/**
 * ContextConfigLoader - Loads and validates context configuration
 *
 * Handles loading settings from file with mode-based filtering for observation types.
 */

import path from 'path';
import { homedir } from 'os';
import { SettingsDefaultsManager } from '../../shared/SettingsDefaultsManager.js';
import { ModeManager } from '../domain/ModeManager.js';
import type { ContextConfig } from './types.js';

/**
 * Load all context configuration settings
 * Priority: ~/.claude-mem/settings.json > env var > defaults
 */
export function loadContextConfig(): ContextConfig {
  const settingsPath = path.join(homedir(), '.claude-mem', 'settings.json');
  const settings = SettingsDefaultsManager.loadFromFile(settingsPath);

  // Always read types/concepts from the active mode definition
  const mode = ModeManager.getInstance().getActiveMode();
  const observationTypes = new Set(mode.observation_types.map(t => t.id));
  const observationConcepts = new Set(mode.observation_concepts.map(c => c.id));

  return {
    totalObservationCount: parseInt(settings.CLAUDE_MEM_CONTEXT_OBSERVATIONS, 10),
    fullObservationCount: parseInt(settings.CLAUDE_MEM_CONTEXT_FULL_COUNT, 10),
    sessionCount: parseInt(settings.CLAUDE_MEM_CONTEXT_SESSION_COUNT, 10),
    showReadTokens: settings.CLAUDE_MEM_CONTEXT_SHOW_READ_TOKENS === 'true',
    showWorkTokens: settings.CLAUDE_MEM_CONTEXT_SHOW_WORK_TOKENS === 'true',
    showSavingsAmount: settings.CLAUDE_MEM_CONTEXT_SHOW_SAVINGS_AMOUNT === 'true',
    showSavingsPercent: settings.CLAUDE_MEM_CONTEXT_SHOW_SAVINGS_PERCENT === 'true',
    observationTypes,
    observationConcepts,
    fullObservationField: settings.CLAUDE_MEM_CONTEXT_FULL_FIELD as 'narrative' | 'facts',
    showLastSummary: settings.CLAUDE_MEM_CONTEXT_SHOW_LAST_SUMMARY === 'true',
    showLastMessage: settings.CLAUDE_MEM_CONTEXT_SHOW_LAST_MESSAGE === 'true',
  };
}