module Api exposing (routes)

import ApiRoute
import Article
import DataSource exposing (DataSource)
import DataSource.Http
import Head
import Html exposing (Html)
import Json.Decode as Decode
import Json.Encode
import Manifest
import Pages
import Pages.Manifest
import Route exposing (Route)
import Rss
import Site
import SiteOld
import Sitemap
import Time


routes :
    DataSource (List Route)
    -> (Maybe { indent : Int, newLines : Bool } -> Html Never -> String)
    -> List (ApiRoute.ApiRoute ApiRoute.Response)
routes getStaticRoutes htmlToString =
    [ ApiRoute.succeed
        (\userId ->
            DataSource.succeed
                (Json.Encode.object
                    [ ( "id", Json.Encode.string userId )
                    , ( "name"
                      , Html.p [] [ Html.text <| "Data for user " ++ userId ]
                            |> htmlToString Nothing
                            |> Json.Encode.string
                      )
                    ]
                    |> Json.Encode.encode 2
                )
        )
        |> ApiRoute.literal "users"
        |> ApiRoute.slash
        |> ApiRoute.capture
        |> ApiRoute.literal ".json"
        |> ApiRoute.preRender
            (\route ->
                DataSource.succeed
                    [ route "1"
                    , route "2"
                    , route "3"
                    ]
            )
    , ApiRoute.succeed
        (\repoName ->
            DataSource.Http.get
                ("https://api.github.com/repos/dillonkearns/" ++ repoName)
                (Decode.field "stargazers_count" Decode.int)
                |> DataSource.map
                    (\stars ->
                        Json.Encode.object
                            [ ( "repo", Json.Encode.string repoName )
                            , ( "stars", Json.Encode.int stars )
                            ]
                            |> Json.Encode.encode 2
                    )
        )
        |> ApiRoute.literal "repo"
        |> ApiRoute.slash
        |> ApiRoute.capture
        |> ApiRoute.literal ".json"
        |> ApiRoute.preRender
            (\route ->
                DataSource.succeed
                    [ route "elm-graphql"
                    ]
            )
    , rss
        { siteTagline = SiteOld.tagline
        , siteUrl = SiteOld.canonicalUrl
        , title = "elm-pages Blog"
        , builtAt = Pages.builtAt
        , indexPage = [ "blog" ]
        }
        postsDataSource
    , ApiRoute.succeed
        (getStaticRoutes
            |> DataSource.map
                (\allRoutes ->
                    allRoutes
                        |> List.map
                            (\route ->
                                { path = Route.routeToPath route |> String.join "/"
                                , lastMod = Nothing
                                }
                            )
                        |> Sitemap.build { siteUrl = "https://elm-pages.com" }
                )
        )
        |> ApiRoute.literal "sitemap.xml"
        |> ApiRoute.single
        |> ApiRoute.withGlobalHeadTags (DataSource.succeed [ Head.sitemapLink "/sitemap.xml" ])
    , Pages.Manifest.generator Site.canonicalUrl Manifest.config
    ]


postsDataSource : DataSource.DataSource (List Rss.Item)
postsDataSource =
    Article.allMetadata
        |> DataSource.map
            (List.map
                (\( route, article ) ->
                    { title = article.title
                    , description = article.description
                    , url =
                        route
                            |> Route.routeToPath
                            |> String.join "/"
                    , categories = []
                    , author = "Dillon Kearns"
                    , pubDate = Rss.Date article.published
                    , content = Nothing
                    , contentEncoded = Nothing
                    , enclosure = Nothing
                    }
                )
            )


rss :
    { siteTagline : String
    , siteUrl : String
    , title : String
    , builtAt : Time.Posix
    , indexPage : List String
    }
    -> DataSource.DataSource (List Rss.Item)
    -> ApiRoute.ApiRoute ApiRoute.Response
rss options itemsRequest =
    ApiRoute.succeed
        (itemsRequest
            |> DataSource.map
                (\items ->
                    Rss.generate
                        { title = options.title
                        , description = options.siteTagline
                        , url = options.siteUrl ++ "/" ++ String.join "/" options.indexPage
                        , lastBuildTime = options.builtAt
                        , generator = Just "elm-pages"
                        , items = items
                        , siteUrl = options.siteUrl
                        }
                )
        )
        |> ApiRoute.literal "blog/feed.xml"
        |> ApiRoute.single
        |> ApiRoute.withGlobalHeadTags
            (DataSource.succeed
                [ Head.rssLink "/blog/feed.xml"
                ]
            )