import { expect, it, vi } from "vitest";

import {
  createAnalysisExecution,
  type AnalysisClient,
  type AnalysisOperation,
  type AnalysisProvider,
  type CapabilityDescriptor,
  type ProviderIdentity,
} from "../AnalysisProvider.js";
import { ProviderCleanupError } from "../../domain/providerCleanupError.js";
import { projectAnalysisError } from "../../domain/analysisErrorProjection.js";
import { err, ok } from "../../domain/result.js";
import { CompositeProvider } from "./CompositeProvider.js";

const identity = (id: string): ProviderIdentity => ({
  id,
  name: id,
  version: "1",
});

const operationCapability = (
  provider: ProviderIdentity,
  operation: Exclude<AnalysisOperation, "health">,
): CapabilityDescriptor => ({
  provider,
  operation,
  available: true,
  reason: null,
  effects: {
    mutatesArtifact: false,
    launchesProcess: false,
    mayShowUi: false,
    mayAccessNetwork: false,
    mayWriteFilesystem: false,
    changesPermissions: false,
    requiresRoot: false,
  },
  limitations: [],
});

const failingProvider = (
  id: string,
  operation: Exclude<AnalysisOperation, "health">,
  resource: string,
) => {
  const providerIdentity = identity(id);
  const cleanupError = new ProviderCleanupError(
    id,
    [resource],
    {
      reason: `${id} cleanup is unresolved`,
      child_marker: `${id}-detail`,
    },
    { remediationAction: `Resolve ${resource} before retrying ${id}.` },
  );
  const close = vi.fn(async () => err(cleanupError));
  const provider: AnalysisProvider = {
    identity: () => providerIdentity,
    capabilities: () => [operationCapability(providerIdentity, operation)],
    createClient: (): AnalysisClient => ({
      execute: (name) =>
        Promise.resolve(
          ok(createAnalysisExecution(`${id}:${name}`, providerIdentity)),
        ),
      close,
    }),
  };
  return { provider, close, cleanupError };
};

const executableTarget = {
  path: "/tmp/fixture",
  sha256: "a".repeat(64),
  kind: "executable",
  format: "elf",
  architecture: "x86_64",
  availableArchitectures: ["x86_64"],
} as const;

it("does not create a previously unused child after the composite closes", async () => {
  const child = failingProvider("provider-only", "address_name", "one-db");
  const create = vi.spyOn(child.provider, "createClient");
  const client = new CompositeProvider([child.provider]).createClient(
    executableTarget,
  );
  expect(await client.close()).toEqual(ok(null));
  expect(client.reuseReadiness?.()).toBe("blocked");
  expect(await client.executeIfReady?.("address_name", {})).toBeUndefined();
  expect(await client.execute("address_name", {})).toMatchObject({
    ok: false,
    error: {
      _tag: "ProviderAdapterError",
      diagnostics: { reason: "client_closed" },
    },
  });
  expect(create).not.toHaveBeenCalled();
  expect(child.close).not.toHaveBeenCalled();
});

it("retains every failed child resource across composite cleanup retries", async () => {
  const left = failingProvider("provider-left", "address_name", "left-db");
  const right = failingProvider("provider-right", "procedure_info", "right-db");
  const client = new CompositeProvider([
    left.provider,
    right.provider,
  ]).createClient(executableTarget);

  expect((await client.execute("address_name", {})).ok).toBe(true);
  expect((await client.execute("procedure_info", {})).ok).toBe(true);

  for (let attempt = 0; attempt < 2; attempt += 1) {
    const closed = await client.close();
    expect(closed.ok).toBe(false);
    if (closed.ok) throw new Error("Expected composite cleanup failure");
    expect(closed.error).toMatchObject({
      cleanupIncomplete: true,
      cleanupResources: ["left-db", "right-db"],
      diagnostics: {
        failures: [
          { provider_id: "provider-left", resources: ["left-db"] },
          { provider_id: "provider-right", resources: ["right-db"] },
        ],
      },
    });
    expect(closed.error).toBeInstanceOf(ProviderCleanupError);
    const projected = projectAnalysisError(closed.error);
    expect(projected.remediation.action).toContain(
      "Resolve left-db before retrying provider-left.",
    );
    expect(projected.remediation.action).toContain(
      "Resolve right-db before retrying provider-right.",
    );
    expect(closed.error.diagnostics).toMatchObject({
      failures: [
        {
          diagnostics: { reason: "provider-left cleanup is unresolved" },
        },
        {
          diagnostics: { reason: "provider-right cleanup is unresolved" },
        },
      ],
    });
  }

  expect(left.close).toHaveBeenCalledTimes(2);
  expect(right.close).toHaveBeenCalledTimes(2);
});

it("preserves one child's typed cleanup error unchanged", async () => {
  const child = failingProvider("provider-only", "address_name", "one-db");
  const client = new CompositeProvider([child.provider]).createClient(
    executableTarget,
  );
  expect((await client.execute("address_name", {})).ok).toBe(true);

  const closed = await client.close();

  expect(closed.ok).toBe(false);
  if (closed.ok) throw new Error("Expected child cleanup failure");
  expect(closed.error).toBe(child.cleanupError);
});

it("does not close a child again after its cleanup succeeded", async () => {
  const firstIdentity = identity("provider-first");
  const secondIdentity = identity("provider-second");
  let secondCloseAttempts = 0;
  const firstClose = vi.fn(async () => ok(null));
  const secondClose = vi.fn(async () => {
    secondCloseAttempts += 1;
    return secondCloseAttempts === 1
      ? err(new ProviderCleanupError("provider-second", ["second-db"], {}))
      : ok(null);
  });
  const makeProvider = (
    providerIdentity: ProviderIdentity,
    operation: Exclude<AnalysisOperation, "health">,
    close: AnalysisClient["close"],
  ): AnalysisProvider => ({
    identity: () => providerIdentity,
    capabilities: () => [operationCapability(providerIdentity, operation)],
    createClient: () => ({
      execute: async () => ok(createAnalysisExecution(null, providerIdentity)),
      close,
    }),
  });
  const client = new CompositeProvider([
    makeProvider(firstIdentity, "address_name", firstClose),
    makeProvider(secondIdentity, "procedure_info", secondClose),
  ]).createClient(executableTarget);
  await client.execute("address_name", {});
  await client.execute("procedure_info", {});

  expect((await client.close({ retainDocument: true })).ok).toBe(false);
  expect((await client.close()).ok).toBe(true);
  expect(firstClose).toHaveBeenCalledTimes(1);
  expect(secondClose).toHaveBeenCalledTimes(2);
  expect((await client.close({ retainDocument: true })).ok).toBe(true);
  expect(firstClose).toHaveBeenCalledTimes(1);
  expect(secondClose).toHaveBeenCalledTimes(2);
});

it.each(["busy", "unknown", "idle", undefined] as const)(
  "keeps partial health truthful with child state %s and an unobserved peer",
  async (state) => {
    const observedIdentity = identity("provider-observed");
    const unobservedIdentity = identity("provider-unobserved");
    const observed: AnalysisProvider = {
      identity: () => observedIdentity,
      capabilities: () => [
        operationCapability(observedIdentity, "address_name"),
      ],
      createClient: () => ({
        execute: async () =>
          ok(createAnalysisExecution(null, observedIdentity)),
        operationHealthSnapshot: () =>
          state === undefined
            ? undefined
            : {
                state,
                stage: state === "idle" ? null : "analysis",
                retryAction:
                  state === "busy"
                    ? "wait"
                    : state === "idle"
                      ? null
                      : "unknown",
                exitCode: null,
                requests: [],
              },
        close: async () => ok(null),
      }),
    };
    const unobserved: AnalysisProvider = {
      identity: () => unobservedIdentity,
      capabilities: () => [
        operationCapability(unobservedIdentity, "procedure_info"),
      ],
      createClient: () => ({
        execute: async () =>
          ok(createAnalysisExecution(null, unobservedIdentity)),
        close: async () => ok(null),
      }),
    };
    const client = new CompositeProvider([observed, unobserved]).createClient(
      executableTarget,
    );
    await client.execute("address_name", {});
    await client.execute("procedure_info", {});

    if (state === "idle" || state === undefined)
      expect(client.operationHealthSnapshot?.()).toBeUndefined();
    else expect(client.operationHealthSnapshot?.()).toMatchObject({ state });
    expect((await client.close()).ok).toBe(true);
  },
);