/**
 * @ai-summary Mobile screen for viewing centralized audit logs
 * @ai-context Touch-friendly card layout with collapsible filters
 */

import React, { useState, useCallback } from 'react';
import dayjs from 'dayjs';
import { GlassCard } from '../../../shared-minimal/components/mobile/GlassCard';
import { useUnifiedAuditLogs, useExportAuditLogs } from '../hooks/useAuditLogs';
import {
  AuditLogCategory,
  AuditLogSeverity,
  AuditLogFilters,
  UnifiedAuditLog,
} from '../types/admin.types';

// Helper to format date
const formatDate = (dateString: string): string => {
  return dayjs(dateString).format('MMM DD HH:mm');
};

// Severity colors for badges
const severityColors: Record<AuditLogSeverity, string> = {
  info: 'bg-blue-100 text-blue-800',
  warning: 'bg-yellow-100 text-yellow-800',
  error: 'bg-red-100 text-red-800',
};

// Category colors for badges
const categoryColors: Record<AuditLogCategory, string> = {
  auth: 'bg-purple-100 text-purple-800',
  vehicle: 'bg-green-100 text-green-800',
  user: 'bg-indigo-100 text-indigo-800',
  system: 'bg-gray-100 text-gray-800',
  admin: 'bg-orange-100 text-orange-800',
};

const categoryLabels: Record<AuditLogCategory, string> = {
  auth: 'Auth',
  vehicle: 'Vehicle',
  user: 'User',
  system: 'System',
  admin: 'Admin',
};

const AdminLogsMobileScreen: React.FC = () => {
  // Filter state
  const [showFilters, setShowFilters] = useState(false);
  const [search, setSearch] = useState('');
  const [category, setCategory] = useState<AuditLogCategory | ''>('');
  const [severity, setSeverity] = useState<AuditLogSeverity | ''>('');
  const [page, setPage] = useState(0);
  const pageSize = 20;

  // Build filters object
  const filters: AuditLogFilters = {
    ...(search && { search }),
    ...(category && { category }),
    ...(severity && { severity }),
    limit: pageSize,
    offset: page * pageSize,
  };

  // Query
  const { data, isLoading, error, refetch } = useUnifiedAuditLogs(filters);
  const exportMutation = useExportAuditLogs();

  // Handlers
  const handleSearchChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
    setSearch(e.target.value);
    setPage(0);
  }, []);

  const handleCategoryChange = useCallback((e: React.ChangeEvent<HTMLSelectElement>) => {
    setCategory(e.target.value as AuditLogCategory | '');
    setPage(0);
  }, []);

  const handleSeverityChange = useCallback((e: React.ChangeEvent<HTMLSelectElement>) => {
    setSeverity(e.target.value as AuditLogSeverity | '');
    setPage(0);
  }, []);

  const handleClearFilters = useCallback(() => {
    setSearch('');
    setCategory('');
    setSeverity('');
    setPage(0);
  }, []);

  const handleExport = useCallback(() => {
    const exportFilters: AuditLogFilters = {
      ...(search && { search }),
      ...(category && { category }),
      ...(severity && { severity }),
    };
    exportMutation.mutate(exportFilters);
  }, [search, category, severity, exportMutation]);

  const handleNextPage = useCallback(() => {
    if (data && (page + 1) * pageSize < data.total) {
      setPage(p => p + 1);
    }
  }, [data, page, pageSize]);

  const handlePrevPage = useCallback(() => {
    if (page > 0) {
      setPage(p => p - 1);
    }
  }, [page]);

  const hasActiveFilters = search || category || severity;
  const totalPages = data ? Math.ceil(data.total / pageSize) : 0;

  return (
    <div className="space-y-4 pb-20">
      {/* Header */}
      <GlassCard>
        <div className="p-4">
          <div className="flex items-center justify-between mb-2">
            <h1 className="text-xl font-bold text-slate-800">Admin Logs</h1>
            <button
              onClick={() => setShowFilters(!showFilters)}
              className="p-2 rounded-lg bg-slate-100 hover:bg-slate-200 transition-colors"
              aria-label="Toggle filters"
            >
              <svg className="w-5 h-5 text-slate-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 4a1 1 0 011-1h16a1 1 0 011 1v2.586a1 1 0 01-.293.707l-6.414 6.414a1 1 0 00-.293.707V17l-4 4v-6.586a1 1 0 00-.293-.707L3.293 7.293A1 1 0 013 6.586V4z" />
              </svg>
            </button>
          </div>
          <p className="text-sm text-slate-500">
            View audit logs across all system activities
          </p>
        </div>
      </GlassCard>

      {/* Collapsible Filters */}
      {showFilters && (
        <GlassCard>
          <div className="p-4 space-y-3">
            <div className="flex items-center justify-between">
              <span className="text-sm font-medium text-slate-700">Filters</span>
              {hasActiveFilters && (
                <button
                  onClick={handleClearFilters}
                  className="text-xs text-blue-600 hover:text-blue-800"
                >
                  Clear All
                </button>
              )}
            </div>

            {/* Search */}
            <input
              type="text"
              placeholder="Search actions..."
              value={search}
              onChange={handleSearchChange}
              className="w-full px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500"
            />

            {/* Category & Severity Row */}
            <div className="flex gap-2">
              <select
                value={category}
                onChange={handleCategoryChange}
                className="flex-1 px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 bg-white"
              >
                <option value="">All Categories</option>
                <option value="auth">Authentication</option>
                <option value="vehicle">Vehicle</option>
                <option value="user">User</option>
                <option value="system">System</option>
                <option value="admin">Admin</option>
              </select>

              <select
                value={severity}
                onChange={handleSeverityChange}
                className="flex-1 px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 bg-white"
              >
                <option value="">All Severities</option>
                <option value="info">Info</option>
                <option value="warning">Warning</option>
                <option value="error">Error</option>
              </select>
            </div>

            {/* Export Button */}
            <button
              onClick={handleExport}
              disabled={exportMutation.isPending}
              className="w-full flex items-center justify-center gap-2 px-4 py-2 text-sm font-medium text-white bg-blue-600 rounded-lg hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
            >
              {exportMutation.isPending ? (
                <span className="animate-spin">...</span>
              ) : (
                <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4" />
                </svg>
              )}
              Export CSV
            </button>
          </div>
        </GlassCard>
      )}

      {/* Error State */}
      {error && (
        <GlassCard>
          <div className="p-4 text-center">
            <p className="text-red-600 text-sm mb-2">Failed to load audit logs</p>
            <button
              onClick={() => refetch()}
              className="text-sm text-blue-600 hover:text-blue-800"
            >
              Try Again
            </button>
          </div>
        </GlassCard>
      )}

      {/* Loading State */}
      {isLoading && (
        <GlassCard>
          <div className="p-6 text-center">
            <div className="animate-pulse text-slate-500">Loading logs...</div>
          </div>
        </GlassCard>
      )}

      {/* Empty State */}
      {!isLoading && data?.logs.length === 0 && (
        <GlassCard>
          <div className="p-6 text-center">
            <svg className="w-12 h-12 mx-auto text-slate-300 mb-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
            </svg>
            <p className="text-slate-500 text-sm">No audit logs found</p>
          </div>
        </GlassCard>
      )}

      {/* Log Cards */}
      {!isLoading && data?.logs.map((log: UnifiedAuditLog) => (
        <GlassCard key={log.id}>
          <div className="p-4">
            {/* Header Row */}
            <div className="flex items-start justify-between mb-2">
              <div className="flex flex-wrap gap-1.5">
                <span className={`px-2 py-0.5 text-xs font-medium rounded-full ${categoryColors[log.category]}`}>
                  {categoryLabels[log.category]}
                </span>
                <span className={`px-2 py-0.5 text-xs font-medium rounded-full ${severityColors[log.severity]}`}>
                  {log.severity}
                </span>
              </div>
              <span className="text-xs text-slate-400">
                {formatDate(log.createdAt)}
              </span>
            </div>

            {/* Action */}
            <p className="text-sm text-slate-800 mb-2 line-clamp-2">
              {log.action}
            </p>

            {/* Metadata */}
            <div className="flex flex-wrap gap-x-4 gap-y-1 text-xs text-slate-500">
              {log.userId && (
                <span className="truncate max-w-[150px]">
                  User: {log.userId.substring(0, 16)}...
                </span>
              )}
              {log.resourceType && log.resourceId && (
                <span className="truncate max-w-[150px]">
                  {log.resourceType}: {log.resourceId.substring(0, 10)}...
                </span>
              )}
            </div>
          </div>
        </GlassCard>
      ))}

      {/* Pagination */}
      {!isLoading && data && data.total > pageSize && (
        <GlassCard>
          <div className="p-3 flex items-center justify-between">
            <button
              onClick={handlePrevPage}
              disabled={page === 0}
              className="px-3 py-1.5 text-sm font-medium text-slate-600 bg-slate-100 rounded-lg hover:bg-slate-200 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
            >
              Previous
            </button>
            <span className="text-sm text-slate-500">
              Page {page + 1} of {totalPages}
            </span>
            <button
              onClick={handleNextPage}
              disabled={(page + 1) * pageSize >= data.total}
              className="px-3 py-1.5 text-sm font-medium text-slate-600 bg-slate-100 rounded-lg hover:bg-slate-200 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
            >
              Next
            </button>
          </div>
        </GlassCard>
      )}

      {/* Total Count */}
      {!isLoading && data && (
        <div className="text-center text-xs text-slate-400">
          {data.total} total log{data.total !== 1 ? 's' : ''}
        </div>
      )}
    </div>
  );
};

export default AdminLogsMobileScreen;
