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--<pre>-----------------------------------------------------------------------------
-- Unit tests for Scribunto.
-------------------------------------------------------------------------------
local DebugHelper = {}
local ScribuntoUnit = {}
 
-------------------------------------------------------------------------------
-- Concatenates keys and values, ideal for displaying a template argument table.
-- @param keySeparator glue between key and value (defaults to " = ")
-- @param separator glue between different key-value pairs (defaults to ", ")
-- @example concatWithKeys({a = 1, b = 2, c = 3}, ' => ', ', ') => "a => 1, b => 2, c => 3"
-- 
function DebugHelper.concatWithKeys(table, keySeparator, separator)
    keySeparator = keySeparator or ' = '
    separator = separator or ', '
    local concatted = ''
    local i = 1
    local first = true
    local unnamedArguments = true
    for k, v in pairs(table) do
        if first then
            first = false
        else
            concatted = concatted .. separator
        end
        if k == i and unnamedArguments then
            i = i + 1
            concatted = concatted .. tostring(v)
        else
            unnamedArguments = false
            concatted = concatted .. tostring(k) .. keySeparator .. tostring(v)
        end
    end
    return concatted
end
 
-------------------------------------------------------------------------------
-- Compares two tables recursively (non-table values are handled correctly as well).
-- @param ignoreMetatable if false, t1.__eq is used for the comparison
-- 
function DebugHelper.deepCompare(t1, t2, ignoreMetatable)
    local type1 = type(t1)
    local type2 = type(t2)
 
    if type1 ~= type2 then 
        return false 
    end
    if type1 ~= 'table' then 
        return t1 == t2 
    end
 
    local metatable = getmetatable(t1)
    if not ignoreMetatable and metatable and metatable.__eq then 
        return t1 == t2 
    end
 
    for k1, v1 in pairs(t1) do
        local v2 = t2[k1]
        if v2 == nil or not DebugHelper.deepCompare(v1, v2) then 
            return false 
        end
    end
    for k2, v2 in pairs(t2) do
        if t1[k2] == nil then 
            return false 
        end
    end
 
    return true
end
 
-------------------------------------------------------------------------------
-- Raises an error with stack information
-- @param details a table with error details
--        - should have a 'text' key which is the error message to display
--        - a 'trace' key will be added with the stack data
--        - and a 'source' key with file/line number
--        - a metatable will be added for error handling
-- 
function DebugHelper.raise(details, level)
    level = (level or 1) + 1
    details.trace = debug.traceback('', level)
    details.source = mw.text.split(details.trace, '%s')[5]
    -- this would be more robust but does not work
    -- local match = string.match(details.trace, '^%s*stack traceback:%s*(%S*): ')
    -- details.source = match and match[1] or ''
 
--    setmetatable(details, {
--        __tostring: function() return details.text end
--    })
    error(details, level)
end
 
-------------------------------------------------------------------------------
-- when used in a test, that test gets ignored, and the skipped count increases by one.
-- 
function ScribuntoUnit:markTestSkipped()
    DebugHelper.raise({ScribuntoUnit = true, skipped = true}, 3)
end
 
-------------------------------------------------------------------------------
-- Checks that the input is true
-- @param message optional description of the test
-- 
function ScribuntoUnit:assertTrue(actual, message)
    if not actual then
        DebugHelper.raise({ScribuntoUnit = true, text = string.format("Failed to assert that %s is true", tostring(actual)), message = message}, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Checks that the input is false
-- @param message optional description of the test
-- 
function ScribuntoUnit:assertFalse(actual, message)
    if actual then
        DebugHelper.raise({ScribuntoUnit = true, text = string.format("Failed to assert that %s is false", tostring(actual)), message = message}, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Checks an input string contains the expected string
-- @param message optional description of the test
-- @param plain search is made with a plain string instead of a ustring pattern
-- 
function ScribuntoUnit:assertStringContains(pattern, s, plain, message)
	if type(pattern) ~= 'string' then
		DebugHelper.raise({
			ScribuntoUnit = true,
			text = mw.ustring.format("Pattern type error (expected string, got %s)", type(pattern)),
			message = message
		}, 2)
	end
	if type(s) ~= 'string' then
		DebugHelper.raise({
			ScribuntoUnit = true,
			text = mw.ustring.format("String type error (expected string, got %s)", type(s)),
			message = message
		}, 2)
	end
	if not mw.ustring.find(s, pattern, nil, plain) then
		local displayPattern, displayString
		if self.frame then
			displayPattern = mw.text.nowiki(pattern)
			displayString = mw.text.nowiki(s)
		else
			displayPattern = pattern
			displayString = s
		end
		DebugHelper.raise({
			ScribuntoUnit = true,
			text = mw.ustring.format('Failed to find %s "%s" in string "%s"', plain and "plain string" or "pattern", displayPattern, displayString),
			message = message
		}, 2)
	end
end
 
-------------------------------------------------------------------------------
-- Checks an input string doesn't contain the expected string
-- @param message optional description of the test
-- @param plain search is made with a plain string instead of a ustring pattern
-- 
function ScribuntoUnit:assertNotStringContains(pattern, s, plain, message)
	if type(pattern) ~= 'string' then
		DebugHelper.raise({
			ScribuntoUnit = true,
			text = mw.ustring.format("Pattern type error (expected string, got %s)", type(pattern)),
			message = message
		}, 2)
	end
	if type(s) ~= 'string' then
		DebugHelper.raise({
			ScribuntoUnit = true,
			text = mw.ustring.format("String type error (expected string, got %s)", type(s)),
			message = message
		}, 2)
	end
	local i, j = mw.ustring.find(s, pattern, nil, plain)
	if i then
		local match = mw.ustring.sub(s, i, j)
		local displayMatch, displayPattern
		if self.frame then
			displayMatch = mw.text.nowiki(match)
			displayPattern = mw.text.nowiki(pattern)
		else
			displayMatch = match
			displayPattern = pattern
		end
		DebugHelper.raise({
			ScribuntoUnit = true,
			text = mw.ustring.format('Found match "%s" for %s "%s"', displayMatch, plain and "plain string" or "pattern", displayPattern),
			message = message
		}, 2)
	end
end
 
-------------------------------------------------------------------------------
-- Checks that an input has the expected value.
-- @param message optional description of the test
-- @example assertEquals(4, add(2,2), "2+2 should be 4")
-- 
function ScribuntoUnit:assertEquals(expected, actual, message)
 
	if type(expected) == 'number' and type(actual) == 'number' then
        self:assertWithinDelta(expected, actual, 1e-8, message)
 
	elseif expected ~= actual then
        DebugHelper.raise({
            ScribuntoUnit = true, 
            text = string.format("Failed to assert that %s equals expected %s", tostring(actual), tostring(expected)), 
            actual = actual,
            expected = expected,
            message = message,
        }, 2)
    end
 
end
 
-------------------------------------------------------------------------------
-- Checks that 'actual' is within 'delta' of 'expected'.
-- @param message optional description of the test
-- @example assertEquals(1/3, 9/3, "9/3 should be 1/3", 0.000001)
function ScribuntoUnit:assertWithinDelta(expected, actual, delta, message)
    if type(expected) ~= "number" then
        DebugHelper.raise({
            ScribuntoUnit = true,
            text = string.format("Expected value %s is not a number", tostring(expected)),
            actual = actual,
            expected = expected,
            message = message,
        }, 2)
    end
    if type(actual) ~= "number" then
        DebugHelper.raise({
            ScribuntoUnit = true,
            text = string.format("Actual value %s is not a number", tostring(actual)),
            actual = actual,
            expected = expected,
            message = message,
        }, 2)
    end
    local diff = expected - actual
    if diff < 0 then diff = - diff end  -- instead of importing math.abs
    if diff > delta then
        DebugHelper.raise({
            ScribuntoUnit = true, 
            text = string.format("Failed to assert that %f is within %f of expected %f", actual, delta, expected), 
            actual = actual,
            expected = expected,
            message = message,
        }, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Checks that a table has the expected value (including sub-tables).
-- @param message optional description of the test
-- @example assertDeepEquals({{1,3}, {2,4}}, partition(odd, {1,2,3,4}))
function ScribuntoUnit:assertDeepEquals(expected, actual, message)
    if not DebugHelper.deepCompare(expected, actual) then
        if type(expected) == 'table' then
            expected = dumpObject(expected)
        end
        if type(actual) == 'table' then
            actual = dumpObject(actual)
        end
        DebugHelper.raise({
            ScribuntoUnit = true, 
            text = string.format("Failed to assert that %s equals expected %s", tostring(actual), tostring(expected)), 
            actual = actual,
            expected = expected,
            message = message,
        }, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Checks that a wikitext gives the expected result after processing.
-- @param message optional description of the test
-- @example assertResultEquals("Hello world", "{{concat|Hello|world}}")
function ScribuntoUnit:assertResultEquals(expected, text, message)
    local frame = self.frame
    local actual = frame:preprocess(text)
    if expected ~= actual then
        DebugHelper.raise({
            ScribuntoUnit = true, 
            text = string.format("Failed to assert that %s equals expected %s after preprocessing", text, tostring(expected)), 
            actual = actual,
            actualRaw = text,
            expected = expected,
            message = message,
        }, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Checks that two wikitexts give the same result after processing.
-- @param message optional description of the test
-- @example assertSameResult("{{concat|Hello|world}}", "{{deleteLastChar|Hello world!}}")
function ScribuntoUnit:assertSameResult(text1, text2, message)
    local frame = self.frame
    local processed1 = frame:preprocess(text1)
    local processed2 = frame:preprocess(text2)
    if processed1 ~= processed2 then
        DebugHelper.raise({
            ScribuntoUnit = true, 
            text = string.format("Failed to assert that %s equals expected %s after preprocessing", processed1, processed2), 
            actual = processed1,
            actualRaw = text1,
            expected = processed2,
            expectedRaw = text2,
            message = message,
        }, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Checks that a template gives the expected output.
-- @param message optional description of the test
-- @example assertTemplateEquals("Hello world", "concat", {"Hello", "world"})
function ScribuntoUnit:assertTemplateEquals(expected, template, args, message)
    local frame = self.frame
    local actual = frame:expandTemplate(template, args)
    if expected ~= actual then
        DebugHelper.raise({
            ScribuntoUnit = true, 
            text = string.format("Failed to assert that %s with args %s equals expected %s after preprocessing", 
                                 DebugHelper.concatWithKeys(args), template, expected),
            actual = actual,
            actualRaw = template,
            expected = expected,
            message = message,
        }, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Checks if the output returns an error
-- @param message optional description of the test
-- @example assertError("{{#invoke:abc}}", "There must be an error.")
function ScribuntoUnit:assertError(actual,  message)
    local frame = self.frame
    local function preprocess(str)
        frame:preprocess(str)
    end
 
    local isError, _ = pcall (preprocess,actual)
 
    if not isError then
       DebugHelper.raise({ScribuntoUnit = true, text = string.format("Failed to assert that %s results in an error", tostring(actual)), message = message}, 2)
    end
end
 
-------------------------------------------------------------------------------
-- Creates a new test suite.
-- @param o a table with test functions (alternatively, the functions can be added later to the returned suite)
-- 
function ScribuntoUnit:new(o)
    o = o or {}
    setmetatable(o, {__index = self})
 
    o.run = function(frame)  return self:run(o, frame) end
    return o
end
 
-------------------------------------------------------------------------------
-- Resets global counters
-- 
function ScribuntoUnit:init(frame)
    self.frame = frame
    self.successCount = 0
    self.failureCount = 0
    self.skipCount = 0
    self.results = {}
end
 
-------------------------------------------------------------------------------
-- Runs a single testcase
-- @param name test nume
-- @param test function containing assertions
-- 
function ScribuntoUnit:runTest(suite, name, test)
    local success, details = pcall(test, suite)
 
    if success then
        self.successCount = self.successCount + 1
        table.insert(self.results, {name = name, success = true})
    elseif type(details) ~= 'table' or not details.ScribuntoUnit then -- a real error, not a failed assertion
        self.failureCount = self.failureCount + 1
        table.insert(self.results, {name = name, error = true, message = 'Lua error -- ' .. tostring(details)})
    elseif details.skipped then
        self.skipCount = self.skipCount + 1
        table.insert(self.results, {name = name, skipped = true})
    else
        self.failureCount = self.failureCount + 1
        local message = details.source
        if details.message then
            message = message .. details.message .. "\n"
        end
        message = message .. details.text
        table.insert(self.results, {name = name, error = true, message = message, expected = details.expected, actual = details.actual})
    end
end
 
-------------------------------------------------------------------------------
-- Runs all tests and displays the results.
-- 
function ScribuntoUnit:runSuite(suite, frame)
    self:init(frame)
	local names = {}
    for name in pairs(suite) do
        if name:find('^test') then
			table.insert(names, name)
        end
    end
	table.sort(names) -- Put tests in alphabetical order.
	for i, name in ipairs(names) do
		local func = suite[name]
		self:runTest(suite, name, func)
	end
    return {
        successCount = self.successCount,
        failureCount = self.failureCount,
        skipCount = self.skipCount,
        results = self.results,
    }
end
 
-------------------------------------------------------------------------------
-- #invoke entry point for running the tests.
-- Can be called without a frame, in which case it will use mw.log for output
-- @param displayMode see displayResults()
-- 
function ScribuntoUnit:run(suite, frame)
    local testData = self:runSuite(suite, frame)
    if frame then
        return self:displayResults(testData, frame.args.displayMode or 'table')
    else
        return self:displayResults(testData, 'log')
    end
end
 
-------------------------------------------------------------------------------
-- Displays test results 
-- @param displayMode: 'table', 'log' or 'short'
-- 
function ScribuntoUnit:displayResults(testData, displayMode)
    if displayMode == 'table' then
        return self:displayResultsAsTable(testData)
    elseif displayMode == 'log' then
        return self:displayResultsAsLog(testData)
    elseif displayMode == 'short' then
        return self:displayResultsAsShort(testData)
    else
        error('unknown display mode')
    end
end
 
function ScribuntoUnit:displayResultsAsLog(testData)
    if testData.failureCount > 0 then
        mw.log('FAILURES!!!')
    elseif testData.skipCount > 0 then
        mw.log('Some tests could not be executed without a frame and have been skipped. Invoke this test suite as a template to run all tests.')
    end
    mw.log(string.format('Assertions: success: %d, error: %d, skipped: %d', testData.successCount, testData.failureCount, testData.skipCount))
    mw.log('-------------------------------------------------------------------------------')
    for _, result in ipairs(testData.results) do
        if result.error then
            mw.log(string.format('%s: %s', result.name, result.message))
        end
    end
end
 
-- TODO l10n
 
function ScribuntoUnit:displayResultsAsShort(testData)
    local text = string.format('success: %d, error: %d, skipped: %d', testData.successCount, testData.failureCount, testData.skipCount)
    if testData.failureCount > 0 then
        text = '<span class="error">' .. text .. '</span>'
    end
    return text
end
 
function ScribuntoUnit:displayResultsAsTable(testData)
    -- begin dev wiki change
    -- @author DarthKitty <http://c.wikia.com/wiki/User:DarthKitty>
    local successIcon, failIcon = '✔', '✘'
    -- end dev wiki change
    local text = ''
	if testData.failureCount > 0 then
		local msg = "'''$1 {{PLURAL:$1|test|tests}} failed'''."
		msg = mw.message.newRawMessage(msg, testData.failureCount):plain()
		msg = self.frame:preprocess(msg)
		text = text .. failIcon .. ' ' .. msg .. '\n'
	else
		local msg = "'''All tests passed'''."
		text = text .. successIcon .. ' ' .. msg .. '\n'
	end
 
	local htmlResultTable = mw.html.create("table"):addClass("wikitable scribunto-test-table")
	local rowNode 
	--Create header row using mw.html library
	htmlResultTable:tag("tr")
	    :tag("th"):wikitext("<br>"):done()
	    :tag("th"):wikitext("Name"):done()
        :tag("th"):wikitext("Expected"):done()
        :tag("th"):wikitext("Actual"):done()
    --populate table
    for _, result in ipairs(testData.results) do
        rowNode = mw.html.create("tr")
 
        if result.error then
            rowNode:tag("td"):wikitext(failIcon):done()
            rowNode:tag("td"):wikitext(result.name):done()
            if (result.expected and result.actual) then
                rowNode:tag("td"):wikitext(mw.text.nowiki(tostring(result.expected))):done()
                    :tag("td"):wikitext(mw.text.nowiki(tostring(result.actual))):done()
            else
                rowNode:tag("td"):attr("colspan","2")
                    :wikitext(mw.text.nowiki(result.message)):done()
            end
        else
            rowNode:tag("td"):wikitext(successIcon):done()
                :tag("td"):wikitext(result.name):done()
                :tag("td"):wikitext(""):done()
                :tag("td"):wikitext(""):done()
        end
        htmlResultTable:node(rowNode)
    end
 
    return text ..tostring(htmlResultTable)
end
 
-----
--Replacement for dumpObject
-----
function dumpObject(obj)
    local inspect = require("Module:Inspect").inspect
 
    return inspect(obj)
end
 
 
 
return ScribuntoUnit

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