import { z } from 'zod';
import { reportError } from '@/lib/error-handling';
import { CrudService } from '@/lib/service-base';
import { SERVICE_CONFIGS } from '@/lib/service-config';
import {
  backendOrganizationSchema,
  createOrganizationRequestSchema,
  type BackendOrganization,
  type CreateOrganizationRequest,
} from '@/schemas/backend/organization';

/**
 * Search organizations query parameters schema
 */
export const searchOrganizationsParamsSchema = z.object({
  q: z.string().optional(),
  sectors: z.array(z.string()).optional(),
  sort: z.enum(['name_asc', 'name_desc', 'sector_asc', 'sector_desc']).optional(),
  limit: z.coerce.number().positive().optional(),
  offset: z.coerce.number().nonnegative().optional(),
});

export type SearchOrganizationsParams = z.infer<typeof searchOrganizationsParamsSchema>;

/**
 * Similar organization schema
 */
export const similarOrganizationSchema = z.object({
  id: z.string(),
  name: z.string(),
  sector: z.string(),
  similarity_score: z.number().min(0).max(1),
});

export type SimilarOrganization = z.infer<typeof similarOrganizationSchema>;

/**
 * Search organizations response schema
 */
export const searchOrganizationsResponseSchema = z.object({
  organizations: z.array(backendOrganizationSchema),
  count: z.number().nonnegative(),
  total: z.number().nonnegative(),
});

export type SearchOrganizationsResponse = z.infer<typeof searchOrganizationsResponseSchema>;

/**
 * Similar organizations response schema
 */
export const similarOrganizationsResponseSchema = z.object({
  organizations: z.array(similarOrganizationSchema),
});

export type SimilarOrganizationsResponse = z.infer<typeof similarOrganizationsResponseSchema>;

/**
 * Organizations Service
 * Handles all organization-related API operations with improved reliability and type safety
 */
class OrganizationsService extends CrudService<BackendOrganization, CreateOrganizationRequest> {
  protected entitySchema = backendOrganizationSchema;
  protected createSchema = createOrganizationRequestSchema;
  protected updateSchema = createOrganizationRequestSchema.partial(); // Allow partial updates

  constructor() {
    super(SERVICE_CONFIGS.ORGANIZATIONS);
  }

  /**
   * Get all organizations with enhanced error handling
   */
  async getAllOrganizations(): Promise<BackendOrganization[]> {
      const result = await this.getAll({
        context: 'getAllOrganizations',
        useArrayFallback: true,
      });

      if (!result.success) {
        console.error('[DEBUG] Organization validation failed:', result.error);
        // Temporarily return empty array to see if data flows through
        return [];
      }

      return result.data;
  }

  /**
   * Search organizations using fuzzy search (backend endpoint)
   * @param query - Search query string
   * @param limit - Maximum number of results (default: 50, max: 200)
   */
  async search(query: string, limit: number = 50): Promise<BackendOrganization[]> {
    if (!query.trim()) {
      return [];
    }

    // Use searchOrganizationsResponseSchema since the API returns {organizations, count, total}
    const result = await this.get<SearchOrganizationsResponse>(
      'search',
      searchOrganizationsResponseSchema,
      { q: query.trim(), limit: Math.min(limit, 200) },
      { context: 'searchOrganizations' }
    );

    if (!result.success) {
      reportError(result.error, 'Failed to search organizations');
      return [];
    }

    return result.data?.organizations || [];
  }

  /**
   * Get search suggestions/autocomplete
   * @param query - Search query string
   * @param limit - Maximum number of suggestions (default: 10, max: 50)
   */
  async getSearchSuggestions(query: string, limit: number = 10): Promise<string[]> {
    if (!query.trim()) {
      return [];
    }

    try {
      const endpoint = this.buildEndpoint('suggestions');
      const url = new URL(endpoint, this.config.baseURL);
      url.searchParams.set('q', query.trim());
      url.searchParams.set('limit', Math.min(limit, 50).toString());

      const response = await fetch(url.toString(), {
        method: 'GET',
        headers: {
          'Content-Type': 'application/json',
        },
      });

      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
      }

      const data = await response.json();
      const suggestions = z.array(z.string()).parse(data);
      return suggestions;
    } catch (error) {
      console.error('[OrganizationsService] Failed to get search suggestions:', error);
      return [];
    }
  }

  /**
   * Search organizations with query parameters
   */
  async searchOrganizations(params?: SearchOrganizationsParams): Promise<SearchOrganizationsResponse> {
    const validatedParams = params ? this.validateStrict(searchOrganizationsParamsSchema, params, 'search params') : {};

    // Build query using the new QueryBuilder
    const query = this.createQuery()
      .whenDefined('q', validatedParams.q)
      .when(validatedParams.sectors && validatedParams.sectors.length > 0, (qb) => {
        validatedParams.sectors!.forEach(sector => qb.param('sectors', sector));
        return qb;
      })
      .whenDefined('sort', validatedParams.sort)
      .whenDefined('limit', validatedParams.limit)
      .whenDefined('offset', validatedParams.offset);

    const result = await this.get('search', searchOrganizationsResponseSchema, query.toParams(), {
      context: 'searchOrganizations',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to search organizations'),
        { operation: 'searchOrganizations', params: validatedParams }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get similar organizations
   */
  async getSimilarOrganizations(orgId: string, limit?: number): Promise<SimilarOrganizationsResponse> {
    const query = this.createQuery().whenDefined('limit', limit);

    const result = await this.get(`${orgId}/similar`, similarOrganizationsResponseSchema, query.toParams(), {
      context: `getSimilarOrganizations(${orgId})`,
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch similar organizations'),
        { operation: 'getSimilarOrganizations', orgId, limit }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get organizations for the current user
   */
  async getUserOrganizations(): Promise<BackendOrganization[]> {
    const result = await this.get('/users/me/organizations', this.entitySchema.array(), undefined, {
      context: 'getUserOrganizations',
      useArrayFallback: true,
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch user organizations'),
        { operation: 'getUserOrganizations' }
      );
      throw error;
    }

    return result.data;
  }
}

// Create and export service instance
const organizationsService = new OrganizationsService();

// Export service instance for direct usage
export { organizationsService };

// Export service methods directly for cleaner imports
export const getOrganizations = organizationsService.getAllOrganizations.bind(organizationsService);
export const getOrganizationById = (id: string) => organizationsService.getById(id).then(result => {
  if (!result.success) {
    const error = reportError(
      new Error(result.error?.message || 'Failed to fetch organization'),
      { operation: 'getOrganizationById', id }
    );
    throw error;
  }
  return result.data;
});

export const createOrganization = (request: CreateOrganizationRequest) => organizationsService.create(request).then(result => {
  if (!result.success) {
    const error = reportError(
      new Error(result.error?.message || 'Failed to create organization'),
      { operation: 'createOrganization', request }
    );
    throw error;
  }
  return result.data;
});

export const deleteOrganization = (id: string) => organizationsService.remove(id).then(result => {
  if (!result.success) {
    const error = reportError(
      new Error(result.error?.message || 'Failed to delete organization'),
      { operation: 'deleteOrganization', id }
    );
    throw error;
  }
});

export const searchOrganizations = organizationsService.searchOrganizations.bind(organizationsService);
export const getSimilarOrganizations = organizationsService.getSimilarOrganizations.bind(organizationsService);
export const getUserOrganizations = organizationsService.getUserOrganizations.bind(organizationsService);