local files     = require 'files'
local guide     = require 'parser.guide'
---@class vm
local vm        = require 'vm.vm'
local config    = require 'config'
local collector = require 'core.collector' 'searcher'
local define    = require 'proto.define'
local noder     = require 'core.noder'

---获取class与alias
---@param name? string
---@return parser.guide.object[]
function vm.getDocDefines(uri, name)
    if type(name) ~= 'string' then
        return {}
    end
    local cache = vm.getCache 'getDocDefines'
    if cache[name] then
        return cache[name]
    end
    local results = {}
    if name == '*' then
        for noders in collector:each(uri, 'def:dn:') do
            for id in noder.eachID(noders) do
                if  id:sub(1, 3) == 'dn:'
                and not id:find(noder.SPLIT_CHAR) then
                    for source in noder.eachSource(noders, id) do
                        if guide.isSet(source) then
                            results[#results+1] = source
                        end
                    end
                end
            end
        end
    else
        local id = 'dn:' .. name
        for noders in collector:each(uri, 'def:' .. id) do
            for source in noder.eachSource(noders, id) do
                if source.type == 'doc.class.name'
                or source.type == 'doc.alias.name' then
                    results[#results+1] = source
                end
            end
        end
    end
    cache[name] = results
    return results
end

function vm.isDocDefined(uri, name)
    if define.BuiltinType[name] then
        return true
    end
    local id = 'def:dn:' .. name
    if collector:has(uri, id) then
        return true
    end
    return false
end

function vm.isBuiltinType(name)
    return define.BuiltinType[name] == true
end

function vm.getDocEnums(doc)
    if not doc then
        return nil
    end
    local defs = vm.getDefs(doc)
    local results = {}

    for _, def in ipairs(defs) do
        if def.type == 'doc.type.enum'
        or def.type == 'doc.resume' then
            results[#results+1] = def
        end
    end

    return results
end

function vm.isMetaFile(uri)
    local status = files.getState(uri)
    if not status then
        return false
    end
    local cache = files.getCache(uri)
    if cache.isMeta ~= nil then
        return cache.isMeta
    end
    cache.isMeta = false
    if not status.ast.docs then
        return false
    end
    for _, doc in ipairs(status.ast.docs) do
        if doc.type == 'doc.meta' then
            cache.isMeta = true
            return true
        end
    end
    return false
end

function vm.getValidVersions(doc)
    if doc.type ~= 'doc.version' then
        return
    end
    if doc._validVersions then
        return doc._validVersions
    end
    local valids = {
        ['Lua 5.1'] = false,
        ['Lua 5.2'] = false,
        ['Lua 5.3'] = false,
        ['Lua 5.4'] = false,
        ['LuaJIT']  = false,
    }
    for _, version in ipairs(doc.versions) do
        if version.ge and type(version.version) == 'number' then
            for ver in pairs(valids) do
                local verNumber = tonumber(ver:sub(-3))
                if verNumber and verNumber >= version.version then
                    valids[ver] = true
                end
            end
        elseif version.le and type(version.version) == 'number' then
            for ver in pairs(valids) do
                local verNumber = tonumber(ver:sub(-3))
                if verNumber and verNumber <= version.version then
                    valids[ver] = true
                end
            end
        elseif type(version.version) == 'number' then
            valids[('Lua %.1f'):format(version.version)] = true
        elseif 'JIT' == version.version then
            valids['LuaJIT'] = true
        end
    end
    if valids['Lua 5.1'] then
        valids['LuaJIT'] = true
    end
    doc._validVersions = valids
    return valids
end

local function isDeprecated(value)
    if not value.bindDocs then
        return false
    end
    if value._deprecated ~= nil then
        return value._deprecated
    end
    for _, doc in ipairs(value.bindDocs) do
        if doc.type == 'doc.deprecated' then
            value._deprecated = true
            return true
        elseif doc.type == 'doc.version' then
            local valids = vm.getValidVersions(doc)
            if not valids[config.get(guide.getUri(value), 'Lua.runtime.version')] then
                value._deprecated = true
                return true
            end
        end
    end
    value._deprecated = false
    return false
end

function vm.isDeprecated(value, deep)
    if deep then
        local defs = vm.getDefs(value)
        if #defs == 0 then
            return false
        end
        for _, def in ipairs(defs) do
            if not isDeprecated(def) then
                return false
            end
        end
        return true
    else
        return isDeprecated(value)
    end
end

local function isAsync(value)
    if value.type == 'function' then
        if not value.bindDocs then
            return false
        end
        if value._async ~= nil then
            return value._async
        end
        for _, doc in ipairs(value.bindDocs) do
            if doc.type == 'doc.async' then
                value._async = true
                return true
            end
        end
        value._async = false
        return false
    end
    return value.async == true
end

function vm.isAsync(value, deep)
    if isAsync(value) then
        return true
    end
    if deep then
        local defs = vm.getDefs(value)
        if #defs == 0 then
            return false
        end
        for _, def in ipairs(defs) do
            if isAsync(def) then
                return true
            end
        end
    end
    return false
end

local function isNoDiscard(value)
    if value.type == 'function' then
        if not value.bindDocs then
            return false
        end
        if value._nodiscard ~= nil then
            return value._nodiscard
        end
        for _, doc in ipairs(value.bindDocs) do
            if doc.type == 'doc.nodiscard' then
                value._nodiscard = true
                return true
            end
        end
        value._nodiscard = false
        return false
    end
    return false
end

function vm.isNoDiscard(value, deep)
    if isNoDiscard(value) then
        return true
    end
    if deep then
        local defs = vm.getDefs(value)
        if #defs == 0 then
            return false
        end
        for _, def in ipairs(defs) do
            if isNoDiscard(def) then
                return true
            end
        end
    end
    return false
end

local function isCalledInFunction(param)
    if not param.ref then
        return false
    end
    local func = guide.getParentFunction(param)
    for _, ref in ipairs(param.ref) do
        if ref.type == 'getlocal' then
            if  ref.parent.type == 'call'
            and guide.getParentFunction(ref) == func then
                return true
            end
            if  ref.parent.type == 'callargs'
            and ref.parent[1] == ref
            and guide.getParentFunction(ref) == func then
                if ref.parent.parent.node.special == 'pcall'
                or ref.parent.parent.node.special == 'xpcall' then
                    return true
                end
            end
        end
    end
    return false
end

local function isLinkedCall(node, index)
    for _, def in ipairs(vm.getDefs(node)) do
        if def.type == 'function' then
            local param = def.args and def.args[index]
            if param then
                if isCalledInFunction(param) then
                    return true
                end
            end
        end
    end
    return false
end

function vm.isLinkedCall(node, index)
    return isLinkedCall(node, index)
end

function vm.isAsyncCall(call)
    if vm.isAsync(call.node, true) then
        return true
    end
    if not call.args then
        return
    end
    for i, arg in ipairs(call.args) do
        if  vm.isAsync(arg, true)
        and isLinkedCall(call.node, i) then
            return true
        end
    end
    return false
end

local function makeDiagRange(uri, doc, results)
    local names
    if doc.names then
        names = {}
        for i, nameUnit in ipairs(doc.names) do
            local name = nameUnit[1]
            names[name] = true
        end
    end
    local row = guide.rowColOf(doc.start)
    if doc.mode == 'disable-next-line' then
        results[#results+1] = {
            mode   = 'disable',
            names  = names,
            row    = row + 1,
            source = doc,
        }
        results[#results+1] = {
            mode   = 'enable',
            names  = names,
            row    = row + 2,
            source = doc,
        }
    elseif doc.mode == 'disable-line' then
        results[#results+1] = {
            mode   = 'disable',
            names  = names,
            row    = row,
            source = doc,
        }
        results[#results+1] = {
            mode   = 'enable',
            names  = names,
            row    = row + 1,
            source = doc,
        }
    elseif doc.mode == 'disable' then
        results[#results+1] = {
            mode   = 'disable',
            names  = names,
            row    = row + 1,
            source = doc,
        }
    elseif doc.mode == 'enable' then
        results[#results+1] = {
            mode   = 'enable',
            names  = names,
            row    = row + 1,
            source = doc,
        }
    end
end

function vm.isDiagDisabledAt(uri, position, name)
    local status = files.getState(uri)
    if not status then
        return false
    end
    if not status.ast.docs then
        return false
    end
    local cache = files.getCache(uri)
    if not cache.diagnosticRanges then
        cache.diagnosticRanges = {}
        for _, doc in ipairs(status.ast.docs) do
            if doc.type == 'doc.diagnostic' then
                makeDiagRange(uri, doc, cache.diagnosticRanges)
            end
        end
        table.sort(cache.diagnosticRanges, function (a, b)
            return a.row < b.row
        end)
    end
    if #cache.diagnosticRanges == 0 then
        return false
    end
    local myRow = guide.rowColOf(position)
    local count = 0
    for _, range in ipairs(cache.diagnosticRanges) do
        if range.row <= myRow then
            if not range.names or range.names[name] then
                if range.mode == 'disable' then
                    count = count + 1
                elseif range.mode == 'enable' then
                    count = count - 1
                end
            end
        else
            break
        end
    end
    return count > 0
end
