-- File: zoom._hs
-- Purpose: Zoom control helper functions
-- Last Updated: 2025-11-30

-- ==============================================================================
-- ZOOM SLIDER INPUT HANDLER
-- ==============================================================================
-- Called from zoom-slider input event to update zoom level
def handleZoomInput(slider)
  set zoomValue to slider.value as a Number
  set zoomLevel to zoomValue / 100

  -- Update display
  set valueEl to #zoom-value-current
  if valueEl is not null
    put zoomValue into valueEl
  end
  set slider's @aria-valuenow to zoomValue
  set slider's @aria-valuetext to `${zoomValue}%`

  -- Toggle reset button class
  set resetBtn to #zoom-reset
  if resetBtn is not null
    if zoomValue is not 100
      add .zoom-not-default to resetBtn
    else
      remove .zoom-not-default from resetBtn
    end
  end

  -- Apply zoom to wrapper
  set wrapper to #zoom-wrapper
  if wrapper is not null
    set wrapper's *zoom to zoomLevel
    -- Handle width for zoom > 100%
    if zoomLevel > 1
      set wrapper's *width to 'auto'
      set wrapper's *minWidth to '100%'
      set wrapper's *maxWidth to 'none'
    else
      set wrapper's *width to ''
      set wrapper's *minWidth to ''
      set wrapper's *maxWidth to ''
    end
  end

  -- Save to localStorage
  set localStorage['cv-zoom'] to zoomValue
end

-- ==============================================================================
-- ZOOM RESET HANDLER
-- ==============================================================================
-- Called from reset button to reset zoom to 100%
def handleZoomReset()
  set slider to #zoom-slider
  if slider is not null
    set slider.value to 100
    call handleZoomInput(slider)
    call slider.focus()
  end
end

-- ==============================================================================
-- ZOOM CONTROL VISIBILITY
-- ==============================================================================
-- Initialize zoom control visibility on load
def initZoomControl(control)
  -- Skip on mobile
  if window.innerWidth <= 768
    exit
  end

  -- Load saved zoom level
  set savedZoom to localStorage.getItem('cv-zoom')
  set slider to #zoom-slider
  if savedZoom and slider
    set slider.value to savedZoom
    call handleZoomInput(slider)
  end

  -- Check visibility preference
  set isVisible to localStorage.getItem('cv-zoom-visible')
  if isVisible is 'true'
    remove .zoom-hidden from control
    set menuBtn to #show-zoom-menu-btn
    if menuBtn is not null
      add .zoom-hidden to menuBtn
    end
  end

  -- Load saved position
  set savedPos to localStorage.getItem('cv-zoom-position')
  if savedPos
    set pos to JSON.parse(savedPos)
    set control's *bottom to pos.bottom
    set control's *left to pos.left
    set control's *transform to 'none'
  end
end

-- ==============================================================================
-- ZOOM VISIBILITY HANDLERS
-- ==============================================================================
-- Show zoom control
def showZoomControl()
  set control to #zoom-control
  set menuBtn to #show-zoom-menu-btn
  if control is not null
    remove .zoom-hidden from control
    set localStorage['cv-zoom-visible'] to 'true'
  end
  if menuBtn is not null
    add .zoom-hidden to menuBtn
  end
end

-- Hide zoom control
def hideZoomControl()
  set control to #zoom-control
  set menuBtn to #show-zoom-menu-btn
  if control is not null
    add .zoom-hidden to control
    set localStorage['cv-zoom-visible'] to 'false'
  end
  if menuBtn is not null
    remove .zoom-hidden from menuBtn
  end
end

-- Toggle zoom control visibility
def toggleZoomControl()
  set control to #zoom-control
  if control is not null
    if control.classList.contains('zoom-hidden')
      call showZoomControl()
    else
      call hideZoomControl()
    end
  end
end

-- ==============================================================================
-- ZOOM CONTROL DRAG HANDLERS
-- ==============================================================================
-- Check if drag target is valid (not a button or input)
def isZoomDragTarget(el)
  if el.tagName is 'INPUT'
    return false
  end
  if el.tagName is 'BUTTON'
    return false
  end
  if el.matches('.zoom-slider, .zoom-close-btn, .zoom-reset-btn, .zoom-value')
    return false
  end
  if el.closest('.zoom-close-btn')
    return false
  end
  if el.closest('.zoom-reset-btn')
    return false
  end
  return true
end

-- Start dragging zoom control
def startZoomDrag(control, clientX, clientY)
  set control._isDragging to true
  set control's *transition to 'none'
  set rect to control.getBoundingClientRect()
  set control._initialX to clientX - rect.left
  set control._initialY to clientY - rect.top
end

-- Handle drag move
def moveZoomDrag(control, clientX, clientY)
  if control._isDragging is not true
    return false
  end
  set currentX to clientX - control._initialX
  set currentY to clientY - control._initialY
  set maxX to window.innerWidth - control.offsetWidth
  set maxY to window.innerHeight - control.offsetHeight
  set currentX to Math.max(0, Math.min(currentX, maxX))
  set currentY to Math.max(0, Math.min(currentY, maxY))
  set control's *left to `${currentX}px`
  set control's *bottom to `${window.innerHeight - currentY - control.offsetHeight}px`
  set control's *transform to 'none'
  return true
end

-- End drag and save position
def endZoomDrag(control)
  if control._isDragging is not true
    return false
  end
  set control._isDragging to false
  set control's *transition to 'all 0.3s ease'
  set position to { bottom: control.style.bottom, left: control.style.left }
  set localStorage['cv-zoom-position'] to JSON.stringify(position)
  return true
end