package persistence

// TrustlogStatus 存证状态枚举
type TrustlogStatus string

const (
	// StatusNotTrustlogged 未存证
	StatusNotTrustlogged TrustlogStatus = "NOT_TRUSTLOGGED"
	// StatusTrustlogged 已存证
	StatusTrustlogged TrustlogStatus = "TRUSTLOGGED"
)

// RetryStatus 重试状态枚举
type RetryStatus string

const (
	// RetryStatusPending 待重试
	RetryStatusPending RetryStatus = "PENDING"
	// RetryStatusRetrying 重试中
	RetryStatusRetrying RetryStatus = "RETRYING"
	// RetryStatusDeadLetter 死信（超过最大重试次数）
	RetryStatusDeadLetter RetryStatus = "DEAD_LETTER"
)

// SQL DDL 语句 - 使用通用 SQL 标准，避免方言

// OperationTableDDL 操作记录表的 DDL（通用 SQL）
const OperationTableDDL = `
CREATE TABLE IF NOT EXISTS operation (
    op_id              VARCHAR(32) NOT NULL PRIMARY KEY,
    op_actor           VARCHAR(64),
    doid               VARCHAR(512),
    producer_id        VARCHAR(32),
    request_body_hash  VARCHAR(128),
    response_body_hash VARCHAR(128),
    sign               VARCHAR(512),
    op_source          VARCHAR(10),
    op_code            INTEGER,
    do_prefix          VARCHAR(128),
    do_repository      VARCHAR(64),
    client_ip          VARCHAR(32),
    server_ip          VARCHAR(32),
    trustlog_status    VARCHAR(32),
    timestamp          TIMESTAMP,
    created_at         TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_operation_timestamp ON operation(timestamp);
CREATE INDEX IF NOT EXISTS idx_operation_status ON operation(trustlog_status);
CREATE INDEX IF NOT EXISTS idx_operation_doid ON operation(doid);
`

// CursorTableDDL 游标表的 DDL（用于跟踪已处理的操作）
const CursorTableDDL = `
CREATE TABLE IF NOT EXISTS trustlog_cursor (
    cursor_key       VARCHAR(64) NOT NULL PRIMARY KEY,
    cursor_value     VARCHAR(128) NOT NULL,
    last_updated_at  TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_cursor_updated_at ON trustlog_cursor(last_updated_at);
`

// RetryTableDDL 重试表的 DDL
const RetryTableDDL = `
CREATE TABLE IF NOT EXISTS trustlog_retry (
    op_id              VARCHAR(32) NOT NULL PRIMARY KEY,
    retry_count        INTEGER DEFAULT 0,
    retry_status       VARCHAR(32) DEFAULT 'PENDING',
    last_retry_at      TIMESTAMP,
    next_retry_at      TIMESTAMP,
    error_message      TEXT,
    created_at         TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at         TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_retry_status ON trustlog_retry(retry_status);
CREATE INDEX IF NOT EXISTS idx_retry_next_retry_at ON trustlog_retry(next_retry_at);
`

// GetDialectDDL 根据数据库类型返回适配的 DDL
// 这个函数处理不同数据库的差异，但尽量使用通用 SQL
func GetDialectDDL(driverName string) (string, string, string, error) {
	switch driverName {
	case "postgres":
		return getPostgresDDL(), getCursorDDLPostgres(), getRetryDDLPostgres(), nil
	case "mysql":
		return getMySQLDDL(), getCursorDDLMySQL(), getRetryDDLMySQL(), nil
	case "sqlite3", "sqlite":
		return getSQLiteDDL(), getCursorDDLSQLite(), getRetryDDLSQLite(), nil
	default:
		// 默认使用通用 SQL
		return OperationTableDDL, CursorTableDDL, RetryTableDDL, nil
	}
}

// PostgreSQL 特定 DDL
func getPostgresDDL() string {
	return `
CREATE TABLE IF NOT EXISTS operation (
    op_id              VARCHAR(32) NOT NULL PRIMARY KEY,
    op_actor           VARCHAR(64),
    doid               VARCHAR(512),
    producer_id        VARCHAR(32),
    request_body_hash  VARCHAR(128),
    response_body_hash VARCHAR(128),
    sign               VARCHAR(512),
    op_source          VARCHAR(10),
    op_code            INTEGER,
    do_prefix          VARCHAR(128),
    do_repository      VARCHAR(64),
    client_ip          VARCHAR(32),
    server_ip          VARCHAR(32),
    trustlog_status    VARCHAR(32),
    timestamp          TIMESTAMP,
    created_at         TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_operation_timestamp ON operation(timestamp);
CREATE INDEX IF NOT EXISTS idx_operation_status ON operation(trustlog_status);
CREATE INDEX IF NOT EXISTS idx_operation_doid ON operation(doid);
`
}

func getCursorDDLPostgres() string {
	return `
CREATE TABLE IF NOT EXISTS trustlog_cursor (
    cursor_key       VARCHAR(64) NOT NULL PRIMARY KEY,
    cursor_value     VARCHAR(128) NOT NULL,
    last_updated_at  TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_cursor_updated_at ON trustlog_cursor(last_updated_at);
`
}

func getRetryDDLPostgres() string {
	return `
CREATE TABLE IF NOT EXISTS trustlog_retry (
    op_id              VARCHAR(32) NOT NULL PRIMARY KEY,
    retry_count        INTEGER DEFAULT 0,
    retry_status       VARCHAR(32) DEFAULT 'PENDING',
    last_retry_at      TIMESTAMP,
    next_retry_at      TIMESTAMP,
    error_message      TEXT,
    created_at         TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at         TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_retry_status ON trustlog_retry(retry_status);
CREATE INDEX IF NOT EXISTS idx_retry_next_retry_at ON trustlog_retry(next_retry_at);
`
}

// MySQL 特定 DDL
func getMySQLDDL() string {
	return `
CREATE TABLE IF NOT EXISTS operation (
    op_id              VARCHAR(32) NOT NULL PRIMARY KEY,
    op_actor           VARCHAR(64),
    doid               VARCHAR(512),
    producer_id        VARCHAR(32),
    request_body_hash  VARCHAR(128),
    response_body_hash VARCHAR(128),
    sign               VARCHAR(512),
    op_source          VARCHAR(10),
    op_code            INT,
    do_prefix          VARCHAR(128),
    do_repository      VARCHAR(64),
    client_ip          VARCHAR(32),
    server_ip          VARCHAR(32),
    trustlog_status    VARCHAR(32),
    timestamp          DATETIME,
    created_at         DATETIME DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_operation_timestamp (timestamp),
    INDEX idx_operation_status (trustlog_status),
    INDEX idx_operation_doid (doid(255))
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
`
}

func getCursorDDLMySQL() string {
	return `
CREATE TABLE IF NOT EXISTS trustlog_cursor (
    cursor_key       VARCHAR(64) NOT NULL PRIMARY KEY,
    cursor_value     VARCHAR(128) NOT NULL,
    last_updated_at  DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    INDEX idx_cursor_updated_at (last_updated_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
`
}

func getRetryDDLMySQL() string {
	return `
CREATE TABLE IF NOT EXISTS trustlog_retry (
    op_id              VARCHAR(32) NOT NULL PRIMARY KEY,
    retry_count        INT DEFAULT 0,
    retry_status       VARCHAR(32) DEFAULT 'PENDING',
    last_retry_at      DATETIME,
    next_retry_at      DATETIME,
    error_message      TEXT,
    created_at         DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at         DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    INDEX idx_retry_status (retry_status),
    INDEX idx_retry_next_retry_at (next_retry_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
`
}

// SQLite 特定 DDL
func getSQLiteDDL() string {
	return `
CREATE TABLE IF NOT EXISTS operation (
    op_id              TEXT NOT NULL PRIMARY KEY,
    op_actor           TEXT,
    doid               TEXT,
    producer_id        TEXT,
    request_body_hash  TEXT,
    response_body_hash TEXT,
    sign               TEXT,
    op_source          TEXT,
    op_code            INTEGER,
    do_prefix          TEXT,
    do_repository      TEXT,
    client_ip          TEXT,
    server_ip          TEXT,
    trustlog_status    TEXT,
    timestamp          DATETIME,
    created_at         DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_operation_timestamp ON operation(timestamp);
CREATE INDEX IF NOT EXISTS idx_operation_status ON operation(trustlog_status);
CREATE INDEX IF NOT EXISTS idx_operation_doid ON operation(doid);
`
}

func getCursorDDLSQLite() string {
	return `
CREATE TABLE IF NOT EXISTS trustlog_cursor (
    cursor_key       TEXT NOT NULL PRIMARY KEY,
    cursor_value     TEXT NOT NULL,
    last_updated_at  TEXT DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_cursor_updated_at ON trustlog_cursor(last_updated_at);
`
}

func getRetryDDLSQLite() string {
	return `
CREATE TABLE IF NOT EXISTS trustlog_retry (
    op_id              TEXT NOT NULL PRIMARY KEY,
    retry_count        INTEGER DEFAULT 0,
    retry_status       TEXT DEFAULT 'PENDING',
    last_retry_at      DATETIME,
    next_retry_at      DATETIME,
    error_message      TEXT,
    created_at         DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at         DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_retry_status ON trustlog_retry(retry_status);
CREATE INDEX IF NOT EXISTS idx_retry_next_retry_at ON trustlog_retry(next_retry_at);
`
}