package org.iwakura.larcjb.actions

import com.intellij.openapi.actionSystem.ActionUpdateThread
import com.intellij.openapi.actionSystem.AnAction
import com.intellij.openapi.actionSystem.AnActionEvent
import com.intellij.openapi.project.DumbAware
import com.intellij.openapi.project.Project
import com.intellij.openapi.ui.DialogWrapper
import com.intellij.openapi.vcs.ProjectLevelVcsManager
import com.intellij.openapi.vfs.VirtualFile
import com.intellij.ui.components.JBScrollPane
import com.intellij.ui.components.JBTextArea
import org.iwakura.larcjb.LarcExecutable
import org.iwakura.larcjb.LarcVcs
import java.awt.Dimension
import javax.swing.JComponent

/**
 * Action to show commit log.
 * TODO(kroot): Replace with proper VcsHistoryProvider integration
 */
class LarcLogAction : AnAction(), DumbAware {

    override fun actionPerformed(e: AnActionEvent) {
        val project = e.project ?: return
        val roots = getLarcRoots(project)

        if (roots.isEmpty()) return

        val executable = LarcExecutable(project)

        /*
         * For now, show simple dialog with log output
         * Later: integrate with VcsLogProvider for proper UI
         */
        val logOutput = buildString {
            for (root in roots) {
                appendLine("${root.name}")
                val result = executable.log(root, 50)
                if (result.isSuccess) {
                    appendLine(result.stdout)
                } else {
                    appendLine("Error: ${result.stderr}")
                }
                appendLine()
            }
        }

        LogDialog(project, logOutput).show()
    }

    override fun update(e: AnActionEvent) {
        val project = e.project
        e.presentation.isEnabledAndVisible = project != null && getLarcRoots(project).isNotEmpty()
    }

    override fun getActionUpdateThread(): ActionUpdateThread = ActionUpdateThread.BGT

    private fun getLarcRoots(project: Project): List<VirtualFile> {
        return ProjectLevelVcsManager.getInstance(project)
            .allVcsRoots
            .filter { it.vcs?.name == LarcVcs.NAME }
            .mapNotNull { it.path }
    }

    private class LogDialog(project: Project, private val logContent: String) : DialogWrapper(project) {
        init {
            title = "Larc Log"
            init()
        }

        override fun createCenterPanel(): JComponent {
            val textArea = JBTextArea(logContent).apply {
                isEditable = false
                font = java.awt.Font("Monospaced", java.awt.Font.PLAIN, 12)
            }
            return JBScrollPane(textArea).apply {
                preferredSize = Dimension(800, 600)
            }
        }
    }
}