local pub        = require 'pub'
local fs         = require 'bee.filesystem'
local furi       = require 'file-uri'
local files      = require 'files'
local config     = require 'config'
local glob       = require 'glob'
local platform   = require 'bee.platform'
local await      = require 'await'
local proto      = require 'proto.proto'
local lang       = require 'language'
local library    = require 'library'
local progress   = require 'progress'
local define     = require "proto.define"
local client     = require 'client'
local plugin     = require 'plugin'
local util       = require 'utility'
local fw         = require 'filewatch'

local m = {}
m.type = 'workspace'
m.nativeVersion  = -1
m.libraryVersion = -1
m.nativeMatcher  = nil
m.fileLoaded = 0
m.fileFound  = 0
m.waitingReady   = {}
m.requireCache   = {}
m.cache          = {}
m.watchers       = {}
m.matchOption    = {}

--- 初始化工作区
function m.initPath(uri)
    log.info('Workspace inited: ', uri)
    if not uri then
        return
    end
    m.uri  = uri
    m.path = m.normalize(furi.decode(uri))
    plugin.workspace = m.path
    local logPath = fs.path(LOGPATH) / (uri:gsub('[/:]+', '_') .. '.log')
    client.logMessage('Log', 'Log path: ' .. furi.encode(logPath:string()))
    log.info('Log path: ', logPath)
    log.init(ROOT, logPath)

    fw.watch(m.path)
end

local globInteferFace = {
    type = function (path)
        local result
        pcall(function ()
            if fs.is_directory(fs.path(path)) then
                result = 'directory'
            else
                result = 'file'
            end
        end)
        return result
    end,
    list = function (path)
        local fullPath = fs.path(path)
        if not fs.exists(fullPath) then
            return nil
        end
        local paths = {}
        pcall(function ()
            for fullpath in fullPath:list_directory() do
                paths[#paths+1] = fullpath:string()
            end
        end)
        return paths
    end
}

--- 创建排除文件匹配器
function m.getNativeMatcher()
    if not m.path then
        return nil
    end
    if m.nativeMatcher then
        return m.nativeMatcher
    end

    local pattern = {}
    -- config.get 'files.exclude'
    for path, ignore in pairs(config.get 'files.exclude') do
        if ignore then
            log.info('Ignore by exclude:', path)
            pattern[#pattern+1] = path
        end
    end
    -- config.get 'workspace.useGitIgnore'
    if config.get 'Lua.workspace.useGitIgnore' then
        local buf = pub.awaitTask('loadFile', furi.encode(m.path .. '/.gitignore'))
        if buf then
            for line in buf:gmatch '[^\r\n]+' do
                if line:sub(1, 1) ~= '#' then
                    log.info('Ignore by .gitignore:', line)
                    pattern[#pattern+1] = line
                end
            end
        end
        buf = pub.awaitTask('loadFile', furi.encode(m.path .. '/.git/info/exclude'))
        if buf then
            for line in buf:gmatch '[^\r\n]+' do
                if line:sub(1, 1) ~= '#' then
                    log.info('Ignore by .git/info/exclude:', line)
                    pattern[#pattern+1] = line
                end
            end
        end
    end
    -- config.get 'workspace.ignoreSubmodules'
    if config.get 'Lua.workspace.ignoreSubmodules' then
        local buf = pub.awaitTask('loadFile', furi.encode(m.path .. '/.gitmodules'))
        if buf then
            for path in buf:gmatch('path = ([^\r\n]+)') do
                log.info('Ignore by .gitmodules:', path)
                pattern[#pattern+1] = path
            end
        end
    end
    -- config.get 'workspace.library'
    for path in pairs(config.get 'Lua.workspace.library') do
        path = m.getAbsolutePath(path)
        if path then
            log.info('Ignore by library:', path)
            pattern[#pattern+1] = path
        end
    end
    -- config.get 'workspace.ignoreDir'
    for path in pairs(config.get 'Lua.workspace.ignoreDir') do
        log.info('Ignore directory:', path)
        pattern[#pattern+1] = path
    end

    m.nativeMatcher = glob.gitignore(pattern, m.matchOption, globInteferFace)
    m.nativeMatcher:setOption('root', m.path)

    m.nativeVersion = config.get 'version'
    return m.nativeMatcher
end

--- 创建代码库筛选器
function m.getLibraryMatchers()
    if m.libraryMatchers then
        return m.libraryMatchers
    end

    local librarys = {}
    for path in pairs(config.get 'Lua.workspace.library') do
        path = m.getAbsolutePath(path)
        if path then
            librarys[m.normalize(path)] = true
        end
    end
    if library.metaPath then
        librarys[m.normalize(library.metaPath)] = true
    end
    m.libraryMatchers = {}
    for path in pairs(librarys) do
        if fs.exists(fs.path(path)) then
            local nPath = fs.absolute(fs.path(path)):string()
            local matcher = glob.gitignore(true, m.matchOption, globInteferFace)
            matcher:setOption('root', path)
            log.debug('getLibraryMatchers', path, nPath)
            m.libraryMatchers[#m.libraryMatchers+1] = {
                path    = nPath,
                matcher = matcher
            }
        end
    end

    m.libraryVersion = config.get 'version'
    return m.libraryMatchers
end

--- 文件是否被忽略
function m.isIgnored(uri)
    local path = m.getRelativePath(uri)
    local ignore = m.getNativeMatcher()
    if not ignore then
        return false
    end
    return ignore(path)
end

function m.isValidLuaUri(uri)
    if not files.isLua(uri) then
        return false
    end
    if  m.isIgnored(uri)
    and not files.isLibrary(uri) then
        return false
    end
    return true
end

local function loadFileFactory(root, progressData, isLibrary)
    return function (path)
        local uri = furi.encode(path)
        if files.isLua(uri) then
            if not isLibrary and progressData.preload >= config.get 'Lua.workspace.maxPreload' then
                if not m.hasHitMaxPreload then
                    m.hasHitMaxPreload = true
                    proto.request('window/showMessageRequest', {
                        type    = define.MessageType.Info,
                        message = lang.script('MWS_MAX_PRELOAD', config.get 'Lua.workspace.maxPreload'),
                        actions = {
                            {
                                title = lang.script.WINDOW_INCREASE_UPPER_LIMIT,
                            },
                            {
                                title = lang.script.WINDOW_CLOSE,
                            }
                        }
                    }, function (item)
                        if not item then
                            return
                        end
                        if item.title == lang.script.WINDOW_INCREASE_UPPER_LIMIT then
                            client.setConfig {
                                {
                                    key    = 'Lua.workspace.maxPreload',
                                    action = 'set',
                                    value  = config.get 'Lua.workspace.maxPreload'
                                           + math.max(1000, config.get 'Lua.workspace.maxPreload'),
                                }
                            }
                        end
                    end)
                end
                return
            end
            if not isLibrary then
                progressData.preload = progressData.preload + 1
            end
            progressData.max = progressData.max + 1
            progressData:update()
            pub.task('loadFile', uri, function (text)
                local loader = function ()
                    if text then
                        log.info(('Preload file at: %s , size = %.3f KB'):format(uri, #text / 1024.0))
                        if isLibrary then
                            log.info('++++As library of:', root)
                            files.setLibraryPath(uri, root)
                        end
                        files.setText(uri, text, false, true)
                    else
                        files.remove(uri)
                    end
                    progressData.read = progressData.read + 1
                    progressData:update()
                end
                if progressData.loaders then
                    progressData.loaders[#progressData.loaders+1] = loader
                else
                    loader()
                end
            end)
        end
        if files.isDll(uri) then
            progressData.max = progressData.max + 1
            progressData:update()
            pub.task('loadFile', uri, function (content)
                if content then
                    log.info(('Preload file at: %s , size = %.3f KB'):format(uri, #content / 1024.0))
                    if isLibrary then
                        log.info('++++As library of:', root)
                    end
                    files.saveDll(uri, content)
                end
                progressData.read = progressData.read + 1
                progressData:update()
            end)
        end
        await.delay()
    end
end

function m.awaitLoadFile(uri)
    local progressBar <close> = progress.create(lang.script.WORKSPACE_LOADING)
    local progressData = {
        max     = 0,
        read    = 0,
        preload = 0,
        update  = function (self)
            progressBar:setMessage(('%d/%d'):format(self.read, self.max))
            progressBar:setPercentage(self.read / self.max * 100)
        end
    }
    local nativeLoader    = loadFileFactory(m.path, progressData)
    local native          = m.getNativeMatcher()
    if native then
        log.info('Scan files at:', m.path)
        native:scan(furi.decode(uri), nativeLoader)
    end
end

--- 预读工作区内所有文件
function m.awaitPreload()
    local diagnostic = require 'provider.diagnostic'
    await.close 'preload'
    await.setID 'preload'
    await.sleep(0.1)
    diagnostic.pause()
    m.libraryMatchers = nil
    m.nativeMatcher   = nil
    m.fileLoaded      = 0
    m.fileFound       = 0
    m.cache           = {}
    for i, watchers in ipairs(m.watchers) do
        watchers()
        m.watchers[i] = nil
    end
    local progressBar <close> = progress.create(lang.script.WORKSPACE_LOADING)
    local progressData = {
        max     = 0,
        read    = 0,
        preload = 0,
        loaders = {},
        update  = function (self)
            progressBar:setMessage(('%d/%d'):format(self.read, self.max))
            progressBar:setPercentage(self.read / self.max * 100)
            m.fileLoaded = self.read
            m.fileFound  = self.max
        end
    }
    log.info('Preload start.')
    local nativeLoader    = loadFileFactory(m.path, progressData)
    local native          = m.getNativeMatcher()
    local librarys        = m.getLibraryMatchers()
    if native then
        log.info('Scan files at:', m.path)
        native:scan(m.path, nativeLoader)
    end
    for _, library in ipairs(librarys) do
        local libraryLoader = loadFileFactory(library.path, progressData, true)
        log.info('Scan library at:', library.path)
        library.matcher:scan(library.path, libraryLoader)
        m.watchers[#m.watchers+1] = fw.watch(library.path)
    end

    local isLoadingFiles = false
    local function loadSomeFiles()
        if isLoadingFiles then
            return
        end
        await.call(function ()
            isLoadingFiles = true
            while true do
                local loader = table.remove(progressData.loaders)
                if not loader then
                    break
                end
                loader()
                await.delay()
            end
            isLoadingFiles = false
        end)
    end

    log.info(('Found %d files.'):format(progressData.max))
    while true do
        loadSomeFiles()
        log.info(('Loaded %d/%d files'):format(progressData.read, progressData.max))
        progressData:update()
        if progressData.read >= progressData.max then
            break
        end
        await.sleep(0.1)
    end
    progressBar:remove()

    log.info('Preload finish.')

    diagnostic.start()
end

--- 查找符合指定file path的所有uri
---@param path string
function m.findUrisByFilePath(path)
    if type(path) ~= 'string' then
        return {}
    end
    local lpath = furi.encode(path):gsub('^file:///', '')
    local vm    = require 'vm'
    local resultCache = vm.getCache 'findUrisByRequirePath.result'
    if resultCache[path] then
        return resultCache[path].results, resultCache[path].posts
    end
    tracy.ZoneBeginN('findUrisByFilePath #1')
    local results = {}
    local posts = {}
    for uri in files.eachFile() do
        if not uri:find(lpath, 1, true) then
            goto CONTINUE
        end
        local pathLen = #path
        local curPath = furi.decode(uri)
        local curLen  = #curPath
        local seg = curPath:sub(curLen - pathLen, curLen - pathLen)
        if seg == '/' or seg == '\\' or seg == '' then
            local see = curPath:sub(curLen - pathLen + 1, curLen)
            if see == path then
                results[#results+1] = uri
                local post = curPath:sub(1, curLen - pathLen)
                posts[uri] = post:gsub('^[/\\]+', '')
            end
        end
        ::CONTINUE::
    end
    tracy.ZoneEnd()
    resultCache[path] = {
        results = results,
        posts   = posts,
    }
    return results, posts
end

--- 查找符合指定require path的所有uri
---@param path string
function m.findUrisByRequirePath(path)
    if type(path) ~= 'string' then
        return {}
    end
    local vm    = require 'vm'
    local cache = vm.getCache 'findUrisByRequirePath'
    if cache[path] then
        return cache[path].results, cache[path].searchers
    end
    tracy.ZoneBeginN('findUrisByRequirePath')
    local results = {}
    local mark = {}
    local searchers = {}
    for uri in files.eachDll() do
        local opens = files.getDllOpens(uri) or {}
        for _, open in ipairs(opens) do
            if open == path then
                results[#results+1] = uri
            end
        end
    end

    local input = path:gsub('%.', '/')
                      :gsub('%%', '%%%%')
    for _, luapath in ipairs(config.get 'Lua.runtime.path') do
        local part = m.normalize(luapath:gsub('%?', input))
        local uris, posts = m.findUrisByFilePath(part)
        for _, uri in ipairs(uris) do
            if not mark[uri] then
                mark[uri] = true
                results[#results+1] = uri
                searchers[uri] = posts[uri] .. luapath
            end
        end
    end
    tracy.ZoneEnd()
    cache[path] = {
        results   = results,
        searchers = searchers,
    }
    return results, searchers
end

function m.normalize(path)
    if not path then
        return nil
    end
    path = path:gsub('%$%{(.-)%}', function (key)
        if key == '3rd' then
            return (ROOT / 'meta' / '3rd'):string()
        end
    end)
    path = util.expandPath(path)
    if platform.OS == 'Windows' then
        path = path:gsub('[/\\]+', '\\')
                   :gsub('[/\\]+$', '')
    else
        path = path:gsub('[/\\]+', '/')
                   :gsub('[/\\]+$', '')
    end
    return path
end

---@return string
function m.getAbsolutePath(path)
    if not path or path == '' then
        return nil
    end
    path = m.normalize(path)
    if fs.path(path):is_relative() then
        if not m.path then
            return nil
        end
        path = m.normalize(m.path .. '/' .. path)
    end
    return path
end

---@param uriOrPath uri|string
---@return string
function m.getRelativePath(uriOrPath)
    local path
    if uriOrPath:sub(1, 5) == 'file:' then
        path = furi.decode(uriOrPath)
    else
        path = uriOrPath
    end
    if not m.path then
        local relative = m.normalize(path)
        return relative:gsub('^[/\\]+', '')
    end
    local _, pos = m.normalize(path):find(m.path, 1, true)
    if pos then
        return m.normalize(path:sub(pos + 1)):gsub('^[/\\]+', '')
    else
        return m.normalize(path):gsub('^[/\\]+', '')
    end
end

function m.isWorkspaceUri(uri)
    if not m.uri then
        return false
    end
    local ruri = m.uri
    return uri:sub(1, #ruri) == ruri
end

--- 获取工作区等级的缓存
function m.getCache(name)
    if not m.cache[name] then
        m.cache[name] = {}
    end
    return m.cache[name]
end

function m.flushCache()
    m.cache = {}
end

function m.reload()
    if not m.inited then
        return
    end
    if TEST then
        return
    end
    await.call(m.awaitReload)
end

function m.init()
    if m.inited then
        return
    end
    m.inited = true
    m.reload()
end

function m.awaitReload()
    m.ready = false
    m.hasHitMaxPreload = false
    files.flushAllLibrary()
    files.removeAllClosed()
    files.flushCache()
    plugin.init()
    m.awaitPreload()
    m.ready = true
    local waiting = m.waitingReady
    m.waitingReady = {}
    for _, waker in ipairs(waiting) do
        waker()
    end
end

---等待工作目录加载完成
function m.awaitReady()
    if m.isReady() then
        return
    end
    await.wait(function (waker)
        m.waitingReady[#m.waitingReady+1] = waker
    end)
end

function m.isReady()
    return m.ready == true
end

function m.getLoadProcess()
    return m.fileLoaded, m.fileFound
end

files.watch(function (ev, uri)
    if  ev == 'close'
    and m.isIgnored(uri)
    and not files.isLibrary(uri) then
        files.remove(uri)
    end
end)

config.watch(function (key, value, oldValue)
    if key:find '^Lua.runtime'
    or key:find '^Lua.workspace'
    or key:find '^files' then
        if value ~= oldValue then
            m.reload()
        end
    end
end)

fw.event(function (changes)
    m.awaitReady()
    for _, change in ipairs(changes) do
        local path = change.path
        local uri  = furi.encode(path)
        if  not m.isWorkspaceUri(uri)
        and not files.isLibrary(uri) then
            goto CONTINUE
        end
        if     change.type == 'create' then
            log.debug('FileChangeType.Created', uri)
            m.awaitLoadFile(uri)
        elseif change.type == 'delete' then
            log.debug('FileChangeType.Deleted', uri)
            files.remove(uri)
            local childs = files.getChildFiles(uri)
            for _, curi in ipairs(childs) do
                log.debug('FileChangeType.Deleted.Child', curi)
                files.remove(curi)
            end
        elseif change.type == 'change' then
            if m.isValidLuaUri(uri) then
                -- 如果文件处于关闭状态，则立即更新；否则等待didChange协议来更新
                if not files.isOpen(uri) then
                    files.setText(uri, pub.awaitTask('loadFile', uri), false)
                end
            else
                local filename = fs.path(path):filename():string()
                -- 排除类文件发生更改需要重新扫描
                if filename == '.gitignore'
                or filename == '.gitmodules' then
                    m.reload()
                    break
                end
            end
        end
        ::CONTINUE::
    end
end)

return m