Module:Img

---

local p = {}
local findId = require("Module:FindId")

local dataModuleNames = {
	item = "Module:Items/data",
	enchantment = "Module:Enchantment/data",
	location = "Module:Location/data",
	monster = "Module:Items/data"
}

local idListType = {
	[1] = {
		[1] = "item",
		[2] = "itemImage"
	},
	[2] = {
		[1] = "monster",
		[2] = "image"
	},
	[3] = {
		[1] = "enchantment",
		[2] = "buffIcon"
	},
	[4] = {
		[1] = "location",
		[2] = "locationImage"
	}
}

local loadedDataModules = {}

--
-- Loads data modules
--
-- @param dataType {string}
-- @return {data table}
--
function p.loadData (dataType)
	local moduleName = dataModuleNames[dataType]
	if loadedDataModules[moduleName] == nil then
		loadedDataModules[moduleName] = mw.loadData(moduleName)
	end
	return loadedDataModules[moduleName]
end

--
-- Helps capitalise the first letter of each word
--
-- @param first {string}
-- @param rest {string}
-- @return {strings}
--
local function tchelper(first, rest)
    return first:upper()..rest:lower()
end

--
-- Generates a full url
--
-- @param url {string}
-- @return {string}
--
local function fullUrl(url)
	local newUrl = url
	if url:sub(1,5) == "https" then
		return newUrl
	end

	if url:sub(1,1) ~= "/" then
		newUrl = "/" .. newUrl
	end

	newUrl = "https://www.play.idlescape.com" .. newUrl
	return newUrl
end

-- 
-- Finds input's id and input's type
--
-- @param name {string}
-- @return {number}
-- @return {string}
local function findInputId(name)
	local id
	local inputType
	for index, value in ipairs(idListType) do
		id = findId._findId({name, value[1]})
		if type(id) == "number" then
			inputType = value[1]
			return id , inputType
		end
	end
	return 0
end

--
-- Finds arg's image url
--
-- @param id {number}
-- @param inputType {string}
-- @return {string}
--
local function findImageUrl(id, inputType)
	local imageUrl
	for index, value in ipairs(idListType) do
		if value[1] == inputType then
			imageUrl = fullUrl(p.loadData(inputType)[tostring(id)][value[2]])
			return imageUrl
		end
	end
	return 0
end

--
-- Generates string with page link and <img> tag
--
-- @param name {string}
-- @param url {string}
-- @param width {number}
-- @param height {number}
-- @param word {number}
-- @return {string}
--
local function image(name, url, width, height, word)
	local s = url
	s = "src=\"".. s .. "\""
	s = s .. " alt=\"" .. name .. "\""
	s = s .. " width=\"" .. width .. "px\""
	if type(height) == "number" then
		s = s .. " height=\"" .. height .. "px\""
	else
		s = s .. " height=\"" .. height .. "\""
	end
	s = '<img ' .. s .. '>'
	if word == 1 then
		s = s .. "&nbsp;" .. name
	end
	s = '[[' .. name:gsub("(%a)([%w_']*)", tchelper) .. '|' .. s .. ']]'
	return s
end

--
-- Main img method accessed through #invoke
--
-- @param frame {table}
-- @return {string}
--
function p.img(frame)
	return p._img(frame:getParent().args)
end

--
-- img method to allow it to be called by other modules
--
-- @param _args {table}
-- @return {string}
--
function p._img(_args)
	local width = _args[2]
	local height = _args[3]
	local id
	local inputType
	local url
	local s
	if not width then
		width = 20
	end
	if not height then
		height = "auto"
	end
	id, inputType = findInputId(_args[1])
	if not id then
		return "couldn't find id. Check spelling or update id lists"
	end
	url = findImageUrl(id, inputType)
	if not url then
		return "couldn't find image url."
	end
	s = image(_args[1], url, width, height, _args["word"])
	return s
end

return p