'use client'

import { useContext, useMemo, useCallback } from 'react'
import { ComplianceContext, type ComplianceContextValue } from './provider'
import type {
  SDKState,
  SDKAction,
  Control,
  Evidence,
  Risk,
  Requirement,
  Obligation,
  TOM,
  ProcessingActivity,
  ConsentPurpose,
} from '@breakpilot/compliance-sdk-types'

// =============================================================================
// MAIN HOOK
// =============================================================================

export function useCompliance(): ComplianceContextValue {
  const context = useContext(ComplianceContext)
  if (!context) {
    throw new Error('useCompliance must be used within ComplianceProvider')
  }
  return context
}

// =============================================================================
// STATE HOOK
// =============================================================================

export function useComplianceState(): SDKState {
  const { state } = useCompliance()
  return state
}

export function useComplianceDispatch(): React.Dispatch<SDKAction> {
  const { dispatch } = useCompliance()
  return dispatch
}

// =============================================================================
// DSGVO HOOKS
// =============================================================================

export function useDSGVO() {
  const { dsgvo, state } = useCompliance()

  return useMemo(
    () => ({
      // DSR
      dsrRequests: state.dsrRequests,
      dsrConfig: state.dsrConfig,
      submitDSR: dsgvo.submitDSR.bind(dsgvo),

      // Consent
      consents: state.consents,
      hasConsent: dsgvo.hasConsent.bind(dsgvo),
      getConsentsByUserId: dsgvo.getConsentsByUserId.bind(dsgvo),

      // VVT
      processingActivities: state.vvt,
      getProcessingActivityById: dsgvo.getProcessingActivityById.bind(dsgvo),

      // DSFA
      dsfa: state.dsfa,
      isDSFARequired: dsgvo.isDSFARequired.bind(dsgvo),

      // TOMs
      toms: state.toms,
      getTOMsByCategory: dsgvo.getTOMsByCategory.bind(dsgvo),
      getTOMScore: dsgvo.getTOMScore.bind(dsgvo),

      // Retention
      retentionPolicies: state.retentionPolicies,
      getUpcomingDeletions: dsgvo.getUpcomingDeletions.bind(dsgvo),

      // Cookie Banner
      cookieBanner: state.cookieBanner,
      generateCookieBannerCode: dsgvo.generateCookieBannerCode.bind(dsgvo),
    }),
    [dsgvo, state]
  )
}

export function useConsent(userId: string) {
  const { dsgvo, state } = useCompliance()

  return useMemo(() => {
    const userConsents = state.consents.filter(c => c.userId === userId)

    return {
      consents: userConsents,
      hasConsent: (purpose: ConsentPurpose) => dsgvo.hasConsent(userId, purpose),
      hasAnalyticsConsent: dsgvo.hasConsent(userId, 'ANALYTICS'),
      hasMarketingConsent: dsgvo.hasConsent(userId, 'MARKETING'),
      hasFunctionalConsent: dsgvo.hasConsent(userId, 'FUNCTIONAL'),
    }
  }, [dsgvo, state.consents, userId])
}

export function useDSR() {
  const { dsgvo, state, dispatch } = useCompliance()

  return useMemo(
    () => ({
      requests: state.dsrRequests,
      config: state.dsrConfig,
      submitRequest: dsgvo.submitDSR.bind(dsgvo),
      pendingRequests: state.dsrRequests.filter(r => r.status !== 'COMPLETED' && r.status !== 'REJECTED'),
      overdueRequests: state.dsrRequests.filter(r => {
        if (r.status === 'COMPLETED' || r.status === 'REJECTED') return false
        return new Date(r.dueDate) < new Date()
      }),
    }),
    [dsgvo, state.dsrRequests, state.dsrConfig]
  )
}

// =============================================================================
// COMPLIANCE HOOKS
// =============================================================================

export function useComplianceModule() {
  const { compliance, state } = useCompliance()

  return useMemo(
    () => ({
      // Controls
      controls: state.controls,
      getControlById: compliance.getControlById.bind(compliance),
      getControlsByDomain: compliance.getControlsByDomain.bind(compliance),
      getControlsByStatus: compliance.getControlsByStatus.bind(compliance),
      controlComplianceRate: compliance.getControlComplianceRate(),

      // Evidence
      evidence: state.evidence,
      getEvidenceByControlId: compliance.getEvidenceByControlId.bind(compliance),
      expiringEvidence: compliance.getExpiringEvidence(),

      // Requirements
      requirements: state.requirements,
      getRequirementsByRegulation: compliance.getRequirementsByRegulation.bind(compliance),
      requirementComplianceRate: compliance.getRequirementComplianceRate(),

      // Obligations
      obligations: state.obligations,
      upcomingObligations: compliance.getUpcomingObligations(),
      overdueObligations: compliance.getOverdueObligations(),

      // AI Act
      aiActClassification: state.aiActClassification,
      aiActRiskCategory: compliance.getAIActRiskCategory(),
      isHighRiskAI: compliance.isHighRiskAI(),

      // Score
      complianceScore: compliance.calculateComplianceScore(),

      // Risks
      risks: state.risks,
      criticalRisks: compliance.getCriticalRisks(),
      averageRiskScore: compliance.getAverageRiskScore(),
    }),
    [compliance, state]
  )
}

export function useControls() {
  const { compliance, state, dispatch } = useCompliance()

  const addControl = useCallback(
    (control: Control) => {
      dispatch({ type: 'ADD_CONTROL', payload: control })
    },
    [dispatch]
  )

  const updateControl = useCallback(
    (id: string, data: Partial<Control>) => {
      dispatch({ type: 'UPDATE_CONTROL', payload: { id, data } })
    },
    [dispatch]
  )

  return useMemo(
    () => ({
      controls: state.controls,
      addControl,
      updateControl,
      getById: compliance.getControlById.bind(compliance),
      getByDomain: compliance.getControlsByDomain.bind(compliance),
      getByStatus: compliance.getControlsByStatus.bind(compliance),
      implementedCount: state.controls.filter(c => c.implementationStatus === 'IMPLEMENTED').length,
      totalCount: state.controls.length,
      complianceRate: compliance.getControlComplianceRate(),
    }),
    [state.controls, compliance, addControl, updateControl]
  )
}

export function useEvidence() {
  const { compliance, state, dispatch } = useCompliance()

  const addEvidence = useCallback(
    (evidence: Evidence) => {
      dispatch({ type: 'ADD_EVIDENCE', payload: evidence })
    },
    [dispatch]
  )

  const updateEvidence = useCallback(
    (id: string, data: Partial<Evidence>) => {
      dispatch({ type: 'UPDATE_EVIDENCE', payload: { id, data } })
    },
    [dispatch]
  )

  const deleteEvidence = useCallback(
    (id: string) => {
      dispatch({ type: 'DELETE_EVIDENCE', payload: id })
    },
    [dispatch]
  )

  return useMemo(
    () => ({
      evidence: state.evidence,
      addEvidence,
      updateEvidence,
      deleteEvidence,
      getByControlId: compliance.getEvidenceByControlId.bind(compliance),
      expiringEvidence: compliance.getExpiringEvidence(),
      activeCount: state.evidence.filter(e => e.status === 'ACTIVE').length,
      totalCount: state.evidence.length,
    }),
    [state.evidence, compliance, addEvidence, updateEvidence, deleteEvidence]
  )
}

export function useRisks() {
  const { compliance, state, dispatch } = useCompliance()

  const addRisk = useCallback(
    (risk: Risk) => {
      dispatch({ type: 'ADD_RISK', payload: risk })
    },
    [dispatch]
  )

  const updateRisk = useCallback(
    (id: string, data: Partial<Risk>) => {
      dispatch({ type: 'UPDATE_RISK', payload: { id, data } })
    },
    [dispatch]
  )

  const deleteRisk = useCallback(
    (id: string) => {
      dispatch({ type: 'DELETE_RISK', payload: id })
    },
    [dispatch]
  )

  return useMemo(
    () => ({
      risks: state.risks,
      addRisk,
      updateRisk,
      deleteRisk,
      criticalRisks: compliance.getCriticalRisks(),
      getByStatus: compliance.getRisksByStatus.bind(compliance),
      getBySeverity: compliance.getRisksBySeverity.bind(compliance),
      averageScore: compliance.getAverageRiskScore(),
    }),
    [state.risks, compliance, addRisk, updateRisk, deleteRisk]
  )
}

// =============================================================================
// RAG HOOKS
// =============================================================================

export function useRAG() {
  const { rag } = useCompliance()

  return useMemo(
    () => ({
      search: rag.search.bind(rag),
      searchByRegulation: rag.searchByRegulation.bind(rag),
      searchByArticle: rag.searchByArticle.bind(rag),
      ask: rag.ask.bind(rag),
      askAboutRegulation: rag.askAboutRegulation.bind(rag),
      explainArticle: rag.explainArticle.bind(rag),
      checkCompliance: rag.checkCompliance.bind(rag),
      getQuickAnswer: rag.getQuickAnswer.bind(rag),
      findRelevantArticles: rag.findRelevantArticles.bind(rag),
      availableRegulations: rag.getAvailableRegulations(),
      chatHistory: rag.getChatHistory(),
      clearChatHistory: rag.clearChatHistory.bind(rag),
      startNewSession: rag.startNewSession.bind(rag),
    }),
    [rag]
  )
}

// =============================================================================
// SECURITY HOOKS
// =============================================================================

export function useSecurity() {
  const { security, state } = useCompliance()

  return useMemo(
    () => ({
      // SBOM
      sbom: state.sbom,
      components: security.getComponents(),
      vulnerableComponents: security.getVulnerableComponents(),
      licenseSummary: security.getLicenseSummary(),

      // Issues
      issues: state.securityIssues,
      openIssues: security.getOpenIssues(),
      criticalIssues: security.getCriticalIssues(),
      getIssuesBySeverity: security.getIssuesBySeverity.bind(security),
      getIssuesByTool: security.getIssuesByTool.bind(security),

      // Backlog
      backlog: state.securityBacklog,
      overdueBacklogItems: security.getOverdueBacklogItems(),

      // Scanning
      startScan: security.startScan.bind(security),
      getScanResult: security.getScanResult.bind(security),
      lastScanResult: security.getLastScanResult(),

      // Summary
      summary: security.getSecuritySummary(),
      securityScore: security.getSecurityScore(),
      availableTools: security.getAvailableTools(),
    }),
    [security, state]
  )
}

// =============================================================================
// NAVIGATION HOOKS
// =============================================================================

export function useSDKNavigation() {
  const {
    currentStep,
    goToStep,
    goToNextStep,
    goToPreviousStep,
    canGoNext,
    canGoPrevious,
    completionPercentage,
    phase1Completion,
    phase2Completion,
    state,
  } = useCompliance()

  return useMemo(
    () => ({
      currentStep,
      currentPhase: state.currentPhase,
      completedSteps: state.completedSteps,
      goToStep,
      goToNextStep,
      goToPreviousStep,
      canGoNext,
      canGoPrevious,
      completionPercentage,
      phase1Completion,
      phase2Completion,
    }),
    [
      currentStep,
      state.currentPhase,
      state.completedSteps,
      goToStep,
      goToNextStep,
      goToPreviousStep,
      canGoNext,
      canGoPrevious,
      completionPercentage,
      phase1Completion,
      phase2Completion,
    ]
  )
}

// =============================================================================
// SYNC HOOKS
// =============================================================================

export function useSync() {
  const { syncState, forceSyncToServer, isOnline, saveState, loadState } = useCompliance()

  return useMemo(
    () => ({
      status: syncState.status,
      lastSyncedAt: syncState.lastSyncedAt,
      pendingChanges: syncState.pendingChanges,
      error: syncState.error,
      isOnline,
      isSyncing: syncState.status === 'syncing',
      hasConflict: syncState.status === 'conflict',
      forceSyncToServer,
      saveState,
      loadState,
    }),
    [syncState, isOnline, forceSyncToServer, saveState, loadState]
  )
}

// =============================================================================
// CHECKPOINT HOOKS
// =============================================================================

export function useCheckpoints() {
  const { validateCheckpoint, overrideCheckpoint, getCheckpointStatus, state } = useCompliance()

  return useMemo(
    () => ({
      checkpoints: state.checkpoints,
      validateCheckpoint,
      overrideCheckpoint,
      getCheckpointStatus,
      passedCheckpoints: Object.values(state.checkpoints).filter(c => c.passed).length,
      totalCheckpoints: Object.keys(state.checkpoints).length,
    }),
    [state.checkpoints, validateCheckpoint, overrideCheckpoint, getCheckpointStatus]
  )
}

// =============================================================================
// EXPORT HOOKS
// =============================================================================

export function useExport() {
  const { exportState } = useCompliance()

  return useMemo(
    () => ({
      exportJSON: () => exportState('json'),
      exportPDF: () => exportState('pdf'),
      exportZIP: () => exportState('zip'),
      exportState,
    }),
    [exportState]
  )
}

// =============================================================================
// COMMAND BAR HOOK
// =============================================================================

export function useCommandBar() {
  const { isCommandBarOpen, setCommandBarOpen } = useCompliance()

  return useMemo(
    () => ({
      isOpen: isCommandBarOpen,
      open: () => setCommandBarOpen(true),
      close: () => setCommandBarOpen(false),
      toggle: () => setCommandBarOpen(!isCommandBarOpen),
    }),
    [isCommandBarOpen, setCommandBarOpen]
  )
}