import { useState } from 'react';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { Checkbox } from '@/components/ui/checkbox';
import { Label } from '@/components/ui/label';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import { Input } from '@/components/ui/input';
import { Switch } from '@/components/ui/switch';
import { useAppStore } from '@/stores/app-store';
import { useSettingsStore } from '@/stores/settings-store';
import { useExportSource } from '@/hooks/use-export-source';
import { generateHtml } from '@/lib/html-export';
import { ipc } from '@/lib/ipc';
import { toast } from '@/lib/toast';
import { ExportDialogFooter } from './ExportDialogFooter';

export function ExportHtmlDialog({ sourcePath }: { sourcePath: string }) {
  const closeModal = useAppStore((s) => s.closeModal);
  const { htmlHighlightStyle, renderTablesAsAscii } = useSettingsStore();
  const source = useExportSource();
  const [standalone, setStandalone] = useState(true);
  const [highlight, setHighlight] = useState(htmlHighlightStyle);
  const [ascii, setAscii] = useState(renderTablesAsAscii);
  const [selfContained, setSelfContained] = useState(false);
  const [toc, setToc] = useState(false);
  const [tocDepth, setTocDepth] = useState(3);
  const [numberSections, setNumberSections] = useState(false);
  const [cssPath, setCssPath] = useState('');
  const [submitting, setSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const handleSubmit = async () => {
    if (!source) {
      setError('No file open.');
      return;
    }
    setSubmitting(true);
    setError(null);
    try {
      const html = generateHtml({
        source: source.source,
        title: source.title,
        standalone,
        highlightStyle: highlight,
        renderTablesAsAscii: ascii,
      });

      const options = {
        standalone,
        highlightStyle: highlight,
        selfContained,
        toc,
        tocDepth,
        numberSections,
        css: cssPath || undefined,
      };

      await window.electronAPI?.export?.withOptions?.('html', options);

      const saveResult = await ipc.app.showSaveDialog?.({
        title: 'Save as HTML',
        defaultPath: source.path.replace(/\.md$/, '.html'),
      });
      if (!saveResult?.ok || !saveResult.data) {
        setSubmitting(false);
        return;
      }
      const buffer = new TextEncoder().encode(html);
      const writeResult = await ipc.file.writeBuffer({ path: saveResult.data, buffer });
      if (!writeResult.ok) {
        setError(writeResult.error.message);
        setSubmitting(false);
        return;
      }
      toast.success(`Exported ${source.title} to ${saveResult.data}`);
      closeModal();
    } catch (err) {
      const msg = err instanceof Error ? err.message : String(err);
      toast.error(`Export failed: ${msg}`);
      setError(msg);
      setSubmitting(false);
    }
  };

  return (
    <Dialog open onOpenChange={(o) => !o && closeModal()}>
      <DialogContent className="max-h-[85vh] overflow-y-auto">
        <DialogHeader>
          <DialogTitle>Export to HTML</DialogTitle>
          <DialogDescription>{sourcePath}</DialogDescription>
        </DialogHeader>
        <div className="space-y-3 text-sm">
          <label className="flex items-center gap-2">
            <Checkbox
              checked={standalone}
              onCheckedChange={(c) => setStandalone(!!c)}
              aria-label="Standalone"
            />
            Standalone document (with inline CSS)
          </label>
          <div>
            <Label htmlFor="html-highlight">Syntax highlight style</Label>
            <Select value={highlight} onValueChange={(v) => setHighlight(v as any)}>
              <SelectTrigger id="html-highlight" aria-label="Highlight style">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="github">GitHub</SelectItem>
                <SelectItem value="monokai">Monokai</SelectItem>
                <SelectItem value="nord">Nord</SelectItem>
                <SelectItem value="none">None</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="flex items-center gap-3">
            <Switch
              checked={selfContained}
              onCheckedChange={setSelfContained}
              id="html-self-contained"
            />
            <Label htmlFor="html-self-contained">Self-contained (embed all CSS inline)</Label>
          </div>
          <label className="flex items-center gap-2">
            <Checkbox
              checked={ascii}
              onCheckedChange={(c) => setAscii(!!c)}
              aria-label="ASCII tables"
            />
            Render tables as ASCII
          </label>
          <div className="flex items-center gap-3">
            <Switch checked={toc} onCheckedChange={setToc} id="html-toc" />
            <Label htmlFor="html-toc">Table of Contents</Label>
          </div>
          {toc && (
            <div className="pl-9">
              <Label htmlFor="html-toc-depth">TOC Depth</Label>
              <Input
                id="html-toc-depth"
                type="number"
                min={1}
                max={6}
                value={tocDepth}
                onChange={(e) => setTocDepth(Math.min(6, Math.max(1, Number(e.target.value))))}
                className="w-20"
                aria-label="TOC depth"
              />
            </div>
          )}
          <div className="flex items-center gap-3">
            <Switch
              checked={numberSections}
              onCheckedChange={setNumberSections}
              id="html-number-sections"
            />
            <Label htmlFor="html-number-sections">Number sections</Label>
          </div>
          <div>
            <Label htmlFor="html-css">Custom CSS file</Label>
            <Input
              id="html-css"
              value={cssPath}
              onChange={(e) => setCssPath(e.target.value)}
              placeholder="/path/to/custom.css"
              aria-label="Custom CSS file path"
            />
          </div>
          {error && (
            <div
              role="alert"
              className="rounded border border-destructive/40 bg-destructive/5 p-2 text-xs text-destructive"
            >
              {error}
            </div>
          )}
        </div>
        <ExportDialogFooter
          onCancel={closeModal}
          onSubmit={handleSubmit}
          submitting={submitting}
          submitLabel="Export"
        />
      </DialogContent>
    </Dialog>
  );
}