Editing Module:Infobox

--[=[
-- For documentation, see [[Module:Infobox/doc]]
--]=]

-- <nowiki>
require('strict')
local editbutton = require('Module:Edit button')
local smwutils = require('Module:SMW Utils')

local Infobox = {}
Infobox.__index = Infobox

--[[
	Infobox class
	-- config: table containing configuration parameters
	-- params : definitions for each used value
	-- args : values passed from the Template
	---- the following values are treated specially: default_version, version, version1, version2...
--]]
function Infobox.new(config, params, args)
	local obj = setmetatable({
				args_raw = args, -- parameters (uncleaned)
				args_parsed = {}, -- parsed parameters
				args_smw = {}, -- parameters parsed for smw
				infobox_name = nil, -- template name
				classes = {}, -- list of classes to add, using the default_version
				param_names = {}, -- ordered param list
				params = {}, -- param definitions
				max_buttons = 6, -- If there are more buttons than the max, the buttons will become a dropdown menu
				default_version = 1, -- default version to populate the infobox
				versions = nil, -- number of versions
				version_names = {}, -- title of each version (for selection and SMW)
				rtable = nil, -- infobox table to return at the end
				switch_datatable = '', -- datatable for javascript for switch infoboxes
				categories = {}, -- set of categories
				errors = {}, -- list of errors
				__smw_debug = {}, -- debug data for smw subobjects
				},
			Infobox)
	-- Step 1, setup config vars and count the versions
	obj:config(config)
	obj:parse_versions()
	-- Step 2, process the params
	obj:define_params(params)
	obj:parse_params()
	-- Table
	obj:table_header()
	obj:buttons()
	-- Misc
	obj:store_smw()
	obj:parse_categories()
	return obj
end


--[[
	Refers to a param after being processed by the validating func
	Used in add_row(), define_params() and is_param_defined()
--]]
function Infobox.param(param_name)
	local param = {
		property = 'args_parsed',
		param_name = param_name,
	}
	return param
end


--[[
	Refers to a param in raw form as passed from the Template
	Used in add_row(), define_params() and is_param_defined()
--]]
function Infobox.raw_param(param_name)
	local param = {
		property = 'args_raw',
		param_name = param_name,
	}
	return param
end


--[[
	Refers to a param after being processed by the validating smw_func
	Used in add_row(), define_params() and is_param_defined()
--]]
function Infobox.smw_param(param_name)
	local param = {
		property = 'args_smw',
		param_name = param_name,
	}
	return param
end


--[[
	Checks to see if a param is defined.
	-- param: Infobox.param(name), Infobox.raw_param(name) or Infobox.smw_param(name)
	Returns 0 if param is never defined
	        1 if param is defined for a fraction of the versions
			2 if param is defined for all versions
]]
function Infobox:is_param_defined(param)
	local undefined = 0
	local defined = 0
	for version = 1, self.versions do
		local value = self:get_param(param, version)
		if value ~= nil then
			defined = 1
		else
			undefined = 1
		end
	end
	return 1 + defined - undefined
end


--[[
	Adds a row to the infobox table
	Parameter should be a table of cells, where each cell is a table with the following arguments:
	-- tag : 'td' or 'th'
	-- content : a string or Infobox.param(name), Infobox.raw_param(name), Infobox.smw_param(name)
	-- attr (optional) : mw.html:attr({ arg1 = '1', ... })
	-- css (optional) : mw.html:css({ arg1 = '1', ...)
	-- class (optional) : mw.html:addClass('arg')
	---- class also supports a table of values, even though mw.html:addClass() does not
	---- common classes: infobox-subheader
	-- rowspan (optional) : mw.html:attr('rowspan',arg)
	-- colspan (optional) : mw.html:attr('colspan',arg)
	-- title (optional) : mw.html:attr('title',arg)

	The row itself may be assigned a single class by setting the value of the key addClass
		-- addClass : mw.html:addClass('arg')
		-- this function currently only supports a single string
--]]
function Infobox:add_row(...)
	local args = ...
	local _row = self.rtable:tag('tr')
	-- For each cell
	for _, v in ipairs(args) do
		local _cell = _row:tag(v.tag)
		-- Optional parameters
		if v.attr then
			_cell:attr(v.attr)
		end
		if v.colspan then
			_cell:attr('colspan',v.colspan)
		end
		if v.rowspan then
			_cell:attr('rowspan',v.rowspan)
		end
		if v.title then
			_cell:attr('title',v.title)
		end
		if v.css then
			_cell:css(v.css)
		end
		if v.class then
			if type(v.class) == 'string' then
				_cell:addClass(v.class)
			-- mw.html:addClass() doesn't function with tables, add in a loop
			elseif type(v.class) == 'table' then
				for _, w in ipairs(v.class) do
					_cell:addClass(w)
				end
			end
		end
		-- Populate the cell contents
		local content = self:get_param(v.content, self.default_version)
		if content == nil then
			content = self.params[v.content.param_name].empty
		end
		_cell:wikitext(content)
		-- Add the switch data if multiple values exist
		local data_attr_param = self:add_switch_data(v.content)
		if data_attr_param then
			_cell:attr('data-attr-param', data_attr_param)
		end
	end
	-- allow classes to be defined on the whole row
	if args.addClass then
		_row:addClass(args.addClass)
	end
	return self
end


--[[
	Adds a blank row of padding spanning the given number of columns
--]]
function Infobox:pad(colspan, class)
	local tr = self.rtable:tag('tr'):tag('td'):attr('colspan', colspan or 1):addClass('infobox-padding')
	if class then
		tr:addClass(class)	
	end
	return self
end

--[[
	Adds a class to the table as a whole
--]]
function Infobox:addClass(arg)
	self.rtable:addClass(arg)
	return self
end


--[[
	Setup config values
	-- config: table containing configuration parameters
	---- infobox_name = mandatory unique identifier for this infobox, used for css
	---- max_buttons = max number of switch buttons before using a dropdown list instead
--]]
function Infobox:config(config)
	for k, v in pairs(config) do
		if k == 'infobox_name' then
			self.infobox_name = mw.ustring.gsub(v, '%s', '_')
		elseif k == 'max_buttons' then
			self.max_buttons = tonumber(v)
		elseif k == 'class' then
			if type(v) == 'string' then
				self.classes = {v}
			elseif type(v) == 'table' then
				self.classes = v
			end
		end
	end
	if self.infobox_name == nil then
		table.insert(self.errors, 'infobox_name needs to be defined in Infobox.new()\'s config!')
	end
	return self
end


--[[
	Counts the number of versions in the infobox
	Populates Infobox.version_names
	Sets Infobox.default_version
--]]
function Infobox:parse_versions()
	local function insert_version_name(version_name)
		table.insert(self.version_names, version_name)
		if smwutils.valid_subobject_name(version_name) == false then
			table.insert(self.errors, 'Illegal version value: must not be "0" nor contain a "." in the first five characters')
		end
	end
		
	-- Count the versions and setup self.version_names
	local i = 1
	while self.args_raw['version'..i] do
		insert_version_name(self.args_raw['version'..i])
		i = i + 1
	end
	self.versions = i - 1
	-- Should either have 0 or 2+ versions
	if self.versions == 1 then
		table.insert(self.errors, 'There should be multiple versions or no versions. If defining a custom version name for a single entry, use "version=Name" instead of "version1=Name".')
	end
	-- Handle the no version case - check for a custom version_name
	if self.versions == 0 then
		insert_version_name(self.args_raw['version'] or 'DEFAULT')
		self.versions = 1
	end
	-- Check for a default_version
	if self.args_raw['default_version'] then
		self.default_version = tonumber(self.args_raw['default_version'])
		if self.default_version > self.versions then -- Make sure the default version exists
			self.default_version = 1
		end
	end
end


--[[
	Define all used parameters (except for default_version/version)
	-- name : parameter name as used in the Template
	-- func : function to validate and process the Template argument
	--        If func is a function, will call func(Infobox.raw_param(name))
	--        If func is a table, contains the following key-value pairs:
	----          name : function
	----          params : list of arguments to pass to the function (use Infobox.raw_param(),
	----                   Infobox.param() and Infobox.smw_param() to use arguments)
	-- empty (optional) : text to display in the infobox if func returns nil, defaults to "? (edit)"
	-- category_never : category to add if func returns nil for all versions
	-- category_partial : category to add if func returns nil for some versions, but a value for other versions
	-- category_incomplete : category to add if func returns nil for at least 1 version (i.e. category_never and category_partial combined)
	-- category_complete : category to add if func returns a value for all versions
	-- smw_property (optional) : if this string is defined, the parameter will be saved into smw
	-- smw_func (optional) : function to validate and process the Template argument to save into smw
	--                      func is used by default if smw_func is not defined
--]]
function Infobox:define_params(...)
	-- For every parameter, store its corresponding function to self.params
	for _, v in ipairs(...) do
		if v.name then
			local param = {}
			-- Copy the function
			if type(v.func) == 'function' or type(v.func) == 'table' then
				param.func = v.func
			end
			-- If smw_property is defined, then use smw_func, or default to func if it is not defined
			if v.smw_property then
				param.smw_property = v.smw_property
				if type(v.smw_func) == 'function' or type(v.smw_func) == 'table' then
					param.smw_func = v.smw_func
				else
					param.smw_func = param.func
				end
			end
			-- If empty is not defined, default message is "? (edit)"
			param.empty = v.empty or editbutton("'''?''' (edit)")
			-- Get the category names
			param.category_never = v.category_never
			param.category_partial = v.category_partial
			param.category_incomplete = v.category_incomplete
			param.category_complete = v.category_complete
			-- Store the param
			self.params[v.name] = param
			table.insert(self.param_names, v.name)
		end
	end
	return self
end


--[[
	Fetches a param value. If the value is nil, will return the default value instead
	-- arg: a non-table value (string, number, etc), or Infobox.param(name), Infobox.raw_param(name), Infobox.smw_param(name)
	-- version: 0/'' for default, or else a number
	Returns arg if a constant
	        param value (or default value) if Infobox.param(name), Infobox.raw_param(name), Infobox.smw_param(name)
--]]
function Infobox:get_param(arg, version)
	if version == 0 then
		version = ''
	end
	-- Handle Infobox.param(), Infobox.raw_param(), Infobox.smw_param()
	if type(arg) == 'table' then
		local value = self[arg.property][arg.param_name..version]
		-- If nil, grab default value (which could be nil as well)
		if value == nil then
			value = self[arg.property][arg.param_name]
		end
		return value
	end
	-- Everything else passes through unmodified (string, number, etc)
	return arg
end


--[[
	Calculates the parsed value of a param
	-- param_name : param_name as a string
	-- version : 0/'' for default, or else a number
	-- smw : boolean, will use smw_func if true, or func is false
--]]
function Infobox:parse_param(param_name, version, smw)
	if version == 0 then
		version = ''
	end
	-- use func or smw_func depending on smw argument
	local param = self.params[param_name]
	local func = smw and param.smw_func or param.func
	-- call functions by passing the param_name
	if type(func) == 'function' then
		return func(self:get_param(self.raw_param(param_name), version))
	-- call tables by grabbing the function and reading the param arguments
	elseif type(func) == 'table' then
		local func_name = func.name
		local func_params = func.params
		local func_fetched_params = {}
		local i = 1
		for _, func_param in ipairs(func_params) do
			func_fetched_params[i] = self:get_param(func_param, version)
			i = i + 1
		end
		return func_name(unpack(func_fetched_params))
	else
		table.insert(self.errors, 'Invalid param definition for '..param_name)
	end
end


--[[
	Parses all the param values (args_parsed and args_smw)
--]]
function Infobox:parse_params()
	-- Calculate the param value for all params and all versions
	for _, param_name in ipairs(self.param_names) do
		for version=0, self.versions do
			if version == 0 then
				version = ''
			end
			-- get the parsed value
			self.args_parsed[param_name..version] = self:parse_param(param_name, version, false)
			-- Only get the smw value if smw_property is defined
			if self.params[param_name].smw_property then
				self.args_smw[param_name..version] = self:parse_param(param_name, version, true)
			end
		end
	end
end


--[[
	Creates the table header
--]]
function Infobox:table_header()
	-- Create infobox table
	self.rtable = mw.html.create('table')
					:addClass('plainlinks')
					:addClass('infobox')
					:addClass('infobox-'..self.infobox_name)
	for _, class in ipairs(self.classes) do
		local class_name = self:get_param(class, self.default_version)
		if type(class_name) == 'string' then
			self.rtable:addClass('infobox-'..mw.ustring.gsub(class_name, '%s', '_'))
		end
	end
	-- Create the switch datatable if multiple versions
	if self.versions > 1 then
		self.rtable:addClass('infobox-switch')
		self.switch_datatable = mw.html.create('div')
									:addClass('infobox-switch-resources')
									:addClass('infobox-resources-'..self.infobox_name)
									:addClass('hidden')
	end
	return self
end


--[[
	If multiple versions exist, creates a set of buttons for switching
	-- self.max_buttons : if the number of versions exceeds this value, a dropdown will be created instead
--]]
function Infobox:buttons()
	if self.versions < 2 then
		return
	end
	-- Button caption
	local buttons = self.rtable:tag('caption')
								:tag('div')
								:addClass('infobox-buttons')
								:attr('data-default-index', self.default_version)
	-- Dropdown list instead of buttons if too many versions
	if self.versions > self.max_buttons then
		buttons:addClass('infobox-buttons-select')
	end
	-- Create all the buttons
	for version=1, self.versions do
		local button = buttons:tag('span')
			   :attr('data-switch-index', version)
			   :attr('data-switch-anchor', '#'..self.version_names[version])
			   :addClass('button')
			   :wikitext(self.version_names[version])
	    -- In case of dropdown list, hide the buttons as the switch gadget will convert them to a dropdown list - we can't directly create the dropdown list here as the select/option tags are rejected by wikitext
		if self.versions > self.max_buttons then
			button:addClass('hidden')
		end
	end
end


--[[
	For each version, stores a subobject for all params that have smw_property defined
--]]
function Infobox:store_smw()
	for version=1, self.versions do
		-- Generate a subobject name
		-- Reminder - subobject name cannot have a . in the first 5 characters
		local subobject_name = self.version_names[version]
		-- Store each param that has smw_property defined and is not nil
		local subobject = {
			Infobox = self.infobox_name, -- Also store the current Infobox name
			['Version anchor'] = self.versions > 1 and self.version_names[version] or nil, -- Store the version anchor
		}
		for _, param_name in ipairs(self.param_names) do
			local property = self.params[param_name].smw_property
			if property then
				local value = self:get_param(self.smw_param(param_name), version)
				if value ~= nil then
					subobject[property] = value
				end
			end
		end
		-- Keep a copy for debugging
		self.__smw_debug[subobject_name] = subobject
		-- Save subobjects if not in mainspace
		if mw.title.getCurrentTitle():inNamespace(0) then
			local result = true
			if self.versions == 1 then
				result = mw.smw.set(subobject)
			else
				result = mw.smw.subobject(subobject, subobject_name)
				if version == 1 then
					result = mw.smw.set(subobject) -- write SMW parameters to the main page for the first version as well
				end
			end
			if result ~= true then
				table.insert(self.errors, 'SMW error: '..result.error)
			end
		end
	end
end


--[[
	Automatically add categories for each param as defined in define_params()
--]]
function Infobox:parse_categories()
	for _, param_name in ipairs(self.param_names) do
		local param = self.params[param_name]
		local defined = self:is_param_defined(Infobox.param(param_name))
		if defined == 0 and param.category_never then
			self.categories[param.category_never] = 1
		end
		if defined == 1 and param.category_partial then
			self.categories[param.category_partial] = 1
		end
		if defined < 2 and param.category_incomplete then
			self.categories[param.category_incomplete] = 1
		end
		if defined == 2 and param.category_complete then
			self.categories[param.category_complete] = 1
		end
	end
end


--[[
	When a parameter is added into the table, add the alternative versions' data into the switch datatable
	-- content : a non-table value (string, number, etc), or Infobox.param(name), Infobox.raw_param(name), Infobox.smw_param(name)
	Returns the name of the parameter in the tag 'data-attr-param'
--]]
function Infobox:add_switch_data(content)
	if self.versions < 2 then
		return false
	end
	-- Only needed for non-constant params
	if type(content) ~= 'table' then
		return false
	end
	-- Only needed if the param changes value between different versions
	local first_value = self:get_param(content, 1)
	local all_same = true
	for version=2, self.versions do
		if first_value ~= self:get_param(content, version) then
			all_same = false
			break
		end
	end
	if all_same then
		return false
	end
	-- Let's build the datatable
	-- datum name: Prepend raw__ or smw__ if not a parsed argument
	local name = content.param_name
	if content.property == 'args_raw' then
		name = 'raw__' + name
	end
	if content.property == 'args_smw' then
		name = 'smw__' + name
	end
	local data_param = self.switch_datatable:tag('span'):attr('data-attr-param', name)
	-- Add each version to the datatable
	for version=1, self.versions do
		local text = self:get_param(content, version)
		if text == nil then
			text = self.params[content.param_name].empty
		end
		data_param:tag('span'):attr('data-attr-index', version):wikitext(text)
	end
	-- return the 'data-attr-param' name
	return name
end


--[[
	Override tostring
--]]
function Infobox:__tostring()
	-- Create error messages
	local error_text = ''
	for _, v in ipairs(self.errors) do
		error_text = error_text..'<span class="mw-message-box-error">'..v..'</span>'
	end
	-- Create categories
	local category_text = ''
	if mw.title.getCurrentTitle():inNamespace(0) then
		for key, _ in pairs(self.categories) do
			category_text = category_text..'[[Category:'..key..']]'
		end
	end
	local dump = ''
	if self.args_raw.__dump then
		setmetatable(self, nil)
		dump = '<nowiki>'..mw.dumpObject(self)..'</nowiki>'
		setmetatable(self, Infobox)
	end
	return tostring(self.rtable) .. tostring(self.switch_datatable) .. error_text .. category_text .. dump
end


--[[
	Debug function
--]]
function Infobox:dump()
	-- Temporarily detach the metatable so we don't override tostring anymore, allowing us to use dumpObject
	setmetatable(self, nil)
	mw.log(mw.dumpObject(self))
	setmetatable(self, Infobox)
	mw.log(tostring(self))
end


return Infobox