/**
 * Sector Store (Zustand)
 * Manages the currently selected/active sector for filtering data globally
 * Sectors are scoped under the selected site, so sector selection depends on site selection.
 */
import { create } from 'zustand';
import { persist } from 'zustand/middleware';
import { fetchSiteSectors } from '../services/api';

export interface Sector {
  id: number;
  name: string;
  slug: string;
  site_id: number;
  is_active: boolean;
  industry_sector?: number | null; // IndustrySector ID (FK to IndustrySector template)
}

interface SectorState {
  activeSector: Sector | null;
  sectors: Sector[]; // List of sectors for the current site
  loading: boolean;
  error: string | null;
  
  // Actions
  setActiveSector: (sector: Sector | null) => void;
  loadSectorsForSite: (siteId: number) => Promise<Sector[]>;
  clearActiveSector: () => void;
}

export const useSectorStore = create<SectorState>()(
  persist<SectorState>(
    (set, get) => ({
      activeSector: null,
      sectors: [],
      loading: false,
      error: null,
      
      setActiveSector: (sector) => {
        set({ activeSector: sector, error: null });
        // Ensure sector is persisted immediately
        if (typeof window !== 'undefined') {
          try {
            const state = get();
            localStorage.setItem('sector-storage', JSON.stringify({
              state: { activeSector: sector },
              version: 0
            }));
          } catch (e) {
            console.warn('Failed to persist sector to localStorage:', e);
          }
        }
        // Dispatch event for components to refresh data
        window.dispatchEvent(new CustomEvent('sectorChanged', { detail: { sectorId: sector?.id, siteId: sector?.site_id } }));
      },
      
      loadSectorsForSite: async (siteId: number) => {
        set({ loading: true, error: null });
        try {
          // Don't try to load sectors if siteId is invalid
          if (!siteId) {
            set({ sectors: [], loading: false });
            return [];
          }
          
          const sectorsData = await fetchSiteSectors(siteId);
          const sectors: Sector[] = sectorsData.map((s: any) => ({
            id: s.id,
            name: s.name,
            slug: s.slug,
            site_id: siteId,
            is_active: s.is_active !== false,
            industry_sector: s.industry_sector || null, // Include industry_sector from API
          }));
          
          // Store sectors list in state
          set({ sectors, loading: false });
          
          // Default to "All Sectors" (null) - don't auto-select first sector
          // Only update if current sector belongs to a different site
          const currentSector = get().activeSector;
          if (currentSector && currentSector.site_id !== siteId) {
            // Current sector belongs to different site, reset to null (All Sectors)
            set({ activeSector: null });
            
            // Persist immediately
            if (typeof window !== 'undefined') {
              try {
                localStorage.setItem('sector-storage', JSON.stringify({
                  state: { activeSector: null },
                  version: 0
                }));
              } catch (e) {
                console.warn('Failed to persist sector to localStorage:', e);
              }
            }
            
            // Dispatch event
            window.dispatchEvent(new CustomEvent('sectorChanged', { detail: { sectorId: null, siteId } }));
          } else if (currentSector && currentSector.site_id === siteId) {
            // Verify current sector still exists in the list
            const sectorStillExists = sectors.find(s => s.id === currentSector.id);
            if (!sectorStillExists) {
              // Current sector was deleted, reset to null (All Sectors)
              set({ activeSector: null });
              
              // Persist and dispatch event
              if (typeof window !== 'undefined') {
                try {
                  localStorage.setItem('sector-storage', JSON.stringify({
                    state: { activeSector: null },
                    version: 0
                  }));
                } catch (e) {
                  console.warn('Failed to persist sector to localStorage:', e);
                }
              }
              window.dispatchEvent(new CustomEvent('sectorChanged', { detail: { sectorId: null, siteId } }));
            }
          }
          // If no current sector, keep it as null (All Sectors) - default behavior
          
          return sectors;
        } catch (error: any) {
          // If 403 or 404, the site might be inactive or inaccessible - clear sectors silently
          const isAccessError = error.status === 403 || error.status === 404;
          if (isAccessError) {
            console.warn(`Cannot load sectors for site ${siteId}: site may be inactive or inaccessible`);
            set({ 
              sectors: [],
              activeSector: null, // Clear active sector if site is inaccessible
              loading: false,
              error: null // Don't show error for access issues
            });
            return [];
          }
          
          set({ 
            error: error.message || 'Failed to load sectors',
            loading: false 
          });
          return [];
        }
      },
      
      clearActiveSector: () => {
        set({ activeSector: null, sectors: [], error: null });
        if (typeof window !== 'undefined') {
          try {
            localStorage.setItem('sector-storage', JSON.stringify({
              state: { activeSector: null },
              version: 0
            }));
          } catch (e) {
            console.warn('Failed to persist sector to localStorage:', e);
          }
        }
      },
    }),
    {
      name: 'sector-storage',
      partialize: (state) => ({ 
        activeSector: state.activeSector,
      }),
    }
  )
);