import {BallState, Player, PlayerPhantom} from "../model/tactic/Player"
import {ratioWithinBase} from "../geo/Pos"
import {ComponentId, TacticComponent, TacticContent,} from "../model/tactic/Tactic"
import {overlaps} from "../geo/Box"
import {Action, ActionKind, moves} from "../model/tactic/Action"
import {removeBall, updateComponent} from "./TacticContentDomains"
import {areInSamePath, changePlayerBallState, getOrigin, isNextInPath, removePlayer} from "./PlayerDomains"
import {BALL_TYPE} from "../model/tactic/CourtObjects";

export function getActionKind(
    target: TacticComponent | null,
    ballState: BallState,
): ActionKind {
    switch (ballState) {
        case BallState.HOLDS_ORIGIN:
        case BallState.HOLDS_BY_PASS:
            return target
                ? ActionKind.SHOOT
                : ActionKind.DRIBBLE
        case BallState.PASSED_ORIGIN:
        case BallState.PASSED:
        case BallState.NONE:
            return target && target.type != BALL_TYPE
                ? ActionKind.SCREEN
                : ActionKind.MOVE
    }
}

export function getActionKindBetween(origin: Player | PlayerPhantom, target: TacticComponent | null, state: BallState): ActionKind {
    //remove the target if the target is a phantom that is within the origin's path
    if (target != null && target.type == 'phantom' && areInSamePath(origin, target)) {
        target = null;
    }

    return getActionKind(target, state)
}

export function isActionValid(origin: TacticComponent, target: TacticComponent | null, components: TacticComponent[]): boolean {
    /// action is valid if the origin is neither a phantom nor a player
    if (origin.type != "phantom" && origin.type != "player") {
        return true
    }

    // action is invalid if the origin already moves (unless the origin holds a ball which will lead to a ball pass)
    if (origin.actions.find(a => moves(a.type)) && origin.ballState != BallState.HOLDS_BY_PASS) {
        return false
    }
    //Action is valid if the target is null
    if (target == null) {
        return true
    }

    // action is invalid if it targets its own origin
    if (origin.id === target.id) {
        return false
    }

    // action is invalid if the target already moves and is not indirectly bound with origin
    if (target.actions.find(a => moves(a.type)) && (hasBoundWith(target, origin, components) || hasBoundWith(origin, target, components))) {
        return false
    }

    // Action is invalid if there is already an action between origin and target.
    if (origin.actions.find(a => a.target === target?.id) || target?.actions.find(a => a.target === origin.id)) {
        return false
    }


    // Action is invalid if there is already an anterior action within the target's path
    if (target.type == "phantom" || target.type == "player") {

        // cant have an action with current path
        if (areInSamePath(origin, target))
            return false;


        if (alreadyHasAnAnteriorActionWith(origin, target, components)) {
            return false
        }
    }

    return true
}

function hasBoundWith(origin: TacticComponent, target: TacticComponent, components: TacticComponent[]): boolean {
    const toVisit = [origin.id]
    const visited: string[] = []

    let itemId: string | undefined
    while ((itemId = toVisit.pop())) {

        if (visited.indexOf(itemId) !== -1)
            continue

        visited.push(itemId)

        const item = components.find(c => c.id === itemId)!

        const itemBounds = item.actions.flatMap(a => typeof a.target == "string" ? [a.target] : [])
        if (itemBounds.indexOf(target.id) !== -1) {
            return true
        }

        toVisit.push(...itemBounds)
    }

    return false
}

function alreadyHasAnAnteriorActionWith(origin: Player | PlayerPhantom, target: Player | PlayerPhantom, components: TacticComponent[]): boolean {
    const targetOrigin = target.type === "phantom" ? getOrigin(target, components) : target
    const targetOriginPath = [targetOrigin.id, ...(targetOrigin.path?.items ?? [])]

    const originOrigin = origin.type === "phantom" ? getOrigin(origin, components) : origin
    const originOriginPath = [originOrigin.id, ...(originOrigin.path?.items ?? [])]

    const targetIdx = targetOriginPath.indexOf(target.id)
    for (let i = targetIdx; i < targetOriginPath.length; i++) {
        const phantom = components.find(c => c.id === targetOriginPath[i])! as (Player | PlayerPhantom)
        if (phantom.actions.find(a => typeof a.target === "string" && (originOriginPath.indexOf(a.target) !== -1))) {
            return true;
        }
    }

    const originIdx = originOriginPath.indexOf(origin.id)
    for (let i = 0; i <= originIdx; i++) {
        const phantom = components.find(c => c.id === originOriginPath[i])! as (Player | PlayerPhantom)
        if (phantom.actions.find(a => typeof a.target === "string" && targetOriginPath.indexOf(a.target) > targetIdx)) {
            return true;
        }
    }

    return false;
}

export function createAction(
    origin: Player | PlayerPhantom,
    courtBounds: DOMRect,
    arrowHead: DOMRect,
    content: TacticContent,
): { createdAction: Action; newContent: TacticContent } {
    /**
     * Creates a new phantom component.
     * Be aware that this function will reassign the `content` parameter.
     */
    function createPhantom(originState: BallState): ComponentId {
        const {x, y} = ratioWithinBase(arrowHead, courtBounds)

        let itemIndex: number
        let originPlayer: Player

        if (origin.type == "phantom") {
            // if we create a phantom from another phantom,
            // simply add it to the phantom's path
            const originPlr = getOrigin(origin, content.components)!
            itemIndex = originPlr.path!.items.length
            originPlayer = originPlr
        } else {
            // if we create a phantom directly from a player
            // create a new path and add it into
            itemIndex = 0
            originPlayer = origin
        }

        const path = originPlayer.path

        const phantomId = "phantom-" + itemIndex + "-" + originPlayer.id

        content = updateComponent(
            {
                ...originPlayer,
                path: {
                    items: path ? [...path.items, phantomId] : [phantomId],
                },
            },
            content,
        )

        let phantomState: BallState
        switch (originState) {
            case BallState.HOLDS_ORIGIN:
                phantomState = BallState.HOLDS_BY_PASS
                break
            case BallState.PASSED:
            case BallState.PASSED_ORIGIN:
                phantomState = BallState.NONE
                break
            default:
                phantomState = originState
        }

        const phantom: PlayerPhantom = {
            type: "phantom",
            id: phantomId,
            rightRatio: x,
            bottomRatio: y,
            originPlayerId: originPlayer.id,
            ballState: phantomState,
            actions: [],
        }
        content = {
            ...content,
            components: [...content.components, phantom],
        }
        return phantom.id
    }

    for (const component of content.components) {
        if (component.id == origin.id) {
            continue
        }

        const componentBounds = document
            .getElementById(component.id)!
            .getBoundingClientRect()

        if (overlaps(componentBounds, arrowHead)) {
            let toId = component.id

            if (component.type == "ball") {
                toId = createPhantom(true)
                content = removeBall(content)
            }

            const action: Action = {
                target: toId,
                type: getActionKind(component, origin.ballState),
                segments: [{next: toId}],
            }

            return {
                newContent: updateComponent(
                    {
                        ...content.components.find((c) => c.id == origin.id)!,
                        actions: [...origin.actions, action],
                    },
                    content,
                ),
                createdAction: action,
            }
        }
    }

    const phantomId = createPhantom(origin.ballState)

    const action: Action = {
        target: phantomId,
        type: getActionKind(null, origin.ballState),
        segments: [{next: phantomId}],
    }
    return {
        newContent: updateComponent(
            {
                ...content.components.find((c) => c.id == origin.id)!,
                actions: [...origin.actions, action],
            },
            content,
        ),
        createdAction: action,
    }
}

export function removeAllActionsTargeting(
    componentId: ComponentId,
    content: TacticContent,
): TacticContent {
    const components = []
    for (let i = 0; i < content.components.length; i++) {
        const component = content.components[i]
        components.push({
            ...component,
            actions: component.actions.filter((a) => a.target != componentId),
        })
    }

    return {
        ...content,
        components,
    }
}


export function removeAction(origin: TacticComponent, action: Action, actionIdx: number, content: TacticContent): TacticContent {
    origin = {
        ...origin,
        actions: origin.actions.toSpliced(actionIdx, 1),
    }
    content = updateComponent(
        origin,
        content,
    )

    if (action.target == null) return content

    const target = content.components.find(
        (c) => action.target == c.id,
    )!

    // if the removed action is a shoot, set the origin as holding the ball
    if (action.type == ActionKind.SHOOT && (origin.type === "player" || origin.type === "phantom")) {
        if (origin.ballState === BallState.PASSED)
            content = changePlayerBallState(origin, BallState.HOLDS_BY_PASS, content)
        else if (origin.ballState === BallState.PASSED_ORIGIN)
            content = changePlayerBallState(origin, BallState.HOLDS_ORIGIN, content)

        if (target.type === "player" || target.type === "phantom")
            content = changePlayerBallState(target, BallState.NONE, content)
    }

    if (target.type === "phantom") {
        let path = null
        if (origin.type === "player") {
            path = origin.path
        } else if (origin.type === "phantom") {
            path = getOrigin(origin, content.components).path
        }

        if (
            path != null &&
            path.items.find((c) => c == target.id)
        ) {
            content = removePlayer(target, content)
        }
    }



    return content
}

/**
 * Spreads the changes to others actions and components, directly or indirectly bound to the origin, implied by the change of the origin's actual state with
 * the given newState.
 * @param origin
 * @param newState
 * @param content
 */
export function spreadNewStateFromOriginStateChange(origin: Player | PlayerPhantom, newState: BallState, content: TacticContent): TacticContent {
    if (origin.ballState === newState) {
        return content
    }

    origin = {
        ...origin,
        ballState: newState
    }

    content = updateComponent(origin, content)

    for (let i = 0; i < origin.actions.length; i++) {
        const action = origin.actions[i]
        if (typeof action.target !== "string") {
            continue;
        }

        const actionTarget = content.components.find(c => action.target === c.id)! as Player | PlayerPhantom;

        let targetState: BallState = actionTarget.ballState
        let deleteAction = false

        if (isNextInPath(origin, actionTarget, content.components)) {
            /// If the target is the next phantom from the origin, its state is propagated.
            targetState = (newState === BallState.PASSED || newState === BallState.PASSED_ORIGIN) ? BallState.NONE : newState
        } else if (newState === BallState.NONE && action.type === ActionKind.SHOOT) {
            /// if the new state removes the ball from the player, remove all actions that were meant to shoot the ball
            deleteAction = true
            targetState = BallState.NONE // then remove the ball for the target as well
        } else if ((newState === BallState.HOLDS_BY_PASS || newState === BallState.HOLDS_ORIGIN) && action.type === ActionKind.SCREEN) {
            targetState = BallState.HOLDS_BY_PASS
        }

        if (deleteAction) {
            content = removeAction(origin, action, i, content)
            origin = content.components.find(c => c.id === origin.id)! as Player | PlayerPhantom
            i--; // step back
        } else {
            // do not change the action type if it is a shoot action
            const type = action.type == ActionKind.SHOOT
                ? ActionKind.SHOOT
                : getActionKindBetween(origin, actionTarget, newState)

            origin = {
                ...origin,
                actions: origin.actions.toSpliced(i, 1, {
                    ...action,
                    type
                })
            }
            content = updateComponent(origin, content)
        }

        content = spreadNewStateFromOriginStateChange(actionTarget, targetState, content)
    }

    return content
}