import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'

// Mock vue-router
const mockRoute = { path: '/dashboard' }
const mockRouter = { push: vi.fn().mockResolvedValue(undefined) }

vi.mock('vue-router', () => ({
  useRoute: () => mockRoute,
  useRouter: () => mockRouter,
}))

// Mock stores
vi.mock('@/stores/controller', () => ({
  useControllerStore: () => ({
    setActive: vi.fn(),
    setGamepadCount: vi.fn(),
    isActive: false,
    gamepadCount: 0,
  }),
}))

vi.mock('@/stores/spotlight', () => ({
  useSpotlightStore: () => ({
    isOpen: false,
    close: vi.fn(),
  }),
}))

vi.mock('@/stores/cli', () => ({
  useCLIStore: () => ({
    isOpen: false,
    close: vi.fn(),
  }),
}))

vi.mock('@/stores/appLauncher', () => ({
  useAppLauncherStore: () => ({
    isOpen: false,
    close: vi.fn(),
  }),
}))

// Mock useNavSounds
vi.mock('@/composables/useNavSounds', () => ({
  playNavSound: vi.fn(),
}))

// ─── Module Export Tests ────────────────────────────────────────

describe('useControllerNav - module', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    vi.useFakeTimers()
    Object.defineProperty(navigator, 'getGamepads', {
      value: vi.fn().mockReturnValue([null, null, null, null]),
      configurable: true,
      writable: true,
    })
  })
  afterEach(() => { vi.useRealTimers() })

  it('exports useControllerNav as a function', async () => {
    const mod = await import('../useControllerNav')
    expect(typeof mod.useControllerNav).toBe('function')
  })
})

// ─── Nav Key Classification ─────────────────────────────────────

describe('useControllerNav - nav keys', () => {
  const navKeys = ['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Enter', 'Escape']

  it('classifies all arrow keys, Enter, and Escape as nav keys', () => {
    for (const key of navKeys) {
      expect(navKeys.includes(key)).toBe(true)
    }
  })

  it('rejects non-nav keys', () => {
    for (const key of ['a', 'Space', 'Tab', 'Shift', 'F1', 'Delete']) {
      expect(navKeys.includes(key)).toBe(false)
    }
  })
})

// ─── Route Pattern Tests ────────────────────────────────────────

describe('useControllerNav - route patterns', () => {
  it('recognizes detail page patterns for Escape-back behavior', () => {
    const pattern = /\/apps\/[^/]+$|\/marketplace\/[^/]+$|\/cloud\/[^/]+$/
    expect(pattern.test('/apps/bitcoin')).toBe(true)
    expect(pattern.test('/marketplace/electrs')).toBe(true)
    expect(pattern.test('/cloud/photos')).toBe(true)
    expect(pattern.test('/dashboard')).toBe(false)
    expect(pattern.test('/apps')).toBe(false)
  })

  it('recognizes all page type patterns for right-arrow targets', () => {
    expect(/^\/dashboard(\/)?$/.test('/dashboard')).toBe(true)
    expect(/^\/dashboard(\/)?$/.test('/dashboard/')).toBe(true)
    expect(/^\/dashboard\/(apps|marketplace)(\/|$)/.test('/dashboard/apps')).toBe(true)
    expect(/^\/dashboard\/(apps|marketplace)(\/|$)/.test('/dashboard/marketplace')).toBe(true)
    expect(/^\/dashboard\/cloud(\/|$)/.test('/dashboard/cloud')).toBe(true)
    expect(/^\/dashboard\/server(\/|$)/.test('/dashboard/server')).toBe(true)
    expect(/^\/dashboard\/web5(\/|$)/.test('/dashboard/web5')).toBe(true)
    expect(/^\/dashboard\/settings(\/|$)/.test('/dashboard/settings')).toBe(true)
  })
})

// ─── Focusable Element Detection ────────────────────────────────

describe('useControllerNav - focusable elements', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('finds buttons, links, and inputs as focusable', () => {
    document.body.innerHTML = `
      <div>
        <button>Click</button>
        <a href="/test">Link</a>
        <input type="text" />
        <button disabled>Disabled</button>
      </div>
    `
    const focusable = document.querySelectorAll(
      'a[href], button:not([disabled]), input:not([disabled])'
    )
    expect(focusable.length).toBe(3)
  })

  it('finds elements with tabindex as focusable', () => {
    document.body.innerHTML = `
      <div tabindex="0">Container</div>
      <div tabindex="-1">Hidden</div>
      <div>Not focusable</div>
    `
    const focusable = document.querySelectorAll('[tabindex]:not([tabindex="-1"])')
    expect(focusable.length).toBe(1)
  })

  it('finds data-controller-container as focusable', () => {
    document.body.innerHTML = `
      <div data-controller-container tabindex="0">Card 1</div>
      <div data-controller-container tabindex="0">Card 2</div>
      <div>Regular div</div>
    `
    const containers = document.querySelectorAll('[data-controller-container]')
    expect(containers.length).toBe(2)
  })

  it('excludes data-controller-ignore elements', () => {
    document.body.innerHTML = `
      <button>Visible</button>
      <button data-controller-ignore>Ignored</button>
      <div data-controller-ignore><button>Also ignored</button></div>
    `
    const all = Array.from(document.querySelectorAll<HTMLElement>('button:not([disabled])')).filter(
      el => !el.hasAttribute('data-controller-ignore') && !el.closest('[data-controller-ignore]')
    )
    expect(all.length).toBe(1)
    expect(all[0]?.textContent).toBe('Visible')
  })
})

// ─── Zone Detection ─────────────────────────────────────────────

describe('useControllerNav - zones', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('sidebar elements belong to sidebar zone', () => {
    document.body.innerHTML = `
      <div data-controller-zone="sidebar"><a href="/home">Home</a></div>
      <div data-controller-zone="main"><button>Action</button></div>
    `
    const link = document.querySelector('a')!
    const btn = document.querySelector('button')!
    expect(link.closest('[data-controller-zone="sidebar"]')).toBeTruthy()
    expect(btn.closest('[data-controller-zone="main"]')).toBeTruthy()
    expect(link.closest('[data-controller-zone="main"]')).toBeNull()
  })

  it('main elements belong to main zone', () => {
    document.body.innerHTML = `
      <div data-controller-zone="sidebar"><a href="/">Nav</a></div>
      <div data-controller-zone="main"><div data-controller-container tabindex="0"><button>Inner</button></div></div>
    `
    const inner = document.querySelector('button')!
    expect(inner.closest('[data-controller-zone="main"]')).toBeTruthy()
  })
})

// ─── Container Drill-in/Drill-out ───────────────────────────────

describe('useControllerNav - container behavior', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('container elements are identified via data-controller-container', () => {
    document.body.innerHTML = `
      <div data-controller-container tabindex="0">
        <button>Stop</button>
        <button>Launch</button>
      </div>
    `
    const container = document.querySelector('[data-controller-container]')
    expect(container).toBeTruthy()
    expect(container?.getAttribute('tabindex')).toBe('0')
  })

  it('inner buttons are found within containers', () => {
    document.body.innerHTML = `
      <div data-controller-container tabindex="0">
        <button>Stop</button>
        <button data-controller-launch-btn>Launch</button>
      </div>
    `
    const container = document.querySelector('[data-controller-container]')!
    const inner = Array.from(container.querySelectorAll<HTMLElement>('button:not([disabled])')).filter(
      el => el !== container
    )
    expect(inner.length).toBe(2)
  })

  it('isInsideContainer detects when element is nested in a container', () => {
    document.body.innerHTML = `
      <div data-controller-container tabindex="0">
        <button id="inner">Action</button>
      </div>
      <button id="outer">Outside</button>
    `
    const inner = document.getElementById('inner')!
    const outer = document.getElementById('outer')!
    const innerContainer = inner.closest('[data-controller-container]')

    expect(innerContainer).toBeTruthy()
    expect(innerContainer !== inner).toBe(true)
    expect(outer.closest('[data-controller-container]')).toBeNull()
  })

  it('data-controller-launch marks a card for Enter=launch behavior', () => {
    document.body.innerHTML = `
      <div data-controller-container data-controller-launch tabindex="0">
        <button data-controller-launch-btn>Launch</button>
      </div>
    `
    const container = document.querySelector('[data-controller-container]')!
    expect(container.hasAttribute('data-controller-launch')).toBe(true)
    const btn = container.querySelector('[data-controller-launch-btn]')
    expect(btn).toBeTruthy()
  })

  it('data-controller-install marks a card for Enter=install behavior', () => {
    document.body.innerHTML = `
      <div data-controller-container data-controller-install tabindex="0">
        <button data-controller-install-btn>Install</button>
      </div>
    `
    const container = document.querySelector('[data-controller-container]')!
    expect(container.hasAttribute('data-controller-install')).toBe(true)
    const btn = container.querySelector('[data-controller-install-btn]')
    expect(btn).toBeTruthy()
  })
})

// ─── Spatial Navigation (findNearestInDirection) ────────────────

describe('useControllerNav - spatial navigation logic', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('direction filtering works correctly', () => {
    // Simulate the direction check logic from findNearestInDirection
    const fromRect = { left: 200, right: 350, top: 0, bottom: 150, width: 150, height: 150 }
    const threshold = 50

    // Element to the left
    const leftRect = { left: 0, right: 150, top: 0, bottom: 150 }
    expect(leftRect.right <= fromRect.left + threshold).toBe(true)  // is to the left

    // Element to the right
    const rightRect = { left: 400, right: 550, top: 0, bottom: 150 }
    expect(rightRect.left >= fromRect.right - threshold).toBe(true) // is to the right

    // Element below
    const belowRect = { left: 200, right: 350, top: 200, bottom: 350 }
    expect(belowRect.top >= fromRect.bottom - threshold).toBe(true) // is below

    // Element above (from below position)
    expect(fromRect.bottom <= belowRect.top + threshold).toBe(true)  // fromRect is above belowRect
  })

  it('overlap scoring prefers aligned elements', () => {
    // Two elements to the right: one aligned, one offset
    const fromRect = { left: 0, right: 150, top: 50, bottom: 200, width: 150, height: 150 }

    // Aligned (same row, full overlap on Y axis)
    const alignedRect = { left: 200, right: 350, top: 50, bottom: 200, width: 150, height: 150 }
    const alignedOverlap = Math.max(0, Math.min(fromRect.bottom, alignedRect.bottom) - Math.max(fromRect.top, alignedRect.top))

    // Offset (partially overlapping on Y axis)
    const offsetRect = { left: 200, right: 350, top: 160, bottom: 310, width: 150, height: 150 }
    const offsetOverlap = Math.max(0, Math.min(fromRect.bottom, offsetRect.bottom) - Math.max(fromRect.top, offsetRect.top))

    expect(alignedOverlap).toBeGreaterThan(offsetOverlap) // aligned element wins
    expect(alignedOverlap).toBe(150) // full overlap
    expect(offsetOverlap).toBe(40)   // partial overlap
  })
})

// ─── Gamepad Detection ──────────────────────────────────────────

describe('useControllerNav - gamepad', () => {
  it('counts connected gamepads', () => {
    const gamepads = [
      { connected: true } as Gamepad,
      null,
      { connected: true } as Gamepad,
      null,
    ]
    expect(gamepads.filter(g => g?.connected).length).toBe(2)
  })

  it('handles null gamepad list', () => {
    const getCount = (gp: (Gamepad | null)[] | null): number =>
      gp ? gp.filter(g => g?.connected).length : 0
    expect(getCount(null)).toBe(0)
  })

  it('handles all-null gamepad list', () => {
    const gamepads: (Gamepad | null)[] = [null, null, null, null]
    expect(Array.from(gamepads).filter(g => g?.connected).length).toBe(0)
  })
})

// ─── Sidebar Navigation ─────────────────────────────────────────

describe('useControllerNav - sidebar behavior', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('sidebar has linear up/down navigation with wrap', () => {
    document.body.innerHTML = `
      <div data-controller-zone="sidebar">
        <a href="/dashboard" class="nav-tab-active">Home</a>
        <a href="/dashboard/apps">Apps</a>
        <a href="/dashboard/cloud">Cloud</a>
        <button>Logout</button>
      </div>
    `
    const items = document.querySelectorAll('[data-controller-zone="sidebar"] a, [data-controller-zone="sidebar"] button')
    expect(items.length).toBe(4)

    // Wrap: last→first
    const lastIdx = items.length - 1
    const nextIdx = lastIdx >= items.length - 1 ? 0 : lastIdx + 1
    expect(nextIdx).toBe(0) // wraps to Home

    // Wrap: first→last
    const firstIdx = 0
    const prevIdx = firstIdx <= 0 ? items.length - 1 : firstIdx - 1
    expect(prevIdx).toBe(3) // wraps to Logout
  })

  it('left arrow from main goes to active sidebar tab', () => {
    document.body.innerHTML = `
      <div data-controller-zone="sidebar">
        <a href="/dashboard">Home</a>
        <a href="/dashboard/apps" class="nav-tab-active">Apps</a>
      </div>
      <div data-controller-zone="main">
        <button id="mainBtn">Action</button>
      </div>
    `
    const activeTab = document.querySelector('.nav-tab-active')
    expect(activeTab).toBeTruthy()
    expect(activeTab?.textContent).toBe('Apps')
  })
})

// ─── Auto-focus Behavior ─────────────────────────────────────────

describe('useControllerNav - auto-focus', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('first container in main zone is the auto-focus target', () => {
    document.body.innerHTML = `
      <div data-controller-zone="main">
        <div data-controller-container tabindex="0" id="first">Card 1</div>
        <div data-controller-container tabindex="0" id="second">Card 2</div>
      </div>
    `
    const mainZone = document.querySelector('[data-controller-zone="main"]')
    const firstContainer = mainZone?.querySelector<HTMLElement>('[data-controller-container]')
    expect(firstContainer?.id).toBe('first')
  })

  it('does not auto-focus when input is active', () => {
    document.body.innerHTML = `
      <input id="search" type="text" />
      <div data-controller-zone="main">
        <div data-controller-container tabindex="0">Card</div>
      </div>
    `
    const input = document.getElementById('search') as HTMLInputElement
    input.focus()
    // Auto-focus should skip when input is active
    expect(document.activeElement?.tagName).toBe('INPUT')
  })
})

// ─── Tab Roving Behavior ─────────────────────────────────────────

describe('useControllerNav - tab roving', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('role="tab" elements are found as siblings within tablist', () => {
    document.body.innerHTML = `
      <div role="tablist">
        <button role="tab" id="tab1">Dashboard</button>
        <button role="tab" id="tab2">Setup</button>
      </div>
    `
    const tabs = document.querySelectorAll('[role="tab"]')
    expect(tabs.length).toBe(2)
    const tablist = tabs[0]?.closest('[role="tablist"]')
    expect(tablist).toBeTruthy()
  })

  it('tab roving cycles right: first → second → first', () => {
    const tabs = ['tab1', 'tab2']
    // Right from index 0
    expect((0 + 1) % tabs.length).toBe(1)
    // Right from index 1 (wraps)
    expect((1 + 1) % tabs.length).toBe(0)
  })

  it('tab roving cycles left: second → first → second', () => {
    const tabs = ['tab1', 'tab2']
    // Left from index 1
    expect((1 - 1 + tabs.length) % tabs.length).toBe(0)
    // Left from index 0 (wraps)
    expect((0 - 1 + tabs.length) % tabs.length).toBe(1)
  })

  it('tab roving falls back to parent when no role="tablist" wrapper', () => {
    document.body.innerHTML = `
      <div class="mode-switcher">
        <button role="tab" id="tab1">Dashboard</button>
        <button role="tab" id="tab2">Setup</button>
      </div>
    `
    const tab = document.getElementById('tab1')!
    // No role="tablist" — falls back to parentElement
    const tablist = tab.closest('[role="tablist"]') ?? tab.parentElement
    expect(tablist).toBeTruthy()
    const tabs = tablist!.querySelectorAll('[role="tab"]:not([disabled])')
    expect(tabs.length).toBe(2)
  })
})

// ─── Scroll Behavior ──────────────────────────────────────────────

describe('useControllerNav - scroll helpers', () => {
  it('focused elements have scrollIntoView method', () => {
    document.body.innerHTML = `
      <div data-controller-zone="main">
        <div data-controller-container tabindex="0">Card 1</div>
      </div>
    `
    const card = document.querySelector('[data-controller-container]') as HTMLElement
    // jsdom provides scrollIntoView as a no-op
    expect(card).toBeTruthy()
    expect(card.focus).toBeDefined()
  })
})

// ─── Container Grid Navigation ────────────────────────────────────

describe('useControllerNav - grid navigation patterns', () => {
  afterEach(() => { document.body.innerHTML = '' })

  it('marketplace 3-column grid has correct spatial relationships', () => {
    // Simulate a 3-column grid (like marketplace)
    document.body.innerHTML = `
      <div data-controller-zone="main">
        <div data-controller-container tabindex="0" id="c1" style="position:absolute;left:0;top:0;width:200px;height:200px">App 1</div>
        <div data-controller-container tabindex="0" id="c2" style="position:absolute;left:220px;top:0;width:200px;height:200px">App 2</div>
        <div data-controller-container tabindex="0" id="c3" style="position:absolute;left:440px;top:0;width:200px;height:200px">App 3</div>
        <div data-controller-container tabindex="0" id="c4" style="position:absolute;left:0;top:220px;width:200px;height:200px">App 4</div>
        <div data-controller-container tabindex="0" id="c5" style="position:absolute;left:220px;top:220px;width:200px;height:200px">App 5</div>
        <div data-controller-container tabindex="0" id="c6" style="position:absolute;left:440px;top:220px;width:200px;height:200px">App 6</div>
      </div>
    `
    const containers = document.querySelectorAll('[data-controller-container]')
    expect(containers.length).toBe(6)
    // Row 1: c1, c2, c3; Row 2: c4, c5, c6
    expect(containers[0]?.id).toBe('c1')
    expect(containers[3]?.id).toBe('c4')
  })

  it('home 2-column grid has correct container count', () => {
    document.body.innerHTML = `
      <div data-controller-zone="main">
        <div data-controller-container tabindex="0">My Apps</div>
        <div data-controller-container tabindex="0">Wallet</div>
        <div data-controller-container tabindex="0">System</div>
      </div>
    `
    const containers = document.querySelectorAll('[data-controller-container]')
    expect(containers.length).toBe(3)
  })
})