import React, { useState } from 'react';
import { Save } from 'lucide-react';
import { PanelShell, Label, Field, HelperText } from '../panels/PanelShell';
import { staticMicrositeApi, type MicrositeV2Template } from '../../../services/api';

const inputStyle: React.CSSProperties = {
  width: '100%',
  padding: '8px 10px',
  borderRadius: 'var(--radius-button)',
  border: '1px solid var(--border)',
  background: 'var(--input-background)',
  color: 'var(--foreground)',
  fontSize: 'var(--text-sm)',
  boxSizing: 'border-box',
};

export function UploadMicrositeV2TemplatePanel({
  template,
  onClose,
  onSaved,
}: {
  template: MicrositeV2Template | null;
  onClose: () => void;
  onSaved: () => void;
}) {
  const isEdit = Boolean(template);

  const [slug, setSlug] = useState(template?.slug || '');
  const [name, setName] = useState(template?.name || '');
  const [description, setDescription] = useState(template?.description || '');
  const [templateHtml, setTemplateHtml] = useState<File | null>(null);
  const [templateJson, setTemplateJson] = useState<File | null>(null);
  const [thumbnail, setThumbnail] = useState<File | null>(null);
  const [assetsZip, setAssetsZip] = useState<File | null>(null);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState('');

  const handleSave = async () => {
    setSaving(true);
    setError('');
    try {
      let templateId = template?._id;

      if (!isEdit) {
        if (!slug.trim() || !name.trim()) {
          throw new Error('Slug and name are required');
        }
        const createRes = await staticMicrositeApi.createTemplate({
          slug: slug.trim(),
          name: name.trim(),
          description: description.trim() || undefined,
        });
        if (createRes.error || !createRes.data) throw new Error(createRes.error || 'Create failed');
        templateId = createRes.data._id;
      } else if (name !== template?.name || description !== template?.description) {
        const updateRes = await staticMicrositeApi.updateTemplate(template!._id, {
          name: name.trim(),
          description: description.trim(),
        });
        if (updateRes.error) throw new Error(updateRes.error);
      }

      if (!templateId) throw new Error('Missing template id');

      const hasFiles = templateHtml || templateJson || thumbnail || assetsZip;
      if (!isEdit && (!templateHtml || !templateJson)) {
        throw new Error('template.html and template.json are required for new templates');
      }

      if (hasFiles) {
        const uploadRes = await staticMicrositeApi.uploadTemplateFiles(templateId, {
          templateHtml: templateHtml || undefined,
          templateJson: templateJson || undefined,
          thumbnail: thumbnail || undefined,
          assetsZip: assetsZip || undefined,
        });
        if (uploadRes.error) throw new Error(uploadRes.error);
      }

      onSaved();
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Save failed');
    } finally {
      setSaving(false);
    }
  };

  return (
    <PanelShell
      title={isEdit ? 'Edit template' : 'New microsite template'}
      description="Upload template.html, template.json, thumbnail, and optional assets zip."
      onClose={onClose}
      panelWidth="min(520px, 100vw)"
      ctaLabel={saving ? 'Saving…' : 'Save'}
      ctaDisabled={saving}
      onCtaClick={() => void handleSave()}
    >
      {error ? <p style={{ color: 'var(--destructive)', fontSize: 'var(--text-sm)', marginBottom: '12px' }}>{error}</p> : null}

      <div style={{ display: 'flex', flexDirection: 'column', gap: '16px' }}>
        <div>
          <Label text="Slug" />
          <Field>
            <input
              type="text"
              value={slug}
              disabled={isEdit}
              onChange={(e) => setSlug(e.target.value.toLowerCase().replace(/[^a-z0-9-]/g, ''))}
              placeholder="event-up"
              style={inputStyle}
            />
          </Field>
          <HelperText text="Unique id used in S3 paths. Cannot change after create." />
        </div>

        <div>
          <Label text="Name" />
          <Field>
            <input type="text" value={name} onChange={(e) => setName(e.target.value)} style={inputStyle} />
          </Field>
        </div>

        <div>
          <Label text="Description" />
          <Field>
            <textarea value={description} onChange={(e) => setDescription(e.target.value)} rows={2} style={{ ...inputStyle, resize: 'vertical' }} />
          </Field>
        </div>

        <div>
          <Label text={`template.html ${isEdit ? '(optional)' : '(required)'}`} />
          <input type="file" accept=".html,text/html" onChange={(e) => setTemplateHtml(e.target.files?.[0] || null)} />
        </div>

        <div>
          <Label text={`template.json ${isEdit ? '(optional)' : '(required)'}`} />
          <input type="file" accept=".json,application/json" onChange={(e) => setTemplateJson(e.target.files?.[0] || null)} />
        </div>

        <div>
          <Label text="Thumbnail (optional)" />
          <input type="file" accept="image/*" onChange={(e) => setThumbnail(e.target.files?.[0] || null)} />
        </div>

        <div>
          <Label text="Assets zip (optional)" />
          <input type="file" accept=".zip,application/zip" onChange={(e) => setAssetsZip(e.target.files?.[0] || null)} />
          <HelperText text="Zip contents are extracted to templates/{slug}/assets/" />
        </div>

        <button
          type="button"
          disabled={saving}
          onClick={() => void handleSave()}
          style={{
            display: 'inline-flex',
            alignItems: 'center',
            gap: '6px',
            padding: '8px 14px',
            borderRadius: 'var(--radius-button)',
            border: 'none',
            background: 'var(--primary)',
            color: 'var(--primary-foreground)',
            cursor: saving ? 'wait' : 'pointer',
            fontSize: 'var(--text-sm)',
            alignSelf: 'flex-start',
          }}
        >
          <Save size={14} />
          {saving ? 'Saving…' : 'Save template'}
        </button>
      </div>
    </PanelShell>
  );
}