package condition

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"

	"service/internal/infrastructure/database"
	extapi "service/internal/worker/interface"
)

const trackerFile = "last_migrated_condition_id.txt"

type Config struct {
	DBManager       database.Service
	InternalBaseURL string
	InternalToken   string
	OrganizationID  string
}

type WorkerService interface {
	Run(ctx context.Context)
}

type worker struct {
	cfg       Config
	repo      Repository
	apiClient extapi.Client
}

func NewWorker(cfg Config) WorkerService {
	return &worker{
		cfg:       cfg,
		repo:      NewRepository(cfg.DBManager),
		apiClient: extapi.NewClient(15 * time.Second),
	}
}

func (w *worker) Run(ctx context.Context) {
	log.Println("[CONDITION WORKER] Memulai proses sinkronisasi ke API Satu Sehat...")
	lastID := w.readLastID()

	for {
		select {
		case <-ctx.Done():
			log.Println("[CONDITION WORKER] Proses dihentikan oleh sistem.")
			return
		default:
		}

		cond, err := w.repo.GetNextCondition(ctx, lastID)
		if err != nil {
			if err == sql.ErrNoRows {
				time.Sleep(5 * time.Second)
				continue
			}
			log.Printf("[CONDITION WORKER] Gagal mengambil data database: %v\n", err)
			time.Sleep(5 * time.Second)
			continue
		}

		log.Printf("[CONDITION WORKER] Memproses Diagnosa ID: %d\n", cond.IdxDiagnosa)
		internalPayload := MapToInternalAPI(cond, w.cfg.OrganizationID)
		reqURL := fmt.Sprintf("%s/satusehat/condition", strings.TrimRight(w.cfg.InternalBaseURL, "/"))

		respBody, statusCode, err := w.apiClient.PostJSON(ctx, reqURL, w.cfg.InternalToken, internalPayload)

		var status, errMsg, fhirID string
		if err != nil {
			status, errMsg = "FAILED", err.Error()
			log.Printf("[CONDITION WORKER] Gagal HTTP Request (ID %d): %v\n", cond.IdxDiagnosa, err)
		} else if statusCode != http.StatusOK && statusCode != http.StatusCreated {
			status, errMsg = "FAILED", fmt.Sprintf("HTTP %d", statusCode)
			log.Printf("[CONDITION WORKER] Gagal Response ID %d. HTTP: %d, Body: %s\n", cond.IdxDiagnosa, statusCode, string(respBody))
		} else {
			status = "SUCCESS"
			var result map[string]interface{}
			if errUnmarshal := json.Unmarshal(respBody, &result); errUnmarshal == nil {
				if data, ok := result["data"].(map[string]interface{}); ok {
					if id, ok := data["id"].(string); ok {
						fhirID = id
					}
				} else if id, ok := result["id"].(string); ok {
					fhirID = id
				}
			}
		}

		syncLog := MapToSyncLog(cond.IdxDiagnosa, fhirID, internalPayload, respBody, status, errMsg)
		_ = w.repo.SaveSyncLog(ctx, syncLog)

		if status == "SUCCESS" && fhirID != "" {
			_ = w.repo.SaveSatuSehatID(ctx, cond.IdxDiagnosa, fhirID)
		}

		w.updateTracker(&lastID, cond.IdxDiagnosa)
		time.Sleep(500 * time.Millisecond) // Rate limiting
	}
}

func (w *worker) updateTracker(lastID *int64, currentID int64) {
	*lastID = currentID
	os.WriteFile(trackerFile, []byte(strconv.FormatInt(*lastID, 10)), 0644)
}

func (w *worker) readLastID() int64 {
	data, _ := os.ReadFile(trackerFile)
	id, _ := strconv.ParseInt(strings.TrimSpace(string(data)), 10, 64)
	return id
}