{-# LANGUAGE QuasiQuotes         #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE ViewPatterns        #-}

-- | This module contains functions for stack template creation.

module Summoner.Template
       ( createStackTemplate
       ) where

import Universum

import Data.List (delete)
import NeatInterpolation (text)

import Summoner.Default (defaultGHC, endLine)
import Summoner.ProjectData (CustomPrelude (..), GhcVer (..), ProjectData (..), baseNopreludeVer,
                             latestLts, showGhcVer)
import Summoner.Text (intercalateMap, packageToModule)
import Summoner.Tree (TreeFs (..))

import qualified Data.Text as T

----------------------------------------------------------------------------
-- Stack File Creation
----------------------------------------------------------------------------

emptyIfNot :: Monoid m => Bool -> m -> m
emptyIfNot p val = if p then val else mempty

-- | Creating template file to use in `stack new` command
createStackTemplate :: ProjectData ->  TreeFs
createStackTemplate ProjectData{..} = Dir (toString repo) $
    [ File (toString repo <> ".cabal")
           ( createCabalTop
          <> emptyIfNot github createCabalGit
          <> emptyIfNot isLib createCabalLib
          <> emptyIfNot isExe
                        ( createCabalExe
                        $ emptyIfNot isLib $ ", " <> repo )
          <> emptyIfNot test createCabalTest
          <> emptyIfNot bench
                        ( createCabalBenchmark
                        $ emptyIfNot isLib $ ", " <> repo )
           )
    , File "README.md" readme
    , File "CHANGELOG.md" changelog
    , File "LICENSE" licenseText
    ]
 ++ createCabalFiles
 ++ emptyIfNot stack (createStackYamls testedVersions)
 ++ [File ".gitignore" gitignore | github]
 ++ [File ".travis.yml" travisYml | travis]
 ++ [File "appveyor.yml" appVeyorYml | appVey]
 ++ [File "b" scriptSh | script]
  where
    -- Creates module name from the name of the project
    libModuleName :: Text
    libModuleName = packageToModule repo

    preludeMod :: Text
    preludeMod = case prelude of
        Nothing -> ""
        Just _  -> "Prelude"

    customPreludePack :: Text
    customPreludePack = case prelude of
        Nothing          -> ""
        Just Prelude{..} -> ", " <> cpPackage

    -- all basic project information for `*.cabal` file
    createCabalTop :: Text
    createCabalTop =
        [text|
        name:                $repo
        version:             0.0.0
        description:         $description
        synopsis:            $description
        homepage:            https://github.com/${owner}/${repo}
        bug-reports:         https://github.com/${owner}/${repo}/issues
        license:             $license
        license-file:        LICENSE
        author:              $nm
        maintainer:          $email
        copyright:           $year $nm
        category:            $category
        build-type:          Simple
        extra-doc-files:     README.md
                           , CHANGELOG.md
        cabal-version:       1.24
        tested-with:         $testedGhcs
        $endLine
        |]

    testedGhcs :: Text
    testedGhcs = intercalateMap ", " (mappend "GHC == " . showGhcVer) testedVersions

    defaultExtensions :: Text
    defaultExtensions = case extensions of
        [] -> ""
        xs -> "default-extensions:  " <> T.intercalate "\n                     " xs

    createCabalGit :: Text
    createCabalGit =
        [text|
        source-repository head
          type:                git
          location:            https://github.com/${owner}/${repo}.git
        $endLine
        |]

    createCabalLib :: Text
    createCabalLib =
        [text|
        library
          hs-source-dirs:      src
          exposed-modules:     $libModuleName
                               $preludeMod
          ghc-options:         -Wall
          build-depends:       $base
                             $customPreludePack
          default-language:    Haskell2010
          $defaultExtensions
        $endLine
        |]

    createCabalExe :: Text -> Text
    createCabalExe r =
        [text|
        executable $repo
          hs-source-dirs:      app
          main-is:             Main.hs
          ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
          build-depends:       $base
                             $r
                             $customPreludePack
          default-language:    Haskell2010
          $defaultExtensions
        $endLine
        |]

    createCabalTest :: Text
    createCabalTest =
        [text|
        test-suite ${repo}-test
          type:                exitcode-stdio-1.0
          hs-source-dirs:      test
          main-is:             Spec.hs
          build-depends:       $base
                             , $repo
                             $customPreludePack
          ghc-options:         -Wall -Werror -threaded -rtsopts -with-rtsopts=-N
          default-language:    Haskell2010
          $defaultExtensions
        $endLine
        |]

    createCabalBenchmark :: Text -> Text
    createCabalBenchmark r =
        [text|
        benchmark ${repo}-benchmark
          type:                exitcode-stdio-1.0
          default-language:    Haskell2010
          ghc-options:         -Wall -Werror -O2 -threaded -rtsopts -with-rtsopts=-N
          hs-source-dirs:      benchmark
          main-is:             Main.hs
          build-depends:       $base
                             , gauge
                             $customPreludePack
                             $r
          $defaultExtensions
        $endLine
        |]

    createCabalFiles :: [TreeFs]
    createCabalFiles =
        [ Dir "app"       [exeFile]               | isExe ]
     ++ [ Dir "test"      [testFile]              | test  ]
     ++ [ Dir "benchmark" [benchmarkFile]         | bench ]
     ++ [ Dir "src"       $ libFile : preludeFile | isLib ]

    testFile :: TreeFs
    testFile = File "Spec.hs"
        [text|
        main :: IO ()
        main = putStrLn ("Test suite not yet implemented" :: String)
        $endLine
        |]

    libFile :: TreeFs
    libFile = File (toString libModuleName <> ".hs")
        [text|
        module $libModuleName
               ( someFunc
               ) where

        someFunc :: IO ()
        someFunc = putStrLn ("someFunc" :: String)
        $endLine
        |]

    preludeFile :: [TreeFs]
    preludeFile = case prelude of
        Nothing -> []
        Just Prelude{..} -> one $ File "Prelude.hs"
            [text|
            -- | Uses [$cpPackage](https://hackage.haskell.org/package/${cpPackage}) as default Prelude.

            module Prelude
                   ( module $cpModule
                   ) where

            import $cpModule
            $endLine
            |]

    exeFile :: TreeFs
    exeFile = File "Main.hs" $ if isLib then createExe else createOnlyExe

    createOnlyExe :: Text
    createOnlyExe =
        [text|
        module Main where

        main :: IO ()
        main = putStrLn ("Hello, world!" :: String)
        $endLine
        |]

    createExe :: Text
    createExe =
        [text|
        module Main where

        import $libModuleName (someFunc)

        main :: IO ()
        main = someFunc
        $endLine
        |]

    benchmarkFile :: TreeFs
    benchmarkFile = File "Main.hs"
      [text|
      import Gauge.Main

      main :: IO ()
      main = defaultMain [bench "const" (whnf const ())]
      $endLine
      |]

    -- create README template
    readme :: Text
    readme =
        [text|
        # $repo

        [![Hackage]($hackageShield)]($hackageLink)
        [![$license license](${licenseShield})](${licenseLink})
        $travisBadge
        $appVeyorBadge

        $description
        $endLine
        |]
      where
        hackageShield :: Text =
          "https://img.shields.io/hackage/v/" <> repo <> ".svg"
        hackageLink :: Text =
          "https://hackage.haskell.org/package/" <> repo

        travisShield :: Text =
          "https://secure.travis-ci.org/" <> owner <> "/" <> repo <> ".svg"
        travisLink :: Text =
          "https://travis-ci.org/" <> owner <> "/" <> repo
        travisBadge :: Text = emptyIfNot travis
            [text|[![Build status](${travisShield})](${travisLink})|]

        appVeyorShield :: Text =
          "https://ci.appveyor.com/api/projects/status/github/" <> owner <> "/" <> repo <> "?branch=master&svg=true"
        appVeyorLink :: Text =
          "https://ci.appveyor.com/project/" <> owner <> "/" <> repo
        appVeyorBadge :: Text = emptyIfNot appVey
            [text|[![Windows build status](${appVeyorShield})](${appVeyorLink})|]

        licenseShield :: Text =
          "https://img.shields.io/badge/license-" <> T.replace "-" "--" license <> "-blue.svg"
        licenseLink :: Text =
          "https://github.com/" <> owner <> "/" <> repo <> "/blob/master/LICENSE"

    -- create .gitignore template
    gitignore :: Text
    gitignore =
        [text|
        ### Haskell
        dist
        dist-*
        cabal-dev
        *.o
        *.hi
        *.chi
        *.chs.h
        *.dyn_o
        *.dyn_hi
        *.prof
        *.aux
        *.hp
        *.eventlog
        .virtualenv
        .hsenv
        .hpc
        .cabal-sandbox/
        cabal.sandbox.config
        cabal.config
        cabal.project.local
        .ghc.environment.*
        .HTF/
        # Stack
        .stack-work/

        ### IDE/support
        # Vim
        [._]*.s[a-v][a-z]
        [._]*.sw[a-p]
        [._]s[a-v][a-z]
        [._]sw[a-p]
        *~
        tags

        # IntellijIDEA
        .idea/
        .ideaHaskellLib/
        *.iml

        # Atom
        .haskell-ghc-mod.json

        # VS
        .vscode/

        # Emacs
        *#
        .dir-locals.el
        TAGS

        # other
        .DS_Store
        $endLine
        |]

    -- create CHANGELOG template
    changelog :: Text
    changelog =
        [text|
        Change log
        ==========

        $repo uses [PVP Versioning][1].
        The change log is available [on GitHub][2].

        0.0.0
        =====
        * Initially created.

        [1]: https://pvp.haskell.org
        [2]: https://github.com/${owner}/${repo}/releases
        $endLine
        |]

    -- create travis.yml template
    travisYml :: Text
    travisYml =
        let travisStackMtr = emptyIfNot stack $
                T.concat (map travisStackMatrixItem $ delete defaultGHC testedVersions)
                    <> travisStackMatrixDefaultItem
            travisCabalMtr = emptyIfNot cabal $
                T.concat $ map travisCabalMatrixItem testedVersions
            installAndScript =
                if cabal
                then if stack
                     then installScriptBoth
                     else installScriptCabal
                else installScriptStack
        in
        [text|
        sudo: true
        language: haskell

        git:
          depth: 5

        cache:
          directories:
          - "$$HOME/.stack"
          - "$$TRAVIS_BUILD_DIR/.stack-work"

        matrix:
          include:

          $travisCabalMtr
          $travisStackMtr

        $installAndScript

        notifications:
          email: false
        $endLine
        |]

    cabalTest :: Text
    cabalTest = if test then "cabal new-test" else "echo 'No tests'"

    travisCabalMatrixItem :: GhcVer -> Text
    travisCabalMatrixItem (showGhcVer -> ghcV) =
        [text|
        - ghc: ${ghcV}
          env: GHCVER='${ghcV}' CABALVER='head'
          os: linux
          addons:
            apt:
              sources:
              - hvr-ghc
              packages:
              - ghc-${ghcV}
              - cabal-install-head
        $endLine
        |]

    travisStackMatrixItem :: GhcVer -> Text
    travisStackMatrixItem (showGhcVer -> ghcV) =
        [text|
        - ghc: ${ghcV}
          env: GHCVER='${ghcV}' STACK_YAML="$$TRAVIS_BUILD_DIR/stack-$$GHCVER.yaml"
          os: linux
          addons:
            apt:
              packages:
              - libgmp-dev
          $endLine
        |]

    travisStackMatrixDefaultItem :: Text
    travisStackMatrixDefaultItem = let defGhc = showGhcVer defaultGHC in
        [text|
        - ghc: ${defGhc}
          env: GHCVER='${defGhc}' STACK_YAML="$$TRAVIS_BUILD_DIR/stack.yaml"
          os: linux
          addons:
            apt:
              packages:
              - libgmp-dev
        $endLine
        |]

    installScriptBoth :: Text
    installScriptBoth =
        [text|
        install:
          - |
            if [ -z "$$STACK_YAML" ]; then
              export PATH="/opt/ghc/$$GHCVER/bin:/opt/cabal/$$CABALVER/bin:$$PATH"
              echo $$PATH
              cabal new-update
              cabal new-build --enable-tests --enable-benchmarks
            else
              mkdir -p ~/.local/bin
              export PATH="$$HOME/.local/bin:$$PATH"
              travis_retry curl -L 'https://www.stackage.org/stack/linux-x86_64' | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
              stack --version
              stack setup --no-terminal --install-cabal 2.0.1.0
              stack ghc -- --version
              stack build --only-dependencies --no-terminal
            fi
        script:
          - |
            if [ -z "$$STACK_YAML" ]; then
               ${cabalTest}
            else
              stack build --test --bench --no-run-benchmarks --no-terminal
            fi
        $endLine
        |]

    installScriptCabal :: Text
    installScriptCabal =
        [text|
        install:
          - export PATH="/opt/ghc/$$GHCVER/bin:/opt/cabal/$$CABALVER/bin:$$PATH"
          - echo $$PATH
          - cabal new-update
          - cabal new-build --enable-tests --enable-benchmarks
        script:
          - ${cabalTest}
        $endLine
        |]

    installScriptStack :: Text
    installScriptStack =
        [text|
        install:
          - mkdir -p ~/.local/bin
          - export PATH="$$HOME/.local/bin:$$PATH"
          - travis_retry curl -L 'https://www.stackage.org/stack/linux-x86_64' | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
          - stack --version
          - stack setup --no-terminal --install-cabal 2.0.1.0
          - stack ghc -- --version
          - stack build --only-dependencies --no-terminal
        script:
          - stack build --test --bench --no-run-benchmarks --no-terminal
        $endLine
        |]

    -- create @stack.yaml@ file with LTS corresponding to specified ghc version
    createStackYamls :: [GhcVer] -> [TreeFs]
    createStackYamls = map createStackYaml
      where
        createStackYaml :: GhcVer -> TreeFs
        createStackYaml ghcV = let ver = case ghcV of
                                      Ghc843 -> ""
                                      _      -> "-" <> showGhcVer ghcV
            in stackYaml ver (latestLts ghcV) (baseNopreludeVer ghcV)
          where
            stackYaml :: Text -> Text -> Text -> TreeFs
            stackYaml ghc lts baseVer = File (toString $ "stack" <> ghc <> ".yaml")
                [text|
                resolver: lts-${lts}

                $extraDeps

                $ghcOpts
                $endLine
                |]
              where
                extraDeps :: Text
                extraDeps = case prelude of
                    Nothing -> ""
                    Just _  -> "extra-deps: [base-noprelude-" <> baseVer <> "]"
                ghcOpts :: Text
                ghcOpts = if ghcV <= Ghc802 then
                            ""
                          else
                            [text|
                            ghc-options:
                              "$$locals": -fhide-source-paths
                            |]


    -- create appveyor.yml template
    appVeyorYml :: Text
    appVeyorYml =
        [text|
        build: off

        before_test:
        # http://help.appveyor.com/discussions/problems/6312-curl-command-not-found
        - set PATH=C:\Program Files\Git\mingw64\bin;%PATH%

        - curl -sS -ostack.zip -L --insecure http://www.stackage.org/stack/windows-i386
        - 7z x stack.zip stack.exe

        clone_folder: "c:\\stack"
        environment:
          global:
            STACK_ROOT: "c:\\sr"

        test_script:
        - stack setup > nul
        # The ugly echo "" hack is to avoid complaints about 0 being an invalid file
        # descriptor
        - echo "" | stack --no-terminal build --bench --no-run-benchmarks --test
        |]

    scriptSh :: Text
    scriptSh =
        [text|
        #!/usr/bin/env bash
        set -e

        # DESCRIPTION
        # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        # This script builds the project in a way that is convenient for developers.
        # It passes the right flags into right places, builds the project with --fast,
        # tidies up and highlights error messages in GHC output.

        # USAGE
        # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        #   ./b                 build whole project with all targets
        #   ./b -c              do stack clean
        #   ./b -t              build and run tests
        #   ./b -b              build and run benchmarks
        #   ./b --nix           use nix to build package

        args=''
        test=false
        bench=false
        with_nix=false
        clean=false

        for var in "$$@"
        do
          # -t = run tests
          if [[ $$var == "-t" ]]; then
            test=true
          # -b = run benchmarks
          elif [[ $$var == "-b" ]]; then
            bench=true
          elif [[ $$var == "--nix" ]]; then
            with_nix=true
          # -c = clean
          elif [[ $$var == "-c" ]]; then
            clean=true
          else
            args="$$args $$var"
          fi
        done

        # Cleaning project
        if [[ $$clean == true ]]; then
          echo "Cleaning project..."
          stack clean
          exit
        fi

        if [[ $$no_nix == true ]]; then
          args="$$args --nix"
        fi

        xperl='$|++; s/(.*) Compiling\s([^\s]+)\s+\(\s+([^\/]+).*/\1 \2/p'
        xgrep="((^.*warning.*$|^.*error.*$|^    .*$|^.*can't find source.*$|^Module imports form a cycle.*$|^  which imports.*$)|^)"

        stack build $$args                                    \
                    --ghc-options="+RTS -A256m -n2m -RTS"    \
                    --test                                   \
                    --no-run-tests                           \
                    --no-haddock-deps                        \
                    --bench                                  \
                    --no-run-benchmarks                      \
                    --jobs=4                                 \
                    --dependencies-only

        stack build $$args                                    \
                    --fast                                   \
                    --ghc-options="+RTS -A256m -n2m -RTS"    \
                    --test                                   \
                    --no-run-tests                           \
                    --no-haddock-deps                        \
                    --bench                                  \
                    --no-run-benchmarks                      \
                    --jobs=4 2>&1 | perl -pe "$$xperl" | { grep -E --color "$$xgrep" || true; }

        if [[ $$test == true ]]; then
          stack build $$args                                  \
                      --fast                                 \
                      --ghc-options="+RTS -A256m -n2m -RTS"  \
                      --test                                 \
                      --no-haddock-deps                      \
                      --bench                                \
                      --no-run-benchmarks                    \
                      --jobs=4
        fi

        if [[ $$bench == true ]]; then
          stack build $$args                                  \
                      --fast                                 \
                      --ghc-options="+RTS -A256m -n2m -RTS"  \
                      --test                                 \
                      --no-run-tests                         \
                      --no-haddock-deps                      \
                      --bench                                \
                      --jobs=4
        fi
        $endLine
        |]