/**
 * The shapes that travel between the server, IndexedDB and the UI.
 *
 * Most bugs in this app have been shape bugs: a field that is sometimes absent,
 * a body cached in the wrong format, a stale object adopted over a fresh one.
 * These types exist to make that class of mistake fail at build time.
 */

/* ── Drawing ── */

export type StrokeTool = "pen" | "highlighter" | "eraser";

export interface Stroke {
  /** Tool the stroke was drawn with. */
  t: StrokeTool;
  /** Colour, `#rrggbb`. */
  c: string;
  /** Width in canonical page units, not pixels. */
  s: number;
  /** Flat `[x0, y0, x1, y1, …]` in canonical page space. */
  p: number[];
}

export interface StrokeDoc {
  v: number;
  /** Canonical page width the points are expressed in. */
  w: number;
  /** Canonical page height. */
  h: number;
  strokes: Stroke[];
  /** Save token — lets the editor recognise its own write coming back. */
  t?: string;
}

/* ── Notes ── */

export type NoteKind = "text" | "pdf";

/** Note metadata, as held in the notes list. */
export interface NoteMeta {
  id: string;
  title: string;
  /** "pdf" notes render a document instead of the text editor. */
  type?: NoteKind;
  /** Attachment holding the PDF, for notes of type "pdf". */
  pdfAttachmentId?: string | null;
  folderId: string | null;
  starred: boolean;
  trashed: boolean;
  createdAt: string;
  updatedAt: string;
  /** Position in the notebook's own order, used when sorting is set to manual. */
  sortOrder?: number;
  /** Set while a note created offline has not reached the server yet. */
  _pendingCreate?: boolean;
}

/** The lazily loaded body of a note. */
export interface NoteContent {
  /** Serialised document: `{"v":2,"doc":…}`, or a v1 `{html,tasks}` string. */
  content: string;
  /** Legacy raster drawing as a data URL, for notes predating vector strokes. */
  drawingData: string | null;
  drawingStrokes: StrokeDoc | null;
  /** Server revision this copy came from, used to spot a stale cache. */
  updatedAt?: string | null;
}

/**
 * How a notebook's notes are ordered.
 *
 * "manual" is the user's own arrangement, kept in each note's `sortOrder`; the
 * rest are derived from the notes themselves and need nothing stored.
 */
export type SortMode = "manual" | "updated" | "oldest" | "created" | "title";

/**
 * A line drawn between notes in a notebook's own order.
 *
 * `order` is "how many notes come before me", so it stays meaningful as the
 * notes around it are renamed, edited or opened.
 */
export interface Separator {
  id: string;
  label: string;
  order: number;
}

export interface Notebook {
  id: string;
  name: string;
  cover: number;
  /** Pattern laid over the colour, chosen separately from it. */
  coverPattern?: number;
  sortOrder: number;
  /** Versions kept per note here; null means the server's default. */
  maxVersions?: number | null;
  /** Null means the app default, newest first. */
  sortMode?: SortMode | null;
  /** Lines drawn between notes in the manual order. */
  separators?: Separator[];
  _pendingCreate?: boolean;
}

/** How the note body is set. Presentation only — the export is unaffected. */
export type NoteFont = "serif" | "sans" | "mono";

export interface UserPreferences {
  noteFont: NoteFont;
}

export interface User {
  id: string;
  username: string;
  displayName: string;
  /** Admins may create, delete and reset the password of other accounts. */
  isAdmin?: boolean;
  /** Interface settings, kept on the account so they follow you to the phone. */
  preferences?: UserPreferences;
  /**
   * How many versions a notebook keeps when it names no number of its own.
   *
   * Sent by the server rather than written into the interface: it is set with
   * `MAX_VERSIONS_PER_NOTE`, and a dialog that said "50" would start lying the
   * day that is changed.
   */
  defaultMaxVersions?: number;
}

/** A user row as the admin panel sees it. */
export interface ManagedUser extends User {
  createdAt: string;
  noteCount: number;
  /** True for the admin doing the looking — they may not delete themselves. */
  isSelf: boolean;
}

/* ── Version history ── */

export type VersionReason = "edit" | "large-deletion" | "drawing" | "drawing-cleared" | "before-restore";

export interface NoteVersionSummary {
  id: number;
  title: string | null;
  device_id: string | null;
  reason: VersionReason | string;
  created_at: string;
  content_size: number | null;
  has_drawing: boolean;
}

export interface NoteVersion {
  id: number;
  title: string | null;
  created_at: string;
  device_id: string | null;
  reason: string;
  content: string;
  drawingStrokes: StrokeDoc | null;
}

/* ── Links ── */

export interface Backlink {
  id: string;
  title: string;
  notebook_id: string | null;
  notebook_name: string | null;
  updated_at: string;
}

export type LinkKind = "note" | "notebook";

export interface LinkTarget {
  id: string;
  label: string;
  kind: LinkKind;
}

/* ── Sync ── */

export type SyncStatus = "synced" | "syncing" | "pending" | "offline" | "error";

/** A change waiting to be pushed to the server. */
export interface QueueEntry {
  queueId: number;
  action: string;
  data: Record<string, unknown>;
  timestamp: number;
  attempts?: number;
  lastError?: string;
}

/* ── Attachments ── */

export interface AttachmentInfo {
  id: string;
  mime: string;
  size: number;
  deduplicated: boolean;
}

/* ── Search ── */

export interface SearchHit {
  id: string;
  score: number;
  /** Excerpt around the first matching term. */
  snippet: string;
}