全策略保存和访问。</span></aside>
      </main>}
    {!submitted ? <footer className="support-submit-bar"><button type="button" disabled={submitting} onClick={submit}>{submitting ? '提交中…' : '提交举报'}</button></footer> : null}
  </div>;
}

// category is REQUIRED server-side (POST /feedback rejects empty category) but the reference image
// (意见反馈.png) shows no category-selection UI at all -- picking a sensible default silently would
// mean every feedback submission gets misfiled under one bucket. A minimal category picker is added
// here (using the real categories from GET /feedback/config, not the mock's invented four-item list)
// since it's a real, meaningful, backend-required field -- same judgment call as Ch.6's "my nickname
// in this group" editor: no reference image, but a real backend capability worth a minimal UI for.
// `contact` (image has no input for it) is left unset -- it's optional server-side, so omitting it
// doesn't break the request, and adding a field the design never showed would be inventing UI.
function UserFeedback({tinode, onToast}) {
  // Fixed/parameterless config (max files, categories, max length, diagnostics notice) reached from a
  // single entry point (personal-center's "意见反馈" row) off the same hub whose own profile fetch is
  // already cached -- seeding both `config` and its derived default `category` together from the same
  // cached object avoids a flash where the category picker renders (gated on `config` alone) with
  // nothing selected yet.
  const cachedFeedbackConfig = readCachedData('feedback-config');
  const [config, setConfig] = React.useState(() => cachedFeedbackConfig || null);
  const [category, setCategory] = React.useState(() => (cachedFeedbackConfig && cachedFeedbackConfig.categories && cachedFeedbackConfig.categories[0]) || '');
  const [content, setContent] = React.useState('');
  const [images, setImages] = React.useState([]);
  const [uploading, setUploading] = React.useState(false);
  const [diagnostics, setDiagnostics] = React.useState(false);
  const [submitting, setSubmitting] = React.useState(false);
  const [submitted, setSubmitted] = React.useState(null);
  const fileInputRef = React.useRef(null);
  const maxFiles = (config && config.attachment_policy && config.attachment_policy.max_files) || 5;
  const maxLength = (config && config.max_length) || 300;

  React.useEffect(() => {
    getFeedbackConfig().then(data => {
      writeCachedData('feedback-config', data);
      setConfig(data); setCategory((data.categories && data.categories[0]) || 'other');
    }).catch(() => {});
  }, []);

  const CATEGORY_LABELS = {bug: '功能异常', suggestion: '产品建议', complaint: '服务投诉', other: '其他'};

  const addImage = event => {
    const file = event.target.files && event.target.files[0];
    event.target.value = '';
    if (!file || !tinode) return;
    if (images.length >= maxFiles) { onToast(`最多上传 ${maxFiles} 张图片`); return; }
    setUploading(true);
    uploadLargeFile(tinode, file).then(({fileId}) => setImages(items => items.concat({id: fileId})))
      .catch(err => onToast(err.message || '上传失败')).finally(() => setUploading(false));
  };

  const submit = () => {
    if (!content.trim()) { onToast('请填写反馈内容'); return; }
    // category is a required backend field (empty string 400s as MALFORMED_REQUEST) but the picker
    // that sets it only renders once `config` has loaded -- if getFeedbackConfig() is still in
    // flight or failed, `category` can still be '' here while content/submit stay visible the whole
    // time, so this needs its own explicit guard rather than relying on the picker having run.
    if (!category) { onToast('请选择反馈类型'); return; }
    setSubmitting(true);
    submitFeedback({category, content: content.trim(), attachment_file_ids: images.map(i => i.id), include_diagnostics: diagnostics})
      .then(result => setSubmitted(result))
      .catch(err => onToast(err.message || '提交失败'))
      .finally(() => setSubmitting(false));
  };

  if (submitted) return <div className="support-page"><Header title="意见反馈" back="personal-center" /><main className="support-success"><Icon>mark_email_read</Icon><h2>反馈已受理</h2><p>感谢你的反馈，我们会尽快查看并用于改进产品。</p><dl><div><dt>反馈编号</dt><dd>{submitted.feedback_id}</dd></div></dl><button type="button" onClick={() => navigate('personal-center')}>返回我的</button></main></div>;

  return <div className="support-page feedback-page"><Header title="意见反馈" back="personal-center" /><main>
    {config && config.categories && config.categories.length > 1 ? <section className="feedback-categories"><h2>反馈类型</h2><div>
      {config.categories.map(id => <button type="button" className={category === id ? 'active' : ''} key={id} onClick={() => setCategory(id)}>{CATEGORY_LABELS[id] || id}</button>)}
    </div></section> : null}
    <label className="support-textarea">
      <span>问题反馈<b>*</b></span>
      <textarea value={content} maxLength={maxLength} onChange={event => setContent(event.target.value)} placeholder="为了更好的帮您解决问题，请在提交问题时上传截图信息，方便我们更快速的帮助您解决问题。" />
      <small>{content.length}/{maxLength}</small>
    </label>
    <section className="feedback-upload">
      <header><span><strong>图片</strong></span><em>{images.length}/{maxFiles}</em></header>
      <button type="button" disabled={uploading} onClick={() => fileInputRef.current && fileInputRef.current.click()}><Icon>add_a_photo</Icon><span>{uploading ? '上传中…' : '点击上传'}</span></button>
      <input ref={fileInputRef} type="file" accept="image/*" style={{display: 'none'}} onChange={addImage} />
    </section>
    {config && config.diagnostics_notice ? <label className="diagnostics-consent"><input type="checkbox" checked={diagnostics} onChange={event => setDiagnostics(event.target.checked)} /><span><strong>同意上传脱敏诊断信息</strong><small>{config.diagnostics_notice}</small></span></label> : null}
  </main><footer className="support-submit-bar"><button type="button" disabled={submitting} onClick={submit}>{submitting ? '提交中…' : '提交'}</button></footer></div>;
}

export default function SecuritySupportView({view, hashParams, tinode}) {
  const [toast, setToast] = React.useState('');
  let content;
  if (view === 'fraud-risk-warning' || view === 'fraud-risk-confirmation') content = <FraudAwareness secondary={view === 'fraud-risk-confirmation'} />;
  else if (view === 'abuse-report-reasons') content = <ReportReasons hashParams={hashParams} onToast={setToast} />;
  else if (view === 'abuse-report-details') content = <ReportDetails hashParams={hashParams} tinode={tinode} onToast={setToast} />;
  else content = <UserFeedback tinode={tinode} onToast={setToast} />;
  return <>{content}<Toast message={toast} onDone={() => setToast('')} /></>;
}