package face

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
	"time"

	"lone-services/pkg/utils"
)

const faceEmbeddingDim = 512

type insightFaceResp struct {
	Embedding []float32 `json:"embedding"`
	Error     string    `json:"error"`
}

func GetFaceVector(imagePath string) ([]float32, error) {
	host := utils.GetConfigString("services.skin_py_face_host")
	apiPath := utils.GetConfigString("services.skin_py_face_path")
	if host == utils.StringEmpty || apiPath == utils.StringEmpty {
		return nil, fmt.Errorf("insightface config empty")
	}
	url := strings.TrimRight(host, "/") + apiPath

	body, err := json.Marshal(map[string]string{"path": imagePath})
	if err != nil {
		return nil, fmt.Errorf("marshal request: %w", err)
	}
	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(body))
	if err != nil {
		return nil, fmt.Errorf("create request: %w", err)
	}
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("read response: %w", err)
	}
	if resp.StatusCode != http.StatusOK {
		var errResp insightFaceResp
		_ = json.Unmarshal(respBody, &errResp)
		return nil, fmt.Errorf("face extraction failed (status %d): %s", resp.StatusCode, errResp.Error)
	}

	var result insightFaceResp
	if err = json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("parse response: %w", err)
	}
	if len(result.Embedding) != faceEmbeddingDim {
		return nil, fmt.Errorf("invalid embedding dimension: %d", len(result.Embedding))
	}
	return result.Embedding, nil
}