import React, {useState, useEffect} from "react";
import { useDispatch, useSelector } from "react-redux";
import { useNavigate, useParams } from "react-router-dom";
import { customerSlice } from "./../../store";
import { AuthService, CustomerService, EventsService, LabelService } from "../../services";
import { CUSTOMER_TYPE, ManageTable } from "../../shared";
import { Spinner, Breadcrumb, BreadcrumbItem, Tabs, Tab, Dropdown, Modal } from "react-bootstrap";
import { Columns, Download, Filter, PencilSquare, PersonSquare, Plus } from "react-bootstrap-icons";

const DashboardCustomersList = ({ additionalButtons, showBreadcrumb = false, title = null }) => {
  const navigate = useNavigate();
  const dispatch = useDispatch();
  const site = EventsService.site;
  const [customers, setCustomers] = useState([]);
  const [keyword, setKeyword] = useState('');
  const [showInactive, setShowInactive] = useState(false);
  const [transferMap, setTransferMap] = useState({});
  const [showSpinner, setShowSpinner] = useState(false);
  const [sorting, setSorting] = useState({key: '', order: ''});
  const [selectedItems, setSelectedItems] = useState([]);
  const [filteredCustomers, setFilteredCustomers] = useState(customers);
  const [showFilterDropdown, setShowFilterDropdown] = useState(false);
  const [showManageTableDropdown, setShowManageTableDropdown] = useState(false);
  const [showExportDropdown, setShowExportDropdown] = useState(false);
  const [tagsFilter, setTagsFilter] = useState([]);
  const [availableLabels, setAvailableLabels] = useState([]);
  const [showAvatarModal, setShowAvatarModal] = useState(false);
  const [avatarData, setAvatarData] = useState(null);
  const [avatarCustomerName, setAvatarCustomerName] = useState('');
  const [avatarLoading, setAvatarLoading] = useState(false);
  const [customerAvatars, setCustomerAvatars] = useState({});
  const isAllCustomersPage = title === 'All Customers';
  const [columns, setColumns] = useState([
    {
      key: 'name',
      label:'Name',
      show: true
    },
    {
      key: 'chinese_name',
      label: 'Preferred Name',
      show: true
    },
    {
      key: 'email',
      label: 'Email',
      show: true
    },
    {
      key: 'type',
      label: 'Type',
      show: true
    },
    {
      key: 'pickup_status',
      label: 'Pickup Status',
      show: true
    },
    {
      key: 'birth_date',
      label: 'Date of Birth',
      show: true
    },
    {
      key: 'gender',
      label: 'Gender',
      show: true
    },
    {
      key: 'language',
      label: 'Language',
      show: true
    },
    {
      key: 'medicare_number',
      label: 'Medicare Number',
      show: true
    },
    {
      key: 'medicaid_number',
      label: 'Medicaid Number',
      show: true
    },
    {
      key: 'address',
      label: 'Address',
      show: true
    },
    {
      key: 'phone',
      label: 'Phone',
      show: true
    },
    {
      key: 'emergency_contact',
      label: 'Fasting',
      show: true
    },
    {
      key: 'tags',
      label: 'Tags',
      show: true
    }
  ]);

  useEffect(() => {
    if (!AuthService.canViewCustomers()) {
      window.alert('You haven\'t login yet OR this user does not have access to this page. Please change an admin account to login.')
      AuthService.logout();
      navigate(`/login`);
    }
    CustomerService.getAllCustomers().then((data) => {
      setCustomers(data.data.map((item) =>{
        item.phone = item?.phone || item?.home_phone || item?.mobile_phone;
        item.address = item?.address1 || item?.address2 || item?.address3 || item?.address4|| item?.address5;

        return item;
      }).sort((a, b) => a.lastname > b.lastname ? 1: -1));
    })
    LabelService.getAll().then((data) => {
      setAvailableLabels(data.data);
    })
  }, []);

  // Load avatars for customers - same approach as ViewCustomer
  useEffect(() => {
    if (customers.length === 0) return;
    customers.forEach((customer) => {
      if (customerAvatars[customer.id] !== undefined) return; // Already loaded or attempted
      // Mark as loading to prevent duplicate requests
      setCustomerAvatars(prev => ({ ...prev, [customer.id]: false }));
      CustomerService.getAvatar(customer.id)
        .then(result => {
          if (result?.data) {
            // Store raw data exactly like ViewCustomer does
            setCustomerAvatars(prev => ({ ...prev, [customer.id]: result.data }));
          } else {
            setCustomerAvatars(prev => ({ ...prev, [customer.id]: null }));
          }
        })
        .catch(() => {
          setCustomerAvatars(prev => ({ ...prev, [customer.id]: null }));
        });
    });
  }, [customers]);

  useEffect(() => {
    let filtered = customers;
    
    // Basic keyword filter
    if (keyword) {
      filtered = filtered.filter((item) => item?.name.toLowerCase().includes(keyword.toLowerCase()));
    }
    
    // Active/Inactive filter
    if (showInactive) {
      // Discharged Customers tab: show customers with type discharged, transferred, or deceased
      filtered = filtered.filter(item => item.type === CUSTOMER_TYPE.TRANSFERRED || item.type === CUSTOMER_TYPE.DECEASED || item.type === CUSTOMER_TYPE.DISCHARGED);
    } else {
      // Active Customers tab: show customers who are active AND not discharged/transferred/deceased
      filtered = filtered.filter(item => item.status === 'active' && item.type !== CUSTOMER_TYPE.TRANSFERRED && item.type !== CUSTOMER_TYPE.DECEASED && item.type !== CUSTOMER_TYPE.DISCHARGED);
    }
    
    // Tags filter
    if (tagsFilter.length > 0) {
      filtered = filtered.filter(item => {
        if (!item?.tags || item.tags.length === 0) return false;
        return tagsFilter.some(tag => item.tags.includes(tag));
      });
    }
    
    setFilteredCustomers(filtered);
  }, [keyword, customers, showInactive, tagsFilter])

  useEffect(() => {
    const newCustomers = [...customers];
    const sortedCustomers = sorting.key === '' ? newCustomers : newCustomers.sort((a, b) => {
      return a[sorting.key]?.localeCompare(b[sorting.key]);
    });
    setCustomers(
      sorting.order === 'asc' ? sortedCustomers : sortedCustomers.reverse()
    )
  }, [sorting]);

  const getSortingImg = (key) => {
    return sorting.key === key ? (sorting.order === 'asc' ? 'up_arrow' : 'down_arrow') : 'default';
  }

  const sortTableWithField = (key) => {
    if (sorting.key === key) {
      setSorting({key: key, order: sorting.order === 'asc' ? 'desc' : 'asc'});
    } else {
      setSorting({key: key, order: 'asc'});
    }
  }

  const toggleSelectedAllItems = () => {
    if (selectedItems.length === filteredCustomers.length) {
      setSelectedItems([]);
    } else {
      setSelectedItems(filteredCustomers.map(item => item.id));
    }
  }

  const toggleItem  = (id) => {
    if (selectedItems.includes(id)) {
      setSelectedItems(selectedItems.filter(item => item !== id));
    } else {
      setSelectedItems([...selectedItems, id]);
    }
  }

  const showArchive = (value) => {
    setShowInactive(value === 'archivedCustomers');
  }

  const checkSelectAll = () => {
    return selectedItems.length === filteredCustomers.length && filteredCustomers.length > 0;
  }

  const cleanFilterAndClose = () => {
    setTagsFilter([]);
    setShowFilterDropdown(false);
  }

  const FilterAndClose = () => {
    setShowFilterDropdown(false);
  }

  const toggleTagFilter = (tagName) => {
    if (tagsFilter.includes(tagName)) {
      setTagsFilter(tagsFilter.filter(tag => tag !== tagName));
    } else {
      setTagsFilter([...tagsFilter, tagName]);
    }
  }

  const handleColumnsChange = (newColumns) => {
    setColumns(newColumns);
  }

  const goToEdit = (id) => {
    navigate(`/customers/edit/${id}`);
  }

  const goToCreateNew = () => {
    navigate(`/customers`);
  }

  const setTransferValue = (customerId, site) => {
    setTransferMap(prev => ({
      ...prev,
      [customerId]: site
    }));
  }

  const goToView = (id) => {
    navigate(`/customers/${id}`);
  }

  const showProfilePicture = (customer) => {
    setAvatarCustomerName(customer?.name || '');
    setAvatarData(null);
    setAvatarLoading(true);
    setShowAvatarModal(true);
    CustomerService.getAvatar(customer?.id).then((data) => {
      setAvatarData(data.data);
      setAvatarLoading(false);
    }).catch(() => {
      setAvatarLoading(false);
    });
  }

  const closeAvatarModal = () => {
    setShowAvatarModal(false);
    setAvatarData(null);
    setAvatarCustomerName('');
  }

  const table = <div className="list row mb-4">
    <div className="col-md-12" style={{ overflow: 'auto'}}>
      <table className="personnel-info-table"> 
        <thead>
          <tr>
            <th className="th-index">No.</th>
            {
              columns.filter(col => col.show).map((column, index) => <th className="sortable-header" key={index}>
                {column.label}  <span className="float-right" onClick={() => sortTableWithField(column.key)}><img src={`/images/${getSortingImg(column.key)}.png`}></img></span>
              </th>)
            }
          </tr>
        </thead>
        <tbody>
          {
            filteredCustomers.map((customer, index) => <tr key={customer.id}>
              <td className="td-index">{index + 1}</td>
              {columns.find(col => col.key === 'name')?.show && <td style={{ verticalAlign: 'middle' }}>
                <div style={{ display: 'flex', alignItems: 'center', gap: '8px' }}>
                  {AuthService.canViewCustomers() && (
                    customerAvatars[customer.id] && customerAvatars[customer.id] !== false ? (
                      <img 
                        src={`data:image/png;base64, ${customerAvatars[customer.id]}`}
                        alt={customer?.name}
                        onClick={() => showProfilePicture(customer)}
                        style={{ 
                          width: '64px', 
                          height: '64px', 
                          borderRadius: '8px', 
                          objectFit: 'cover', 
                          cursor: 'pointer',
                          flexShrink: 0
                        }}
                      />
                    ) : (
                      <PersonSquare 
                        onClick={() => showProfilePicture(customer)} 
                        size={64} 
                        className="clickable" 
                        style={{ flexShrink: 0, color: '#ccc' }}
                      />
                    )
                  )}
                  {AuthService.canAddOrEditCustomers() && <PencilSquare size={16} className="clickable" onClick={() => isAllCustomersPage ? goToEdit(customer?.id) : goToView(customer?.id)} style={{ flexShrink: 0 }}></PencilSquare>}
                  <span className="clickable" style={{ color: '#0066B1', textDecoration: 'underline', cursor: 'pointer' }} onClick={() => goToView(customer?.id)}>{customer?.name}</span>
                </div>
              </td>}
              {columns.find(col => col.key === 'chinese_name')?.show && <td>{customer?.name_cn}</td>}
              {columns.find(col => col.key === 'email')?.show && <td>{customer?.email}</td>}
              {columns.find(col => col.key === 'type')?.show && <td>{customer?.type}</td>}
              {columns.find(col => col.key === 'pickup_status')?.show && <td>{customer?.pickup_status}</td>}
              {columns.find(col => col.key === 'birth_date')?.show && <td>{customer?.birth_date}</td>}
              {columns.find(col => col.key === 'gender')?.show && <td>{customer?.gender}</td>}
              {columns.find(col => col.key === 'language')?.show && <td>{customer?.language}</td>}
              {columns.find(col => col.key === 'medicare_number')?.show && <td>{customer?.medicare_number}</td>}
              {columns.find(col => col.key === 'medicaid_number')?.show && <td>{customer?.medicaid_number}</td>}
              {columns.find(col => col.key === 'address')?.show && <td>{customer?.address1 || customer?.address2 || customer?.address3 || customer?.address4 || customer?.address5}</td>}
              {columns.find(col => col.key === 'phone')?.show && <td>{customer?.phone || customer?.home_phone || customer?.mobile_phone}</td>}
              {columns.find(col => col.key === 'emergency_contact')?.show && <td>{customer?.emergency_contact}</td>}
              {columns.find(col => col.key === 'tags')?.show && <td>{customer?.tags?.join(', ')}</td>}
            </tr>)
          }
        </tbody>
      </table>
    </div>
  </div>;

  const customFilterMenu = React.forwardRef(
    ({ children, style, className, 'aria-labelledby': labeledBy }, ref) => {
      return (
        <div
          ref={ref}
          style={style}
          className={className}
          aria-labelledby={labeledBy}
        >
          <h6>Filter By</h6>
          <div className="app-main-content-fields-section margin-sm dropdown-container">
            <div className="me-4">
              <div className="field-label">Tags</div>
              <div style={{ maxHeight: '150px', overflowY: 'auto' }}>
                {availableLabels.map((label) => (
                  <div key={label.id} style={{ marginBottom: '5px' }}>
                    <input
                      type="checkbox"
                      id={`tag-${label.id}`}
                      checked={tagsFilter.includes(label.label_name)}
                      onChange={() => toggleTagFilter(label.label_name)}
                    />
                    <label htmlFor={`tag-${label.id}`} style={{ marginLeft: '5px' }}>
                      {label.label_name}
                    </label>
                  </div>
                ))}
              </div>
            </div>
          </div>
          <div className="list row">
            <div className="col-md-12">
              <button className="btn btn-default btn-sm float-right" onClick={() => cleanFilterAndClose()}> Cancel </button>
              <button className="btn btn-primary btn-sm float-right" onClick={() => FilterAndClose()}> Filter </button>
            </div>
          </div>
        </div>
      );
    },
  );

  return (
    <>
      {showSpinner && <div className="spinner-overlay">
        <Spinner animation="border" role="status">
          <span className="visually-hidden">Loading...</span>
        </Spinner>
      </div>}
      {showBreadcrumb && (
        <div className="list row mb-4">
          <Breadcrumb>
            <Breadcrumb.Item href="/">General</Breadcrumb.Item>
            <Breadcrumb.Item active>
              Customer Information
            </Breadcrumb.Item>
          </Breadcrumb>
          <div className="col-md-12 text-primary">
            <h4>{title || 'All Customers'}</h4>
          </div>
        </div>
      )}
      <div className={`app-main-content-list-container ${showBreadcrumb ? 'list-page' : ''}`}>
        <div className="app-main-content-list-func-container">
          <Tabs defaultActiveKey="activeCustomers" id="customers-tab" onSelect={(k) => showArchive(k)}>
            <Tab eventKey="activeCustomers" title="Active Customers">
              {table}
            </Tab>
            <Tab eventKey="archivedCustomers" title="Discharged Customers">
              {table}
            </Tab>
          </Tabs>
          <div className="list-func-panel">
            <input className="me-2 with-search-icon" type="text" placeholder="Search" value={keyword}  onChange={(e) => setKeyword(e.currentTarget.value)} />
            <Dropdown
              key={'filter-customers'}
              id="filter-customers"
              className="me-2"
              show={showFilterDropdown}
              onToggle={(isOpen) => {
                if (isOpen) {
                  setShowManageTableDropdown(false);
                  setShowExportDropdown(false);
                }
                setShowFilterDropdown(isOpen);
              }}
              autoClose={false}
            > 
              <Dropdown.Toggle variant="primary">
                <Filter size={16} className="me-2"></Filter>Filter
              </Dropdown.Toggle>
              <Dropdown.Menu as={customFilterMenu}/> 
            </Dropdown>
            <ManageTable 
              columns={columns} 
              onColumnsChange={handleColumnsChange}
              show={showManageTableDropdown}
              onToggle={(isOpen) => {
                if (isOpen) {
                  setShowFilterDropdown(false);
                  setShowExportDropdown(false);
                }
                setShowManageTableDropdown(isOpen);
              }}
            />
            {typeof additionalButtons === 'function' 
              ? additionalButtons({
                  showExportDropdown,
                  onExportToggle: (isOpen) => {
                    if (isOpen) {
                      setShowFilterDropdown(false);
                      setShowManageTableDropdown(false);
                    }
                    setShowExportDropdown(isOpen);
                  }
                })
              : additionalButtons
            }
          </div>
        </div>
      </div>
      <Modal show={showAvatarModal} onHide={closeAvatarModal} centered>
        <Modal.Header closeButton>
          <Modal.Title style={{ fontSize: '16px' }}>{avatarCustomerName}</Modal.Title>
        </Modal.Header>
        <Modal.Body style={{ display: 'flex', justifyContent: 'center', alignItems: 'center', minHeight: '200px' }}>
          {avatarLoading && <Spinner animation="border" variant="primary" />}
          {!avatarLoading && avatarData && (
            <img 
              src={`data:image/png;base64, ${avatarData}`} 
              alt={avatarCustomerName}
              style={{ maxWidth: '100%', maxHeight: '400px', objectFit: 'contain' }}
            />
          )}
          {!avatarLoading && !avatarData && (
            <div style={{ textAlign: 'center', color: '#999' }}>No profile picture available</div>
          )}
        </Modal.Body>
      </Modal>
    </>
  )
};

export default DashboardCustomersList;