import { describe, it, expect, beforeEach } from 'vitest'
import { AppStore } from '../../../src/lib/stores/app.svelte.js'

describe('AppStore', () => {
  let app

  beforeEach(() => {
    app = new AppStore()
  })

  it('initializes with default state', () => {
    expect(app.locations).toEqual([])
    expect(app.selectedLocationId).toBeNull()
    expect(app.forecastData).toBeNull()
    expect(app.loading).toBe(false)
    expect(app.error).toBe('')
    expect(app.showAddLocation).toBe(false)
    expect(app.showSettings).toBe(false)
    expect(app.sidebarOpen).toBe(false)
  })

  it('has default settings', () => {
    expect(app.settings.units).toBe('metric')
    expect(app.settings.alertsEnabled).toBe(true)
  })

  it('selectedLocation is derived correctly', () => {
    expect(app.selectedLocation).toBeNull()

    // Set up locations manually
    app.locations = [
      { id: 'loc1', name: 'Berlin', lat: 52.52, lon: 13.41, isCurrent: false, order: 1 },
    ]
    app.selectedLocationId = 'loc1'

    expect(app.selectedLocation).toBeTruthy()
    expect(app.selectedLocation.name).toBe('Berlin')
  })

  it('selectedLocation returns null when id not found', () => {
    app.locations = [{ id: 'loc1', name: 'Berlin', lat: 52.52, lon: 13.41, isCurrent: false, order: 1 }]
    app.selectedLocationId = 'nonexistent'

    expect(app.selectedLocation).toBeNull()
  })
})