package client

import (
	"context"
	"encoding/json"
	"errors"
	"io"
	"log/slog"
	"sync"
	"time"

	"git.savin.nyc/alex/go-iar-notificator/config"
	resty "resty.dev/v3"
)

const (
	GET  = "GET"
	POST = "POST"
)

// Config holds the API configuration
// type Config struct {
// 	URL          string
// 	SecretKey    string
// 	AuthToken    string
// 	SubscriberID int
// 	PagerGroupID string
// }

// Client represents a MySubaru API client that interacts with the MySubaru API.
type Client struct {
	credentials *config.Credentials
	IAR         IaR
	HTTPClient  *resty.Client
	isAlive     bool
	logger      *slog.Logger
	sync.RWMutex
}

type IaR struct {
	PagerGroupID   string
	PagerGroupName string
	Type           string
	KeepAlive      time.Duration
}

// New function creates a New MySubaru API client
func New(credentials *config.Credentials, logger *slog.Logger) (*Client, error) {

	client := &Client{
		credentials: credentials,
		IAR: IaR{
			PagerGroupID:   "",
			PagerGroupName: "",
			Type:           "",
			KeepAlive:      15 * time.Minute,
		},
		isAlive: false,
		logger:  logger,
	}

	httpClient := resty.New()
	httpClient.
		SetBaseURL("https://ttd.iamresponding.com/ttd").
		SetHeaders(map[string]string{
			"User-Agent":      "python-requests/2.22.0",
			"Accept-Encoding": "gzip, deflate",
			"Accept":          "*/*",
			"Connection":      "keep-alive",
			"Content-Type":    "application/json",
			"SecretKey":       client.credentials.SecretKey,
			"Authorization":   "TTDApiKey " + client.credentials.TTDApiKey,
		},
		)

	client.HTTPClient = httpClient
	return client, nil
}

func (c *Client) KeepAlive() error {
	query := `query {getMutualPagerGroupsList {_id subscriberId name type tone_tolerance gaplength ignore_after record_delay record_seconds release_time playback_during_record post_email_command alert_command atone btone atonelength btonelength longtone longtonelength createDate},getTTDSetting(keySetting: "pollingSeconds"){keySetting keyValue}}`
	resp, err := c.execute(POST, "", map[string]string{"query": query})
	if err != nil {
		return err
	}
	if resp != nil && len(resp.Data.GetMutualPagerGroupsList) > 0 {
		pg := resp.Data.GetMutualPagerGroupsList[0]
		c.IAR.PagerGroupID = pg.ID
		c.IAR.PagerGroupName = pg.Name
		c.IAR.Type = pg.Type
		c.IAR.KeepAlive = time.Duration(resp.Data.GetTTDSetting.KeyValue) * time.Second
	}
	return nil
}

func (c *Client) PreAlert() (string, error) {
	ttdReceivedDate := time.Now().UTC().Format(time.RFC3339)
	query := `mutation {addAlert(ttdReceivedDate: "` + ttdReceivedDate + `", pagerGroup: ["` + c.IAR.PagerGroupID + `"]){_id textAlert pagerGroup subscriberId}}`
	resp, err := c.execute(POST, "", map[string]string{"query": query})
	if err != nil {
		return "", err
	}
	return resp.Data.AddAlert.ID, nil
}

func (c *Client) Alert(audioBase64 string) error {
	var err error
	var alertID string
	ttdReceivedDate := time.Now().UTC().Format(time.RFC3339)
	if alertID, err = c.PreAlert(); err != nil {
		return errors.New("failed to create pre-alert")
	}
	query := `mutation {addAlert(_id: "` + alertID + `", ttdReceivedDate: "` + ttdReceivedDate + `", pagerGroup: ["` + c.IAR.PagerGroupID + `"], audio: "` + audioBase64 + `"){_id textAlert pagerGroup audioUrl subscriberId}}`
	resp, err := c.execute(POST, "", map[string]string{"query": query})
	if err != nil {
		return err
	}
	c.logger.Info("Alert sent successfully", "alertID", resp.Data.AddAlert.ID, "audioURL", resp.Data.AddAlert.AudioUrl)

	return nil
}

// ServeKeepAlive starts a goroutine that sends keep-alive requests at the specified interval.
func (c *Client) ServeKeepAlive(ctx context.Context) {
	ticker := time.NewTicker(c.IAR.KeepAlive)
	defer ticker.Stop()

	slog.Info("Starting keep-alive sender", slog.Duration("interval", c.IAR.KeepAlive))

	for {
		select {
		case <-ctx.Done():
			slog.Info("Stopping keep-alive sender")
			return
		case <-ticker.C:
			if err := c.KeepAlive(); err != nil {
				slog.Error("Failed to send keep-alive", "error", err)
			} else {
				slog.Info("Sent keep-alive successfully")
			}
		}
	}
}

// IsAlive checks if the Client instance is alive
func (c *Client) IsAlive() bool {
	return c.isAlive
}

// execute executes an HTTP request based on the method, URL, and parameters provided.
func (c *Client) execute(method string, url string, params map[string]string) (*Response, error) {
	c.Lock()
	var resp *resty.Response
	var err error
	c.logger.Debug("executing http request", "method", method, "url", url, "params", params)

	// POST Requests
	if method == POST {
		resp, err = c.HTTPClient.
			R().
			SetBody(params).
			Post(url)
		if err != nil {
			c.logger.Error("error while executing POST request", "request", "execute", "method", method, "url", url, "error", err.Error())
			return nil, err
		}
		c.logger.Debug("executed POST request", "method", method, "url", url, "params", params)
	}

	if resp.IsSuccess() {
		resBytes, err := io.ReadAll(resp.Body)
		if err != nil {
			c.logger.Error("error while getting body", "error", err.Error())
		}
		c.logger.Debug("parsed http request output", "data", string(resBytes))

		c.HTTPClient.SetCookies(resp.Cookies())

		var r Response
		if err := json.Unmarshal(resBytes, &r); err != nil {
			c.logger.Error("error while unmarshalling response", "error", err.Error())
			c.isAlive = false
			c.Unlock()
			return nil, err
		}
		c.isAlive = true
		c.Unlock()
		return &r, nil
	}
	c.isAlive = false
	c.Unlock()
	return nil, errors.New("request is not successfull, HTTP code: " + resp.Status())
}