package repository

import (
	"context"
	"errors"
	"fmt"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"

	"github.com/geo-platform/tenant-api/internal/ops/domain"
)

var ErrSiteDomainMappingNotFound = errors.New("site domain mapping not found")

type SiteDomainMappingRepository struct {
	pool *pgxpool.Pool
}

func NewSiteDomainMappingRepository(pool *pgxpool.Pool) *SiteDomainMappingRepository {
	return &SiteDomainMappingRepository{pool: pool}
}

const siteDomainMappingColumns = `id, registrable_domain, site_key, site_name, is_active, created_at, updated_at`

type SiteDomainMappingFilter struct {
	Keyword  string
	IsActive *bool
	Limit    int
	Offset   int
}

type CreateSiteDomainMappingInput struct {
	RegistrableDomain string
	SiteKey           string
	SiteName          string
	IsActive          bool
}

type UpdateSiteDomainMappingInput struct {
	RegistrableDomain string
	SiteKey           string
	SiteName          string
	IsActive          bool
}

func scanSiteDomainMapping(row pgx.Row) (*domain.SiteDomainMapping, error) {
	var item domain.SiteDomainMapping
	err := row.Scan(
		&item.ID,
		&item.RegistrableDomain,
		&item.SiteKey,
		&item.SiteName,
		&item.IsActive,
		&item.CreatedAt,
		&item.UpdatedAt,
	)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, ErrSiteDomainMappingNotFound
		}
		return nil, err
	}
	return &item, nil
}

func (r *SiteDomainMappingRepository) List(ctx context.Context, f SiteDomainMappingFilter) ([]domain.SiteDomainMapping, int64, error) {
	args := []any{}
	where := "1=1"

	if f.Keyword != "" {
		args = append(args, "%"+f.Keyword+"%")
		where += fmt.Sprintf(" AND (registrable_domain ILIKE $%d OR site_key ILIKE $%d OR site_name ILIKE $%d)",
			len(args), len(args), len(args))
	}
	if f.IsActive != nil {
		args = append(args, *f.IsActive)
		where += fmt.Sprintf(" AND is_active = $%d", len(args))
	}

	var total int64
	if err := r.pool.QueryRow(ctx, "SELECT COUNT(*) FROM site_domain_mappings WHERE "+where, args...).Scan(&total); err != nil {
		return nil, 0, err
	}

	limit := f.Limit
	if limit <= 0 || limit > 200 {
		limit = 20
	}
	offset := f.Offset
	if offset < 0 {
		offset = 0
	}
	args = append(args, limit, offset)
	limitArg := len(args) - 1
	offsetArg := len(args)

	rows, err := r.pool.Query(ctx, fmt.Sprintf(`
		SELECT %s
		FROM site_domain_mappings
		WHERE %s
		ORDER BY is_active DESC, registrable_domain ASC, id DESC
		LIMIT $%d OFFSET $%d`, siteDomainMappingColumns, where, limitArg, offsetArg), args...)
	if err != nil {
		return nil, 0, err
	}
	defer rows.Close()

	items := make([]domain.SiteDomainMapping, 0, limit)
	for rows.Next() {
		item, scanErr := scanSiteDomainMapping(rows)
		if scanErr != nil {
			return nil, 0, scanErr
		}
		items = append(items, *item)
	}
	return items, total, rows.Err()
}

func (r *SiteDomainMappingRepository) GetByID(ctx context.Context, id int64) (*domain.SiteDomainMapping, error) {
	return scanSiteDomainMapping(r.pool.QueryRow(ctx, `
		SELECT `+siteDomainMappingColumns+`
		FROM site_domain_mappings
		WHERE id = $1`, id))
}

func (r *SiteDomainMappingRepository) Create(ctx context.Context, in CreateSiteDomainMappingInput) (*domain.SiteDomainMapping, error) {
	return scanSiteDomainMapping(r.pool.QueryRow(ctx, `
		INSERT INTO site_domain_mappings (registrable_domain, site_key, site_name, is_active)
		VALUES ($1, $2, $3, $4)
		RETURNING `+siteDomainMappingColumns,
		in.RegistrableDomain, in.SiteKey, in.SiteName, in.IsActive))
}

func (r *SiteDomainMappingRepository) Update(ctx context.Context, id int64, in UpdateSiteDomainMappingInput) (*domain.SiteDomainMapping, error) {
	return scanSiteDomainMapping(r.pool.QueryRow(ctx, `
		UPDATE site_domain_mappings
		SET registrable_domain = $1,
			site_key = $2,
			site_name = $3,
			is_active = $4,
			updated_at = NOW()
		WHERE id = $5
		RETURNING `+siteDomainMappingColumns,
		in.RegistrableDomain, in.SiteKey, in.SiteName, in.IsActive, id))
}

func (r *SiteDomainMappingRepository) SetActive(ctx context.Context, id int64, active bool) (*domain.SiteDomainMapping, error) {
	return scanSiteDomainMapping(r.pool.QueryRow(ctx, `
		UPDATE site_domain_mappings
		SET is_active = $1,
			updated_at = NOW()
		WHERE id = $2
		RETURNING `+siteDomainMappingColumns, active, id))
}

func (r *SiteDomainMappingRepository) Delete(ctx context.Context, id int64) error {
	cmd, err := r.pool.Exec(ctx, `DELETE FROM site_domain_mappings WHERE id = $1`, id)
	if err != nil {
		return err
	}
	if cmd.RowsAffected() == 0 {
		return ErrSiteDomainMappingNotFound
	}
	return nil
}