package db

import (
	"context"

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

func (db *DB) GetTenantBySubdomain(ctx context.Context, subdomain string) (*Tenant, error) {
	var t Tenant
	var ownerID, customDomain *string
	err := db.pool.QueryRow(ctx,
		`SELECT id, owner_id, subdomain, custom_domain, premium, members_enabled, donations_enabled, created_at
		 FROM tenants WHERE subdomain = $1`,
		subdomain).Scan(&t.ID, &ownerID, &t.Subdomain, &customDomain, &t.Premium,
		&t.MembersEnabled, &t.DonationsEnabled, &t.CreatedAt)
	if err == pgx.ErrNoRows {
		return nil, nil
	}
	if ownerID != nil {
		t.OwnerID = *ownerID
	}
	if customDomain != nil {
		t.CustomDomain = *customDomain
	}
	return &t, err
}

func (db *DB) GetTenantByOwner(ctx context.Context, ownerID string) (*Tenant, error) {
	var t Tenant
	var owner, customDomain *string
	err := db.pool.QueryRow(ctx,
		`SELECT id, owner_id, subdomain, custom_domain, premium, members_enabled, donations_enabled, created_at
		 FROM tenants WHERE owner_id = $1`,
		ownerID).Scan(&t.ID, &owner, &t.Subdomain, &customDomain, &t.Premium,
		&t.MembersEnabled, &t.DonationsEnabled, &t.CreatedAt)
	if err == pgx.ErrNoRows {
		return nil, nil
	}
	if owner != nil {
		t.OwnerID = *owner
	}
	if customDomain != nil {
		t.CustomDomain = *customDomain
	}
	return &t, err
}

func (db *DB) CreateTenant(ctx context.Context, ownerID, subdomain string) (*Tenant, error) {
	var t Tenant
	err := db.pool.QueryRow(ctx,
		`INSERT INTO tenants (owner_id, subdomain)
		 VALUES ($1, $2)
		 RETURNING id, owner_id, subdomain, custom_domain, premium, members_enabled, donations_enabled, created_at`,
		ownerID, subdomain).Scan(&t.ID, &t.OwnerID, &t.Subdomain, &t.CustomDomain, &t.Premium,
		&t.MembersEnabled, &t.DonationsEnabled, &t.CreatedAt)
	return &t, err
}

func (db *DB) GetTenantByID(ctx context.Context, id string) (*Tenant, error) {
	var t Tenant
	var ownerID, customDomain *string
	err := db.pool.QueryRow(ctx,
		`SELECT id, owner_id, subdomain, custom_domain, premium, members_enabled, donations_enabled, created_at
		 FROM tenants WHERE id = $1`,
		id).Scan(&t.ID, &ownerID, &t.Subdomain, &customDomain, &t.Premium,
		&t.MembersEnabled, &t.DonationsEnabled, &t.CreatedAt)
	if err == pgx.ErrNoRows {
		return nil, nil
	}
	if ownerID != nil {
		t.OwnerID = *ownerID
	}
	if customDomain != nil {
		t.CustomDomain = *customDomain
	}
	return &t, err
}

func (db *DB) IsUserTenantOwner(ctx context.Context, userID, tenantID string) (bool, error) {
	var exists bool
	err := db.pool.QueryRow(ctx,
		`SELECT EXISTS(SELECT 1 FROM tenants WHERE id = $1 AND owner_id = $2)`,
		tenantID, userID).Scan(&exists)
	return exists, err
}

func (db *DB) IsSubdomainAvailable(ctx context.Context, subdomain string) (bool, error) {
	var exists bool

	err := db.pool.QueryRow(ctx,
		`SELECT EXISTS(SELECT 1 FROM reserved_subdomains WHERE subdomain = $1)`,
		subdomain).Scan(&exists)
	if err != nil {
		return false, err
	}
	if exists {
		return false, nil
	}

	err = db.pool.QueryRow(ctx,
		`SELECT EXISTS(SELECT 1 FROM demos WHERE subdomain = $1 AND expires_at > NOW())`,
		subdomain).Scan(&exists)
	if err != nil {
		return false, err
	}
	if exists {
		return false, nil
	}

	err = db.pool.QueryRow(ctx,
		`SELECT EXISTS(SELECT 1 FROM tenants WHERE subdomain = $1)`,
		subdomain).Scan(&exists)
	if err != nil {
		return false, err
	}

	return !exists, nil
}

func (db *DB) ListTenants(ctx context.Context) ([]Tenant, error) {
	rows, err := db.pool.Query(ctx,
		`SELECT id, owner_id, subdomain, custom_domain, premium, members_enabled, donations_enabled, created_at
		 FROM tenants`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var tenants []Tenant
	for rows.Next() {
		var t Tenant
		var ownerID, customDomain *string
		if err := rows.Scan(&t.ID, &ownerID, &t.Subdomain, &customDomain, &t.Premium,
			&t.MembersEnabled, &t.DonationsEnabled, &t.CreatedAt); err != nil {
			return nil, err
		}
		if ownerID != nil {
			t.OwnerID = *ownerID
		}
		if customDomain != nil {
			t.CustomDomain = *customDomain
		}
		tenants = append(tenants, t)
	}
	return tenants, rows.Err()
}