package queries

import (
	"bssapp-backend/db"
	"bssapp-backend/internal/authz"
	"bssapp-backend/models"
	"context"
	"database/sql"
	"fmt"
	"strings"
)

func GetCustomerBalanceList(ctx context.Context, params models.CustomerBalanceListParams) ([]models.CustomerBalanceListRow, error) {
	// AuthZ bazli piyasa filtresi
	piyasaFilter := authz.BuildMSSQLPiyasaFilter(ctx, "D.Ozellik01")
	if strings.TrimSpace(piyasaFilter) == "" {
		piyasaFilter = "1=1"
	}

	// Dinamik WHERE insa et
	where := make([]string, 0, 16)
	where = append(where, "D.Islem_Tarihi < DATEADD(DAY, 1, @SecilenTarih)")
	where = append(where, piyasaFilter)

	if params.CariIlkGrup != "" {
		where = append(where, "D.Ozellik08 = @CariIlkGrup")
	}
	if params.Piyasa != "" {
		where = append(where, "D.Ozellik01 = @Piyasa")
	}
	if params.Temsilci != "" {
		where = append(where, "COALESCE(NULLIF(D.Ozellik02, ''), D.Ozellik09) = @Temsilci")
	}
	if params.RiskDurumu != "" {
		where = append(where, "D.Ozellik03 = @RiskDurumu")
	}
	if params.IslemTipi != "" {
		where = append(where, "D.PislemTipi = @IslemTipi")
	}
	if params.Ulke != "" {
		where = append(where, "D.Ozellik05 = @Ulke")
	}
	whereSQL := strings.Join(where, "\n      AND ")
	cariSearchLike := "%" + strings.TrimSpace(params.CariSearch) + "%"
	outerWhere := "1=1"
	if strings.TrimSpace(params.CariSearch) != "" {
		outerWhere = `(LEFT(B.CariKodu, 8) COLLATE Turkish_100_CI_AI LIKE @CariSearchLike
        OR B.CariKodu COLLATE Turkish_100_CI_AI LIKE @CariSearchLike
        OR B.CariDetay COLLATE Turkish_100_CI_AI LIKE @CariSearchLike
        OR AC.ANA_CARI_ADI COLLATE Turkish_100_CI_AI LIKE @CariSearchLike)`
	}

	const queryTemplate = `
;WITH CTE_ANA_CARI AS (
    SELECT
        ANA_CARI_KODU = LEFT(CariKodu, 8),
        CariDetay,
        rn = ROW_NUMBER() OVER (
            PARTITION BY LEFT(CariKodu, 8)
            ORDER BY CariKodu
        )
    FROM dbo.MK_CARI_ILETISIM WITH (NOLOCK)
),
ANA_CARI AS (
    SELECT
        ANA_CARI_KODU,
        CariDetay AS ANA_CARI_ADI
    FROM CTE_ANA_CARI
    WHERE rn = 1
),
BASE AS (
    SELECT
        D.SirketKodu,
        D.SirketDetay,
        D.CariKodu,
        D.CariDetay,
        D.CariDoviz,
        D.Ozellik01,
        D.Ozellik02,
        D.Ozellik03,
        D.Ozellik05,
        D.Ozellik06,
        D.Ozellik07,
        D.Ozellik08,
        D.Ozellik09,
        D.PislemTipi,
        D.Bakiye,
        D.KurBakiye,
        D.Son_Guncel_Kur
    FROM dbo.DENEME02DENEME AS D WITH (NOLOCK)
    WHERE %s
)
SELECT
    B.Ozellik08 AS CARI_ILK_GRUP,
    B.Ozellik01 AS PIYASA,
    COALESCE(NULLIF(B.Ozellik02, ''), B.Ozellik09) AS Temsilci,
    LEFT(B.SirketDetay, 10) AS Sirket,
    LEFT(B.CariKodu, 8) AS ANA_CARI_KODU,
    AC.ANA_CARI_ADI,
    B.CariKodu,
    B.CariDetay,
    B.Ozellik03,
    B.Ozellik05,
    B.Ozellik06,
    B.Ozellik07,
    B.CariDoviz,
	ISNULL(SUM(CASE WHEN B.PislemTipi = '1_2' THEN ISNULL(B.Bakiye, 0) ELSE 0 END), 0) AS Bakiye_1_2,
	ISNULL(SUM(CASE WHEN B.PislemTipi = '1_2' THEN ISNULL(B.KurBakiye, 0) ELSE 0 END), 0) AS TL_Bakiye_1_2,
	ISNULL(
		SUM(CASE WHEN B.PislemTipi = '1_2' THEN ISNULL(B.KurBakiye, 0) ELSE 0 END) / NULLIF(MIN(B.Son_Guncel_Kur), 0),
		0
	) AS USD_Bakiye_1_2,
	ISNULL(SUM(CASE WHEN B.PislemTipi = '1_3' THEN ISNULL(B.Bakiye, 0) ELSE 0 END), 0) AS Bakiye_1_3,
	ISNULL(SUM(CASE WHEN B.PislemTipi = '1_3' THEN ISNULL(B.KurBakiye, 0) ELSE 0 END), 0) AS TL_Bakiye_1_3,
	ISNULL(
		SUM(CASE WHEN B.PislemTipi = '1_3' THEN ISNULL(B.KurBakiye, 0) ELSE 0 END) / NULLIF(MIN(B.Son_Guncel_Kur), 0),
		0
	) AS USD_Bakiye_1_3,
	CAST(NULL AS int) AS Hesap_Alinmayan_Gun,
    CAST(NULL AS varchar(32)) AS Kalan_Fatura_Ortalama_Vade_Tarihi
FROM BASE AS B
LEFT JOIN ANA_CARI AS AC
    ON AC.ANA_CARI_KODU = LEFT(B.CariKodu, 8)
WHERE %s
GROUP BY
    B.Ozellik08,
    B.Ozellik01,
    COALESCE(NULLIF(B.Ozellik02, ''), B.Ozellik09),
    LEFT(B.SirketDetay, 10),
    LEFT(B.CariKodu, 8),
    AC.ANA_CARI_ADI,
    B.CariKodu,
    B.CariDetay,
    B.Ozellik03,
    B.Ozellik05,
    B.Ozellik06,
    B.Ozellik07,
    B.CariDoviz
ORDER BY
    LEFT(B.SirketDetay, 10),
    B.CariKodu
OPTION (RECOMPILE);
`
	query := fmt.Sprintf(queryTemplate, whereSQL, outerWhere)

	rows, err := db.MssqlDB.QueryContext(
		ctx,
		query,
		sql.Named("SecilenTarih", params.SelectedDate),
		sql.Named("CariIlkGrup", params.CariIlkGrup),
		sql.Named("Piyasa", params.Piyasa),
		sql.Named("Temsilci", params.Temsilci),
		sql.Named("RiskDurumu", params.RiskDurumu),
		sql.Named("IslemTipi", params.IslemTipi),
		sql.Named("Ulke", params.Ulke),
		sql.Named("CariSearchLike", cariSearchLike),
	)
	if err != nil {
		return nil, fmt.Errorf("MSSQL query error: %w", err)
	}
	defer rows.Close()

	out := make([]models.CustomerBalanceListRow, 0, 512)

	for rows.Next() {
		var r models.CustomerBalanceListRow
		if err := rows.Scan(
			&r.CariIlkGrup,
			&r.Piyasa,
			&r.Temsilci,
			&r.Sirket,
			&r.AnaCariKodu,
			&r.AnaCariAdi,
			&r.CariKodu,
			&r.CariDetay,
			&r.Ozellik03,
			&r.Ozellik05,
			&r.Ozellik06,
			&r.Ozellik07,
			&r.CariDoviz,
			&r.Bakiye12,
			&r.TLBakiye12,
			&r.USDBakiye12,
			&r.Bakiye13,
			&r.TLBakiye13,
			&r.USDBakiye13,
			&r.HesapAlinmayanGun,
			&r.KalanFaturaOrtalamaVadeTarihi,
		); err != nil {
			return nil, fmt.Errorf("row scan error: %w", err)
		}
		out = append(out, r)
	}

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

	return out, nil
}