'use client';

import { useState } from 'react';
import {
  CheckCircle,
  FileText,
  Flag,
  Shield,
  XCircle,
  Building2,
} from 'lucide-react';
import { Badge } from '@nextcraft/ui';
import {
  employerVerificationQueue,
  flaggedContentQueue,
  jobReviewQueue,
} from '@nextcraft/mock-data';
import type {
  EmployerVerificationItem,
  FlaggedContentItem,
  JobReviewItem,
} from '@nextcraft/mock-data';

type TabId = 'jobs' | 'employers' | 'flagged';

const TABS: Array<{ id: TabId; label: string }> = [
  { id: 'jobs', label: 'Job Posting Review' },
  { id: 'employers', label: 'Employer Verification' },
  { id: 'flagged', label: 'Flagged Content' },
];

const STATUS_VARIANT = { ok: 'success', warn: 'warning', err: 'error' } as const;

export function ModerationTabs() {
  const [tab, setTab] = useState<TabId>('jobs');

  const counts: Record<TabId, number> = {
    jobs: jobReviewQueue.length,
    employers: employerVerificationQueue.length,
    flagged: flaggedContentQueue.length,
  };

  return (
    <div className="flex flex-col gap-5">
      {/* Tab bar */}
      <div className="flex flex-wrap gap-1 rounded-lg border border-slate-200 bg-white p-1 dark:border-slate-800 dark:bg-slate-900">
        {TABS.map((t) => {
          const active = t.id === tab;
          return (
            <button
              key={t.id}
              type="button"
              onClick={() => setTab(t.id)}
              className={`inline-flex items-center gap-2 rounded-md px-3.5 py-2 text-sm font-medium transition-colors ${
                active
                  ? 'bg-primary-600 text-white shadow-sm'
                  : 'text-slate-700 hover:bg-slate-100 dark:text-slate-200 dark:hover:bg-slate-800'
              }`}
              aria-pressed={active}
            >
              {t.label}
              <span
                className={`inline-flex h-5 min-w-5 items-center justify-center rounded-full px-1.5 text-xs font-semibold ${
                  active
                    ? 'bg-white/20 text-white'
                    : 'bg-slate-200 text-slate-700 dark:bg-slate-700 dark:text-slate-200'
                }`}
              >
                {counts[t.id]}
              </span>
            </button>
          );
        })}
      </div>

      {tab === 'jobs' && <JobReviewTab />}
      {tab === 'employers' && <EmployerVerificationTab />}
      {tab === 'flagged' && <FlaggedContentTab />}
    </div>
  );
}

// ---------------------------------------------------------------------------
// Tab 1: Job Posting Review
// ---------------------------------------------------------------------------

function JobReviewTab() {
  return (
    <div className="flex flex-col gap-3">
      {jobReviewQueue.map((item) => (
        <JobReviewCard key={item.id} item={item} />
      ))}
    </div>
  );
}

function JobReviewCard({ item }: { item: JobReviewItem }) {
  return (
    <div className="flex flex-col gap-3 rounded-lg border border-slate-200 bg-white p-4 shadow-sm dark:border-slate-800 dark:bg-slate-900">
      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
        <div className="flex items-start gap-3">
          <span className="inline-flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-amber-100 text-amber-700 dark:bg-amber-900/40 dark:text-amber-300">
            <FileText className="h-5 w-5" />
          </span>
          <div className="flex flex-col gap-0.5">
            <h3 className="text-sm font-semibold text-slate-900 dark:text-slate-100">
              {item.title}
            </h3>
            <p className="text-xs text-slate-500 dark:text-slate-400">
              {item.employerName} · {item.stackName}
            </p>
            <p className="text-xs text-slate-500 dark:text-slate-400">
              {item.location} · Submitted {formatDate(item.submittedAt)}
            </p>
          </div>
        </div>
        <button
          type="button"
          className="inline-flex h-8 items-center justify-center rounded-md border border-slate-300 px-3 text-xs font-medium text-slate-700 transition-colors hover:bg-slate-50 dark:border-slate-700 dark:text-slate-200 dark:hover:bg-slate-800"
        >
          Review
        </button>
      </div>
      <div className="flex flex-wrap gap-2 border-t border-slate-100 pt-3 dark:border-slate-800">
        <ActionButton tone="success" icon={<CheckCircle className="h-3.5 w-3.5" />}>
          Approve
        </ActionButton>
        <ActionButton tone="error" icon={<XCircle className="h-3.5 w-3.5" />}>
          Reject
        </ActionButton>
        <ActionButton tone="warning" icon={<Flag className="h-3.5 w-3.5" />}>
          Flag
        </ActionButton>
      </div>
    </div>
  );
}

// ---------------------------------------------------------------------------
// Tab 2: Employer Verification
// ---------------------------------------------------------------------------

function EmployerVerificationTab() {
  return (
    <div className="flex flex-col gap-3">
      {employerVerificationQueue.map((item) => (
        <EmployerVerificationCard key={item.id} item={item} />
      ))}
    </div>
  );
}

function EmployerVerificationCard({ item }: { item: EmployerVerificationItem }) {
  return (
    <div className="flex flex-col gap-3 rounded-lg border border-slate-200 bg-white p-4 shadow-sm dark:border-slate-800 dark:bg-slate-900">
      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
        <div className="flex items-start gap-3">
          <span className="inline-flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-primary-100 text-sm font-semibold text-primary-700 dark:bg-primary-900/40 dark:text-primary-200">
            {item.logoInitials}
          </span>
          <div className="flex flex-col gap-0.5">
            <h3 className="text-sm font-semibold text-slate-900 dark:text-slate-100">
              {item.name}
            </h3>
            <p className="text-xs text-slate-500 dark:text-slate-400">
              {item.industry} · {item.location}
            </p>
            <p className="text-xs text-slate-500 dark:text-slate-400">
              Submitted {formatDate(item.submittedAt)}
            </p>
          </div>
        </div>
        <button
          type="button"
          className="inline-flex h-8 items-center justify-center rounded-md border border-slate-300 px-3 text-xs font-medium text-slate-700 transition-colors hover:bg-slate-50 dark:border-slate-700 dark:text-slate-200 dark:hover:bg-slate-800"
        >
          Review Documents
        </button>
      </div>
      <div className="flex flex-wrap gap-2 border-t border-slate-100 pt-3 dark:border-slate-800">
        <ActionButton tone="success" icon={<CheckCircle className="h-3.5 w-3.5" />}>
          Verify
        </ActionButton>
        <ActionButton tone="info" icon={<Building2 className="h-3.5 w-3.5" />}>
          Request More Info
        </ActionButton>
        <ActionButton tone="error" icon={<XCircle className="h-3.5 w-3.5" />}>
          Reject
        </ActionButton>
      </div>
    </div>
  );
}

// ---------------------------------------------------------------------------
// Tab 3: Flagged Content
// ---------------------------------------------------------------------------

function FlaggedContentTab() {
  return (
    <div className="flex flex-col gap-3">
      {flaggedContentQueue.map((item) => (
        <FlaggedContentCard key={item.id} item={item} />
      ))}
    </div>
  );
}

function FlaggedContentCard({ item }: { item: FlaggedContentItem }) {
  return (
    <div className="flex flex-col gap-3 rounded-lg border border-slate-200 bg-white p-4 shadow-sm dark:border-slate-800 dark:bg-slate-900">
      <div className="flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
        <div className="flex items-start gap-3">
          <span className="inline-flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-rose-100 text-rose-700 dark:bg-rose-900/40 dark:text-rose-300">
            <Shield className="h-5 w-5" />
          </span>
          <div className="flex flex-col gap-1">
            <div className="flex flex-wrap items-center gap-2">
              <h3 className="text-sm font-semibold text-slate-900 dark:text-slate-100">
                {item.title}
              </h3>
              <Badge variant="warning">{item.contentType}</Badge>
            </div>
            <p className="text-xs text-slate-500 dark:text-slate-400">
              Flagged by {item.flaggedBy} · {item.reason}
            </p>
            <p className="text-xs text-slate-500 dark:text-slate-400">
              {formatDate(item.flaggedAt)}
            </p>
          </div>
        </div>
      </div>
      <div className="flex flex-wrap gap-2 border-t border-slate-100 pt-3 dark:border-slate-800">
        <ActionButton tone="neutral" icon={<XCircle className="h-3.5 w-3.5" />}>
          Dismiss Flag
        </ActionButton>
        <ActionButton tone="error" icon={<XCircle className="h-3.5 w-3.5" />}>
          Remove Content
        </ActionButton>
        <ActionButton tone="warning" icon={<Flag className="h-3.5 w-3.5" />}>
          Warn User
        </ActionButton>
      </div>
    </div>
  );
}

// ---------------------------------------------------------------------------
// Shared action button
// ---------------------------------------------------------------------------

type ActionTone = 'success' | 'error' | 'warning' | 'info' | 'neutral';

const ACTION_CLASSES: Record<ActionTone, string> = {
  success: 'border-emerald-300 bg-emerald-50 text-emerald-700 hover:bg-emerald-100 dark:border-emerald-800 dark:bg-emerald-900/30 dark:text-emerald-300 dark:hover:bg-emerald-900/50',
  error: 'border-rose-300 bg-rose-50 text-rose-700 hover:bg-rose-100 dark:border-rose-800 dark:bg-rose-900/30 dark:text-rose-300 dark:hover:bg-rose-900/50',
  warning: 'border-amber-300 bg-amber-50 text-amber-700 hover:bg-amber-100 dark:border-amber-800 dark:bg-amber-900/30 dark:text-amber-300 dark:hover:bg-amber-900/50',
  info: 'border-primary-300 bg-primary-50 text-primary-700 hover:bg-primary-100 dark:border-primary-800 dark:bg-primary-900/30 dark:text-primary-300 dark:hover:bg-primary-900/50',
  neutral: 'border-slate-300 bg-slate-50 text-slate-700 hover:bg-slate-100 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-200 dark:hover:bg-slate-700',
};

function ActionButton({
  tone,
  icon,
  children,
}: {
  tone: ActionTone;
  icon: React.ReactNode;
  children: React.ReactNode;
}) {
  return (
    <button
      type="button"
      className={`inline-flex h-8 items-center gap-1.5 rounded-md border px-3 text-xs font-medium transition-colors ${ACTION_CLASSES[tone]}`}
    >
      {icon}
      {children}
    </button>
  );
}

function formatDate(iso: string): string {
  return new Date(iso).toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
  });
}