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-- This module provides a library for formatting file wikilinks.
 
local libraryUtil = require('libraryUtil')
local checkType = libraryUtil.checkType
 
local fileLink = {}
 
function fileLink.new(filename)
	checkType('fileLink.new', 1, filename, 'string', true)
	local obj, data = {}, {}
 
	local checkSelf = libraryUtil.makeCheckSelfFunction(
		'fileLink',
		'fileLink',
		obj,
		'fileLink object'
	)
 
	-- Set the filename if we were passed it as an input to fileLink.new.
	if filename then
		data.theName = filename
	end
 
	function data:name(s)
		checkSelf(self, 'name')
		checkType('fileLink:name', 1, s, 'string')
		data.theName = s
		return self
	end
 
	function data:format(s, filename)
		checkSelf(self, 'format')
		checkType('fileLink:format', 1, s, 'string', true)
		checkType('fileLink:format', 2, format, 'string', true)
		local validFormats = {
			thumb = true,
			thumbnail = true,
			frame = true,
			framed = true,
			frameless = true
		}
		if s == nil or validFormats[s] then
			data.theFormat = s
			data.theFormatFilename = filename
		else
			error(string.format(
				"错误参数 #1 'fileLink:format'('%s'不是可用的格式)",
				s
			), 2)
		end
		return self
	end
 
	local function sizeError(methodName)
		-- Used for formatting duplication errors in size-related methods.
		error(string.format(
			"发现重复的尺寸参数'%s'"
			.. "('upright'不能用来结合长度与宽度)",
			methodName
		), 3)
	end
 
	function data:width(px)
		checkSelf(self, 'width')
		checkType('fileLink:width', 1, px, 'number', true)
		if px and data.isUpright then
			sizeError('fileLink:width')
		end
		data.theWidth = px
		return self
	end
 
	function data:height(px)
		checkSelf(self, 'height')
		checkType('fileLink:height', 1, px, 'number', true)
		if px and data.isUpright then
			sizeError('fileLink:height')
		end
		data.theHeight = px
		return self
	end
 
	function data:upright(isUpright, factor)
		checkSelf(self, 'upright')
		checkType('fileLink:upright', 1, isUpright, 'boolean', true)
		checkType('fileLink:upright', 2, factor, 'number', true)
		if isUpright and (data.theWidth or data.theHeight) then
			sizeError('fileLink:upright')
		end
		data.isUpright = isUpright
		data.uprightFactor = factor
		return self
	end
 
	function data:resetSize()
		checkSelf(self, 'resetSize')
		for i, field in ipairs{'theWidth', 'theHeight', 'isUpright', 'uprightFactor'} do
			data[field] = nil
		end
		return self
	end
 
	function data:location(s)
		checkSelf(self, 'location')
		checkType('fileLink:location', 1, s, 'string', true)
		local validLocations = {
			right = true,
			left = true,
			center = true,
			none = true
		}
		if s == nil or validLocations[s] then
			data.theLocation = s
		else
			error(string.format(
				"错误参数 #1 'fileLink:location'('%s'不是有效的地址)",
				s
			), 2)
		end
		return self
	end
 
	function data:alignment(s)
		checkSelf(self, 'alignment')
		checkType('fileLink:alignment', 1, s, 'string', true)
		local validAlignments = {
			baseline = true,
			middle = true,
			sub = true,
			super = true,
			['text-top'] = true,
			['text-bottom'] = true,
			top = true,
			bottom = true
		}
		if s == nil or validAlignments[s] then
			data.theAlignment = s
		else
			error(string.format(
				"错误参数 #1 'fileLink:alignment'('%s'不是正确的对齐方式)",
				s
			), 2)
		end
		return self
	end
 
	function data:border(hasBorder)
		checkSelf(self, 'border')
		checkType('fileLink:border', 1, hasBorder, 'boolean', true)
		data.hasBorder = hasBorder
		return self
	end
 
	function data:link(s)
		checkSelf(self, 'link')
		checkType('fileLink:link', 1, s, 'string', true)
		data.theLink = s
		return self
	end
 
	function data:alt(s)
		checkSelf(self, 'alt')
		checkType('fileLink:alt', 1, s, 'string', true)
		data.theAlt = s
		return self
	end
 
	function data:page(num)
		checkSelf(self, 'page')
		checkType('fileLink:page', 1, num, 'number', true)
		data.thePage = s
		return self
	end
 
	function data:class(s)
		checkSelf(self, 'class')
		checkType('fileLink:class', 1, s, 'string', true)
		data.theClass = s
		return self
	end
 
	function data:lang(s)
		checkSelf(self, 'lang')
		checkType('fileLink:lang', 1, s, 'string', true)
		data.theLang = s
		return self
	end
 
	local function checkTypeStringOrNum(funcName, pos, arg)
		local argType = type(arg)
		if argType ~= 'nil' and argType ~= 'string' and argType ~= 'number' then
			error(string.format(
				"错误参数 #%d '%s'(指定的字符串或数字 %s)",
				pos,
				funcName,
				argType
			), 3)
		end
	end
 
	function data:startTime(time)
		checkSelf(self, 'startTime')
		checkTypeStringOrNum('fileLink:startTime', 1, time)
		data.theStartTime = time
		return self
	end
 
	function data:endTime(time)
		checkSelf(self, 'endTime')
		checkTypeStringOrNum('fileLink:endTime', 1, time)
		data.theEndTime = time
		return self
	end
 
	function data:thumbTime(time)
		checkSelf(self, 'thumbTime')
		checkTypeStringOrNum('fileLink:thumbTime', 1, time)
		data.theThumbTime = time
		return self
	end
 
	function data:caption(s)
		checkSelf(self, 'caption')
		checkType('fileLink:caption', 1, s, 'string', true)
		data.theCaption = s
		return self
	end
 
	function data:render()
		checkSelf(self, 'render')
		local ret = {}
 
		-- Filename
		if not data.theName then
			error('fileLink:render: 找不到文件名')
		end
		ret[#ret + 1] = 'File:' .. data.theName
 
		-- Format
		if data.theFormat and data.theFormatFilename then
			ret[#ret + 1] = data.theFormat .. '=' .. data.theFormatFilename
		elseif data.theFormat then
			ret[#ret + 1] = data.theFormat
		end
 
		-- Border
		if data.hasBorder then
			ret[#ret + 1] = 'border'
		end
 
		-- Location
		ret[#ret + 1] = data.theLocation
 
		-- Alignment
		ret[#ret + 1] = data.theAlignment
 
		-- Size
		if data.isUpright and data.uprightFactor then
			ret[#ret + 1] = 'upright=' .. tostring(data.uprightFactor)
		elseif data.isUpright then
			ret[#ret + 1] = 'upright'
		elseif data.theWidth and data.theHeight then
			ret[#ret + 1] = string.format('%dx%dpx', data.theWidth, data.theHeight)
		elseif data.theWidth then
			ret[#ret + 1] = tostring(data.theWidth) .. 'px'
		elseif data.theHeight then
			ret[#ret + 1] = string.format('x%dpx', data.theHeight)
		end
 
		-- Render named parameters.
		-- That includes link, alt, page, class, lang, start, end, and thumbtime.
		do
			local namedParameters = {
				{'link', 'theLink'},
				{'alt', 'theAlt'},
				{'page', 'thePage'},
				{'class', 'theClass'},
				{'lang', 'theLang'},
				{'start', 'theStartTime'},
				{'end', 'theEndTime'},
				{'thumbtime', 'theThumbTime'}
			}
			for i, t in ipairs(namedParameters) do
				local parameter = t[1]
				local value = data[t[2]]
				if value then
					ret[#ret + 1] = parameter .. '=' .. tostring(value)
				end
			end
		end
 
		-- Caption
		ret[#ret + 1] = data.theCaption
 
		return string.format('[[%s]]', table.concat(ret, '|'))
	end
 
	local privateFields = {
		theName = true,
		theFormat = true,
		theFormatFilename = true,
		theWidth = true,
		theHeight = true,
		isUpright = true,
		uprightFactor = true,
		theLocation = true,
		theAlignment = true,
		hasBorder = true,
		theLink = true,
		theAlt = true,
		thePage = true,
		theClass = true,
		theLang = true,
		theCaption = true
	}
 
	local readOnlyFields = {}
	for field in pairs(data) do
		readOnlyFields[field] = true
	end
	readOnlyFields.theName = nil -- This is set if a filename is given to fileLink.new, so remove it.
 
	local function restrictedFieldError(key, restriction)
		error(string.format(
			"-{zh-cn:文件链接;zh-tw:檔案連結}-对象字段 '%s' 是 %s",
			tostring(key),
			restriction
		), 3)
	end
 
	setmetatable(obj, {
		__index = function (t, key)
			if privateFields[key] then
				restrictedFieldError(key, 'private')
			else
				return data[key]
			end
		end,
		__newindex = function (t, key, value)
			if privateFields[key] then
				restrictedFieldError(key, 'private')
			elseif readOnlyFields[key] then
				restrictedFieldError(key, 'read-only')
			else
				data[key] = value
			end
		end,
		__tostring = function (t)
			return t:render()
		end,
		__pairs = function ()
			local temp = {}
			for k, v in pairs(data) do
				if not privateFields[k] then
					temp[k] = v
				end
			end
			return pairs(temp)
		end
	})
 
	return obj
end
 
return fileLink

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