package util

import (
	"net/url"
	"strings"

	"github.com/gogf/gf/v2/encoding/gjson"
	"github.com/gogf/gf/v2/util/gconv"
)

// ReverseMap 映射 payload 到 mapping
func ReverseMap(mapping map[string]any, payload map[string]any) map[string]any {
	jsonObj := gjson.New("{}")
	for path, defaultValue := range mapping {
		val := gjson.New(payload).Get(path)
		if !val.IsNil() {
			_ = jsonObj.Set(path, val.Val())
		} else if defaultValue != nil {
			_ = jsonObj.Set(path, defaultValue)
		}
	}
	return jsonObj.Map()
}

// MapResponsePayload 映射模型响应为标准格式
func MapResponsePayload(mapping map[string]any, responseBytes []byte) ([]byte, error) {
	if len(mapping) == 0 {
		return responseBytes, nil
	}

	responseJson := gjson.New(responseBytes)
	resultJson := gjson.New("{}")

	for standardField, modelPath := range mapping {
		path := gconv.String(modelPath)
		if path == "" {
			continue
		}
		val := responseJson.Get(path)
		if val.IsNil() {
			continue
		}
		resultJson.Set(standardField, val.Val())
	}

	return []byte(resultJson.String()), nil
}

// ParseHeadMsgHeaders 支持多个 header 绑定，逗号分隔：
// 示例：
// - X-API-Key:qwen3-tts-key,operation:true,count:123
// - X-API-Key:"qwen3-tts-key",operation:"true"
//
// 说明：
// - HTTP Header 最终都是字符串，这里做的是“值的字符串化表达”。
// - 若 value 用双引号包裹，会去掉外层引号再注入，便于在配置中区分字符串/布尔/数字等表达（以及避免值中包含特殊字符时歧义）。
func ParseHeadMsgHeaders(headMsg string) map[string]string {
	headMsg = strings.TrimSpace(headMsg)
	if headMsg == "" {
		return nil
	}
	out := map[string]string{}
	parts := strings.Split(headMsg, ",")
	for _, p := range parts {
		p = strings.TrimSpace(p)
		if p == "" {
			continue
		}
		// HeaderName:HeaderValue（推荐） / HeaderName=HeaderValue（兼容）
		if strings.Contains(p, ":") {
			kv := strings.SplitN(p, ":", 2)
			k := strings.TrimSpace(kv[0])
			v := strings.TrimSpace(kv[1])
			v = strings.Trim(v, "\"")
			if k != "" && v != "" {
				out[k] = v
			}
			continue
		}
		if strings.Contains(p, "=") {
			kv := strings.SplitN(p, "=", 2)
			k := strings.TrimSpace(kv[0])
			v := strings.TrimSpace(kv[1])
			v = strings.Trim(v, "\"")
			if k != "" && v != "" {
				out[k] = v
			}
			continue
		}
	}
	if len(out) == 0 {
		return nil
	}
	return out
}

// PayloadToQuery 将 payload 转为 url.Values
func PayloadToQuery(payload map[string]any) (url.Values, error) {
	q := url.Values{}
	for k, v := range payload {
		if v == nil {
			continue
		}
		q.Set(k, gconv.String(v))
	}
	return q, nil
}