/**
 * DTP-02 / DTP-09 / DTP-26 — schema-version pinning + per-file
 * consistency invariants + structured error context.
 */

import { describe, expect, it } from "@suaveplan/testing/runner";
import type {
    DriveTemplate,
    FileTemplate,
    FolderTemplate,
} from "../src/index.js";
import {
    assertFile,
    assertFolderFileInvariants,
    type DriveTemplateError,
    DTP_CODES,
    TemplateNonceLru,
    validateTemplate,
} from "../src/index.js";
import { DEFAULT_POLICY, makeKeys, signed } from "./_helpers.js";

const baseFile: FileTemplate = {
    name: "x.bin",
    fileLocId: "loc-1",
    fileId: "f".repeat(64),
    size: 100,
    totalChunks: 1,
    chunkSize: 1024,
    checksum: "blake3:abcd",
    flags: DEFAULT_POLICY,
    manifestKey: "manifest:f",
    manifestSig: new Uint8Array(64).fill(1),
};

describe("DTP-02 — schema version pinned to 1", () => {
    it("schemaVersion ≠ 1 rejected with TEMPLATE_VERSION_UNSUPPORTED", {
        timeout: 5000,
    }, () => {
        const keys = makeKeys();
        const tpl = signed({ issuer: keys.publicHex }, keys);
        // Cast through unknown to bypass the literal-1 type guard.
        const broken = { ...tpl, schemaVersion: 2 } as unknown as DriveTemplate;
        try {
            validateTemplate(broken, {
                clock: () => Date.now(),
                nonceLru: new TemplateNonceLru(),
            });
            throw new Error("expected VERSION_UNSUPPORTED");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.TEMPLATE_VERSION_UNSUPPORTED
            );
        }
    });
});

describe("DTP-09 — per-file consistency invariants", () => {
    it("chunkSize 164 rejected", { timeout: 5000 }, () => {
        try {
            assertFile({ ...baseFile, chunkSize: 164 }, "/x.bin");
            throw new Error("expected MALFORMED");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.TEMPLATE_MALFORMED
            );
            expect((err as DriveTemplateError).context).toMatchObject({
                file: "/x.bin",
            });
        }
    });

    it("totalChunks insufficient for size rejected", { timeout: 5000 }, () => {
        try {
            assertFile(
                { ...baseFile, totalChunks: 1, chunkSize: 1024, size: 4096 },
                "/x.bin"
            );
            throw new Error("expected MALFORMED");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.TEMPLATE_MALFORMED
            );
        }
    });

    it("valid file passes through assertFile (positive path)", {
        timeout: 5000,
    }, () => {
        expect(() => assertFile(baseFile, "/x.bin")).not.toThrow();
    });

    it("empty manifestKey rejected", { timeout: 5000 }, () => {
        try {
            assertFile({ ...baseFile, manifestKey: "" }, "/x.bin");
            throw new Error("expected MALFORMED");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.TEMPLATE_MALFORMED
            );
        }
    });

    it("malformed checksum rejected", { timeout: 5000 }, () => {
        try {
            assertFile({ ...baseFile, checksum: "md5:abc" }, "/x.bin");
            throw new Error("expected MALFORMED");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.TEMPLATE_MALFORMED
            );
        }
    });

    it("empty manifestSig rejected", { timeout: 5000 }, () => {
        try {
            assertFile(
                { ...baseFile, manifestSig: new Uint8Array(0) },
                "/x.bin"
            );
            throw new Error("expected MALFORMED");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.TEMPLATE_MALFORMED
            );
        }
    });

    it("nested folder: deepest file's failure surfaces with full path", {
        timeout: 5000,
    }, () => {
        const tree: FolderTemplate = {
            name: "/",
            children: [
                {
                    name: "photos",
                    children: [
                        {
                            name: "wedding",
                            children: [{ ...baseFile, chunkSize: 164 }],
                        },
                    ],
                },
            ],
        };
        try {
            assertFolderFileInvariants(tree);
            throw new Error("expected MALFORMED");
        } catch (err) {
            expect((err as DriveTemplateError).code).toBe(
                DTP_CODES.TEMPLATE_MALFORMED
            );
            const ctx = (err as DriveTemplateError).context as { file: string };
            expect(ctx.file).toContain("photos");
            expect(ctx.file).toContain("wedding");
        }
    });
});