package yuyuecha

import (
	"sort"
	"strings"
)

// 签名头固定顺序，便于阅读与对比
var preferredHeaderOrder = []string{
	"Content-Type",
	"clientId",
	"timestamp",
	"nonce",
	"signature",
}

// generateCurlCommand 生成可复现的 curl 命令，便于数据源排查
func generateCurlCommand(method, url string, headers map[string]string, body string) string {
	var cmd strings.Builder
	cmd.WriteString("curl -X ")
	cmd.WriteString(method)
	cmd.WriteString(" '")
	cmd.WriteString(url)
	cmd.WriteString("'")

	for _, key := range orderedHeaderKeys(headers) {
		cmd.WriteString(" \\\n  -H '")
		cmd.WriteString(escapeShellSingleQuote(key))
		cmd.WriteString(": ")
		cmd.WriteString(escapeShellSingleQuote(headers[key]))
		cmd.WriteString("'")
	}

	if body != "" {
		cmd.WriteString(" \\\n  -d '")
		cmd.WriteString(escapeShellSingleQuote(body))
		cmd.WriteString("'")
	}

	return cmd.String()
}

func orderedHeaderKeys(headers map[string]string) []string {
	seen := make(map[string]struct{}, len(headers))
	keys := make([]string, 0, len(headers))
	for _, key := range preferredHeaderOrder {
		if _, ok := headers[key]; ok {
			keys = append(keys, key)
			seen[key] = struct{}{}
		}
	}
	rest := make([]string, 0, len(headers))
	for key := range headers {
		if _, ok := seen[key]; !ok {
			rest = append(rest, key)
		}
	}
	sort.Strings(rest)
	return append(keys, rest...)
}

func escapeShellSingleQuote(s string) string {
	return strings.ReplaceAll(s, "'", `'\''`)
}