package handlers

import (
	"api-service/internal/config"
	"api-service/internal/database"
	models "api-service/internal/models"
	"api-service/internal/models/patient"
	"api-service/internal/utils/validation"
	"context"
	"database/sql"
	"fmt"
	"log"
	"net/http"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/go-playground/validator/v10"
)

var (
	patientdb       database.Service
	patientonce     sync.Once
	patientvalidate *validator.Validate
)

// Initialize the database connection and validator
func init() {
	patientonce.Do(func() {
		patientdb = database.New(config.LoadConfig())
		patientvalidate = validator.New()
		patientvalidate.RegisterValidation("patient_status", validatePatientStatus)
		if patientdb == nil {
			log.Fatal("Failed to initialize database connection")
		}
	})
}

// Custom validation for patient status
func validatePatientStatus(fl validator.FieldLevel) bool {
	return models.IsValidStatus(fl.Field().String())
}

// PatientHandler handles patient services
type PatientHandler struct {
	db database.Service
}

// NewPatientHandler creates a new PatientHandler
func NewPatientHandler() *PatientHandler {
	return &PatientHandler{
		db: patientdb,
	}
}

// GetPatient godoc
// @Summary Get patient with pagination and optional aggregation
// @Description Returns a paginated list of patients with optional summary statistics
// @Tags Patient
// @Accept json
// @Produce json
// @Param limit query int false "Limit (max 100)" default(10)
// @Param offset query int false "Offset" default(0)
// @Param include_summary query bool false "Include aggregation summary" default(false)
// @Param status query string false "Filter by status"
// @Param search query string false "Search in multiple fields"
// @Success 200 {object} patient.PatientGetResponse "Success response"
// @Failure 400 {object} models.ErrorResponse "Bad request"
// @Failure 500 {object} models.ErrorResponse "Internal server error"
// @Router /patient/listpatient [get]
func (h *PatientHandler) GetPatient(c *gin.Context) {
	// Parse pagination parameters
	limit, offset, err := h.parsePaginationParams(c)
	if err != nil {
		h.respondError(c, "Invalid pagination parameters", err, http.StatusBadRequest)
		return
	}

	// Parse filter parameters
	filter := h.parseFilterParams(c)
	includeAggregation := c.Query("include_summary") == "true"

	// Get database connection
	dbConn, err := h.db.GetDB("db_antrean")
	if err != nil {
		h.logAndRespondError(c, "Database connection failed", err, http.StatusInternalServerError)
		return
	}

	// Create context with timeout
	ctx, cancel := context.WithTimeout(c.Request.Context(), 30*time.Second)
	defer cancel()

	// Execute concurrent operations
	var (
		items         []patient.Patient
		total         int
		aggregateData *models.AggregateData
		wg            sync.WaitGroup
		errChan       = make(chan error, 3)
		mu            sync.Mutex
	)

	// Fetch total count
	wg.Add(1)
	go func() {
		defer wg.Done()
		if err := h.getTotalCount(ctx, dbConn, filter, &total); err != nil {
			mu.Lock()
			errChan <- fmt.Errorf("failed to get total count: %w", err)
			mu.Unlock()
		}
	}()

	// Fetch main data
	wg.Add(1)
	go func() {
		defer wg.Done()
		result, err := h.fetchPatients(ctx, dbConn, filter, limit, offset)
		mu.Lock()
		if err != nil {
			errChan <- fmt.Errorf("failed to fetch data: %w", err)
		} else {
			items = result
		}
		mu.Unlock()
	}()

	// Fetch aggregation data if requested
	if includeAggregation {
		wg.Add(1)
		go func() {
			defer wg.Done()
			result, err := h.getAggregateData(ctx, dbConn, filter)
			mu.Lock()
			if err != nil {
				errChan <- fmt.Errorf("failed to get aggregate data: %w", err)
			} else {
				aggregateData = result
			}
			mu.Unlock()
		}()
	}

	// Wait for all goroutines
	wg.Wait()
	close(errChan)

	// Check for errors
	for err := range errChan {
		if err != nil {
			h.logAndRespondError(c, "Data processing failed", err, http.StatusInternalServerError)
			return
		}
	}

	// Build response
	meta := h.calculateMeta(limit, offset, total)
	response := patient.PatientGetResponse{
		Message: "Data patient berhasil diambil",
		Data:    items,
		Meta:    meta,
	}

	if includeAggregation && aggregateData != nil {
		response.Summary = aggregateData
	}

	c.JSON(http.StatusOK, response)
}

// GetPatientByIDPost godoc
// @Summary Get patient by ID using POST request
// @Description Retrieves a patient record by ID using POST request
// @Tags Patient
// @Accept json
// @Produce json
// @Param request body patient.PatientPostRequest true "Patient post request"
// @Success 200 {object} patient.PatientCreateResponse "Patient details retrieved successfully"
// @Failure 400 {object} models.ErrorResponse "Bad request or validation error"
// @Failure 404 {object} models.ErrorResponse "Patient not found"
// @Failure 500 {object} models.ErrorResponse "Internal server error"
// @Router /patient/detail [post]
func (h *PatientHandler) GetPatientByIDPost(c *gin.Context) {
	// id := c.Param("id")

	// Validate UUID format
	// if _, err := uuid.Parse(id); err != nil {
	// 	h.respondError(c, "Invalid ID format", err, http.StatusBadRequest)
	// 	return
	// }

	var req patient.PatientPostRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		h.respondError(c, "Invalid request body", err, http.StatusBadRequest)
		return
	}

	if err := patientvalidate.Struct(&req); err != nil {
		h.respondError(c, "Validation failed", err, http.StatusBadRequest)
		return
	}

	dbConn, err := h.db.GetDB("db_antrean")
	if err != nil {
		h.logAndRespondError(c, "Database connection failed", err, http.StatusInternalServerError)
		return
	}

	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()

	item, err := h.getPatientByIDPost(ctx, dbConn, &req)
	if err != nil {
		if err == sql.ErrNoRows {
			h.respondError(c, "Patient not found", err, http.StatusNotFound)
		} else {
			h.logAndRespondError(c, "Failed to get patient", err, http.StatusInternalServerError)
		}
		return
	}

	response := patient.PatientCreateResponse{
		Message: "patient details retrieved successfully",
		Data:    item,
	}

	c.JSON(http.StatusOK, response)
}

// CreatePatient godoc
// @Summary Create patient
// @Description Creates a new patient record
// @Tags Patient
// @Accept json
// @Produce json
// @Param request body patient.PatientCreateRequest true "Patient creation request"
// @Success 201 {object} patient.PatientCreateResponse "Patient created successfully"
// @Failure 400 {object} models.ErrorResponse "Bad request or validation error"
// @Failure 500 {object} models.ErrorResponse "Internal server error"
// @Router /patient [post]
func (h *PatientHandler) CreatePatient(c *gin.Context) {
	var req patient.PatientCreateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		h.respondError(c, "Invalid request body", err, http.StatusBadRequest)
		return
	}

	// Validate request
	if err := patientvalidate.Struct(&req); err != nil {
		h.respondError(c, "Validation failed", err, http.StatusBadRequest)
		return
	}

	dbConn, err := h.db.GetDB("db_antrean")
	if err != nil {
		h.logAndRespondError(c, "Database connection failed", err, http.StatusInternalServerError)
		return
	}

	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()

	// Validate duplicate and daily submission
	if err := h.validatePatientSubmission(ctx, dbConn, &req); err != nil {
		h.respondError(c, "Validation failed", err, http.StatusBadRequest)
		return
	}

	item, err := h.createPatient(ctx, dbConn, &req)
	if err != nil {
		h.logAndRespondError(c, "Failed to create patient", err, http.StatusInternalServerError)
		return
	}

	response := patient.PatientCreateResponse{
		Message: "Patient berhasil dibuat",
		Data:    item,
	}

	c.JSON(http.StatusCreated, response)
}

// UpdatePatient godoc
// @Summary Update patient
// @Description Updates an existing patient record
// @Tags Patient
// @Accept json
// @Produce json
// @Param id path integer true "Patient ID"
// @Param request body patient.PatientUpdateRequest true "Patient update request"
// @Success 200 {object} patient.PatientUpdateResponse "Patient updated successfully"
// @Failure 400 {object} models.ErrorResponse "Bad request or validation error"
// @Failure 404 {object} models.ErrorResponse "Patient not found"
// @Failure 500 {object} models.ErrorResponse "Internal server error"
// @Router /patient/{id} [put]
func (h *PatientHandler) UpdatePatient(c *gin.Context) {
	id := c.Param("id")

	// Validate UUID format
	// if _, err := uuid.Parse(id); err != nil {
	// 	h.respondError(c, "Invalid ID format", err, http.StatusBadRequest)
	// 	return
	// }

	// Validate ID is integer
	if _, err := strconv.Atoi(id); err != nil {
		h.respondError(c, "Invalid ID format", err, http.StatusBadRequest)
		return
	}

	var req patient.PatientUpdateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		h.respondError(c, "Invalid request body", err, http.StatusBadRequest)
		return
	}

	// Set ID from path parameter
	// req.ID = id
	idInt, _ := strconv.Atoi(id)
	req.ID = idInt

	// Validate request
	if err := patientvalidate.Struct(&req); err != nil {
		h.respondError(c, "Validation failed", err, http.StatusBadRequest)
		return
	}

	dbConn, err := h.db.GetDB("db_antrean")
	if err != nil {
		h.logAndRespondError(c, "Database connection failed", err, http.StatusInternalServerError)
		return
	}

	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()

	item, err := h.updatePatient(ctx, dbConn, &req)
	if err != nil {
		if err == sql.ErrNoRows {
			h.respondError(c, "Patient not found", err, http.StatusNotFound)
		} else {
			h.logAndRespondError(c, "Failed to update patient", err, http.StatusInternalServerError)
		}
		return
	}

	response := patient.PatientUpdateResponse{
		Message: "Patient berhasil diperbarui",
		Data:    item,
	}

	c.JSON(http.StatusOK, response)
}

// DeletePatient godoc
// @Summary Delete patient
// @Description Soft deletes a patient by setting status to 'deleted'
// @Tags Patient
// @Accept json
// @Produce json
// @Param id path integer true "Patient ID"
// @Success 200 {object} patient.PatientDeleteResponse "Patient deleted successfully"
// @Failure 400 {object} models.ErrorResponse "Invalid ID format"
// @Failure 404 {object} models.ErrorResponse "Patient not found"
// @Failure 500 {object} models.ErrorResponse "Internal server error"
// @Router /patient/{id} [delete]
func (h *PatientHandler) DeletePatient(c *gin.Context) {
	id := c.Param("id")

	// Validate ID is integer
	if _, err := strconv.Atoi(id); err != nil {
		h.respondError(c, "Invalid ID format", err, http.StatusBadRequest)
		return
	}

	dbConn, err := h.db.GetDB("db_antrean")
	if err != nil {
		h.logAndRespondError(c, "Database connection failed", err, http.StatusInternalServerError)
		return
	}

	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()

	err = h.deletePatient(ctx, dbConn, id)
	if err != nil {
		if err == sql.ErrNoRows {
			h.respondError(c, "Patient not found", err, http.StatusNotFound)
		} else {
			h.logAndRespondError(c, "Failed to delete patient", err, http.StatusInternalServerError)
		}
		return
	}

	response := patient.PatientDeleteResponse{
		Message: "Patient berhasil dihapus",
		ID:      id,
	}

	c.JSON(http.StatusOK, response)
}

// GetPatientStats godoc
// @Summary Get patient statistics
// @Description Returns comprehensive statistics about patient data
// @Tags Patient
// @Accept json
// @Produce json
// @Param status query string false "Filter statistics by status"
// @Success 200 {object} models.AggregateData "Statistics data"
// @Failure 500 {object} models.ErrorResponse "Internal server error"
// @Router /api/v1/patients/stats [get]
func (h *PatientHandler) GetPatientStats(c *gin.Context) {
	dbConn, err := h.db.GetDB("db_antrean")
	if err != nil {
		h.logAndRespondError(c, "Database connection failed", err, http.StatusInternalServerError)
		return
	}

	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()

	filter := h.parseFilterParams(c)
	aggregateData, err := h.getAggregateData(ctx, dbConn, filter)
	if err != nil {
		h.logAndRespondError(c, "Failed to get statistics", err, http.StatusInternalServerError)
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"message": "Statistik patient berhasil diambil",
		"data":    aggregateData,
	})
}

// Database operations
func (h *PatientHandler) getPatientByIDPost(ctx context.Context, dbConn *sql.DB, req *patient.PatientPostRequest) (*patient.Patient, error) {
	query := `SELECT id, name, medical_record_number, phone_number, gender, birth_date, address, active, fk_sd_provinsi_id, fk_sd_kabupaten_kota_id, fk_sd_kecamatan_id, fk_sd_kelurahan_id, ds_sd_provinsi, ds_sd_kabupaten_kota, ds_sd_kecamatan, ds_sd_kelurahan
	FROM master.ms_patient WHERE id = $1`

	row := dbConn.QueryRowContext(ctx, query, req.ID)

	var item patient.Patient
	err := row.Scan(&item.ID, &item.Name, &item.MedicalRecordNumber, &item.PhoneNumber, &item.Gender, &item.BirthDate, &item.Address, &item.Active, &item.FKSdProvinsiID, &item.FKSdKabupatenKotaID, &item.FKSdKecamatanID, &item.FKSdKelurahanID, &item.DsSdProvinsi, &item.DsSdKabupatenKota, &item.DsSdKecamatan, &item.DsSdKelurahan)
	if err != nil {
		return nil, err
	}

	return &item, nil
}

func (h *PatientHandler) createPatient(ctx context.Context, dbConn *sql.DB, req *patient.PatientCreateRequest) (*patient.Patient, error) {
	// id := uuid.New().String()
	// now := time.Now()

	query := `INSERT INTO master.ms_patient 
	(name, medical_record_number, phone_number, gender, birth_date, address, active, fk_sd_provinsi_id, fk_sd_kabupaten_kota_id, fk_sd_kecamatan_id, fk_sd_kelurahan_id, ds_sd_provinsi, ds_sd_kabupaten_kota, ds_sd_kecamatan, ds_sd_kelurahan) 
	VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15) 
	RETURNING id, name, medical_record_number, phone_number, gender, birth_date, address, active, fk_sd_provinsi_id, fk_sd_kabupaten_kota_id, fk_sd_kecamatan_id, fk_sd_kelurahan_id, ds_sd_provinsi, ds_sd_kabupaten_kota, ds_sd_kecamatan, ds_sd_kelurahan`

	row := dbConn.QueryRowContext(ctx, query, req.Name, req.MedicalRecordNumber, req.PhoneNumber, req.Gender, req.BirthDate, req.Address, req.Active, req.FKSdProvinsiID, req.FKSdKabupatenKotaID, req.FKSdKecamatanID, req.FKSdKelurahanID, req.DsSdProvinsi, req.DsSdKabupatenKota, req.DsSdKecamatan, req.DsSdKelurahan)

	var item patient.Patient
	err := row.Scan(&item.ID, &item.Name, &item.MedicalRecordNumber, &item.PhoneNumber, &item.Gender, &item.BirthDate, &item.Address, &item.Active, &item.FKSdProvinsiID, &item.FKSdKabupatenKotaID, &item.FKSdKecamatanID, &item.FKSdKelurahanID, &item.DsSdProvinsi, &item.DsSdKabupatenKota, &item.DsSdKecamatan, &item.DsSdKelurahan)
	if err != nil {
		return nil, fmt.Errorf("failed to create patient: %w", err)
	}

	return &item, nil
}

func (h *PatientHandler) updatePatient(ctx context.Context, dbConn *sql.DB, req *patient.PatientUpdateRequest) (*patient.Patient, error) {
	// now := time.Now()

	query := `UPDATE master.ms_patient
	SET name = $2, medical_record_number = $3, phone_number = $4, gender = $5, birth_date = $6, address = $7, active = $8, fk_sd_provinsi_id = $9, fk_sd_kabupaten_kota_id = $10, fk_sd_kecamatan_id = $11, fk_sd_kelurahan_id = $12, ds_sd_provinsi = $13, ds_sd_kabupaten_kota = $14, ds_sd_kecamatan = $15, ds_sd_kelurahan = $16
	WHERE id = $1
	RETURNING id, name, medical_record_number, phone_number, gender, birth_date, address, active, fk_sd_provinsi_id, fk_sd_kabupaten_kota_id, fk_sd_kecamatan_id, fk_sd_kelurahan_id, ds_sd_provinsi, ds_sd_kabupaten_kota, ds_sd_kecamatan, ds_sd_kelurahan`

	row := dbConn.QueryRowContext(ctx, query, req.ID, req.Name, req.MedicalRecordNumber, req.PhoneNumber, req.Gender, req.BirthDate, req.Address, req.Active, req.FKSdProvinsiID, req.FKSdKabupatenKotaID, req.FKSdKecamatanID, req.FKSdKelurahanID, req.DsSdProvinsi, req.DsSdKabupatenKota, req.DsSdKecamatan, req.DsSdKelurahan)

	var item patient.Patient
	err := row.Scan(&item.ID, &item.Name, &item.MedicalRecordNumber, &item.PhoneNumber, &item.Gender, &item.BirthDate, &item.Address, &item.Active, &item.FKSdProvinsiID, &item.FKSdKabupatenKotaID, &item.FKSdKecamatanID, &item.FKSdKelurahanID, &item.DsSdProvinsi, &item.DsSdKabupatenKota, &item.DsSdKecamatan, &item.DsSdKelurahan)
	if err != nil {
		return nil, fmt.Errorf("failed to update patient: %w", err)
	}

	return &item, nil
}

func (h *PatientHandler) deletePatient(ctx context.Context, dbConn *sql.DB, id string) error {
	// now := time.Now()
	query := `UPDATE master.ms_patient
	SET active = false
	WHERE id = $1`

	result, err := dbConn.ExecContext(ctx, query, id)
	if err != nil {
		return fmt.Errorf("failed to delete patient: %w", err)
	}

	rowsAffected, err := result.RowsAffected()
	if err != nil {
		return fmt.Errorf("failed to get affected rows: %w", err)
	}

	if rowsAffected == 0 {
		return sql.ErrNoRows
	}

	return nil
}

func (h *PatientHandler) fetchPatients(ctx context.Context, dbConn *sql.DB, filter patient.PatientFilter, limit, offset int) ([]patient.Patient, error) {
	whereClause, args := h.buildWhereClause(filter)
	query := fmt.Sprintf(`SELECT id, name, medical_record_number, phone_number, gender, birth_date, address, active, fk_sd_provinsi_id, fk_sd_kabupaten_kota_id, fk_sd_kecamatan_id, fk_sd_kelurahan_id, ds_sd_provinsi, ds_sd_kabupaten_kota, ds_sd_kecamatan, ds_sd_kelurahan
	FROM master.ms_patient
	WHERE %s LIMIT $%d OFFSET $%d`, whereClause, len(args)+1, len(args)+2)

	args = append(args, limit, offset)

	rows, err := dbConn.QueryContext(ctx, query, args...)
	if err != nil {
		return nil, fmt.Errorf("fetch patients query failed: %w", err)
	}
	defer rows.Close()

	items := make([]patient.Patient, 0, limit)
	for rows.Next() {
		item, err := h.scanPatient(rows)
		if err != nil {
			return nil, fmt.Errorf("scan Patient failed: %w", err)
		}
		items = append(items, item)
	}

	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("rows iteration error: %w", err)
	}

	log.Printf("Successfully fetched %d patients with filters applied", len(items))
	return items, nil
}

// Optimized scanning function
func (h *PatientHandler) scanPatient(rows *sql.Rows) (patient.Patient, error) {
	var item patient.Patient

	// Scan into individual fields to handle nullable types properly
	err := rows.Scan(
		&item.ID,
		&item.Name,
		&item.MedicalRecordNumber,
		&item.PhoneNumber,
		&item.Gender,
		&item.BirthDate,
		&item.Address,
		&item.Active,
		&item.FKSdProvinsiID,
		&item.FKSdKabupatenKotaID,
		&item.FKSdKecamatanID,
		&item.FKSdKelurahanID,
		&item.DsSdProvinsi,
		&item.DsSdKabupatenKota,
		&item.DsSdKecamatan,
		&item.DsSdKelurahan,
	)

	return item, err
}

func (h *PatientHandler) getTotalCount(ctx context.Context, dbConn *sql.DB, filter patient.PatientFilter, total *int) error {
	whereClause, args := h.buildWhereClause(filter)
	countQuery := fmt.Sprintf("SELECT COUNT(*) FROM master.ms_patient WHERE %s", whereClause)
	if err := dbConn.QueryRowContext(ctx, countQuery, args...).Scan(total); err != nil {
		return fmt.Errorf("total count query failed: %w", err)
	}
	return nil
}

// Get comprehensive aggregate data dengan filter support
func (h *PatientHandler) getAggregateData(ctx context.Context, dbConn *sql.DB, filter patient.PatientFilter) (*models.AggregateData, error) {
	aggregate := &models.AggregateData{
		ByStatus: make(map[string]int),
	}

	// Build where clause untuk filter
	whereClause, args := h.buildWhereClause(filter)

	// Use concurrent execution untuk performance
	var wg sync.WaitGroup
	var mu sync.Mutex
	errChan := make(chan error, 4)

	// 1. Count by status
	wg.Add(1)
	go func() {
		defer wg.Done()
		statusQuery := fmt.Sprintf("SELECT status, COUNT(*) FROM master.ms_patient WHERE %s GROUP BY status ORDER BY status", whereClause)

		rows, err := dbConn.QueryContext(ctx, statusQuery, args...)
		if err != nil {
			errChan <- fmt.Errorf("status query failed: %w", err)
			return
		}
		defer rows.Close()

		mu.Lock()
		for rows.Next() {
			var status string
			var count int
			if err := rows.Scan(&status, &count); err != nil {
				mu.Unlock()
				errChan <- fmt.Errorf("status scan failed: %w", err)
				return
			}
			aggregate.ByStatus[status] = count
			switch status {
			case "active":
				aggregate.TotalActive = count
			case "draft":
				aggregate.TotalDraft = count
			case "inactive":
				aggregate.TotalInactive = count
			}
		}
		mu.Unlock()

		if err := rows.Err(); err != nil {
			errChan <- fmt.Errorf("status iteration error: %w", err)
		}
	}()

	// 2. Get last updated time dan today statistics
	wg.Add(1)
	go func() {
		defer wg.Done()

		// Last updated
		lastUpdatedQuery := fmt.Sprintf("SELECT MAX(date_updated) FROM master.ms_patient WHERE %s AND date_updated IS NOT NULL", whereClause)
		var lastUpdated sql.NullTime
		if err := dbConn.QueryRowContext(ctx, lastUpdatedQuery, args...).Scan(&lastUpdated); err != nil {
			errChan <- fmt.Errorf("last updated query failed: %w", err)
			return
		}

		// Today statistics
		today := time.Now().Format("2006-01-02")
		todayStatsQuery := fmt.Sprintf(`
			SELECT 
				SUM(CASE WHEN DATE(date_created) = $%d THEN 1 ELSE 0 END) as created_today,
				SUM(CASE WHEN DATE(date_updated) = $%d AND DATE(date_created) != $%d THEN 1 ELSE 0 END) as updated_today
			FROM master.ms_patient 
			WHERE %s`, len(args)+1, len(args)+1, len(args)+1, whereClause)

		todayArgs := append(args, today)
		var createdToday, updatedToday int
		if err := dbConn.QueryRowContext(ctx, todayStatsQuery, todayArgs...).Scan(&createdToday, &updatedToday); err != nil {
			errChan <- fmt.Errorf("today stats query failed: %w", err)
			return
		}

		mu.Lock()
		if lastUpdated.Valid {
			aggregate.LastUpdated = &lastUpdated.Time
		}
		aggregate.CreatedToday = createdToday
		aggregate.UpdatedToday = updatedToday
		mu.Unlock()
	}()

	// Wait for all goroutines
	wg.Wait()
	close(errChan)

	// Check for errors
	for err := range errChan {
		if err != nil {
			return nil, err
		}
	}

	return aggregate, nil
}

// Enhanced error handling
func (h *PatientHandler) logAndRespondError(c *gin.Context, message string, err error, statusCode int) {
	log.Printf("[ERROR] %s: %v", message, err)
	h.respondError(c, message, err, statusCode)
}

func (h *PatientHandler) respondError(c *gin.Context, message string, err error, statusCode int) {
	errorMessage := message
	if gin.Mode() == gin.ReleaseMode {
		errorMessage = "Internal server error"
	}

	c.JSON(statusCode, models.ErrorResponse{
		Error:     errorMessage,
		Code:      statusCode,
		Message:   err.Error(),
		Timestamp: time.Now(),
	})
}

// Parse pagination parameters dengan validation yang lebih ketat
func (h *PatientHandler) parsePaginationParams(c *gin.Context) (int, int, error) {
	limit := 10 // Default limit
	offset := 0 // Default offset

	if limitStr := c.Query("limit"); limitStr != "" {
		parsedLimit, err := strconv.Atoi(limitStr)
		if err != nil {
			return 0, 0, fmt.Errorf("invalid limit parameter: %s", limitStr)
		}
		if parsedLimit <= 0 {
			return 0, 0, fmt.Errorf("limit must be greater than 0")
		}
		if parsedLimit > 100 {
			return 0, 0, fmt.Errorf("limit cannot exceed 100")
		}
		limit = parsedLimit
	}

	if offsetStr := c.Query("offset"); offsetStr != "" {
		parsedOffset, err := strconv.Atoi(offsetStr)
		if err != nil {
			return 0, 0, fmt.Errorf("invalid offset parameter: %s", offsetStr)
		}
		if parsedOffset < 0 {
			return 0, 0, fmt.Errorf("offset cannot be negative")
		}
		offset = parsedOffset
	}

	log.Printf("Pagination - Limit: %d, Offset: %d", limit, offset)
	return limit, offset, nil
}

func (h *PatientHandler) parseFilterParams(c *gin.Context) patient.PatientFilter {
	filter := patient.PatientFilter{}

	if status := c.Query("status"); status != "" {
		if models.IsValidStatus(status) {
			filter.Status = &status
		}
	}

	if search := c.Query("search"); search != "" {
		filter.Search = &search
	}

	// Parse date filters
	if dateFromStr := c.Query("date_from"); dateFromStr != "" {
		if dateFrom, err := time.Parse("2006-01-02", dateFromStr); err == nil {
			filter.DateFrom = &dateFrom
		}
	}

	if dateToStr := c.Query("date_to"); dateToStr != "" {
		if dateTo, err := time.Parse("2006-01-02", dateToStr); err == nil {
			filter.DateTo = &dateTo
		}
	}

	return filter
}

// Build WHERE clause dengan filter parameters
func (h *PatientHandler) buildWhereClause(filter patient.PatientFilter) (string, []interface{}) {
	conditions := []string{"1=1"}
	args := []interface{}{}
	paramCount := 1

	if filter.Status != nil {
		conditions = append(conditions, fmt.Sprintf("active = $%d", paramCount))
		args = append(args, *filter.Status)
		paramCount++
	}

	if filter.Search != nil {
		searchCondition := fmt.Sprintf("name ILIKE $%d", paramCount)
		conditions = append(conditions, searchCondition)
		searchTerm := "%" + *filter.Search + "%"
		args = append(args, searchTerm)
		paramCount++
	}

	// if filter.DateFrom != nil {
	// 	conditions = append(conditions, fmt.Sprintf("date_created >= $%d", paramCount))
	// 	args = append(args, *filter.DateFrom)
	// 	paramCount++
	// }

	// if filter.DateTo != nil {
	// 	conditions = append(conditions, fmt.Sprintf("date_created <= $%d", paramCount))
	// 	args = append(args, filter.DateTo.Add(24*time.Hour-time.Nanosecond))
	// 	paramCount++
	// }

	return strings.Join(conditions, " AND "), args
}

func (h *PatientHandler) calculateMeta(limit, offset, total int) models.MetaResponse {
	totalPages := 0
	currentPage := 1
	if limit > 0 {
		totalPages = (total + limit - 1) / limit // Ceiling division
		currentPage = (offset / limit) + 1
	}

	return models.MetaResponse{
		Limit:       limit,
		Offset:      offset,
		Total:       total,
		TotalPages:  totalPages,
		CurrentPage: currentPage,
		HasNext:     offset+limit < total,
		HasPrev:     offset > 0,
	}
}

// validatePatientSubmission performs validation for duplicate entries and daily submission limits
func (h *PatientHandler) validatePatientSubmission(ctx context.Context, dbConn *sql.DB, req *patient.PatientCreateRequest) error {
	// Import the validation utility
	validator := validation.NewDuplicateValidator(dbConn)

	// Use default configuration
	config := validation.ValidationConfig{
		TableName: "master.ms_patient",
		IDColumn:  "id",
		// StatusColumn:   "active",
		// DateColumn:     "date_created",
		ActiveStatuses: []string{"active"},
		AdditionalFields: map[string]interface{}{
			"name": req.Name,
		},
	}

	// Prepare fields for validation
	fields := map[string]interface{}{
		"name":   req.Name,
		"active": true,
	}

	// Validate duplicate entries with active status for today
	err := validator.ValidateDuplicateWithCustomFields(ctx, config, fields)
	if err != nil {
		return fmt.Errorf("validation failed: %w", err)
	}

	// Validate once per day submission
	// err = validator.ValidateOncePerDay(ctx, "master.ms_patient", "id", "date_created", "daily_limit")
	// if err != nil {
	// 	return fmt.Errorf("daily submission limit exceeded: %w", err)
	// }

	return nil
}

// Example usage of the validation utility with custom configuration
// func (h *PatientHandler) validateWithCustomConfig(ctx context.Context, dbConn *sql.DB, req *patient.PatientCreateRequest) error {
// 	// Create validator instance
// 	validator := validation.NewDuplicateValidator(dbConn)

// 	// Use custom configuration
// 	config := validation.ValidationConfig{
// 		TableName:      "master.ms_patient",
// 		IDColumn:       "id",
// 		StatusColumn:   "status",
// 		DateColumn:     "date_created",
// 		ActiveStatuses: []string{"active", "draft"},
// 		AdditionalFields: map[string]interface{}{
// 			"name": req.Name,
// 		},
// 	}

// 	// Validate with custom fields
// 	fields := map[string]interface{}{
// 		"name": *req.Name,
// 	}

// 	err := validator.ValidateDuplicateWithCustomFields(ctx, config, fields)
// 	if err != nil {
// 		return fmt.Errorf("custom validation failed: %w", err)
// 	}

// 	return nil
// }

// GetLastSubmissionTime example
func (h *PatientHandler) getLastSubmissionTimeExample(ctx context.Context, dbConn *sql.DB, identifier string) (*time.Time, error) {
	validator := validation.NewDuplicateValidator(dbConn)
	return validator.GetLastSubmissionTime(ctx, "master.ms_patient", "id", "date_created", identifier)
}