package gradle

/**
Displays the results of `gradlew tasks` in a tree structure.
This is GradleBehaviour's last secondary-tab.
*/
class GradleTasksBehaviour(
    val folder : File
) : TreeBehaviour( "Tasks", Context(Context.FOLDER, folder) ) {

    init {
        iconName = "tasks"
    }

    override meth attached( container : Container ) {
        super.attached( container )
        refresh()
    }

    meth refresh() {
        message( "Building tasks" )

        $( ./gradlew tasks )
            .dir(folder)
            .evalInNewThread( "gradlew_tasks", this:>parseOutput, this:>showMessage )
    }

    // TODO Feather doesn't look in super-classes when looking for Function :-( Remove when fixed.
    meth showMessage( message : String ) {
        message( message )
    }

    /**
     * Parses the output from: `gradlew tasks` and populate the tree.
     *
     * We detect the start of a `section` when we find a line of dashes, which is the same length as the
     * previous line. The previous line is the section's name.
     *
     * If we have found a section, and then find a line with " - " in the middle,
     * then to the left of the dash is the task name. To the right, the task's description.
     * The description will be used as a tooltip.
     *
     */
    meth parseOutput(output: String) {

        var sectionCount = 0

        root = TreeItem("tasks")
        root.leaf = false
        var section: TreeItem = null

        var previousLine: String = null
        val lines = output.split("\n")
        for (l in lines) {
            val line = l.trim()

            // Was the previous line a "section"?
            if (line.startsWith("-") && previousLine.length() == line.length()) {

                if (previousLine == "Rules") {
                    section = null
                } else {
                    section = TreeItem(previousLine)
                    section.leaf = false
                    root.add(section)
                    section.expanded = sectionCount < 2
                    sectionCount ++
                }

            } else if (section != null && line != "") {
                val dash = line.indexOf(" - ")
                if (dash > 0) {
                    val taskName = line.substring(0, dash).trim()
                    val description = line.substring(dash + 3)
                    val context = Context(Gradle.GRADLE_TASK, GradleTask(folder,taskName) )
                    section.add( TreeItem( taskName, context ).description( description ) )
                }
            }
            previousLine = line
        }
        message = ""
    }
}