export default {
    methods: {
        /**
         * 读取后台装修下发的布尔开关
         * 依次取 names 中的字段, 兼容 1/0、"1"/"0"、true/false、"true"/"false" 等值类型
         * 命中返回 true/false; 所有字段都未下发时返回 undefined (由调用方决定兜底)
         *
         * 匹配顺序:
         *   1. 精确命中 (showAddCart / show_add_cart ...)
         *   2. 忽略大小写、下划线、中划线、空格的差异 (showaddcart === showAddCart === show_add_cart)
         *      —— 后台实际字段名与前端约定写法不一致时, 这一步兜底
         *   3. 常见嵌套容器 (value.style / value.config / value.setting / value.data)
         */
        getDiyToggle(names) {
            const v = this.value || {};
            const parse = val => {
                if (val === undefined || val === null || val === '') return undefined;
                if (val === true || val === 1 || val === '1' || val === 'true') return true;
                if (val === false || val === 0 || val === '0' || val === 'false') return false;
                return !!val;
            };
            const pick = obj => {
                if (!obj || typeof obj != 'object') return undefined;
                // 1. 精确命中
                let i, res;
                for (i = 0; i < names.length; i++) {
                    res = parse(obj[names[i]]);
                    if (res !== undefined) return res;
                }
                // 2. 忽略大小写/下划线等差异
                const norm = k => String(k).toLowerCase().replace(/[\s_-]/g, '');
                const wanted = names.map(norm);
                for (const key in obj) {
                    if (wanted.indexOf(norm(key)) != -1) {
                        res = parse(obj[key]);
                        if (res !== undefined) return res;
                    }
                }
                return undefined;
            };

            const root = pick(v);
            if (root !== undefined) return root;

            // 3. 嵌套容器兜底
            const containers = ['style', 'config', 'setting', 'data'];
            for (let i = 0; i < containers.length; i++) {
                const res = pick(v[containers[i]]);
                if (res !== undefined) return res;
            }
            return undefined;
        },

        // 异步触发事件
        async __$emitEvent(payload = {eventName: '__unnamedEvent', data: {}, promiseCallback: null}) {
            await this.$eventBus.emit(payload.eventName, payload.data, payload.promiseCallback)
        },

        // 预览图片
		previewImg(img) {
			// #ifdef MP-WEIXIN
			uni.previewImage({
				current: 0,
				urls: [this.$util.img(img)],
				success: function (res) { },
				fail: function (res) { },
				complete: function (res) { },
			})
			// #endif
		},        
    }
}