unit PackageLinkIntf;

{$mode objfpc}{$H+}

interface

uses
  SysUtils,
  // LazUtils
  LazFileUtils,
  // IdeIntf
  PackageDependencyIntf, PackageIntf;

type

  { TPackageLink
    There are several types of package links.

    Global: These are collected from the lazarus source directory.
            EnvironmentOptions.LazarusDirectory+'packager/globallinks/*.lpl'
            This way packages can install/uninstall themselves to one lazarus
            source directory, and this lazarus directory can then be shared
            by several users/configs.

    User:   These are collected from the user config directory, from the file
            packagelinks.xml.
            These links are maintained by the IDE. Everytime the user opens a
            package a user link is created, so that the next time the package
            can be automatically opened. The list is checked by the IDE from
            time to time and missing packages are first marked and after several
            months deleted from the list.
            Relative files are expanded with the Lazarus directory.
  }

  TPkgLinkOrigin = (
    ploGlobal,
    ploOnline,
    ploUser
    );
  TPkgLinkOrigins = set of TPkgLinkOrigin;

const
  AllPkgLinkOrigins = [low(TPkgLinkOrigin)..high(TPkgLinkOrigin)];

type

  { TPackageLink }

  TPackageLink = class(TLazPackageID)
  private
    procedure SetFilename(const AValue: string);
  protected
    FFileDate: TDateTime;
    FFileDateValid: boolean;
    FFilename: string;         // Filename or URL
    FLPLFileDate: TDateTime;
    FLPLFilename: string;
    FOrigin: TPkgLinkOrigin;
    FLastUsed: TDateTime;
  public
    constructor Create; override;
    destructor Destroy; override;
    function IsMakingSense: boolean;
    function GetEffectiveFilename: string; virtual; abstract;
    procedure Reference; virtual; abstract;
    procedure Release; virtual; abstract;
  public
    property LPKFileDateValid: boolean read FFileDateValid write FFileDateValid;
    property LPKFileDate: TDateTime read FFileDate write FFileDate;
    // if relative it is relative to the LazarusDir
    property LPKFilename: string read FFilename write SetFilename;
    // URL is also stored in FFilename.
    property LPKUrl: string read FFilename write FFilename;
    property LPLFilename: string read FLPLFilename write FLPLFilename;
    property LPLFileDate: TDateTime read FLPLFileDate write FLPLFileDate;
    property Origin: TPkgLinkOrigin read FOrigin write FOrigin;
    property LastUsed: TDateTime read FLastUsed write FLastUsed;
  end;

  { TPackageLinks }

  TPackageLinks = class
  private
  public
    function FindLinkWithPkgName(const PkgName: string): TPackageLink; virtual; abstract;
    function FindLinkWithDependency(Dependency: TPkgDependencyID): TPackageLink; virtual; abstract;
    function FindLinkWithPackageID(APackageID: TLazPackageID): TPackageLink; virtual; abstract;
    function FindLinkWithFilename(const PkgName, LPKFilename: string): TPackageLink; virtual; abstract;
    procedure IteratePackages(MustExist: boolean; Event: TIteratePackagesEvent;
      Origins: TPkgLinkOrigins = AllPkgLinkOrigins); virtual; abstract;
    function AddOnlineLink(const PkgFilename, PkgName: string;
      PkgVersion: TPkgVersion): TPackageLink; virtual; abstract;
    function AddUserLink(APackage: TIDEPackage): TPackageLink; virtual; abstract;
    // do not use this if package is open in IDE
    function AddUserLink(const PkgFilename, PkgName: string): TPackageLink; virtual; abstract;
    procedure RemoveUserLink(Link: TPackageLink); virtual; abstract;
    procedure RemoveUserLinks(APackageID: TLazPackageID); virtual; abstract;
  end;

var
  PkgLinks: TPackageLinks;

function IsUrl(const AText: string): Boolean;


implementation

// This should be in FPC's StrUtils.
function StartsStr(const ASubText, AText: string): Boolean;
begin
  Result := Copy(AText,1,Length(ASubText)) = ASubText;
end;

function IsUrl(const AText: string): Boolean;
begin
  Result := (AText='') or StartsStr('http://', AText) or StartsStr('https://', AText);
end;

{ TPackageLink }

constructor TPackageLink.Create;
begin
  inherited Create;
end;

destructor TPackageLink.Destroy;
begin
  inherited Destroy;
end;

procedure TPackageLink.SetFilename(const AValue: string);
begin
  if FFilename=AValue then exit;
  FFilename:=TrimFilename(AValue);
end;

function TPackageLink.IsMakingSense: boolean;
begin
  Result:=IsValidPkgName(Name)
           and PackageFileNameIsValid(LPKFilename)
           and (CompareText(Name,ExtractFileNameOnly(LPKFilename))=0);
end;

end.