package middleware

import (
	"net/url"
	"strings"

	"code.tczkiot.com/wlw/ai-agent/internal/pkg/httpx"
	"code.tczkiot.com/wlw/ai-agent/internal/services"

	"github.com/gin-gonic/gin"
)

func ExternalUserMiddleware(ctx *gin.Context) {
	channel := services.ChannelService.GetEnabledChannel(ctx)
	if channel == nil {
		httpx.AbortJSON(ctx, 200, httpx.JsonErrorMsg(ctx, "error.e0210"))
		return
	}
	external, err := services.SubjectService.ResolveExternal(
		ctx.Request.Context(),
		requestExternalValue(ctx, "X-External-Id", "external_id"),
		decodeExternalName(requestExternalValue(ctx, "X-External-Name", "external_name")),
	)
	if err != nil {
		httpx.AbortJSON(ctx, 200, httpx.JsonErrorMsg(ctx, "error.auth.expired"))
		return
	}
	httpx.SetExternalUser(ctx, external)
	ctx.Next()
}

func requestExternalValue(ctx *gin.Context, header, query string) string {
	if value := strings.TrimSpace(ctx.GetHeader(header)); value != "" {
		return value
	}
	return strings.TrimSpace(ctx.Query(query))
}

func decodeExternalName(value string) string {
	decoded, err := url.QueryUnescape(strings.TrimSpace(value))
	if err != nil {
		return strings.TrimSpace(value)
	}
	return strings.TrimSpace(decoded)
}