/** 首字母大写 apple -> Apple */
export function textCapitalize(str: string) {
    return str.charAt(0).toUpperCase() + str.slice(1)
}

const camelizeRE = /-(\w)/g
/** 横杠转驼峰 user-tools -> userTools */
export function textCamelize(str: string) {
    return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ""))
}

const hyphenateRE = /\B([A-Z])/g
/** 驼峰转横杠 userTools  -> user-tools */
export function textHyphenate(str: string) {
    return str.replace(hyphenateRE, "-$1").toLowerCase()
}

/** 分割字符串
 *  按照驼峰、横杠、下划线、空格来分词
 *
 * @example
 * "userTools" -> ["user", "Tools"]
 * "user-tools" -> ["user", "Tools"]
 * "user_tools" -> ["user", "Tools"]
 * "user tools" -> ["user", "Tools"]
 */
export function splitTextByCase(text: string) {
    return text
        .replace(/([a-z0-9])([A-Z])/g, "$1 $2") // 处理驼峰命名
        .replace(/[-_]/g, " ") // 处理横杠和下划线
        .split(" ") // 根据空格分割
        .filter((x) => x !== "") // 移除空字符串
}

/**
 * 将字符串按照驼峰、横杠、下划线、空格来分词，然后转换为大写、小写、首字母大写
 * @example textCaseToSpace("userTools", "upper") -> "USER TOOLS"
 * @param text
 * @param caseType
 */
export function textCaseToSpace(text: string, caseType: "upper" | "lower" | "title" = "title") {
    if (!text) return text
    return splitTextByCase(text)
        .map((x) => {
            switch (caseType) {
                case "upper":
                    return x.toUpperCase()
                case "lower":
                    return x.toLowerCase()
                case "title":
                    return textCapitalize(x)
            }
        })
        .join(" ")
}