import { computed, ref, watch, defineComponent } from "vue"
import { InputPassword } from "ant-design-vue"
import "./index.less"
import { genPixel } from "../../utils/style.js"

/**
 * 密码输入框
 *
 * 分为4个密码强度等级，每有以下字符的一种增强一个等级：数字，大写字母，小写字母，特殊字符
 * 每个等级都有对应的颜色，当输入的密码包含对应的等级时，对应的等级颜色会高亮
 *
 *
 * @version 1.0.0
 */
export default defineComponent({
	name: "NewbiePassword",
	components: { InputPassword },
	props: {
		/**
		 * 输入框的值
		 *
		 */
		value: { type: String, default: "" },
		/**
		 * 最小长度
		 */
		min: { type: Number, default: 8 },
		/**
		 * 最大长度
		 */
		max: { type: Number, default: 20 },

		/**
		 * 宽度
		 */
		width: { type: [Number, String], default: 300 },
	},
	emits: [
		/**
		 * @event update:modelValue
		 */
		"update:value",

		/**
		 * 输入框内容变化时的回调
		 * @event change
		 * @param {Event} event 事件对象
		 */
		"change",
	],
	setup(props, { emit, expose }) {
		const password = ref("")

		watch(
			() => props.modelValue,
			() => {
				password.value = props.modelValue
			},
		)

		const strength = computed(() => {
			let score = 0
			const regexList = [
				/\d/, // 包含数字
				/[a-z]/, // 包含小写字母
				/[A-Z]/, // 包含大写字母
				/[^a-zA-Z0-9]/, // 包含特殊符号
			]

			regexList.forEach((regex) => {
				if (regex.test(password.value)) {
					score += 1
				}
			})

			return score
		})

		const classList = ["", "bad", "weak", "medium", "strong"]

		const onChange = (e) => {
			const { value } = e.target
			emit("change", e)
			emit("update:value", value)
		}

		const showError = computed(() => {
			return (password.value.length > 0 && password.value.length < props.min) || password.value.length > props.max || strength.value < 4
		})

		const errorMessage = computed(() => {
			if (password.value.length > 0 && password.value.length < props.min) {
				return `密码长度不能少于${props.min}个字符`
			}
			if (password.value.length > props.max) {
				return `密码长度不能超过${props.max}个字符`
			}
			if (strength.value < 4) {
				return "密码必须包含数字、小写字母、大写字母和特殊符号"
			}

			return ""
		})
		expose({
			/**
			 * 密码强度，0 为最弱，4 为最强
			 * @type {ComputedRef<number>}
			 */
			strength,
		})
		return () => (
			<div class="newbie-password" style={{ width: genPixel(props.width) }}>
				<input-password v-model:value={password.value} onChange={onChange} minlength={props.min} maxlength={props.max}></input-password>
				<div class={`strength-indicator-container ${classList[strength.value]}`}>
					<div class={`strength-indicator ${strength.value >= 1 ? "active" : ""}`}></div>
					<div class={`strength-indicator ${strength.value >= 2 ? "active" : ""}`}></div>
					<div class={`strength-indicator ${strength.value >= 3 ? "active" : ""}`}></div>
					<div class={`strength-indicator ${strength.value >= 4 ? "active" : ""}`}></div>
				</div>
				{showError.value ? <div class="error-message">{errorMessage.value}</div> : null}
			</div>
		)
	},
})