// ---------------------------------------------------------------------------
// Event System
// ---------------------------------------------------------------------------

export type EventCategory =
  | 'file'
  | 'content'
  | 'navigation'
  | 'editor'
  | 'vault'
  | 'plugin'
  | 'system';

export type EventType =
  // File events
  | 'file:create'
  | 'file:delete'
  | 'file:rename'
  | 'file:move'
  | 'file:modify'
  // Content events (semantic diffs)
  | 'content:words-changed'
  | 'content:link-added'
  | 'content:link-removed'
  | 'content:tag-added'
  | 'content:tag-removed'
  | 'content:frontmatter-changed'
  | 'content:heading-changed'
  | 'content:embed-added'
  | 'content:embed-removed'
  // Navigation events
  | 'nav:file-open'
  | 'nav:file-close'
  | 'nav:active-leaf-change'
  // Editor events
  | 'editor:change'
  | 'editor:selection'
  | 'editor:paste'
  // Vault structure events
  | 'vault:folder-create'
  | 'vault:folder-delete'
  | 'vault:folder-rename'
  // System events
  | 'system:session-start'
  | 'system:session-end'
  | 'system:baseline-scan'
  | 'system:rescan'
  | 'system:maintenance'
  // Plugin events
  | 'plugin:command-executed'
  // Custom events (from other plugins via API)
  | `custom:${string}`;

export interface LogfireEvent {
  id: string;
  timestamp: number;
  type: EventType;
  category: EventCategory;
  source: string;
  target?: string;
  payload: Record<string, unknown>;
  session: string;
}

// ---------------------------------------------------------------------------
// Category mapping
// ---------------------------------------------------------------------------

const CATEGORY_MAP: Record<string, EventCategory> = {
  file: 'file',
  content: 'content',
  nav: 'navigation',
  editor: 'editor',
  vault: 'vault',
  plugin: 'plugin',
  system: 'system',
  custom: 'plugin',
};

export function categoryForType(type: EventType): EventCategory {
  const prefix = type.split(':')[0];
  return CATEGORY_MAP[prefix] ?? 'system';
}

// ---------------------------------------------------------------------------
// Content Analysis
// ---------------------------------------------------------------------------

export interface ContentSnapshot {
  path: string;
  wordCount: number;
  charCount: number;
  links: string[];
  tags: string[];
  headings: { level: number; text: string }[];
  frontmatter: Record<string, unknown>;
  embeds: string[];
}

export interface ContentDelta {
  wordsAdded: number;
  wordsRemoved: number;
  linksAdded: string[];
  linksRemoved: string[];
  tagsAdded: string[];
  tagsRemoved: string[];
  headingsAdded: { level: number; text: string }[];
  headingsRemoved: { level: number; text: string }[];
  embedsAdded: string[];
  embedsRemoved: string[];
  frontmatterChanged: boolean;
  frontmatterChanges: Record<string, { old: unknown; new: unknown }>;
}

// ---------------------------------------------------------------------------
// Query System
// ---------------------------------------------------------------------------

export type TimeRange =
  | { type: 'relative'; value: 'today' | 'yesterday' | 'this-week' | 'this-month' | 'last-7-days' | 'last-30-days' }
  | { type: 'absolute'; from: number; to: number }
  | { type: 'session'; sessionId?: string };

export interface QueryConfig {
  timeRange: TimeRange;
  eventTypes?: EventType[];
  categories?: EventCategory[];
  filePaths?: string[];
  groupBy?: 'file' | 'type' | 'hour' | 'day' | 'session';
  orderBy?: 'timestamp' | 'count' | 'words';
  orderDirection?: 'asc' | 'desc';
  limit?: number;
}

// ---------------------------------------------------------------------------
// Projections
// ---------------------------------------------------------------------------

export interface ProjectionTemplate {
  id: string;
  name: string;
  description: string;
  enabled: boolean;
  trigger: ProjectionTrigger;
  output: OutputConfig;
  sections: SectionConfig[];
}

export interface ProjectionTrigger {
  type: 'interval' | 'on-session-end' | 'manual' | 'cron';
  interval?: number;
  cron?: string;
}

export interface OutputConfig {
  folder: string;
  filePattern: string;
  mode: 'overwrite' | 'append';
  frontmatter: Record<string, string>;
}

export interface SectionConfig {
  id: string;
  heading: string;
  type: SectionType;
  query: QueryConfig;
  format: FormatConfig;
  enabled: boolean;
}

export type SectionType = 'timeline' | 'table' | 'summary' | 'chart-data' | 'raw-events' | 'custom';

export interface FormatConfig {
  type: 'builtin' | 'custom';
  builtin?: BuiltinFormat;
  customTemplate?: string;
}

export type BuiltinFormat =
  | { name: 'timeline'; showTimestamp: boolean; showPayload: boolean }
  | { name: 'table'; columns: ColumnDef[] }
  | { name: 'summary'; metrics: MetricDef[] }
  | { name: 'metric'; aggregate: 'count' | 'sum' | 'avg' | 'min' | 'max'; field?: string };

export interface ColumnDef {
  header: string;
  value: string;
  align?: 'left' | 'right' | 'center';
}

export interface MetricDef {
  label: string;
  aggregate: 'count' | 'sum' | 'avg' | 'min' | 'max';
  field?: string;
  filter?: Partial<QueryConfig>;
}

// ---------------------------------------------------------------------------
// Settings
// ---------------------------------------------------------------------------

export interface LogfireSettings {
  settingsVersion: number;

  general: {
    logFolder: string;
    enabled: boolean;
    pauseOnStartup: boolean;
  };

  tracking: {
    fileEvents: boolean;
    contentAnalysis: boolean;
    navigation: boolean;
    editorChanges: boolean;
    commandTracking: boolean;
    excludedFolders: string[];
    excludedPatterns: string[];
  };

  projections: {
    templates: ProjectionTemplate[];
  };

  advanced: {
    debounceMs: number;
    flushIntervalMs: number;
    flushThreshold: number;
    retention: RetentionSettings;
    database: DatabaseSettings;
  };
}

export interface RetentionSettings {
  rawEventsDays: number;
  dailyStatsDays: number;
  monthlyStatsForever: boolean;
  neverDeleteTypes: EventType[];
  maintenanceOnStartup: boolean;
}

export interface DatabaseSettings {
  cacheSizeMb: number;
  walMode: boolean;
  mmapSizeMb: number;
}

export const DEFAULT_SETTINGS: LogfireSettings = {
  settingsVersion: 1,

  general: {
    logFolder: 'Logfire',
    enabled: true,
    pauseOnStartup: false,
  },

  tracking: {
    fileEvents: true,
    contentAnalysis: true,
    navigation: true,
    editorChanges: true,
    commandTracking: true,
    excludedFolders: ['.obsidian'],
    excludedPatterns: [],
  },

  projections: {
    templates: [],
  },

  advanced: {
    debounceMs: 3000,
    flushIntervalMs: 5000,
    flushThreshold: 100,
    retention: {
      rawEventsDays: 30,
      dailyStatsDays: 365,
      monthlyStatsForever: true,
      neverDeleteTypes: ['file:create', 'file:delete', 'file:rename'],
      maintenanceOnStartup: true,
    },
    database: {
      cacheSizeMb: 64,
      walMode: true,
      mmapSizeMb: 256,
    },
  },
};

// ---------------------------------------------------------------------------
// API types
// ---------------------------------------------------------------------------

export interface VaultStats {
  eventsTotal: number;
  wordsAdded: number;
  wordsRemoved: number;
  filesCreated: number;
  filesModified: number;
  filesDeleted: number;
  sessionCount: number;
  activeTimeMs: number;
}

export interface FileStats {
  path: string;
  eventsTotal: number;
  wordsAdded: number;
  wordsRemoved: number;
  activeTimeMs: number;
  lastModified: number;
  editSessions: number;
}

// ---------------------------------------------------------------------------
// Utilities
// ---------------------------------------------------------------------------

export function deepMerge<T>(defaults: T, overrides: Partial<T>): T {
  if (
    typeof defaults !== 'object' || defaults === null ||
    typeof overrides !== 'object' || overrides === null
  ) {
    return (overrides ?? defaults) as T;
  }

  const result = { ...defaults } as Record<string, unknown>;
  const src = overrides as Record<string, unknown>;
  const def = defaults as Record<string, unknown>;

  for (const key of Object.keys(src)) {
    const defaultVal = def[key];
    const overrideVal = src[key];

    if (
      defaultVal !== null && defaultVal !== undefined &&
      overrideVal !== null && overrideVal !== undefined &&
      typeof defaultVal === 'object' && !Array.isArray(defaultVal) &&
      typeof overrideVal === 'object' && !Array.isArray(overrideVal)
    ) {
      result[key] = deepMerge(defaultVal, overrideVal);
    } else if (overrideVal !== undefined) {
      result[key] = overrideVal;
    }
  }

  return result as T;
}