/**
 * Fake dependencies for the rectification chat's parameter functions
 * (TASK-rectification-code-split-20260926). The split moved `send`,
 * `submitStructuredChoice` and `acceptCandidate` out of the component into
 * `runRectificationChatTurn`, `runRectificationStructuredChoice` and
 * `runRectificationCandidateAccept`; tests that used to slice those bodies out
 * of the component source now call the functions with these fakes and assert
 * on what they do (requests, abort wiring, transcript, error line).
 */
import type { SetStateAction } from "react";

import type { RenderMessage } from "../src/components/rectification-message-entry.tsx";
import {
  runRectificationChatTurn,
  type RectificationChatTurnDeps,
  type RectificationRunOutcome,
  type RectificationTurnAction,
  type RectificationTurnContinuation,
} from "../src/lib/rectification-chat-turn-run.ts";
import {
  runRectificationStructuredChoice,
  type RectificationStructuredChoiceDeps,
} from "../src/lib/rectification-chat-choice-run.ts";
import {
  runRectificationCandidateAccept,
  type RectificationCandidateAcceptDeps,
} from "../src/lib/rectification-chat-accept-run.ts";
import type { CandidateResult, CurrentQuestionModel } from "../src/lib/rectification-chat-snapshot.ts";
import { parseRectificationCandidateResult } from "../src/lib/rectification-candidate-result.ts";
import type { RectificationChatViewInput } from "../src/lib/rectification-chat-view.ts";
import type { RectificationChoiceCard } from "../src/lib/rectification-agentic/v9/choice-card.ts";

export const RUN_CASE_ID = "44444444-4444-4444-8444-444444444444";
export const RUN_SESSION_ID = "33333333-3333-4333-8333-333333333333";
export const RUN_FOCUS_ID = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaa1";

export type RecordedState<T> = Readonly<{
  get: () => T;
  set: (next: SetStateAction<T>) => void;
}>;

export function recordedState<T>(initial: T): RecordedState<T> {
  let value = initial;
  return {
    get: () => value,
    set: (next) => {
      value = typeof next === "function" ? (next as (current: T) => T)(value) : next;
    },
  };
}

export type FetchCall = Readonly<{ url: string; init: RequestInit | undefined; body: Record<string, unknown> | null }>;

/**
 * Swap `fetch` (and the `window` frame scheduler the stream buffer needs) for
 * the duration of `run`. `respond` sees each call in order.
 */
export async function withFakeFetch<T>(
  respond: (call: FetchCall, index: number) => Response | Promise<Response>,
  run: (calls: FetchCall[]) => Promise<T>,
): Promise<T> {
  const calls: FetchCall[] = [];
  const originalFetch = globalThis.fetch;
  const globals = globalThis as { window?: unknown };
  const originalWindow = globals.window;
  globalThis.fetch = (async (input: RequestInfo | URL, init?: RequestInit) => {
    const body = typeof init?.body === "string" ? JSON.parse(init.body) as Record<string, unknown> : null;
    const call = { url: String(input), init, body };
    calls.push(call);
    return respond(call, calls.length - 1);
  }) as typeof fetch;
  globals.window = {
    requestAnimationFrame: (callback: () => void) => setTimeout(callback, 0),
    cancelAnimationFrame: (handle: ReturnType<typeof setTimeout>) => clearTimeout(handle),
    setTimeout,
    clearTimeout,
  };
  try {
    return await run(calls);
  } finally {
    globalThis.fetch = originalFetch;
    globals.window = originalWindow;
  }
}

export function ndjsonResponse(events: readonly Record<string, unknown>[], init: ResponseInit = {}): Response {
  return new Response(`${events.map((event) => JSON.stringify(event)).join("\n")}\n`, {
    status: 200,
    headers: { "content-type": "application/x-ndjson; charset=utf-8" },
    ...init,
  });
}

export function jsonResponse(payload: unknown, status = 200): Response {
  return new Response(JSON.stringify(payload), {
    status,
    headers: { "content-type": "application/json" },
  });
}

/** Everything the three run functions write, recorded for assertions. */
export function chatRunRecorder(initialMessages: RenderMessage[] = []) {
  const transcript = recordedState<RenderMessage[]>(initialMessages);
  /** Every transcript the run committed, in order (each setMessages call). */
  const messageHistory: RenderMessage[][] = [];
  const messages: RecordedState<RenderMessage[]> = {
    get: transcript.get,
    set: (next) => {
      transcript.set(next);
      messageHistory.push(transcript.get());
    },
  };
  const error = recordedState("");
  const choiceNonce = recordedState(0);
  const nextUserActionId = recordedState<string | null>(null);
  const acceptingCandidateId = recordedState<string | null>(null);
  const candidateResult = recordedState<CandidateResult>(null);
  const savedTime = recordedState<string | null>(null);
  const savedStatus = recordedState<"accepted" | "confirmed" | null>(null);
  const pending: boolean[] = [];
  const liveLabels: string[] = [];
  const snapshotLoads: Array<((turns: readonly unknown[]) => void) | undefined> = [];
  const pins: number[] = [];
  const sends: Array<Readonly<{ action: RectificationTurnAction; messageText: string; continuation?: RectificationTurnContinuation }>> = [];
  const completed: number[] = [];
  const profileIncomplete: number[] = [];
  const billing: Array<{ source?: string } | undefined> = [];
  const messageChanges: unknown[] = [];
  const saved: Array<[string, string]> = [];
  const refs = {
    keyCounter: { current: 0 },
    currentQuestionRef: { current: null as CurrentQuestionModel | null },
    runAbort: { current: null as AbortController | null },
    lastRunOutcome: { current: null as RectificationRunOutcome },
  };
  const shared = {
    caseId: RUN_CASE_ID,
    sessionId: RUN_SESSION_ID,
    busy: false,
    readonly: false,
    ...refs,
    conversationAnchor: { pinLatestTurn: () => { pins.push(Date.now()); } },
    setError: error.set,
    setMessages: messages.set,
    setPending: (value: boolean) => { pending.push(value); },
    beginLiveRun: (label: string) => { liveLabels.push(label); },
    loadCaseSnapshot: async (merge?: (turns: readonly unknown[]) => void) => {
      snapshotLoads.push(merge);
      merge?.([]);
      return undefined;
    },
    send: async (action: RectificationTurnAction, messageText: string, continuation?: RectificationTurnContinuation) => {
      sends.push({ action, messageText, continuation });
    },
    onCompleted: () => { completed.push(1); },
    onProfileIncomplete: () => { profileIncomplete.push(1); },
    onMessagesChange: (next: unknown) => { messageChanges.push(next); },
  };

  function turnDeps(overrides: Partial<RectificationChatTurnDeps> = {}): RectificationChatTurnDeps {
    return {
      ...shared,
      selectedModelId: "model-a",
      conversationReadonly: false,
      rememberLiveActivity: (label: string) => { liveLabels.push(label); return label; },
      onOpenBilling: (options?: { source?: string }) => { billing.push(options); },
      ...overrides,
    };
  }

  function choiceDeps(
    choiceCard: RectificationChoiceCard | null,
    overrides: Partial<RectificationStructuredChoiceDeps> = {},
  ): RectificationStructuredChoiceDeps {
    return {
      ...shared,
      choiceCard,
      currentQuestion: null,
      actionIdForChoice: () => globalThis.crypto.randomUUID(),
      setChoiceNonce: choiceNonce.set,
      setNextUserActionId: nextUserActionId.set,
      ...overrides,
    };
  }

  function acceptDeps(overrides: Partial<RectificationCandidateAcceptDeps> = {}): RectificationCandidateAcceptDeps {
    return {
      ...shared,
      candidateResult: candidateResult.get(),
      acceptingCandidateId: acceptingCandidateId.get(),
      setAcceptingCandidateId: acceptingCandidateId.set,
      setCandidateResult: candidateResult.set,
      setSavedTime: savedTime.set,
      setSavedStatus: savedStatus.set,
      onSaved: (time: string, status: string) => { saved.push([time, status]); },
      ...overrides,
    };
  }

  return {
    messages,
    messageHistory,
    error,
    choiceNonce,
    nextUserActionId,
    acceptingCandidateId,
    candidateResult,
    savedTime,
    savedStatus,
    pending,
    liveLabels,
    snapshotLoads,
    pins,
    sends,
    completed,
    profileIncomplete,
    billing,
    messageChanges,
    saved,
    refs,
    turnDeps,
    choiceDeps,
    acceptDeps,
  };
}

export function fixtureChoiceCard(overrides: Partial<RectificationChoiceCard> = {}): RectificationChoiceCard {
  return {
    question_id: "distinguish:1",
    method_id: "candidate_discriminator",
    prompt: "2023 年前后，有没有换过工作或职责明显变化？",
    why: "",
    varga: null,
    choice_mode: "A/B/C/D",
    options: [
      { key: "A", label: "明确发生且时间吻合" },
      { key: "B", label: "发生过但程度较弱" },
      { key: "C", label: "没有这回事" },
      { key: "D", label: "这段记不清楚" },
    ],
    stop_label: "先这样，先看当前范围",
    stop_message: "",
    scoring: true,
    probe_id: "probe:1",
    case_revision: 3,
    focus_id: RUN_FOCUS_ID,
    ...overrides,
  } as RectificationChoiceCard;
}

export function fixtureCandidateResult(): NonNullable<CandidateResult> {
  return {
    resultId: "result-1",
    candidates: [
      { candidateId: "cand-1", time: "05:07" },
      { candidateId: "cand-2", time: "05:15" },
    ],
    selectedTime: null,
  } as unknown as NonNullable<CandidateResult>;
}

/**
 * Where the stop button's AbortController goes during a tapped choice or an
 * adoption: is the controller in `runAbort` the one whose signal the request
 * carries, and is it cleared once the run ends?
 */
export async function abortWiringOf(kind: "choice" | "accept") {
  const recorder = chatRunRecorder();
  let signalMatchesRunAbort = false;
  let url = "";
  await withFakeFetch((call) => {
    url = call.url;
    signalMatchesRunAbort = Boolean(
      recorder.refs.runAbort.current
      && call.init?.signal === recorder.refs.runAbort.current.signal,
    );
    return jsonResponse({ ok: false }, 500);
  }, async () => {
    if (kind === "choice") {
      await runRectificationStructuredChoice(recorder.choiceDeps(fixtureChoiceCard()), "answer_choice", "A");
    } else {
      recorder.candidateResult.set(fixtureCandidateResult());
      await runRectificationCandidateAccept(recorder.acceptDeps(), "cand-1");
    }
  });
  return {
    url,
    signalMatchesRunAbort,
    runAbortCleared: recorder.refs.runAbort.current === null,
  };
}

/**
 * A result the delivery card may offer: `completed_with_range` with selection
 * allowed, parsed by the real parser (same snapshot shape as
 * rectification-delivery-vs-collect-20260914.test.ts).
 */
export function offerableCandidateResult(overrides: Record<string, unknown> = {}): NonNullable<CandidateResult> {
  const result = parseRectificationCandidateResult({
    resultId: "11111111-1111-4111-8111-111111111111",
    candidates: [
      { candidateId: "88888888-8888-4888-8888-888888888881", rank: 1, time: "04:53", relativeSupport: 16, tiedMinuteCount: 2 },
      { candidateId: "88888888-8888-4888-8888-888888888882", rank: 2, time: "05:00", relativeSupport: 16, tiedMinuteCount: 2 },
    ],
    overallConfidence: "medium",
    selectionAllowed: true,
    canAdopt: false,
    confirmationAllowed: false,
    representativeTime: "04:53",
    selectedTime: null,
    selectionKind: null,
    credibleRange: ["04:48", "05:07"],
    session_outcome: "completed_with_range",
    decisionReceipt: {
      display_allowed: true,
      selection_allowed: true,
      acceptance_allowed: true,
      propose_allowed: true,
      confirmation_allowed: false,
      accept_allowed: true,
      confirm_allowed: false,
    },
    ...overrides,
  });
  if (!result) throw new Error("offerableCandidateResult: parser rejected the fixture");
  return result;
}

export function settledAssistant(renderKey: string, extra: Partial<RenderMessage> = {}): RenderMessage {
  return { role: "assistant", text: `回复 ${renderKey}`, renderKey, state: "settled", ...extra };
}

/** Input for deriveRectificationChatView with a quiet, loaded, idle surface. */
export function chatViewInput(overrides: Partial<RectificationChatViewInput> = {}): RectificationChatViewInput {
  return {
    messages: [],
    busy: false,
    readonly: false,
    shouldStartOpening: false,
    openingRequested: false,
    acceptingCandidateId: null,
    selectionOfferLock: null,
    candidateResult: null,
    currentQuestion: null,
    questionSource: null,
    choiceCard: null,
    caseStatus: null,
    caseSnapshotLoaded: true,
    searchWindow: null,
    caseStage: null,
    nextUserActionId: null,
    interviewStopReason: null,
    interviewSessionOutcome: null,
    questionRetryAttempts: 0,
    savedTime: null,
    ...overrides,
  };
}

export { runRectificationChatTurn, runRectificationStructuredChoice, runRectificationCandidateAccept };