local jsonProcessor = auRequire("Core/JSON").projectBase

-------------------------------------------------------
-- globals
-------------------------------------------------------
_auProjects = {}
_auProjectsBlocked = {}
_auNamespacesEmitted = {}
_auResolvedDep = {}
_auCurrentProject = {}
_auCurrentBaseProject = nil
_auFatalMsg = {}

-------------------------------------------------------
-- utils
-------------------------------------------------------

local function normalizeSourceRoot(path) 
    local backup = path
    path = os.realpath(_G.path.join(os.getcwd(), path));
    if (not path) then
        print("path error, not found?", backup)
        return
    end
    return path
end

local function extendInfo(this) 
    if (not this.projectType) then return end
    local type = this.projectType:lower()
    this.isShared   = type == "sharedlib"
    this.isStatic   = type == "staticlib"
    this.isExec     = type == "consoleapp" or type == 'windowedapp'
    this.isConsole  = type == "consoleapp"
    this.isWindowed = type == "windowedapp"
end

-------------------------------------------------------
-- project loading
-------------------------------------------------------

local function addVisit(ina)
    local args = {
        namespace = ina.namespace,
        name = ina.name,                -- OPT: recommended 
        path = ina.path,
        type = ina.type,
        out = ina.out,
        options = ina.options,
        translations = ina.translations -- OPT: dictionary of dependency maps 
    }

    local path = normalizeSourceRoot(args.path)
    if (not path) then
        return
    end

    local info = {
        namespace = args.namespace,
        path = path,
        projectType = args.type,
        out = args.out,
        name = args.name,
        translations = args.translations,
        options = args.options
    }

    extendInfo(info)

    local project = {
        info = info,
        processor = nil,
        deps = {}
    }

    local cwd = auGetRoot()

    local remoteLua   = path .. "/Aurora.lua"
    local remoteJson  = path .. "/Aurora.json"
    local localJson   = cwd  .. Aurora.Settings.sRelRepoScripts .. "/" .. args.name  .. ".aurora.json"
    local localLua    = cwd  .. Aurora.Settings.sRelRepoScripts .. "/" .. args.name  .. ".aurora.lua"

    if (os.isfile(localLua)) then
        project.processor = auRequireAbs(localLua)(info)
    elseif (os.isfile(localJson)) then
        info.jpath = localJson
        project.processor = jsonProcessor(info)
    elseif (os.isfile(remoteLua)) then
        project.processor = auRequireAbs(remoteLua)(info)
    elseif (os.isfile(remoteJson)) then
        info.jpath = remoteJson
        project.processor = jsonProcessor(info)
    else
        print("Couldnt find Aurora build script for: ", path)
        return
    end

    auRequire("Core").project.expendBaseProcessor(project)

    _auProjects[info.name] = project
end 


local function addScript(ina)
    local args = {
        namespace = ina.namespace,
        script = ina.script,
        path = ina.path,
        type = ina.type,
        out = ina.out,
        options = ina.options,
        translations = ina.translations
    }

    local path = normalizeSourceRoot(args.path)
    if (not path) then
        return
    end

    local info = {
        namespace = args.namespace,
        path = path,
        projectType = args.type,
        out = args.out,
        translations = args.translations,
        options = args.options
    }

    extendInfo(info)

    local project = {
        info = info,
        processor = nil,
        deps = {}
    }
    
    local procesor = userRequire(args.script)
    if (not procesor) then
        processor = auRequireAbs(args.script)
        if (not procesor) then
            print("missing project script:", args.script, path)
            return
        end
    end

    project.processor = procesor(info)
    if (not project.processor) then
        print("script error")
        return
    end

    _auProjects[info.name] = project
end

local function pushProjectState(name, path, callback)
    local cwd = os.getcwd()
    local old = _auCurrentProject

    _auCurrentProject = name
    os.chdir(path)

    callback()

    os.chdir(cwd)
    _auCurrentProject = old
end

local function pushProject(project, callback)
    pushProjectState(project.info.name, project.info.path, callback)
end

_auLinkGuard = {}

-- private
local function processInit(project)
    if (project.isInitialized) then
        return
    end
    project.isInitialized = true

    if (project.processor.init) then
        pushProject(project, function()
            project.processor:init()
        end)
    end
end

-- private
local function initializeDependencyTree(proj, resolveProject)
    local name = proj.info.name

    _auResolvedDep[name] = name

    if (not proj.resolvedDeps) then
        if (proj.processor.resolveDependencies) then
            pushProject(proj, function()
                local depRecursive = _auFatalMsg.deps or {}
                _auFatalMsg.deps = depRecursive

                local strA = "starting resolve dependencies" .. name
                _auFatalMsg[strA] = nil
                proj.processor:resolveDependencies(function(name, soft) 
                _auFatalMsg[strA] = nil

                table.insert(proj.deps, name)

                if (_auResolvedDep[name]) then
                    return
                end

                local projRootName = (auGetBaseProjectName() or auGetCurrentProject() or "")
                local strB = "starting resolve specific " .. name .. " for " .. projRootName
                local i = #depRecursive + 1
                depRecursive[i] = strB

                local depProj = _auProjects[name]
                if (not depProj) then
                    if (not soft) then
                        auFatal("missing dependency: ", name)
                    else
                        return false
                    end
                end
                
                initializeDependencyTree(depProj, true)
                depRecursive[i] = nil
                end)
            end)
        end
        proj.resolvedDeps = true
    end

    processInit(proj)
end

local  processProject = {}
-- private
local function processNS(namespace)
    local projs = {}
    local projsIdxs = {}
      
    auForEach(_auProjects, function(proj) 
        if (proj.info.namespace ~= namespace) then
            return
        end

        local name = proj.info.name
        projs[name] = proj

        table.insert(projsIdxs, name)
    end)

    table.sort(projsIdxs, function(a, b) 
        return a:upper() < b:upper() 
    end)

    
    _auFatalMsg = {}
    _auFatalMsg["starting dependency tree"] = namespace

    auForEach(projsIdxs, function(idx) 
        initializeDependencyTree(projs[idx], true)
    end)

    
    _auFatalMsg = {}
    _auFatalMsg["starting projects"] = namespace
    auForEach(projsIdxs, function(idx) 
        _auLinkGuard = {}
        _auLinkGuard[projs[idx].info.name]= {}
        processProject(projs[idx].info.name)
    end)
end

local function processSolution()
    local hack = {}
    
    local hackIdx = {}
    auForEach(_auProjects, function(proj)
        table.insert(hackIdx, proj.info.namespace)
    end)

    table.sort(hackIdx, function(a, b) 
        return a:upper() < b:upper() 
    end)

    auForEach(hackIdx, processNS)
end 

local function attemptNS(ns)
    local attemptLoad = false
    if (not _auNamespacesEmitted[ns]) then
        auStartGroup(ns) -- only print the group once

        attemptLoad = true
    end

    group(ns) 
    return attemptLoad
end

processProject = function(name, required, noNs)

    local a = _auProjects[name]
    if (not a) then
        if (required) then
            auFatal("missing project: ", name)
        else
            return false
        end
    end

    local oldBaeProjName = _auCurrentBaseProject
    _auCurrentBaseProject = name;

    -- ensure the project is initializd
    processInit(a)

    -- recursion protection
    if (_auProjectsBlocked[name]) then
        _auCurrentBaseProject = oldBaeProjName
        return true
    end
    _auProjectsBlocked[name] = name

    -- process all within the namespace before processing the requested project 
    local ns = a.info.namespace
    local loadOthers = attemptNS(ns)

    pushProject(a, function()
        _auFatalMsg = {}
        _auFatalMsg["processing project"] = a.info.name
        a.processor:process()
        _auFatalMsg = {}
    end)

    -- cont 
    if (loadOthers) then
        _auNamespacesEmitted[ns] = "";
        processNS(ns)
    end

    _auCurrentBaseProject = oldBaeProjName

    return true 
end 

function isWeakCircularReference(depName)
    local dep = _auProjects[depName]
    if (not dep) then
        return
    end
   
    -- TODO: recursion
    for index, value in ipairs(dep.deps) do
        if (value == _auCurrentProject or value == _auCurrentBaseProject) then
            return true
        end
    end

    return false
end

local function isProjectLoaded(name) 
    local a = _auProjects[name]
    if (not a) then
        return false
    end

    return a.isInitialized
end

local function getProjectProcessor(name)
    if (not name) then
        return
    end
    local scre = _auProjects[name]
    if (not scre) then
        return
    end
    return scre.processor
end

local function getCurrentProjectName() 
    return _auCurrentProject
end

local function getBaseProjectName()
    return _auCurrentBaseProject
end

local function includeAuProject(dep, soft)
    local processor = getProjectProcessor(dep)
    if (not processor) then
        return false
    end

    local processor = getProjectProcessor(dep)
    if (not processor) then
        return false
    end

    local a = _auProjects[dep]
    if (not a) then
        if (not soft) then
            auFatal("missing project: ", dep)
        else
            return false
        end
    end

    pushProject(a, function()
        _auFatalMsg["processing project ref"] = a.info.name
        processor:handleReference(isWeakCircularReference(dep))
        _auFatalMsg["processing project ref"] = nil
    end)
    return true
end 

local function linkAuProject(dep, soft)
    local processor = getProjectProcessor(dep)
    if (not processor) then
        return false
    end

    local a = _auProjects[dep]
    if (not a) then
        if (not soft) then
            auFatal("missing project: ", dep)
        else
            return false
        end
    end

    local linkStart = false

    if (auGetCurrentProjectMeta()) then
        if (_auLinkGuard[dep] ) then
            return
        end
        _auLinkGuard[dep] = dep
    end

    if (not _auLinkGuardStart) then
        _auLinkGuardStart = true
        linkStart = true
    end

    if (auGetBaseProjectName() ~= dep) then 

        dependson(dep)

        --if (not processor:getMeta().isStatic) then
            pushProject(a, function()
                _auFatalMsg["processing project link"] = a.info.name
                processor:handleLink()
                _auFatalMsg["processing project link"] = nil
            end)
        --end
    end


    if (linkStart) then
        _auLinkGuard = {}
        _auLinkGuardStart = false
    end
    return true
end

local function importAndLinkProject(dep, soft)
    includeAuProject(dep, soft)

    local this = auGetCurrentProjectMeta()
    if (this) then
        if (this.isStatic) then
            return true
        end
    end

    linkAuProject(dep, soft)
    return true
end 


local function addFeature(feature)
    --print("adding feature ", feature)
    
    local script = Aurora.Settings.sAbsRoot .. Aurora.Settings.sRelScripts .. "/Features/" .. feature:lower() .. ".lua"

    if (not os.isfile(script)) then
        auFatal("missing feature", feature, script)
        return
    end
    
    auRequireAbs(script)()
end

return {
    addVisit = addVisit,
    addScript = addScript,
    addFeature = addFeature,
    linkAuProject = linkAuProject,
    includeAuProject = includeAuProject,
    importAndLinkProject = importAndLinkProject,
    getProjectProcessor = getProjectProcessor,
    isProjectLoaded = isProjectLoaded,
    getCurrentProjectName = getCurrentProjectName,
    processSolution = processSolution,
    getBaseProjectName = getBaseProjectName
}