/**
 * Autonomy Manager - Tiered authorization system for L4 self-evolution
 *
 * Provides granular control over what actions the Agent can take autonomously:
 * - Supervised: All actions require user confirmation
 * - Assisted: Low-risk actions execute automatically
 * - Autonomous: Agent decides when to act and notify
 *
 * Security boundaries:
 * - High-risk operations ALWAYS require confirmation
 * - All autonomous actions are logged for audit
 * - One-click rollback to any historical state
 *
 * Reference: ZCLAW_AGENT_INTELLIGENCE_EVOLUTION.md §6.4.3
 */

// === Types ===

export type AutonomyLevel = 'supervised' | 'assisted' | 'autonomous';

export type RiskLevel = 'low' | 'medium' | 'high';

export type ActionType =
  | 'memory_save'
  | 'memory_delete'
  | 'identity_update'
  | 'identity_rollback'
  | 'skill_install'
  | 'skill_uninstall'
  | 'config_change'
  | 'workflow_trigger'
  | 'hand_trigger'
  | 'llm_call'
  | 'reflection_run'
  | 'compaction_run';

export interface AutonomyConfig {
  level: AutonomyLevel;
  allowedActions: {
    memoryAutoSave: boolean;
    identityAutoUpdate: boolean;
    skillAutoInstall: boolean;
    selfModification: boolean;
    autoCompaction: boolean;
    autoReflection: boolean;
  };
  approvalThreshold: {
    importanceMax: number;  // Auto-approve if importance <= this (default: 5)
    riskMax: RiskLevel;     // Auto-approve if risk <= this (default: 'low')
  };
  notifyOnAction: boolean;  // Notify user after autonomous action
  auditLogEnabled: boolean; // Log all autonomous actions
}

export interface AutonomyDecision {
  action: ActionType;
  allowed: boolean;
  requiresApproval: boolean;
  reason: string;
  riskLevel: RiskLevel;
  importance: number;
  timestamp: string;
}

export interface AuditLogEntry {
  id: string;
  action: ActionType;
  decision: AutonomyDecision;
  context: Record<string, unknown>;
  outcome: 'success' | 'failed' | 'rolled_back';
  rolledBackAt?: string;
  timestamp: string;
}

// === Risk Mapping ===

const ACTION_RISK_MAP: Record<ActionType, RiskLevel> = {
  memory_save: 'low',
  memory_delete: 'high',
  identity_update: 'high',
  identity_rollback: 'medium',
  skill_install: 'medium',
  skill_uninstall: 'medium',
  config_change: 'medium',
  workflow_trigger: 'low',
  hand_trigger: 'medium',
  llm_call: 'low',
  reflection_run: 'low',
  compaction_run: 'low',
};

const RISK_ORDER: Record<RiskLevel, number> = {
  low: 1,
  medium: 2,
  high: 3,
};

// === Default Configs ===

export const DEFAULT_AUTONOMY_CONFIGS: Record<AutonomyLevel, AutonomyConfig> = {
  supervised: {
    level: 'supervised',
    allowedActions: {
      memoryAutoSave: false,
      identityAutoUpdate: false,
      skillAutoInstall: false,
      selfModification: false,
      autoCompaction: false,
      autoReflection: false,
    },
    approvalThreshold: {
      importanceMax: 0,
      riskMax: 'low',
    },
    notifyOnAction: true,
    auditLogEnabled: true,
  },
  assisted: {
    level: 'assisted',
    allowedActions: {
      memoryAutoSave: true,
      identityAutoUpdate: false,
      skillAutoInstall: false,
      selfModification: false,
      autoCompaction: true,
      autoReflection: true,
    },
    approvalThreshold: {
      importanceMax: 5,
      riskMax: 'low',
    },
    notifyOnAction: true,
    auditLogEnabled: true,
  },
  autonomous: {
    level: 'autonomous',
    allowedActions: {
      memoryAutoSave: true,
      identityAutoUpdate: true,
      skillAutoInstall: true,
      selfModification: false, // Always require approval for self-modification
      autoCompaction: true,
      autoReflection: true,
    },
    approvalThreshold: {
      importanceMax: 7,
      riskMax: 'medium',
    },
    notifyOnAction: false, // Only notify on high-impact actions
    auditLogEnabled: true,
  },
};

// === Storage ===

const AUTONOMY_CONFIG_KEY = 'zclaw-autonomy-config';
const AUDIT_LOG_KEY = 'zclaw-autonomy-audit-log';

// === Autonomy Manager ===

export class AutonomyManager {
  private config: AutonomyConfig;
  private auditLog: AuditLogEntry[] = [];
  private pendingApprovals: Map<string, AutonomyDecision> = new Map();

  constructor(config?: Partial<AutonomyConfig>) {
    this.config = this.loadConfig();
    if (config) {
      this.config = { ...this.config, ...config };
    }
    this.loadAuditLog();
  }

  // === Decision Making ===

  /**
   * Evaluate whether an action can be executed autonomously.
   */
  evaluate(
    action: ActionType,
    context?: {
      importance?: number;
      riskOverride?: RiskLevel;
      details?: Record<string, unknown>;
    }
  ): AutonomyDecision {
    const importance = context?.importance ?? 5;
    const baseRisk = ACTION_RISK_MAP[action];
    const riskLevel = context?.riskOverride ?? baseRisk;

    // High-risk actions ALWAYS require approval
    const isHighRisk = riskLevel === 'high';
    const isSelfModification = action === 'identity_update' || action === 'selfModification';
    const isDeletion = action === 'memory_delete';

    let allowed = false;
    let requiresApproval = true;
    let reason = '';

    // Determine if action is allowed based on config
    if (isHighRisk || isDeletion) {
      // Always require approval for high-risk and deletion
      allowed = false;
      requiresApproval = true;
      reason = `高风险操作 [${action}] 始终需要用户确认`;
    } else if (isSelfModification && !this.config.allowedActions.selfModification) {
      // Self-modification requires explicit permission
      allowed = false;
      requiresApproval = true;
      reason = `身份修改 [${action}] 需要显式授权`;
    } else {
      // Check against thresholds
      const importanceOk = importance <= this.config.approvalThreshold.importanceMax;
      const riskOk = RISK_ORDER[riskLevel] <= RISK_ORDER[this.config.approvalThreshold.riskMax];
      const actionAllowed = this.isActionAllowed(action);

      if (actionAllowed && importanceOk && riskOk) {
        allowed = true;
        requiresApproval = false;
        reason = `自动批准: 重要性=${importance}, 风险=${riskLevel}`;
      } else if (actionAllowed) {
        allowed = false;
        requiresApproval = true;
        reason = `需要审批: 重要性=${importance}(阈值${this.config.approvalThreshold.importanceMax}), 风险=${riskLevel}(阈值${this.config.approvalThreshold.riskMax})`;
      } else {
        allowed = false;
        requiresApproval = true;
        reason = `操作 [${action}] 未在允许列表中`;
      }
    }

    const decision: AutonomyDecision = {
      action,
      allowed,
      requiresApproval,
      reason,
      riskLevel,
      importance,
      timestamp: new Date().toISOString(),
    };

    // Log the decision
    if (this.config.auditLogEnabled) {
      this.logDecision(decision, context?.details ?? {});
    }

    return decision;
  }

  /**
   * Check if an action type is allowed by current config.
   */
  private isActionAllowed(action: ActionType): boolean {
    const actionMap: Record<ActionType, keyof AutonomyConfig['allowedActions'] | null> = {
      memory_save: 'memoryAutoSave',
      memory_delete: null, // Never auto-allowed
      identity_update: 'identityAutoUpdate',
      identity_rollback: null,
      skill_install: 'skillAutoInstall',
      skill_uninstall: null,
      config_change: null,
      workflow_trigger: 'autoCompaction',
      hand_trigger: null,
      llm_call: 'autoReflection',
      reflection_run: 'autoReflection',
      compaction_run: 'autoCompaction',
    };

    const configKey = actionMap[action];
    if (!configKey) return false;
    return this.config.allowedActions[configKey] ?? false;
  }

  // === Approval Workflow ===

  /**
   * Request approval for an action.
   * Returns approval ID that can be used to approve/reject.
   */
  requestApproval(decision: AutonomyDecision): string {
    const approvalId = `approval_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`;
    this.pendingApprovals.set(approvalId, decision);

    // Store in localStorage for persistence
    this.persistPendingApprovals();

    console.log(`[AutonomyManager] Approval requested: ${approvalId} for ${decision.action}`);
    return approvalId;
  }

  /**
   * Approve a pending action.
   */
  approve(approvalId: string): boolean {
    const decision = this.pendingApprovals.get(approvalId);
    if (!decision) {
      console.warn(`[AutonomyManager] Approval not found: ${approvalId}`);
      return false;
    }

    // Update decision
    decision.allowed = true;
    decision.requiresApproval = false;
    decision.reason = `用户已批准 [${approvalId}]`;

    // Remove from pending
    this.pendingApprovals.delete(approvalId);
    this.persistPendingApprovals();

    // Update audit log
    this.updateAuditLogOutcome(approvalId, 'success');

    console.log(`[AutonomyManager] Approved: ${approvalId}`);
    return true;
  }

  /**
   * Reject a pending action.
   */
  reject(approvalId: string): boolean {
    const decision = this.pendingApprovals.get(approvalId);
    if (!decision) {
      console.warn(`[AutonomyManager] Approval not found: ${approvalId}`);
      return false;
    }

    // Remove from pending
    this.pendingApprovals.delete(approvalId);
    this.persistPendingApprovals();

    // Update audit log
    this.updateAuditLogOutcome(approvalId, 'failed');

    console.log(`[AutonomyManager] Rejected: ${approvalId}`);
    return true;
  }

  /**
   * Get all pending approvals.
   */
  getPendingApprovals(): Array<{ id: string; decision: AutonomyDecision }> {
    return Array.from(this.pendingApprovals.entries()).map(([id, decision]) => ({
      id,
      decision,
    }));
  }

  // === Audit Log ===

  private logDecision(decision: AutonomyDecision, context: Record<string, unknown>): void {
    const entry: AuditLogEntry = {
      id: `audit_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`,
      action: decision.action,
      decision,
      context,
      outcome: decision.allowed ? 'success' : 'failed',
      timestamp: decision.timestamp,
    };

    this.auditLog.push(entry);

    // Keep last 100 entries
    if (this.auditLog.length > 100) {
      this.auditLog = this.auditLog.slice(-100);
    }

    this.saveAuditLog();
  }

  private updateAuditLogOutcome(approvalId: string, outcome: 'success' | 'failed' | 'rolled_back'): void {
    // Find the most recent entry for this action and update outcome
    const entry = this.auditLog.find(e => e.decision.reason.includes(approvalId));
    if (entry) {
      entry.outcome = outcome;
      this.saveAuditLog();
    }
  }

  /**
   * Rollback an action by its audit log ID.
   */
  rollback(auditId: string): boolean {
    const entry = this.auditLog.find(e => e.id === auditId);
    if (!entry) {
      console.warn(`[AutonomyManager] Audit entry not found: ${auditId}`);
      return false;
    }

    if (entry.outcome === 'rolled_back') {
      console.warn(`[AutonomyManager] Already rolled back: ${auditId}`);
      return false;
    }

    // Mark as rolled back
    entry.outcome = 'rolled_back';
    entry.rolledBackAt = new Date().toISOString();
    this.saveAuditLog();

    console.log(`[AutonomyManager] Rolled back: ${auditId}`);
    return true;
  }

  /**
   * Get audit log entries.
   */
  getAuditLog(limit: number = 50): AuditLogEntry[] {
    return this.auditLog.slice(-limit);
  }

  /**
   * Clear audit log.
   */
  clearAuditLog(): void {
    this.auditLog = [];
    this.saveAuditLog();
  }

  // === Config Management ===

  getConfig(): AutonomyConfig {
    return { ...this.config };
  }

  updateConfig(updates: Partial<AutonomyConfig>): void {
    this.config = { ...this.config, ...updates };
    this.saveConfig();
  }

  setLevel(level: AutonomyLevel): void {
    this.config = { ...DEFAULT_AUTONOMY_CONFIGS[level], level };
    this.saveConfig();
    console.log(`[AutonomyManager] Level changed to: ${level}`);
  }

  // === Persistence ===

  private loadConfig(): AutonomyConfig {
    try {
      const raw = localStorage.getItem(AUTONOMY_CONFIG_KEY);
      if (raw) {
        const parsed = JSON.parse(raw);
        return { ...DEFAULT_AUTONOMY_CONFIGS.assisted, ...parsed };
      }
    } catch {
      // Ignore
    }
    return DEFAULT_AUTONOMY_CONFIGS.assisted;
  }

  private saveConfig(): void {
    try {
      localStorage.setItem(AUTONOMY_CONFIG_KEY, JSON.stringify(this.config));
    } catch {
      // Ignore
    }
  }

  private loadAuditLog(): void {
    try {
      const raw = localStorage.getItem(AUDIT_LOG_KEY);
      if (raw) {
        this.auditLog = JSON.parse(raw);
      }
    } catch {
      this.auditLog = [];
    }
  }

  private saveAuditLog(): void {
    try {
      localStorage.setItem(AUDIT_LOG_KEY, JSON.stringify(this.auditLog.slice(-100)));
    } catch {
      // Ignore
    }
  }

  private persistPendingApprovals(): void {
    try {
      const pending = Array.from(this.pendingApprovals.entries());
      localStorage.setItem('zclaw-pending-approvals', JSON.stringify(pending));
    } catch {
      // Ignore
    }
  }
}

// === Singleton ===

let _instance: AutonomyManager | null = null;

export function getAutonomyManager(config?: Partial<AutonomyConfig>): AutonomyManager {
  if (!_instance) {
    _instance = new AutonomyManager(config);
  }
  return _instance;
}

export function resetAutonomyManager(): void {
  _instance = null;
}

// === Helper Functions ===

/**
 * Quick check if an action can proceed autonomously.
 */
export function canAutoExecute(
  action: ActionType,
  importance: number = 5
): { canProceed: boolean; decision: AutonomyDecision } {
  const manager = getAutonomyManager();
  const decision = manager.evaluate(action, { importance });
  return {
    canProceed: decision.allowed && !decision.requiresApproval,
    decision,
  };
}

/**
 * Execute an action with autonomy check.
 * Returns the decision and whether the action was executed.
 */
export async function executeWithAutonomy<T>(
  action: ActionType,
  importance: number,
  executor: () => Promise<T>,
  onApprovalNeeded?: (decision: AutonomyDecision, approvalId: string) => void
): Promise<{ executed: boolean; result?: T; decision: AutonomyDecision; approvalId?: string }> {
  const manager = getAutonomyManager();
  const decision = manager.evaluate(action, { importance });

  if (decision.allowed && !decision.requiresApproval) {
    // Execute immediately
    try {
      const result = await executor();
      return { executed: true, result, decision };
    } catch (error) {
      console.error(`[AutonomyManager] Action ${action} failed:`, error);
      return { executed: false, decision };
    }
  }

  // Need approval
  const approvalId = manager.requestApproval(decision);
  onApprovalNeeded?.(decision, approvalId);

  return { executed: false, decision, approvalId };
}