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,
): { kind: ActionKind; nextState: BallState } {
    switch (ballState) {
        case BallState.HOLDS_ORIGIN:
            return target
                ? { kind: ActionKind.SHOOT, nextState: BallState.PASSED_ORIGIN }
                : { kind: ActionKind.DRIBBLE, nextState: ballState }
        case BallState.HOLDS_BY_PASS:
            return target
                ? { kind: ActionKind.SHOOT, nextState: BallState.PASSED }
                : { kind: ActionKind.DRIBBLE, nextState: ballState }
        case BallState.PASSED_ORIGIN:
        case BallState.PASSED:
        case BallState.NONE:
            return {
                kind:
                    target && target.type != BALL_TYPE
                        ? ActionKind.SCREEN
                        : ActionKind.MOVE,
                nextState: ballState,
            }
    }
}

export function getActionKindBetween(
    origin: Player | PlayerPhantom,
    target: TacticComponent | null,
    state: BallState,
): { kind: ActionKind; nextState: BallState } {
    //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.ballState != BallState.HOLDS_BY_PASS &&
        origin.ballState != BallState.HOLDS_ORIGIN &&
        origin.actions.find((a) => moves(a.type))
    ) {
        console.log("a")
        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))
    ) {
        console.log("b")
        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)
    ) {
        console.log("c")
        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)) {
            console.log("e")
            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" &&
                    moves(a.type) &&
                    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" &&
                    moves(a.type) &&
                    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(forceHasBall: boolean): 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
        if (forceHasBall) phantomState = BallState.HOLDS_ORIGIN
        else
            switch (origin.ballState) {
                case BallState.HOLDS_ORIGIN:
                    phantomState = BallState.HOLDS_BY_PASS
                    break
                case BallState.PASSED:
                case BallState.PASSED_ORIGIN:
                    phantomState = BallState.NONE
                    break
                default:
                    phantomState = origin.ballState
            }

        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).kind,
                segments: [{ next: toId }],
            }

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

    const phantomId = createPhantom(false)

    const action: Action = {
        target: phantomId,
        type: getActionKind(null, origin.ballState).kind,
        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 (target.type === "player" || target.type === "phantom")
            content = changePlayerBallState(target, BallState.NONE, content)

        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 === "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)) {
            switch (newState) {
                case BallState.PASSED:
                case BallState.PASSED_ORIGIN:
                    targetState = BallState.NONE
                    break
                case BallState.HOLDS_ORIGIN:
                    targetState = BallState.HOLDS_BY_PASS
                    break
                default:
                    targetState = 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 { kind, nextState } = getActionKindBetween(
                origin,
                actionTarget,
                newState,
            )

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

        content = spreadNewStateFromOriginStateChange(
            actionTarget,
            targetState,
            content,
        )
    }

    return content
}