//
//  Foundation+Extensions.swift
//  KissMeConsole
//
//  Created by ened-book-m1 on 2023/05/26.
//

import Foundation
import KissMe


extension String {
    func maxSpace(_ length: Int) -> String {
        let count = unicodeScalars.reduce(0) {
            $0 + ($1.value >= 0x80 ? 2: 1)
        }
        if count < length {
            return appending(String(repeating: " ", count: length - count))
        }
        return self
    }
    
    func maxSpace(_ length: Int, digitBy: Int) -> String {
        guard let number = Int(self) else {
            return self
        }
        
        // Add comma
        let formatter = NumberFormatter()
        formatter.numberStyle = .decimal
        guard let str = formatter.string(from: NSNumber(value: number)) else {
            return self
        }
        
        // Add space
        let count = str.count
        if (count + count / 3) <= length {
            return str.appending(String(repeating: " ", count: length - count))
        }
        return self
    }
}


extension String {
    func parseCandleDate() -> String? {
        let fileNameFrag = split(separator: ".")
        guard fileNameFrag.count == 2 else {
            return nil
        }
        
        let candlePrefix = "candle-"
        guard fileNameFrag[0].prefix(candlePrefix.count) == candlePrefix, fileNameFrag[1] == "csv" else {
            return nil
        }
        
        let fileDateFrag = fileNameFrag[0].suffix(fileNameFrag[0].count - candlePrefix.count)
        return String(fileDateFrag)
    }
}


extension FileManager {
    
    /// period: If nil, all period of csv collected.
    /// candleDate: If nil, all date of csv collected.
    ///
    static func collectCsv(period: KissConsole.CandleFilePeriod?, candleDate: Date?) throws -> [URL] {
        guard let enumerator = FileManager.subPathFiles("data") else {
            throw GeneralError.noCsvFile
        }
        
        var csvUrls = [URL]()
        for case let fileUrl as URL in enumerator {
            guard fileUrl.pathExtension == "csv" else {
                continue
            }
            
            let fileName = fileUrl.lastPathComponent
            let periodDir = fileUrl.deletingLastPathComponent()
            let periodAtPath = periodDir.lastPathComponent
            let productNoDir = periodDir.deletingLastPathComponent()
            let productNo = productNoDir.lastPathComponent
            
            guard let _ = Int(productNo) else { continue }
            
            if let period = period {
                guard periodAtPath == period.rawValue else { continue }
            }
            if let candleDate = candleDate {
                guard candleDate.yyyyMMdd == fileName.parseCandleDate() else { continue }
            }
            csvUrls.append(fileUrl)
        }
        return csvUrls
    }
    
    static func collectShorts() throws -> [URL] {
        guard let enumerator = FileManager.subPathFiles("data") else {
            throw GeneralError.noCsvFile
        }

        var csvUrls = [URL]()
        for case let fileUrl as URL in enumerator {
            guard fileUrl.pathExtension == "csv" else {
                continue
            }
            
            //let fileName = fileUrl.lastPathComponent
            let categoryDir = fileUrl.deletingLastPathComponent()
            let categoryAtPath = categoryDir.lastPathComponent
            let productNoDir = categoryDir.deletingLastPathComponent()
            let productNo = productNoDir.lastPathComponent
            
            guard let _ = Int(productNo) else { continue }
            
            guard categoryAtPath == "shorts" else { continue }
            csvUrls.append(fileUrl)
        }
        return csvUrls
    }
}