/* global BLI */
if (window.__BLI_BUILDER_DEFINED__) {
  console.warn('[BLI] builder.js already loaded – skipping duplicate init');
} else {
  window.__BLI_BUILDER_DEFINED__ = true;
  console.log('[BLI] builder.js loaded');

  window.BLIBuilder = function () {
    return {
      drag: false,
      items: [],
      papers: [],
      sizes: [],
      busy: false,

      async init() {
        try {
          await Promise.all([this.loadPapers(), this.loadSizes()]);
          await this.loadDraft();
          if (!this.items.length && Number(BLI.hydrateFromCart)) {
            await this.loadFromCart();
          }
          window.addEventListener('beforeunload', () => this.saveDraftSync());
        } catch (e) {
          console.error('[BLI] init error', e);
        }
      },

      money(v) {
        if (!v) v = 0;
        const currency = (BLI && BLI.currency) ? BLI.currency : 'USD';
        return new Intl.NumberFormat(undefined, { style: 'currency', currency }).format(v);
      },
      _fd(action) {
        const f = new FormData();
        f.append('action', action);
        f.append('_wpnonce', BLI.ajaxNonce);
        return f;
      },
      _sleep(ms){ return new Promise(r=>setTimeout(r,ms)); },

      async loadPapers() {
        const res = await fetch(BLI.rest + 'papers', { headers: { 'X-WP-Nonce': (BLI.restNonce || BLI.nonce) } });
        this.papers = await res.json();
      },
      async loadSizes() {
        const res = await fetch(BLI.rest + 'sizes', { headers: { 'X-WP-Nonce': (BLI.restNonce || BLI.nonce) } });
        this.sizes = await res.json();
      },

      _dedupeIncoming(rows) {
        const seen = new Set(this.items.map(x => x.attachmentId).filter(Boolean));
        const out = [];
        for (const r of rows || []) {
          const aid = r.attachmentId || r.attachment_id;
          if (!aid || seen.has(aid)) continue;
          seen.add(aid);
          out.push(r);
        }
        return out;
      },

      async loadDraft() {
        try {
          const f = this._fd('bli_get_draft');
          const res = await fetch(BLI.ajax, { method: 'POST', body: f });
          const data = await res.json();
          const rows = (data && data.success && data.data && data.data.rows) ? data.data.rows : (data.rows || []);
          const toAdd = this._dedupeIncoming(rows);
          for (const r of toAdd) {
            const it = {
              localId: 'loc_' + Math.random().toString(36).slice(2),
              name: r.name || 'file',
              file: null,
              status: 'complete',
              progress: 100,
              attachmentId: r.attachmentId || r.attachment_id,
              thumb: r.thumb || null,
              paperId: String(r.paperId || ''),
              sizeId: String(r.sizeId || ''),
              border: r.border || 'Full Bleed',
              qty: Number(r.qty || 1),
              unit: 0
            };
            this.items.push(it);
          }
          for (const it of this.items) { if (it.paperId && it.sizeId) await this.reprice(it); }
          this.items = [...this.items];
        } catch(e) {
          console.warn('[BLI] loadDraft failed', e);
        }
      },

      async loadFromCart() {
        try {
          const f = this._fd('bli_cart_rows');
          const res = await fetch(BLI.ajax, { method: 'POST', body: f });
          const data = await res.json();
          const rows = (data && data.success && data.data && data.data.rows) ? data.data.rows : (data.rows || []);
          const toAdd = this._dedupeIncoming(rows);
          for (const r of toAdd) {
            const it = {
              localId: 'loc_' + Math.random().toString(36).slice(2),
              name: r.name || 'file',
              file: null,
              status: 'complete',
              progress: 100,
              attachmentId: r.attachmentId,
              thumb: r.thumb || null,
              paperId: String(r.paperId || ''),
              sizeId: String(r.sizeId || ''),
              border: r.border || 'Full Bleed',
              qty: Number(r.qty || 1),
              unit: 0
            };
            this.items.push(it);
          }
          for (const it of this.items) { if (it.paperId && it.sizeId) await this.reprice(it); }
          this.items = [...this.items];
        } catch(e) {
          console.warn('[BLI] loadFromCart failed', e);
        }
      },

      handleDrop(e) {
        this.drag = false;
        const files = Array.from(e.dataTransfer.files || []);
        if (files.length) this.uploadBatch(files);
      },
      handleFileChoose(e) {
        const files = Array.from(e.target.files || []);
        if (files.length) this.uploadBatch(files);
        e.target.value = '';
      },

      async uploadBatch(files) {
        for (const f of files) await this.uploadOne(f);
      },

      async uploadOne(file) {
        const maxBytes = (Number(BLI.maxSizeMB || 100)) * 1024 * 1024;
        if (file.size > maxBytes) { alert('File too large'); return; }

        const local = {
          localId: 'loc_' + Math.random().toString(36).slice(2),
          name: file.name,
          file,
          status: 'uploading',
          progress: 0,
          attachmentId: null,
          thumb: null,
          paperId: '',
          sizeId: '',
          border: 'Full Bleed',
          qty: 1,
          unit: 0
        };
        this.items.push(local);
        this.items = [...this.items];

        const fd = this._fd('bli_upload_file');
        fd.append('file', file);

        try {
          const res = await fetch(BLI.ajax, { method:'POST', body: fd });
          const data = await res.json();
          if (!data || data.success === false) throw new Error((data && data.message) || 'Upload failed');

          local.status = 'complete';
          local.progress = 100;
          local.attachmentId = data.attachment_id;
          local.thumb = data.thumb || null;
          local.name = data.name || local.name;
          this.items = [...this.items];
          this.saveDraft();
        } catch (err) {
          console.error(err);
          local.status = 'error';
          this.items = [...this.items];
        }
      },

      async reprice(it) {
        if (!it.paperId || !it.sizeId) { it.unit = 0; return; }
        const url = BLI.rest + 'price?paper_id=' + it.paperId + '&size_id=' + it.sizeId + '&border=' + encodeURIComponent(it.border || 'Full Bleed');
        const res = await fetch(url, { headers: { 'X-WP-Nonce': (BLI.restNonce || BLI.nonce) } });
        const data = await res.json();
        it.unit = parseFloat(data.price || 0);
        this.items = [...this.items];
      },

      async onChange(it){ await this.reprice(it); this.saveDraft(); },

      subtotal() {
        return this.items.reduce((s,it)=> s + (Number(it.unit||0) * Number(it.qty||0)), 0);
      },

      async remove(idx) {
        const it = this.items[idx];
        this.items.splice(idx,1);
        this.items = [...this.items];
        if (it && it.attachmentId && it.status === 'complete') {
          try {
            const f = this._fd('bli_delete_temp');
            f.append('attachment_id', it.attachmentId);
            await fetch(BLI.ajax, { method:'POST', body:f });
          } catch(e){}
        }
        this.saveDraft();
      },

      _saveTimer: null,
      saveDraft() {
        clearTimeout(this._saveTimer);
        this._saveTimer = setTimeout(()=>this.saveDraftSync(), 250);
      },
      async saveDraftSync() {
        const rows = this.items
          .filter(it => it.attachmentId)
          .map(it => ({
            attachmentId: it.attachmentId,
            thumb: it.thumb || '',
            name: it.name || '',
            paperId: Number(it.paperId || 0),
            sizeId: Number(it.sizeId || 0),
            border: it.border || 'Full Bleed',
            qty: Number(it.qty || 1)
          }));
        const f = this._fd('bli_save_draft');
        f.append('rows', JSON.stringify(rows));
        try { await fetch(BLI.ajax, { method:'POST', body:f }); } catch(e){}
      },

      async addAllToCart() {
        if (!this.items.length) return;
        try {
          this.busy = true;
          await this.saveDraftSync();

          const rows = this.items.filter(it=>it.attachmentId).map(it => ({
            file_id: it.attachmentId,
            paper_id: Number(it.paperId || 0),
            size_id: Number(it.sizeId || 0),
            border: it.border || 'Full Bleed',
            qty: Number(it.qty || 1)
          }));

          const f = this._fd('bli_add_to_cart');
          f.append('rows', JSON.stringify(rows));
          const res = await fetch(BLI.ajax, { method:'POST', body:f });
          const data = await res.json();
          if (!data || data.success === false) throw new Error((data && data.message) || 'Add to cart failed');

          try {
            const cf = this._fd('bli_clear_draft');
            await fetch(BLI.ajax, { method:'POST', body: cf });
          } catch(e){}

          window.location.href = data.cart_url;
        } catch (err) {
          alert(err.message);
        } finally {
          this.busy = false;
        }
      }
    };
  };
}
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