import {BasicCustomerInstance, CustomerParams} from '../Controller';
import {isObjectLike} from 'lodash';
import {isExpression, parseExpressionString, safeStringify} from '../../../util/vm';

export interface PassCustomerExecConfig {
    /**
     * 设置的值
     */
    groups: {key: string; value: string}[];

    /**
     * 动作
     */
    action?: 'SET' | 'DELETE';
}

export class LocalStorageCustomer implements BasicCustomerInstance {
    async exec(config: PassCustomerExecConfig, params: CustomerParams) {
        let groups = config.groups;
        let {
            runTime
        } = params;

        if (typeof groups === 'string' && isExpression(groups)) {
            groups = parseExpressionString(groups, runTime);
        }

        if (groups instanceof Array) {
            return groups.map(group => {
                let key = group.key;
                let value = group.value;

                if (isExpression(key)) {
                    key = parseExpressionString(key, runTime);
                }

                if (isExpression(value)) {
                    value = parseExpressionString(value, runTime);
                }

                if (isObjectLike(value)) {
                    value = safeStringify(value);
                }

                let action = config.action || 'SET';

                switch (action) {
                    default:
                    case 'SET':
                        try {
                            localStorage.setItem(key, value);
                        } catch (e) {
                            console.error(e);
                        }
                        break;
                    case 'DELETE':
                        try {
                            localStorage.removeItem(key);
                        } catch (e) {
                            console.error(e);
                        }
                        break;
                }

                return {key: key, value: value};
            });
        } else {
            console.error('LocalStorage的groups需要是一个数组');
            return null;
        }
    }
}