pragma Singleton
pragma ComponentBehavior: Bound

import QtCore
import QtQuick
import Quickshell
import Quickshell.Io
import qs.Common

Singleton {
    id: root

    readonly property string greetCfgDir: Quickshell.env("DMS_GREET_CFG_DIR") || "/etc/greetd/.dms"
    readonly property string sessionConfigPath: greetCfgDir + "/session.json"
    readonly property string memoryFile: greetCfgDir + "/memory.json"

    property string lastSessionId: ""
    property string lastSuccessfulUser: ""
    property bool isLightMode: false
    property bool nightModeEnabled: false

    Component.onCompleted: {
        Quickshell.execDetached(["mkdir", "-p", greetCfgDir])
        loadMemory()
        loadSessionConfig()
    }

    function loadMemory() {
        parseMemory(memoryFileView.text())
    }

    function loadSessionConfig() {
        parseSessionConfig(sessionConfigFileView.text())
    }

    function parseSessionConfig(content) {
        try {
            if (content && content.trim()) {
                const config = JSON.parse(content)
                isLightMode = config.isLightMode !== undefined ? config.isLightMode : false
                nightModeEnabled = config.nightModeEnabled !== undefined ? config.nightModeEnabled : false
            }
        } catch (e) {
            console.warn("Failed to parse greeter session config:", e)
        }
    }

    function parseMemory(content) {
        try {
            if (content && content.trim()) {
                const memory = JSON.parse(content)
                lastSessionId = memory.lastSessionId !== undefined ? memory.lastSessionId : ""
                lastSuccessfulUser = memory.lastSuccessfulUser !== undefined ? memory.lastSuccessfulUser : ""
            }
        } catch (e) {
            console.warn("Failed to parse greetd memory:", e)
        }
    }

    function saveMemory() {
        memoryFileView.setText(JSON.stringify({
            "lastSessionId": lastSessionId,
            "lastSuccessfulUser": lastSuccessfulUser
        }, null, 2))
    }

    function setLastSessionId(id) {
        lastSessionId = id || ""
        saveMemory()
    }

    function setLastSuccessfulUser(username) {
        lastSuccessfulUser = username || ""
        saveMemory()
    }

    FileView {
        id: memoryFileView
        path: root.memoryFile
        blockLoading: false
        blockWrites: false
        atomicWrites: true
        watchChanges: false
        printErrors: false
        onLoaded: {
            parseMemory(memoryFileView.text())
        }
    }

    FileView {
        id: sessionConfigFileView
        path: root.sessionConfigPath
        blockLoading: false
        blockWrites: true
        atomicWrites: false
        watchChanges: false
        printErrors: true
        onLoaded: {
            parseSessionConfig(sessionConfigFileView.text())
        }
        onLoadFailed: error => {
            console.warn("Could not load greeter session config from", root.sessionConfigPath, "error:", error)
        }
    }
}