import java.security.MessageDigest

// 自定义函数
ext {
    gitVersionCode = {
        def cmd = 'git rev-list HEAD --count'
        return cmd.execute().text.trim().toInteger()
    }

    gitVersionTag = {
        def cmd = 'git describe --tags'
        def version = cmd.execute().text.trim()

        def pattern = "-(\\d+)-g"
        def matcher = version =~ pattern

        // 若最近的 commit 没有 tag，则增加第4位
        if (matcher) {
            version = version.substring(0, matcher.start()) + "." + matcher[0][1]
        }
        return version
    }

    releaseTime = {
        return new Date().format("yyyy-MM-dd", TimeZone.getTimeZone("UTC"))
    }

    genUpdateJson = { downloadUrl, releaseDir, apkFileName, defaultConfig, variant ->
        // 生成 update.json 文件，用于自动更新
        def releaseTime = releaseTime()
        def txtFile = new File(releaseDir, "update.json")
        def changeLog = ""
        def fileMd5 = ""

        // 读取 changelog，并提取最新版本的日志
        def changeLogFile = new File(project.getProjectDir().path, "changelog.md")
        def text = changeLogFile.text
        def marker = "### 更新记录"
        def startIndex = text.indexOf(marker)

        if (startIndex != -1) {
            // 找到标记后，找到下一个空行
            def endIndex = text.indexOf('\r\n\r\n', startIndex)
            if(endIndex == -1)
                endIndex = text.length() - 1

            if (endIndex != -1) {
                // 截取内容并存储到变量B
                def content = text.substring(startIndex + marker.length(), endIndex)
                changeLog = content.trim()
                changeLog = changeLog.replaceAll("\r\n", "\\\\n")
            }
        }

        def apkFile = new File(releaseDir, apkFileName)
        // 计算 md5 值
        // 使用 Java 的 MessageDigest 计算 MD5
        MessageDigest md5 = MessageDigest.getInstance("MD5")
        apkFile.eachByte(4096) { bytes, bytesRead ->
            md5.update(bytes, 0, bytesRead)
        }
        // 将 MD5 转换为十六进制字符串
        fileMd5 = md5.digest().collect { String.format("%02X", it) }.join()

        // 写入APK信息到文本文件
        txtFile.text = "{\n" +
                "  \"applicationId\": \"${defaultConfig.applicationId}\",\n" +
                "  \"variantName\": \"${variant.buildType.name}\",\n" +
                "  \"versionName\": \"${defaultConfig.versionName}\",\n" +
                "  \"versionCode\": ${defaultConfig.versionCode},\n" +
                "  \"releaseDate\": \"${releaseTime}\",\n" +
                "  \"changeLog\": \"${changeLog}\",\n" +
                "  \"fileMd5\": \"${fileMd5}\",\n" +
                "  \"downloadUrl\": \"${downloadUrl}\"\n" +
                "}"
    }
}

// 自定义任务
task customTask {
    doLast {
        println "This is a custom task."
    }
}