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require "rendertext"
require "graphics"
require "image"

--[[
This is a (useless) generic Widget interface

widgets can be queried about their size and can be paint.
that's it for now. Probably we need something more elaborate
later.
]]
Widget = {
dimen = { w = 0, h = 0},
}

function Widget:new(o)
o = o or {}
setmetatable(o, self)
self.__index = self
return o
end

function Widget:getSize()
return self.dimen
end

function Widget:paintTo(bb, x, y)
end

function Widget:free()
end

--[[
WidgetContainer is a container for another Widget
]]
WidgetContainer = Widget:new()

function WidgetContainer:free()
for _, widget in ipairs(self) do
widget:free()
end
end

--[[
CenterContainer centers its content (1 widget) within its own dimensions
]]
CenterContainer = WidgetContainer:new()

function CenterContainer:paintTo(bb, x, y)
local contentSize = self[1]:getSize()
if contentSize.w > self.dimen.w or contentSize.h > self.dimen.h then
-- throw error?
return
end
self[1]:paintTo(bb,
x + (self.dimen.w - contentSize.w)/2,
y + (self.dimen.h - contentSize.h)/2)
end

--[[
A FrameContainer is some graphics content (1 widget) that is surrounded by a frame
]]
FrameContainer = WidgetContainer:new({
background = nil,
color = 15,
margin = 0,
bordersize = 2,
padding = 5,
})

function FrameContainer:getSize()
local content_size = self[1]:getSize()
return {
w = content_size.w + ( self.margin + self.bordersize + self.padding ) * 2,
h = content_size.h + ( self.margin + self.bordersize + self.padding ) * 2
}
end

function FrameContainer:paintTo(bb, x, y)
local my_size = self:getSize()

if self.background then
bb:paintRect(x, y, my_size.w, my_size.h, self.background)
end
if self.bordersize > 0 then
bb:paintBorder(x + self.margin, y + self.margin,
my_size.w - self.margin * 2, my_size.h - self.margin * 2,
self.bordersize, self.color)
end
self[1]:paintTo(bb,
x + self.margin + self.bordersize + self.padding,
y + self.margin + self.bordersize + self.padding)
end

--[[
A TextWidget puts a string on a single line
]]
TextWidget = Widget:new({
text = nil,
face = nil,
color = 15,
_bb = nil,
_length = 0,
_maxlength = 1200,
})

function TextWidget:_render()
local h = self.face.size * 1.5
self._bb = Blitbuffer.new(self._maxlength, h)
self._length = renderUtf8Text(self._bb, 0, h*.7, self.face, self.text, self.color)
end

function TextWidget:getSize()
if not self._bb then
self:_render()
end
return { w = self._length, h = self._bb:getHeight() }
end

function TextWidget:paintTo(bb, x, y)
if not self._bb then
self:_render()
end
bb:blitFrom(self._bb, x, y, 0, 0, self._length, self._bb:getHeight())
end

function TextWidget:free()
if self._bb then
self._bb:free()
self._bb = nil
end
end

--[[
ImageWidget shows an image from a file
]]
ImageWidget = Widget:new({
file = nil,
_bb = nil
})

function ImageWidget:_render()
local itype = string.lower(string.match(self.file, ".+%.([^.]+)") or "")
if itype == "jpeg" or itype == "jpg" then
self._bb = Image.fromJPEG(self.file)
elseif itype == "png" then
self._bb = Image.fromPNG(self.file)
end
end

function ImageWidget:getSize()
if not self._bb then
self:_render()
end
return { w = self._bb:getWidth(), h = self._bb:getHeight() }
end

function ImageWidget:paintTo(bb, x, y)
local size = self:getSize()
bb:blitFrom(self._bb, x, y, 0, 0, size.w, size.h)
end

function ImageWidget:free()
if self._bb then
self._bb:free()
self._bb = nil
end
end

--[[
A Layout widget that puts objects besides each others
]]
HorizontalGroup = WidgetContainer:new({
align = "center",
_size = nil,
})

function HorizontalGroup:getSize()
if not self._size then
self._size = { w = 0, h = 0 }
self._offsets = { }
for i, widget in ipairs(self) do
local w_size = widget:getSize()
self._offsets[i] = {
x = self._size.w,
y = w_size.h
}
self._size.w = self._size.w + w_size.w
if w_size.h > self._size.h then
self._size.h = w_size.h
end
end
end
return self._size
end

function HorizontalGroup:paintTo(bb, x, y)
local size = self:getSize()

for i, widget in ipairs(self) do
if self.align == "center" then
widget:paintTo(bb, x + self._offsets[i].x, y + (size.h - self._offsets[i].y) / 2)
elseif self.align == "top" then
widget:paintTo(bb, x + self._offsets[i].x, y)
elseif self.align == "bottom" then
widget:paintTo(bb, x + self._offsets[i].x, y + size.h - self._offsets[i].y)
end
end
end

function HorizontalGroup:free()
self._size = nil
self._offsets = {}
WidgetContainer.free(self)
end

--[[
A Layout widget that puts objects under each other
]]
VerticalGroup = WidgetContainer:new({
align = "center",
_size = nil,
_offsets = {}
})

function VerticalGroup:getSize()
if not self._size then
self._size = { w = 0, h = 0 }
self._offsets = { }
for i, widget in ipairs(self) do
local w_size = widget:getSize()
self._offsets[i] = {
x = w_size.w,
y = self._size.h,
}
self._size.h = self._size.h + w_size.h
if w_size.w > self._size.w then
self._size.w = w_size.w
end
end
end
return self._size
end

function VerticalGroup:paintTo(bb, x, y)
local size = self:getSize()

for i, widget in ipairs(self) do
if self.align == "center" then
widget:paintTo(bb, x + (size.w - self._offsets[i].x) / 2, y + self._offsets[i].y)
elseif self.align == "left" then
widget:paintTo(bb, x, y + self._offsets[i].y)
elseif self.align == "right" then
widget:paintTo(bb, x + size.w - self._offsets[i].x, y + self._offsets[i].y)
end
end
end

function VerticalGroup:free()
self._size = nil
self._offsets = {}
WidgetContainer.free(self)
end
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