package mysql

import (
	"database/sql"
	"fmt"
	"os"
	"strings"
	"sync"
	"testing"
	"time"

	"github.com/hashicorp/vault/builtin/logical/database/dbplugin"
	"github.com/hashicorp/vault/plugins/helper/database/connutil"
	dockertest "gopkg.in/ory-am/dockertest.v3"
)

var (
	testMySQLImagePull sync.Once
)

func prepareMySQLTestContainer(t *testing.T) (cleanup func(), retURL string) {
	if os.Getenv("MYSQL_URL") != "" {
		return func() {}, os.Getenv("MYSQL_URL")
	}

	pool, err := dockertest.NewPool("")
	if err != nil {
		t.Fatalf("Failed to connect to docker: %s", err)
	}

	resource, err := pool.Run("mysql", "latest", []string{"MYSQL_ROOT_PASSWORD=secret"})
	if err != nil {
		t.Fatalf("Could not start local MySQL docker container: %s", err)
	}

	cleanup = func() {
		err := pool.Purge(resource)
		if err != nil {
			t.Fatalf("Failed to cleanup local container: %s", err)
		}
	}

	retURL = fmt.Sprintf("root:secret@(localhost:%s)/mysql?parseTime=true", resource.GetPort("3306/tcp"))

	// exponential backoff-retry
	if err = pool.Retry(func() error {
		var err error
		var db *sql.DB
		db, err = sql.Open("mysql", retURL)
		if err != nil {
			return err
		}
		return db.Ping()
	}); err != nil {
		t.Fatalf("Could not connect to MySQL docker container: %s", err)
	}

	return
}

func TestMySQL_Initialize(t *testing.T) {
	cleanup, connURL := prepareMySQLTestContainer(t)
	defer cleanup()

	connectionDetails := map[string]interface{}{
		"connection_url": connURL,
	}

	f := New(MetadataLen, UsernameLen)
	dbRaw, _ := f()
	db := dbRaw.(*MySQL)
	connProducer := db.ConnectionProducer.(*connutil.SQLConnectionProducer)

	err := db.Initialize(connectionDetails, true)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if !connProducer.Initialized {
		t.Fatal("Database should be initalized")
	}

	err = db.Close()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Test decoding a string value for max_open_connections
	connectionDetails = map[string]interface{}{
		"connection_url":       connURL,
		"max_open_connections": "5",
	}

	err = db.Initialize(connectionDetails, true)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
}

func TestMySQL_CreateUser(t *testing.T) {
	cleanup, connURL := prepareMySQLTestContainer(t)
	defer cleanup()

	connectionDetails := map[string]interface{}{
		"connection_url": connURL,
	}

	f := New(MetadataLen, UsernameLen)
	dbRaw, _ := f()
	db := dbRaw.(*MySQL)

	err := db.Initialize(connectionDetails, true)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	usernameConfig := dbplugin.UsernameConfig{
		DisplayName: "test",
		RoleName:    "test",
	}

	// Test with no configured Creation Statememt
	_, _, err = db.CreateUser(dbplugin.Statements{}, usernameConfig, time.Now().Add(time.Minute))
	if err == nil {
		t.Fatal("Expected error when no creation statement is provided")
	}

	statements := dbplugin.Statements{
		CreationStatements: testMySQLRoleWildCard,
	}

	username, password, err := db.CreateUser(statements, usernameConfig, time.Now().Add(time.Minute))
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if err := testCredsExist(t, connURL, username, password); err != nil {
		t.Fatalf("Could not connect with new credentials: %s", err)
	}
}

func TestMySQL_RevokeUser(t *testing.T) {
	cleanup, connURL := prepareMySQLTestContainer(t)
	defer cleanup()

	connectionDetails := map[string]interface{}{
		"connection_url": connURL,
	}

	f := New(MetadataLen, UsernameLen)
	dbRaw, _ := f()
	db := dbRaw.(*MySQL)

	err := db.Initialize(connectionDetails, true)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	statements := dbplugin.Statements{
		CreationStatements: testMySQLRoleWildCard,
	}

	usernameConfig := dbplugin.UsernameConfig{
		DisplayName: "test",
		RoleName:    "test",
	}

	username, password, err := db.CreateUser(statements, usernameConfig, time.Now().Add(time.Minute))
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if err := testCredsExist(t, connURL, username, password); err != nil {
		t.Fatalf("Could not connect with new credentials: %s", err)
	}

	// Test default revoke statememts
	err = db.RevokeUser(statements, username)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if err := testCredsExist(t, connURL, username, password); err == nil {
		t.Fatal("Credentials were not revoked")
	}

	statements.CreationStatements = testMySQLRoleWildCard
	username, password, err = db.CreateUser(statements, usernameConfig, time.Now().Add(time.Minute))
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if err := testCredsExist(t, connURL, username, password); err != nil {
		t.Fatalf("Could not connect with new credentials: %s", err)
	}

	// Test custom revoke statements
	statements.RevocationStatements = testMySQLRevocationSQL
	err = db.RevokeUser(statements, username)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if err := testCredsExist(t, connURL, username, password); err == nil {
		t.Fatal("Credentials were not revoked")
	}
}

func testCredsExist(t testing.TB, connURL, username, password string) error {
	// Log in with the new creds
	connURL = strings.Replace(connURL, "root:secret", fmt.Sprintf("%s:%s", username, password), 1)
	db, err := sql.Open("mysql", connURL)
	if err != nil {
		return err
	}
	defer db.Close()
	return db.Ping()
}

const testMySQLRoleWildCard = `
CREATE USER '{{name}}'@'%' IDENTIFIED BY '{{password}}';
GRANT SELECT ON *.* TO '{{name}}'@'%';
`
const testMySQLRevocationSQL = `
REVOKE ALL PRIVILEGES, GRANT OPTION FROM '{{name}}'@'%'; 
DROP USER '{{name}}'@'%';
`