var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (g && (g = 0, op[0] && (_ = 0)), _) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
import EventEmitter from "eventemitter3";
var Task = /** @class */ (function () {
    function Task(index, slideIndex, fn, eventHub, id) {
        this.state = "idle";
        this.index = -1;
        this.slideIndex = -1;
        this.fn = fn;
        this.index = index;
        this.slideIndex = slideIndex;
        this.eventHub = eventHub;
        this.id = id;
    }
    Task.prototype.apply = function () {
        return __awaiter(this, void 0, void 0, function () {
            var e_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        this.eventHub.emit("task-start", this);
                        _a.label = 1;
                    case 1:
                        _a.trys.push([1, 3, , 4]);
                        this.state = "start";
                        return [4 /*yield*/, this.fn()];
                    case 2:
                        _a.sent();
                        this.state = "end";
                        this.eventHub.emit("task-end", this);
                        return [3 /*break*/, 4];
                    case 3:
                        e_1 = _a.sent();
                        this.eventHub.emit("task-error", {
                            task: this,
                            error: e_1,
                        });
                        return [3 /*break*/, 4];
                    case 4: return [2 /*return*/];
                }
            });
        });
    };
    return Task;
}());
export { Task };
var RenderingTaskManager = /** @class */ (function () {
    function RenderingTaskManager() {
        var _this = this;
        this.eventHub = new EventEmitter();
        this.tasks = [];
        this.index = 0;
        this.eventHub.on("task-end", function (task) {
            var _a;
            var selfIndex = _this.tasks.findIndex(function (t) { return t.index === task.index; });
            var nextIndex = selfIndex + 1;
            if (nextIndex >= 0) {
                (_a = _this.tasks[nextIndex]) === null || _a === void 0 ? void 0 : _a.apply();
            }
            if (selfIndex >= 0) {
                _this.tasks.splice(selfIndex, 1);
                _this.replaceIdleTask();
            }
            _this.eventHub.emit("task-end-".concat(task.id));
        });
        this.eventHub.on("task-error", function (_a) {
            var task = _a.task;
            var selfIndex = _this.tasks.findIndex(function (t) { return t.index === task.index; });
            if (selfIndex >= 0) {
                _this.tasks.splice(selfIndex, 1);
                _this.replaceIdleTask();
            }
            _this.eventHub.emit("task-error-".concat(task.id));
        });
    }
    RenderingTaskManager.prototype.replaceIdleTask = function () {
        var _this = this;
        var _a;
        var ids = new Set();
        for (var i = 0, len = this.tasks.length; i < len; i++) {
            if (this.tasks[i].state === "idle" && ((_a = this.tasks[i + 1]) === null || _a === void 0 ? void 0 : _a.state) === "idle") {
                ids.add(i);
            }
        }
        Array.from(ids).forEach(function (id) {
            _this.tasks.splice(id, 1);
        });
    };
    RenderingTaskManager.prototype.addTask = function (fn, slideIndex, id) {
        var task = new Task(this.index++, slideIndex, fn, this.eventHub, id);
        this.tasks.push(task);
        this.tasks.sort(function (a, b) { return a.index - b.index; });
        this.replaceIdleTask();
        if (this.tasks.length === 1) {
            task.apply();
        }
    };
    RenderingTaskManager.prototype.hasStartTask = function () {
        return this.tasks.some(function (t) { return t.state === "start"; });
    };
    RenderingTaskManager.prototype.destroy = function () {
        this.eventHub.removeAllListeners();
    };
    return RenderingTaskManager;
}());
export { RenderingTaskManager };
