-- This module implements Template:Bibleverse.
local p = {}

--codes from bvf that may be in use
local version_num_cds = {
	[9] = 'kjv', [31] = 'niv', [45] = 'amp', [49] = 'nasb', [64] = 'nivuk',
	[51] = 'nlt', [65] = 'msg', [76] = 'nirv', [105] = 'he', [104] = 'jps',
	[120] = 'opb', [121] = 'bb', [122] = 'bbc', [123] = 'bbl', [131] = 'nrsv',
}

--possible book inputs, based on Chicago Manual
local book_aliases = {
	['genesis'] = {'gen', 'gn'},                          --old testament/tanakh
	['exodus'] = {'exod', 'ex'},
	['leviticus'] = {'lev', 'lv'},
	['numbers'] = {'num', 'nm'},
	['deuteronomy'] = {'deut', 'dt'},
	['joshua'] = {'josh' , 'jo'},
	['judges'] = {'judg', 'jgs'},
	['ruth'] = {'ru'},
	['1_samuel'] = {'1sam', '1sm'},
	['2_samuel'] = {'2sam', '2sm'},
	['1_kings'] = {'1kgs'},
	['2_kings'] = {'2kgs'},
	['1_chronicles'] = {'1chron', '1chr'},
	['2_chronicles'] = {'2chron', '2chr'},
	['ezra'] = {'ezr'},
	['nehemiah'] = {'neh'},
	['esther'] = {'est'},
	['job'] = {'jb'},
	['psalms'] = {'ps', 'pss', 'psalm'},
	['proverbs'] = {'prov', 'prv'},
	['ecclesiastes'] = {'eccles', 'eccl', 'qoheleth'},
	['song_of_solomon'] = {'songofsol', 'songofsongs', 'song', 'sg', 'canticles', 'canticleofcanticles'},
	['isaiah'] = {'isa', 'is'},
	['jeremiah'] = {'jer'},
	['lamentations'] = {'lam'},
	['ezekiel'] = {'ezek', 'ez'},
	['daniel'] = {'dan', 'dn'},
	['hosea'] = {'hos'},
	['joel'] = {'jl'},
	['amos'] = {'am'},
	['obadiah'] = {'obad', 'ob'},
	['jonah'] = {'jon'},
	['micah'] = {'mic', 'mi'},
	['nahum'] = {'nah', 'na'},
	['habakkuk'] = {'hab', 'hb'},
	['zephaniah'] = {'zeph', 'zep'},
	['haggai'] = {'hag', 'hg'},
	['zechariah'] = {'zech', 'zec'},
	['malachi'] = {'mal'},
	['baruch'] = {'bar'},                                            --apocrypha/deuterocanon
	['ecclesiasticus'] = {'ecclus', 'wisdomofsirach', 'sirach', 'sir'},
	['1_esdras'] = {'1esd'},
	['2_esdras'] = {'2esd'},
	['judith'] = {'jth', 'jdt'},
	['1_maccabees'] = {'1macc', '1mc'},
	['2_maccabees'] = {'2macc', '2mc'},
	['3_maccabees'] = {'3macc', '3mc'},
	['4_maccabees'] = {'4macc', '4mc'},
	['prayer_of_manasseh'] = {'profman', 'prayerofmanasses'},
	['susanna'] = {'sus'},
	['tobit'] = {'tob', 'tb'},
	['wisdom_of_solomon'] = {'ws', 'wisdom', 'wisofsol'},
	['prayer_of_azariah'] = {'prayerofazariahandhymnofthethreechildren'},
	['rest_of_esther'] = {'additionstoesther'},
	['bel_and_the_dragon'] = {'bel'},
	['epistle_of_jeremiah'] = {'letterofjeremiah'},
	['matthew'] = {'matt', 'mt'},                                        --new testament
	['mark'] = {'mk'},
	['luke'] = {'lk'},
	['john'] = {'jn'},
	['acts'] = {'actsoftheapostles'},
	['romans'] = {'rom'},
	['1_corinthians'] = {'1cor'},
	['2_corinthians'] = {'2cor'},
	['galatians'] = {'gal'},
	['ephesians'] = {'eph'},
	['philippians'] = {'phil'},
	['colossians'] = {'col'},
	['1_thessalonians'] = {'1thess', '1thes'},
	['2_thessalonians'] = {'2thess', '2thes'},
	['1_timothy'] = {'1tim', '1tm'},
	['2_timothy'] = {'2tim', '2tm'},
	['titus'] = {'ti'},
	['philemon'] = {'philem', 'phlm'},
	['hebrews'] = {'heb'},
	['james'] = {'jas'},
	['1_peter'] = {'1pet', '1pt'},
	['2_peter'] = {'2pet', '2pt'},
	['1_john'] = {'1jn'},
	['2_john'] = {'2jn'},
	['3_john'] = {'3jn'},
	['jude'] = {'jude'},
	['revelation'] = {'rev', 'apocalypse', 'apoc', 'rv'},
}

local apoc = {
	'1_esdras', '2_esdras', 'judith', '1_maccabees', '2_maccabees',
	'3_maccabees', '4_maccabees', 'prayer_of_manasseh', 'susanna', 'tobit',
	'wisdom_of_solomon', 'prayer_of_azariah', 'rest_of_esther', 'bel_and_the_dragon',
	'epistle_of_jeremiah',
}

--these books only have one chapter, have to be handled differently
local no_chaps = {
	'obadiah', 'epistle_of_jeremiah', 'prayer_of_azariah',
	'susanna', 'bel_and_the_dragon', 'prayer_of_manasseh', 'philemon', '2_john',
	'3_john', 'jude',
}

--sets the website to be used for each version, biblegateway is the fallback so don't define any for it
local site_tbl = {
	nrsv = 'oremus', nrsvae = 'oremus',
	kjv = 'wikisource', asv = 'wikisource',
	he = 'mechon_mamre', jps = 'mechon_mamre',
	niv = 'biblica', nivuk = 'biblica', amp = 'biblica', ab = 'biblica',
	nasb = 'biblica', msg = 'biblica', nlt = 'biblica', nirv = 'biblica',
	nab = 'usccb',
	bb = 'bible_hub', bbc = 'bible_hub', bbl = 'bible_hub', opb = 'bible_hub',
	esv = 'esv_bible',
}

--pattern for the url of each site, use _book, v_range, etc. for variables
local urlpat_tbl = {
	oremus = 'https://bible.oremus.org/?passage=_book+v_range&version=_version',
	wikisource = 's:Bible (_version)/_book#s_chap:s_vers',
	mechon_mamre = 'https://www.mechon-mamre.org/_version_books_chap.htm#s_vers',
	biblica = 'https://www.biblica.com/bible/?osis=_version:_book.v_range',
	usccb = 'http://www.usccb.org/bible/_book.s_chap:s_vers',
	biblegateway = 'https://www.biblegateway.com/passage/?search=_book%20v_range&version=_version',
	bible_hub = 'https://_version/_book/s_chap-s_vers.htm',
	esv_bible = 'https://www.esv.org/_book+s_chap:s_vers',
}

--changes book name to use in url for each site, only if necessary
local site_book_tbl = {
	oremus = {
		['epistle_of_jeremiah'] = 'letter of jeremiah',
	},
	usccb = {
		['song_of_solomon'] = 'song_of_songs',
		['wisdom_of_solomon'] = 'wisdom',
		['ecclesiasticus'] = 'sirach',
	},
	mechon_mamre = {
		['genesis'] = '01', ['exodus'] = '02', ['leviticus'] = '03',
		['numbers'] = '04', ['deuteronomy'] = '05', ['joshua'] = '06',
		['judges'] = '07', ['1_samuel'] = '08a', ['2_samuel'] = '08b',
		['1_kings'] = '09a', ['2_kings'] = '09b', ['isaiah'] = '10',
		['jeremiah'] = '11', ['ezekiel'] = '12', ['hosea'] = '13',
		['joel'] = '14', ['amos'] = '15', ['obadiah'] = '16', ['jonah'] = '17',
		['micah'] = '18', ['nahum'] = '19', ['habakkuk'] = '20',
		['zephaniah'] = '21', ['haggai'] = '22', ['zechariah'] = '23',
		['malachi'] = '24', ['1_chronicles'] = '25a', ['2_chronicles'] = '25b',
		['psalms'] = '26', ['job'] = '27', ['proverbs'] = '28', ['ruth'] = '29',
		['song_of_solomon'] = '30', ['ecclesiastes'] = '31', ['lamentations'] = '32',
		['esther'] = '33', ['daniel'] = '34', ['ezra'] = '35a', ['nehemiah'] = '35b',
	}
}

--changes to the version name to be used in urls, only if necessary
local site_version_tbl = {
	mechon_mamre = {
		he = 'p/pt/pt',
		jps = 'e/et/et',
	},
	wikisource = {
		kjv = 'King James', ['9'] = 'King James',
		asv = 'American Standard',
	},
	bible_hub = {
		bb = 'biblebrowser.com',
		bbc = 'biblecommenter.com',
		bbl = 'scripturetext.com',
		opb = 'bible.cc',
	}
}

local function trimArg(arg)
	if arg == '' or arg == ' ' or arg == nil then
		return nil
	else
		return mw.text.trim(arg)
	end
end

local function valueExists(tbl, value)
	for k,v in pairs(tbl) do
		if value == v then
			return true
		end
	end
	return false
end

local function titlecase(arg)
	-- http://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html
	-- recommended by The U.S. Government Printing Office Style Manual:
	-- 'Capitalize all words in titles of publications and documents,
	-- except a, an, the, at, by, for, in, of, on, to, up, and, as, but, or, and nor.'
	local alwayslower = {
		['a'] = true, ['an'] = true, ['the'] = true,
		['and'] = true, ['but'] = true, ['or'] = true, ['for'] = true,
		['nor'] = true, ['on'] = true, ['in'] = true, ['at'] = true, ['to'] = true,
		['from'] = true, ['by'] = true, ['of'] = true, ['up'] = true,
	}
	local res = ''
	local s = mw.text.trim(arg or '')
	local words = mw.text.split( s, '_')
	for i, s in ipairs(words) do
		s = string.lower(s)
		if i > 1 then
			if not alwayslower[s] then
				s = mw.getContentLanguage():ucfirst(s)
			end
		else
			s = mw.getContentLanguage():ucfirst(s)
		end
		words[i] = s
	end
	return table.concat(words, '_')
end

function p.main(frame)
	local args = frame:getParent().args

	local default_version = 'nrsv'
	local input_book = ''
	local ref = ''
	local version = ''
	local version_num
	local text = ''
	local this_page = mw.title.getCurrentTitle()
	local mainspace = this_page:inNamespaces( 0 )
	if trimArg(args[1]) == nil or trimArg(args[2]) == nil or tonumber(trimArg(args[1])) ~= nil then
		-- first argument is a numeric prefix and second is book name
		input_book = trimArg((args[1] or '') .. ' ' .. (trimArg(args[2]) or '')) or ''
		ref = trimArg(args[3]) or ''
		version = mw.ustring.lower(trimArg(args[4]) or default_version)
		text = trimArg(args[5]) or trimArg((input_book .. ' ' .. ref))
	else
		-- first argument is the whole book name
		input_book = trimArg(args[1]) or ''
		ref = trimArg(args[2]) or ''
		version = mw.ustring.lower(trimArg(args[3]) or default_version)
		text = trimArg(args[4]) or (input_book .. ' ' .. ref)
	end

	if trimArg(args.nobook) == 'yes' then
		text = ref
	end

	if tonumber(version) ~= nil then
		version = tonumber(version)
		version_num = true
	end

	version = version_num_cds[version] or version

	local errors = {}
	if version == 'jpr' or version == 'jp' then  --chabad doesn't work so reroute
		version = 'he'
		if mainspace then
			table.insert(errors, '[[Category:Pages wi Bible version errors]]')
		end
	end

	local book = mw.ustring.gsub(input_book, '%p', '')
	book = mw.ustring.gsub(book, ' ', '_')
	book = mw.ustring.lower(book)

	local book_found = false
	for full_books, alias_tbls in pairs(book_aliases) do
		if mw.ustring.gsub(book, '_', '') == mw.ustring.gsub(full_books, '_', '') then  --is the book already standardized?
			book_found = true
		elseif valueExists(book_aliases[full_books], mw.ustring.gsub(book, '_', '')) then  --check to see if it exists as a value in each table
			book = full_books
			book_found = true
		end
	end

	local site = site_tbl[version] or 'biblegateway'    --fall back on biblegateway for unrecognized version because it has so many versions

	if valueExists(apoc, book) and version == 'nrsv' and site == 'oremus' then  --oremus's nrsv doesn't have the apocrypha
		version = 'nrsvae'
	end                            --the anglicized version does

	local urlpat = urlpat_tbl[site]

	local split_ref = mw.text.split(ref, '[-–—]')       --split the ref into the part before and after the dash/hyphen
	local s_ref = mw.text.split(split_ref[1], '%p')     --any punctuation can be used to separate chapter from verse
	local e_ref = split_ref[2] or split_ref[1]
	local e_ref = mw.text.split(e_ref, '%p')
	for i, v in ipairs(s_ref) do s_ref[i] = mw.ustring.gsub(v, '%D', '') end      --remove any non-numeric character (such as f)
	for i, v in ipairs(e_ref) do e_ref[i] = mw.ustring.gsub(v, '%D', '') end

	local e_chap, e_vers, s_chap, s_vers
	if valueExists(no_chaps, book) then
		s_chap = 1
		s_vers = s_ref[1] or s_ref[2] or 1
		e_chap = 1
		e_vers = e_ref[2] or e_ref[1] or 1
	else
		s_chap = s_ref[1] or 1
		s_vers = s_ref[2] or 1
		if e_ref[2] or not s_ref[2] then     --chapter-chapter or chapter(:verse)?-chapter:verse
			e_chap = e_ref[1] or s_chap
		else                                 --chapter:verse-verse
			e_chap = s_chap
		end
		e_vers = e_ref[2] or e_ref[1] or s_vers
	end

	if type(site_book_tbl[site]) == 'table' then
		book = site_book_tbl[site][book] or book
	end

	book = titlecase(book)                              --put book in title case, only because it looks better at oremus where they display the input

	if site == 'mechon_mamre' then                      --special case handling of aspects of the components of the url
		s_chap = string.format( '%x', s_chap/10 ) .. string.sub(string.format('%02d', s_chap), -1)
	elseif (site == 'oremus') or (site == 'esv_bible') then
		book = mw.ustring.gsub(book, '_', '+')
	elseif site == 'bible_hub' then
		book = string.lower(book)
	elseif site == 'usccb' then
		book = mw.ustring.gsub(book, '_', '')
	end

	if type(site_version_tbl[site]) == 'table' then
		version = site_version_tbl[site][version]
	end

	local v_range
	if s_ref[2] == nil then                             --case of chapter range only
		v_range = s_chap ..'–' .. e_chap
	else
		v_range = s_chap ..':' .. s_vers ..'–' .. e_chap ..':' .. e_vers    --case of chapter and verse range
	end

	local url = mw.ustring.gsub(urlpat, '_book', book)  --get the components into the urls
	url = mw.ustring.gsub(url, 's_chap', s_chap)
	url = mw.ustring.gsub(url, 's_vers', s_vers)
	url = mw.ustring.gsub(url, 'e_chap', e_chap)
	url = mw.ustring.gsub(url, 'e_vers', e_vers)
	url = mw.ustring.gsub(url, 'v_range', v_range)
	url = mw.ustring.gsub(url, '_version', version)

	local fulllink
	if site == 'wikisource' then                        --interwikilink
		fulllink = '[[' .. url .. '|' .. text .. ']]'
	else
		fulllink = '[' .. url .. ' ' .. text .. ']'
	end

	if not book_found and mainspace == true then
		table.insert(errors, '[[Category:Pages wi Bible beuk errors]]')
	end
	if version_num and mainspace == true then
		table.insert(errors, '[[Category:Pages wi numeric Bible version references]]')
	end

	return fulllink .. (table.concat(errors) or '')
end

return p