import React, { CSSProperties, useEffect, useRef, useState } from "react"
import "../style/editor.css"
import TitleInput from "../components/TitleInput"
import { BasketCourt } from "../components/editor/BasketCourt"

import { Rack } from "../components/Rack"
import { PlayerPiece } from "../components/editor/PlayerPiece"

import { Player } from "../tactic/Player"
import { Tactic, TacticContent } from "../tactic/Tactic"
import { fetchAPI } from "../Fetcher"
import { Team } from "../tactic/Team"
import { calculateRatio } from "../Utils"
import SavingState, { SaveStates } from "../components/editor/SavingState"

const ERROR_STYLE: CSSProperties = {
    borderColor: "red",
}

export interface EditorViewProps {
    tactic: Tactic
    onContentChange: (tactic: TacticContent) => Promise<boolean>
    onNameChange: (name: string) => Promise<boolean>
}

/**
 * information about a player that is into a rack
 */
interface RackedPlayer {
    team: Team
    key: string
}

export default function Editor({
    id,
    name,
    content,
}: {
    id: number
    name: string
    content: string
}) {
    return (
        <EditorView
            tactic={{ name, id, content: JSON.parse(content) }}
            onContentChange={(content: TacticContent) =>
                fetchAPI(`tactic/${id}/save`, { content }).then((r) => r.ok)
            }
            onNameChange={(name: string) =>
                fetchAPI(`tactic/${id}/edit/name`, { name }).then((r) => r.ok)
            }
        />
    )
}

function EditorView({
    tactic: { name, content },
    onContentChange,
    onNameChange,
}: EditorViewProps) {
    const [style, setStyle] = useState<CSSProperties>({})
    const [saveState, setSaveState] = useState(SaveStates.Ok)

    const positions = ["1", "2", "3", "4", "5"]
    const [allies, setAllies] = useState(
        positions
            .filter(
                (role) =>
                    content.players.findIndex(
                        (p) => p.team == Team.Allies && p.role == role,
                    ) == -1,
            )
            .map((key) => ({ team: Team.Allies, key })),
    )
    const [opponents, setOpponents] = useState(
        positions
            .filter(
                (role) =>
                    content.players.findIndex(
                        (p) => p.team == Team.Opponents && p.role == role,
                    ) == -1,
            )
            .map((key) => ({ team: Team.Opponents, key })),
    )

    const [players, setPlayers] = useState<Player[]>(content.players)
    const courtDivContentRef = useRef<HTMLDivElement>(null)

    // The didMount ref is used to store a boolean flag in order to avoid calling 'onChange' when the editor is first rendered.
    const didMount = useRef(false)
    useEffect(() => {
        if (!didMount.current) {
            didMount.current = true
            return
        }
        setSaveState(SaveStates.Saving)
        onContentChange({ players })
            .then((success) => {
                if (success) {
                    setSaveState(SaveStates.Ok)
                } else {
                    setSaveState(SaveStates.Err)
                }
            })
            .catch(() => setSaveState(SaveStates.Err))
    }, [players])

    const canDetach = (ref: HTMLDivElement) => {
        const refBounds = ref.getBoundingClientRect()
        const courtBounds = courtDivContentRef.current!.getBoundingClientRect()

        // check if refBounds overlaps courtBounds
        return !(
            refBounds.top > courtBounds.bottom ||
            refBounds.right < courtBounds.left ||
            refBounds.bottom < courtBounds.top ||
            refBounds.left > courtBounds.right
        )
    }

    const onPieceDetach = (ref: HTMLDivElement, element: RackedPlayer) => {
        const refBounds = ref.getBoundingClientRect()
        const courtBounds = courtDivContentRef.current!.getBoundingClientRect()

        const { x, y } = calculateRatio(refBounds, courtBounds)

        setPlayers((players) => {
            return [
                ...players,
                {
                    id: players.length,
                    team: element.team,
                    role: element.key,
                    rightRatio: x,
                    bottomRatio: y,
                },
            ]
        })
    }

    return (
        <div id="main-div">
            <div id="topbar-div">
                <div id="topbar-left">
                    LEFT
                    <SavingState state={saveState} />
                </div>
                <div id="title-input-div">
                    <TitleInput
                        style={style}
                        default_value={name}
                        on_validated={(new_name) => {
                            onNameChange(new_name).then((success) => {
                                if (success) {
                                    setStyle({})
                                } else {
                                    setStyle(ERROR_STYLE)
                                }
                            })
                        }}
                    />
                </div>
                <div id="topbar-right">RIGHT</div>
            </div>
            <div id="edit-div">
                <div id="racks">
                    <Rack
                        id="allies-rack"
                        objects={allies}
                        onChange={setAllies}
                        canDetach={canDetach}
                        onElementDetached={onPieceDetach}
                        render={({ team, key }) => (
                            <PlayerPiece team={team} text={key} key={key} />
                        )}
                    />
                    <Rack
                        id="opponent-rack"
                        objects={opponents}
                        onChange={setOpponents}
                        canDetach={canDetach}
                        onElementDetached={onPieceDetach}
                        render={({ team, key }) => (
                            <PlayerPiece team={team} text={key} key={key} />
                        )}
                    />
                </div>
                <div id="court-div">
                    <div id="court-div-bounds" ref={courtDivContentRef}>
                        <BasketCourt
                            players={players}
                            onPlayerChange={(player) => {
                                setPlayers((players) => {
                                    const idx = players.findIndex(
                                        (p) => p.id === player.id,
                                    )
                                    return players.toSpliced(idx, 1, player)
                                })
                            }}
                            onPlayerRemove={(player) => {
                                setPlayers((players) => {
                                    const idx = players.findIndex(
                                        (p) => p.id === player.id,
                                    )
                                    return players.toSpliced(idx, 1)
                                })
                                switch (player.team) {
                                    case Team.Opponents:
                                        setOpponents((opponents) => [
                                            ...opponents,
                                            {
                                                team: player.team,
                                                pos: player.role,
                                                key: player.role,
                                            },
                                        ])
                                        break
                                    case Team.Allies:
                                        setAllies((allies) => [
                                            ...allies,
                                            {
                                                team: player.team,
                                                pos: player.role,
                                                key: player.role,
                                            },
                                        ])
                                }
                            }}
                        />
                    </div>
                </div>
            </div>
        </div>
    )
}