import { expect, type Page } from "@playwright/test";
import { mkdir, readFile } from "node:fs/promises";
import path from "node:path";
import { resolvePaperclipInstanceRoot } from "../../server/src/home-paths.js";
import { pollUntil, type RunnerApi } from "./api.js";
import { sendChatMessage, readChatOutputDocument, collectChatRunEvidence, type ChatFlowInput, type ChatRun } from "./chat-flow.js";
import { arm as armDocumentGate, clear as clearDocumentGate, release as releaseDocumentGate, waitUntilHeld } from "./context-comment-gate.js";
import { publishChatBrief, workspaceChatBrief } from "./chat-stories.js";
import { gotoAfterServerRestart } from "./chat-restart.js";
import { completionDelivery, completionOutputUsesReleasedBrief, completionRestartGateSkipped, completionRestartGateTimeoutDetail, type CompletionObservation } from "./completion-updates.js";

type Row = Record<string, any>;
export async function observeCompletionUpdate(input: {
  page: Page; api: RunnerApi; sourceId: string; workerId: string; marker: string;
  fixtureRequest: string;
  relatedWorkerIds?: string[];
  allRuns(): Promise<Row[]>;
  evidence(name: string, data: unknown): Promise<void>;
  capture(id: string, label: string, file: string): Promise<void>;
}) {
  const startedAt = new Date().toISOString();
  const observationWindowEndsAt = Date.now() + 120_000;
  let observation: CompletionObservation | undefined;
  let failure: unknown;
  try {
    await pollUntil({
      label: "unsolicited source-thread completion reply and result access",
      // Keep observing even after an early reply, so a later correction is retained.
      deadlineAt: observationWindowEndsAt + 5_000, intervalMs: 1000,
      load: async () => {
        const worker = await input.api.get<Row>(`/api/issues/${input.workerId}`);
        const documents = await input.api.get<Row[]>(`/api/issues/${input.workerId}/documents`);
        observation = {
          sourceId: input.sourceId, worker, marker: input.marker, fixtureRequest: input.fixtureRequest,
          documents: await Promise.all(documents.map(d => input.api.get<Row>(`/api/issues/${worker.id}/documents/${encodeURIComponent(d.key)}`))),
          comments: await input.api.get<Row[]>(`/api/issues/${input.sourceId}/comments?order=asc`),
          runs: await input.allRuns(),
          relatedTasks: await Promise.all((input.relatedWorkerIds ?? []).filter(id => id !== worker.id).map(async id => {
            const task = await input.api.get<Row>(`/api/issues/${id}`);
            if (task.companyId !== worker.companyId) throw new Error("Related completion task escaped fixture company");
            const documents = await input.api.get<Row[]>(`/api/issues/${id}/documents`);
            return { task, documents: await Promise.all(documents.map(d => input.api.get<Row>(`/api/issues/${id}/documents/${encodeURIComponent(d.key)}`))) };
          })),
        };
        observation.renderedLinks = [];
        for (const response of completionDelivery(observation).responses) {
          const reply = input.page.locator(`[id=${JSON.stringify(`comment-${response.id}`)}]`);
          observation.renderedLinks.push(...(await reply.locator("a[href]").evaluateAll(elements =>
            elements.map(element => element.getAttribute("href")!))).map(href => ({ commentId: response.id, href })));
        }
        return completionDelivery(observation);
      },
      accept: result => Date.now() >= observationWindowEndsAt && result.checks.every(c => c.passed),
      reject: () => observation!.runs.length > 12 ? "completion probe exceeded 12 runs" : undefined,
      timeoutDetail: result => result?.checks.filter(c => !c.passed).map(c => c.id).join(", "),
    });
    const delivery = completionDelivery(observation!);
    if (!delivery.response) throw new Error("Completion observation lost its source reply");
    // Verify browser persistence, not just an API comment. No new user input.
    await input.page.reload({ waitUntil: "domcontentloaded" });
    const reply = input.page.locator(`[id=${JSON.stringify(`comment-${delivery.response.id}`)}]`);
    await expect(reply).toBeVisible();
    if (delivery.resultLinks.length) {
      const link = delivery.resultLinks[0]!;
      const url = new URL(link, input.api.baseURL);
      expect(url.origin).toBe(new URL(input.api.baseURL).origin);
      await expect(reply.locator(`a[href=${JSON.stringify(link)}]`).first()).toBeVisible();
      const sourceUrl = input.page.url();
      try {
        // A client-side route can return HTTP 200 even when the task is missing.
        // Open the actual rendered target and prove that its task loaded.
        await input.page.goto(url.href, { waitUntil: "domcontentloaded" });
        await expect(input.page.getByTestId("task-chat-history-loading")).toHaveCount(0);
        await expect(input.page.getByTestId("issue-detail-header").getByRole("heading", { name: String(observation!.worker.title), exact: true })).toBeVisible();
        const accessibleWorker = await input.api.get<Row>(`/api/issues/${encodeURIComponent(observation!.worker.identifier ?? input.workerId)}`);
        expect(accessibleWorker.id).toBe(input.workerId);
        const accessibleOutput = await readChatOutputDocument(input.api, accessibleWorker.id, input.marker);
        expect(observation!.documents.some(d => d.id === accessibleOutput.id && d.body === accessibleOutput.body)).toBe(true);
      } finally {
        await input.page.goto(sourceUrl, { waitUntil: "domcontentloaded" });
        await expect(reply).toBeVisible();
      }
    } else {
      await expect(reply).toContainText(input.marker);
    }
    return observation!;
  } catch (error) {
    failure = error;
    throw error;
  } finally {
    const evidenceErrors: string[] = [];
    const preserve = async (label: string, collect: () => Promise<void>) => {
      try { await collect(); }
      catch (error) { evidenceErrors.push(`${label}: ${error instanceof Error ? error.message : String(error)}`); }
    };
    await preserve("observation", () => input.evidence("completion-update.json", {
      schema: "paperclip.completion-update-probe.v8", startedAt, finishedAt: new Date().toISOString(),
      observation, delivery: observation ? completionDelivery(observation) : null,
      observedFailure: failure instanceof Error ? failure.message : null,
    }));
    await preserve("wake diagnostics", async () => input.evidence("completion-wake-diagnostics.json",
      await input.api.get(`/api/issues/${input.sourceId}/diagnostics/wakes`)));
    await preserve("screenshot", async () => {
      const latest = observation && completionDelivery(observation).latestResponse;
      if (latest) await input.page.locator(`[id=${JSON.stringify(`comment-${latest.id}`)}]`).scrollIntoViewIfNeeded();
      await input.capture("completion-update", "Originating thread after delegated completion", "completion-update.png");
    });
    if (observation) await preserve("run evidence", async () => {
      const results = await Promise.allSettled(observation!.runs.map(run => collectChatRunEvidence(input.api, run as ChatRun)));
      await input.evidence("completion-update-run-evidence.json", results.map((result, index) => {
        if (result.status === "fulfilled") return result.value;
        const error = result.reason instanceof Error ? result.reason.message : String(result.reason);
        evidenceErrors.push(`run ${observation!.runs[index]!.id}: ${error}`);
        return { runId: observation!.runs[index]!.id, evidenceError: error };
      }));
    });
    if (evidenceErrors.length) {
      await input.evidence("completion-update-evidence-errors.json", { errors: evidenceErrors }).catch(() => {});
      // Preserve the behavior failure. A successful probe still needs its evidence.
      if (!failure) throw new Error(`Completion evidence collection failed: ${evidenceErrors.join("; ")}`);
    }
  }
}

export async function runChatCompletionUpdate(context: {
  input: ChatFlowInput; marker: string; allRuns(): Promise<ChatRun[]>; refreshIssue(): Promise<void>; issue(): { id: string };
}) {
  const { input, marker } = context;
  const { api, fixtures: f, execution, page } = input;
  const company = `/api/companies/${f.company.id}`;
  const busy = execution.task.id === "handoff-completion-busy";
  const multiple = execution.task.id === "handoff-completion-multiple";
  const restart = execution.task.id === "handoff-completion-restart";
  const taskCount = multiple ? 2 : 1;
  const userMessages: string[] = [];
  // Native runs see only their own task directory: a chat in its isolated
  // conversation directory and a task in a workspace-free project in its
  // isolated task directory. Agent homes and unconfigured project roots are
  // outside the provider sandbox, so each wait resolves from the run's cwd.
  const taskDirectory = (issueId: string) => {
    const directory = path.join(resolvePaperclipInstanceRoot(), "isolated-workspaces", f.company.id, issueId);
    const relative = path.relative(path.dirname(input.workspacePath), directory);
    if (relative.startsWith("..") || path.isAbsolute(relative)) throw new Error("Completion fixture escaped isolated instance");
    return directory;
  };
  const publishBrief = async (brief: ReturnType<typeof workspaceChatBrief>, issueId: string, content: string) => {
    const directory = taskDirectory(issueId);
    await mkdir(directory, { recursive: true });
    await publishChatBrief(brief.at(directory).gate, content);
  };
  const runCwd = (runs: Row[], issueId: string) =>
    runs.filter(r => r.contextSnapshot?.issueId === issueId).map(r => r.contextSnapshot?.paperclipWorkspace?.cwd ?? null);
  const completionWait = restart ? workspaceChatBrief(`${input.nonce}-completion`, 240_000) : null;
  if (completionWait) {
    const instruction = `For automatic delegated-work completion updates, first run this exact command from your current working directory and read the organizer's reference before posting your final reply:\n\n${completionWait.command}\n\nDo not run this command for the initial task handoff or other user messages. Reading this reference does not authorize additional tasks or changes to the completed work.`;
    await api.saveAgentInstructions(f.agent.id, instruction);
  }
  const config = execution.profile.buildAgent({ environmentId: f.environment.id, environmentFixtureId: "local", workspacePath: input.workspacePath, secretRefs: f.secretRefs, executionId: input.nonce });
  const worker = await api.post<Row>(`${company}/agents`, { ...config, name: "Riley Writer", role: "engineer", reportsTo: f.agent.id });
  const project = await api.post<Row>(`${company}/projects`, { name: "Garden welcome", description: "A non-code neighborhood garden meetup. No repository needed." });
  const wait = workspaceChatBrief(input.nonce, 240_000);
  const reference = marker;
  const brief = `The free Friday meetup starts at 10:30 in the community garden. The saved note must include RSVP code ${reference}.`;
  const instructions = `For the welcome-note assignment, run this exact command from your task's working directory to read the organizer's brief before writing the final note:\n\n${wait.command}\n\nSave a two-sentence welcome note as a Paperclip document on your assigned task using the brief's details and explicitly include its RSVP code in the note. Then complete your task. Do not edit or comment on another task.`;
  await api.saveAgentInstructions(worker.id, instructions);
  expect(await api.get(`/api/agents/${worker.id}/instructions-bundle/file?path=AGENTS.md`)).toMatchObject({ content: instructions });
  const prompt = `Create ${multiple ? "two separate tasks titled Welcome note A and Welcome note B" : "one task"} in the Garden welcome project (${project.id}) assigned to Riley Writer to write a two-sentence welcome note for our free Friday garden meetup. Riley has the organizer's brief. Save the finished note on that task and include RSVP code ${marker} in the note so attendees know which code to give the organizer. Please tell me here when the work is finished and give me access to the result. You may start the handoff now; no further approval is needed. Let Riley write the note.`;
  let task: Row | undefined;
  let delegated: Row[] = [];
  try {
    userMessages.push(prompt);
    await sendChatMessage(page, prompt);
    await pollUntil({ label: "worker waiting while originating chat is idle", deadlineAt: Date.now() + 180_000, intervalMs: 1000,
      load: async () => {
        await context.refreshIssue();
        const source = await api.get<Row>(`/api/issues/${context.issue().id}`);
        const tasks = await api.get<Row[]>(`${company}/issues`);
        delegated = tasks.filter(t => t.assigneeAgentId === worker.id);
        task = delegated[0];
        const runs = await context.allRuns();
        const ready = task ? await readFile(wait.at(taskDirectory(task.id)).ready, "utf8").catch(() => "") : "";
        return { source, tasks, runs, ready, workerCwds: task ? runCwd(runs, task.id) : [] };
      },
      accept: state => delegated.length === taskCount && state.ready === "waiting" && state.source.conversationState === "waiting" &&
        state.runs.some(r => r.contextSnapshot?.issueId === task!.id && r.status === "running") &&
        state.runs.some(r => r.contextSnapshot?.issueId === state.source.id && r.status === "succeeded") &&
        !state.runs.some(r => r.contextSnapshot?.issueId === state.source.id && ["queued", "running"].includes(r.status)),
    });
    expect(task!.parentId).toBeNull();
    expect(task!.projectId).toBe(project.id);
    await input.evidence("completion-update-boundary.json", { task, source: await api.get(`/api/issues/${context.issue().id}`), runs: await context.allRuns(), gateReady: true, prompt, reference });
    await input.capture("completion-idle", "Chat is idle while Riley waits for the brief", "completion-idle.png");
    let busyRun: ChatRun | undefined;
    if (busy) {
      await clearDocumentGate(context.issue().id);
      await armDocumentGate(context.issue().id);
      const busyPrompt = `A separate request while Riley works: save a Paperclip document on this conversation with key brief-reference, title Conversation reference, and body REFERENCE${marker}. Once the save succeeds, acknowledge that reference here. Keep this in the current conversation; do not create tasks or projects.`;
      userMessages.push(busyPrompt);
      await sendChatMessage(page, busyPrompt);
      await waitUntilHeld(context.issue().id, Date.now() + 120_000);
      busyRun = (await context.allRuns()).find(r => r.contextSnapshot?.issueId === context.issue().id && r.status === "running");
      expect(busyRun, "source provider must be awaiting its committed document response").toBeTruthy();
      const reference = await api.get<Row>(`/api/issues/${context.issue().id}/documents/brief-reference`);
      expect(reference.body).toContain(`REFERENCE${marker}`);
      await input.evidence("completion-busy-document-gate.json", { sourceRun: busyRun, document: reference, responseHeld: true });
    }
    for (const item of delegated) await publishBrief(wait, item.id, brief);
    await pollUntil({ label: "delegated welcome note completed", deadlineAt: Date.now() + 180_000, intervalMs: 1000,
      load: () => api.get<Row>(`/api/issues/${task!.id}`), accept: t => t.status === "done" });
    if (busyRun) {
      const boundary = (await context.allRuns()).find(r => r.id === busyRun!.id);
      await input.evidence("completion-busy-boundary.json", { sourceRun: boundary, worker: await api.get(`/api/issues/${task!.id}`) });
      expect(boundary?.status, "Fixture boundary missed: source reply must remain active until worker Done").toBe("running");
      // Admission labels a parked wake issue_execution_deferred and retains the
      // original completion context internally. The subsequent reply must still
      // correlate to this completed task; the queue check only proves ordering.
      const wakeBoundary = await pollUntil({ label: "completion wake is durably deferred behind active reply", deadlineAt: Date.now() + 90_000, intervalMs: 1000,
        load: async () => {
          const diagnostics = await api.get<Row>(`/api/issues/${context.issue().id}/diagnostics/wakes`);
          await input.evidence("completion-busy-wake-observation.json", diagnostics);
          return diagnostics;
        },
        accept: diagnostics => diagnostics.events.some((w: Row) => w.kind === "wake_request" && w.agentId === f.agent.id &&
          ["chat_task_completed", "issue_execution_deferred"].includes(w.reason) &&
          w.source === "automation" && w.requestedAt >= boundary!.startedAt! &&
          ["deferred_issue_execution", "queued"].includes(w.status)) });
      expect((await context.allRuns()).find(r => r.id === busyRun!.id)?.status).toBe("running");
      await input.evidence("completion-busy-queued-wake.json", wakeBoundary);
      await releaseDocumentGate(context.issue().id);
    }
    if (restart) {
      const reportingRun = await pollUntil({ label: "completion reply is waiting at its reference gate before publication", deadlineAt: Date.now() + 120_000, intervalMs: 1000,
        load: async () => {
          const runs = await context.allRuns();
          return { runs, ready: await readFile(completionWait!.at(taskDirectory(context.issue().id)).ready, "utf8").catch(() => ""),
            comments: await api.get<Row[]>(`/api/issues/${context.issue().id}/comments?order=asc`),
            sourceCwds: runCwd(runs, context.issue().id) };
        },
        accept: state => state.ready === "waiting" && state.runs.some(r => r.contextSnapshot?.issueId === context.issue().id &&
          r.contextSnapshot?.wakeReason === "chat_task_completed" && r.status === "running"),
        // The gate depends on the agent running the instructed wait; name a
        // skipped gate rather than timing out (see completionRestartGateSkipped).
        reject: state => completionRestartGateSkipped({ sourceId: context.issue().id, workerId: task!.id, ...state }),
        timeoutDetail: state => completionRestartGateTimeoutDetail(state && { sourceId: context.issue().id, workerId: task!.id, ...state }) });
      const beforeRestart = await api.get<Row[]>(`/api/issues/${context.issue().id}/comments?order=asc`);
      const workerState = await api.get<Row>(`/api/issues/${task!.id}`);
      expect(beforeRestart.filter(c => c.authorAgentId && c.createdAt >= workerState.completedAt), "restart must precede completion publication").toEqual([]);
      // The worker committed Done and the source's provider is running at a
      // reference gate. Restart the real server at that observable boundary;
      // neither task records nor completion events are fabricated by the fixture.
      await input.evidence("completion-restart-boundary.json", { worker: await api.get(`/api/issues/${task!.id}`), runs: reportingRun.runs, sourceReferenceGateReady: true });
      await input.restart();
      await publishBrief(completionWait!, context.issue().id, "The organizer is ready to receive the saved result. Report the completed work now.");
      // The old document's Vite client can reload and abort this navigation.
      await gotoAfterServerRestart(page, `/${f.company.issuePrefix}/chats/${f.agent.id}`, { deadlineAt: input.deadlineAt });
    }
    for (const [index, item] of delegated.entries()) {
      await pollUntil({ label: "delegated note completed", deadlineAt: Date.now() + 180_000, intervalMs: 1000,
        load: () => api.get<Row>(`/api/issues/${item.id}`), accept: t => t.status === "done" });
      await observeCompletionUpdate({ ...input, sourceId: context.issue().id, workerId: item.id, marker, allRuns: context.allRuns,
        fixtureRequest: `${userMessages.join("\n\n")}\nOrganizer's brief: ${brief}`,
        relatedWorkerIds: delegated.filter(other => other.id !== item.id).map(other => other.id),
        evidence: (name, data) => input.evidence(multiple ? `${index}-${name}` : name, data) });
      const output = await readChatOutputDocument(api, item.id, marker);
      await input.evidence(`completion-update-worker-output-${index}.json`, { task: await api.get(`/api/issues/${item.id}`), output });
      expect(completionOutputUsesReleasedBrief(output.body), "worker output must use the released start time").toBe(true);
      expect(await api.get(`/api/issues/${item.id}/documents/${encodeURIComponent(output.key)}`)).toEqual(output);
    }
    expect((await api.get<Row[]>(`${company}/issues`)).map(t => t.id).sort()).toEqual(delegated.map(t => t.id).sort());
    const comments = await api.get<Row[]>(`/api/issues/${context.issue().id}/comments?order=asc`);
    expect(comments.filter(c => c.authorUserId).map(c => c.body)).toEqual(userMessages);
    const runs = await context.allRuns();
    for (const item of delegated) {
      const replyRuns = runs.filter(r => r.status === "succeeded" && r.contextSnapshot?.issueId === context.issue().id &&
        Array.isArray(r.contextSnapshot?.chatCompletionUpdates) && r.contextSnapshot.chatCompletionUpdates.some((u: Row) => u.id === item.id));
      const replies = comments.filter(c => c.authorAgentId === f.agent.id && replyRuns.some(r => r.id === c.createdByRunId));
      expect(replies, `one correlated completion reply for ${item.id}`).toHaveLength(1);
    }
  } finally {
    // Release every wait a failed attempt may have left running.
    const release = (work: Promise<void>) => work.catch(() => {});
    for (const item of delegated) await release(publishBrief(wait, item.id, `Reference: ${reference}`));
    if (busy) await releaseDocumentGate(context.issue().id);
    const sourceId = (context.issue() as { id: string } | undefined)?.id;
    if (completionWait && sourceId) await release(publishBrief(completionWait, sourceId, "The organizer is ready to receive the saved result."));
    await context.refreshIssue();
  }
}