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-- Module:Excerpt implements the Excerpt template
-- Documentation and master version: https://en.wikipedia.org/wiki/Module:Excerpt
-- Authors: User:Sophivorus, User:Certes, User:Aidan9382 & others
-- License: CC-BY-SA-3.0

local Transcluder = require( 'Module:Transcluder' )

local yesno = require( 'Module:Yesno' )

local ok, config = pcall( require, 'Module:Excerpt/config' )
if not ok then config = {} end

local p = {}

-- Helper function to get arguments
local args
local function getArg( key, default )
	local value = args[ key ]
	if value and mw.text.trim( value ) ~= '' then
		return value
	end
	return default
end

-- Helper function to handle errors
local function getError( message, value )
	if type( message ) == 'string' then
		message = Transcluder.getError( message, value )
	end
	if config.categories and config.categories.errors and mw.title.getCurrentTitle().isContentPage then
		message:node( '[[Category:' .. config.categories.errors .. ']]' )
	end
	return message
end

-- Helper function to get localized messages
local function getMessage( key )
	local ok, TNT = pcall( require, 'Module:TNT' )
	if not ok then return key end
	return TNT.format( 'I18n/Module:Excerpt.tab', key )
end

-- Main entry point for templates
function p.main( frame )
	args = Transcluder.parseArgs( frame )

	-- Make sure the requested page exists
	local page = getArg( 1 )
	if not page or page == '{{{1}}}' then return getError( 'no-page' ) end
	local title = mw.title.new(page)
	if not title then return getError( 'invalid-title', page ) end
	if title.isRedirect then title = title.redirectTarget end
	if not title.exists then return getError( 'page-not-found', page ) end
	page = title.prefixedText

	-- Set variables from the template parameters
	local section = getArg( 2, mw.ustring.match( getArg( 1 ), '[^#]+#(.+)' ) )
	local subsections = not yesno( getArg( 'subsections' ) )



	-- Build the options for Module:Transcluder out of the template parameters and the desired defaults
	local options = {
		files = files,
		lists = lists,
		tables = tables,
		paragraphs = paragraphs,
		sections = subsections,
		categories = 0,
		references = references,
		only = only and mw.text.trim( only, 's' ) .. 's',
		noLinks = noLinks,
		noBold = noBold,
		noSelfLinks = true,
		noNonFreeFiles = onlyFreeFiles,
		noBehaviorSwitches = true,
		fixReferences = true,
		linkBold = true,
	}

	-- Get the excerpt itself
	local title = page .. '#' .. ( section or '' )
	local ok, excerpt = pcall( Transcluder.get, title, options )
	if not ok then return getError( excerpt ) end
	if mw.text.trim( excerpt ) == '' and not only then
		if section then return getError( 'section-empty', section ) else return getError( 'lead-empty' ) end
	end



	-- Remove extra line breaks but leave one before and after so the parser interprets lists, tables, etc. correctly
	excerpt = mw.text.trim( excerpt )
	excerpt = string.gsub( excerpt, '\n\n\n+', '\n\n' )
	excerpt = '\n' .. excerpt .. '\n'

	
	-- Combine and return the elements
	if inline then
		return mw.text.trim( excerpt )
	end
	local tag = 'div'
	if quote then
		tag = 'blockquote'
	end
	excerpt = mw.html.create( 'div' ):addClass( 'excerpt' ):wikitext( excerpt )
	local block = mw.html.create( tag ):addClass( 'excerpt-block' ):addClass( class )
	return block:node( styles ):node( hat ):node( excerpt ):node( more )
end

-- Entry points for backwards compatibility
function p.lead( frame ) return p.main( frame ) end
function p.excerpt( frame ) return p.main( frame ) end

return p