package alert_manager

import (
	"encoding/json"
	"fmt"
	"github.com/gofiber/fiber/v2"
	"time"
)

type Alert struct {
	StartsAT     time.Time         `json:"startsAt"`
	EndsAT       time.Time         `json:"endsAt"`
	Annotations  map[string]string `json:"annotations"`
	Labels       map[string]string `json:"labels"`
	GeneratorURL string            `json:"generatorURL"`
}

type AlertManagerCfg struct {
	AlertManagerHttpURL string `env:"ALERT_MANAGER_HTTP_URL"`
}

type Client struct {
	baseURL    string
	httpClient *fiber.Client
}

func NewClient(cfg AlertManagerCfg) *Client {
	httpClient := fiber.AcquireClient()
	return &Client{
		baseURL:    cfg.AlertManagerHttpURL,
		httpClient: httpClient,
	}
}

func (c *Client) SendAlerts(alerts []Alert) error {
	url := c.baseURL + "/api/v2/alerts"

	requestBody, err := json.Marshal(alerts)
	if err != nil {
		return err
	}

	agent := c.httpClient.Post(url)
	agent.Set("Content-Type", "application/json").Body(requestBody)

	statusCode, respBody, errs := agent.Bytes()
	if len(errs) > 0 {
		return fmt.Errorf("%v", errs)
	}

	if statusCode != fiber.StatusOK {
		return fmt.Errorf("invalid status code from alert manager: %d, response body:%s", statusCode, string(respBody))
	}

	return nil
}