/**
 * Tests for the CLI read helpers (`src/cli-read.ts`, owner amendment to
 * issue #36, issue #52).
 *
 * The `collections`, `files`, `get`, and `get-thumb` commands must answer for
 * current server state, not the local cache, so each helper forces a
 * `Library.fresh()` round-trip before it reads. The stand-in library below
 * serves nothing until `fresh()` has been awaited, so a helper that read
 * without refreshing would come back empty and fail here.
 *
 * `collections` and `files` also list in the library's enumeration order
 * (`listCollections`/`listFiles`) — the order the pre-library CLI printed — not
 * the albums/photos projection's newest-first order. The fixtures are seeded in
 * an enumeration order that a newest-first sort would rearrange, so a
 * regression to the projection order would fail here too. Field values still
 * come from the raw metadata via `cli-output.ts`.
 */

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

import {
    freshCollections,
    freshFiles,
    freshFile,
    type FreshReadLibrary,
} from "../../src/cli-read.js";
import { fileListRow } from "../../src/cli-output.js";
import type { Photo } from "../../src/library/index.js";
import type { Collection, EnteFile } from "../../src/model/types.js";

const collection = (id: number, updationTime: number): Collection => ({
    id,
    ownerID: 42,
    key: new Uint8Array(),
    name: `album-${id}`,
    type: "album",
    updationTime,
    isShared: false,
});

// Microseconds, as Ente stores times.
const file = (
    id: number,
    collectionID: number,
    creationTime: number,
): EnteFile => ({
    id,
    collectionID,
    ownerID: 42,
    key: new Uint8Array(),
    metadata: {
        title: `file-${id}.jpg`,
        fileType: "image",
        creationTime,
        modificationTime: creationTime,
    },
    file: { decryptionHeader: "" },
    thumbnail: { decryptionHeader: "" },
    updationTime: creationTime,
});

// A library that reveals its records only after `fresh()` has been awaited, and
// serves them in the enumeration order it was given. `photos.byID` returns a
// stand-in `Photo` carrying just the fileID the helper passes through.
class FakeLibrary implements FreshReadLibrary {
    freshCalls = 0;
    private refreshed = false;

    constructor(
        private readonly collections: Collection[],
        private readonly files: EnteFile[],
    ) {}

    async fresh(): Promise<unknown> {
        this.freshCalls++;
        this.refreshed = true;
        return {};
    }

    listCollections(): Collection[] {
        return this.refreshed ? this.collections : [];
    }

    getCollection(id: number): Collection | undefined {
        return this.listCollections().find((c) => c.id === id);
    }

    listFiles(collectionID: number): EnteFile[] {
        return this.refreshed
            ? this.files.filter((f) => f.collectionID === collectionID)
            : [];
    }

    getFileByID(fileID: number): EnteFile | undefined {
        if (!this.refreshed) return undefined;
        return this.files.find((f) => f.id === fileID);
    }

    photos = {
        byID: ({ fileID }: { fileID: number }): Photo | undefined => {
            if (!this.refreshed) return undefined;
            if (!this.files.some((f) => f.id === fileID)) return undefined;
            return { fileID } as unknown as Photo;
        },
    };
}

describe("CLI read helpers (issue #36 amendment, issue #52)", () => {
    it("freshCollections refreshes first, then lists in enumeration order", async () => {
        // Enumeration order 2, 1, 3; a newest-first sort would be 3, 2, 1.
        const lib = new FakeLibrary(
            [collection(2, 200), collection(1, 300), collection(3, 100)],
            [],
        );
        const rows = await freshCollections(lib);

        expect(lib.freshCalls).toBe(1);
        expect(rows.map((c) => c.id)).toEqual([2, 1, 3]);
        // The projection's newest-first order is a different sequence, so this
        // is not accidentally that order.
        const newestFirst = [...rows]
            .sort((a, b) => b.updationTime - a.updationTime)
            .map((c) => c.id);
        expect(newestFirst).toEqual([1, 2, 3]);
        expect(rows.map((c) => c.id)).not.toEqual(newestFirst);
    });

    it("freshFiles refreshes first, lists in enumeration order, keeps raw fields", async () => {
        // Enumeration order by id 10, 11, 12; creationTimes ascending, so a
        // newest-first sort would reverse them.
        const files = [
            file(10, 1, 1_700_000_000_000_000),
            file(11, 1, 1_700_000_000_000_001),
            file(12, 1, 1_700_000_000_000_002),
        ];
        const lib = new FakeLibrary([collection(1, 100)], files);

        const rows = await freshFiles(lib, 1);
        expect(lib.freshCalls).toBe(1);
        expect(rows?.map((f) => f.id)).toEqual([10, 11, 12]);

        // Field values come from raw metadata: microsecond creationTime and the
        // raw title, unchanged.
        expect(rows?.map(fileListRow)).toEqual([
            {
                id: 10,
                title: "file-10.jpg",
                fileType: "image",
                creationTime: 1_700_000_000_000_000,
                collectionID: 1,
            },
            {
                id: 11,
                title: "file-11.jpg",
                fileType: "image",
                creationTime: 1_700_000_000_000_001,
                collectionID: 1,
            },
            {
                id: 12,
                title: "file-12.jpg",
                fileType: "image",
                creationTime: 1_700_000_000_000_002,
                collectionID: 1,
            },
        ]);
    });

    it("freshFiles returns undefined for an unknown collection", async () => {
        const lib = new FakeLibrary([collection(1, 100)], []);
        const rows = await freshFiles(lib, 999);
        expect(lib.freshCalls).toBe(1);
        expect(rows).toBeUndefined();
    });

    it("freshFile refreshes first, then resolves the photo and its raw record", async () => {
        const f = file(10, 1, 1_700_000_000_000_000);
        const lib = new FakeLibrary([collection(1, 100)], [f]);

        const resolved = await freshFile(lib, 10);
        expect(lib.freshCalls).toBe(1);
        expect(resolved?.photo.fileID).toBe(10);
        expect(resolved?.file.metadata.title).toBe("file-10.jpg");
        expect(resolved?.file.metadata.creationTime).toBe(
            1_700_000_000_000_000,
        );
    });

    it("freshFile returns undefined for an unknown file", async () => {
        const lib = new FakeLibrary([collection(1, 100)], []);
        const resolved = await freshFile(lib, 404);
        expect(lib.freshCalls).toBe(1);
        expect(resolved).toBeUndefined();
    });
});