package main

import (
	"bytes"
	"context"
	"encoding/json"
	"git.apinb.com/bsm-sdk/core/printer"
	"git.apinb.com/heqiapp/platforms/backend/worker/internal/config"
	"git.apinb.com/heqiapp/platforms/backend/worker/internal/impl"
	"io"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
)

func main() {
	config.New("PlatformWorker")
	impl.NewImpl()
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	go closeExpiredPayments(ctx)
	go dispatchIoTOutbox(ctx)
	printer.Info("[BSM - PlatformWorker] payment scheduler and IoT Outbox dispatcher started")
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit
	cancel()
}
func closeExpiredPayments(ctx context.Context) {
	ticker := time.NewTicker(time.Duration(config.Spec.PaymentAPI.IntervalSeconds) * time.Second)
	defer ticker.Stop()
	client := &http.Client{Timeout: 15 * time.Second}
	for {
		select {
		case <-ctx.Done():
			return
		case <-ticker.C:
			request, err := http.NewRequestWithContext(ctx, http.MethodPost, config.Spec.PaymentAPI.BaseURL+"/heqi/internal/v1/payment/close-expired", bytes.NewReader(nil))
			if err != nil {
				continue
			}
			request.Header.Set("X-Heqi-Worker-Token", config.Spec.PaymentAPI.Token)
			response, err := client.Do(request)
			if err == nil {
				_ = response.Body.Close()
			}
		}
	}
}

type iotOutbox struct {
	Identity        string `json:"identity"`
	CommandIdentity string `json:"command_identity"`
	Payload         string `json:"payload"`
}

func dispatchIoTOutbox(ctx context.Context) {
	ticker := time.NewTicker(time.Duration(config.Spec.IoTAPI.IntervalMilliseconds) * time.Millisecond)
	defer ticker.Stop()
	client := &http.Client{Timeout: 15 * time.Second}
	for {
		select {
		case <-ctx.Done():
			return
		case <-ticker.C:
			request, err := http.NewRequestWithContext(ctx, http.MethodGet, config.Spec.IoTAPI.PlatformBaseURL+"/heqi/internal/v1/iot/outbox/next", nil)
			if err != nil {
				continue
			}
			request.Header.Set("X-Heqi-Iot-Token", config.Spec.IoTAPI.Token)
			response, err := client.Do(request)
			if err != nil {
				continue
			}
			if response.StatusCode == http.StatusNoContent {
				_ = response.Body.Close()
				continue
			}
			if response.StatusCode != http.StatusOK {
				_ = response.Body.Close()
				continue
			}
			var outbox iotOutbox
			err = json.NewDecoder(io.LimitReader(response.Body, 1<<20)).Decode(&outbox)
			_ = response.Body.Close()
			if err != nil {
				continue
			}
			var payload map[string]any
			if json.Unmarshal([]byte(outbox.Payload), &payload) != nil {
				completeIoTOutbox(ctx, client, outbox.Identity, false, 0, "IOT_OUTBOX_PAYLOAD_INVALID")
				continue
			}
			payload["identity"] = outbox.CommandIdentity
			body, _ := json.Marshal(payload)
			dispatch, err := http.NewRequestWithContext(ctx, http.MethodPost, config.Spec.IoTAPI.GatewayBaseURL+"/v1/device-commands", bytes.NewReader(body))
			if err != nil {
				continue
			}
			dispatch.Header.Set("Content-Type", "application/json")
			dispatch.Header.Set("X-Heqi-Iot-Token", config.Spec.IoTAPI.Token)
			dispatchResponse, err := client.Do(dispatch)
			if err != nil {
				completeIoTOutbox(ctx, client, outbox.Identity, false, 0, "IOT_GATEWAY_UNAVAILABLE")
				continue
			}
			var result struct {
				PacketNumber uint16 `json:"packet_number"`
			}
			decodeErr := json.NewDecoder(io.LimitReader(dispatchResponse.Body, 1<<20)).Decode(&result)
			status := dispatchResponse.StatusCode
			_ = dispatchResponse.Body.Close()
			success := (status == http.StatusAccepted || status == http.StatusOK) && decodeErr == nil
			errorCode := ""
			if !success {
				errorCode = "IOT_GATEWAY_REJECTED"
			}
			completeIoTOutbox(ctx, client, outbox.Identity, success, result.PacketNumber, errorCode)
		}
	}
}
func completeIoTOutbox(ctx context.Context, client *http.Client, identity string, success bool, packet uint16, errorCode string) {
	body, _ := json.Marshal(map[string]any{"success": success, "packet_number": packet, "error_code": errorCode})
	request, err := http.NewRequestWithContext(ctx, http.MethodPost, config.Spec.IoTAPI.PlatformBaseURL+"/heqi/internal/v1/iot/outbox/"+identity+"/result", bytes.NewReader(body))
	if err != nil {
		return
	}
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("X-Heqi-Iot-Token", config.Spec.IoTAPI.Token)
	response, err := client.Do(request)
	if err == nil {
		_ = response.Body.Close()
	}
}