package repositories

import (
	"context"
	"sort"
	"time"
	"wm-backend/internal/mapper"
	"wm-backend/internal/models"
	db "wm-backend/sqlc_gen"

	"github.com/jackc/pgx/v5/pgtype"
)

func GetDashboardSummary(ctx context.Context, queries *db.Queries, warehouseID pgtype.Int8) (models.DashboardSummary, error) {
	totalStats, err := queries.GetTotalComponentStats(ctx, warehouseID)
	if err != nil {
		return models.DashboardSummary{}, err
	}

	pendingInvoices, err := queries.CountPendingInvoices(ctx)
	if err != nil {
		return models.DashboardSummary{}, err
	}

	lowStockCount, err := queries.CountLowStockComponents(ctx)
	if err != nil {
		return models.DashboardSummary{}, err
	}

	abnormalRows, err := queries.GetAbnormalItemCounts(ctx, warehouseID)
	if err != nil {
		return models.DashboardSummary{}, err
	}

	todayInvoiceRows, err := queries.GetTodayInvoiceCounts(ctx)
	if err != nil {
		return models.DashboardSummary{}, err
	}

	containerStats, err := queries.GetContainerStats(ctx, warehouseID)
	if err != nil {
		return models.DashboardSummary{}, err
	}

	abnormalAlerts := make([]models.AbnormalAlert, 0, len(abnormalRows))
	for _, r := range abnormalRows {
		abnormalAlerts = append(abnormalAlerts, mapper.ToDomainAbnormalAlert(r))
	}

	todayInvoices := make([]models.TodayInvoiceCount, 0, len(todayInvoiceRows))
	for _, r := range todayInvoiceRows {
		todayInvoices = append(todayInvoices, mapper.ToDomainTodayInvoiceCount(r))
	}

	return models.DashboardSummary{
		TotalComponents:    mapper.ToDomainTotalComponentStats(totalStats),
		PendingInvoices:    pendingInvoices,
		LowStockComponents: lowStockCount,
		AbnormalAlerts:     abnormalAlerts,
		TodayInvoices:      todayInvoices,
		EmptyContainers:    mapper.ToDomainContainerStats(containerStats),
	}, nil
}

func GetStockAlerts(ctx context.Context, queries *db.Queries) ([]models.StockAlert, error) {
	results, err := queries.GetStockAlerts(ctx)
	if err != nil {
		return nil, err
	}
	items := make([]models.StockAlert, 0, len(results))
	for _, r := range results {
		items = append(items, mapper.ToDomainStockAlert(r))
	}
	return items, nil
}

func GetAnomalyItems(ctx context.Context, queries *db.Queries, warehouseID pgtype.Int8) ([]models.AnomalyItem, error) {
	results, err := queries.GetAnomalyItems(ctx, warehouseID)
	if err != nil {
		return nil, err
	}
	items := make([]models.AnomalyItem, 0, len(results))
	for _, r := range results {
		items = append(items, mapper.ToDomainAnomalyItem(r))
	}
	return items, nil
}

func GetTransactionChartData(ctx context.Context, queries *db.Queries, startDate, endDate time.Time, warehouseID pgtype.Int8) (models.TransactionChartData, error) {
	results, err := queries.GetTransactionChartData(ctx, db.GetTransactionChartDataParams{
		StartDate:   startDate,
		EndDate:     endDate,
		WarehouseID: warehouseID,
	})
	if err != nil {
		return models.TransactionChartData{}, err
	}

	dateMap := make(map[string]*models.TransactionChartItem)
	for _, r := range results {
		row := mapper.ToDomainTransactionChartRow(r)
		dateStr := row.Date.Format("2006-01-02")
		if _, exists := dateMap[dateStr]; !exists {
			dateMap[dateStr] = &models.TransactionChartItem{
				Date:           dateStr,
				ImportQuantity: 0,
				ExportQuantity: 0,
			}
		}
		switch row.TransactionType {
		case "import":
			dateMap[dateStr].ImportQuantity = row.TotalQuantity
		case "export":
			dateMap[dateStr].ExportQuantity = row.TotalQuantity
		}
	}

	items := make([]models.TransactionChartItem, 0, len(dateMap))
	for _, item := range dateMap {
		items = append(items, *item)
	}
	sort.Slice(items, func(i, j int) bool {
		return items[i].Date < items[j].Date
	})

	return models.TransactionChartData{Items: items}, nil
}

func GetTopExportedComponents(ctx context.Context, queries *db.Queries, startDate, endDate time.Time, warehouseID pgtype.Int8, limitCount int32) ([]models.TopExportedComponent, error) {
	results, err := queries.GetTopExportedComponents(ctx, db.GetTopExportedComponentsParams{
		StartDate:   startDate,
		EndDate:     endDate,
		WarehouseID: warehouseID,
		LimitCount:  limitCount,
	})
	if err != nil {
		return nil, err
	}
	items := make([]models.TopExportedComponent, 0, len(results))
	for _, r := range results {
		items = append(items, mapper.ToDomainTopExportedComponent(r))
	}
	return items, nil
}