import type { PoolClient } from "pg";
import { GroupFilesService } from "./group-files.service.js";
import { hashShareToken } from "./share-token.js";
import { beforeEach, describe, expect, it, vi } from "vitest";
import { BadRequestException, ConflictException, ForbiddenException, GoneException, NotFoundException } from "@nestjs/common";

/** Deterministic 64-hex helper: repeat a pattern to exactly 64 chars. */
function hex64(seed: string): string {
  let out = "";
  while (out.length < 64) out += Buffer.from(seed).toString("hex");
  return out.slice(0, 64);
}

// ---------------------------------------------------------------------------
// Fake db surface: route by SQL shape, capture every statement.
// ---------------------------------------------------------------------------
type QueryResult = { rows: Record<string, unknown>[]; rowCount: number };
type Behavior = (sql: string, values: unknown[]) => QueryResult | Promise<QueryResult>;

let behavior: Behavior = () => ({ rows: [], rowCount: 0 });
const statements: Array<{ sql: string; values: unknown[] }> = [];

vi.mock("../db/client.js", () => ({
  withTenant: async (_ws: string, fn: (client: PoolClient) => Promise<unknown>) =>
    fn({
      query: async (sql: string, values: unknown[] = []) => {
        statements.push({ sql, values });
        return behavior(sql, values);
      },
    } as unknown as PoolClient),
  withSystem: async (fn: (client: PoolClient) => Promise<unknown>) =>
    fn({
      query: async (sql: string, values: unknown[] = []) => {
        statements.push({ sql, values });
        return behavior(sql, values);
      },
    } as unknown as PoolClient),
}));



const row = {
  id: "11111111-1111-4111-8111-111111111111",
  workspace_id: "22222222-2222-4222-8222-222222222222",
  group_id: "33333333-3333-4333-8333-333333333333",
  room_id: "!r:example.org",
  event_id: "$e",
  origin: "matrix",
  sender_mxid: "@s:example.org",
  matrix_event_json: { mxcUri: "mxc://example.org/x" },
  original_name: "clip.mp4",
  safe_name: "clip.mp4",
  mime: "video/mp4",
  mime_class: "video",
  byte_size: "10",
  sha256: hex64("z"),
  ocis_resource_id: "res-1",
  ocis_resource_version: "v1",
  created_at: new Date("2026-01-02T03:04:05Z"),
  indexed_at: new Date("2026-01-02T03:04:05Z"),
  available: true,
  retention_mode: "keep",
  legal_hold: false,
  retention_until: null,
  share_access: null,
  share_expires_at: null,
  share_revoked_at: null,
};

/** sha256 hex of a string, computed with the real crypto module. */
function digestOf(input: string): string {
  // eslint-disable-next-line @typescript-eslint/no-require-imports
  const { createHash } = require("node:crypto") as typeof import("node:crypto");
  return createHash("sha256").update(input, "utf8").digest("hex");
}

function envReady(): void {
  process.env.FILES_OCID_WEBDAV_URL = "https://files.example.org";
  process.env.FILES_OCID_USER = "svc";
  process.env.FILES_OCID_PASSWORD = "pw";
  process.env.FILES_PUBLIC_BASE = "https://files.example.org";
}

beforeEach(() => {
  statements.length = 0;
  behavior = () => ({ rows: [], rowCount: 0 });
  envReady();
});

describe("GroupFilesService invariants", () => {
  it("scopes listings to group membership for non-Owner/Admin, binding the caller id positionally", async () => {
    behavior = () => ({ rows: [row], rowCount: 1 });
    const service = new GroupFilesService();
    const page = await service.listFiles(row.workspace_id, "user-1", "Publisher", {});
    const list = statements.find((q) => q.sql.includes("FROM chat_media_archive"))!;
    expect(list.sql).toContain("group_members");
    expect(list.values[1]).toBe("user-1"); // caller id is a bound parameter…
    expect(list.sql).not.toContain("user-1"); // …never SQL text
    expect(list.sql).not.toContain("user-1");
    // Owner/Admin skip the membership subquery but keep $2 bound
    await service.listFiles(row.workspace_id, "user-1", "Owner", {});
    const ownerList = statements.filter((q) => q.sql.includes("FROM chat_media_archive")).at(-1)!;
    expect(ownerList.sql).not.toContain("group_members");
    expect(ownerList.values[1]).toBe("user-1");
    expect(page.items[0]?.status).toBe("available");
    expect(page.items[0]?.shareLink.url).toBe("https://files.example.org/f/res-1");
  });

  it("filters facets positionally and paginates with a (createdAt,id) keyset cursor", async () => {
    behavior = () => ({ rows: [row], rowCount: 1 });
    const service = new GroupFilesService();
    const cursor = Buffer.from(JSON.stringify({ createdAt: "2026-01-01T00:00:00Z", id: row.id })).toString("base64url");
    await service.listFiles(row.workspace_id, "u", "Owner", {
      groupId: row.group_id,
      senderMxid: "@s:example.org",
      mimeClass: "video",
      name: "clip",
      from: "2026-01-01",
      to: "2026-02-01",
      cursor,
      limit: "10",
    });
    const q = statements.find((s) => s.sql.includes("FROM chat_media_archive"))!;
    expect(q.values).toEqual([row.workspace_id, "u", row.group_id, "@s:example.org", "video", "%clip%", "2026-01-01", "2026-02-01", "2026-01-01T00:00:00Z", row.id, 11]);
    expect(q.sql).toContain("(a.created_at, a.id) <");
    expect(q.sql).toContain("ORDER BY a.created_at DESC, a.id DESC");
    // bad facets are rejected before SQL
    await expect(service.listFiles(row.workspace_id, "u", "Owner", { mimeClass: "zip" })).rejects.toBeInstanceOf(BadRequestException);
    await expect(service.listFiles(row.workspace_id, "u", "Owner", { from: "nope" })).rejects.toBeInstanceOf(BadRequestException);
    await expect(service.listFiles(row.workspace_id, "u", "Owner", { from: "2026-03-01", to: "2026-01-01" })).rejects.toBeInstanceOf(BadRequestException);
  });

  it("emits no presigned URL anywhere in a served payload", async () => {
    behavior = () => ({ rows: [row], rowCount: 1 });
    const service = new GroupFilesService();
    const page = await service.listFiles(row.workspace_id, "u", "Owner", {});
    expect(JSON.stringify(page)).not.toContain("X-Amz-Signature");
    expect(JSON.stringify(page)).not.toContain("presign");
    expect(page.items[0]?.shareLink.url).toBe("https://files.example.org/f/res-1");
  });

  it("keeps retention independent from share expiry, and legalHold is an orthogonal flag", async () => {
    behavior = () => ({
      rows: [{ ...row, share_access: "public", share_expires_at: new Date("2020-01-01T00:00:00Z") }],
      rowCount: 1,
    });
    const service = new GroupFilesService();
    const item = await service.getFile(row.workspace_id, "u", "Owner", row.id);
    // share link long gone; the FILE itself is still fully available
    expect(item.status).toBe("available");
    expect(item.shareLink.expiresAt).toBe("2020-01-01T00:00:00.000Z");
    expect(item.retention.mode).toBe("keep");
    // legal hold survives alongside the mode (FileRetention contract)
    behavior = () => ({ rows: [{ ...row, legal_hold: true }], rowCount: 1 });
    const held = await service.getFile(row.workspace_id, "u", "Owner", row.id);
    expect(held.retention).toEqual({ mode: "keep", legalHold: true });
    expect(held.status).toBe("available");
  });

  it("reconstructs all four origin kinds from matrix_event_json", async () => {
    const cases = [
      ["matrix", { mxcUri: "mxc://e/x" }, { kind: "matrix", mxcUri: "mxc://e/x" }],
      ["bridge", { mxcUri: "mxc://e/x", providerId: "telegram", remoteEventId: "9" }, { kind: "bridge", mxcUri: "mxc://e/x", providerId: "telegram", remoteEventId: "9" }],
      ["upload", null, { kind: "upload" }],
      ["pad-export", { padId: "p", revision: "3" }, { kind: "pad-export", padId: "p", revision: "3" }],
    ] as const;
    for (const [origin, json, expected] of cases) {
      behavior = () => ({ rows: [{ ...row, origin, matrix_event_json: json }], rowCount: 1 });
      const service = new GroupFilesService();
      const item = await service.getFile(row.workspace_id, "u", "Owner", row.id);
      expect(item.origin).toEqual(expected);
    }
  });

  it("returns the share token exactly once and keeps it out of audit rows", async () => {
    let auditedDiff: unknown = null;
    behavior = (sql) => {
      if (sql.startsWith("SELECT audit_append")) return { rows: [{ id: "audit-1" }], rowCount: 1 };
      if (sql.startsWith("INSERT INTO group_file_shares")) {
        return {
          rows: [{ id: "55555555-5555-4555-8555-555555555555", access: "public", expires_at: new Date(Date.now() + 3_600_000), revoked_at: null }],
          rowCount: 1,
        };
      }
      return { rows: [row], rowCount: 1 };
    };
    const service = new GroupFilesService();
    const share = await service.createShare(row.workspace_id, row.id, { access: "public", expiresInHours: 2 }, { userId: "u", role: "Owner" });
    expect(share.token).toBeDefined();
    expect(hashShareToken(share.token)).toMatch(/^[0-9a-f]{64}$/);
    expect(share.url).toContain("/files/s/");
    const auditCall = statements.find((q) => q.sql.startsWith("SELECT audit_append"));
    expect(auditCall).toBeDefined();
    auditedDiff = auditCall?.values[6];
    expect(JSON.stringify(auditedDiff)).not.toContain(share.token);
    expect(JSON.stringify(auditCall?.values)).not.toContain(share.token);
    // shape errors before any write
    await expect(service.createShare(row.workspace_id, row.id, { access: "secret" }, { userId: "u", role: "Owner" })).rejects.toBeInstanceOf(BadRequestException);
    await expect(service.createShare(row.workspace_id, row.id, { expiresInHours: 0 }, { userId: "u", role: "Owner" })).rejects.toBeInstanceOf(BadRequestException);
  });

  it("revoking stops serving immediately: item + every live share flipped", async () => {
    let flipped = false;
    behavior = (sql) => {
      if (sql.startsWith("UPDATE chat_media_archive SET available = false")) flipped = true;
      return { rows: [flipped ? { ...row, available: false } : row], rowCount: 1 };
    };
    const service = new GroupFilesService();
    const revoked = await service.markRevoked(row.workspace_id, row.id, { userId: "u", role: "Owner" });
    expect(revoked.status).toBe("revoked");
    const shareRevoke = statements.find((q) => q.sql.startsWith("UPDATE group_file_shares SET revoked_at"));
    expect(shareRevoke).toBeDefined();
    expect(shareRevoke?.values[0]).toBe(row.id);
    // already-revoked is a conflict, not a silent no-op
    behavior = () => ({ rows: [{ ...row, available: false }], rowCount: 1 });
    await expect(service.markRevoked(row.workspace_id, row.id, { userId: "u", role: "Owner" })).rejects.toBeInstanceOf(ConflictException);
  });

  it("replay of an attachment event is a conflict (partial unique (ws,room,event))", async () => {
    behavior = (sql) => {
      if (sql.startsWith("INSERT INTO chat_media_archive")) {
        throw Object.assign(new Error("dup"), { code: "23505" });
      }
      return { rows: [], rowCount: 0 };
    };
    const service = new GroupFilesService();
    await expect(
      service.registerArchiveEntry(row.workspace_id, {
        groupId: row.group_id,
        roomId: "!r:example.org",
        eventId: "$e",
        origin: {},
        originKind: "matrix",
        senderMxid: "@s:example.org",
        originalName: "a.mp4",
        safeName: "a.mp4",
        mime: "video/mp4",
        mimeClass: "video",
        byteSize: 10,
        sha256: hex64("z"),
        ocisResourceVersion: null,
        ocisResourceId: "res",
        createdAt: new Date(),
      }),
    ).rejects.toBeInstanceOf(ConflictException);
  });

  it("openDownload refuses revoked/expired items with Gone, missing rows with NotFound", async () => {
    behavior = () => ({ rows: [{ ...row, available: false }], rowCount: 1 });
    const service = new GroupFilesService();
    await expect(service.openDownload(row.workspace_id, "u", "Owner", row.id)).rejects.toBeInstanceOf(GoneException);
    behavior = () => ({ rows: [{ ...row, retention_mode: "until", retention_until: new Date("2020-01-01T00:00:00Z") }], rowCount: 1 });
    await expect(service.openDownload(row.workspace_id, "u", "Owner", row.id)).rejects.toBeInstanceOf(GoneException);
    behavior = () => ({ rows: [], rowCount: 0 });
    await expect(service.getFile(row.workspace_id, "u", "Owner", row.id)).rejects.toBeInstanceOf(NotFoundException);
    await expect(service.getFile(row.workspace_id, "u", "Owner", "not-a-uuid")).rejects.toBeInstanceOf(BadRequestException);
  });

  it("membership gate denies non-members (Forbidden)", async () => {
    behavior = (sql) => {
      if (sql.includes("FROM group_members")) return { rows: [], rowCount: 0 };
      if (sql.includes("FROM chat_media_archive")) return { rows: [row], rowCount: 1 };
      return { rows: [], rowCount: 0 };
    };
    const service = new GroupFilesService();
    await expect(service.getFile(row.workspace_id, "u", "Publisher", row.id)).rejects.toBeInstanceOf(ForbiddenException);
  });

  it("public claim resolves via the SECURITY DEFINER lookup, then rechecks in-tenant", async () => {
    behavior = (sql) => {
      if (sql.includes("share_for_public_claim")) {
        return { rows: [{ id: "s1", workspace_id: row.workspace_id, item_id: row.id, access: "public", expires_at: new Date(Date.now() + 3600_000), revoked_at: null }], rowCount: 1 };
      }
      return { rows: [{ ...row, sha256: digestOf("payload-bytes") }], rowCount: 1 };
    };
    const payload = Buffer.from("payload-bytes");
    const { createHash } = await import("node:crypto");
    const digest = createHash("sha256").update(payload).digest("hex");
    const { Readable } = await import("node:stream");
    const fetcher = (async () =>
      new Response(Readable.toWeb(Readable.from([payload])) as unknown as ReadableStream, {
        status: 200,
        headers: { "content-type": "application/octet-stream", "content-length": String(payload.byteLength) },
      })) as unknown as typeof fetch;
    const service = new GroupFilesService({ fetcher });
    const handle = await service.claimPublicDownload("some-token");
    expect(handle.item.id).toBe(row.id);
    expect(handle.item.checksum.value).toBe(digest);
    expect(handle.download.sizeBytes).toBe(payload.byteLength);
    const claim = statements.find((q) => q.sql.includes("share_for_public_claim"));
    expect(claim).toBeDefined();
    // members-only tokens are rejected on the public surface
    behavior = (sql) => {
      if (sql.includes("share_for_public_claim")) {
        return { rows: [{ id: "s1", workspace_id: row.workspace_id, item_id: row.id, access: "members", expires_at: new Date(Date.now() + 3600_000), revoked_at: null }], rowCount: 1 };
      }
      return { rows: [row], rowCount: 1 };
    };
    await expect(service.claimPublicDownload("some-token")).rejects.toBeInstanceOf(ForbiddenException);
    // unknown token: 404, no tenant entered
    behavior = () => ({ rows: [], rowCount: 0 });
    await expect(service.claimPublicDownload("nope")).rejects.toBeInstanceOf(NotFoundException);
  });
});