---------------------------------------------------------------------------
--
--
--
--![Usage example](../images/AUTOGEN_wibox_widget_defaults_textbox.svg)
--
-- @usage
-- wibox.widget{
--     markup = 'This <i>is</i> a <b>textbox</b>!!!',
--     align  = 'center',
--     valign = 'center',
--     widget = wibox.widget.textbox
-- }
-- @author Uli Schlachter
-- @author dodo
-- @copyright 2010, 2011 Uli Schlachter, dodo
-- @classmod wibox.widget.textbox
---------------------------------------------------------------------------

local base = require("wibox.widget.base")
local gdebug = require("gears.debug")
local beautiful = require("beautiful")
local lgi = require("lgi")
local gtable = require("gears.table")
local Pango = lgi.Pango
local PangoCairo = lgi.PangoCairo
local setmetatable = setmetatable

local textbox = { mt = {} }

--- The textbox font.
-- @beautiful beautiful.font

--- Set the DPI of a Pango layout
local function setup_dpi(box, dpi)
    assert(dpi, "No DPI provided")
    if box._private.dpi ~= dpi then
        box._private.dpi = dpi
        box._private.ctx:set_resolution(dpi)
        box._private.layout:context_changed()
    end
end

--- Setup a pango layout for the given textbox and dpi
local function setup_layout(box, width, height, dpi)
    box._private.layout.width = Pango.units_from_double(width)
    box._private.layout.height = Pango.units_from_double(height)
    setup_dpi(box, dpi)
end

-- Draw the given textbox on the given cairo context in the given geometry
function textbox:draw(context, cr, width, height)
    setup_layout(self, width, height, context.dpi)
    cr:update_layout(self._private.layout)
    local _, logical = self._private.layout:get_pixel_extents()
    local offset = 0
    if self._private.valign == "center" then
        offset = (height - logical.height) / 2
    elseif self._private.valign == "bottom" then
        offset = height - logical.height
    end
    cr:move_to(0, offset)
    cr:show_layout(self._private.layout)
end

local function do_fit_return(self)
    local _, logical = self._private.layout:get_pixel_extents()
    if logical.width == 0 or logical.height == 0 then
        return 0, 0
    end
    return logical.width, logical.height
end

-- Fit the given textbox
function textbox:fit(context, width, height)
    setup_layout(self, width, height, context.dpi)
    return do_fit_return(self)
end

--- Get the preferred size of a textbox.
-- This returns the size that the textbox would use if infinite space were
-- available.
-- @tparam integer|screen s The screen on which the textbox will be displayed.
-- @treturn number The preferred width.
-- @treturn number The preferred height.
function textbox:get_preferred_size(s)
    local dpi
    if s then
        dpi = screen[s].dpi
    else
        gdebug.deprecate("textbox:get_preferred_size() requires a screen argument", {deprecated_in=5, raw=true})
        dpi = beautiful.xresources.get_dpi()
    end

    return self:get_preferred_size_at_dpi(dpi)
end

--- Get the preferred height of a textbox at a given width.
-- This returns the height that the textbox would use when it is limited to the
-- given width.
-- @tparam number width The available width.
-- @tparam integer|screen s The screen on which the textbox will be displayed.
-- @treturn number The needed height.
function textbox:get_height_for_width(width, s)
    local dpi
    if s then
        dpi = screen[s].dpi
    else
        gdebug.deprecate("textbox:get_preferred_size() requires a screen argument", {deprecated_in=5, raw=true})
        dpi = beautiful.xresources.get_dpi()
    end
    return self:get_height_for_width_at_dpi(width, dpi)
end

--- Get the preferred size of a textbox.
-- This returns the size that the textbox would use if infinite space were
-- available.
-- @tparam number dpi The DPI value to render at.
-- @treturn number The preferred width.
-- @treturn number The preferred height.
function textbox:get_preferred_size_at_dpi(dpi)
    local max_lines = 2^20
    setup_dpi(self, dpi)
    self._private.layout.width = -1 -- no width set
    self._private.layout.height = -max_lines -- show this many lines per paragraph
    return do_fit_return(self)
end

--- Get the preferred height of a textbox at a given width.
-- This returns the height that the textbox would use when it is limited to the
-- given width.
-- @tparam number width The available width.
-- @tparam number dpi The DPI value to render at.
-- @treturn number The needed height.
function textbox:get_height_for_width_at_dpi(width, dpi)
    local max_lines = 2^20
    setup_dpi(self, dpi)
    self._private.layout.width = Pango.units_from_double(width)
    self._private.layout.height = -max_lines -- show this many lines per paragraph
    local _, h = do_fit_return(self)
    return h
end

--- Set the text of the textbox (with
-- [Pango markup](https://developer.gnome.org/pango/stable/PangoMarkupFormat.html)).
-- @tparam string text The text to set. This can contain pango markup (e.g.
--   `<b>bold</b>`). You can use `gears.string.escape` to escape
--   parts of it.
-- @treturn[1] boolean true
-- @treturn[2] boolean false
-- @treturn[2] string Error message explaining why the markup was invalid.
function textbox:set_markup_silently(text)
    if self._private.markup == text then
        return true
    end

    local attr, parsed = Pango.parse_markup(text, -1, 0)
    -- In case of error, attr is false and parsed is a GLib.Error instance.
    if not attr then
        return false, parsed.message or tostring(parsed)
    end

    self._private.markup = text
    self._private.layout.text = parsed
    self._private.layout.attributes = attr
    self:emit_signal("widget::redraw_needed")
    self:emit_signal("widget::layout_changed")
    return true
end

--- Set the text of the textbox (with
-- [Pango markup](https://developer.gnome.org/pango/stable/PangoMarkupFormat.html)).
-- @property markup
-- @tparam string text The text to set. This can contain pango markup (e.g.
--   `<b>bold</b>`). You can use `gears.string.escape` to escape
--   parts of it.
-- @see text

function textbox:set_markup(text)
    local success, message = self:set_markup_silently(text)
    if not success then
        gdebug.print_error(message)
    end
end

function textbox:get_markup()
    return self._private.markup
end

--- Set a textbox' text.
-- @property text
-- @param text The text to display. Pango markup is ignored and shown as-is.
-- @see markup

function textbox:set_text(text)
    if self._private.layout.text == text and self._private.layout.attributes == nil then
        return
    end
    self._private.markup = nil
    self._private.layout.text = text
    self._private.layout.attributes = nil
    self:emit_signal("widget::redraw_needed")
    self:emit_signal("widget::layout_changed")
end

function textbox:get_text()
    return self._private.layout.text
end

--- Set a textbox' ellipsize mode.
-- @property ellipsize
-- @param mode Where should long lines be shortened? "start", "middle" or "end"

function textbox:set_ellipsize(mode)
    local allowed = { none = "NONE", start = "START", middle = "MIDDLE", ["end"] = "END" }
    if allowed[mode] then
        if self._private.layout:get_ellipsize() == allowed[mode] then
            return
        end
        self._private.layout:set_ellipsize(allowed[mode])
        self:emit_signal("widget::redraw_needed")
        self:emit_signal("widget::layout_changed")
    end
end

--- Set a textbox' wrap mode.
-- @property wrap
-- @param mode Where to wrap? After "word", "char" or "word_char"

function textbox:set_wrap(mode)
    local allowed = { word = "WORD", char = "CHAR", word_char = "WORD_CHAR" }
    if allowed[mode] then
        if self._private.layout:get_wrap() == allowed[mode] then
            return
        end
        self._private.layout:set_wrap(allowed[mode])
        self:emit_signal("widget::redraw_needed")
        self:emit_signal("widget::layout_changed")
    end
end

--- The textbox' vertical alignment
-- @property valign
-- @param mode Where should the textbox be drawn? "top", "center" or "bottom"

function textbox:set_valign(mode)
    local allowed = { top = true, center = true, bottom = true }
    if allowed[mode] then
        if self._private.valign == mode then
            return
        end
        self._private.valign = mode
        self:emit_signal("widget::redraw_needed")
        self:emit_signal("widget::layout_changed")
    end
end

--- Set a textbox' horizontal alignment.
-- @property align
-- @param mode Where should the textbox be drawn? "left", "center" or "right"

function textbox:set_align(mode)
    local allowed = { left = "LEFT", center = "CENTER", right = "RIGHT" }
    if allowed[mode] then
        if self._private.layout:get_alignment() == allowed[mode] then
            return
        end
        self._private.layout:set_alignment(allowed[mode])
        self:emit_signal("widget::redraw_needed")
        self:emit_signal("widget::layout_changed")
    end
end

--- Set a textbox' font
-- @property font
-- @param font The font description as string

function textbox:set_font(font)
    self._private.layout:set_font_description(beautiful.get_font(font))
    self:emit_signal("widget::redraw_needed")
    self:emit_signal("widget::layout_changed")
end

--- Create a new textbox.
-- @tparam[opt=""] string text The textbox content
-- @tparam[opt=false] boolean ignore_markup Ignore the pango/HTML markup
-- @treturn table A new textbox widget
-- @function wibox.widget.textbox
local function new(text, ignore_markup)
    local ret = base.make_widget(nil, nil, {enable_properties = true})

    gtable.crush(ret, textbox, true)

    ret._private.dpi = -1
    ret._private.ctx = PangoCairo.font_map_get_default():create_context()
    ret._private.layout = Pango.Layout.new(ret._private.ctx)

    ret:set_ellipsize("end")
    ret:set_wrap("word_char")
    ret:set_valign("center")
    ret:set_align("left")
    ret:set_font(beautiful and beautiful.font)

    if text then
        if ignore_markup then
            ret:set_text(text)
        else
            ret:set_markup(text)
        end
    end

    return ret
end

function textbox.mt.__call(_, ...)
    return new(...)
end

--
--- Get a widget index.
-- @param widget The widget to look for
-- @param[opt] recursive Also check sub-widgets
-- @param[opt] ... Additional widgets to add at the end of the path
-- @return The index
-- @return The parent layout
-- @return The path between self and widget
-- @function index

--- Get all direct and indirect children widgets.
-- This will scan all containers recursively to find widgets
-- Warning: This method it prone to stack overflow id the widget, or any of its
-- children, contain (directly or indirectly) itself.
-- @treturn table The children
-- @function get_all_children

--- Set a declarative widget hierarchy description.
-- See [The declarative layout system](../documentation/03-declarative-layout.md.html)
-- @param args An array containing the widgets disposition
-- @function setup

--- Force a widget height.
-- @property forced_height
-- @tparam number|nil height The height (`nil` for automatic)

--- Force a widget width.
-- @property forced_width
-- @tparam number|nil width The width (`nil` for automatic)

--- The widget opacity (transparency).
-- @property opacity
-- @tparam[opt=1] number opacity The opacity (between 0 and 1)

--- The widget visibility.
-- @property visible
-- @param boolean

--- Set/get a widget's buttons.
-- @param _buttons The table of buttons that should bind to the widget.
-- @function buttons

--- Emit a signal and ensure all parent widgets in the hierarchies also
-- forward the signal. This is useful to track signals when there is a dynamic
-- set of containers and layouts wrapping the widget.
-- @tparam string signal_name
-- @param ... Other arguments
-- @function emit_signal_recursive

--- When the layout (size) change.
-- This signal is emitted when the previous results of `:layout()` and `:fit()`
-- are no longer valid.  Unless this signal is emitted, `:layout()` and `:fit()`
-- must return the same result when called with the same arguments.
-- @signal widget::layout_changed
-- @see widget::redraw_needed

--- When the widget content changed.
-- This signal is emitted when the content of the widget changes. The widget will
-- be redrawn, it is not re-layouted. Put differently, it is assumed that
-- `:layout()` and `:fit()` would still return the same results as before.
-- @signal widget::redraw_needed
-- @see widget::layout_changed

--- When a mouse button is pressed over the widget.
-- @signal button::press
-- @tparam number lx The horizontal position relative to the (0,0) position in
-- the widget.
-- @tparam number ly The vertical position relative to the (0,0) position in the
-- widget.
-- @tparam number button The button number.
-- @tparam table mods The modifiers (mod4, mod1 (alt), Control, Shift)
-- @tparam table find_widgets_result The entry from the result of
-- @{wibox.drawable:find_widgets} for the position that the mouse hit.
-- @tparam wibox.drawable find_widgets_result.drawable The drawable containing
-- the widget.
-- @tparam widget find_widgets_result.widget The widget being displayed.
-- @tparam wibox.hierarchy find_widgets_result.hierarchy The hierarchy
-- managing the widget's geometry.
-- @tparam number find_widgets_result.x An approximation of the X position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.y An approximation of the Y position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.width An approximation of the width that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.height An approximation of the height that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.widget_width The exact width of the widget
-- in its local coordinate system.
-- @tparam number find_widgets_result.widget_height The exact height of the widget
-- in its local coordinate system.
-- @see mouse

--- When a mouse button is released over the widget.
-- @signal button::release
-- @tparam number lx The horizontal position relative to the (0,0) position in
-- the widget.
-- @tparam number ly The vertical position relative to the (0,0) position in the
-- widget.
-- @tparam number button The button number.
-- @tparam table mods The modifiers (mod4, mod1 (alt), Control, Shift)
-- @tparam table find_widgets_result The entry from the result of
-- @{wibox.drawable:find_widgets} for the position that the mouse hit.
-- @tparam wibox.drawable find_widgets_result.drawable The drawable containing
-- the widget.
-- @tparam widget find_widgets_result.widget The widget being displayed.
-- @tparam wibox.hierarchy find_widgets_result.hierarchy The hierarchy
-- managing the widget's geometry.
-- @tparam number find_widgets_result.x An approximation of the X position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.y An approximation of the Y position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.width An approximation of the width that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.height An approximation of the height that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.widget_width The exact width of the widget
-- in its local coordinate system.
-- @tparam number find_widgets_result.widget_height The exact height of the widget
-- in its local coordinate system.
-- @see mouse

--- When the mouse enter a widget.
-- @signal mouse::enter
-- @tparam table find_widgets_result The entry from the result of
-- @{wibox.drawable:find_widgets} for the position that the mouse hit.
-- @tparam wibox.drawable find_widgets_result.drawable The drawable containing
-- the widget.
-- @tparam widget find_widgets_result.widget The widget being displayed.
-- @tparam wibox.hierarchy find_widgets_result.hierarchy The hierarchy
-- managing the widget's geometry.
-- @tparam number find_widgets_result.x An approximation of the X position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.y An approximation of the Y position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.width An approximation of the width that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.height An approximation of the height that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.widget_width The exact width of the widget
-- in its local coordinate system.
-- @tparam number find_widgets_result.widget_height The exact height of the widget
-- in its local coordinate system.
-- @see mouse

--- When the mouse leave a widget.
-- @signal mouse::leave
-- @tparam table find_widgets_result The entry from the result of
-- @{wibox.drawable:find_widgets} for the position that the mouse hit.
-- @tparam wibox.drawable find_widgets_result.drawable The drawable containing
-- the widget.
-- @tparam widget find_widgets_result.widget The widget being displayed.
-- @tparam wibox.hierarchy find_widgets_result.hierarchy The hierarchy
-- managing the widget's geometry.
-- @tparam number find_widgets_result.x An approximation of the X position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.y An approximation of the Y position that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.width An approximation of the width that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.height An approximation of the height that
-- the widget is visible at on the surface.
-- @tparam number find_widgets_result.widget_width The exact width of the widget
-- in its local coordinate system.
-- @tparam number find_widgets_result.widget_height The exact height of the widget
-- in its local coordinate system.
-- @see mouse

--
--- Disconnect from a signal.
-- @tparam string name The name of the signal.
-- @tparam function func The callback that should be disconnected.
-- @function disconnect_signal

--- Emit a signal.
--
-- @tparam string name The name of the signal.
-- @param ... Extra arguments for the callback functions. Each connected
--   function receives the object as first argument and then any extra
--   arguments that are given to emit_signal().
-- @function emit_signal

--- Connect to a signal.
-- @tparam string name The name of the signal.
-- @tparam function func The callback to call when the signal is emitted.
-- @function connect_signal

--- Connect to a signal weakly.
--
-- This allows the callback function to be garbage collected and
-- automatically disconnects the signal when that happens.
--
-- **Warning:**
-- Only use this function if you really, really, really know what you
-- are doing.
-- @tparam string name The name of the signal.
-- @tparam function func The callback to call when the signal is emitted.
-- @function weak_connect_signal

return setmetatable(textbox, textbox.mt)

-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
