package service

import (
	"bufio"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"strings"
)

// SwaggerInfo Swagger注释信息
type SwaggerInfo struct {
	Summary     string
	Description string
	Tags        string
	Router      string
	Method      string
}

// SwaggerParser Swagger注释解析器
type SwaggerParser struct {
	swaggerMap map[string]SwaggerInfo
}

// NewSwaggerParser 创建Swagger解析器
func NewSwaggerParser() *SwaggerParser {
	parser := &SwaggerParser{
		swaggerMap: make(map[string]SwaggerInfo),
	}
	fmt.Println("🔧 SwaggerParser创建成功")
	return parser
}

// ParseControllerDirectory 解析Controller目录下的所有文件
func (sp *SwaggerParser) ParseControllerDirectory(dir string) error {
	fmt.Printf("🔍 开始解析Controller目录: %s\n", dir)

	fileCount := 0
	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			fmt.Printf("❌ 访问文件失败: %s, 错误: %v\n", path, err)
			return err
		}

		if !info.IsDir() && strings.HasSuffix(path, ".go") {
			fmt.Printf("📄 解析文件: %s\n", path)
			fileCount++
			return sp.parseControllerFile(path)
		}

		return nil
	})

	fmt.Printf("📊 解析完成，共处理 %d 个Go文件\n", fileCount)
	fmt.Printf("📋 解析到的Swagger信息数量: %d\n", len(sp.swaggerMap))

	return err
}

// parseControllerFile 解析单个Controller文件
func (sp *SwaggerParser) parseControllerFile(filePath string) error {
	file, err := os.Open(filePath)
	if err != nil {
		return err
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	var currentComment []string

	for scanner.Scan() {
		line := scanner.Text()

		// 检查是否是注释行
		if strings.HasPrefix(strings.TrimSpace(line), "//") {
			currentComment = append(currentComment, line)
		} else {
			// 如果不是注释行，处理之前收集的注释
			if len(currentComment) > 0 {
				swaggerInfo := sp.extractSwaggerInfo(currentComment)
				if swaggerInfo.Router != "" {
					// 使用Router路径作为key
					key := fmt.Sprintf("%s %s", swaggerInfo.Method, swaggerInfo.Router)
					sp.swaggerMap[key] = swaggerInfo
				}
				currentComment = nil
			}
		}
	}

	return scanner.Err()
}

// extractSwaggerInfo 从注释中提取Swagger信息
func (sp *SwaggerParser) extractSwaggerInfo(comments []string) SwaggerInfo {
	info := SwaggerInfo{}

	for _, comment := range comments {
		comment = strings.TrimSpace(comment)

		// 提取@Summary
		if strings.HasPrefix(comment, "// @Summary") {
			info.Summary = strings.TrimSpace(strings.TrimPrefix(comment, "// @Summary"))
		}

		// 提取@Description
		if strings.HasPrefix(comment, "// @Description") {
			info.Description = strings.TrimSpace(strings.TrimPrefix(comment, "// @Description"))
		}

		// 提取@Tags
		if strings.HasPrefix(comment, "// @Tags") {
			info.Tags = strings.TrimSpace(strings.TrimPrefix(comment, "// @Tags"))
		}

		// 提取@Router
		if strings.HasPrefix(comment, "// @Router") {
			routerLine := strings.TrimSpace(strings.TrimPrefix(comment, "// @Router"))
			// 解析格式：/path [method]
			parts := strings.Fields(routerLine)
			if len(parts) >= 2 {
				info.Router = parts[0]
				// 提取HTTP方法
				if len(parts) > 1 {
					methodPart := parts[1]
					if strings.HasPrefix(methodPart, "[") && strings.HasSuffix(methodPart, "]") {
						info.Method = strings.ToUpper(strings.Trim(methodPart, "[]"))
					}
				}
			}
		}
	}

	return info
}

// GetSummary 根据路径和方法获取Summary
func (sp *SwaggerParser) GetSummary(method, path string) string {
	// 尝试精确匹配
	key := fmt.Sprintf("%s %s", strings.ToUpper(method), path)
	if info, exists := sp.swaggerMap[key]; exists {
		return info.Summary
	}

	// 尝试匹配不带/api前缀的路径
	if strings.HasPrefix(path, "/api/") {
		pathWithoutAPI := strings.TrimPrefix(path, "/api")
		keyWithoutAPI := fmt.Sprintf("%s %s", strings.ToUpper(method), pathWithoutAPI)
		if info, exists := sp.swaggerMap[keyWithoutAPI]; exists {
			return info.Summary
		}
	}

	// 尝试模糊匹配（处理路径参数）
	for swaggerKey, info := range sp.swaggerMap {
		if sp.matchRoute(swaggerKey, fmt.Sprintf("%s %s", strings.ToUpper(method), path)) {
			return info.Summary
		}
	}

	// 尝试匹配转换后的路径（将:var转换为{var}）
	convertedPath := sp.convertPathFormat(path)
	if convertedPath != path {
		convertedKey := fmt.Sprintf("%s %s", strings.ToUpper(method), convertedPath)
		if info, exists := sp.swaggerMap[convertedKey]; exists {
			return info.Summary
		}
	}

	return ""
}

// convertPathFormat 转换路径格式：将:var格式改为{var}格式
func (sp *SwaggerParser) convertPathFormat(path string) string {
	re := regexp.MustCompile(`:([a-zA-Z0-9_]+)`)
	return re.ReplaceAllString(path, "{$1}")
}

// matchRoute 匹配路由（处理路径参数）
func (sp *SwaggerParser) matchRoute(pattern, route string) bool {
	// 将路径参数转换为正则表达式
	// 例如：/users/:id -> /users/[^/]+
	patternRegex := regexp.MustCompile(`:[a-zA-Z0-9_]+`)
	regexPattern := patternRegex.ReplaceAllString(pattern, `[^/]+`)

	// 创建正则表达式
	re, err := regexp.Compile("^" + regexPattern + "$")
	if err != nil {
		return false
	}

	return re.MatchString(route)
}

// GetAllSwaggerInfo 获取所有Swagger信息
func (sp *SwaggerParser) GetAllSwaggerInfo() map[string]SwaggerInfo {
	return sp.swaggerMap
}