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// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import { Slot } from "@radix-ui/themes";
import { type FC, type ReactNode, use, useCallback } from "react";

import { GridSizeContext } from "./GridSizeContext.ts";
import { RowContext } from "./RowContext.ts";
import { UpdateSelectionContext } from "./UpdateSelectionContext.ts";
import { SelectionContext } from "./SelectionContext.ts";
import { getCellsForRange } from "./helpers.ts";
import type { GridCell, GridSize } from "./types.ts";

function moveCellByKeyboard(
	{ row, column }: GridCell,
	size: GridSize,
	event: KeyboardEvent,
): GridCell {
	const prevColumn = column === 0 ? size.columns - 1 : column - 1;
	const nextColumn = column === size.columns - 1 ? 0 : column + 1;
	const isJumpKeyPressed = event.ctrlKey || event.metaKey;

	switch (event.key) {
		case "Tab":
			return {
				row,
				column: event.shiftKey ? prevColumn : nextColumn,
			};
		case "ArrowLeft":
			return {
				row,
				column: isJumpKeyPressed ? 0 : prevColumn,
			};
		case "ArrowRight":
			return {
				row,
				column: isJumpKeyPressed ? size.columns - 1 : nextColumn,
			};
		case "ArrowDown":
			return {
				row: isJumpKeyPressed ? size.rows - 1 : row === size.rows - 1 ? 0 : row + 1,
				column,
			};
		case "ArrowUp":
			return {
				row: isJumpKeyPressed ? 0 : row === 0 ? size.rows - 1 : row - 1,
				column,
			};
		default:
			return { row, column };
	}
}

export interface CellProps {
	className?: string;

	children: ReactNode;

	asChild?: boolean;

	column: number;
}

export const Cell: FC<CellProps> = ({ asChild, column, ...props }) => {
	const updater = use(UpdateSelectionContext);
	const row = use(RowContext);
	const size = use(GridSizeContext);
	const selection = use(SelectionContext);

	const Component = asChild ? Slot : "div";

	const moveTo = useCallback(
		(row: number, column: number) => {
			updater(() => {
				return {
					cursor: { row, column },
					expandingTo: null,
					committed: [],
				};
			});
		},
		[updater],
	);

	return (
		<Component
			role="gridcell"
			tabIndex={0}
			aria-selected={selection.cells.some(
				(cell) => cell.row === row && cell.column === column,
			)}
			data-selection-start={
				selection.cursor &&
				selection.cursor.row === row &&
				selection.cursor.column === column
					? ""
					: undefined
			}
			data-gridrow={row}
			data-gridcol={column}
			style={{ userSelect: "none" }}
			onClick={(event) => {
				event.preventDefault();

				if (event.shiftKey) {
					updater((prev) => {
						return {
							...prev,
							expandingTo: { row, column },
						};
					});
					return;
				}

				if (event.ctrlKey || event.metaKey) {
					updater((prev) => {
						if (!prev.cursor) {
							return {
								...prev,
								cursor: { row, column },
								expandingTo: null,
							};
						}

						return {
							cursor: { row, column },
							expandingTo: null,
							committed: [
								...prev.committed,
								...getCellsForRange(prev.cursor, prev.expandingTo || prev.cursor),
							],
						};
					});
					return;
				}

				moveTo(row, column);
			}}
			onKeyDown={(event) => {
				switch (event.key) {
					case "Tab":
					case "ArrowDown":
					case "ArrowUp":
					case "ArrowRight":
					case "ArrowLeft": {
						event.preventDefault();

						let next: GridCell;
						if (event.key !== "Tab" && event.shiftKey) {
							next = moveCellByKeyboard(
								selection.expandingTo || { row, column },
								size,
								event.nativeEvent,
							);

							updater((prev) => {
								return {
									...prev,
									expandingTo: next,
								};
							});
						} else {
							next = moveCellByKeyboard(
								selection.cursor || { row, column },
								size,
								event.nativeEvent,
							);

							moveTo(next.row, next.column);
						}

						const nextEl = document.querySelector(
							`[data-gridrow="${next.row}"][data-gridcol="${next.column}"]`,
						);
						if (nextEl instanceof HTMLElement) {
							nextEl.focus();
						}

						return;
					}
				}
			}}
			{...props}
		/>
	);
};