local core = require 'core'
local parser  = require 'parser'
local buildVM = require 'vm'

local function catch_target(script)
    local list = {}
    local cur = 1
    while true do
        local start, finish  = script:find('<[!?].-[!?]>', cur)
        if not start then
            break
        end
        list[#list+1] = { start + 2, finish - 2 }
        cur = finish + 1
    end
    return list
end

local function founded(targets, results)
    if #targets ~= #results then
        return false
    end
    for _, target in ipairs(targets) do
        for _, result in ipairs(results) do
            if target[1] == result[1] and target[2] == result[2] then
                goto NEXT
            end
        end
        do return false end
        ::NEXT::
    end
    return true
end

function TEST(script)
    local target = catch_target(script)
    local start  = script:find('<?', 1, true)
    local finish = script:find('?>', 1, true)
    local pos = (start + finish) // 2 + 1
    local new_script = script:gsub('<[!?]', '  '):gsub('[!?]>', '  ')
    local ast = parser:parse(new_script, 'lua', 'Lua 5.3')
    assert(ast)
    local vm = buildVM(ast)
    assert(vm)

    local positions = core.definition(vm, pos, 'reference')
    if positions then
        assert(founded(target, positions))
    else
        assert(#target == 0)
    end
end

TEST [[
local <?a?> = 1
<!a!> = <!a!>
]]

TEST [[
t.<?a?> = 1
t.<!a!> = t.<!a!>
]]

TEST [[
:: <!LABEL!> ::
goto <?LABEL?>
]]

TEST [[
local a = 1
local <?a?> = 1
<!a!> = <!a!>
]]

TEST [[
local t = {
    <?a?> = 1
}
print(t.<!a!>)
]]

TEST [[
local <!mt!> = {}
function <!mt!>:a()
    <?self?>:remove()
end
]]

TEST [[
local function f()
    return <?function ()
    end?>
end

local <!f2!> = f()
]]

TEST [[
table.<!dump!>()
function table.<?dump?>()
end
]]

TEST [[
---@class <!Class!>
---@type <?Class?>
---@type <!Class!>
]]

TEST [[
---@class <?Class?>
---@type <!Class!>
---@type <!Class!>
]]