package repository

import (
	"context"
	"time"

	dbgen "github.com/SamuelTariku/FortuneBet-Backend/gen/db"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/jackc/pgx/v5/pgtype"
)

type DirectDepositRepository interface {
	CreateDirectDeposit(ctx context.Context, deposit *domain.DirectDeposit) error
	GetDirectDepositsByStatus(ctx context.Context, status string, page int, pageSize int) ([]domain.DirectDeposit, int64, error)
	ApproveDirectDeposit(ctx context.Context, depositID int, adminID int) error
	RejectDirectDeposit(ctx context.Context, depositID int, adminID int, reason string) error
	DeleteDirectDeposit(ctx context.Context, id int) error
	GetDirectDepositByID(ctx context.Context, id int) (*domain.DirectDeposit, error)
}

type DirectDepositRepo struct {
	store *Store
}

func NewDirectDepositRepository(store *Store) DirectDepositRepository {
	return &DirectDepositRepo{store: store}
}

func (r *DirectDepositRepo) CreateDirectDeposit(ctx context.Context, deposit *domain.DirectDeposit) error {
	params := dbgen.CreateDirectDepositParams{
		CustomerID:         pgtype.Int8{Int64: int64(deposit.CustomerID)},
		WalletID:           pgtype.Int8{Int64: int64(deposit.WalletID)},
		BankName:           pgtype.Text{String: deposit.BankName},
		AccountNumber:      pgtype.Text{String: deposit.AccountNumber},
		AccountHolder:      pgtype.Text{String: deposit.AccountHolder},
		Amount:             pgtype.Numeric{Exp: int32(deposit.Amount)},
		ReferenceNumber:    pgtype.Text{String: deposit.ReferenceNumber},
		TransferScreenshot: pgtype.Text{String: deposit.TransferScreenshot},
	}

	dbDeposit, err := r.store.queries.CreateDirectDeposit(ctx, params)
	if err != nil {
		return err
	}

	// Map back to domain struct
	deposit.ID = int(dbDeposit.ID)
	deposit.Status = dbDeposit.Status.String
	deposit.CreatedAt = dbDeposit.CreatedAt.Time

	return nil
}

func (r *DirectDepositRepo) GetDirectDepositsByStatus(
	ctx context.Context,
	status string,
	page int,
	pageSize int,
) ([]domain.DirectDeposit, int64, error) {

	// Default pagination rules
	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 100 {
		pageSize = 50
	}
	offset := (page - 1) * pageSize

	params := dbgen.GetDirectDepositsByStatusParams{
		Status: pgtype.Text{String: status},
		Limit:  int32(pageSize),
		Offset: int32(offset),
	}

	dbItems, err := r.store.queries.GetDirectDepositsByStatus(ctx, params)
	if err != nil {
		return nil, 0, err
	}

	total, err := r.store.queries.CountDirectDepositsByStatus(ctx, pgtype.Text{String: status})
	if err != nil {
		return nil, 0, err
	}

	deposits := make([]domain.DirectDeposit, len(dbItems))
	for i, d := range dbItems {
		deposits[i] = *mapDBDirectDepositToDomain(&d)
	}

	return deposits, total, nil
}

func (r *DirectDepositRepo) ApproveDirectDeposit(
	ctx context.Context,
	depositID int,
	adminID int,
) error {

	params := dbgen.ApproveDirectDepositParams{
		ID:         int64(depositID),
		ApprovedBy: pgtype.Int8{Int64: int64(adminID)},
	}

	err := r.store.queries.ApproveDirectDeposit(ctx, params)
	if err != nil {
		return err
	}

	return nil
}

func (r *DirectDepositRepo) GetDirectDepositByID(
	ctx context.Context,
	id int,
) (*domain.DirectDeposit, error) {

	dbDeposit, err := r.store.queries.GetDirectDepositByID(ctx, int64(id))
	if err != nil {
		return nil, err
	}

	deposit := mapDBDirectDepositToDomain(&dbDeposit)
	return deposit, nil
}

func (r *DirectDepositRepo) DeleteDirectDeposit(
	ctx context.Context,
	id int,
) error {

	err := r.store.queries.DeleteDirectDeposit(ctx, int64(id))
	if err != nil {
		return err
	}

	return nil
}

func (r *DirectDepositRepo) RejectDirectDeposit(
	ctx context.Context,
	depositID int,
	adminID int,
	reason string,
) error {

	params := dbgen.RejectDirectDepositParams{
		ID:              int64(depositID),
		ApprovedBy:      pgtype.Int8{Int64: int64(adminID)},
		RejectionReason: pgtype.Text{String: reason},
	}

	err := r.store.queries.RejectDirectDeposit(ctx, params)
	if err != nil {
		return err
	}

	return nil
}

func mapDBDirectDepositToDomain(d *dbgen.DirectDeposit) *domain.DirectDeposit {
	var approvedBy *int
	if d.ApprovedBy.Valid {
		v := int(d.ApprovedBy.Int64)
		approvedBy = &v
	}

	var approvedAt *time.Time
	if d.ApprovedAt.Valid {
		t := d.ApprovedAt.Time
		approvedAt = &t
	}

	var rejectionReason *string
	if d.RejectionReason.Valid {
		r := d.RejectionReason.String
		rejectionReason = &r
	}

	return &domain.DirectDeposit{
		ID:                 int(d.ID),
		CustomerID:         int(d.CustomerID.Int64),
		WalletID:           int(d.WalletID.Int64),
		BankName:           d.BankName.String,
		AccountNumber:      d.AccountNumber.String,
		AccountHolder:      d.AccountHolder.String,
		Amount:             float64(d.Amount.Exp),
		ReferenceNumber:    d.ReferenceNumber.String,
		TransferScreenshot: d.TransferScreenshot.String,
		Status:             d.Status.String,
		CreatedAt:          d.CreatedAt.Time,
		ApprovedBy:         approvedBy,
		ApprovedAt:         approvedAt,
		RejectionReason:    rejectionReason,
	}
}