/**
 * Log message transformation utilities for human-readable display.
 *
 * Transforms technical log messages into user-friendly descriptions
 * while preserving technical details for the expanded view.
 */

/** Function that transforms a log message using details context */
type MessageTransformer = (details: Record<string, string>) => string;

/**
 * Message templates for known log patterns.
 * Keys are matched against the start of log messages (case-insensitive).
 */
const MESSAGE_TEMPLATES: Record<string, MessageTransformer> = {
  // Meeting lifecycle
  'meeting stopped': (d) => {
    const title = d.title || d.meeting_title;
    return title ? `Meeting "${title}" has ended` : 'Meeting has ended';
  },
  'meeting started': (d) => {
    const title = d.title || d.meeting_title;
    return title ? `Started recording "${title}"` : 'Started recording';
  },
  'recording start failed': (d) => {
    const reason = d.error || d.reason;
    return reason ? `Recording failed to start: ${reason}` : 'Recording failed to start';
  },
  'created meeting': (d) => {
    const title = d.title || d.meeting_title;
    return title ? `Created new meeting: ${title}` : 'Created new meeting';
  },
  'meeting deleted': () => 'Meeting deleted successfully',
  stopmeetingrpc: () => 'Meeting recording has been stopped',

  // Cloud consent
  'cloud consent granted': () => 'Cloud AI features enabled',
  'cloud consent revoked': () => 'Cloud AI features disabled',

  // Summarization
  'summary generated': (d) => {
    const model = d.model || d.provider;
    return model ? `Summary ready (${model})` : 'Summary generated successfully';
  },
  summarizing: (d) => {
    const count = d.segment_count || d.segments;
    return count ? `Generating summary from ${count} segments...` : 'Generating summary...';
  },
  'summary generation failed': (d) => {
    const reason = d.error || d.reason;
    return reason ? `Summary generation failed: ${reason}` : 'Summary generation failed';
  },

  // Transcription
  'segment processed': (d) => {
    const { text } = d;
    if (text && text.length > 50) {
      return `Transcribed: "${text.substring(0, 50)}..."`;
    }
    return text ? `Transcribed: "${text}"` : 'Segment transcribed';
  },
  'transcript export completed': (d) => {
    const fmt = d.format;
    return fmt ? `Transcript exported as ${fmt.toUpperCase()}` : 'Transcript exported';
  },
  'starting transcript export': (d) => {
    const fmt = d.format;
    return fmt ? `Exporting transcript as ${fmt.toUpperCase()}...` : 'Exporting transcript...';
  },

  // Diarization
  'diarization job': (d) => {
    const { status } = d;
    if (status === 'completed') {
      return 'Speaker identification complete';
    }
    if (status === 'running' || status === 'processing') {
      return 'Identifying speakers...';
    }
    if (status === 'failed') {
      return 'Speaker identification failed';
    }
    return 'Speaker identification in progress';
  },
  refinespeak: () => 'Refining speaker labels...',
  'speaker renamed': (d) => {
    const from = d.old_name || d.from;
    const to = d.new_name || d.to;
    if (from && to) {
      return `Renamed speaker "${from}" to "${to}"`;
    }
    return 'Speaker renamed';
  },

  // Triggers
  'trigger snooze cleared': () => 'Recording prompt re-enabled',
  'trigger detected': (d) => {
    const type = d.trigger_type || d.type;
    if (type === 'calendar') {
      return 'Calendar meeting starting soon';
    }
    if (type === 'audio') {
      return 'Audio activity detected';
    }
    return 'Recording trigger detected';
  },

  // Webhooks
  webhook_registered: (d) => {
    const name = d.name || d.webhook_name;
    return name ? `Webhook "${name}" registered` : 'Webhook registered';
  },
  webhook_delivered: (d) => {
    const event = d.event_type;
    return event ? `Webhook delivered: ${event}` : 'Webhook delivered successfully';
  },
  webhook_failed: (d) => {
    const reason = d.error;
    return reason ? `Webhook delivery failed: ${reason}` : 'Webhook delivery failed';
  },

  // Calendar
  'calendar sync': (d) => {
    const { provider } = d;
    const count = d.count || d.events_synced;
    if (count) {
      return `Synced ${count} calendar events${provider ? ` from ${provider}` : ''}`;
    }
    return provider ? `Calendar synced with ${provider}` : 'Calendar synced';
  },

  // Entity extraction
  extracted: (d) => {
    const count = d.count || d.entity_count;
    return count ? `Extracted ${count} entities from transcript` : 'Entities extracted';
  },

  // Recovery
  'recovered crashed meeting': () => 'Recovered meeting from unexpected shutdown',
  'crash recovery complete': (d) => {
    const count = d.meetings_recovered || d.count;
    return count ? `Recovery complete: ${count} meeting(s) restored` : 'Recovery complete';
  },

  // Connection
  'connection timeout': () => 'Server connection timed out',
  'connection failed': () => 'Failed to connect to server',
  connected: () => 'Connected to server',
  disconnected: () => 'Disconnected from server',

  // Server
  'server started': (d) => {
    const { port } = d;
    return port ? `Server running on port ${port}` : 'Server started';
  },
  'server stopped': () => 'Server stopped',

  // RPC operations (generic)
  rpc: (d) => {
    const { method, status } = d;
    if (method && status === 'OK') {
      const simpleName = method.split('/').pop() || method;
      return `${simpleName} completed`;
    }
    return 'Operation completed';
  },

  // Audio device management
  'audio device hydration complete': () => 'Audio device settings loaded',
  'audio device prefs synced': () => 'Audio device settings synced',
  'hydration: audio_devices synced': () => 'Audio devices restored from saved settings',
  'loaddevices: stored preferences': () => 'Loaded saved audio device preferences',
  'audio device selected': (d) => {
    const deviceType = d.device_type;
    const deviceName = d.device_name || 'device';
    if (deviceType === 'input') {
      return `Selected microphone: ${deviceName}`;
    }
    if (deviceType === 'output') {
      return `Selected speaker: ${deviceName}`;
    }
    return `Selected audio device: ${deviceName}`;
  },
  'audio device preferences reset': () => 'Audio device settings reset to defaults',
  'skipping output auto-select': () => 'Audio output selection waiting for user choice',

  // Preferences and persistence
  'preferences persistence recovered': () => 'Settings now saving correctly',
  'failed to persist preferences': () => 'Could not save settings to disk',
  'preferences may not persist': () => 'Settings may not be saved when app closes',
  'hydration failed': () => 'Using browser-cached settings (disk settings unavailable)',
  'replacing preferences': () => 'Updating settings',
  'server address override': () => 'Custom server address configured',

  // API and adapter status
  'adapter fallback': () => 'Working in offline mode',
  'event bridge initialization failed': () => 'Event system starting with limited features',
  'tauri stream send_audio_chunk failed': () => 'Audio streaming interrupted',
  'tauri stream stop_recording failed': () => 'Could not stop recording cleanly',
  'stream state force-reset': () => 'Recording state reset',
  'preflight connect failed': () => 'Connection check failed before recording',
  'stream state check failed': () => 'Recording check failed - proceeding with protection',

  // Reconnection
  'server info fetch failed': () => 'Server version check skipped',
  'integration revalidation failed': () => 'Reconnected - some integrations may need refresh',
  'reconnection callback execution failed': () => 'Reconnection partially completed',
  'state sync after reconnect failed': () => 'Sync incomplete after reconnecting',
  'scheduled reconnect attempt failed': (d) => {
    const { attempt } = d;
    return attempt ? `Reconnection attempt ${attempt} failed` : 'Reconnection attempt failed';
  },
  'online event reconnect failed': () => 'Could not reconnect when network came online',
  'initial reconnect attempt failed': () => 'Initial reconnection failed',

  // Security and encryption
  'decryption failed': () => 'Could not decrypt saved data - may need to re-enter API keys',
  'failed to retrieve secure value': () => 'Could not load secure setting',
  'secure storage migration failed': () => 'Secure storage needs recovery - some settings may be lost',
  'secure storage migrated': () => 'Secure storage upgraded successfully',
  'secure storage key mismatch': () => 'Secure storage needs recovery',
  'failed to decrypt api keys': () => 'Could not load saved API keys - please re-enter them',
  'failed to decrypt ai config': () => 'Could not load AI configuration - please re-enter API keys',
  'secure storage write failed': () => 'Could not save secure setting',

  // Storage operations
  'storage write failed': () => 'Could not save setting',
  'storage remove failed': () => 'Could not clear setting',
  'storage clear by prefix': () => 'Could not clear settings group',
  'storage save failed': () => 'Settings saved to memory only (disk save failed)',
  'failed to clear local preferences': () => 'Could not clear local settings cache',

  // Data loading
  'failed to load meeting details': () => 'Could not load meeting details',
  'failed to load recent meetings': () => 'Could not load recent meetings',
  'failed to fetch meeting list': () => 'Could not load meetings list',
  'failed to load tasks': () => 'Could not load tasks from meetings',

  // Notifications and reminders
  'notification permission request failed': () => 'Could not enable notifications',
  'notification creation failed': () => 'Desktop notification failed - showing in-app message',

  // Integration secrets
  'secret retrieval failed': () => 'Could not load integration credentials',
  'secret storage failed': () => 'Could not save integration credentials',
  'secret clearing failed': () => 'Could not remove integration credentials',

  // Cache operations
  'cache event listener error': () => 'Cache update error',
  'meeting cache write failed': () => 'Could not cache meeting data',

  // Sync operations
  'failed to persist preferences sync': () => 'Could not save settings to disk',
  'failed to decode preference key': () => 'Settings key format error',
  'validation event listener error': () => 'Settings validation error',

  // Export
  'tauri path apis unavailable': () => 'Using default download location',

  // App policy
  'recording blocked': () => 'Recording paused - blocked by app policy',

  // Additional backend messages
  'meeting_created': () => 'New meeting has been created in the database',
  'meeting_updated': () => 'Meeting information has been updated',
  'meeting_deleted': () => 'Meeting has been removed from the database',
  'preference_created': () => 'New user preference has been saved',
  'preference_updated': () => 'User preference has been updated',
  'preference_deleted': () => 'User preference has been removed',
  'webhook_delivery_failed': () => 'Webhook notification delivery failed',
  'calendar_list_events_failed': () => 'Unable to retrieve calendar events',
  'oauth_disconnect_success': () => 'Successfully disconnected from external service',
  'oauth_disconnect_failed': () => 'Failed to disconnect from external service',
  'diarization_offline_model_loaded': () => 'Speaker identification model has been loaded',
  'streaming_turns_cleared': () => 'Speaker turn data has been cleared',
  'asr_config_requested_but_no_service': () => 'Audio configuration requested but service is unavailable',

  // Database and infrastructure
  'running database migrations': () => 'Updating database...',
  'project root discovered': () => 'Found project configuration',
  'alembic version table exists': () => 'Checking database for updates',
  'schema check': (d) => {
    const tableCount = d['table count'];
    const versionExists = d['alembic version exists'];
    if (tableCount && versionExists !== undefined) {
      return `Database ready (${tableCount} tables)`;
    }
    return 'Database schema check complete';
  },
  'database connection pool ready': () => 'Database connected',
  'alembic version table exists, checking if migrations needed': () => 'Checking database for updates',
  'running migrations': () => 'Updating database...',
  'applying migrations': () => 'Applying database changes...',
  'migration complete': () => 'Database updated successfully',
  'no migrations needed': () => 'Database is up to date',
  'database initialization complete': () => 'Database setup complete',
  'connection established': () => 'Connected to database',
  'connection closed': () => 'Database connection closed',
  'session started': () => 'Session started',
  'session closed': () => 'Session ended',
  'server initializing': () => 'Starting up...',
  'server ready': () => 'Server is ready',
  'server shutting down': () => 'Server is shutting down',
};

const MESSAGE_ENTRIES = Object.entries(MESSAGE_TEMPLATES).map(([key, transformer]) => ({
  key,
  keyLower: key.toLowerCase(),
  transformer,
}));

/**
 * Transform a technical log message into a friendly, human-readable version.
 *
 * @param message - The original technical log message
 * @param details - Key-value details from the log entry
 * @returns A human-readable message, or the original if no transformation applies
 */
export function toFriendlyMessage(message: string, details: Record<string, string>): string {
  const lowerMessage = message.toLowerCase();

  // Find matching template by checking if message starts with any known key
  for (const entry of MESSAGE_ENTRIES) {
    if (lowerMessage.startsWith(entry.keyLower)) {
      return entry.transformer(details);
    }
  }

  // No match found, return original message with basic cleanup
  return cleanupTechnicalMessage(message);
}

/**
 * Clean up a technical message for display when no template matches.
 * Applies formatting improvements to make messages more human-readable.
 */
function cleanupTechnicalMessage(message: string): string {
  let cleaned = message;

  // Remove [Namespace] prefixes from debug() function output
  // e.g., "[Preferences:Replace] Replacing preferences" → "Replacing preferences"
  cleaned = cleaned.replace(/^\[[^\]]+\]\s*/, '');

  // Remove Namespace: prefixes
  // e.g., "Preferences:Replace: message" → "message"
  cleaned = cleaned.replace(/^[A-Za-z]+:[A-Za-z]+:\s*/, '');

  // Remove common technical prefixes
  cleaned = cleaned
    .replace(/^RPC\s+/i, '')
    .replace(/^gRPC\s+/i, '')
    .replace(/^API\s+/i, '')
    .replace(/^Tauri\s+/i, '')
    .replace(/^TauriAdapter\./i, '');

  // Convert method-style prefixes to readable text
  // e.g., "getPreferences: received" → "Preferences received"
  cleaned = cleaned.replace(
    /^(get|set|load|save|fetch|create|delete|update)([A-Z][a-zA-Z]*):\s*/i,
    (_: string, _verb: string, noun: string) => {
      const readableNoun = noun.replace(/([A-Z])/g, ' $1').trim();
      return `${readableNoun} `;
    }
  );

  // Convert "ENTRY" and similar debug markers to more readable text
  cleaned = cleaned.replace(/:\s*ENTRY$/i, ' started');
  cleaned = cleaned.replace(/:\s*EXIT$/i, ' completed');

  // Remove file extension references
  // e.g., "use-audio-devices.ts MODULE LOADED" → "Audio devices module loaded"
  cleaned = cleaned.replace(/[a-z-]+\.tsx?\s+(MODULE\s+)?LOADED/i, 'Module initialized');

  // Convert snake_case segments to readable text
  // Only for isolated snake_case words, not in the middle of sentences
  cleaned = cleaned.replace(/\b([a-z]+)_([a-z]+)(?:_([a-z]+))?\b/gi, (_match: string, p1: string, p2: string, p3: string | undefined) => {
    const parts = [p1, p2, p3].filter((p): p is string => !!p);
    return parts.map((p: string) => p.charAt(0).toUpperCase() + p.slice(1).toLowerCase()).join(' ');
  });

  // Clean up double spaces
  cleaned = cleaned.replace(/\s+/g, ' ').trim();

  // Capitalize first letter if it's lowercase
  if (cleaned.length > 0 && cleaned[0] === cleaned[0].toLowerCase()) {
    cleaned = cleaned[0].toUpperCase() + cleaned.slice(1);
  }

  return cleaned;
}

/**
 * Check if a message is likely technical and would benefit from the technical view.
 *
 * @param message - The log message to check
 * @returns True if the message appears technical
 */
export function isTechnicalMessage(message: string): boolean {
  const technicalPatterns = [
    /^[A-Z][a-z]+[A-Z]/, // CamelCase
    /^[a-z]+_[a-z]+/, // snake_case
    /\b(?:id|uuid|rpc|grpc|api|http|tcp|udp)\b/i,
    /\b[0-9a-f]{8,}/i, // Long hex strings (UUIDs, hashes)
    /:\s*\d+\s*$/, // Ends with port number
    /\b(?:status|code|err|error)=\w+/i, // Key=value pairs
  ];

  return technicalPatterns.some((pattern) => pattern.test(message));
}

/**
 * Get a summary description for a group of similar log messages.
 *
 * @param message - The common message pattern
 * @param count - Number of occurrences
 * @param details - Details from the first occurrence
 * @returns A summary string describing the group
 */
export function getSummaryMessage(
  message: string,
  count: number,
  details: Record<string, string>
): string {
  const lowerMessage = message.toLowerCase();

  // Segment processing is common and should be summarized specially
  if (lowerMessage.includes('segment')) {
    return `Processed ${count} transcript segments`;
  }

  // Webhook deliveries
  if (lowerMessage.includes('webhook')) {
    return `${count} webhook deliveries`;
  }

  // Generic summary
  const friendlyMessage = toFriendlyMessage(message, details);
  return `${friendlyMessage} (${count}x)`;
}