package mysql

import (
	"database/sql"
	"fmt"
	"os"
	"time"

	"git.hexq.cn/tiglog/mydb"
	"git.hexq.cn/tiglog/mydb/internal/sqladapter"
	"git.hexq.cn/tiglog/mydb/internal/testsuite"
)

var settings = ConnectionURL{
	Database: os.Getenv("DB_NAME"),
	User:     os.Getenv("DB_USERNAME"),
	Password: os.Getenv("DB_PASSWORD"),
	Host:     os.Getenv("DB_HOST") + ":" + os.Getenv("DB_PORT"),
	Options: map[string]string{
		// See https://github.com/go-sql-driver/mysql/issues/9
		"parseTime": "true",
		// Might require you to use mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql
		"time_zone": fmt.Sprintf(`'%s'`, testsuite.TimeZone),
		"loc":       testsuite.TimeZone,
	},
}

type Helper struct {
	sess mydb.Session
}

func cleanUp(sess mydb.Session) error {
	if activeStatements := sqladapter.NumActiveStatements(); activeStatements > 128 {
		return fmt.Errorf("Expecting active statements to be at most 128, got %d", activeStatements)
	}

	sess.Reset()

	if activeStatements := sqladapter.NumActiveStatements(); activeStatements != 0 {
		return fmt.Errorf("Expecting active statements to be 0, got %d", activeStatements)
	}

	var err error
	var stats map[string]int
	for i := 0; i < 10; i++ {
		stats, err = getStats(sess)
		if err != nil {
			return err
		}

		if stats["Prepared_stmt_count"] != 0 {
			time.Sleep(time.Millisecond * 200) // Sometimes it takes a bit to clean prepared statements
			err = fmt.Errorf(`Expecting "Prepared_stmt_count" to be 0, got %d`, stats["Prepared_stmt_count"])
			continue
		}
		break
	}

	return err
}

func getStats(sess mydb.Session) (map[string]int, error) {
	stats := make(map[string]int)

	res, err := sess.Driver().(*sql.DB).Query(`SHOW GLOBAL STATUS LIKE '%stmt%'`)
	if err != nil {
		return nil, err
	}
	var result struct {
		VariableName string `db:"Variable_name"`
		Value        int    `db:"Value"`
	}

	iter := sess.SQL().NewIterator(res)
	for iter.Next(&result) {
		stats[result.VariableName] = result.Value
	}

	return stats, nil
}

func (h *Helper) Session() mydb.Session {
	return h.sess
}

func (h *Helper) Adapter() string {
	return "mysql"
}

func (h *Helper) TearDown() error {
	if err := cleanUp(h.sess); err != nil {
		return err
	}

	return h.sess.Close()
}

func (h *Helper) TearUp() error {
	var err error

	h.sess, err = Open(settings)
	if err != nil {
		return err
	}

	batch := []string{
		`DROP TABLE IF EXISTS artist`,
		`CREATE TABLE artist (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			PRIMARY KEY(id),
			name VARCHAR(60)
		)`,

		`DROP TABLE IF EXISTS publication`,
		`CREATE TABLE publication (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			PRIMARY KEY(id),
			title VARCHAR(80),
			author_id BIGINT(20)
		)`,

		`DROP TABLE IF EXISTS review`,
		`CREATE TABLE review (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			PRIMARY KEY(id),
			publication_id BIGINT(20),
			name VARCHAR(80),
			comments TEXT,
			created DATETIME NOT NULL
		)`,

		`DROP TABLE IF EXISTS data_types`,
		`CREATE TABLE data_types (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			PRIMARY KEY(id),
			_uint INT(10) UNSIGNED DEFAULT 0,
			_uint8 INT(10) UNSIGNED DEFAULT 0,
			_uint16 INT(10) UNSIGNED DEFAULT 0,
			_uint32 INT(10) UNSIGNED DEFAULT 0,
			_uint64 INT(10) UNSIGNED DEFAULT 0,
			_int INT(10) DEFAULT 0,
			_int8 INT(10) DEFAULT 0,
			_int16 INT(10) DEFAULT 0,
			_int32 INT(10) DEFAULT 0,
			_int64 INT(10) DEFAULT 0,
			_float32 DECIMAL(10,6),
			_float64 DECIMAL(10,6),
			_bool TINYINT(1),
			_string text,
			_blob blob,
			_date TIMESTAMP NULL,
			_nildate DATETIME NULL,
			_ptrdate DATETIME NULL,
			_defaultdate TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
			_time BIGINT UNSIGNED NOT NULL DEFAULT 0
		)`,

		`DROP TABLE IF EXISTS stats_test`,
		`CREATE TABLE stats_test (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY(id),
			` + "`numeric`" + ` INT(10),
			` + "`value`" + ` INT(10)
		)`,

		`DROP TABLE IF EXISTS composite_keys`,
		`CREATE TABLE composite_keys (
			code VARCHAR(255) default '',
			user_id VARCHAR(255) default '',
			some_val VARCHAR(255) default '',
			primary key (code, user_id)
		)`,

		`DROP TABLE IF EXISTS admin`,
		`CREATE TABLE admin (
			ID int(11) NOT NULL AUTO_INCREMENT,
			Accounts varchar(255) DEFAULT '',
			LoginPassWord varchar(255) DEFAULT '',
			Date TIMESTAMP(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
			PRIMARY KEY (ID,Date)
		) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8`,

		`DROP TABLE IF EXISTS my_types`,

		`CREATE TABLE my_types (id int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY(id)
			, json_map JSON
			, json_map_ptr JSON

			, auto_json_map JSON
			, auto_json_map_string JSON
			, auto_json_map_integer JSON

			, json_object JSON
			, json_array JSON

			, custom_json_object JSON
			, auto_custom_json_object JSON

			, custom_json_object_ptr JSON
			, auto_custom_json_object_ptr JSON

			, custom_json_object_array JSON
			, auto_custom_json_object_array JSON
			, auto_custom_json_object_map JSON

			, integer_compat_value_json_array JSON
			, string_compat_value_json_array JSON
			, uinteger_compat_value_json_array JSON

		)`,

		`DROP TABLE IF EXISTS ` + "`" + `birthdays` + "`" + ``,
		`CREATE TABLE ` + "`" + `birthdays` + "`" + ` (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY(id),
			name VARCHAR(50),
			born DATE,
			born_ut BIGINT(20) SIGNED
		) CHARSET=utf8`,

		`DROP TABLE IF EXISTS ` + "`" + `fibonacci` + "`" + ``,
		`CREATE TABLE ` + "`" + `fibonacci` + "`" + ` (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY(id),
			input BIGINT(20) UNSIGNED NOT NULL,
			output BIGINT(20) UNSIGNED NOT NULL
		) CHARSET=utf8`,

		`DROP TABLE IF EXISTS ` + "`" + `is_even` + "`" + ``,
		`CREATE TABLE ` + "`" + `is_even` + "`" + ` (
			input BIGINT(20) UNSIGNED NOT NULL,
			is_even TINYINT(1)
		) CHARSET=utf8`,

		`DROP TABLE IF EXISTS ` + "`" + `CaSe_TesT` + "`" + ``,
		`CREATE TABLE ` + "`" + `CaSe_TesT` + "`" + ` (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY(id),
			case_test VARCHAR(60)
		) CHARSET=utf8`,

		`DROP TABLE IF EXISTS accounts`,

		`CREATE TABLE accounts (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			PRIMARY KEY(id),
			name varchar(255),
			disabled BOOL,
			created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
		)`,

		`DROP TABLE IF EXISTS users`,

		`CREATE TABLE users (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			PRIMARY KEY(id),
			account_id BIGINT(20),
			username varchar(255) UNIQUE
		)`,

		`DROP TABLE IF EXISTS logs`,

		`CREATE TABLE logs (
			id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			PRIMARY KEY(id),
			message VARCHAR(255)
		)`,
	}

	for _, query := range batch {
		driver := h.sess.Driver().(*sql.DB)
		if _, err := driver.Exec(query); err != nil {
			return err
		}
	}

	return nil
}

var _ testsuite.Helper = &Helper{}