module Page.PokedexNumber_ exposing (Data, Model, Msg, page)

import DataSource exposing (DataSource)
import DataSource.Http
import Head
import Head.Seo as Seo
import Html exposing (..)
import Html.Attributes exposing (src)
import OptimizedDecoder as Decode
import Page exposing (Page, PageWithState, StaticPayload)
import PageServerResponse exposing (PageServerResponse)
import Pages.PageUrl exposing (PageUrl)
import Pages.Url
import Secrets
import ServerResponse
import Shared
import View exposing (View)


type alias Model =
    {}


type alias Msg =
    Never


type alias RouteParams =
    { pokedexNumber : String }


page : Page RouteParams Data
page =
    Page.preRenderWithFallback
        { head = head
        , pages = pages
        , data = data
        }
        |> Page.buildNoState { view = view }


pages : DataSource (List RouteParams)
pages =
    DataSource.succeed []


data : RouteParams -> DataSource (PageServerResponse Data)
data { pokedexNumber } =
    let
        asNumber : Int
        asNumber =
            String.toInt pokedexNumber |> Maybe.withDefault -1
    in
    if asNumber < 1 then
        notFoundResponse "Pokedex numbers must be 1 or greater."

    else if asNumber > 898 && asNumber < 10001 || asNumber > 10194 then
        notFoundResponse "The pokedex is empty in that range."

    else
        DataSource.map2 Data
            (DataSource.Http.get (Secrets.succeed "https://elm-pages-pokedex.netlify.app/.netlify/functions/time")
                Decode.string
            )
            (DataSource.Http.get (Secrets.succeed ("https://pokeapi.co/api/v2/pokemon/" ++ pokedexNumber))
                (Decode.map2 Pokemon
                    (Decode.field "forms" (Decode.index 0 (Decode.field "name" Decode.string)))
                    (Decode.field "types" (Decode.list (Decode.field "type" (Decode.field "name" Decode.string))))
                )
            )
            |> DataSource.map PageServerResponse.RenderPage


notFoundResponse : String -> DataSource (PageServerResponse Data)
notFoundResponse message =
    ServerResponse.stringBody ("Not found.\n\n" ++ message)
        |> ServerResponse.withStatusCode 404
        |> PageServerResponse.ServerResponse
        |> DataSource.succeed


type alias Pokemon =
    { name : String
    , abilities : List String
    }


head :
    StaticPayload Data RouteParams
    -> List Head.Tag
head static =
    Seo.summary
        { canonicalUrlOverride = Nothing
        , siteName = "elm-pages Pokedex"
        , image =
            { url = static.routeParams |> pokemonImage |> Pages.Url.external
            , alt = static.data.pokemon.name
            , dimensions = Nothing
            , mimeType = Nothing
            }
        , description = "TODO"
        , locale = Nothing
        , title =
            "Pokedex #"
                ++ static.routeParams.pokedexNumber
                ++ " "
                ++ static.data.pokemon.name
        }
        |> Seo.website


type alias Data =
    { time : String
    , pokemon : Pokemon
    }


view :
    Maybe PageUrl
    -> Shared.Model
    -> StaticPayload Data RouteParams
    -> View Msg
view maybeUrl sharedModel static =
    { title = static.data.pokemon.name
    , body =
        [ h1 []
            [ text static.data.pokemon.name
            ]
        , text (static.data.pokemon.abilities |> String.join ", ")
        , img
            [ static.routeParams |> pokemonImage |> src
            ]
            []
        , p []
            [ text static.data.time
            ]
        ]
    }


pokemonImage : RouteParams -> String
pokemonImage routeParams =
    "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/" ++ routeParams.pokedexNumber ++ ".png"