import {
    getApiEnvironment,
    selectApiEnvironment,
    type ApiEnvironment,
} from '../config/api';
import { hasPendingApiWrites } from './api-activity';
import { invalidatePendingAuthentication } from './auth-session';

let switching = false;

/** 统一切换入口：写入中不切换，保留分环境会话，重建全部页面以丢弃旧业务状态。 */
export async function switchApiEnvironment(environment: ApiEnvironment) {
    if (wx.getAccountInfoSync().miniProgram.envVersion !== 'develop')
        throw new Error('仅开发版可切换环境');
    if (switching) throw new Error('正在切换环境，请稍候');
    if (getApiEnvironment() === environment) return false;
    const busyPage = getCurrentPages().some(
        (page) => page.data.debugPublishLoading || page.data.isSavingProfile,
    );
    if (hasPendingApiWrites() || busyPage)
        throw new Error('请等待当前保存或上传完成后再切换');
    switching = true;
    try {
        selectApiEnvironment(environment);
        invalidatePendingAuthentication();
        const app = getApp<IAppOption>();
        app.resetApiState();
        // reLaunch 只重建页面，不重新执行 App.onLaunch；目标数据需要主动初始化。
        try {
            await new Promise<void>((resolve, reject) =>
                wx.reLaunch({
                    url: '/pages/home/home',
                    success: () => resolve(),
                    fail: () => reject(new Error('环境已切换，请重新进入首页')),
                }),
            );
        } finally {
            app.warmAuthentication();
            if (!(await app.loadPageConfig(true)))
                throw new Error('已切换，目标接口连接失败');
        }
        return true;
    } finally {
        switching = false;
    }
}