package ass

import (
	"fmt"
	"regexp"
	"strconv"
	"strings"

	"sub-cli/internal/model"
)

// parseFormatLine 解析格式行中的各个字段
func parseFormatLine(formatStr string) []string {
	fields := strings.Split(formatStr, ",")
	result := make([]string, 0, len(fields))
	
	for _, field := range fields {
		result = append(result, strings.TrimSpace(field))
	}
	
	return result
}

// parseStyleLine 解析样式行
func parseStyleLine(line string) []string {
	// 去掉"Style:"前缀
	styleStr := strings.TrimPrefix(line, "Style:")
	return splitCSV(styleStr)
}

// parseEventLine 解析事件行
func parseEventLine(line string) []string {
	return splitCSV(line)
}

// splitCSV 拆分CSV格式的字符串，但保留Text字段中的逗号
func splitCSV(line string) []string {
	var result []string
	inText := false
	current := ""
	
	for _, char := range line {
		if char == ',' && !inText {
			result = append(result, strings.TrimSpace(current))
			current = ""
		} else {
			current += string(char)
			// 这是个简化处理，实际ASS格式更复杂
			// 当处理到足够数量的字段后，剩余部分都当作Text字段
			if len(result) >= 9 {
				inText = true
			}
		}
	}
	
	if current != "" {
		result = append(result, strings.TrimSpace(current))
	}
	
	return result
}

// parseASSTimestamp 解析ASS格式的时间戳 (h:mm:ss.cc)
func parseASSTimestamp(timeStr string) model.Timestamp {
	// 匹配 h:mm:ss.cc 格式
	re := regexp.MustCompile(`(\d+):(\d+):(\d+)\.(\d+)`)
	matches := re.FindStringSubmatch(timeStr)
	
	if len(matches) == 5 {
		hours, _ := strconv.Atoi(matches[1])
		minutes, _ := strconv.Atoi(matches[2])
		seconds, _ := strconv.Atoi(matches[3])
		// ASS使用厘秒（1/100秒），需要转换为毫秒
		centiseconds, _ := strconv.Atoi(matches[4])
		milliseconds := centiseconds * 10
		
		return model.Timestamp{
			Hours:        hours,
			Minutes:      minutes,
			Seconds:      seconds,
			Milliseconds: milliseconds,
		}
	}
	
	// 返回零时间戳，如果解析失败
	return model.Timestamp{}
}

// formatASSTimestamp 格式化为ASS格式的时间戳 (h:mm:ss.cc)
func formatASSTimestamp(timestamp model.Timestamp) string {
	// ASS使用厘秒（1/100秒）
	centiseconds := timestamp.Milliseconds / 10
	return fmt.Sprintf("%d:%02d:%02d.%02d", 
		timestamp.Hours, 
		timestamp.Minutes, 
		timestamp.Seconds,
		centiseconds)
}