import React, { useState } from 'react';
import { createPortal } from 'react-dom';
import { useEditor } from '@craftjs/core';
import { Modal } from '../../ui/Modal';
import { useEditorConfig } from '../../state/EditorConfigContext';
import { usePages } from '../../state/PageContext';
import { buildReportPayload, MAX_DESCRIPTION_CHARS, type ReportCategory } from '../../utils/report-payload';
import { getRecentConsoleErrors } from '../../utils/console-buffer';
import { editorBuild } from '../../utils/build-stamp';

export interface ReportIssueModalProps {
  open: boolean;
  onClose: () => void;
  device: string;
}

const CATEGORIES: { value: ReportCategory; label: string }[] = [
  { value: 'bug', label: 'Something is broken' },
  { value: 'confusing', label: 'Something is confusing' },
  { value: 'feature', label: 'I wish it could…' },
];

/** Only start showing the running character count once it's actually useful
 *  -- i.e. once the user is close enough to MAX_DESCRIPTION_CHARS that
 *  losing text is a real possibility, not on every keystroke from zero. */
const COUNTER_THRESHOLD = MAX_DESCRIPTION_CHARS - 500;

export const ReportIssueModal: React.FC<ReportIssueModalProps> = ({ open, onClose, device }) => {
  const { whpConfig } = useEditorConfig();
  const { activePageId, pages } = usePages();
  // Guarded with optional chaining: some hosts around this component (e.g.
  // TopBar's own test harness) stub `useEditor` with a minimal collector
  // state that has no `events`/`nodes` at all -- this must degrade to "no
  // selection known" rather than throw and take the whole topbar down.
  const { query, selectedType } = useEditor((state: any) => {
    const sel = state?.events?.selected;
    const id = sel && sel.size > 0 ? (Array.from(sel)[0] as string) : null;
    return { selectedType: id ? (state?.nodes?.[id]?.data?.displayName ?? null) : null };
  });

  const [category, setCategory] = useState<ReportCategory>('bug');
  const [description, setDescription] = useState('');
  const [includeCanvas, setIncludeCanvas] = useState(true);
  const [status, setStatus] = useState<'idle' | 'sending' | 'sent' | 'error'>('idle');
  const [reference, setReference] = useState('');
  const [error, setError] = useState('');

  const activePage = pages.find((p) => p.id === activePageId);

  const reset = (): void => {
    setDescription('');
    setStatus('idle');
    setReference('');
    setError('');
  };

  const handleSubmit = async (): Promise<void> => {
    if (!description.trim() || !whpConfig) return;
    setStatus('sending');
    setError('');

    let canvasState: string | null = null;
    try {
      canvasState = query.serialize();
    } catch {
      // A serialize failure must not block the report -- it is often the
      // very thing being reported.
      canvasState = null;
    }

    let payload;
    try {
      payload = buildReportPayload({
        category,
        description,
        includeCanvas,
        siteId: whpConfig.siteId ?? null,
        siteDomain: whpConfig.siteDomain ?? '',
        pageId: activePageId,
        pageSlug: activePage?.slug ?? '',
        editorVersion: editorBuild(),
        userAgent: typeof navigator !== 'undefined' ? navigator.userAgent : '',
        viewport: typeof window !== 'undefined' ? `${window.innerWidth}x${window.innerHeight}` : '',
        deviceMode: device,
        selectedType,
        consoleErrors: getRecentConsoleErrors(),
        canvasState,
      });
    } catch {
      // buildReportPayload throws (rather than returning an oversized body)
      // when the payload is still over the cap even after dropping
      // canvas_state -- e.g. an enormous description. The thrown value is a
      // plain Error with no discriminator, so treat ANY throw here as "too
      // large" rather than string-matching the message. The user's text is
      // left untouched in the textarea (state.description is never reset on
      // this path) so nothing is lost -- they just need to shorten it or
      // untick "include this page's contents".
      setError(
        'This report is too large to send, even without the page contents. ' +
          'Try unchecking "Include this page\'s contents" below, or shortening your description.',
      );
      setStatus('error');
      return;
    }

    try {
      const resp = await fetch(`${whpConfig.apiUrl}?action=report_issue`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-CSRF-Token': whpConfig.csrfToken,
        },
        body: JSON.stringify(payload),
      });
      const data = await resp.json();
      if (!resp.ok || !data.success) {
        setError(data.error || 'Could not send the report. Please try again.');
        setStatus('error');
        return;
      }
      setReference(data.reference || `SB-${data.id}`);
      setStatus('sent');
    } catch (e) {
      setError('Could not reach the server. Your text is still here — try again.');
      setStatus('error');
    }
  };

  const handleClose = (): void => {
    if (status === 'sent') reset();
    onClose();
  };

  return createPortal(
    <Modal open={open} onClose={handleClose} width="min(560px, 92vw)">
      <div
        style={{
          background: 'var(--color-bg-surface)',
          border: '1px solid var(--color-border)',
          borderRadius: 12,
          boxShadow: '0 20px 60px rgba(0,0,0,0.5)',
          overflow: 'hidden',
        }}
        onClick={(e) => e.stopPropagation()}
      >
        <div style={{
          display: 'flex', alignItems: 'center', justifyContent: 'space-between',
          padding: '14px 16px', borderBottom: '1px solid var(--color-border)',
        }}>
          <div style={{ fontSize: 14, fontWeight: 600, color: 'var(--color-text)' }}>Report an issue</div>
          <button
            onClick={handleClose}
            aria-label="Close"
            style={{
              width: 28, height: 28, display: 'inline-flex', alignItems: 'center', justifyContent: 'center',
              background: 'none', border: '1px solid var(--color-border)', borderRadius: 6,
              color: 'var(--color-text-muted)', cursor: 'pointer', fontSize: 13,
            }}
          >
            <i className="fa fa-times" />
          </button>
        </div>

        {status === 'sent' ? (
          <div style={{ padding: 24, textAlign: 'center' }}>
            <i className="fa fa-check-circle" style={{ fontSize: 32, color: '#10b981' }} aria-hidden="true" />
            <p style={{ fontSize: 14, color: 'var(--color-text)', margin: '12px 0 4px' }}>
              Thanks — that's been sent.
            </p>
            <p style={{ fontSize: 12, color: 'var(--color-text-muted)', margin: 0 }}>
              Your reference is <strong>{reference}</strong>. Quote it if you open a support ticket.
            </p>
            <button
              onClick={handleClose}
              style={{
                marginTop: 16, padding: '7px 20px', fontSize: 13, fontWeight: 600,
                background: 'var(--color-accent)', color: '#fff', border: 'none', borderRadius: 6, cursor: 'pointer',
              }}
            >
              Done
            </button>
          </div>
        ) : (
          <>
            <div style={{ padding: 16, display: 'flex', flexDirection: 'column', gap: 12 }}>
              <div>
                <label style={{ fontSize: 11, color: 'var(--color-text-muted)', display: 'block', marginBottom: 4 }}>
                  What kind of issue is it?
                </label>
                <select
                  data-testid="report-category"
                  value={category}
                  onChange={(e) => setCategory(e.target.value as ReportCategory)}
                  style={{
                    width: '100%', padding: '6px 8px', fontSize: 12,
                    background: '#27272a', color: '#e4e4e7',
                    border: '1px solid #3f3f46', borderRadius: 4,
                  }}
                >
                  {CATEGORIES.map((c) => (
                    <option key={c.value} value={c.value}>{c.label}</option>
                  ))}
                </select>
              </div>

              <div>
                <label style={{ fontSize: 11, color: 'var(--color-text-muted)', display: 'block', marginBottom: 4 }}>
                  What happened?
                </label>
                <textarea
                  data-testid="report-description"
                  value={description}
                  onChange={(e) => setDescription(e.target.value)}
                  rows={5}
                  maxLength={MAX_DESCRIPTION_CHARS}
                  placeholder="What were you doing, and what did you expect to happen instead?"
                  style={{
                    width: '100%', padding: '8px 10px', fontSize: 12, lineHeight: 1.5,
                    background: '#27272a', color: '#e4e4e7',
                    border: '1px solid #3f3f46', borderRadius: 4,
                    resize: 'vertical', boxSizing: 'border-box',
                  }}
                />
                {description.length >= COUNTER_THRESHOLD && (
                  <div
                    data-testid="report-description-count"
                    style={{
                      fontSize: 10,
                      color: description.length >= MAX_DESCRIPTION_CHARS ? '#fca5a5' : 'var(--color-text-muted)',
                      textAlign: 'right',
                      marginTop: 4,
                    }}
                  >
                    {description.length} / {MAX_DESCRIPTION_CHARS}
                  </div>
                )}
              </div>

              <label style={{ display: 'flex', gap: 8, alignItems: 'flex-start', cursor: 'pointer' }}>
                <input
                  data-testid="report-include-canvas"
                  type="checkbox"
                  checked={includeCanvas}
                  onChange={(e) => setIncludeCanvas(e.target.checked)}
                  style={{ marginTop: 2 }}
                />
                <span style={{ fontSize: 11, color: 'var(--color-text-muted)', lineHeight: 1.5 }}>
                  Include this page's contents to help debugging. This sends the text and
                  layout of the page you're editing along with your report. Uncheck it and
                  we'll still get your description, the page name, your browser details, and
                  any recent console errors -- but not the page's text or layout.
                </span>
              </label>

              {status === 'error' && (
                <div style={{
                  fontSize: 11, color: '#fca5a5', background: 'rgba(239,68,68,0.1)',
                  border: '1px solid rgba(239,68,68,0.35)', borderRadius: 4, padding: '8px 10px',
                }}>
                  {error}
                </div>
              )}
            </div>

            <div style={{
              padding: '10px 16px', borderTop: '1px solid var(--color-border)',
              display: 'flex', justifyContent: 'flex-end', gap: 8,
            }}>
              <button
                onClick={handleClose}
                style={{
                  padding: '7px 16px', fontSize: 13,
                  background: 'var(--color-bg-elevated)', color: 'var(--color-text-muted)',
                  border: '1px solid var(--color-border)', borderRadius: 6, cursor: 'pointer',
                }}
              >
                Cancel
              </button>
              <button
                data-action="submit-report"
                disabled={!description.trim() || status === 'sending'}
                onClick={handleSubmit}
                style={{
                  padding: '7px 20px', fontSize: 13, fontWeight: 600,
                  background: 'var(--color-accent)', color: '#fff', border: 'none', borderRadius: 6,
                  cursor: description.trim() && status !== 'sending' ? 'pointer' : 'not-allowed',
                  opacity: description.trim() && status !== 'sending' ? 1 : 0.5,
                }}
              >
                {status === 'sending' ? 'Sending…' : 'Send report'}
              </button>
            </div>
          </>
        )}
      </div>
    </Modal>,
    document.body,
  );
};