import React from 'react';
import {
  ChevronLeft,
  Printer,
  Loader2,
  Database,
  Link2,
  Download,
} from 'lucide-react';
import {
  ImportData,
  LabelTemplate,
  RecordRow,
  ExportRangeConfig,
  PaperConfig,
  CutLineConfig,
} from '../types';
import { isVariableMappingConfigured } from '../utils';
import { DataImporter, downloadDataTemplate } from './DataImporter';
import { VariableMappingPanel } from './VariableMappingPanel';
import { MobileExportPropsPanel } from './MobileExportPropsPanel';
import { DataRangeFields } from './DataRangeFields';

interface MobileExportViewProps {
  template: LabelTemplate;
  templateName: string;
  templateVariables: string[];
  importData: ImportData | null;
  onDataLoaded: (data: ImportData) => void;
  onClear: () => void;
  dataColumns: string[];
  variableColumnMapping: Record<string, string>;
  onChangeMapping: (mapping: Record<string, string>) => void;
  paper: PaperConfig;
  onChangePaper: (paper: PaperConfig) => void;
  rows: RecordRow[];
  draftExportRange: ExportRangeConfig;
  onChangeDraftExportRange: (range: ExportRangeConfig) => void;
  cutLine: CutLineConfig;
  onChangeCutLine: (cutLine: CutLineConfig) => void;
  selectedCount: number;
  totalPages: number;
  pdfGenerating: boolean;
  onBack: () => void;
  onExportPdf: () => void;
}

export const MobileExportView: React.FC<MobileExportViewProps> = ({
  template,
  templateName,
  templateVariables,
  importData,
  onDataLoaded,
  onClear,
  dataColumns,
  variableColumnMapping,
  onChangeMapping,
  paper,
  onChangePaper,
  rows,
  draftExportRange,
  onChangeDraftExportRange,
  cutLine,
  onChangeCutLine,
  selectedCount,
  totalPages,
  pdfGenerating,
  onBack,
  onExportPdf,
}) => {
  const hasData = rows.length > 0;
  const mappedCount = templateVariables.filter((v) =>
    isVariableMappingConfigured(variableColumnMapping, v, dataColumns)
  ).length;
  const needsMapping = templateVariables.length > 0;
  const mappingComplete = !needsMapping || (hasData && mappedCount === templateVariables.length);

  const exportBlockedReason = !hasData
    ? '请先上传 Excel 数据'
    : !mappingComplete
      ? `还有 ${templateVariables.length - mappedCount} 个变量未关联`
      : selectedCount === 0
        ? '当前数据范围内无标签'
        : null;

  return (
    <div className="mobile-export-view">
      <header className="no-print bg-slate-950 border-b border-slate-900 shrink-0 shadow mobile-export-header mobile-template-header px-4 py-3">
        <div className="flex items-center gap-2 min-w-0 w-full">
          <button
            type="button"
            onClick={onBack}
            className="mobile-export-back"
            aria-label="返回"
          >
            <ChevronLeft className="w-5 h-5" />
          </button>
          <div className="flex items-center gap-3 min-w-0 flex-1">
            <div className="min-w-0">
              {/* <h1 className="text-sm font-bold tracking-wider flex items-center gap-2 text-slate-100 uppercase">
                <span className="truncate">批量标签排版印刷生成器</span>
              </h1> */}
              <p className="text-sm font-bold tracking-wider flex items-center gap-2 text-slate-100 uppercase" title={templateName}>
                {templateName}
              </p>
            </div>
          </div>
        </div>
      </header>

      <main className="mobile-export-content">
        <section className="mobile-export-card">
          <div className="mobile-export-card-head">
            <Database className="w-4 h-4 text-indigo-500 shrink-0" />
            <div className="flex-1 min-w-0">
              <div className="flex items-start justify-between gap-2">
                <div className="min-w-0">
                  <h2>数据源</h2>
                  <p>{hasData ? '已上传，可设置数据范围' : '上传 Excel 或 CSV 文件'}</p>
                </div>
                <button
                  type="button"
                  onClick={() => downloadDataTemplate(templateName, templateVariables)}
                  className="mobile-export-icon-btn"
                  aria-label="下载数据模板"
                >
                  <Download className="w-5 h-5" />
                </button>
              </div>
            </div>
          </div>
          <div className="mobile-export-card-body space-y-5">
            <DataImporter
              variant="mobile"
              importData={importData}
              onDataLoaded={onDataLoaded}
              onClear={onClear}
              templateName={templateName}
              templateVariables={templateVariables}
            />
            {hasData && (
              <DataRangeFields
                variant="mobile"
                exportRange={draftExportRange}
                onChangeExportRange={onChangeDraftExportRange}
                rows={rows}
                paper={paper}
                template={template}
              />
            )}
          </div>
        </section>

        {hasData && (
          <section className="mobile-export-card">
            <div className="mobile-export-card-head">
              <Link2 className="w-4 h-4 text-indigo-500 shrink-0" />
              <div className="flex-1 min-w-0">
                <h2>关联变量</h2>
                <p>
                  {needsMapping
                    ? `已关联 ${mappedCount}/${templateVariables.length}`
                    : '此模板无需变量映射'}
                </p>
              </div>
            </div>
            <div className="mobile-export-card-body">
              <VariableMappingPanel
                variant="mobile"
                variables={templateVariables}
                columns={dataColumns}
                mapping={variableColumnMapping}
                onChangeMapping={onChangeMapping}
                variableDefaults={template.variableDefaults}
              />
            </div>
          </section>
        )}

        <MobileExportPropsPanel
          template={template}
          paper={paper}
          onChangePaper={onChangePaper}
          rows={rows}
          exportRange={draftExportRange}
          cutLine={cutLine}
          onChangeCutLine={onChangeCutLine}
          locked={!hasData}
        />
      </main>

      <footer className="mobile-export-footer">
        {exportBlockedReason && !pdfGenerating && (
          <p className="mobile-export-footer-hint">{exportBlockedReason}</p>
        )}
        <button
          type="button"
          onClick={onExportPdf}
          disabled={!!exportBlockedReason || pdfGenerating}
          className="mobile-export-submit"
        >
          {pdfGenerating ? (
            <>
              <Loader2 className="w-5 h-5 animate-spin shrink-0" />
              PDF 生成中
            </>
          ) : (
            <>
              <Printer className="w-5 h-5 shrink-0" />
              {exportBlockedReason
                ? '生成标签PDF文件'
                : `生成标签PDF文件（${selectedCount} 枚 · ${totalPages} 页）`}
            </>
          )}
        </button>
      </footer>
    </div>
  );
};