require 'rake/clean'
require 'tempfile'

# Build Constants
REPO_ROOT = File.dirname(__FILE__)
BUILD_DIR = File.join(REPO_ROOT, "build")
REPORT_DIR = File.join(REPO_ROOT, "reports")
LMS_REPORT_DIR = File.join(REPORT_DIR, "lms")

# Packaging constants
DEPLOY_DIR = "/opt/wwc"
PACKAGE_NAME = "mitx"
LINK_PATH = "/opt/wwc/mitx"
PKG_VERSION = "0.1"
COMMIT = (ENV["GIT_COMMIT"] || `git rev-parse HEAD`).chomp()[0, 10]
BRANCH = (ENV["GIT_BRANCH"] || `git symbolic-ref -q HEAD`).chomp().gsub('refs/heads/', '').gsub('origin/', '')
BUILD_NUMBER = (ENV["BUILD_NUMBER"] || "dev").chomp()

if BRANCH == "master"
    DEPLOY_NAME = "#{PACKAGE_NAME}-#{BUILD_NUMBER}-#{COMMIT}"
else
    DEPLOY_NAME = "#{PACKAGE_NAME}-#{BRANCH}-#{BUILD_NUMBER}-#{COMMIT}"
end
PACKAGE_REPO = "packages@gp.mitx.mit.edu:/opt/pkgrepo.incoming"

NORMALIZED_DEPLOY_NAME = DEPLOY_NAME.downcase().gsub(/[_\/]/, '-')
INSTALL_DIR_PATH = File.join(DEPLOY_DIR, NORMALIZED_DEPLOY_NAME)
PIP_REPO_REQUIREMENTS = "#{INSTALL_DIR_PATH}/repo-requirements.txt"
# Set up the clean and clobber tasks
CLOBBER.include(BUILD_DIR, REPORT_DIR, 'cover*', '.coverage', 'test_root/*_repo', 'test_root/staticfiles')
CLEAN.include("#{BUILD_DIR}/*.deb", "#{BUILD_DIR}/util")

def select_executable(*cmds)
    cmds.find_all{ |cmd| system("which #{cmd} > /dev/null 2>&1") }[0] || fail("No executables found from #{cmds.join(', ')}")
end

def django_admin(system, env, command, *args)
    django_admin = ENV['DJANGO_ADMIN_PATH'] || select_executable('django-admin.py', 'django-admin')
    return "#{django_admin} #{command} --settings=#{system}.envs.#{env} --pythonpath=. #{args.join(' ')}"
end

task :default => [:test, :pep8, :pylint]

directory REPORT_DIR

default_options = {
    :lms => '8000',
    :cms => '8001',
}

task :predjango do
    sh("find . -type f -name *.pyc -delete")
    sh('pip install -e common/lib/xmodule')
    sh('git submodule update --init')
end

task :clean_test_files do
    sh("git clean -fdx test_root")
end

[:lms, :cms, :common].each do |system|
    report_dir = File.join(REPORT_DIR, system.to_s)
    directory report_dir

    desc "Run pep8 on all #{system} code"
    task "pep8_#{system}" => report_dir do
        sh("pep8 --ignore=E501 #{system}/djangoapps #{system}/lib | tee #{report_dir}/pep8.report")
    end
    task :pep8 => "pep8_#{system}"

    desc "Run pylint on all #{system} code"
    task "pylint_#{system}" => report_dir do
        Dir["#{system}/djangoapps/*", "#{system}/lib/*"].each do |app|
            if File.exists? "#{app}/setup.py"
                pythonpath_prefix = "PYTHONPATH=#{app}"
            else
                pythonpath_prefix = "PYTHONPATH=#{File.dirname(app)}"
            end
            app = File.basename(app)
            sh("#{pythonpath_prefix} pylint --rcfile=.pylintrc -f parseable #{app} | tee #{report_dir}/#{app}.pylint.report")
        end
    end
    task :pylint => "pylint_#{system}"
end

$failed_tests = 0

def run_tests(system, report_dir, stop_on_failure=true)
    ENV['NOSE_XUNIT_FILE'] = File.join(report_dir, "nosetests.xml")
    ENV['NOSE_COVER_HTML_DIR'] = File.join(report_dir, "cover")
    dirs = Dir["common/djangoapps/*"] + Dir["#{system}/djangoapps/*"]
    sh(django_admin(system, :test, 'test', *dirs.each)) do |ok, res|
        if !ok and stop_on_failure
            abort "Test failed!"
        end
        $failed_tests += 1 unless ok
    end
end

TEST_TASKS = []

[:lms, :cms].each do |system|
    report_dir = File.join(REPORT_DIR, system.to_s)
    directory report_dir

    # Per System tasks
    desc "Run all django tests on our djangoapps for the #{system}"
    task "test_#{system}", [:stop_on_failure] => ["clean_test_files", "#{system}:collectstatic:test", "fasttest_#{system}"]

    # Have a way to run the tests without running collectstatic -- useful when debugging without
    # messing with static files.
    task "fasttest_#{system}", [:stop_on_failure] => [report_dir, :predjango] do |t, args|
        args.with_defaults(:stop_on_failure => 'true')
        run_tests(system, report_dir, args.stop_on_failure)
    end

    TEST_TASKS << "test_#{system}"

    desc <<-desc
        Start the #{system} locally with the specified environment (defaults to dev).
        Other useful environments are devplus (for dev testing with a real local database)
        desc
    task system, [:env, :options] => [:predjango] do |t, args|
        args.with_defaults(:env => 'dev', :options => default_options[system])
        sh(django_admin(system, args.env, 'runserver', args.options))
    end

    # Per environment tasks
    Dir["#{system}/envs/*.py"].each do |env_file|
        env = File.basename(env_file).gsub(/\.py/, '')
        desc "Attempt to import the settings file #{system}.envs.#{env} and report any errors"
        task "#{system}:check_settings:#{env}" => :predjango do
            sh("echo 'import #{system}.envs.#{env}' | #{django_admin(system, env, 'shell')}")
        end

        desc "Run collectstatic in the specified environment"
        task "#{system}:collectstatic:#{env}" => :predjango do
            sh("#{django_admin(system, env, 'collectstatic', '--noinput')}")
        end
    end
end

Dir["common/lib/*"].each do |lib|
    task_name = "test_#{lib}"

    report_dir = File.join(REPORT_DIR, task_name.gsub('/', '_'))
    directory report_dir

    desc "Run tests for common lib #{lib}"
    task task_name => report_dir do
        ENV['NOSE_XUNIT_FILE'] = File.join(report_dir, "nosetests.xml")
        sh("nosetests #{lib} --cover-erase --with-xunit --with-xcoverage --cover-html --cover-inclusive --cover-package #{File.basename(lib)} --cover-html-dir #{File.join(report_dir, "cover")}")
    end
    TEST_TASKS << task_name
end

task :test do
    TEST_TASKS.each do |task|
        Rake::Task[task].invoke(false)
    end

    if $failed_tests > 0
        abort "Tests failed!"
    end
end

task :runserver => :lms

desc "Run django-admin <action> against the specified system and environment"
task "django-admin", [:action, :system, :env, :options] => [:predjango] do |t, args|
    args.with_defaults(:env => 'dev', :system => 'lms', :options => '')
    sh(django_admin(args.system, args.env, args.action, args.options))
end

task :package do
    FileUtils.mkdir_p(BUILD_DIR)

    Dir.chdir(BUILD_DIR) do
        afterremove = Tempfile.new('afterremove')
        afterremove.write <<-AFTERREMOVE.gsub(/^\s*/, '')
        #! /bin/bash
        set -e
        set -x

        # to be a little safer this rm is executed
        # as the makeitso user

        if [[ -d "#{INSTALL_DIR_PATH}" ]]; then
            sudo rm -rf "#{INSTALL_DIR_PATH}"
        fi

        AFTERREMOVE
        afterremove.close()
        FileUtils.chmod(0755, afterremove.path)

        postinstall = Tempfile.new('postinstall')
        postinstall.write <<-POSTINSTALL.gsub(/^\s*/, '')
        #! /bin/sh
        set -e
        set -x


        service gunicorn stop || echo "Unable to stop gunicorn. Continuing"
        rm -f #{LINK_PATH}
        ln -s #{INSTALL_DIR_PATH} #{LINK_PATH}
        chown makeitso:makeitso #{LINK_PATH}

        # install python modules that are in the package
        if [ -r #{PIP_REPO_REQUIREMENTS} ]; then
            cd #{INSTALL_DIR_PATH}
            pip install -r #{PIP_REPO_REQUIREMENTS}
        fi

        chown -R makeitso:makeitso #{INSTALL_DIR_PATH}

        # Delete mako temp files
        rm -rf /tmp/tmp*mako

        service gunicorn start || echo "Unable to start gunicorn. Continuing"
        POSTINSTALL
        postinstall.close()
        FileUtils.chmod(0755, postinstall.path)

        args = ["fakeroot", "fpm", "-s", "dir", "-t", "deb",
            "--after-install=#{postinstall.path}",
            "--after-remove=#{afterremove.path}",
            "--prefix=#{INSTALL_DIR_PATH}",
            "--exclude=**/build/**",
            "--exclude=**/rakefile",
            "--exclude=**/.git/**",
            "--exclude=**/*.pyc",
            "--exclude=**/reports/**",
            "-C", "#{REPO_ROOT}",
            "--provides=#{PACKAGE_NAME}",
            "--name=#{NORMALIZED_DEPLOY_NAME}",
            "--version=#{PKG_VERSION}",
            "-a", "all",
            "."]
        system(*args) || raise("fpm failed to build the .deb")
    end
end

task :publish => :package do
    sh("scp #{BUILD_DIR}/#{NORMALIZED_DEPLOY_NAME}_#{PKG_VERSION}*.deb #{PACKAGE_REPO}")
end

namespace :cms do
  desc "Import course data within the given DATA_DIR variable"
  task :import do
    if ENV['DATA_DIR']
      sh(django_admin(:cms, :dev, :import, ENV['DATA_DIR']))
    else
      raise "Please specify a DATA_DIR variable that point to your data directory.\n" +
        "Example: \`rake cms:import DATA_DIR=../data\`"
    end
  end
end
