package org.iwakura.larcjb.rollback

import com.intellij.openapi.diagnostic.Logger
import com.intellij.openapi.project.Project
import com.intellij.openapi.vcs.FilePath
import com.intellij.openapi.vcs.VcsException
import com.intellij.openapi.vcs.changes.Change
import com.intellij.openapi.vcs.rollback.RollbackEnvironment
import com.intellij.openapi.vcs.rollback.RollbackProgressListener
import com.intellij.openapi.vfs.VirtualFile
import org.iwakura.larcjb.LarcExecutable

/**
 * Handles revert/rollback operations for Larc VCS.
 */
class LarcRollbackEnvironment(
    private val project: Project,
    private val executable: LarcExecutable
) : RollbackEnvironment {

    private val log = Logger.getInstance(LarcRollbackEnvironment::class.java)

    override fun getRollbackOperationName(): String = "Revert"

    override fun rollbackChanges(
        changes: MutableList<out Change>,
        exceptions: MutableList<VcsException>,
        listener: RollbackProgressListener
    ) {
        /*
         * TODO(kroot): implement rollback/revert functionality
         *
         * This requires larc to support a revert command like:
         *   larc revert <file>
         * or
         *   larc checkout <file>
         *
         * For now, we'll just log that this isn't implemented yet
         */
        log.warn("Rollback not yet implemented for Larc VCS")
        exceptions.add(VcsException("Rollback is not yet implemented for Larc VCS"))
    }

    override fun rollbackMissingFileDeletion(
        files: List<FilePath>,
        exceptions: MutableList<in VcsException>,
        listener: RollbackProgressListener
    ) {
        /* TODO(kroot): restore deleted files from last revision */
        log.warn("Rollback missing file deletion not implemented")
    }

    override fun rollbackModifiedWithoutCheckout(
        files: List<VirtualFile>,
        exceptions: MutableList<in VcsException>,
        listener: RollbackProgressListener
    ) {
        /* TODO(kroot): implement modified file rollback */
        log.warn("Rollback modified without checkout not implemented")
    }
}