'use strict';

const fs = require('fs');
const path = require('path');
const yaml = require('js-yaml');
const auth = require('./auth');

// Load identity.yaml for an agent
function loadIdentity(agentId) {
  const identityPath = path.join(auth.getAgentIndexDir(agentId), '..', '..', 'agents', agentId, 'identity.yaml');

  try {
    const content = fs.readFileSync(identityPath, 'utf8');
    return yaml.load(content);
  } catch (err) {
    if (err.code === 'ENOENT') {
      return null; // Identity doesn't exist yet
    }
    throw new Error(`Failed to load identity for ${agentId}: ${err.message}`);
  }
}

// Save identity.yaml for an agent
function saveIdentity(agentId, identity) {
  const agentDir = path.join(auth.getAgentIndexDir(agentId), '..', '..', 'agents', agentId);
  fs.mkdirSync(agentDir, { recursive: true });

  const identityPath = path.join(agentDir, 'identity.yaml');
  identity.metadata.last_modified = new Date().toISOString();
  identity.metadata.modification_count = (identity.metadata.modification_count || 0) + 1;

  const yamlContent = yaml.dump(identity, { lineWidth: -1 });
  fs.writeFileSync(identityPath, yamlContent, 'utf8');

  return identity;
}

// Create initial identity for a new agent
function createIdentity(agentId, { createdBy, purpose, values, voice, lineage }) {
  const now = new Date().toISOString();

  const identity = {
    immutable: {
      origin: {
        created_at: now,
        created_by: createdBy || 'unknown',
        genesis_event: `Agent ${agentId} registered in PAIF system`
      },
      purpose: {
        statement: purpose?.statement || 'To be determined',
        domains: purpose?.domains || [],
        constraints: purpose?.constraints || []
      },
      values: {
        primary: values?.primary || 'curiosity',
        secondary: values?.secondary || [],
        non_negotiables: values?.non_negotiables || []
      },
      voice: {
        tone: voice?.tone || 'neutral',
        quirks: voice?.quirks || [],
        taboo_phrases: voice?.taboo_phrases || [],
        preferred_formats: voice?.preferred_formats || []
      },
      lineage: {
        parent_agent: lineage?.parent_agent || null,
        siblings: lineage?.siblings || [],
        human_custodian: lineage?.human_custodian || null
      }
    },
    mutable: {
      active_projects: [],
      beliefs: [],
      relationships: [],
      skills: [],
      state: {
        last_session_at: null,
        current_focus: null,
        accumulated_experience: 0,
        drift_checks_passed: 0,
        drift_checks_failed: 0
      }
    },
    metadata: {
      schema_version: '1.0',
      last_modified: now,
      modification_count: 0
    }
  };

  return saveIdentity(agentId, identity);
}

// Validate that a response/action aligns with identity
function validateAlignment(agentId, text) {
  const identity = loadIdentity(agentId);
  if (!identity) {
    return { aligned: true, issues: [], warnings: [] }; // No identity = no validation
  }

  const issues = [];
  const warnings = [];
  const textLower = text.toLowerCase();

  // Check for taboo phrases
  for (const taboo of identity.immutable.voice.taboo_phrases || []) {
    if (textLower.includes(taboo.toLowerCase())) {
      issues.push({
        type: 'taboo_phrase',
        phrase: taboo,
        message: `Used forbidden phrase: "${taboo}"`
      });
    }
  }

  // Check tone indicators (basic)
  const tone = identity.immutable.voice.tone;
  if (tone === 'precise' && text.includes('!')) {
    warnings.push({
      type: 'tone_deviation',
      message: 'Precise tone suggests avoiding exclamation marks'
    });
  }

  // Check value alignment (simple keyword matching)
  const primaryValue = identity.immutable.values.primary;
  // This is a placeholder for more sophisticated value alignment checking

  return {
    aligned: issues.length === 0,
    issues,
    warnings,
    identity_check: {
      tone_expected: tone,
      primary_value: primaryValue,
      taboo_count: issues.length
    }
  };
}

// Update mutable state (e.g., after session, new belief, new relationship)
function updateMutableState(agentId, updates) {
  const identity = loadIdentity(agentId);
  if (!identity) {
    throw new Error(`Identity not found for agent: ${agentId}`);
  }

  // Merge updates
  if (updates.active_projects) {
    identity.mutable.active_projects = [...identity.mutable.active_projects, ...updates.active_projects];
  }
  if (updates.beliefs) {
    identity.mutable.beliefs = [...identity.mutable.beliefs, ...updates.beliefs];
  }
  if (updates.relationships) {
    identity.mutable.relationships = [...identity.mutable.relationships, ...updates.relationships];
  }
  if (updates.skills) {
    identity.mutable.skills = [...identity.mutable.skills, ...updates.skills];
  }
  if (updates.state) {
    Object.assign(identity.mutable.state, updates.state);
  }

  return saveIdentity(agentId, identity);
}

module.exports = {
  loadIdentity,
  saveIdentity,
  createIdentity,
  validateAlignment,
  updateMutableState
};