module Build exposing ( main )

import About.Layout
import Bytes exposing ( Bytes )
import Bytes.Decode
import Bytes.Encode
import Dict
import Json.Encode
import Markdown
import Shikensu
import Shikensu.Bundle as Bundle
import Shikensu.Contrib as Shikensu
import Shikensu.Definition as Definition
import Shikensu.Focus exposing ( Focus(..) )
import Shikensu.Path as Path exposing (..)
import Shikensu.Path.Encapsulated as Path.Encapsulated
import Task
import Transmutable.Html



-- | (• ◡•)| (❍ᴥ❍ʋ)


main =
    Shikensu.programs
        [ -- Copy static files to dist
          copy (staticDir "Favicons")
        , copy (staticDir "Hosting")
        , copyInto "fonts" (staticDir "Fonts")
        , copyInto "images" (staticDir "Images")

        , -- Copy more static files with some alterations
          copyWithAlterations
            { focus = staticDir "Html"
            , alt = Shikensu.rename (filePath "Application.html") (filePath "index.html")
            }
        , copyWithAlterations
            { focus = staticDir "Manifests"
            , alt = Shikensu.rename (filePath "manifest.json") (filePath "site.webmanifest")
            }

        , -- Render about pages
          about

        , -- Make a file tree so the service worker knows what to cache
          tree
        ]



-- FOCUSES & PATHS


dist =
    Relative
        (Path.directory
            [ "dist"
            ]
        )


filePath path =
    path
        |> Path.fromPosix
        |> Path.Encapsulated.toFile
        |> Maybe.withDefault (Path.file (Array.singleton path))


staticDir dirName =
    Relative
        (Path.directory
            [ "src"
            , "Static"
            , dirName
            ]
        )



-- PROGRAMS


about =
    { focus = staticDir "About"
    , sequence = read >> Task.map aboutAlts >> write
    }


copy focus =
    { focus = focus
    , sequence = read >> write
    }


copyInto dirName focus =
    { focus = focus
    , sequence = read >> Task.map (prefixDirname dirName) >> write
    }


copyWithAlterations { focus, alt } =
    { focus = focus
    , sequence = read >> Task.map alt >> write
    }


tree =
    { focus = dist
    , sequence =
        Task.map
            (\bundle ->
                bundle.compendium
                    |> Array.map
                            (\def ->
                                def
                                    |> Definition.relativePath
                                    |> Path.toPosix
                                            { absolute = False
                                            }
                            )
                    |> Array.filter (String.contains "images/Background/" >> (==) False)
                    |> Json.Encode.array Json.Encode.string
                    |> Json.Encode.encode 0
                    |> stringToBytes
                    |> (\content ->
                            { baseName = "tree"
                            , content = Just content
                            , directoryPath = Path.directory []
                            , extensionName = Just "json"
                            , metadata = Dict.empty
                            }
                        )
                    |> (\def ->
                            { bundle
                                | compendium =
                                    [ def
                                    ]
                            }
                        )
            )
            >> write
    }



-- ALTERATIONS


aboutAlts bundle =
    bundle
        |> Shikensu.withExtension "md"
        |> lowerCasePath
        |> prefixDirname "about"
        |> Shikensu.renameExtension "md" "html"
        |> Shikensu.permalink "index"
        |> Shikensu.renderContent
                (\def ->
                    def.content
                        |> Maybe.andThen bytesToString
                        |> Maybe.withDefault ""
                        |> Markdown.parse
                                { frontmatter = Nothing
                                }
                        |> (\{ blocks } -> Array.map Markdown.toHtml blocks)
                        |> About.Layout.layout
                                { pathToRoot =
                                    def.directoryPath
                                        |> Path.unwrap
                                        |> Array.map (\_ -> "..")
                                        |> String.join "/"
                                        |> (\a -> a ++ "/")
                                }
                        |> Transmutable.Html.arrayToString
                        |> stringToBytes
                        |> Just
                )


lowerCasePath =
    (\def ->
        def
            |> Definition.relativePath
            |> Path.map (Array.map String.toLower)
            |> (\path -> Definition.fork path def)
    )
        |> Array.map
        |> Bundle.mapCompendium


prefixDirname dirName =
    (\def -> { def | directoryPath = Path.map (Array.pushFirst dirName) def.directoryPath })
        |> Array.map
        |> Bundle.mapCompendium



-- TASKS


read =
    Task.andThen Shikensu.read


write =
    Task.andThen (Shikensu.write dist)



-- 🛠️


bytesToString : Bytes -> Maybe String
bytesToString bytes =
    bytes
        |> Bytes.width
        |> Bytes.Decode.string
        |> (\decoder -> Bytes.Decode.decode decoder bytes)


stringToBytes : String -> Bytes
stringToBytes =
    Bytes.Encode.string >> Bytes.Encode.encode