/**
 * 下载打印通用工具
 * 支持下载次数限制和激励广告
 */

import { checkAndSaveImage } from './saveImage';
import tracker from './tracker';
import { addDownloadLog } from './downloadLogs';
import {
    getUnlockMethod,
    isDownloadLimitEnabled,
    needsUnlockBeforeDownload,
    recordAdUnlockSuccess,
    recordDownloadSuccess,
} from './shareGuide';

// 导出供个人中心等使用
export { getTodayDownloadCount } from './shareGuide';

/** 是否跳过下载配额与激励广告（与 shareGuide.isDownloadLimitEnabled 相反） */
function isDevBypassLimits(): boolean {
    return !isDownloadLimitEnabled();
}

// 激励视频广告单元ID
const AD_UNIT_ID = 'adunit-eff5626f8b68c2e0';

let rewardedVideoAd: WechatMiniprogram.RewardedVideoAd | null = null;

function getRewardedVideoAd(): WechatMiniprogram.RewardedVideoAd | null {
    if (!wx.createRewardedVideoAd) {
        return null;
    }
    if (!rewardedVideoAd) {
        rewardedVideoAd = wx.createRewardedVideoAd({
            adUnitId: AD_UNIT_ID,
        });
        rewardedVideoAd.onLoad(() => {
            console.log('激励视频广告加载成功');
        });
        rewardedVideoAd.onError((err) => {
            console.error('激励视频广告加载失败', err);
        });
    }
    return rewardedVideoAd;
}

/**
 * 显示激励视频广告（单例实例，与改版前 downloadPrint 内逻辑一致）
 */
function showVideoAd(): Promise<boolean> {
    return new Promise((resolve) => {
        const videoAd = getRewardedVideoAd();

        if (!videoAd) {
            wx.showToast({
                title: '当前环境不支持激励广告',
                icon: 'none',
            });
            resolve(false);
            return;
        }

        wx.showLoading({
            title: '加载中...',
            mask: true,
        });

        const onClose: WechatMiniprogram.RewardedVideoAdOnCloseCallback = (res) => {
            videoAd.offClose(onClose);
            wx.hideLoading();
            resolve(!!(res && res.isEnded));
        };

        videoAd.onClose(onClose);

        videoAd
            .show()
            .then(() => {
                wx.hideLoading();
            })
            .catch(() => {
                videoAd
                    .load()
                    .then(() => videoAd.show())
                    .then(() => {
                        wx.hideLoading();
                    })
                    .catch((err) => {
                        videoAd.offClose(onClose);
                        wx.hideLoading();
                        console.error('激励视频广告显示失败', err);
                        wx.showToast({
                            title: '广告加载失败，请稍后重试',
                            icon: 'none',
                        });
                        resolve(false);
                    });
            });
    });
}

/**
 * 观看激励广告以解锁下一批下载（不执行保存）
 */
export async function tryUnlockWithRewardedAd(): Promise<boolean> {
    if (isDevBypassLimits()) {
        return true;
    }
    if (!needsUnlockBeforeDownload()) {
        return true;
    }
    if (getUnlockMethod() !== 'ad') {
        return false;
    }
    const watched = await showVideoAd();
    if (watched) {
        recordAdUnlockSuccess();
        return true;
    }
    return false;
}

/**
 * 执行下载
 */
function doDownload(
    canvas: Canvas,
    options: {
        successToast?: string;
        errorToast?: string;
        trackerName?: string;
        trackerMode?: string;
        worksheetId?: string;
    },
): Promise<boolean> {
    if (options.trackerName) {
        if (options.trackerMode) {
            tracker.reportDownload(options.trackerName, options.trackerMode);
        } else {
            tracker.reportDownload(options.trackerName);
        }
    }

    return checkAndSaveImage(canvas).then((saved) => {
        if (saved) {
            recordDownloadSuccess();
            if (options.worksheetId) {
                addDownloadLog(options.worksheetId);
            }
        }
        return saved;
    });
}

/**
 * 下载打印（通用方法）
 */
export async function downloadPrint(
    canvas: Canvas | null,
    options: {
        successToast?: string;
        errorToast?: string;
        trackerName?: string;
        trackerMode?: string;
        worksheetId?: string;
    } = {},
): Promise<boolean> {
    if (!canvas) {
        wx.showToast({
            title: options.errorToast || '请先生成内容',
            icon: 'none',
        });
        return false;
    }

    if (isDevBypassLimits()) {
        return doDownload(canvas, options);
    }

    if (needsUnlockBeforeDownload()) {
        const method = getUnlockMethod();
        if (method === 'share') {
            return false;
        }
        if (method === 'ad') {
            const unlocked = await tryUnlockWithRewardedAd();
            if (!unlocked) {
                return false;
            }
        }
    }

    return doDownload(canvas, options);
}