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src/stores/settings.ts

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+// filepath: src/stores/settings.ts
+import { defineStore } from 'pinia'
+import { invoke } from '@tauri-apps/api/core'
+import { ref } from 'vue'
+
+export interface Settings {
+  download_path: string
+  theme: 'light' | 'dark' | 'system'
+  last_updated: string | null
+}
+
+export const useSettingsStore = defineStore('settings', () => {
+  const settings = ref<Settings>({
+    download_path: '',
+    theme: 'system',
+    last_updated: null
+  })
+
+  const ytdlpVersion = ref('Checking...')
+  const isInitializing = ref(true)
+
+  async function loadSettings() {
+    try {
+      const s = await invoke<Settings>('get_settings')
+      settings.value = s
+      applyTheme(s.theme)
+    } catch (e) {
+      console.error("Failed to load settings", e)
+    }
+  }
+
+  async function save() {
+    try {
+      await invoke('save_settings', { settings: settings.value })
+      applyTheme(settings.value.theme)
+    } catch (e) {
+      console.error("Failed to save settings", e)
+    }
+  }
+
+  async function initYtdlp() {
+    try {
+        isInitializing.value = true
+        // check/download
+        await invoke('init_ytdlp')
+        ytdlpVersion.value = await invoke('get_ytdlp_version')
+    } catch (e) {
+        console.error(e)
+        ytdlpVersion.value = 'Error'
+    } finally {
+        isInitializing.value = false
+    }
+  }
+
+  function applyTheme(theme: string) {
+    const root = document.documentElement
+    const isDark = theme === 'dark' || (theme === 'system' && window.matchMedia('(prefers-color-scheme: dark)').matches)
+    if (isDark) {
+      root.classList.add('dark')
+    } else {
+      root.classList.remove('dark')
+    }
+  }
+
+  // Watch system preference changes if theme is system
+  window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
+      if (settings.value.theme === 'system') {
+          applyTheme('system')
+      }
+  })
+
+  return { settings, loadSettings, save, initYtdlp, ytdlpVersion, isInitializing }
+})