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module Habits exposing (render)

import Browser
import Date exposing (Date)
import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events exposing (..)
import Set exposing (Set)
import State exposing (HabitType(..))
import Time exposing (Weekday(..))
import UI
import Utils exposing (Strategy(..))


morning : List State.Habit
morning =
    List.map
        (\( duration, x ) ->
            { label = x
            , habitType = State.Morning
            , minutesDuration = duration
            }
        )
        [ ( 1, "Make bed" )
        , ( 2, "Brush teeth" )
        , ( 30, "Run (15 minutes)" )
        , ( 10, "Shower" )
        , ( 10, "Meditate" )
        ]


evening : List State.Habit
evening =
    List.map
        (\( duration, x ) ->
            { label = x
            , habitType = State.Evening
            , minutesDuration = duration
            }
        )
        [ ( 30, "Read" )
        , ( 1, "Record in habit Journal" )
        ]


monday : List ( Int, String )
monday =
    [ ( 90, "Bikram Yoga @ 17:00" )
    ]


tuesday : List ( Int, String )
tuesday =
    [ ( 90, "Bikram Yoga @ 18:00" )
    ]


wednesday : List ( Int, String )
wednesday =
    [ ( 5, "Shave" )
    , ( 90, "Bikram Yoga @ 17:00" )
    ]


thursday : List ( Int, String )
thursday =
    []


friday : List ( Int, String )
friday =
    [ ( 60, "Bikram Yoga @ 17:00" )
    , ( 3, "Take-out trash" )
    , ( 60, "Shop for groceries" )
    ]


saturday : List ( Int, String )
saturday =
    [ ( 60, "Warm Yin Yoga @ 15:00" )
    ]


sunday : List ( Int, String )
sunday =
    [ ( 1, "Shampoo" )
    , ( 5, "Shave" )
    , ( 1, "Trim nails" )
    , ( 1, "Combine trash cans" )
    , ( 10, "Mop tile and wood floors" )
    , ( 10, "Laundry" )
    , ( 5, "Vacuum bedroom" )
    , ( 5, "Clean desk" )
    ]


payday : List State.Habit
payday =
    List.map
        (\( duration, x ) ->
            { label = x
            , habitType = State.Payday
            , minutesDuration = duration
            }
        )
        [ ( 1, "Ensure \"Emergency\" fund has a balance of 1000 GBP" )
        , ( 1, "Open \"finances_2020\" Google Sheet" )
        , ( 1, "Settle up with Mimi on TransferWise" )
        , ( 1, "Adjust GBP:USD exchange rate" )
        , ( 1, "Adjust \"Stocks (after tax)\" to reflect amount Google sent" )
        , ( 1, "Add remaining cash to \"Carryover (cash)\"" )
        , ( 1, "Adjust \"Paycheck\" to reflect amount Google sent" )
        , ( 5, "In the \"International Xfer\" table, send \"Xfer amount\" from Monzo to USAA" )
        , ( 10, "Go to an ATM and extract the amount in \"ATM withdrawal\"" )
        , ( 0, "Await the TransferWise transaction to complete and pay MyFedLoan in USD" )
        ]


firstOfTheMonth : List State.Habit
firstOfTheMonth =
    List.map
        (\( duration, x ) ->
            { label = x
            , habitType = State.FirstOfTheMonth
            , minutesDuration = duration
            }
        )
        [ ( 10, "Create habit template in journal" )
        , ( 30, "Assess previous month's performance" )
        , ( 5, "Register for Bikram Yoga classes" )
        ]


firstOfTheYear : List State.Habit
firstOfTheYear =
    List.map
        (\( duration, x ) ->
            { label = x
            , habitType = State.FirstOfTheYear
            , minutesDuration = duration
            }
        )
        [ ( 60, "Write a post mortem for the previous year" )
        ]


habitTypes :
    { includeMorning : Bool
    , includeEvening : Bool
    , date : Date
    }
    -> List State.HabitType
habitTypes { includeMorning, includeEvening, date } =
    let
        habitTypePredicates : List ( State.HabitType, Date -> Bool )
        habitTypePredicates =
            [ ( Morning, \_ -> includeMorning )
            , ( DayOfWeek, \_ -> True )
            , ( Payday, \x -> Date.day x == 25 )
            , ( FirstOfTheMonth, \x -> Date.day x == 1 )
            , ( FirstOfTheYear, \x -> Date.day x == 1 && Date.monthNumber x == 1 )
            , ( Evening, \_ -> includeEvening )
            ]
    in
    habitTypePredicates
        |> List.filter (\( _, predicate ) -> predicate date)
        |> List.map (\( habitType, _ ) -> habitType)


habitsFor : State.HabitType -> Weekday -> List State.Habit
habitsFor habitType weekday =
    case habitType of
        Morning ->
            morning

        Evening ->
            evening

        DayOfWeek ->
            let
                toHabit : List ( Int, String ) -> List State.Habit
                toHabit =
                    List.map
                        (\( duration, x ) ->
                            { label = x
                            , habitType = State.DayOfWeek
                            , minutesDuration = duration
                            }
                        )
            in
            case weekday of
                Mon ->
                    toHabit monday

                Tue ->
                    toHabit tuesday

                Wed ->
                    toHabit wednesday

                Thu ->
                    toHabit thursday

                Fri ->
                    toHabit friday

                Sat ->
                    toHabit saturday

                Sun ->
                    toHabit sunday

        Payday ->
            payday

        FirstOfTheMonth ->
            firstOfTheMonth

        FirstOfTheYear ->
            firstOfTheYear


weekdayLabelFor : Weekday -> State.WeekdayLabel
weekdayLabelFor weekday =
    case weekday of
        Mon ->
            "Monday"

        Tue ->
            "Tuesday"

        Wed ->
            "Wednesday"

        Thu ->
            "Thursday"

        Fri ->
            "Friday"

        Sat ->
            "Saturday"

        Sun ->
            "Sunday"


timeRemaining : State.WeekdayLabel -> State.CompletedHabits -> List State.Habit -> Int
timeRemaining weekdayLabel completed habits =
    habits
        |> List.indexedMap
            (\i { label, minutesDuration } ->
                if Set.member ( weekdayLabel, label ) completed then
                    0

                else
                    minutesDuration
            )
        |> List.sum


render : State.Model -> Html State.Msg
render { today, visibleDayOfWeek, completed, includeMorning, includeEvening } =
    case ( today, visibleDayOfWeek ) of
        ( Just todaysDate, Just visibleWeekday ) ->
            let
                todaysWeekday : Weekday
                todaysWeekday =
                    Date.weekday todaysDate

                habits : List State.Habit
                habits =
                    habitTypes
                        { includeMorning = includeMorning
                        , includeEvening = includeEvening
                        , date = todaysDate
                        }
                        |> List.map (\habitType -> habitsFor habitType todaysWeekday)
                        |> List.concat
            in
            div
                [ Utils.class
                    [ Always "max-w-xl mx-auto py-6 px-6"
                    , When (todaysWeekday /= visibleWeekday) "pt-20"
                    ]
                ]
                [ header []
                    [ if todaysWeekday /= visibleWeekday then
                        div [ class "text-center w-full bg-blue-600 text-white fixed top-0 left-0 px-3 py-4" ]
                            [ p [ class "py-2 inline pr-5" ]
                                [ text "As you are not viewing today's habits, the UI is in read-only mode" ]
                            , UI.button
                                [ class "bg-blue-200 px-4 py-2 rounded text-blue-600 text-xs font-bold"
                                , onClick State.ViewToday
                                ]
                                [ text "View Today's Habits" ]
                            ]

                      else
                        text ""
                    , div [ class "flex center" ]
                        [ UI.button
                            [ class "w-1/4 text-gray-500"
                            , onClick State.ViewPrevious
                            ]
                            [ text "‹ previous" ]
                        , h1 [ class "font-bold text-blue-500 text-3xl text-center w-full" ]
                            [ text (weekdayLabelFor visibleWeekday) ]
                        , UI.button
                            [ class "w-1/4 text-gray-500"
                            , onClick State.ViewNext
                            ]
                            [ text "next ›" ]
                        ]
                    ]
                , if todaysWeekday == visibleWeekday then
                    p [ class "text-center pt-1 pb-4" ]
                        [ let
                            t : Int
                            t =
                                timeRemaining (weekdayLabelFor todaysWeekday) completed habits
                          in
                          if t == 0 then
                            text "Nothing to do!"

                          else
                            text
                                ((habits
                                    |> timeRemaining (weekdayLabelFor todaysWeekday) completed
                                    |> String.fromInt
                                 )
                                    ++ " minutes remaining"
                                )
                        ]

                  else
                    text ""
                , if todaysWeekday == visibleWeekday then
                    div []
                        [ UI.button
                            [ onClick
                                (if Set.size completed == 0 then
                                    State.DoNothing

                                 else
                                    State.ClearAll
                                )
                            , Utils.class
                                [ Always "ml-10 px-3"
                                , If (Set.size completed == 0)
                                    "text-gray-500 cursor-not-allowed"
                                    "text-red-500 underline cursor-pointer"
                                ]
                            ]
                            [ let
                                numCompleted : Int
                                numCompleted =
                                    habits
                                        |> List.indexedMap (\i { label } -> ( i, label ))
                                        |> List.filter
                                            (\( i, label ) ->
                                                Set.member
                                                    ( weekdayLabelFor todaysWeekday, label )
                                                    completed
                                            )
                                        |> List.length
                              in
                              if numCompleted == 0 then
                                text "Clear"

                              else
                                text ("Clear (" ++ String.fromInt numCompleted ++ ")")
                            ]
                        , UI.button
                            [ onClick State.ToggleMorning
                            , Utils.class
                                [ Always "px-3 underline"
                                , If includeMorning
                                    "text-gray-600"
                                    "text-blue-600"
                                ]
                            ]
                            [ text
                                (if includeMorning then
                                    "Hide Morning"

                                 else
                                    "Show Morning"
                                )
                            ]
                        , UI.button
                            [ Utils.class
                                [ Always "px-3 underline"
                                , If includeEvening
                                    "text-gray-600"
                                    "text-blue-600"
                                ]
                            , onClick State.ToggleEvening
                            ]
                            [ text
                                (if includeEvening then
                                    "Hide Evening"

                                 else
                                    "Show Evening"
                                )
                            ]
                        ]

                  else
                    text ""
                , ul [ class "pb-10" ]
                    (habits
                        |> List.indexedMap
                            (\i { label, minutesDuration } ->
                                let
                                    isCompleted : Bool
                                    isCompleted =
                                        Set.member ( weekdayLabelFor todaysWeekday, label ) completed
                                in
                                li [ class "text-xl list-disc ml-6" ]
                                    [ if todaysWeekday == visibleWeekday then
                                        UI.button
                                            [ class "py-5 px-3"
                                            , onClick
                                                (State.ToggleHabit
                                                    (weekdayLabelFor todaysWeekday)
                                                    label
                                                )
                                            ]
                                            [ span
                                                [ Utils.class
                                                    [ Always "text-white pt-1 px-2 rounded"
                                                    , If isCompleted "bg-gray-400" "bg-blue-500"
                                                    ]
                                                ]
                                                [ text (String.fromInt minutesDuration ++ " mins") ]
                                            , p
                                                [ Utils.class
                                                    [ Always "inline pl-3"
                                                    , When isCompleted "line-through text-gray-400"
                                                    ]
                                                ]
                                                [ text label ]
                                            ]

                                      else
                                        UI.button
                                            [ class "py-5 px-3 cursor-not-allowed"
                                            , onClick State.DoNothing
                                            ]
                                            [ text label ]
                                    ]
                            )
                    )
                , footer [ class "bg-white text-sm text-center text-gray-500 fixed bottom-0 left-0 w-full py-4" ]
                    [ p [] [ text "This app is brought to you by William Carroll." ]
                    , p [] [ text "Client: Elm; Server: n/a" ]
                    ]
                ]

        ( _, _ ) ->
            p [] [ text "Unable to display habits because we do not know what day of the week it is." ]