package fileproperties

import uk.co.nickthecoder.glok.application.Platform

/**
 * Also adds features for
 * Only applicable to unix-like operating systems (i.e. NOT Windows).
 */
class FileProperties : SimpleComponent() {

    class val lsPattern = Pattern.compile( "([^\\s]*)\\s*[^\\s]*\\s*([^\\s]*)\\s*([^\\s]*)\\s*([^\s]*)" )

    override meth register() {

        if (!Platform.INSTANCE.isWindows()) {
            addFeatures( Context.FOLDER, 99 ).apply {
                val folderProperties = contextAction( "Folder Properties", ::filePropertiesAction )
                val changeOwner = contextAction( "Change Owner", ::changeOwnerAction )
                val changeGroup = contextAction( "Change Group", ::changeGroupAction )
                val changePermissions = contextAction( "Change Permissions", ::changePermissionsAction )
    
                menus( MenuFeature( "Folder", separator, folderProperties, changeOwner, changeGroup, changePermissions ) )
                contextMenu( separator, folderProperties, changeOwner, changeGroup, changePermissions )
            }
    
            addFeatures( Context.FILE ).apply {
                val fileProperties = contextAction( "File Properties", ::filePropertiesAction )
                val changeOwner = contextAction( "Change Owner", ::changeOwnerAction )
                val changeGroup = contextAction( "Change Group", ::changeGroupAction )
                val changePermissions = contextAction( "Change Permissions", ::changePermissionsAction )

                menus( MenuFeature( "File", separator, fileProperties, changeOwner, changeGroup, changePermissions ) )
                contextMenu( separator, fileProperties, changeOwner, changeGroup, changePermissions )
            }
        }
    }

    // ==== Actions ====

    func filePropertiesAction( context : Context ) {
        openFileProperties( context.value as File )
    }

    func changeOwnerAction( context : Context ) {
        ChangeOwnerForm( context.value as File ).promptInNewTab()
    }

    func changeGroupAction( context : Context ) {
        ChangeGroupForm( context.value as File ).promptInNewTab()
    }

    func changePermissionsAction( context : Context ) {
        ChangePermissionsForm( context.value as File ).promptInNewTab()
    }

    // ==== API ====
    func openFileProperties( fileOrFolder : File ) {
        filePropertiesBehaviour( fileOrFolder ).openBehaviour()
    }

    func filePropertiesBehaviour( fileOrFolder : File ) : FormBehaviour {
        val title = if (fileOrFolder.isFolder()) "Folder Properties" else "File Properties"
        val form = FileOrFolderPropertiesForm( title, fileOrFolder )
        return FileOrFolderPropertiesBehaviour( form )
    }
    
}

/**
 * Displays file properties. All form elements are read-only.
 * See ChangeOwner, ChangeGroup and ChangePermissions.
 */
class FileOrFolderPropertiesForm( title : String, val fileOrFolder : File ) : Form( title ) {

    val name = stringProperty( "Name", fileOrFolder.name ).apply {
        readOnly = true
    }

    val location = stringProperty( "Location", fileOrFolder.parentFile.path ).apply {
        readOnly = true
    }

    val mimeType = stringProperty( "Mime Type", "" ).apply {
        readOnly = true
        columns = 30
    }

    val owner = stringProperty( "Owner", "" ).apply {
        readOnly = true
        columns = 20
    }

    val group = stringProperty( "Group", "" ).apply {
        readOnly = true
        columns = 20
    }

    val size = stringProperty( "Size", toHumanBytes(fileOrFolder.length()) ).apply {
        readOnly = true
        columns = 10
    }

    val permissions = stringProperty( "Permissions", "" ).apply {
        readOnly = true
        columns = 10
    }

    init {
        val mime = guessMimeType( fileOrFolder )
        if (mime != null) {
            mimeType.value = mime
        }
        // TODO Update owner, group
        val ls = $( ls -ld '$fileOrFolder' ).eval()
        val matcher = FileProperties.lsPattern.matcher( ls )
        if (matcher.find()) {
            permissions.value = matcher.group(1)
            owner.value = matcher.group(2)
            group.value = matcher.group(3)
        }
    }

    override meth elements() = listOf<FormElement>(
        name, location, mimeType, owner, group, size, permissions
    )

}

/**
 * Displays file properties. All form elements are read-only.
 * See ChangeOwner, ChangeGroup and ChangePermissions.
 */
class FileOrFolderPropertiesBehaviour( val form : FileOrFolderPropertiesForm ) : FormBehaviour( form.title, form ) {

    init {
        contexts.addAll( contextsForFile( form.fileOrFolder ) )
    }

    override meth onOK() {
        closeCurrentBehaviour()
    }

    override meth onCancel() {
        closeCurrentBehaviour()
    }

}