/*
Copyright 2019, 2022 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import { Room, MatrixClient, RoomMember } from "matrix-js-sdk/src/matrix";

import AutocompleteWrapperModel, { UpdateCallback } from "../../src/editor/autocomplete";
import { Caret } from "../../src/editor/caret";
import { PillPart, Part, PartCreator } from "../../src/editor/parts";
import DocumentPosition from "../../src/editor/position";

export class MockAutoComplete {
    public _updateCallback;
    public _partCreator;
    public _completions;
    public _part: Part | null;

    constructor(updateCallback: UpdateCallback, partCreator: PartCreator, completions: PillPart[]) {
        this._updateCallback = updateCallback;
        this._partCreator = partCreator;
        this._completions = completions;
        this._part = null;
    }

    close() {
        this._updateCallback({ close: true });
    }

    tryComplete(close = true) {
        const matches = this._completions.filter((o) => {
            return this._part && o.resourceId.startsWith(this._part.text);
        });
        if (matches.length === 1 && this._part && this._part.text.length > 1) {
            const match = matches[0];
            let pill: PillPart;
            if (match.resourceId[0] === "@") {
                pill = this._partCreator.userPill(match.text, match.resourceId);
            } else {
                pill = this._partCreator.roomPill(match.resourceId);
            }
            this._updateCallback({ replaceParts: [pill], close });
        }
    }

    // called by EditorModel when typing into pill-candidate part
    onPartUpdate(part: Part, pos: DocumentPosition) {
        this._part = part;
    }
}

// MockClient & MockRoom are only used for avatars in room and user pills,
// which is not tested
class MockRoom {
    getMember(): RoomMember | null {
        return null;
    }
}

export function createPartCreator(completions: PillPart[] = []) {
    const autoCompleteCreator = (partCreator: PartCreator) => {
        return (updateCallback: UpdateCallback) =>
            new MockAutoComplete(updateCallback, partCreator, completions) as unknown as AutocompleteWrapperModel;
    };
    const room = new MockRoom() as unknown as Room;
    const client = {
        getRooms: jest.fn().mockReturnValue([]),
        getRoom: jest.fn().mockReturnValue(null),
    } as unknown as MatrixClient;
    return new PartCreator(room, client, autoCompleteCreator);
}

export function createRenderer() {
    const render = (c: Caret) => {
        render.caret = c;
        render.count += 1;
    };
    render.count = 0;
    render.caret = null as unknown as Caret;
    return render;
}

// in many tests we need to narrow the caret type
export function isDocumentPosition(caret: Caret): caret is DocumentPosition {
    return caret instanceof DocumentPosition;
}