// Shared types. Port message shapes mirror interfaces.md exactly — including
// its naming note: Port `type` values are snake_case; the SDK translates
// these into the colon-separated `locqr.on()` event names. This file is the
// extension side only, so it stays in the Port's own snake_case vocabulary.

export type LocqrErrorCode = 'NOT_INSTALLED' | 'NOT_REGISTERED' | 'CERT_INVALID' | 'ACCOUNT_ERROR' | 'RUN_FAILED';

export interface LocqrError {
    code: LocqrErrorCode;
    reason?: string;
    security?: boolean;
}

// --- SDK -> Extension ---

export interface InitMessage {
    type: 'init';
    cert?: string;
}

export interface RequestCredentialMessage {
    type: 'request_credential';
}

export interface AbortMessage {
    type: 'abort';
}

export type SdkMessage = InitMessage | RequestCredentialMessage | AbortMessage;

// --- Extension -> SDK ---

export interface VerificationValidMessage {
    type: 'verification';
    status: 'valid';
    features: string[];
}

export interface VerificationErrorMessage {
    type: 'verification';
    status: 'error';
    error: LocqrError;
}

export type VerificationMessage = VerificationValidMessage | VerificationErrorMessage;

// --- Run lifecycle events, extension -> SDK (unsolicited) ---

export interface Credential {
    username: string;
    password: string;
}

export interface RunStartedMessage {
    type: 'run_started';
}

export interface RunDeliveredMessage {
    type: 'run_delivered';
    credential: Credential;
}

export interface RunErrorEventMessage {
    type: 'run_error';
    error: LocqrError;
}

export type ExtensionToSdkMessage = VerificationMessage | RunStartedMessage | RunDeliveredMessage | RunErrorEventMessage;

// --- Popup -> Background (internal chrome.runtime.sendMessage, distinct
// from the external SDK Port — these never cross to the page). ---

export type PopupActionKind = 'start_run' | 'confirm_pin' | 'abort' | 'retry' | 'dismiss';

export interface PopupActionMessage {
    type: 'popup_action';
    tabId: number;
    action: PopupActionKind;
}

// --- Relay messages (interfaces.md, "Relay messages") ---

export interface RelayKemCiphertextMessage {
    type: 'kem_ciphertext';
    payload_b64: string;
}

export interface RelayCredentialMessage {
    type: 'credential';
    payload_b64: string;
}

export type RelayMessage = RelayKemCiphertextMessage | RelayCredentialMessage;

// --- Run bundle upload (interfaces.md, "Run bundle upload") ---

export interface RunBundleUploadRequest {
    runId: string;
    origin: string;
    x25519_pubkey: string;
    kem_pubkey: string;
}

export interface RunBundleUploadResponse {
    signed_token: string;
    qr_ttl: number;
    max_auto_refresh: number;
    pin_ttl: number;
}

// --- Per-tab state (extension/claude.md's state model) ---

export type CertInvalidReason =
    | 'insecure_origin'
    | 'malformed'
    | 'signature_invalid'
    | 'domain_mismatch'
    | 'expired'
    | 'not_yet_valid';

export type AccountErrorReason = 'rejected' | 'unreachable';

/**
 * Per extension/claude.md's `run_error` classes — `alpha_hash_mismatch` and
 * `pin_mismatch` deliberately excluded (companion-only detections, see that
 * file's `run_error` note). Only `user_abort` is wired up by any code path
 * in this slice; the rest are real and specified but deferred to a
 * follow-up hardening pass (see gui.md's "Open / not yet specified" — same
 * pattern).
 */
export type RunErrorReason = 'ttl_exhausted' | 'pin_timeout' | 'user_abort' | 'backend_unreachable' | 'relay_timeout' | 'relay_error';

export type RunErrorClass = 'security' | 'timeout_user' | 'network';

/**
 * This union (run-phase variants included) is stored in chrome.storage.session
 * for popup reactivity, same mechanism as the verification states — but it
 * only ever carries display-safe data: QR content and PIN digits are
 * already what's shown on screen / scanned by a camera, not secret. The
 * actual keypairs, shared secrets, and run key are a *different* thing —
 * they live only in background/run-secrets.ts's in-memory map and are never
 * serialized anywhere, matching the security invariant that private key
 * material never leaves the service worker (extension/claude.md's Data
 * storage table lists these separately from "Per-tab state machine state"
 * for exactly this reason).
 */
export type TabState =
    | { kind: 'unverified' }
    | { kind: 'not_registered' }
    | { kind: 'cert_invalid'; reason: CertInvalidReason; security: boolean }
    | { kind: 'account_error'; reason: AccountErrorReason }
    | { kind: 'idle'; origin: string; features: string[] }
    | { kind: 'phase_1'; origin: string; features: string[] }
    | { kind: 'phase_2'; origin: string; features: string[]; qrContent: string; qrTtlSeconds: number; phaseStartedAt: number }
    | { kind: 'phase_3'; origin: string; features: string[]; pin: string; pinTtlSeconds: number; phaseStartedAt: number }
    | { kind: 'phase_4'; origin: string; features: string[] }
    | { kind: 'delivered'; origin: string; features: string[] }
    | { kind: 'run_error'; origin: string; features: string[]; reason: RunErrorReason; errorClass: RunErrorClass };