pragma Singleton

import QtQuick
import Qt.labs.folderlistmodel
import Quickshell
import Quickshell.Io
import qs.Commons
import qs.Services

Singleton {
  id: root

  property var schemes: []
  property bool scanning: false
  property string schemesDirectory: Quickshell.shellDir + "/Assets/ColorScheme"
  property string colorsJsonFilePath: Settings.configDir + "colors.json"

  Connections {
    target: Settings.data.colorSchemes
    function onDarkModeChanged() {
      Logger.log("ColorScheme", "Detected dark mode change")
      if (!Settings.data.colorSchemes.useWallpaperColors && Settings.data.colorSchemes.predefinedScheme) {
        // Re-apply current scheme to pick the right variant
        applyScheme(Settings.data.colorSchemes.predefinedScheme)
      }
      // Toast: dark/light mode switched
      const enabled = !!Settings.data.colorSchemes.darkMode
      const label = enabled ? "Dark Mode" : "Light Mode"
      const description = enabled ? "Enabled" : "Enabled"
      ToastService.showNotice(label, description)
    }
  }

  // --------------------------------
  function init() {
    // does nothing but ensure the singleton is created
    // do not remove
    Logger.log("ColorScheme", "Service started")
    loadColorSchemes()
  }

  function loadColorSchemes() {
    Logger.log("ColorScheme", "Load ColorScheme")
    scanning = true
    schemes = []
    // Unsetting, then setting the folder will re-trigger the parsing!
    folderModel.folder = ""
    folderModel.folder = "file://" + schemesDirectory
  }

  function getBasename(path) {
    if (!path)
      return ""
    var chunks = path.split("/")
    var last = chunks[chunks.length - 1]
    return last.endsWith(".json") ? last.slice(0, -5) : last
  }

  function resolveSchemePath(nameOrPath) {
    if (!nameOrPath)
      return ""
    if (nameOrPath.indexOf("/") !== -1) {
      return nameOrPath
    }
    return schemesDirectory + "/" + nameOrPath.replace(".json", "") + ".json"
  }

  function applyScheme(nameOrPath) {
    // Force reload by bouncing the path
    var filePath = resolveSchemePath(nameOrPath)
    schemeReader.path = ""
    schemeReader.path = filePath
  }

  FolderListModel {
    id: folderModel
    nameFilters: ["*.json"]
    showDirs: false
    sortField: FolderListModel.Name
    onStatusChanged: {
      if (status === FolderListModel.Ready) {
        var files = []
        for (var i = 0; i < count; i++) {
          var filepath = schemesDirectory + "/" + get(i, "fileName")
          files.push(filepath)
        }
        schemes = files
        scanning = false
        Logger.log("ColorScheme", "Listed", schemes.length, "schemes")
        // Normalize stored scheme to basename and re-apply if necessary
        var stored = Settings.data.colorSchemes.predefinedScheme
        if (stored) {
          var basename = getBasename(stored)
          if (basename !== stored) {
            Settings.data.colorSchemes.predefinedScheme = basename
          }
          if (!Settings.data.colorSchemes.useWallpaperColors) {
            applyScheme(basename)
          }
        }
      }
    }
  }

  // Internal loader to read a scheme file
  FileView {
    id: schemeReader
    onLoaded: {
      try {
        var data = JSON.parse(text())
        var variant = data
        // If scheme provides dark/light variants, pick based on settings
        if (data && (data.dark || data.light)) {
          if (Settings.data.colorSchemes.darkMode) {
            variant = data.dark || data.light
          } else {
            variant = data.light || data.dark
          }
        }
        writeColorsToDisk(variant)
        Logger.log("ColorScheme", "Applying color scheme:", getBasename(path))
      } catch (e) {
        Logger.error("ColorScheme", "Failed to parse scheme JSON:", e)
      }
    }
  }

  // Writer to colors.json using a JsonAdapter for safety
  FileView {
    id: colorsWriter
    path: colorsJsonFilePath
    onSaved: {

      // Logger.log("ColorScheme", "Colors saved")
    }
    JsonAdapter {
      id: out
      property color mPrimary: "#000000"
      property color mOnPrimary: "#000000"
      property color mSecondary: "#000000"
      property color mOnSecondary: "#000000"
      property color mTertiary: "#000000"
      property color mOnTertiary: "#000000"
      property color mError: "#ff0000"
      property color mOnError: "#000000"
      property color mSurface: "#ffffff"
      property color mOnSurface: "#000000"
      property color mSurfaceVariant: "#cccccc"
      property color mOnSurfaceVariant: "#333333"
      property color mOutline: "#444444"
      property color mShadow: "#000000"
    }
  }

  function writeColorsToDisk(obj) {
    function pick(o, a, b, fallback) {
      return (o && (o[a] || o[b])) || fallback
    }
    out.mPrimary = pick(obj, "mPrimary", "primary", out.mPrimary)
    out.mOnPrimary = pick(obj, "mOnPrimary", "onPrimary", out.mOnPrimary)
    out.mSecondary = pick(obj, "mSecondary", "secondary", out.mSecondary)
    out.mOnSecondary = pick(obj, "mOnSecondary", "onSecondary", out.mOnSecondary)
    out.mTertiary = pick(obj, "mTertiary", "tertiary", out.mTertiary)
    out.mOnTertiary = pick(obj, "mOnTertiary", "onTertiary", out.mOnTertiary)
    out.mError = pick(obj, "mError", "error", out.mError)
    out.mOnError = pick(obj, "mOnError", "onError", out.mOnError)
    out.mSurface = pick(obj, "mSurface", "surface", out.mSurface)
    out.mOnSurface = pick(obj, "mOnSurface", "onSurface", out.mOnSurface)
    out.mSurfaceVariant = pick(obj, "mSurfaceVariant", "surfaceVariant", out.mSurfaceVariant)
    out.mOnSurfaceVariant = pick(obj, "mOnSurfaceVariant", "onSurfaceVariant", out.mOnSurfaceVariant)
    out.mOutline = pick(obj, "mOutline", "outline", out.mOutline)
    out.mShadow = pick(obj, "mShadow", "shadow", out.mShadow)

    // Force a rewrite by updating the path
    colorsWriter.path = ""
    colorsWriter.path = colorsJsonFilePath
    colorsWriter.writeAdapter()
  }
}