{-
Copyright (C) 2022 Yuchen Pei.

This file is part of fsd.

fsd is free software: you can redistribute it and/or modify it under
the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

fsd is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General
Public License for more details.

You should have received a copy of the GNU Affero General Public
License along with fsd.  If not, see <https://www.gnu.org/licenses/>.

-}

{-# LANGUAGE ImportQualifiedPost #-}
{-# LANGUAGE OverloadedStrings #-}

module FSD.Wiki (formatWikiEntry) where

import Data.Maybe
import Data.List.Extra
import Data.Text (Text)
import Data.Text qualified as T
import Data.Time
import FSD.Types

data WikiTemplate = WikiTemplate
  { templateName :: Text,
    templateParams :: [(Text, Text)]
  }

formatTemplate :: WikiTemplate -> Text
formatTemplate (WikiTemplate name params) =
  T.unlines $
    (T.concat ["{{", name]) :
    ( fmap
        (\(key, val) -> T.concat ["|", key, "=", val])
        params
    )
      ++ ["}}"]
-- The main function that formats a PackageInfo to a wiki entry
formatWikiEntry :: PackageInfo -> Text
formatWikiEntry package =
  formatWikiEntry' $
    (wtEntry package) : (wtImport package) : wtLicenses package
    ++ wtPersons package ++ wtResources package

type WikiEntry = [WikiTemplate]

formatWikiEntry' :: WikiEntry -> Text
formatWikiEntry' = T.concat . fmap formatTemplate

-- https://directory.fsf.org/wiki/Template:Entry
wtEntry :: PackageInfo -> WikiTemplate
wtEntry package =
  WikiTemplate "Entry"
  -- this may cause problems some times, like 0ad-data which is a
  -- separate package from 0ad, but with the same upstream name (0ad),
  -- and can cause overwrite of 0ad info
  [ ("Name", fromMaybe (piPackage package) (piUpstreamName package)),
    ("Short description", piShortDesc package),
    ("Full description", piFullDesc package),
    ("Homepage", fromMaybe "" $ piHomepage package),
    ("Computer languages", formatImplLangs package),
    ("Version identifier", piVersion package),
    ("Version download", getDlUrl package),
    ("Submitted by", "Debian import"),
    ("Submitted date", T.pack $ show $ utctDay $ piTimestamp package)
  ]

formatImplLangs :: PackageInfo -> Text
formatImplLangs package =
  T.intercalate "," $ catMaybes $ getLang <$> tagList
  where tags = piTags package
        tagList = filter (\tag -> head tag == "implemented-in") (T.splitOn "::" <$> tags)
        getLang xs = xs !? 1

getDlUrl :: PackageInfo -> Text
getDlUrl package =
  T.concat
    ["http://ftp.debian.org/debian/pool/main/"
    , if T.isPrefixOf "lib" name then T.take 4 name else T.take 1 name
    , "/", name, "/", file]
  where
    name = piPackage package
    file = piFile package

-- TODO
-- https://directory.fsf.org/wiki/Template:Software_category
{-
{{Software category
|Game=game::
|Interface=interface::
|Protocol=protocol::
|Use=use::
...
}}
-}

-- https://directory.fsf.org/wiki/Template:Import
makeLink :: Text -> Text
makeLink name = T.concat ["http://packages.debian.org/stable/", name]

wtImport :: PackageInfo -> WikiTemplate
wtImport package =
  WikiTemplate
    "Import"
    [("Source", "Debian"), ("Source link", makeLink $ piPackage package),
     ("Date", T.pack $ show $ utctDay $ piTimestamp package)]

-- https://directory.fsf.org/wiki/Template:Project_license
wtLicenses :: PackageInfo -> [WikiTemplate]
wtLicenses package =
  wtLicense (piCLAuthor package)
    (T.pack $ show $ utctDay $ piCLTimestamp package) <$>
      (piLicenses package)

wtLicense :: Text -> Text -> LicenseInfo -> WikiTemplate
wtLicense author time info =
  WikiTemplate
    "Project license"
    [ ("License", lLicense info),
      ("License copyright", fromMaybe "" $ lCopyright info),
      ("License verified by", author),
      ("License verified date", time),
      ("License note", fromMaybe "" $ lNote info)
    ]

-- https://directory.fsf.org/wiki/Template:Person
data WTPerson = WTPerson
  { wpName :: Text,
    wpRole :: Text,
    wpEmail :: Text
  }

wtPerson :: Contact -> WikiTemplate
wtPerson (Contact name email) =
  WikiTemplate
    "Person"
    [("Real name", fromMaybe "" name), ("Role", "contact"), ("Email", email)]

wtPersons :: PackageInfo -> [WikiTemplate]
wtPersons info = wtPerson <$> piContacts info

-- https://directory.fsf.org/wiki/Template:Resource
wtResources :: PackageInfo -> [WikiTemplate]
wtResources package =
  (\url -> WikiTemplate "Resource"
    [("Resource kind", "Download"), ("Resource URL", url)]) <$>
      piSources package