//
//  TextFormatter.swift
//  Note
//
//  Created by fish on 2026/7/13.
//

import Foundation

enum TextFormatter {

    static func formatLog(_ text: String) -> String {
        var content = text

        content = content.replacingOccurrences(of: "# ", with: "")
        content = content.replacingOccurrences(of: "#", with: "")
        content = content.replacingOccurrences(of: ";", with: "。")
        content = content.replacingOccurrences(of: "；", with: "。")
        content = content.replacingOccurrences(of: ".", with: "。")
        content = content.replacingOccurrences(of: "（", with: "(")
        content = content.replacingOccurrences(of: "）", with: ")")
        content = content.replacingOccurrences(of: "?", with: "？")
        content = content.replacingOccurrences(of: ",", with: "，")
        content = content.replacingOccurrences(of: ":", with: "：")
        content = content.replacingOccurrences(of: "日星期", with: "日 星期")
        content = "# " + content
        content = content.replacingOccurrences(of: "一、生活方面", with: "## 一、生活方面")
        content = content.replacingOccurrences(of: "二、交易方面", with: "## 二、交易方面")
        content = content.replacingOccurrences(of: "三、工作方面", with: "## 三、工作方面")

        return content
    }

    static func formatForCloud(_ text: String) -> String {
        var content = formatForShortcut(text)
        content = "# " + content
        content = insertEmptyLineAfterFirstLine(content)
        return content
    }

    static func formatForShortcut(_ text: String) -> String {
        var content = text
        content = content.replacingOccurrences(of: " ", with: "")
        content = content.replacingOccurrences(of: "　", with: "")
        content = content.replacingOccurrences(of: "\u{00A0}", with: "")
        content = content.replacingOccurrences(of: "# ", with: "")
        content = content.replacingOccurrences(of: "#", with: "")
        content = content.replacingOccurrences(of: "！", with: "。")
        content = content.replacingOccurrences(of: "!", with: "。")
        content = content.replacingOccurrences(of: ";", with: "。")
        content = content.replacingOccurrences(of: "；", with: "。")
        content = content.replacingOccurrences(of: ".", with: "。")
        content = content.replacingOccurrences(of: "（", with: "(")
        content = content.replacingOccurrences(of: "）", with: ")")
        content = content.replacingOccurrences(of: "?", with: "？")
        content = content.replacingOccurrences(of: ",", with: "，")
        content = content.replacingOccurrences(of: ":", with: "：")

        let numberReplacements: [(String, String)] = [
            ("20、", "二十、"), ("19、", "十九、"), ("18、", "十八、"), ("17、", "十七、"),
            ("16、", "十六、"), ("15、", "十五、"), ("14、", "十四、"), ("13、", "十三、"),
            ("12、", "十二、"), ("11、", "十一、"), ("10、", "十、"),
            ("9、", "九、"), ("8、", "八、"), ("7、", "七、"), ("6、", "六、"),
            ("5、", "五、"), ("4、", "四、"), ("3、", "三、"), ("2、", "二、"), ("1、", "一、")
        ]
        for (old, new) in numberReplacements {
            content = content.replacingOccurrences(of: old, with: new)
        }

        content = content.replacingOccurrences(of: "。", with: "。\n")
        content = content.replacingOccurrences(of: "？", with: "？\n")
        content = removeEmptyLines(content)
        content = content.replacingOccurrences(of: "：\\s*", with: "：\n\n", options: .regularExpression)
        content = content.replacingOccurrences(of: "。", with: "。\n")
        content = content.replacingOccurrences(of: "？", with: "？\n")
        content = content.replacingOccurrences(of: "：\n\n", with: "：")
        content = content.replacingOccurrences(of: "：一、", with: "：\n\n一、")
        content = content.replacingOccurrences(of: " ", with: "")
        content = content.replacingOccurrences(of: "---", with: "---\n")
        content = content.replacingOccurrences(of: "日星期", with: "日 星期")
        return content
    }

    static func formatForNote(_ text: String) -> String {
        var content = text
        content = content.replacingOccurrences(of: "# ", with: "")
        content = content.replacingOccurrences(of: "#", with: "")
        content = content.replacingOccurrences(of: "日星期", with: "日 星期")

        // 第一行固定为标题
        let allLines = removeEmptyLines(content).components(separatedBy: .newlines)
        guard let title = allLines.first else { return content }

        // 剩余内容按 --- 分段
        let bodyLines = Array(allLines.dropFirst())
        var groups: [[String]] = []
        var currentGroup: [String] = []
        for line in bodyLines {
            if line == "---" {
                if !currentGroup.isEmpty {
                    groups.append(currentGroup)
                    currentGroup = []
                }
            } else {
                currentGroup.append(line)
            }
        }
        if !currentGroup.isEmpty {
            groups.append(currentGroup)
        }

        var result = title
        for group in groups {
            result += "\n\n\n" + group.joined(separator: "\n")
        }
        return result.trimmingCharacters(in: .whitespacesAndNewlines)
    }

    static func removeEmptyLines(_ text: String) -> String {
        let lines = text.components(separatedBy: .newlines)
        let nonEmptyLines = lines.filter { !$0.trimmingCharacters(in: .whitespaces).isEmpty }
        return nonEmptyLines.joined(separator: "\n")
    }

    static func insertEmptyLineAfterFirstLine(_ text: String) -> String {
        var lines = text.components(separatedBy: .newlines)
        if !lines.isEmpty {
            lines.insert("", at: 1)
        }
        return lines.joined(separator: "\n")
    }
}