// The user's diagnostics level and the browser log it lets out. Only touches core's req and
// beacon. The streaming itself — what is sent, when, and when it stops — is `lib/diagnostics.ts`.
import type { LogEvent } from "../log";
import type { ServerLogRow } from "./admin";
import { beacon, identityHeaders, req } from "./core";

/** Alap / Részletes / Teljes. The server decides how long a raised level lasts. */
export type DiagnosticsLevel = "INFO" | "DEBUG" | "TRACE";

export interface DiagnosticsState {
  level: DiagnosticsLevel;
  /** When a raised level lapses back to INFO (ISO); null at INFO. */
  until: string | null;
  /** How many days this instance keeps stored log lines — the consent text states it. */
  retention_days: number;
  /** How long a debug session records at most — the start dialog's consent text states it. */
  session_minutes: number;
}

/** Where batches go. The shipper leaves the log lines ABOUT this request out of what it sends, or
 *  every batch would carry the previous batch's request line forever. */
export const DIAGNOSTICS_EVENTS_PATH = "/api/diagnostics/events";

export const diagnosticsApi = {
  setDiagnosticsLevel: (
    level: DiagnosticsLevel,
  ): Promise<{ ok: true; diagnostics: DiagnosticsState }> =>
    req("/api/me/diagnostics", { method: "PUT", body: JSON.stringify({ level }) }),
  // Quiet: a lost batch is not the user's problem to be told about in a dialog.
  sendLogEvents: (events: LogEvent[]): Promise<{ ok: true; stored: number }> =>
    req(
      DIAGNOSTICS_EVENTS_PATH,
      { method: "POST", body: JSON.stringify({ events }) },
      { quiet: true },
    ),
  /** The last batch of a closing tab (keepalive, fire-and-forget). */
  sendLogEventsOnUnload: (events: LogEvent[]): void => beacon(DIAGNOSTICS_EVENTS_PATH, { events }),
};

// --- debug sessions ----------------------------------------------------------------------

/** The two levels a recording can run at — it always records more than the base. */
export type DebugSessionLevel = "DEBUG" | "TRACE";

/** One recording: Start → reproduce → Stop. `until` is the server's cap; past it the session is
 *  over whether or not it was stopped. */
export interface DebugSession {
  id: string;
  level: DebugSessionLevel;
  started_at: string;
  until: string;
  ended_at: string | null;
  ended_reason: "stopped" | "expired" | null;
  /** The issue it was sent as, once sent. */
  issue_url: string | null;
  /** Files a send that stopped half-way has still to deliver (retrying sends only these). */
  pending_files: string[];
  /** Whether the issue's body has still to be edited to show the screenshots it already carries. */
  images_pending: boolean;
  /** Whether a send is under way RIGHT NOW. Every step of a send commits its progress, so without
   *  this a reload or a second tab reads a running send as a failed one. */
  sending: boolean;
  screenshots: number;
  /** The issue being written from it (the composer saves as it goes); null until it first does. */
  draft: DebugDraft | null;
}

/** A saved draft: the rendered text the export and the issue carry, plus the composer's own fields
 *  (`form`, lib/issueDraft `DraftForm`) to reopen it as it was. */
export interface DebugDraft {
  title: string;
  body: string;
  excluded: number[];
  form: Record<string, unknown>;
}

export interface DebugScreenshot {
  id: number;
  mime: string;
  size: number;
  created_at: string;
}

const SESSIONS = "/api/debug-sessions";

export const debugSessionsApi = {
  startDebugSession: (level: DebugSessionLevel): Promise<{ ok: true; session: DebugSession }> =>
    req(SESSIONS, { method: "POST", body: JSON.stringify({ level }) }),
  stopDebugSession: (id: string): Promise<{ ok: true; session: DebugSession }> =>
    req(`${SESSIONS}/${id}/stop`, { method: "POST" }),
  debugSessions: (): Promise<{ items: DebugSession[] }> => req(SESSIONS),
  debugSession: (id: string): Promise<DebugSession> => req(`${SESSIONS}/${id}`),
  /** The rows an issue from this session would carry, browser and server, in time order. */
  debugSessionEvents: (id: string): Promise<{ items: ServerLogRow[]; total: number }> =>
    req(`${SESSIONS}/${id}/events`),
  debugScreenshots: (id: string): Promise<{ items: DebugScreenshot[] }> =>
    req(`${SESSIONS}/${id}/screenshots`),
  /** One image as the raw body — the server checks what it really is, whatever `type` says. */
  addDebugScreenshot: (
    id: string,
    image: Blob,
  ): Promise<{ ok: true; screenshot: DebugScreenshot }> =>
    req(`${SESSIONS}/${id}/screenshots`, {
      method: "POST",
      headers: { "Content-Type": image.type || "application/octet-stream", ...identityHeaders() },
      body: image,
    }),
  saveDebugDraft: (id: string, draft: DebugDraft): Promise<{ ok: true; session: DebugSession }> =>
    req(`${SESSIONS}/${id}/draft`, { method: "PUT", body: JSON.stringify(draft) }),
  /** The report as a zip, built from the SAVED draft — a request, not a navigation, so a refusal
   *  (the export's own pace) reaches the user as a message instead of a saved error page. */
  debugExport: async (id: string): Promise<{ blob: Blob; name: string }> => {
    const r = await req<Response>(`${SESSIONS}/${id}/export`, {}, { raw: true });
    const disposition = r.headers.get("content-disposition") ?? "";
    const name = /filename="([^"]+)"/.exec(disposition)?.[1] ?? `siftlode-debug-${id}.zip`;
    return { blob: await r.blob(), name };
  },
  /** Send the SAVED draft to the issue tracker, or finish a send that stopped half-way. */
  sendDebugIssue: (id: string): Promise<{ ok: true; session: DebugSession }> =>
    req(`${SESSIONS}/${id}/issue`, { method: "POST" }),
  /** The body as the tracker renders it (sanitised HTML — shown in a sandboxed frame only). */
  previewDebugIssue: (id: string, text: string): Promise<{ ok: true; html: string }> =>
    req(`${SESSIONS}/${id}/preview`, { method: "POST", body: JSON.stringify({ text }) }),
  removeDebugScreenshot: (id: string, shotId: number): Promise<{ ok: true; deleted: number }> =>
    req(`${SESSIONS}/${id}/screenshots/${shotId}`, { method: "DELETE" }),
  /** Where an `<img>` loads a screenshot from. */
  debugScreenshotUrl: (id: string, shotId: number): string =>
    `${SESSIONS}/${id}/screenshots/${shotId}`,
};