(function () {
  'use strict';

  if (window.__DBC_COLLABORATION_LOOP_V7301__) return;
  window.__DBC_COLLABORATION_LOOP_V7301__ = true;

  const root = document.documentElement;
  const body = document.body;
  const form = document.querySelector('form[data-v7301-collaboration-form]');
  const query = new URLSearchParams(window.location.search);

  const sampleTopics = Object.freeze({
    'pha-barrier-emulsion': {
      kind: 'material-sample',
      selectionZh: '博碳阻隔乳液',
      selectionEn: 'BIOTEN barrier emulsion',
      provider: 'dbc',
      domain: '',
    },
    'waterborne-coated-paper': {
      kind: 'coated-paper-sample',
      selectionZh: '博碳水涂纸',
      selectionEn: 'BIOTEN waterborne-coated paper',
      provider: 'partner-coater',
      domain: '',
    },
    'bioten-foodserviceware': {
      kind: 'finished-article-sample',
      selectionZh: '博碳餐饮具',
      selectionEn: 'BIOTEN foodserviceware',
      provider: 'partner-converter',
      domain: 'food-beverage',
    },
    'paper-cup-sample': {
      kind: 'finished-article-sample',
      selectionZh: '纸杯',
      selectionEn: 'Paper cups',
      provider: 'partner-converter',
      domain: 'food-beverage',
    },
    'paper-box-sample': {
      kind: 'finished-article-sample',
      selectionZh: '纸盒',
      selectionEn: 'Paper cartons',
      provider: 'partner-converter',
      domain: '',
    },
    'paper-bag-sample': {
      kind: 'finished-article-sample',
      selectionZh: '纸袋等制品',
      selectionEn: 'Paper bags and related articles',
      provider: 'partner-converter',
      domain: '',
    },
    'other-sample': {
      kind: 'other-sample',
      selectionZh: '其他纸基包装样品',
      selectionEn: 'Other fiber-based packaging sample',
      provider: 'to-be-confirmed',
      domain: '',
    },
  });

  const allowedDomains = new Set([
    'packaging',
    'food-beverage',
    'beauty-care',
    'medical-outer',
    'special-performance',
  ]);
  const allowedPartnerRoles = new Set([
    'paper-mill',
    'coater',
    'printer-converter',
    'foodserviceware-producer',
    'brand-owner',
    'test-evidence',
  ]);
  const allowedRoutes = new Set([
    '',
    'plus',
    'pro',
    'ultra',
    'co-development',
    'paper-mill',
    'coater',
    'printer-converter',
    'foodserviceware-producer',
    'brand-owner',
    'test-evidence',
  ]);
  const allowedTopics = new Set([
    ...Object.keys(sampleTopics),
    'coating-converting-partnership',
    'developer-intake',
    'project-intake',
    'bioten-plus-balanced-matte',
    'hotel-amenity-paper-pouch',
    'film-free-carton',
    'film-continuity',
    'methods-evidence',
    'method-evidence',
  ]);
  const knownSources = new Set([
    '',
    'dbc-home-packaging-entry',
    'packaging-home-sample',
    'packaging-product-release',
    'packaging-home-final',
    'packaging-footer',
    'DEV-PKG',
  ]);

  function language() {
    return root.dataset.lang === 'en' || root.lang === 'en' ? 'en' : 'zh';
  }

  function sourceIsAllowed(value) {
    return knownSources.has(value) || /^[A-Z]{2,8}-\d{3}$/.test(value);
  }

  function safeValue(name, allowed) {
    const value = String(query.get(name) || '').trim();
    return allowed(value) ? value : '';
  }

  const context = {
    domain: safeValue('domain', (value) => allowedDomains.has(value)),
    topic: safeValue('topic', (value) => allowedTopics.has(value)),
    route: safeValue('route', (value) => allowedRoutes.has(value)),
    source: safeValue('source', sourceIsAllowed),
    releaseId: safeValue('release_id', (value) => value === '' || /^[A-Z]{2,8}-\d{3}$/.test(value)),
  };

  const isPartnership = context.topic === 'coating-converting-partnership'
    || context.source === 'packaging-product-release';
  const initialSample = sampleTopics[context.topic] || null;
  const intentKind = isPartnership ? 'partnership-request' : (initialSample ? 'sample-request' : 'project-intake');

  function ensureHidden(name, value) {
    if (!form) return null;
    let input = form.querySelector(`input[name="${name}"]`);
    if (!input) {
      input = document.createElement('input');
      input.type = 'hidden';
      input.name = name;
      form.prepend(input);
    }
    input.value = value || '';
    return input;
  }

  function configureContract() {
    if (!form) return;
    form.dataset.requestRecipient = language() === 'en' ? 'the BIOTEN Packaging team' : '博碳包装项目团队';
    form.dataset.resetStatus = language() === 'en'
      ? 'After submission, the information enters manual completeness and fit review.'
      : '提交后，信息进入人工完整性与项目适配评审。';

    ensureHidden('intent_kind', intentKind);
    ensureHidden('domain', context.domain);
    ensureHidden('topic', context.topic);
    ensureHidden('route', context.route);
    ensureHidden('source', context.source || 'packaging-direct');
    ensureHidden('release_id', context.releaseId || (/^[A-Z]{2,8}-\d{3}$/.test(context.source) ? context.source : ''));
    ensureHidden('sample_kind', initialSample ? initialSample.kind : '');
    ensureHidden('provider_role', initialSample ? initialSample.provider : '');

    const formId = form.querySelector('input[name="form_id"]');
    if (formId) {
      formId.value = isPartnership
        ? 'bioten-partnership-request'
        : (initialSample ? 'bioten-packaging-sample-request' : 'bioten-general-request');
    }
  }

  function ensurePackagingSystemOption(select) {
    if (!select || Array.from(select.options).some((option) => option.value === 'packaging-system')) return;
    const option = document.createElement('option');
    option.value = 'packaging-system';
    option.dataset.zh = '跨领域纸基包装 / 产业协作';
    option.dataset.en = 'Cross-field fiber packaging / industrial collaboration';
    option.textContent = language() === 'en' ? option.dataset.en : option.dataset.zh;
    select.appendChild(option);
  }

  function setCheck(name, value, checked) {
    if (!form) return;
    const input = form.querySelector(`input[name="${name}"][value="${value}"]`);
    if (input) input.checked = checked;
  }

  function configureVisibleForm() {
    if (!form) return;
    const sampleSelection = form.querySelector('input[name="sample_selection"]');
    const domainSelect = form.querySelector('select[name="packaging_domain"]');
    const application = form.querySelector('input[name="application"]');
    const message = form.querySelector('textarea[name="message"]');
    const partnershipFields = form.querySelector('[data-v7301-partnership-fields]');
    const partnerInputs = partnershipFields ? Array.from(partnershipFields.querySelectorAll('input, select, textarea')) : [];
    const sampleResponsibility = document.querySelector('[data-v7301-sample-responsibility]');

    ensurePackagingSystemOption(domainSelect);

    if (initialSample) {
      setCheck('request_need', '样品/纸样测试', true);
      if (sampleSelection && !sampleSelection.value) {
        sampleSelection.value = `${initialSample.selectionZh} / ${initialSample.selectionEn}`;
      }
      const intendedDomain = context.domain === 'packaging' ? '' : (context.domain || initialSample.domain);
      if (domainSelect && intendedDomain) domainSelect.value = intendedDomain;
    }

    if (isPartnership) {
      setCheck('request_need', '商务合作/报价咨询', true);
      if (domainSelect) domainSelect.value = context.domain && context.domain !== 'packaging' ? context.domain : 'packaging-system';
      if (application && !application.value) {
        application.value = '产业伙伴能力与协作 / Industrial partner capability and collaboration';
      }
      if (message && !message.value) {
        message.value = language() === 'en'
          ? 'We would like to assess a BIOTEN Packaging prototyping, converting, validation, or market collaboration route.'
          : '希望评估博碳包装的打样、加工、联合验证或市场协作路径。';
      }
    }

    if (partnershipFields) partnershipFields.hidden = !isPartnership;
    if (sampleResponsibility) {
      sampleResponsibility.hidden = isPartnership;
      sampleResponsibility.setAttribute('aria-hidden', String(isPartnership));
    }
    partnerInputs.forEach((input) => {
      input.disabled = !isPartnership;
      if (input.matches('[data-v7301-partner-required]')) input.required = isPartnership;
    });

    if (isPartnership && allowedPartnerRoles.has(context.route)) {
      const partnerRole = form.querySelector('select[name="partner_role"]');
      if (partnerRole) partnerRole.value = context.route;
    }
  }

  function friendlyContext() {
    if (!form) return;
    const box = document.querySelector('[data-bp7140-intake-context]');
    const output = box && box.querySelector('[data-bp7140-context-value]');
    if (!box || !output) return;

    const sourceMap = {
      'dbc-home-packaging-entry': ['首页 · 包装协作入口', 'Homepage · Packaging collaboration'],
      'packaging-home-sample': ['博碳包装 · 样品入口', 'BIOTEN Packaging · Sample entry'],
      'packaging-product-release': ['新应用发布 · 合作入口', 'Application releases · Partnership entry'],
      'packaging-home-final': ['博碳包装 · 项目入口', 'BIOTEN Packaging · Project entry'],
      'packaging-footer': ['博碳包装 · 页脚入口', 'BIOTEN Packaging · Footer entry'],
      'DEV-PKG': ['包装开发者 · 工程入口', 'Packaging Developer · Engineering entry'],
    };
    const topicMap = {
      'pha-barrier-emulsion': ['博碳阻隔乳液', 'BIOTEN barrier emulsion'],
      'waterborne-coated-paper': ['博碳水涂纸', 'BIOTEN waterborne-coated paper'],
      'bioten-foodserviceware': ['博碳餐饮具', 'BIOTEN foodserviceware'],
      'other-sample': ['其他纸基包装样品', 'Other fiber-based packaging sample'],
      'coating-converting-partnership': ['产业伙伴合作申请', 'Industrial partnership application'],
      'developer-intake': ['包装工程问题', 'Packaging engineering problem'],
      'project-intake': ['包装项目预审', 'Packaging project intake'],
      'bioten-plus-balanced-matte': ['Bioten Plus 博碳平衡型应用', 'Bioten Plus balanced application'],
      'hotel-amenity-paper-pouch': ['酒店用品纸基包装研究命题', 'Hotel amenity paper-packaging brief'],
      'film-free-carton': ['美妆纸盒工程命题', 'Beauty-carton engineering brief'],
      'film-continuity': ['涂层连续成膜工程命题', 'Coating film-continuity brief'],
    };
    const zh = [];
    const en = [];
    if (topicMap[context.topic]) {
      zh.push(topicMap[context.topic][0]);
      en.push(topicMap[context.topic][1]);
    }
    if (/^[A-Z]{2,8}-\d{3}$/.test(context.source)) {
      zh.push(`发布编号 ${context.source}`);
      en.push(`Release ${context.source}`);
    } else if (sourceMap[context.source]) {
      zh.push(sourceMap[context.source][0]);
      en.push(sourceMap[context.source][1]);
    }
    if (!zh.length) {
      box.hidden = true;
      output.textContent = '';
      delete output.dataset.zh;
      delete output.dataset.en;
      return;
    }
    box.hidden = false;
    output.dataset.zh = zh.join(' · ');
    output.dataset.en = en.join(' · ');
    output.textContent = language() === 'en' ? output.dataset.en : output.dataset.zh;
  }

  function applyDynamicLanguage() {
    document.querySelectorAll('[data-placeholder-zh]').forEach((element) => {
      element.placeholder = language() === 'en'
        ? (element.dataset.placeholderEn || '')
        : (element.dataset.placeholderZh || '');
    });
    const introTitle = document.getElementById('paper-sample-title');
    const introCopy = document.querySelector('[data-v7301-intake-intro]');
    if (introTitle) {
      introTitle.textContent = isPartnership
        ? (language() === 'en' ? 'Define partner capabilities before joint assessment' : '先说明合作能力，再进入共同评估')
        : (initialSample
          ? (language() === 'en' ? 'Confirm the sample object, then add real project conditions' : '先确认样品对象，再补充真实项目条件')
          : (language() === 'en' ? 'Organize real project conditions through seven engineering steps' : '按七步工程链整理真实项目条件'));
    }
    if (introCopy) {
      introCopy.textContent = isPartnership
        ? (language() === 'en'
          ? 'Capability information supports manual fit review and defines the collaboration role, sample or line task, validation scope and next interface.'
          : '能力信息将用于人工适配评审，便于明确协作角色、样品或产线任务、验证范围与下一步接口。')
        : (language() === 'en'
          ? 'The selected object, provider role, paper, coating, converting, use conditions, and evidence requirements are reviewed together.'
          : '所选对象、提供方角色、纸张、涂层、加工、使用工况与证据要求将被一起评审。');
    }
    configurePartnershipSurface();
    friendlyContext();
  }

  function setRuntimeText(element, zh, en) {
    if (!element) return;
    element.dataset.zh = zh;
    element.dataset.en = en;
    element.textContent = language() === 'en' ? en : zh;
  }

  function configurePartnershipSurface() {
    if (!isPartnership) return;

    const hero = document.querySelector('.request-hero');
    const kicker = hero?.querySelector('.request-kicker');
    const heading = hero?.querySelector('h1');
    const descriptor = hero?.querySelector('.about-hero-title > span');
    const lead = hero?.querySelector('.about-hero-title > p');
    const action = hero?.querySelector('.request-hero-actions a');
    setRuntimeText(kicker, 'BIOTEN PACKAGING · 产业合作申请', 'BIOTEN PACKAGING · PARTNERSHIP INTAKE');
    setRuntimeText(heading, '博碳包装产业合作申请', 'BIOTEN Packaging Partnership Application');
    setRuntimeText(descriptor, 'PAPER · COATING · CONVERTING · FORMING · EVIDENCE', 'PAPER · COATING · CONVERTING · FORMING · EVIDENCE');
    setRuntimeText(
      lead,
      '面向纸厂、涂布、印刷、模切、制盒、制袋、成型、品牌与检测伙伴，提交真实设备、工艺窗口、服务区域与协作方向，进入能力匹配与联合验证评审。',
      'For paper, coating, printing, die cutting, carton or bag making, forming, brand and testing partners: submit real equipment, process windows, service regions and collaboration directions for capability matching and joint-validation review.'
    );
    setRuntimeText(action, '填写合作能力 ↓', 'Describe capabilities ↓');

    const currentContext = document.querySelector('.bp7140-context [aria-current="page"]');
    setRuntimeText(currentContext, '合作申请', 'Partnership application');

    const pathIntro = document.querySelector('.v281-path__intro');
    setRuntimeText(pathIntro?.querySelector('span'), 'PARTNERSHIP INTAKE', 'PARTNERSHIP INTAKE');
    setRuntimeText(pathIntro?.querySelector('strong'), '把产线能力整理成可评审的协作输入', 'Structure production capabilities for collaboration review');

    const pathSteps = Array.from(document.querySelectorAll('.v281-path__copy'));
    const stepCopy = [
      ['能力范围', '角色、设备、工艺与区域', 'Capability scope', 'Role, equipment, process and region'],
      ['当前申请', '提交能力与协作方向', 'Current application', 'Submit capabilities and direction'],
      ['联合评估', '匹配任务、版本与方法', 'Joint assessment', 'Match tasks, versions and methods'],
      ['合作回执', '确认接口与下一步任务', 'Partnership response', 'Confirm interface and next task'],
    ];
    pathSteps.forEach((step, index) => {
      const copy = stepCopy[index];
      if (!copy) return;
      setRuntimeText(step.querySelector('strong'), copy[0], copy[2]);
      setRuntimeText(step.querySelector('small'), copy[1], copy[3]);
    });

    document.title = language() === 'en'
      ? 'BIOTEN Packaging Partnership Application | Industrial Collaboration'
      : '博碳包装产业合作申请｜纸基包装产业协同';
  }

  function configureSampleChoices() {
    if (!form) return;
    document.querySelectorAll('[data-v7301-sample-choice]').forEach((link) => {
      link.addEventListener('click', (event) => {
        const topic = link.dataset.v7301SampleChoice;
        const sample = sampleTopics[topic];
        if (!sample) return;
        event.preventDefault();
        const sampleSelection = form.querySelector('input[name="sample_selection"]');
        const domainSelect = form.querySelector('select[name="packaging_domain"]');
        ensureHidden('intent_kind', 'sample-request');
        ensureHidden('topic', topic);
        ensureHidden('sample_kind', sample.kind);
        ensureHidden('provider_role', sample.provider);
        const formId = form.querySelector('input[name="form_id"]');
        if (formId) formId.value = 'bioten-packaging-sample-request';
        if (sampleSelection) sampleSelection.value = `${sample.selectionZh} / ${sample.selectionEn}`;
        // A new sample object owns its domain state. Clear the previous domain
        // when the selected object has no prescribed domain so stale routing is
        // never carried into the authoritative form contract.
        if (domainSelect) domainSelect.value = sample.domain || '';
        setCheck('request_need', '样品/纸样测试', true);
        document.querySelectorAll('[data-v7301-sample-choice]').forEach((item) => item.removeAttribute('aria-current'));
        link.setAttribute('aria-current', 'true');
        const next = new URL(window.location.href);
        next.searchParams.set('topic', topic);
        if (!next.searchParams.get('source')) next.searchParams.set('source', 'packaging-direct');
        window.history.replaceState({}, '', next);
        document.getElementById('paper-sample-title')?.scrollIntoView({ behavior: root.matches('[data-reduced-motion]') ? 'auto' : 'smooth', block: 'start' });
      });
      if (link.dataset.v7301SampleChoice === context.topic) link.setAttribute('aria-current', 'true');
    });
  }

  if (body) body.dataset.v7301CollaborationMode = intentKind;
  configureContract();
  configureVisibleForm();
  configureSampleChoices();
  applyDynamicLanguage();

  document.addEventListener('dbc:languagechange', applyDynamicLanguage);
  const observer = new MutationObserver(() => applyDynamicLanguage());
  observer.observe(root, { attributes: true, attributeFilter: ['data-lang', 'lang'] });
}());