'use client';

import { useRouter } from 'next/navigation';
import { useState } from 'react';

type Props = {
  campaign: {
    id: string;
    name: string;
    status: string;
    totalRecipients: number;
    templateName: string;
    language: string;
    messageTitle: string;
    messageBody: string;
    primaryButton: string;
    secondaryButton: string;
    bannerImageUrl: string;
  };
};

function toDateTimeLocal(value: string | null | undefined) {
  if (!value) return '';
  const date = new Date(value);
  const offset = date.getTimezoneOffset();
  const local = new Date(date.getTime() - offset * 60000);
  return local.toISOString().slice(0, 16);
}

export function CampaignDetailActions({ campaign }: Props) {
  const router = useRouter();
  const [isDuplicating, setIsDuplicating] = useState(false);
  const [isSaving, setIsSaving] = useState(false);
  const [isSendingNow, setIsSendingNow] = useState(false);
  const [isScheduling, setIsScheduling] = useState(false);
  const [isDeleting, setIsDeleting] = useState(false);
  const [message, setMessage] = useState<string | null>(null);
  const [isEditing, setIsEditing] = useState(false);
  const [scheduledAt, setScheduledAt] = useState('');
  const [form, setForm] = useState({
    name: campaign.name,
    status: campaign.status,
    totalRecipients: String(campaign.totalRecipients),
    templateName: campaign.templateName,
    language: campaign.language,
    messageTitle: campaign.messageTitle,
    messageBody: campaign.messageBody,
    primaryButton: campaign.primaryButton,
    secondaryButton: campaign.secondaryButton,
    bannerImageUrl: campaign.bannerImageUrl,
  });

  async function readPayload(response: Response) {
    const payload = await response.json().catch(() => ({}));
    if (!response.ok) {
      throw new Error(typeof payload?.message === 'string' ? payload.message : 'Request failed');
    }

    return payload;
  }

  return (
    <>
      <div className="campaign-detail-header-actions">
        <button
          type="button"
          className="campaign-detail-secondary-button"
          onClick={() => {
            setMessage(null);
            setIsEditing((value) => !value);
          }}
        >
          <span className="material-symbols-outlined">edit</span>
          {isEditing ? 'Close Edit' : 'Edit'}
        </button>
        <button
          type="button"
          className="campaign-detail-secondary-button"
          disabled={isDuplicating}
          onClick={async () => {
            try {
              setMessage(null);
              setIsDuplicating(true);
              const response = await fetch(`/api/campaigns/${campaign.id}/duplicate`, {
                method: 'POST',
              });
              const payload = await readPayload(response);
              router.push(`/dashboard/campaigns/${payload.id}`);
              router.refresh();
            } catch (error) {
              setMessage(error instanceof Error ? error.message : 'Failed to duplicate campaign');
            } finally {
              setIsDuplicating(false);
            }
          }}
        >
          <span className="material-symbols-outlined">content_copy</span>
          {isDuplicating ? 'Duplicating...' : 'Duplicate'}
        </button>
        <button
          type="button"
          className="campaign-detail-secondary-button"
          disabled={isSendingNow}
          onClick={async () => {
            try {
              setMessage(null);
              setIsSendingNow(true);
              const response = await fetch(`/api/campaigns/${campaign.id}/send`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ mode: 'now' }),
              });
              await readPayload(response);
              setMessage('Campaign send queued.');
              router.refresh();
            } catch (error) {
              setMessage(error instanceof Error ? error.message : 'Failed to queue campaign');
            } finally {
              setIsSendingNow(false);
            }
          }}
        >
          <span className="material-symbols-outlined">send</span>
          {isSendingNow ? 'Queuing...' : 'Send Now'}
        </button>
        <button
          type="button"
          className="campaign-detail-secondary-button"
          disabled={isScheduling || !scheduledAt}
          onClick={async () => {
            try {
              setMessage(null);
              setIsScheduling(true);
              const response = await fetch(`/api/campaigns/${campaign.id}/send`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ mode: 'scheduled', scheduledAt: new Date(scheduledAt).toISOString() }),
              });
              await readPayload(response);
              setMessage('Campaign scheduled successfully.');
              router.refresh();
            } catch (error) {
              setMessage(error instanceof Error ? error.message : 'Failed to schedule campaign');
            } finally {
              setIsScheduling(false);
            }
          }}
        >
          <span className="material-symbols-outlined">schedule</span>
          {isScheduling ? 'Scheduling...' : 'Schedule'}
        </button>
        <a className="campaign-detail-secondary-button" href={`/api/campaigns/${campaign.id}/export?format=csv`}>
          <span className="material-symbols-outlined">download</span>
          Export CSV
        </a>
        <a className="campaign-detail-primary-button" href={`/api/campaigns/${campaign.id}/export?format=xlsx`}>
          <span className="material-symbols-outlined">download</span>
          Export XLSX
        </a>
      </div>

      <div className="campaign-detail-inline-tools">
        <label className="campaign-detail-schedule-field">
          <span>Schedule at</span>
          <input
            type="datetime-local"
            value={scheduledAt}
            onChange={(event) => setScheduledAt(event.target.value)}
          />
        </label>
        <button
          type="button"
          className="campaign-detail-danger-button"
          disabled={isDeleting}
          onClick={async () => {
            if (!window.confirm(`Delete campaign "${campaign.name}"? This action cannot be undone.`)) {
              return;
            }

            try {
              setMessage(null);
              setIsDeleting(true);
              const response = await fetch(`/api/campaigns/${campaign.id}`, { method: 'DELETE' });
              if (!response.ok && response.status !== 204) {
                await readPayload(response);
              }
              router.push('/dashboard/campaigns');
              router.refresh();
            } catch (error) {
              setMessage(error instanceof Error ? error.message : 'Failed to delete campaign');
            } finally {
              setIsDeleting(false);
            }
          }}
        >
          <span className="material-symbols-outlined">delete</span>
          {isDeleting ? 'Deleting...' : 'Delete'}
        </button>
      </div>

      {message ? <p className="campaign-detail-inline-message">{message}</p> : null}

      {isEditing ? (
        <form
          className="campaign-detail-edit-panel"
          onSubmit={async (event) => {
            event.preventDefault();

            try {
              setMessage(null);
              setIsSaving(true);
              const response = await fetch(`/api/campaigns/${campaign.id}`, {
                method: 'PATCH',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                  ...form,
                  totalRecipients: Number(form.totalRecipients || '0'),
                }),
              });
              await readPayload(response);
              setMessage('Campaign updated successfully.');
              setIsEditing(false);
              router.refresh();
            } catch (error) {
              setMessage(error instanceof Error ? error.message : 'Failed to update campaign');
            } finally {
              setIsSaving(false);
            }
          }}
        >
          <div className="campaign-detail-edit-grid">
            <label className="campaign-detail-field">
              <span>Name</span>
              <input
                value={form.name}
                onChange={(event) => setForm((current) => ({ ...current, name: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field">
              <span>Status</span>
              <select
                value={form.status}
                onChange={(event) => setForm((current) => ({ ...current, status: event.target.value }))}
              >
                <option value="Draft">Draft</option>
                <option value="Scheduled">Scheduled</option>
                <option value="Sent">Sent</option>
                <option value="Failed">Failed</option>
              </select>
            </label>
            <label className="campaign-detail-field">
              <span>Total Recipients</span>
              <input
                type="number"
                min="0"
                value={form.totalRecipients}
                onChange={(event) => setForm((current) => ({ ...current, totalRecipients: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field">
              <span>Template Name</span>
              <input
                value={form.templateName}
                onChange={(event) => setForm((current) => ({ ...current, templateName: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field">
              <span>Language</span>
              <input
                value={form.language}
                onChange={(event) => setForm((current) => ({ ...current, language: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field">
              <span>Banner URL</span>
              <input
                value={form.bannerImageUrl}
                onChange={(event) => setForm((current) => ({ ...current, bannerImageUrl: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field">
              <span>Primary Button</span>
              <input
                value={form.primaryButton}
                onChange={(event) => setForm((current) => ({ ...current, primaryButton: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field">
              <span>Secondary Button</span>
              <input
                value={form.secondaryButton}
                onChange={(event) => setForm((current) => ({ ...current, secondaryButton: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field is-full">
              <span>Message Title</span>
              <input
                value={form.messageTitle}
                onChange={(event) => setForm((current) => ({ ...current, messageTitle: event.target.value }))}
              />
            </label>
            <label className="campaign-detail-field is-full">
              <span>Message Body</span>
              <textarea
                rows={4}
                value={form.messageBody}
                onChange={(event) => setForm((current) => ({ ...current, messageBody: event.target.value }))}
              />
            </label>
          </div>
          <div className="campaign-detail-edit-actions">
            <button type="button" className="campaign-detail-secondary-button" onClick={() => setIsEditing(false)}>
              Cancel
            </button>
            <button type="submit" className="campaign-detail-primary-button" disabled={isSaving}>
              <span className="material-symbols-outlined">save</span>
              {isSaving ? 'Saving...' : 'Save Changes'}
            </button>
          </div>
        </form>
      ) : null}
    </>
  );
}
