sqltool 0.4.1

use crate::models::Field;
use anyhow::Result;

/// 数据库版本信息
#[derive(Debug, Clone)]
pub struct DatabaseVersion {
    pub major: u32,
    pub minor: u32,
    pub patch: u32,
}

impl DatabaseVersion {
    pub fn new(major: u32, minor: u32, patch: u32) -> Self {
        Self { major, minor, patch }
    }

    /// 解析版本字符串
    pub fn parse(version_str: &str) -> Result<Self> {
        let parts: Vec<&str> = version_str.split('.').collect();
        if parts.len() < 1 {
            return Err(anyhow::anyhow!("Invalid version string: {}", version_str));
        }

        let major = parts[0].parse()?;
        let minor = if parts.len() > 1 { parts[1].parse()? } else { 0 };
        let patch = if parts.len() > 2 { parts[2].parse()? } else { 0 };

        Ok(Self::new(major, minor, patch))
    }

    /// 比较版本
    pub fn compare(&self, other: &Self) -> std::cmp::Ordering {
        if self.major != other.major {
            self.major.cmp(&other.major)
        } else if self.minor != other.minor {
            self.minor.cmp(&other.minor)
        } else {
            self.patch.cmp(&other.patch)
        }
    }

    /// 是否大于等于另一个版本
    pub fn is_gte(&self, other: &Self) -> bool {
        self.compare(other) != std::cmp::Ordering::Less
    }

    /// 是否小于另一个版本
    pub fn is_lt(&self, other: &Self) -> bool {
        self.compare(other) == std::cmp::Ordering::Less
    }
}

/// 数据库兼容性处理
pub trait DatabaseCompatibility {
    /// 获取数据库版本
    fn get_version(&self) -> Result<DatabaseVersion>;

    /// 转换字段类型以兼容目标数据库版本
    fn convert_field_type(&self, field: &Field, target_version: &DatabaseVersion) -> Result<Field>;

    /// 生成兼容的SQL语句
    fn generate_compatible_sql(&self, sql: &str, target_version: &DatabaseVersion) -> Result<String>;
}

/// MySQL兼容性处理
pub struct MySqlCompatibility;

impl DatabaseCompatibility for MySqlCompatibility {
    fn get_version(&self) -> Result<DatabaseVersion> {
        // 实现获取MySQL版本的逻辑
        todo!()
    }

    fn convert_field_type(&self, field: &Field, _target_version: &DatabaseVersion) -> Result<Field> {
        // 处理MySQL版本之间的字段类型差异
        // 例如：在MySQL 8.0中，某些字段类型可能有变化
        Ok(field.clone())
    }

    fn generate_compatible_sql(&self, sql: &str, _target_version: &DatabaseVersion) -> Result<String> {
        // 处理MySQL版本之间的SQL语法差异
        Ok(sql.to_string())
    }
}

/// PostgreSQL兼容性处理
pub struct PostgresCompatibility;

impl DatabaseCompatibility for PostgresCompatibility {
    fn get_version(&self) -> Result<DatabaseVersion> {
        // 实现获取PostgreSQL版本的逻辑
        todo!()
    }

    fn convert_field_type(&self, field: &Field, _target_version: &DatabaseVersion) -> Result<Field> {
        // 处理PostgreSQL版本之间的字段类型差异
        Ok(field.clone())
    }

    fn generate_compatible_sql(&self, sql: &str, _target_version: &DatabaseVersion) -> Result<String> {
        // 处理PostgreSQL版本之间的SQL语法差异
        Ok(sql.to_string())
    }
}

/// SQLite兼容性处理
pub struct SqliteCompatibility;

impl DatabaseCompatibility for SqliteCompatibility {
    fn get_version(&self) -> Result<DatabaseVersion> {
        // 实现获取SQLite版本的逻辑
        todo!()
    }

    fn convert_field_type(&self, field: &Field, _target_version: &DatabaseVersion) -> Result<Field> {
        // 处理SQLite版本之间的字段类型差异
        Ok(field.clone())
    }

    fn generate_compatible_sql(&self, sql: &str, _target_version: &DatabaseVersion) -> Result<String> {
        // 处理SQLite版本之间的SQL语法差异
        Ok(sql.to_string())
    }
}