/**
 * Ideas Page - Built with TablePageTemplate
 * Consistent with Keywords page layout, structure and design
 */

import { useState, useEffect, useMemo, useCallback } from 'react';
import TablePageTemplate from '../../templates/TablePageTemplate';
import {
  fetchContentIdeas,
  createContentIdea,
  updateContentIdea,
  deleteContentIdea,
  bulkDeleteContentIdeas,
  bulkUpdateContentIdeasStatus,
  bulkQueueIdeasToWriter,
  ContentIdea,
  ContentIdeasFilters,
  ContentIdeaCreateData,
  fetchClusters,
  Cluster,
} from '../../services/api';
import FormModal from '../../components/common/FormModal';
import ProgressModal from '../../components/common/ProgressModal';
import { useProgressModal } from '../../hooks/useProgressModal';
import { useToast } from '../../components/ui/toast/ToastContainer';
import { BoltIcon, PlusIcon, DownloadIcon, ListIcon, GroupIcon } from '../../icons';
import { createIdeasPageConfig } from '../../config/pages/ideas.config';
import { useSectorStore } from '../../store/sectorStore';
import { usePageSizeStore } from '../../store/pageSizeStore';
import PageHeader from '../../components/common/PageHeader';
import ModuleNavigationTabs from '../../components/navigation/ModuleNavigationTabs';

export default function Ideas() {
  const toast = useToast();
  const { activeSector } = useSectorStore();
  const { pageSize } = usePageSizeStore();

  // Data state
  const [ideas, setIdeas] = useState<ContentIdea[]>([]);
  const [clusters, setClusters] = useState<Cluster[]>([]);
  const [loading, setLoading] = useState(true);
  
  // Filter state
  const [searchTerm, setSearchTerm] = useState('');
  const [statusFilter, setStatusFilter] = useState('');
  const [clusterFilter, setClusterFilter] = useState('');
  const [structureFilter, setStructureFilter] = useState('');
  const [typeFilter, setTypeFilter] = useState('');
  const [entityTypeFilter, setEntityTypeFilter] = useState(''); // Stage 3: Entity type filter
  const [selectedIds, setSelectedIds] = useState<string[]>([]);
  
  // Pagination state
  const [currentPage, setCurrentPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [totalCount, setTotalCount] = useState(0);
  
  // Sorting state
  const [sortBy, setSortBy] = useState<string>('created_at');
  const [sortDirection, setSortDirection] = useState<'asc' | 'desc'>('desc');
  const [showContent, setShowContent] = useState(false);
  
  // Modal state
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [isEditMode, setIsEditMode] = useState(false);
  const [editingIdea, setEditingIdea] = useState<ContentIdea | null>(null);
  const [formData, setFormData] = useState<ContentIdeaCreateData>({
    idea_title: '',
    description: '',
    content_structure: 'blog_post',
    content_type: 'blog_post',
    target_keywords: '',
    keyword_cluster_id: null,
    status: 'new',
    estimated_word_count: 1000,
  });

  // Progress modal for AI functions
  const progressModal = useProgressModal();

  // Load clusters for filter dropdown
  useEffect(() => {
    const loadClusters = async () => {
      try {
        const data = await fetchClusters({ ordering: 'name' });
        setClusters(data.results || []);
      } catch (error) {
        console.error('Error fetching clusters:', error);
      }
    };
    loadClusters();
  }, []);

  // Load ideas - wrapped in useCallback
  const loadIdeas = useCallback(async () => {
    setLoading(true);
    setShowContent(false);
    try {
      const ordering = sortBy ? `${sortDirection === 'desc' ? '-' : ''}${sortBy}` : '-created_at';
      
      const filters: ContentIdeasFilters = {
        ...(searchTerm && { search: searchTerm }),
        ...(statusFilter && { status: statusFilter }),
        ...(clusterFilter && { keyword_cluster_id: clusterFilter }),
        ...(structureFilter && { content_structure: structureFilter }),
        ...(typeFilter && { content_type: typeFilter }),
        ...(entityTypeFilter && { site_entity_type: entityTypeFilter }), // Stage 3: Entity type filter
        page: currentPage,
        page_size: pageSize,
        ordering,
      };
      
      const data = await fetchContentIdeas(filters);
      setIdeas(data.results || []);
      setTotalCount(data.count || 0);
      setTotalPages(Math.ceil((data.count || 0) / pageSize));
      
      setTimeout(() => {
        setShowContent(true);
        setLoading(false);
      }, 100);
    } catch (error: any) {
      console.error('Error loading ideas:', error);
      toast.error(`Failed to load ideas: ${error.message}`);
      setShowContent(true);
      setLoading(false);
    }
  }, [currentPage, statusFilter, clusterFilter, structureFilter, typeFilter, entityTypeFilter, sortBy, sortDirection, searchTerm, activeSector, pageSize]);

  useEffect(() => {
    loadIdeas();
  }, [loadIdeas]);

  // Listen for site and sector changes and refresh data
  useEffect(() => {
    const handleSiteChange = () => {
      loadIdeas();
    };
    
    const handleSectorChange = () => {
      loadIdeas();
    };
    
    window.addEventListener('siteChanged', handleSiteChange);
    window.addEventListener('sectorChanged', handleSectorChange);
    return () => {
      window.removeEventListener('siteChanged', handleSiteChange);
      window.removeEventListener('sectorChanged', handleSectorChange);
    };
  }, [loadIdeas]);

  // Reset to page 1 when pageSize changes
  useEffect(() => {
    setCurrentPage(1);
  }, [pageSize]);

  // Debounced search
  useEffect(() => {
    const timer = setTimeout(() => {
      if (currentPage === 1) {
        loadIdeas();
      } else {
        setCurrentPage(1);
      }
    }, 500);

    return () => clearTimeout(timer);
  }, [searchTerm, currentPage, loadIdeas]);

  // Handle sorting
  const handleSort = (field: string, direction: 'asc' | 'desc') => {
    setSortBy(field || 'created_at');
    setSortDirection(direction);
    setCurrentPage(1);
  };

  // Bulk status update handler
  const handleBulkUpdateStatus = useCallback(async (ids: string[], status: string) => {
    try {
      const numIds = ids.map(id => parseInt(id));
      await bulkUpdateContentIdeasStatus(numIds, status);
      await loadIdeas();
    } catch (error: any) {
      throw error;
    }
  }, [loadIdeas]);

  // Bulk export handler
  const handleBulkExport = useCallback(async (ids: string[]) => {
    try {
      if (!ids || ids.length === 0) {
        throw new Error('No records selected for export');
      }
      toast.info('Export functionality coming soon');
    } catch (error: any) {
      throw error;
    }
  }, []);

  // Row action handler
  const handleRowAction = useCallback(async (action: string, row: ContentIdea) => {
    if (action === 'queue_to_writer') {
      if (row.status !== 'new') {
        toast.error(`Only ideas with status "new" can be queued. Current status: ${row.status}`);
        return;
      }
      try {
        const result = await bulkQueueIdeasToWriter([row.id]);
        toast.success(`Queue complete: ${result.created_count || 0} task created`);
        await loadIdeas();
      } catch (error: any) {
        toast.error(`Failed to queue idea: ${error.message}`);
      }
    }
  }, [toast, loadIdeas]);

  const handleBulkAction = useCallback(async (action: string, ids: string[]) => {
    if (action === 'queue_to_writer') {
      if (ids.length === 0) {
        toast.error('Please select at least one idea to queue');
        return;
      }
      try {
        const numIds = ids.map(id => parseInt(id));
        const result = await bulkQueueIdeasToWriter(numIds);
        toast.success(`Queue complete: ${result.created_count || 0} tasks created from ${ids.length} ideas`);
        await loadIdeas();
      } catch (error: any) {
        toast.error(`Failed to queue ideas: ${error.message}`);
      }
    } else {
      toast.info(`Bulk action "${action}" for ${ids.length} items`);
    }
  }, [toast, loadIdeas]);

  // Create page config
  const pageConfig = useMemo(() => {
    return createIdeasPageConfig({
      clusters,
      activeSector,
      formData,
      setFormData,
      searchTerm,
      setSearchTerm,
      statusFilter,
      setStatusFilter,
      clusterFilter,
      setClusterFilter,
      structureFilter,
      setStructureFilter,
      typeFilter,
      setTypeFilter,
      setCurrentPage,
    });
  }, [clusters, activeSector, formData, searchTerm, statusFilter, clusterFilter, structureFilter, typeFilter]);

  // Calculate header metrics
  const headerMetrics = useMemo(() => {
    if (!pageConfig?.headerMetrics) return [];
    return pageConfig.headerMetrics.map((metric) => ({
      label: metric.label,
      value: metric.calculate({ ideas, totalCount }),
      accentColor: metric.accentColor,
    }));
  }, [pageConfig?.headerMetrics, ideas, totalCount]);

  const resetForm = useCallback(() => {
    setFormData({
      idea_title: '',
      description: '',
      content_structure: 'blog_post',
      content_type: 'blog_post',
      target_keywords: '',
      keyword_cluster_id: null,
      status: 'new',
      estimated_word_count: 1000,
    });
    setIsEditMode(false);
    setEditingIdea(null);
  }, []);

  // Handle create/edit
  const handleSave = async () => {
    try {
      if (isEditMode && editingIdea) {
        await updateContentIdea(editingIdea.id, formData);
        toast.success('Idea updated successfully');
      } else {
        await createContentIdea(formData);
        toast.success('Idea created successfully');
      }
      setIsModalOpen(false);
      resetForm();
      loadIdeas();
    } catch (error: any) {
      toast.error(`Failed to save: ${error.message}`);
    }
  };

  // Planner navigation tabs
  const plannerTabs = [
    { label: 'Keywords', path: '/planner/keywords', icon: <ListIcon /> },
    { label: 'Clusters', path: '/planner/clusters', icon: <GroupIcon /> },
    { label: 'Ideas', path: '/planner/ideas', icon: <BoltIcon /> },
  ];

  return (
    <>
      <PageHeader 
        title="Content Ideas" 
        badge={{ icon: <BoltIcon />, color: 'orange' }}
      />
      <ModuleNavigationTabs tabs={plannerTabs} />
      <TablePageTemplate
        columns={pageConfig.columns}
        data={ideas}
        loading={loading}
        showContent={showContent}
        filters={pageConfig.filters}
        filterValues={{
          search: searchTerm,
          status: statusFilter,
          keyword_cluster_id: clusterFilter,
          content_structure: structureFilter,
          content_type: typeFilter,
          site_entity_type: entityTypeFilter, // Stage 3: Entity type filter
        }}
        onFilterChange={(key, value) => {
          const stringValue = value === null || value === undefined ? '' : String(value);
          if (key === 'search') {
            setSearchTerm(stringValue);
          } else if (key === 'status') {
            setStatusFilter(stringValue);
            setCurrentPage(1);
          } else if (key === 'keyword_cluster_id') {
            setClusterFilter(stringValue);
            setCurrentPage(1);
          } else if (key === 'content_structure') {
            setStructureFilter(stringValue);
            setCurrentPage(1);
          } else if (key === 'content_type') {
            setTypeFilter(stringValue);
            setCurrentPage(1);
          } else if (key === 'site_entity_type') { // Stage 3: Entity type filter
            setEntityTypeFilter(stringValue);
            setCurrentPage(1);
          }
          setCurrentPage(1);
        }}
        onEdit={(row) => {
          setEditingIdea(row);
          setFormData({
            idea_title: row.idea_title || '',
            description: row.description || '',
            content_structure: row.content_structure || 'blog_post',
            content_type: row.content_type || 'blog_post',
            target_keywords: row.target_keywords || '',
            keyword_cluster_id: row.keyword_cluster_id || null,
            status: row.status || 'new',
            estimated_word_count: row.estimated_word_count || 1000,
          });
          setIsEditMode(true);
          setIsModalOpen(true);
        }}
        onCreate={() => {
          resetForm();
          setIsModalOpen(true);
        }}
        createLabel="Add Idea"
        onCreateIcon={<PlusIcon />}
        onDelete={async (id: number) => {
          await deleteContentIdea(id);
          loadIdeas();
        }}
        onBulkDelete={async (ids: number[]) => {
          const result = await bulkDeleteContentIdeas(ids);
          // Clear selection first
          setSelectedIds([]);
          // Reset to page 1 if we deleted all items on current page
          if (currentPage > 1 && ideas.length <= ids.length) {
            setCurrentPage(1);
          }
          // Always reload data to refresh the table
          await loadIdeas();
          return result;
        }}
        onBulkExport={handleBulkExport}
        onBulkUpdateStatus={handleBulkUpdateStatus}
        onBulkAction={handleBulkAction}
        onRowAction={handleRowAction}
        getItemDisplayName={(row: ContentIdea) => row.idea_title}
        onExport={async () => {
          toast.info('Export functionality coming soon');
        }}
        onExportIcon={<DownloadIcon />}
        selectionLabel="idea"
        pagination={{
          currentPage,
          totalPages,
          totalCount,
          onPageChange: setCurrentPage,
        }}
        selection={{
          selectedIds,
          onSelectionChange: setSelectedIds,
        }}
        sorting={{
          sortBy,
          sortDirection,
          onSort: handleSort,
        }}
        headerMetrics={headerMetrics}
        onFilterReset={() => {
          setSearchTerm('');
          setStatusFilter('');
          setClusterFilter('');
          setStructureFilter('');
          setTypeFilter('');
          setCurrentPage(1);
        }}
      />

      {/* Progress Modal for AI Functions */}
      <ProgressModal
        isOpen={progressModal.isOpen}
        title={progressModal.title}
        percentage={progressModal.progress.percentage}
        status={progressModal.progress.status}
        message={progressModal.progress.message}
        details={progressModal.progress.details}
        taskId={progressModal.taskId || undefined}
        functionId={progressModal.functionId}
        stepLogs={progressModal.stepLogs}
        onClose={() => {
          const wasCompleted = progressModal.progress.status === 'completed';
          progressModal.closeModal();
          // Reload data after modal closes (if completed)
          if (wasCompleted) {
            loadIdeas();
          }
        }}
      />

      {/* Create/Edit Modal */}
      <FormModal
        isOpen={isModalOpen}
        onClose={() => {
          setIsModalOpen(false);
          resetForm();
        }}
        onSubmit={handleSave}
        title={isEditMode ? 'Edit Idea' : 'Add Idea'}
        submitLabel={isEditMode ? 'Update' : 'Create'}
        fields={pageConfig.formFields(clusters)}
      />
    </>
  );
}