// TODO: なんでもかんでもos.tsに突っ込むのやめたいのでよしなに分割する

import { Component, defineAsyncComponent, markRaw, reactive, Ref, ref } from 'vue';
import { EventEmitter } from 'eventemitter3';
import insertTextAtCursor from 'insert-text-at-cursor';
import * as Misskey from 'misskey-js';
import { apiUrl, url } from '@/config';
import MkPostFormDialog from '@/components/post-form-dialog.vue';
import MkWaitingDialog from '@/components/waiting-dialog.vue';
import { resolve } from '@/router';
import { $i } from '@/account';

export const pendingApiRequestsCount = ref(0);

const apiClient = new Misskey.api.APIClient({
	origin: url,
});

export const api = ((endpoint: string, data: Record<string, any> = {}, token?: string | null | undefined) => {
	pendingApiRequestsCount.value++;

	const onFinally = () => {
		pendingApiRequestsCount.value--;
	};

	const promise = new Promise((resolve, reject) => {
		// Append a credential
		if ($i) (data as any).i = $i.token;
		if (token !== undefined) (data as any).i = token;

		// Send request
		fetch(endpoint.indexOf('://') > -1 ? endpoint : `${apiUrl}/${endpoint}`, {
			method: 'POST',
			body: JSON.stringify(data),
			credentials: 'omit',
			cache: 'no-cache'
		}).then(async (res) => {
			const body = res.status === 204 ? null : await res.json();

			if (res.status === 200) {
				resolve(body);
			} else if (res.status === 204) {
				resolve();
			} else {
				reject(body.error);
			}
		}).catch(reject);
	});

	promise.then(onFinally, onFinally);

	return promise;
}) as typeof apiClient.request;

export const apiWithDialog = ((
	endpoint: string,
	data: Record<string, any> = {},
	token?: string | null | undefined,
) => {
	const promise = api(endpoint, data, token);
	promiseDialog(promise, null, (e) => {
		alert({
			type: 'error',
			text: e.message + '\n' + (e as any).id,
		});
	});

	return promise;
}) as typeof api;

export function promiseDialog<T extends Promise<any>>(
	promise: T,
	onSuccess?: ((res: any) => void) | null,
	onFailure?: ((e: Error) => void) | null,
	text?: string,
): T {
	const showing = ref(true);
	const success = ref(false);

	promise.then(res => {
		if (onSuccess) {
			showing.value = false;
			onSuccess(res);
		} else {
			success.value = true;
			window.setTimeout(() => {
				showing.value = false;
			}, 1000);
		}
	}).catch(e => {
		showing.value = false;
		if (onFailure) {
			onFailure(e);
		} else {
			alert({
				type: 'error',
				text: e
			});
		}
	});

	// NOTE: dynamic importすると挙動がおかしくなる(showingの変更が伝播しない)
	popup(MkWaitingDialog, {
		success: success,
		showing: showing,
		text: text,
	}, {}, 'closed');

	return promise;
}

function isModule(x: any): x is typeof import('*.vue') {
	return x.default != null;
}

let popupIdCount = 0;
export const popups = ref([]) as Ref<{
	id: any;
	component: any;
	props: Record<string, any>;
}[]>;

const zIndexes = {
	low: 1000000,
	middle: 2000000,
	high: 3000000,
};
export function claimZIndex(priority: 'low' | 'middle' | 'high' = 'low'): number {
	zIndexes[priority] += 100;
	return zIndexes[priority];
}

export async function popup(component: Component | typeof import('*.vue') | Promise<Component | typeof import('*.vue')>, props: Record<string, any>, events = {}, disposeEvent?: string) {
	if (component.then) component = await component;

	if (isModule(component)) component = component.default;
	markRaw(component);

	const id = ++popupIdCount;
	const dispose = () => {
		// このsetTimeoutが無いと挙動がおかしくなる(autocompleteが閉じなくなる)。Vueのバグ？
		window.setTimeout(() => {
			popups.value = popups.value.filter(popup => popup.id !== id);
		}, 0);
	};
	const state = {
		component,
		props,
		events: disposeEvent ? {
			...events,
			[disposeEvent]: dispose
		} : events,
		id,
	};

	popups.value.push(state);

	return {
		dispose,
	};
}

export function pageWindow(path: string) {
	const { component, props } = resolve(path);
	popup(import('@/components/page-window.vue'), {
		initialPath: path,
		initialComponent: markRaw(component),
		initialProps: props,
	}, {}, 'closed');
}

export function modalPageWindow(path: string) {
	const { component, props } = resolve(path);
	popup(import('@/components/modal-page-window.vue'), {
		initialPath: path,
		initialComponent: markRaw(component),
		initialProps: props,
	}, {}, 'closed');
}

export function toast(message: string) {
	popup(import('@/components/toast.vue'), {
		message
	}, {}, 'closed');
}

export function alert(props: {
	type?: 'error' | 'info' | 'success' | 'warning' | 'waiting' | 'question';
	title?: string | null;
	text?: string | null;
}): Promise<void> {
	return new Promise((resolve, reject) => {
		popup(import('@/components/dialog.vue'), props, {
			done: result => {
				resolve();
			},
		}, 'closed');
	});
}

export function confirm(props: {
	type: 'error' | 'info' | 'success' | 'warning' | 'waiting' | 'question';
	title?: string | null;
	text?: string | null;
}): Promise<{ canceled: boolean }> {
	return new Promise((resolve, reject) => {
		popup(import('@/components/dialog.vue'), {
			...props,
			showCancelButton: true,
		}, {
			done: result => {
				resolve(result ? result : { canceled: true });
			},
		}, 'closed');
	});
}

export function inputText(props: {
	type?: 'text' | 'email' | 'password' | 'url';
	title?: string | null;
	text?: string | null;
	placeholder?: string | null;
	default?: string | null;
}): Promise<{ canceled: true; result: undefined; } | {
	canceled: false; result: string;
}> {
	return new Promise((resolve, reject) => {
		popup(import('@/components/dialog.vue'), {
			title: props.title,
			text: props.text,
			input: {
				type: props.type,
				placeholder: props.placeholder,
				default: props.default,
			}
		}, {
			done: result => {
				resolve(result ? result : { canceled: true });
			},
		}, 'closed');
	});
}

export function inputNumber(props: {
	title?: string | null;
	text?: string | null;
	placeholder?: string | null;
	default?: number | null;
}): Promise<{ canceled: true; result: undefined; } | {
	canceled: false; result: number;
}> {
	return new Promise((resolve, reject) => {
		popup(import('@/components/dialog.vue'), {
			title: props.title,
			text: props.text,
			input: {
				type: 'number',
				placeholder: props.placeholder,
				default: props.default,
			}
		}, {
			done: result => {
				resolve(result ? result : { canceled: true });
			},
		}, 'closed');
	});
}

export function inputDate(props: {
	title?: string | null;
	text?: string | null;
	placeholder?: string | null;
	default?: Date | null;
}): Promise<{ canceled: true; result: undefined; } | {
	canceled: false; result: Date;
}> {
	return new Promise((resolve, reject) => {
		popup(import('@/components/dialog.vue'), {
			title: props.title,
			text: props.text,
			input: {
				type: 'date',
				placeholder: props.placeholder,
				default: props.default,
			}
		}, {
			done: result => {
				resolve(result ? { result: new Date(result.result), canceled: false } : { canceled: true });
			},
		}, 'closed');
	});
}

export function select(props: {
	title?: string | null;
	text?: string | null;
	default?: string | null;
	items?: {
		value: string;
		text: string;
	}[];
	groupedItems?: {
		label: string;
		items: {
			value: string;
			text: string;
		}[];
	}[];
}): Promise<{ canceled: true; result: undefined; } | {
	canceled: false; result: string;
}> {
	return new Promise((resolve, reject) => {
		popup(import('@/components/dialog.vue'), {
			title: props.title,
			text: props.text,
			select: {
				items: props.items,
				groupedItems: props.groupedItems,
				default: props.default,
			}
		}, {
			done: result => {
				resolve(result ? result : { canceled: true });
			},
		}, 'closed');
	});
}

export function success() {
	return new Promise((resolve, reject) => {
		const showing = ref(true);
		window.setTimeout(() => {
			showing.value = false;
		}, 1000);
		popup(import('@/components/waiting-dialog.vue'), {
			success: true,
			showing: showing
		}, {
			done: () => resolve(),
		}, 'closed');
	});
}

export function waiting() {
	return new Promise((resolve, reject) => {
		const showing = ref(true);
		popup(import('@/components/waiting-dialog.vue'), {
			success: false,
			showing: showing
		}, {
			done: () => resolve(),
		}, 'closed');
	});
}

export function form(title, form) {
	return new Promise((resolve, reject) => {
		popup(import('@/components/form-dialog.vue'), { title, form }, {
			done: result => {
				resolve(result);
			},
		}, 'closed');
	});
}

export async function selectUser() {
	return new Promise((resolve, reject) => {
		popup(import('@/components/user-select-dialog.vue'), {}, {
			ok: user => {
				resolve(user);
			},
		}, 'closed');
	});
}

export async function selectDriveFile(multiple: boolean) {
	return new Promise((resolve, reject) => {
		popup(import('@/components/drive-select-dialog.vue'), {
			type: 'file',
			multiple
		}, {
			done: files => {
				if (files) {
					resolve(multiple ? files : files[0]);
				}
			},
		}, 'closed');
	});
}

export async function selectDriveFolder(multiple: boolean) {
	return new Promise((resolve, reject) => {
		popup(import('@/components/drive-select-dialog.vue'), {
			type: 'folder',
			multiple
		}, {
			done: folders => {
				if (folders) {
					resolve(multiple ? folders : folders[0]);
				}
			},
		}, 'closed');
	});
}

export async function pickEmoji(src?: HTMLElement, opts) {
	return new Promise((resolve, reject) => {
		popup(import('@/components/emoji-picker-dialog.vue'), {
			src,
			...opts
		}, {
			done: emoji => {
				resolve(emoji);
			},
		}, 'closed');
	});
}

type AwaitType<T> =
	T extends Promise<infer U> ? U :
	T extends (...args: any[]) => Promise<infer V> ? V :
	T;
let openingEmojiPicker: AwaitType<ReturnType<typeof popup>> | null = null;
let activeTextarea: HTMLTextAreaElement | HTMLInputElement | null = null;
export async function openEmojiPicker(src?: HTMLElement, opts, initialTextarea: typeof activeTextarea) {
	if (openingEmojiPicker) return;

	activeTextarea = initialTextarea;

	const textareas = document.querySelectorAll('textarea, input');
	for (const textarea of Array.from(textareas)) {
		textarea.addEventListener('focus', () => {
			activeTextarea = textarea;
		});
	}

	const observer = new MutationObserver(records => {
		for (const record of records) {
			for (const node of Array.from(record.addedNodes).filter(node => node instanceof HTMLElement) as HTMLElement[]) {
				const textareas = node.querySelectorAll('textarea, input') as NodeListOf<NonNullable<typeof activeTextarea>>;
				for (const textarea of Array.from(textareas).filter(textarea => textarea.dataset.preventEmojiInsert == null)) {
					if (document.activeElement === textarea) activeTextarea = textarea;
					textarea.addEventListener('focus', () => {
						activeTextarea = textarea;
					});
				}
			}
		}
	});

	observer.observe(document.body, {
		childList: true,
		subtree: true,
		attributes: false,
		characterData: false,
	});

	openingEmojiPicker = await popup(import('@/components/emoji-picker-window.vue'), {
		src,
		...opts
	}, {
		chosen: emoji => {
			insertTextAtCursor(activeTextarea, emoji);
		},
		closed: () => {
			openingEmojiPicker!.dispose();
			openingEmojiPicker = null;
			observer.disconnect();
		}
	});
}

export function popupMenu(items: any[] | Ref<any[]>, src?: HTMLElement, options?: {
	align?: string;
	width?: number;
	viaKeyboard?: boolean;
}) {
	return new Promise((resolve, reject) => {
		let dispose;
		popup(import('@/components/ui/popup-menu.vue'), {
			items,
			src,
			width: options?.width,
			align: options?.align,
			viaKeyboard: options?.viaKeyboard
		}, {
			closed: () => {
				resolve();
				dispose();
			},
		}).then(res => {
			dispose = res.dispose;
		});
	});
}

export function contextMenu(items: any[], ev: MouseEvent) {
	ev.preventDefault();
	return new Promise((resolve, reject) => {
		let dispose;
		popup(import('@/components/ui/context-menu.vue'), {
			items,
			ev,
		}, {
			closed: () => {
				resolve();
				dispose();
			},
		}).then(res => {
			dispose = res.dispose;
		});
	});
}

export function post(props: Record<string, any> = {}) {
	return new Promise((resolve, reject) => {
		// NOTE: MkPostFormDialogをdynamic importするとiOSでテキストエリアに自動フォーカスできない
		// NOTE: ただ、dynamic importしない場合、MkPostFormDialogインスタンスが使いまわされ、
		//       Vueが渡されたコンポーネントに内部的に__propsというプロパティを生やす影響で、
		//       複数のpost formを開いたときに場合によってはエラーになる
		//       もちろん複数のpost formを開けること自体Misskeyサイドのバグなのだが
		let dispose;
		popup(MkPostFormDialog, props, {
			closed: () => {
				resolve();
				dispose();
			},
		}).then(res => {
			dispose = res.dispose;
		});
	});
}

export const deckGlobalEvents = new EventEmitter();

export const uploads = ref<{
	id: string;
	name: string;
	progressMax: number | undefined;
	progressValue: number | undefined;
	img: string;
}[]>([]);

export function upload(file: File, folder?: any, name?: string): Promise<Misskey.entities.DriveFile> {
	if (folder && typeof folder == 'object') folder = folder.id;

	return new Promise((resolve, reject) => {
		const id = Math.random().toString();

		const reader = new FileReader();
		reader.onload = (e) => {
			const ctx = reactive({
				id: id,
				name: name || file.name || 'untitled',
				progressMax: undefined,
				progressValue: undefined,
				img: window.URL.createObjectURL(file)
			});

			uploads.value.push(ctx);

			const data = new FormData();
			data.append('i', $i.token);
			data.append('force', 'true');
			data.append('file', file);

			if (folder) data.append('folderId', folder);
			if (name) data.append('name', name);

			const xhr = new XMLHttpRequest();
			xhr.open('POST', apiUrl + '/drive/files/create', true);
			xhr.onload = (ev) => {
				if (ev.target == null || ev.target.response == null) {
					// TODO: 消すのではなくて再送できるようにしたい
					uploads.value = uploads.value.filter(x => x.id != id);

					alert({
						type: 'error',
						text: 'upload failed'
					});

					reject();
					return;
				}

				const driveFile = JSON.parse(ev.target.response);

				resolve(driveFile);

				uploads.value = uploads.value.filter(x => x.id != id);
			};

			xhr.upload.onprogress = e => {
				if (e.lengthComputable) {
					ctx.progressMax = e.total;
					ctx.progressValue = e.loaded;
				}
			};

			xhr.send(data);
		};
		reader.readAsArrayBuffer(file);
	});
}

/*
export function checkExistence(fileData: ArrayBuffer): Promise<any> {
	return new Promise((resolve, reject) => {
		const data = new FormData();
		data.append('md5', getMD5(fileData));

		os.api('drive/files/find-by-hash', {
			md5: getMD5(fileData)
		}).then(resp => {
			resolve(resp.length > 0 ? resp[0] : null);
		});
	});
}*/