// {{AGENT_NAME}} — SentryAgent.ai agent starter
// Agent ID: {{AGENT_ID}}
package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"strings"

	"github.com/joho/godotenv"
)

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int    `json:"expires_in"`
}

func main() {
	_ = godotenv.Load()

	apiURL := getEnv("AGENTIDP_API_URL", "{{API_URL}}")
	clientID := os.Getenv("AGENTIDP_CLIENT_ID")
	clientSecret := os.Getenv("AGENTIDP_CLIENT_SECRET")

	if clientID == "" || clientSecret == "" {
		fmt.Fprintln(os.Stderr, "Error: AGENTIDP_CLIENT_ID and AGENTIDP_CLIENT_SECRET must be set")
		os.Exit(1)
	}

	fmt.Printf("Issuing token for agent {{AGENT_ID}} at %s ...\n", apiURL)

	form := url.Values{}
	form.Set("grant_type", "client_credentials")
	form.Set("client_id", clientID)
	form.Set("client_secret", clientSecret)
	form.Set("scope", "agents:read")

	resp, err := http.Post(apiURL+"/api/v1/token", "application/x-www-form-urlencoded", strings.NewReader(form.Encode()))
	if err != nil {
		fmt.Fprintf(os.Stderr, "Request failed: %v\n", err)
		os.Exit(1)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		fmt.Fprintf(os.Stderr, "Token issuance failed: HTTP %d\n", resp.StatusCode)
		os.Exit(1)
	}

	var token TokenResponse
	if err := json.NewDecoder(resp.Body).Decode(&token); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to decode response: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("✓ Token issued successfully!")
	fmt.Printf("  Expires in: %ds\n", token.ExpiresIn)
	truncated := token.AccessToken
	if len(truncated) > 20 {
		truncated = truncated[:20]
	}
	fmt.Printf("  Token (first 20 chars): %s...\n", truncated)
}

func getEnv(key, defaultVal string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return defaultVal
}