local platform = require 'bee.platform'
local pub      = require 'pub'
local task     = require 'task'

local m = {}

m.openMap = {}
m.fileMap = {}

--- 打开文件
function m.open(uri)
    if platform.OS == 'Windows' then
        uri = uri:lower()
    end
    m.openMap[uri] = true
end

--- 关闭文件
function m.close(uri)
    if platform.OS == 'Windows' then
        uri = uri:lower()
    end
    m.openMap[uri] = nil
end

--- 设置文件文本
function m.setText(uri, text)
    if platform.OS == 'Windows' then
        uri = uri:lower()
    end
    if not m.fileMap[uri] then
        m.fileMap[uri] = {}
    end
    local file = m.fileMap[uri]
    file.text = text
    if file.compiling then
        pub.removeTask(file.compiling)
    end
    file.compiling = pub.asyncTask('compile', text, function (ast)
        file.ast = ast
        file.compiling = nil
        local onCompiledList = file.onCompiledList
        if onCompiledList then
            file.onCompiledList = nil
            for _, callback in ipairs(onCompiledList) do
                callback()
            end
        end
    end)
end

--- 监听编译完成
function m.onCompiled(uri, callback)
    if platform.OS == 'Windows' then
        uri = uri:lower()
    end
    local file = m.fileMap[uri]
    if not file then
        return
    end
    if not file.onCompiledList then
        file.onCompiledList = {}
    end
    file.onCompiledList[#file.onCompiledList+1] = callback
end

--- 获取文件文本
function m.getText(uri)
    if platform.OS == 'Windows' then
        uri = uri:lower()
    end
    local file = m.fileMap[uri]
    if not file then
        return nil
    end
    return file.text
end

--- 获取文件语法树（同步）
function m.getAst(uri)
    if platform.OS == 'Windows' then
        uri = uri:lower()
    end
    local file = m.fileMap[uri]
    if not file.compiling then
        return file.ast
    end
    pub.jumpQueue(file.compiling)
    task.wait(function (waker)
        m.onCompiled(file, waker)
    end)
    return file.ast
end

return m