/**
 * ARRAY(337 라 · 설계 1-3) — 「객체 선택:」 → 「배열 유형 입력 [직사각형(R)/원형(PO)] <직사각형>:」(ARRAYTYPE 기억) →
 * 직사각형: 미리보기 4열 × 3행 → 「그립을 선택하여 배열을 편집하거나 [개수(COU)/간격두기(S)/열(COL)/행(R)/종료(X)] <종료>:」 되풀이 ·
 * 원형: 「배열의 중심점 지정:」 → 미리보기 6개 360° → 「… [항목(I)/사이의 각도(A)/채울 각도(F)/항목 회전(ROT)/종료(X)] <종료>:」 되풀이.
 * 종료(X) · 빈 Enter = 만듦 · Esc = 안 만듦 · 처음 간격 = 고른 것 범위 폭 · 높이의 1.5 배.
 */
import type { Point } from '@flatten-js/core';
import { assign, createMachine } from 'xstate';
import { recall, remember } from '../commands/prompt';
import { getPointFromEvent } from '../helpers/get-point-from-event';
import { addEntities, setGhostHelperEntities, setShouldDrawHelpers } from '../state';
import { Tool } from '../tools';
import {
	ARRAY_OPT,
	ARRAY_PROMPT,
	type ArrayValues,
	angleBetween,
	initialSpacing,
	polarCopies,
	rectangularCopies,
} from './array-tool.helpers';
import {
	type DrawEvent,
	END_STATE,
	type NumberInputEvent,
	type PointInputEvent,
	type StateEvent,
	type ToolContext,
} from './tool.types';
import { endState, selectionState, startState } from './transform.helpers';

export enum ArrayState {
	INIT = 'INIT',
	WAITING_FOR_SELECTION = 'WAITING_FOR_SELECTION',
	WAITING_FOR_TYPE = 'WAITING_FOR_TYPE',
	WAITING_FOR_CENTER = 'WAITING_FOR_CENTER',
	EDIT_RECTANGULAR = 'EDIT_RECTANGULAR',
	EDIT_POLAR = 'EDIT_POLAR',
	WAITING_FOR_COLUMNS = 'WAITING_FOR_COLUMNS',
	WAITING_FOR_ROWS = 'WAITING_FOR_ROWS',
	WAITING_FOR_COLUMN_SPACING = 'WAITING_FOR_COLUMN_SPACING',
	WAITING_FOR_ROW_SPACING = 'WAITING_FOR_ROW_SPACING',
	WAITING_FOR_ITEMS = 'WAITING_FOR_ITEMS',
	WAITING_FOR_ANGLE = 'WAITING_FOR_ANGLE',
	WAITING_FOR_FILL = 'WAITING_FOR_FILL',
	WAITING_FOR_ROTATE_ITEMS = 'WAITING_FOR_ROTATE_ITEMS',
}

/** 편집 옵션이 이어 묻는 차례 — 개수 = 열 → 행 · 간격두기 = 열 거리 → 행 거리 · 열 = 수 → 거리 · 행 = 수 → 거리 */
type Flow = 'COUNT' | 'SPACING' | 'COLUMNS' | 'ROWS' | null;

export interface ArrayContext extends ToolContext, ArrayValues {
	flow: Flow;
}

type Ctx = { context: ArrayContext; event: StateEvent };

const S = ArrayState;
const O = ARRAY_OPT;
const esc = { ESC: { target: END_STATE } };
const numberOf = (event: StateEvent) => (event as NumberInputEvent).value;

/** 물음 기본값 = 지금 값(빈 Enter 가 지금 값을 다시 보냄) */
const syncRect = (values: ArrayValues) => {
	remember('ARRAY.COLS', values.columns);
	remember('ARRAY.ROWS', values.rows);
	remember('ARRAY.COLDIST', values.columnSpacing);
	remember('ARRAY.ROWDIST', values.rowSpacing);
};
const syncPolar = (values: ArrayValues) => {
	remember('ARRAY.ITEMS', values.items);
	remember('ARRAY.FILL', values.fill);
	remember('ARRAY.ANGLE', angleBetween(values));
};

const showRect = ({ context }: Ctx) => {
	syncRect(context);
	setGhostHelperEntities(rectangularCopies(context));
};
const showPolar = ({ context }: Ctx) => {
	syncPolar(context);
	setGhostHelperEntities(polarCopies(context));
};
const create = (copies: (values: ArrayValues) => unknown[]) => ({
	actions: ({ context }: Ctx) => {
		const made = copies(context) as Parameters<typeof addEntities>[0];
		if (made.length) addEntities(made, true);
	},
	target: END_STATE,
});

/** 숫자 물음 — 받아서 assign · 흐름 따라 다음 */
const numberStep = (
	prompt: unknown,
	take: (value: number, context: ArrayContext) => Partial<ArrayContext> | null,
	next: { flow?: Flow; target: string }[]
) => ({
	meta: { kind: 'number', prompt },
	on: {
		NUMBER_INPUT: [
			...next.map(({ flow, target }) => ({
				guard: ({ context, event }: Ctx) =>
					!!take(numberOf(event), context) && (flow === undefined || context.flow === flow),
				actions: assign(({ context, event }: Ctx) => take(numberOf(event), context) ?? {}),
				target,
			})),
			{ actions: () => noticeLater('값이 범위를 벗어남.') },
		],
		...esc,
	},
});

const noticeLater = (text: string) => {
	void import('../inputController/prompt-input').then(({ notice }) => notice(text));
};

const fillOk = (fill: number) => fill !== 0 && Math.abs(fill) <= 360;

// biome-ignore lint/suspicious/noExplicitAny: 공용 상태 조각(여러 도구 공통)을 섞어 만든다
const states: Record<string, any> = {
	[S.INIT]: startState(S.WAITING_FOR_TYPE),
	[S.WAITING_FOR_SELECTION]: selectionState(S.WAITING_FOR_TYPE),
	[S.WAITING_FOR_TYPE]: {
		meta: {
			kind: 'keyword',
			prompt: () => ARRAY_PROMPT.type(recall<string>('ARRAYTYPE') ?? O.RECTANGULAR.key),
		},
		on: {
			'OPTION.RECTANGULAR': {
				actions: [
					() => remember('ARRAYTYPE', O.RECTANGULAR.key),
					assign(({ context }: Ctx) => {
						const spacing = initialSpacing(context.originals);
						return {
							columns: recall<number>('ARRAY.COLS') ?? 4,
							rows: recall<number>('ARRAY.ROWS') ?? 3,
							columnSpacing: spacing.column,
							rowSpacing: spacing.row,
						};
					}),
				],
				target: S.EDIT_RECTANGULAR,
			},
			'OPTION.POLAR': {
				actions: [
					() => remember('ARRAYTYPE', O.POLAR.key),
					assign(() => ({
						items: recall<number>('ARRAY.ITEMS') ?? 6,
						fill: recall<number>('ARRAY.FILL') ?? 360,
						rotateItems: true,
					})),
				],
				target: S.WAITING_FOR_CENTER,
			},
			...esc,
		},
	},
	[S.WAITING_FOR_CENTER]: {
		meta: { kind: 'point', prompt: ARRAY_PROMPT.center },
		entry: () => setShouldDrawHelpers(true),
		on: {
			DRAW: {
				actions: ({ context, event }: Ctx) =>
					setGhostHelperEntities(polarCopies(context, getPointFromEvent(null, event as DrawEvent))),
			},
			...Object.fromEntries(
				['MOUSE_CLICK', 'ABSOLUTE_POINT_INPUT'].map((type) => [
					type,
					{
						actions: assign(({ event }: Ctx) => ({
							center: getPointFromEvent(null, event as PointInputEvent) as Point,
						})),
						target: S.EDIT_POLAR,
					},
				])
			),
			...esc,
		},
	},
	[S.EDIT_RECTANGULAR]: {
		meta: { kind: 'keyword', prompt: ARRAY_PROMPT.editRect },
		entry: [() => setShouldDrawHelpers(false), assign({ flow: null }), showRect],
		on: {
			'OPTION.COUNT': {
				actions: assign({ flow: 'COUNT' as Flow }),
				target: S.WAITING_FOR_COLUMNS,
			},
			'OPTION.SPACING': {
				actions: assign({ flow: 'SPACING' as Flow }),
				target: S.WAITING_FOR_COLUMN_SPACING,
			},
			'OPTION.COLUMNS': {
				actions: assign({ flow: 'COLUMNS' as Flow }),
				target: S.WAITING_FOR_COLUMNS,
			},
			'OPTION.ROWS': { actions: assign({ flow: 'ROWS' as Flow }), target: S.WAITING_FOR_ROWS },
			'OPTION.EXIT': create(rectangularCopies),
			...esc,
		},
	},
	[S.WAITING_FOR_COLUMNS]: numberStep(
		ARRAY_PROMPT.columns,
		(columns) => {
			remember('ARRAY.COLS', columns);
			return { columns };
		},
		[{ flow: 'COUNT', target: S.WAITING_FOR_ROWS }, { target: S.WAITING_FOR_COLUMN_SPACING }]
	),
	[S.WAITING_FOR_ROWS]: numberStep(
		ARRAY_PROMPT.rows,
		(rows) => {
			remember('ARRAY.ROWS', rows);
			return { rows };
		},
		[{ flow: 'ROWS', target: S.WAITING_FOR_ROW_SPACING }, { target: S.EDIT_RECTANGULAR }]
	),
	[S.WAITING_FOR_COLUMN_SPACING]: numberStep(
		ARRAY_PROMPT.columnSpacing,
		(columnSpacing) => ({ columnSpacing }),
		[{ flow: 'SPACING', target: S.WAITING_FOR_ROW_SPACING }, { target: S.EDIT_RECTANGULAR }]
	),
	[S.WAITING_FOR_ROW_SPACING]: numberStep(
		ARRAY_PROMPT.rowSpacing,
		(rowSpacing) => ({ rowSpacing }),
		[{ target: S.EDIT_RECTANGULAR }]
	),
	[S.EDIT_POLAR]: {
		meta: { kind: 'keyword', prompt: ARRAY_PROMPT.editPolar },
		entry: [() => setShouldDrawHelpers(false), showPolar],
		on: {
			'OPTION.ITEMS': { target: S.WAITING_FOR_ITEMS },
			'OPTION.ANGLE': { target: S.WAITING_FOR_ANGLE },
			'OPTION.FILL': { target: S.WAITING_FOR_FILL },
			'OPTION.ROTATE': { target: S.WAITING_FOR_ROTATE_ITEMS },
			'OPTION.EXIT': create(polarCopies),
			...esc,
		},
	},
	[S.WAITING_FOR_ITEMS]: numberStep(
		ARRAY_PROMPT.items,
		(items) => {
			remember('ARRAY.ITEMS', items);
			return { items };
		},
		[{ target: S.EDIT_POLAR }]
	),
	// 사이 각 → 채울 각 = 사이 각 × (항목 − 1)(같은 자리)
	[S.WAITING_FOR_ANGLE]: numberStep(
		ARRAY_PROMPT.angle,
		(angle, context) => {
			const fill = angle * Math.max(context.items - 1, 1);
			return fillOk(fill) ? { fill } : null;
		},
		[{ target: S.EDIT_POLAR }]
	),
	[S.WAITING_FOR_FILL]: numberStep(
		ARRAY_PROMPT.fill,
		(fill) => {
			if (!fillOk(fill)) return null;
			remember('ARRAY.FILL', fill);
			return { fill };
		},
		[{ target: S.EDIT_POLAR }]
	),
	[S.WAITING_FOR_ROTATE_ITEMS]: {
		meta: { kind: 'keyword', prompt: ARRAY_PROMPT.rotateItems },
		on: {
			'OPTION.YES': { actions: assign({ rotateItems: true }), target: S.EDIT_POLAR },
			'OPTION.NO': { actions: assign({ rotateItems: false }), target: S.EDIT_POLAR },
			...esc,
		},
	},
	[END_STATE]: endState,
};

export const arrayToolStateMachine = createMachine({
	types: {} as { context: ArrayContext; events: StateEvent },
	context: {
		originals: [],
		columns: 4,
		rows: 3,
		columnSpacing: 1,
		rowSpacing: 1,
		center: null,
		items: 6,
		fill: 360,
		rotateItems: true,
		flow: null,
		type: Tool.ARRAY,
	},
	initial: S.INIT,
	states,
});