package org.iwakura.larcjb

import com.intellij.openapi.project.ProjectManager
import com.intellij.openapi.vcs.ProjectLevelVcsManager
import com.intellij.openapi.vcs.VcsKey
import com.intellij.openapi.vcs.VcsRootChecker
import com.intellij.openapi.vfs.VirtualFile

/**
 * Determines if a directory is a larc repository by checking for .larc directory.
 */
class LarcRootChecker : VcsRootChecker() {

    override fun getSupportedVcs(): VcsKey {
        /*
         * Get VcsKey from any open project that has Larc VCS registered.
         * This is needed because VcsKey constructor is package-private.
         */
        val projects = ProjectManager.getInstance().openProjects
        for (project in projects) {
            val vcsManager = ProjectLevelVcsManager.getInstance(project)
            val vcs = vcsManager.findVcsByName(LarcVcs.NAME)
            if (vcs != null) {
                return vcs.keyInstanceMethod
            }
        }
        /* Fallback: return key from default project */
        val defaultProject = ProjectManager.getInstance().defaultProject
        val vcs = ProjectLevelVcsManager.getInstance(defaultProject).findVcsByName(LarcVcs.NAME)
        return vcs?.keyInstanceMethod ?: throw IllegalStateException("Larc VCS not registered")
    }

    override fun isRoot(path: VirtualFile): Boolean {
        val larcDir = path.findChild(LarcVcs.LARC_DIR)
        return larcDir != null && larcDir.isDirectory
    }

    override fun isVcsDir(dirName: String): Boolean {
        return dirName.equals(LarcVcs.LARC_DIR, ignoreCase = false)
    }

    override fun validateRoot(path: VirtualFile): Boolean {
        /*
         * Additional validation: check for larc.db inside .larc
         * This distinguishes larc repos from other tools that might use .larc
         */
        val larcDir = path.findChild(LarcVcs.LARC_DIR) ?: return false
        return larcDir.findChild("larc.db") != null
    }
}