package mysql

import (
	"context"
	"database/sql"
	"fmt"
	"log"
	"os"
	"reflect"
	"testing"

	"github.com/hashicorp/vault/logical"
	logicaltest "github.com/hashicorp/vault/logical/testing"
	"github.com/mitchellh/mapstructure"
	"github.com/ory/dockertest"
)

func prepareTestContainer(t *testing.T) (func(), 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", "5.7", []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
		}
		defer db.Close()
		return db.Ping()
	}); err != nil {
		cleanup()
		t.Fatalf("Could not connect to MySQL docker container: %s", err)
	}

	return cleanup, retURL
}

func TestBackend_config_connection(t *testing.T) {
	var resp *logical.Response
	var err error
	config := logical.TestBackendConfig()
	config.StorageView = &logical.InmemStorage{}
	b, err := Factory(context.Background(), config)
	if err != nil {
		t.Fatal(err)
	}

	configData := map[string]interface{}{
		"connection_url":       "sample_connection_url",
		"max_open_connections": 9,
		"max_idle_connections": 7,
		"verify_connection":    false,
	}

	configReq := &logical.Request{
		Operation: logical.UpdateOperation,
		Path:      "config/connection",
		Storage:   config.StorageView,
		Data:      configData,
	}
	resp, err = b.HandleRequest(context.Background(), configReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%s resp:%#v\n", err, resp)
	}

	configReq.Operation = logical.ReadOperation
	resp, err = b.HandleRequest(context.Background(), configReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%s resp:%#v\n", err, resp)
	}

	delete(configData, "verify_connection")
	delete(configData, "connection_url")
	if !reflect.DeepEqual(configData, resp.Data) {
		t.Fatalf("bad: expected:%#v\nactual:%#v\n", configData, resp.Data)
	}
}

func TestBackend_basic(t *testing.T) {
	config := logical.TestBackendConfig()
	config.StorageView = &logical.InmemStorage{}
	b, err := Factory(context.Background(), config)
	if err != nil {
		t.Fatal(err)
	}

	cleanup, connURL := prepareTestContainer(t)
	defer cleanup()

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

	// for wildcard based mysql user
	logicaltest.Test(t, logicaltest.TestCase{
		Backend: b,
		Steps: []logicaltest.TestStep{
			testAccStepConfig(t, connData, false),
			testAccStepRole(t, true),
			testAccStepReadCreds(t, "web"),
		},
	})
}

func TestBackend_basicHostRevoke(t *testing.T) {
	config := logical.TestBackendConfig()
	config.StorageView = &logical.InmemStorage{}
	b, err := Factory(context.Background(), config)
	if err != nil {
		t.Fatal(err)
	}

	cleanup, connURL := prepareTestContainer(t)
	defer cleanup()

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

	// for host based mysql user
	logicaltest.Test(t, logicaltest.TestCase{
		Backend: b,
		Steps: []logicaltest.TestStep{
			testAccStepConfig(t, connData, false),
			testAccStepRole(t, false),
			testAccStepReadCreds(t, "web"),
		},
	})
}

func TestBackend_roleCrud(t *testing.T) {
	config := logical.TestBackendConfig()
	config.StorageView = &logical.InmemStorage{}
	b, err := Factory(context.Background(), config)
	if err != nil {
		t.Fatal(err)
	}

	cleanup, connURL := prepareTestContainer(t)
	defer cleanup()

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

	logicaltest.Test(t, logicaltest.TestCase{
		Backend: b,
		Steps: []logicaltest.TestStep{
			testAccStepConfig(t, connData, false),
			// test SQL with wildcard based user
			testAccStepRole(t, true),
			testAccStepReadRole(t, "web", testRoleWildCard),
			testAccStepDeleteRole(t, "web"),
			// test SQL with host  based user
			testAccStepRole(t, false),
			testAccStepReadRole(t, "web", testRoleHost),
			testAccStepDeleteRole(t, "web"),
		},
	})
}

func TestBackend_leaseWriteRead(t *testing.T) {
	config := logical.TestBackendConfig()
	config.StorageView = &logical.InmemStorage{}
	b, err := Factory(context.Background(), config)
	if err != nil {
		t.Fatal(err)
	}

	cleanup, connURL := prepareTestContainer(t)
	defer cleanup()

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

	logicaltest.Test(t, logicaltest.TestCase{
		Backend: b,
		Steps: []logicaltest.TestStep{
			testAccStepConfig(t, connData, false),
			testAccStepWriteLease(t),
			testAccStepReadLease(t),
		},
	})

}

func testAccStepConfig(t *testing.T, d map[string]interface{}, expectError bool) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "config/connection",
		Data:      d,
		ErrorOk:   true,
		Check: func(resp *logical.Response) error {
			if expectError {
				if resp.Data == nil {
					return fmt.Errorf("data is nil")
				}
				var e struct {
					Error string `mapstructure:"error"`
				}
				if err := mapstructure.Decode(resp.Data, &e); err != nil {
					return err
				}
				if len(e.Error) == 0 {
					return fmt.Errorf("expected error, but write succeeded")
				}
				return nil
			} else if resp != nil && resp.IsError() {
				return fmt.Errorf("got an error response: %v", resp.Error())
			}
			return nil
		},
	}
}

func testAccStepRole(t *testing.T, wildCard bool) logicaltest.TestStep {

	pathData := make(map[string]interface{})
	if wildCard == true {
		pathData = map[string]interface{}{
			"sql": testRoleWildCard,
		}
	} else {
		pathData = map[string]interface{}{
			"sql":            testRoleHost,
			"revocation_sql": testRevocationSQL,
		}
	}

	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "roles/web",
		Data:      pathData,
	}

}

func testAccStepDeleteRole(t *testing.T, n string) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.DeleteOperation,
		Path:      "roles/" + n,
	}
}

func testAccStepReadCreds(t *testing.T, name string) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.ReadOperation,
		Path:      "creds/" + name,
		Check: func(resp *logical.Response) error {
			var d struct {
				Username string `mapstructure:"username"`
				Password string `mapstructure:"password"`
			}
			if err := mapstructure.Decode(resp.Data, &d); err != nil {
				return err
			}
			log.Printf("[WARN] Generated credentials: %v", d)

			return nil
		},
	}
}

func testAccStepReadRole(t *testing.T, name string, sql string) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.ReadOperation,
		Path:      "roles/" + name,
		Check: func(resp *logical.Response) error {
			if resp == nil {
				if sql == "" {
					return nil
				}

				return fmt.Errorf("bad: %#v", resp)
			}

			var d struct {
				SQL string `mapstructure:"sql"`
			}
			if err := mapstructure.Decode(resp.Data, &d); err != nil {
				return err
			}

			if d.SQL != sql {
				return fmt.Errorf("bad: %#v", resp)
			}

			return nil
		},
	}
}

func testAccStepWriteLease(t *testing.T) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "config/lease",
		Data: map[string]interface{}{
			"lease":     "1h5m",
			"lease_max": "24h",
		},
	}
}

func testAccStepReadLease(t *testing.T) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.ReadOperation,
		Path:      "config/lease",
		Check: func(resp *logical.Response) error {
			if resp.Data["lease"] != "1h5m0s" || resp.Data["lease_max"] != "24h0m0s" {
				return fmt.Errorf("bad: %#v", resp)
			}

			return nil
		},
	}
}

const testRoleWildCard = `
CREATE USER '{{name}}'@'%' IDENTIFIED BY '{{password}}';
GRANT SELECT ON *.* TO '{{name}}'@'%';
`
const testRoleHost = `
CREATE USER '{{name}}'@'10.1.1.2' IDENTIFIED BY '{{password}}';
GRANT SELECT ON *.* TO '{{name}}'@'10.1.1.2';
`
const testRevocationSQL = `
REVOKE ALL PRIVILEGES, GRANT OPTION FROM '{{name}}'@'10.1.1.2'; 
DROP USER '{{name}}'@'10.1.1.2';
`