package render

import (
	"fmt"
	"net/url"
	"strings"

	"github.com/peterqiu0516/sub-store/internal/model"
	"github.com/peterqiu0516/sub-store/internal/util"
)

// filterInvalidProxies removes nodes missing required server/port fields.
// These would cause client-side errors (e.g. sing-box "missing server_port").
func filterInvalidProxies(proxies []model.ProxyNode) []model.ProxyNode {
	result := make([]model.ProxyNode, 0, len(proxies))
	for _, p := range proxies {
		if p == nil {
			continue
		}
		server := getString(p, "server")
		port := getInt(p, "port")
		if server == "" || port <= 0 {
			continue
		}
		result = append(result, p)
	}
	return result
}

// RenderTarget dispatches to the appropriate renderer based on target.
// This is the simplified entry point matching renderTarget() in the reference.
func RenderTarget(proxies []model.ProxyNode, target string, template map[string]any) (string, error) {
	proxies = filterInvalidProxies(proxies)
	if len(proxies) == 0 {
		return "", fmt.Errorf("No supported nodes for %s output", target)
	}
	switch target {
	case model.TargetMihomo, model.TargetStash:
		return RenderMihomoYaml(proxies, "https://sub-store.local/convert", template), nil
	case model.TargetSurge:
		return RenderSurgeProxies(proxies)
	case model.TargetSurgeMac:
		return RenderSurgeMacProxies(proxies)
	case model.TargetSurfboard:
		return RenderSurfboardProxies(proxies)
	case model.TargetLoon:
		return RenderLoonProxies(proxies)
	case model.TargetEgern:
		return RenderEgernYaml(proxies)
	case model.TargetQX:
		return RenderQxProxies(proxies)
	case model.TargetSingBox:
		return RenderSingBoxWithTemplate(proxies, template), nil
	case model.TargetV2ray:
		return util.Base64Utf8(RenderProxyUris(proxies)), nil
	case model.TargetURI, model.TargetShadowrocket:
		return RenderProxyUris(proxies), nil
	case model.TargetJSON:
		return RenderJson(proxies), nil
	default:
		return RenderMihomoYaml(proxies, "https://sub-store.local/convert", template), nil
	}
}

// RenderBuildTarget dispatches with a request URL for mihomo source comments.
func RenderBuildTarget(proxies []model.ProxyNode, target string, requestUrl string, template map[string]any) (string, error) {
	proxies = filterInvalidProxies(proxies)
	if len(proxies) == 0 {
		return "", fmt.Errorf("No supported nodes for %s output", target)
	}
	switch target {
	case model.TargetMihomo, model.TargetStash:
		return RenderMihomoYaml(proxies, requestUrl, template), nil
	case model.TargetSurge:
		return RenderSurgeProxies(proxies)
	case model.TargetSurgeMac:
		return RenderSurgeMacProxies(proxies)
	case model.TargetSurfboard:
		return RenderSurfboardProxies(proxies)
	case model.TargetLoon:
		return RenderLoonProxies(proxies)
	case model.TargetEgern:
		return RenderEgernYaml(proxies)
	case model.TargetShadowrocket:
		return RenderProxyUris(proxies), nil
	case model.TargetQX:
		return RenderQxProxies(proxies)
	case model.TargetSingBox:
		return RenderSingBoxWithTemplate(proxies, template), nil
	case model.TargetV2ray:
		return util.Base64Utf8(RenderProxyUris(proxies)), nil
	case model.TargetURI:
		return RenderProxyUris(proxies), nil
	case model.TargetJSON:
		return RenderJson(proxies), nil
	default:
		return RenderMihomoYaml(proxies, requestUrl, template), nil
	}
}

// sourcePath extracts the path portion of requestUrl for the YAML header comment.
func sourcePath(requestUrl string) string {
	if u, err := url.Parse(requestUrl); err == nil && u.Path != "" {
		return u.Path
	}
	return strings.TrimPrefix(requestUrl, "https://")
}