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namespace Fake
open System.IO
open System.Text

[<AutoOpen>]
module FileHelper = 
  /// Sets the directory readonly 
  let setDirectoryReadOnly readOnly (dir:DirectoryInfo) = 
    if dir.Exists then
      let isReadOnly = dir.Attributes &&& FileAttributes.ReadOnly = FileAttributes.ReadOnly
      if readOnly && (not isReadOnly) then 
        dir.Attributes <- dir.Attributes ||| FileAttributes.ReadOnly
      if (not readOnly) && not isReadOnly then               
        dir.Attributes <- dir.Attributes &&& (~~~FileAttributes.ReadOnly)  
  
  /// Sets all files in the directory readonly 
  let rec SetDirReadOnly readOnly (dir:DirectoryInfo) =
    dir.GetDirectories() |> Seq.iter (fun dir ->
      SetDirReadOnly readOnly dir
      setDirectoryReadOnly readOnly dir)
    dir.GetFiles() |> Seq.iter (fun file -> file.IsReadOnly <- readOnly)    
    
  /// Sets all files in the directory readonly 
  let SetReadOnly readOnly (files: string seq) =
    files |> Seq.iter (fun file ->
      let fi = new FileInfo(file)
      if fi.Exists then 
        fi.IsReadOnly <- readOnly
      else
        let di = new DirectoryInfo(file)
        setDirectoryReadOnly readOnly di)
        
        
  /// Deletes a directory if it exists
  let DeleteDir x =   
    let dir = new DirectoryInfo(x)    
    if dir.Exists then 
      // set all files readonly = false
      !+ "/**/*.*"
        |> SetBaseDir dir.FullName
        |> Scan
        |> (SetReadOnly false)
        
      log <| sprintf "Deleting %s" dir.FullName
      dir.Delete true
    else
      log <| sprintf "%s does not exist." dir.FullName
      
  /// Creates a directory if it does not exist
  let CreateDir x =   
    let dir = new DirectoryInfo(x)
    if not dir.Exists then 
      log <| sprintf "Creating %s" dir.FullName
      dir.Create()
    else
      log <| sprintf "%s does already exist." dir.FullName
      
  /// Creates a file if it does not exist
  let CreateFile x =   
    let file = new FileInfo(x)
    if not file.Exists then 
      log <| sprintf "Creating %s" file.FullName
      let newFile = file.Create()
      newFile.Close()
    else
      log <| sprintf "%s does already exist." file.FullName
      
  /// Deletes a file if it exist
  let DeleteFile x =   
    let file = new FileInfo(x)    
    if file.Exists then 
      log <| sprintf "Deleting %s" file.FullName
      file.Delete()
    else
      log <| sprintf "%s does not exist." file.FullName                
      
  let (|File|Directory|) (fileSysInfo : FileSystemInfo) =
    match fileSysInfo with
      | :? FileInfo as file -> File (file.Name)
      | :? DirectoryInfo as dir -> Directory (dir.Name, seq { for x in dir.GetFileSystemInfos() -> x })
      | _ -> failwith "No file or directory given."      
        
  /// Active Pattern for determining file extension
  let (|EndsWith|_|) extension (file : string) = 
      if file.EndsWith extension  then Some()  else None
   
  /// Active Pattern for determining file name   
  let (|FileInfoFullName|) (f:FileInfo) = f.FullName
  
  /// Active Pattern for determining FileInfoNameSections
  let (|FileInfoNameSections|) (f:FileInfo) = (f.Name,f.Extension,f.FullName)
  
  /// Copies a single file to the target
  ///   param target: The targetDirectory
  ///   param file: The fileName
  let CopyFile target file =
    let fi = new FileInfo(file)
    let targetName = target + fi.Name
    log <| sprintf "Copy %s to %s" file targetName
    fi.CopyTo(targetName,true) |> ignore    
    

  /// Copies the files to the target
  let Copy target files =
    files |> Seq.iter (CopyFile target)   
    
  let SilentCopy target files =
    files |> Seq.iter (fun file ->
      let fi = new FileInfo(file)
      let targetName = target + fi.Name
      let targetFI = new FileInfo(targetName)
      if targetFI.Exists then
        if fi.LastWriteTime > targetFI.LastWriteTime then
          targetFI.Attributes <- FileAttributes.Normal
          fi.CopyTo(targetName,true) |> ignore
      else
        fi.CopyTo(targetName) |> ignore)
                 

  /// Copies the files to the target
  let CopyFiles target files = Copy target files  
  
  /// Exclude SVN files (path with .svn)
  let excludeSVNFiles (path:string) = not <| path.Contains ".svn"
  
  /// Includes all files
  let allFiles (path:string) = true
  
  /// Copies a directory recursivly
  /// If the target directory does not exist, it will be created
  let CopyDir target source filterFile =
    CreateDir target
    Directory.GetFiles(source, "*.*", SearchOption.AllDirectories)
    |> Seq.filter filterFile
    |> Seq.iter (fun file -> 
        let newFile = target + file.Remove(0, source.Length)
        log <| sprintf "%s => %s" file newFile
        Directory.CreateDirectory(Path.GetDirectoryName(newFile)) |> ignore
        File.Copy(file, newFile, true))
    
  /// Cleans a directory
  let CleanDir dir =
    let di = new DirectoryInfo(dir)
    if di.Exists then
      log <| sprintf "Deleting content of %s" dir
      // delete all files
      Directory.GetFiles(dir, "*.*", SearchOption.AllDirectories)
        |> Seq.iter (fun file -> 
            let fi = new FileInfo(file)
            fi.IsReadOnly <- false
            fi.Delete())
      
      // deletes all subdirectories
      let rec deleteDirs actDir =
        Directory.GetDirectories(actDir) |> Seq.iter deleteDirs
        Directory.Delete(actDir,true)
      
      Directory.GetDirectories(dir) |> Seq.iter deleteDirs      
    else
      CreateDir dir
      
    // set writeable
    File.SetAttributes(dir,FileAttributes.Normal)      
    
  /// Reads a file line by line
  let ReadFile file = StringHelper.ReadFile file  

  /// Reads a csv file line by line
  /// delimiter is a ,
  let ReadCSVFile(file:string) =             
    let csvRegEx = new System.Text.RegularExpressions.Regex(",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))")   
           
    seq {for line in ReadFile file ->
          csvRegEx.Split(line) 
            |> Array.map (fun s -> s.Trim([| '"' |]))}  

               
  /// Appends all given files to one file 
  let AppendTextFiles newFileName files =    
    let fi = new FileInfo(newFileName)
    if fi.Exists then failwith "File %s already exists."
    use writer = new StreamWriter(fi.FullName, false, Encoding.Default);
    
    files 
      |> Seq.iter (fun file ->       
           log <| sprintf "Appending %s to %s" file fi.FullName
           ReadFile file |> Seq.iter(fun line -> writer.WriteLine(line)))
           
    writer.Close()
    
  /// Converts a file to it's full file system name
  let FullName fileName = (new FileInfo(fileName)).FullName
    
  /// Compares the given files for changes
  /// If delete = true then equal files will be removed  
  let CompareFiles delete originalFileName compareFileName =  
    let ori = new FileInfo(originalFileName)
    let comp = new FileInfo(compareFileName)
    if ori.Exists && comp.Exists && ori.LastWriteTime = comp.LastWriteTime && ori.Length = comp.Length then
      if delete then      
        comp.Attributes <- FileAttributes.Normal
        comp.Delete()
        log <| sprintf "Deleting File: %s" comp.FullName
      else
        log <| sprintf "Files equal: %s" comp.FullName
      true
    else false
    
  /// Checks if the directory exists
  let TestDir dir =
    let di = new DirectoryInfo(dir)
    
    if di.Exists then true else
    log <| sprintf "%s not found" di.FullName
    false
 
  /// Checks the srcFiles for changes to the last release
  ///  param lastReleaseDir: The directory of the last release
  ///  param patchDir: The target director
  ///  param srcFiles: The source files
  let GeneratePatch lastReleaseDir patchDir srcFiles =
    srcFiles
      |> Seq.map (fun n -> 
           let newFile = toRelativePath n 
           let oldFile = lastReleaseDir + newFile.TrimStart('.')
           newFile,oldFile)         
      |> Seq.filter (fun (newF,oldF) -> CompareFiles false oldF newF |> not)
      |> Seq.iter (fun (newF,oldF) -> CopyFile patchDir newF)