/**
 * TypeScript types mirroring the Rust backend data structures.
 *
 * These are used by the IPC layer and components to maintain
 * type safety across the Tauri boundary.
 */

// -- Backend response types (match Rust structs in commands/mod.rs) --

export interface LoreStatus {
  last_sync: string | null;
  is_healthy: boolean;
  message: string;
  summary: LoreSummaryStatus | null;
}

export interface LoreSummaryStatus {
  open_issues: number;
  authored_mrs: number;
  reviewing_mrs: number;
}

export interface BridgeStatus {
  mapping_count: number;
  pending_count: number;
  suspect_count: number;
  last_sync: string | null;
  last_reconciliation: string | null;
}

export interface SyncResult {
  created: number;
  closed: number;
  skipped: number;
  /** Number of suspect_orphan flags cleared (item reappeared) */
  healed: number;
  /** Error messages from non-fatal errors during sync */
  errors: string[];
}

// -- Structured error types (match Rust error.rs) --

/** Error codes for programmatic handling */
export type McErrorCode =
  | "LORE_UNAVAILABLE"
  | "LORE_UNHEALTHY"
  | "LORE_FETCH_FAILED"
  | "BRIDGE_LOCKED"
  | "BRIDGE_MAP_CORRUPTED"
  | "BRIDGE_SYNC_FAILED"
  | "BEADS_UNAVAILABLE"
  | "BEADS_CREATE_FAILED"
  | "BEADS_CLOSE_FAILED"
  | "IO_ERROR"
  | "INTERNAL_ERROR";

/** Structured error from Tauri IPC commands */
export interface McError {
  code: McErrorCode;
  message: string;
  recoverable: boolean;
}

/** Type guard to check if an error is a structured McError */
export function isMcError(err: unknown): err is McError {
  return (
    typeof err === "object" &&
    err !== null &&
    "code" in err &&
    "message" in err &&
    "recoverable" in err
  );
}

/** Result from the quick_capture command */
export interface CaptureResult {
  bead_id: string;
}

// -- Frontend-only types --

/** The type of work item surfaced in the Focus View */
export type FocusItemType = "mr_review" | "issue" | "mr_authored" | "manual";

/** A single work item that can be THE ONE THING */
export interface FocusItem {
  /** Unique key matching bridge mapping (e.g., "mr_review:g/p:847") */
  id: string;
  /** Human-readable title */
  title: string;
  /** Type badge to display */
  type: FocusItemType;
  /** Project path (e.g., "platform/core") */
  project: string;
  /** URL to open in browser (GitLab link) */
  url: string;
  /** Entity IID (e.g., MR !847, Issue #42) */
  iid: number;
  /** ISO timestamp of last update */
  updatedAt: string | null;
  /** Optional context quote (e.g., reviewer comment) */
  contextQuote: string | null;
  /** Who is requesting attention */
  requestedBy: string | null;
}

/** Action the user takes on a focused item */
export type FocusAction = "start" | "defer_1h" | "defer_tomorrow" | "skip";

/** An entry in the decision log */
export interface DecisionEntry {
  timestamp: string;
  action: FocusAction;
  itemId: string;
  reason: string | null;
}

/** Staleness level derived from item age */
export type Staleness = "fresh" | "normal" | "amber" | "urgent";

// -- Inbox types --

/** Type of work item in the inbox */
export type InboxItemType = "mention" | "mr_feedback" | "review_request" | "assignment" | "manual";

/** A work item awaiting triage in the inbox */
export interface InboxItem {
  /** Unique identifier */
  id: string;
  /** Human-readable title */
  title: string;
  /** Type of inbox item */
  type: InboxItemType;
  /** Whether this item has been triaged */
  triaged: boolean;
  /** When the item was created/arrived */
  createdAt: string;
  /** Optional snippet/preview */
  snippet?: string;
  /** Source project */
  project?: string;
  /** Web URL for opening in browser */
  url?: string;
  /** Who triggered this item (e.g., commenter name) */
  actor?: string;
}

/** Triage action the user can take on an inbox item */
export type TriageAction = "accept" | "defer" | "archive";

/** Duration options for deferring an item */
export type DeferDuration = "1h" | "3h" | "tomorrow" | "next_week";

/** Compute staleness from an ISO timestamp */
export function computeStaleness(updatedAt: string | null): Staleness {
  if (!updatedAt) return "normal";

  const ageMs = Date.now() - new Date(updatedAt).getTime();
  const ageDays = ageMs / (1000 * 60 * 60 * 24);

  if (ageDays < 1) return "fresh";
  if (ageDays < 3) return "normal";
  if (ageDays < 7) return "amber";
  return "urgent";
}