import {vi, expect, onTestFinished, type Mock} from 'vitest';
import {Map, type MapOptions} from '../../ui/map.ts';
import {NullWebGL2RenderingContext} from './null_gl.ts';
import {extend} from '../../util/util.ts';
import {type Dispatcher} from '../../util/dispatcher.ts';
import {type IActor} from '../actor.ts';
import {MessageType, type ActorMessage, type RequestResponseMessageMap} from '../actor_messages.ts';
import {Evented} from '../evented.ts';
import {type SourceEventType} from '../../ui/events.ts';
import {type SourceSpecification, type StyleSpecification, type TerrainSpecification} from '@maplibre/maplibre-gl-style-spec';
import {MercatorTransform} from '../../geo/projection/mercator_transform.ts';
import {RequestManager} from '../request_manager.ts';
import {type IReadonlyTransform, type ITransform} from '../../geo/transform_interface.ts';
import {type Style} from '../../style/style.ts';
import {Terrain} from '../../render/terrain.ts';
import type {Framebuffer} from '../../webgl/framebuffer.ts';
import {Frustum} from '../primitives/frustum.ts';
import {mat4} from 'gl-matrix';
import {DEMData} from '../../data/dem_data.ts';
import {RGBAImage} from '../image.ts';
import {type OverscaledTileID} from '../../tile/tile_id.ts';
import type {Tile} from '../../tile/tile.ts';
import type {TileManager} from '../../tile/tile_manager.ts';
import type {Painter} from '../../render/painter.ts';

export class StubMap extends Evented {
    style: Style;
    transform: IReadonlyTransform;
    private _requestManager: RequestManager;
    _terrain: TerrainSpecification;

    constructor() {
        super();
        this.transform = new MercatorTransform();
        this._requestManager = new RequestManager();
    }

    _getMapId(): number {
        return 1;
    }

    getPixelRatio(): number {
        return 1;
    }

    setTerrain(terrain: TerrainSpecification): void { this._terrain = terrain; }
    getTerrain(): TerrainSpecification { return this._terrain; }

    migrateProjection(newTransform: ITransform): void {
        newTransform.apply(this.transform, true);
        this.transform = newTransform;
    }
}

export function createMap(options?: Partial<MapOptions> & {deleteStyle?: boolean}): Map {
    const container = window.document.createElement('div');
    const defaultOptions = {
        container,
        interactive: false,
        attributionControl: false,
        maplibreLogo: false,
        trackResize: true,
        style: {
            'version': 8,
            'sources': {},
            'layers': []
        }
    };

    Object.defineProperty(container, 'clientWidth', {value: 200, configurable: true});
    Object.defineProperty(container, 'clientHeight', {value: 200, configurable: true});

    if (options?.deleteStyle) delete defaultOptions.style;

    return new Map(extend(defaultOptions, options));
}

export function equalWithPrecision(
    test: {equal: (a: number, b: number, message: string, extra?: unknown) => unknown},
    expected: number,
    actual: number,
    multiplier: number,
    message?: string,
    extra?: unknown
): unknown {
    message ||= `should be equal to within ${multiplier}`;
    const expectedRounded = Math.round(expected / multiplier) * multiplier;
    const actualRounded = Math.round(actual / multiplier) * multiplier;

    return test.equal(expectedRounded, actualRounded, message, extra);
}

export function setPerformance(): void {
    window.performance.mark = vi.fn();
    window.performance.clearMeasures = vi.fn();
    window.performance.clearMarks = vi.fn();
}

export function setMatchMedia(): void {
    // https://jestjs.io/docs/manual-mocks#mocking-methods-which-are-not-implemented-in-jsdom
    Object.defineProperty(window, 'matchMedia', {
        writable: true,
        value: vi.fn().mockImplementation(query => ({
            matches: false,
            media: query,
            onchange: null,
            addListener: vi.fn(), // deprecated
            removeListener: vi.fn(), // deprecated
            addEventListener: vi.fn(),
            removeEventListener: vi.fn(),
            dispatchEvent: vi.fn(),
        })),
    });
}

function setResizeObserver() {
    global.ResizeObserver = vi.fn(class {
        observe = vi.fn();
        unobserve = vi.fn();
        disconnect = vi.fn();
    });
}
let _originalGetContext: typeof HTMLCanvasElement.prototype.getContext | undefined;

function setNullGLGetContext() {
    _originalGetContext ??= HTMLCanvasElement.prototype.getContext;
    HTMLCanvasElement.prototype.getContext = function (type: string, attributes?: any): any {
        if (type === 'webgl2') return new NullWebGL2RenderingContext(this, attributes);
        return _originalGetContext.call(this, type, attributes);
    } as any;
}

export function beforeMapTest(): void {
    setNullGLGetContext();
    setPerformance();
    setMatchMedia();
    setResizeObserver();
    onTestFinished(() => {
        HTMLCanvasElement.prototype.getContext = _originalGetContext;
    });
}

export function getWrapDispatcher(): (actor: IActor) => Dispatcher {
    return (actor: IActor) => {
        return {
            actorsPromise: Promise.resolve([actor]),
            waitForInitComplete() {
                return Promise.resolve();
            },
            getActor() {
                return Promise.resolve(actor);
            },
            getReadyActor() {
                return actor;
            }
        } as any as Dispatcher;
    };
}

export function getMockDispatcher(): Dispatcher {
    const wrapDispatcher = getWrapDispatcher();

    return wrapDispatcher({
        sendAsync() {
            return Promise.resolve({});
        },
    });
}

export function stubAjaxGetImage(createImageBitmap: typeof global.createImageBitmap): void {
    global.createImageBitmap = createImageBitmap;

    global.URL.revokeObjectURL = () => {};
    global.URL.createObjectURL = (_) => { return null; };

    Object.defineProperty(global.Image.prototype, 'src', {
        set(url: string) {
            if (url === 'error') {
                this.onerror();
            } else if (this.onload) {
                this.onload();
            }
        }
    });
}

/**
 * This should be used in test that use nise since the internal buffer returned from a file is not an instance of ArrayBuffer for some reason.
 * @param data - the data read from a file, for example by `fs.readFileSync(...)`
 * @returns a copy of the data in the file in `ArrayBuffer` format
 */
export function bufferToArrayBuffer(data: Buffer): ArrayBuffer {
    const newBuffer = new ArrayBuffer(data.buffer.byteLength);
    const view = new Uint8Array(newBuffer);
    data.copy(view);
    return view.buffer;
}

/**
 * This allows test to wait for a certain amount of time before continuing.
 * @param milliseconds - the amount of time to wait in milliseconds
 * @returns - a promise that resolves after the specified amount of time
 */
export const sleep: (milliseconds?: number) => Promise<void> = (milliseconds: number = 0) => {
    return new Promise<void>(resolve => setTimeout(resolve, milliseconds));
};

export function waitForMetadataEvent(source: Evented<SourceEventType>): Promise<void> {
    return new Promise((resolve) => {
        source.on('data', (e) => {
            if (e.sourceDataType === 'metadata') {
                resolve();
            }
        });
    });
}

export function createStyleSource(): SourceSpecification {
    return {
        type: 'geojson',
        data: {
            type: 'FeatureCollection',
            features: []
        }
    };
}

export function createStyle(): StyleSpecification {
    return {
        version: 8,
        center: [-73.9749, 40.7736],
        zoom: 12.5,
        bearing: 29,
        pitch: 50,
        sources: {},
        layers: []
    };
}

export function expectToBeCloseToArray(actual: number[], expected: number[], precision?: number): void {
    expect(actual).toHaveLength(expected.length);
    for (let i = 0; i < expected.length; i++) {
        expect(actual[i]).toBeCloseTo(expected[i], precision);
    }
}

export function createTerrain(): Terrain {
    return {
        getCoverageIndex: () => null,
        getElevationForLngLatZoom: () => 1000,
        getElevationForLngLat: () => 1000,
        getMinTileElevationForLngLatZoom: () => 0,
        resetElevationCache: () => {},
        getFramebuffer: () => ({}),
        depthAtPoint: () => .9,
        tileManager: {
            update: () => {},
            getRenderableTiles: () => [],
            anyTilesAfterTime: () => false
        }
    } as any as Terrain;
}

export function createFramebuffer(): Framebuffer {
    return {
        colorAttachment: {
            get: () => null,
            set: () => {}
        },
        depthAttachment: {
            get: () => null,
            set: () => {}
        },
        destroy: () => {}
    } as unknown as Framebuffer;
}

export function waitForEvent(evented: Evented, eventName: string, predicate: (e: any) => boolean): Promise<any> {
    return new Promise((resolve) => {
        const listener = (e: Event) => {
            if (predicate(e)) {
                resolve(e);
            }
        };
        evented.on(eventName, listener);
    });
}

export function createTestCameraFrustum(fovy: number, aspectRatio: number, zNear: number, zFar: number, elevation: number, rotation: number): Frustum {
    const proj = new Float64Array(16) as any as mat4;
    const invProj = new Float64Array(16) as any as mat4;

    // Note that left handed coordinate space is used where z goes towards the sky.
    // Y has to be flipped as well because it's part of the projection/camera matrix used in transform.js
    mat4.perspective(proj, fovy, aspectRatio, zNear, zFar);
    mat4.scale(proj, proj, [1, -1, 1]);
    mat4.translate(proj, proj, [0, 0, elevation]);
    mat4.rotateZ(proj, proj, rotation);
    mat4.invert(invProj, proj);

    return Frustum.fromInvProjectionMatrix(invProj, 1.0, 0.0);
}

export function createDEM(heightFn: (x: number, y: number) => number, dim: number = 8): DEMData {
    const stride = dim + 4;
    const pixels = new Uint8Array(stride * stride * 4);
    for (let y = 0; y < dim; y++) {
        for (let x = 0; x < dim; x++) {
            const value = heightFn(x, y) + 32768;
            const index = ((y + 2) * stride + x + 2) * 4;
            pixels[index] = Math.floor(value / 256);
            pixels[index + 1] = Math.floor(value) % 256;
            pixels[index + 2] = Math.round((value - Math.floor(value)) * 256);
            pixels[index + 3] = 255;
        }
    }
    return new DEMData('dem', new RGBAImage({width: stride, height: stride}, pixels), 'terrarium');
}

export function createDEMTerrain(tileIDs: OverscaledTileID[], dem: DEMData | null, exaggeration: number = 1): Terrain {
    const painter = {} as Painter;
    const tileManager = {_source: {tileSize: 512, minzoom: 0, maxzoom: 22}} as TileManager;
    const terrain = new Terrain(painter, tileManager, {exaggeration} as TerrainSpecification);
    terrain.tileManager.getRenderableTiles = () => tileIDs.map(tileID => ({tileID}) as Tile);
    terrain.tileManager.getSourceTile = (tileID) => (dem ? {tileID, dem} as Tile : undefined);
    terrain.tileManager.getSource = () => ({minzoom: 0, maxzoom: 22}) as any;
    return terrain;
}

const fakeImages = {
    hello: {data: {width: 1, height: 1, data: new Uint8Array([0])}, pixelRatio: 1, sdf: false, version: 0}
};

/**
 * The glyph a {@link createFakeActor} answers a `getGlyphs` request with, keyed by the grapheme
 * cluster layout asks for it by.
 */
const fakeGlyphs = {
    'StandardFont-Bold': {
        e: {id: 101, bitmap: {width: 1, height: 1, data: new Uint8Array([0])}, metrics: {width: 1, height: 1, left: 0, top: 0, advance: 1}}
    }
};

/**
 * An actor that answers a worker source's requests for images and glyphs with fixtures, after a
 * delay long enough that a test can abort the request part-way.
 *
 * @param shouldAbort - consulted on every request. Where it is given, the actor also rejects a
 * request that is aborted while in flight; where it is not, an aborted request is simply never
 * answered, as it is for a source that has moved on.
 * @param onAbort - called whenever a request in flight is aborted
 */
export function createFakeActor(shouldAbort?: () => boolean, onAbort?: () => void): IActor & {sendAsync: Mock} {
    return {
        sendAsync: vi.fn(<T extends MessageType>(message: ActorMessage<T>, abortController?: AbortController): Promise<RequestResponseMessageMap[T][1]> => {
            if (shouldAbort?.()) return Promise.reject('aborted by test');

            return new Promise((resolve, reject) => {
                const timeout = setTimeout(() => {
                    const response = message.type === MessageType.getImages ? fakeImages : fakeGlyphs;
                    resolve(response as RequestResponseMessageMap[T][1]);
                }, 100);

                abortController?.signal.addEventListener('abort', () => {
                    clearTimeout(timeout);
                    onAbort?.();
                    if (shouldAbort) reject('aborted by abortController');
                });
            });
        })
    };
}