import { apiFetch } from '@szl-holdings/shared-ui/api-fetch';
import type {
  AIBriefing,
  ComplianceAlert,
  ComplianceCertificate,
  EmissionRecord,
  EventLog,
  Fleet,
  ForecastModule,
  MaintenanceLog,
  PortStateDeficiency,
  PredictiveMaintenance,
  SanctionsRiskIndicator,
  ShipmentRecord,
  VesselProfile,
} from './types';

export interface DataProvider {
  getVessels(): Promise<VesselProfile[]>;
  getVessel(id: number): Promise<VesselProfile | undefined>;
  getFleets(): Promise<Fleet[]>;
  getMaintenanceLogs(vesselId?: number): Promise<MaintenanceLog[]>;
  getComplianceCertificates(vesselId?: number): Promise<ComplianceCertificate[]>;
  getPortStateDeficiencies(vesselId?: number): Promise<PortStateDeficiency[]>;
  getShipmentRecords(vesselId?: number): Promise<ShipmentRecord[]>;
  getEventLogs(filters?: {
    severity?: string;
    search?: string;
    vesselId?: number;
  }): Promise<EventLog[]>;
  getEmissionRecords(vesselId?: number): Promise<EmissionRecord[]>;
  getAIBriefings(): Promise<AIBriefing[]>;
  getPredictiveMaintenanceItems(): Promise<PredictiveMaintenance[]>;
  getForecastModules(): Promise<ForecastModule[]>;
  getSanctionsRiskIndicators(): Promise<SanctionsRiskIndicator[]>;
  getComplianceAlerts(): Promise<ComplianceAlert[]>;
  getFleetKPIs(): Promise<FleetKPIs>;
}

export interface FleetKPIs {
  totalVessels: number;
  atSea: number;
  inPort: number;
  anchored: number;
  maintenance: number;
  averageTCE: number;
  averageUtilization: number;
  averageCII: string;
  totalCO2Today: number;
  activeAlerts: number;
  criticalAlerts: number;
  fleetHealthScore: number;
  operationalScore: number;
  complianceScore: number;
  safetyScore: number;
  environmentalScore: number;
}

async function safeFetch<T>(fn: () => Promise<T>, emptyVal: T): Promise<T> {
  try {
    return await fn();
  } catch {
    return emptyVal;
  }
}

class ApiDataProvider implements DataProvider {
  async getVessels(): Promise<VesselProfile[]> {
    return safeFetch(async () => {
      const raw = await apiFetch<VesselProfile[]>('/vessels');
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getVessel(id: number): Promise<VesselProfile | undefined> {
    try {
      const raw = await apiFetch<VesselProfile>(`/vessels/${id}`);
      if (raw) return raw;
    } catch {
      /* fall through */
    }
    return undefined;
  }

  async getFleets(): Promise<Fleet[]> {
    return safeFetch(async () => {
      const raw = await apiFetch<Fleet[]>('/vessels/fleets');
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getMaintenanceLogs(vesselId?: number): Promise<MaintenanceLog[]> {
    return safeFetch(async () => {
      const qs = vesselId ? `?vesselId=${vesselId}` : '';
      const raw = await apiFetch<MaintenanceLog[]>(`/vessels/maintenance${qs}`);
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getComplianceCertificates(vesselId?: number): Promise<ComplianceCertificate[]> {
    return safeFetch(async () => {
      const qs = vesselId ? `?vesselId=${vesselId}` : '';
      const raw = await apiFetch<ComplianceCertificate[]>(`/vessels/certificates${qs}`);
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getPortStateDeficiencies(vesselId?: number): Promise<PortStateDeficiency[]> {
    return safeFetch(async () => {
      const qs = vesselId ? `?vesselId=${vesselId}` : '';
      const raw = await apiFetch<PortStateDeficiency[]>(`/vessels/port-state-deficiencies${qs}`);
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getShipmentRecords(vesselId?: number): Promise<ShipmentRecord[]> {
    return safeFetch(async () => {
      const qs = vesselId ? `?vesselId=${vesselId}` : '';
      const raw = await apiFetch<ShipmentRecord[]>(`/vessels/shipments${qs}`);
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getEventLogs(filters?: {
    severity?: string;
    search?: string;
    vesselId?: number;
  }): Promise<EventLog[]> {
    return safeFetch(async () => {
      const q = new URLSearchParams();
      if (filters?.severity && filters.severity !== 'All') q.set('severity', filters.severity);
      if (filters?.vesselId) q.set('vesselId', String(filters.vesselId));
      if (filters?.search) q.set('search', filters.search);
      const qs = q.toString();
      const raw = await apiFetch<EventLog[]>(`/vessels/event-logs${qs ? `?${qs}` : ''}`);
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getEmissionRecords(vesselId?: number): Promise<EmissionRecord[]> {
    return safeFetch(async () => {
      const qs = vesselId ? `?vesselId=${vesselId}` : '';
      const raw = await apiFetch<EmissionRecord[]>(`/vessels/emissions${qs}`);
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getAIBriefings(): Promise<AIBriefing[]> {
    return safeFetch(async () => {
      const raw = await apiFetch<AIBriefing[]>('/vessels/ai-briefings');
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getPredictiveMaintenanceItems(): Promise<PredictiveMaintenance[]> {
    return safeFetch(async () => {
      const raw = await apiFetch<PredictiveMaintenance[]>('/vessels/predictive-maintenance');
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getForecastModules(): Promise<ForecastModule[]> {
    return safeFetch(async () => {
      const raw = await apiFetch<ForecastModule[]>('/vessels/forecast-modules');
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getSanctionsRiskIndicators(): Promise<SanctionsRiskIndicator[]> {
    return safeFetch(async () => {
      const raw = await apiFetch<SanctionsRiskIndicator[]>('/vessels/sanctions-risk');
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getComplianceAlerts(): Promise<ComplianceAlert[]> {
    return safeFetch(async () => {
      const raw = await apiFetch<ComplianceAlert[]>('/vessels/compliance-alerts');
      return Array.isArray(raw) ? raw : [];
    }, []);
  }

  async getFleetKPIs(): Promise<FleetKPIs> {
    return safeFetch(
      async () => {
        const dashboard = await apiFetch<{
          summary: { totalVessels: number; activeExceptions: number };
          statusDistribution: Array<{ status: string; count: number }>;
        }>('/vessels/dashboard');
        if (!dashboard?.summary)
          return {
            totalVessels: 0,
            atSea: 0,
            inPort: 0,
            anchored: 0,
            maintenance: 0,
            averageTCE: 0,
            averageUtilization: 0,
            averageCII: 'N/A',
            totalCO2Today: 0,
            activeAlerts: 0,
            criticalAlerts: 0,
            fleetHealthScore: 0,
            operationalScore: 0,
            complianceScore: 0,
            safetyScore: 0,
            environmentalScore: 0,
          };
        const get = (status: string) =>
          dashboard.statusDistribution?.find((d) => d.status === status)?.count ?? 0;
        const totalVessels = dashboard.summary.totalVessels ?? 0;
        return {
          totalVessels,
          atSea: get('at_sea'),
          inPort: get('in_port'),
          anchored: get('anchored'),
          maintenance: get('maintenance'),
          averageTCE: 0,
          averageUtilization: 0,
          averageCII: 'B',
          totalCO2Today: 0,
          activeAlerts: dashboard.summary.activeExceptions ?? 0,
          criticalAlerts: 0,
          fleetHealthScore: 0,
          operationalScore: 0,
          complianceScore: 0,
          safetyScore: 0,
          environmentalScore: 0,
        };
      },
      {
        totalVessels: 0,
        atSea: 0,
        inPort: 0,
        anchored: 0,
        maintenance: 0,
        averageTCE: 0,
        averageUtilization: 0,
        averageCII: 'N/A',
        totalCO2Today: 0,
        activeAlerts: 0,
        criticalAlerts: 0,
        fleetHealthScore: 0,
        operationalScore: 0,
        complianceScore: 0,
        safetyScore: 0,
        environmentalScore: 0,
      },
    );
  }
}

export const dataProvider: DataProvider = new ApiDataProvider();