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local util_args = require('Module:ArgsUtil')
local util_table = require('Module:TableUtil')
local util_text = require('Module:TextUtil')
local util_vars = require('Module:VarsUtil')
local bool_false = { ['false'] = true, ['0'] = true, ['no'] = true, [''] = true }
local argPrefix = 'q?'
local lang = mw.getLanguage('en')
local bool_to_str = { [true] = 'Yes', [false] = 'No' }

local p = {}

function p.queryAndCast(query, dontcast)
	local tables = util_table.concatIfTable(query.tables)
	local fields = util_table.concatIfTable(query.fields)
	query.join = util_table.concatIfTable(query.join)

	local result = mw.ext.cargo.query(tables, fields, query)
	
	if dontcast then
		return result
	else
		p.cast(result, query.types or {}, query.coalesce or {})
		return result
	end
end

function p.cast(result, types, coalesce)
	for i, row in ipairs(result) do
		for k, v in pairs(row) do
			row[k] = p.castField(v, types[k])
			for coalesceKey, coalesceValueList in pairs(coalesce) do
				row[coalesceKey] = p.coalesce(row, coalesceValueList)
			end
		end
	end
end

function p.coalesce(row, tbl)
	for _, v in ipairs(tbl) do
		if row[v] then
			return row[v]
		end
	end
	return nil
end

function p.castField(v, v_type)
	if v == '' then
		return nil
	elseif v_type == 'boolean' then
		return p.strToBool(v)
	elseif v_type == 'number' then
		return tonumber(v)
	else
		return v
	end
end

function p.getOneResult(query)
	local result = p.queryAndCast(query)
	if result[1] then
		return result[1][query.fields]
	end
	return nil
end

function p.getOneRow(query)
	local result = p.queryAndCast(query)
	return result[1] or {}
end

function p.getOneField(query, field)
	local result = p.queryAndCast(query)
	local tbl = {}
	for i, row in ipairs(result) do
		tbl[#tbl+1] = row[field]
	end
	return tbl
end

function p.strToBool(v)
	if not v then
		return false
	elseif bool_false[lang:lc(v)] then
		return false
	end
	return true
end

function p.makeDict(result, key)
	local tbl = {}
	for _, row in ipairs(result) do
		tbl[row[key]] = row
	end
	return tbl
end

function p.makeConstDict(result, key, value)
	local tbl = {}
	for _, row in ipairs(result) do
		tbl[row[key]] = row[value]
	end
	return tbl
end

function p.makeOrderedDict(result, key, sortkey, increasing)
	--[[
	Format the table like this:
	{
		a1, a2, a3, a4,
		a1 = { key = value, ... },
		a2 = { key = value, ... },
		a3 = { key = value, ... },
		a4 = { key = value, ... }
	}
	]]
	local tbl = {}
	for k, row in ipairs(result) do
		tbl[k] = row[key]
		tbl[row[key]] = mw.clone(row)
	end
	if sortkey then
		util_table.dictByKeys(tbl, sortkey, increasing)
	end
	return tbl
end

function p.getOrderedDict(query, key, sortkey, increasing)
	local result = p.queryAndCast(query)
	return p.makeOrderedDict(result, key, sortkey, increasing)
end

function p.getOrderedList(query, key)
	local result = p.queryAndCast(query)
	return p.makeOrderedList(result, key)
end

function p.makeOrderedList(result, key)
	local tbl = {}
	for k, row in ipairs(result) do
		tbl[#tbl+1] = row[key]
	end
	return tbl
end

function p.groupResultOrdered(result, key, f)
	local data = {}
	local this
	local thisvalue
	local thistab
	local i = 1
	for _, row in ipairs(result) do
		if not row[key] then row[key] = 'Uncategorized' end
		if row[key] ~= thisvalue then
			data[#data+1] = { name = row[key], index = i }
			i = i + 1
			thistab = data[#data] or {}
			thisvalue = row[key]
		end
		thistab[#thistab+1] = f and f(row) or row
	end
	return data
end	

function p.groupResultByValue(result, key, f)
	local data = {}
	local this
	local thisvalue
	local i = 1
	for _, row in ipairs(result) do
		if row[key] ~= thisvalue then
			thisvalue = row[key]
			data[thisvalue] = { name = row[key] }
			i = i + 1
			thistab = data[thisvalue]
		end
		thistab[#thistab+1] = f and f(row) or row
	end
	return data
end

function p.queryFromArgs(args, defaults)
	-- sometimes we want to specify query args in the template
	-- this function parses them into args that cargo will understand
	-- change argPrefix above to change the prefix for query params
	local query = mw.clone(defaults or {})
	for k, v in pairs(args) do
		if string.sub(k, 0, 2) == argPrefix then
			query[string.sub(k,3)] = v
		end
	end
	return query
end

function p.store(tbl)
	tbl[1] = ''
	for k, v in pairs(tbl) do
		if type(v) == 'boolean' then
			tbl[k] = bool_to_str[v]
		end
	end
	mw.getCurrentFrame():callParserFunction{
		name = '#cargo_store',
		args = tbl
	}
	return
end

function p.doWeStoreCargo(nocargo, desiredNamespace,title)
	local argOkay = not util_args.castAsBool(nocargo)
	if not desiredNamespace then
		return argOkay
	end
	if not title then
		title = mw.title.getCurrentTitle()
	end
	return argOkay and title.nsText == desiredNamespace
end

function p.whereFromArg(str, ...)
	-- if an arg is defined, formats a string with the arg to be included in a where table
	-- if it's not defined, returns false and NOT nil so the table can be used
	-- with util_table.concat
	if not next({...}) then
		return false
	else
		return str:format(...)
	end
end

function p.whereFromArgList(str, argTbl, sep, f)
	if not sep then sep = '%s*,%s*' end
	if not argTbl then return nil end
	argTbl = util_table.guaranteeTable(argTbl)
	if not next(argTbl) then return end
	local splitArgs = {}
	for _, arg in ipairs(argTbl) do
		splitArgs[#splitArgs+1] = util_args.splitAndMap(arg, sep, f)
	end
	local argsForFormat = {}
	for lineIndex, v in ipairs(splitArgs[1]) do
		argsForFormat[lineIndex] = {}
		for i, arg in ipairs(splitArgs) do
			argsForFormat[lineIndex][i] = arg[lineIndex]
		end
	end
	local where = {}
	for _, condition in ipairs(argsForFormat) do
		where[#where+1] = p.whereFromArg(str, unpack(condition))
	end
	return ('(%s)'):format(p.concatWhereOr(where))
end

function p.concatWhere(tbl)
	local arr = {}
	-- pairs because maybe some entries are nil, and since it's an AND, order doesn't matter
	for _, v in pairs(tbl) do
		if v then
			arr[#arr+1] = v
		end
	end
	if not next(arr) then return nil end
	return '(' .. util_table.concat(arr, ' AND ') .. ')'
end

function p.concatWhereOr(tbl)
	local arr = {}
	-- pairs because maybe some entries are nil, and since it's an AND, order doesn't matter
	for _, v in pairs(tbl) do
		if v then
			arr[#arr+1] = v
		end
	end
	return '(' .. util_table.concat(arr, ' OR ') .. ')'
end

function p.fakeHolds(field, str, sep)
	sep = sep or ','
	return ('%s__full RLIKE ".*(^|%s)%s($|%s).*"'):format(field, sep, str, sep)
end

function p.makeMinMaxQuery(query, field, orderby, order)
	-- modifies a pre-existing query to add an extra set of conditions to get the max/min value of some field
	-- order will be either MIN or MAX, and orderby is usually going to be a date/datetime
	-- example: c.makeMinMaxQuery(query, 'SP.Champion','SP.Time','MAX')
	--to get the most-recent played champions
	local query2 = mw.clone(query)
	query2.fields = ("%s(%s)=value, %s=field"):format(order or 'MAX', orderby, field)
	local result = p.queryAndCast(query2)
	util_table.mapInPlace(result, function(row)
		return row.value and ('(%s="%s" AND %s="%s")'):format(field, row.field, orderby, row.value)
	end)
	local newwhere = {
		next(result) and ("(%s)"):format(p.concatWhereOr(result)),
		query.where and ("(%s)"):format(query.where)
	}
	return p.concatWhere(newwhere)
end

function p.getUniqueLine(...)
	local args = {...}
	for k, v in ipairs(args) do
		if type(v) == 'string' then
			args[k] = util_vars.getGlobalIndex(v) or v
		end
	end
	return mw.title.getCurrentTitle().text .. util_table.concat(args, '_')
end

return p
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