"use client"

import type { components } from "@shared/api/__generated__/openapi.types"
import type { JSX } from "react"

import { FunctionComponent } from "react"

import cs from "classnames"

import styles from "./StylePreview.module.scss"

type CaptionStyleConfig = components["schemas"]["CaptionStyleConfig"]

interface IStylePreviewProps {
	config?: CaptionStyleConfig | null
	size?: "small" | "large"
	className?: string
}

const SMALL_SCALE = 0.65

const buildContainerStyles = (
	config: CaptionStyleConfig,
	scale: number,
): React.CSSProperties => {
	const bg = config.background
	return {
		backgroundColor: bg?.bg_color ?? "rgba(0,0,0,0.6)",
		borderRadius: (bg?.bg_border_radius_px ?? 8) * scale,
		padding: (bg?.bg_padding_px ?? 12) * scale,
		...(bg?.bg_blur_px
			? { backdropFilter: `blur(${bg.bg_blur_px * scale}px)` }
			: {}),
		...(bg?.bg_glow_color
			? { boxShadow: `0 0 ${20 * scale}px ${bg.bg_glow_color}` }
			: {}),
	}
}

const buildTextStyles = (
	config: CaptionStyleConfig,
	scale: number,
): React.CSSProperties => {
	const text = config.text
	return {
		fontFamily: text?.font_family ?? "Lobster",
		fontSize: (text?.font_size ?? 40) * scale,
		fontWeight: text?.font_weight ?? 400,
		color: text?.text_color ?? "#FFFFFF",
		textAlign:
			(config.layout?.horizontal_alignment as "left" | "center" | "right") ??
			"center",
		...(text?.text_shadow ? { textShadow: text.text_shadow } : {}),
		...(text?.text_stroke_width
			? {
					WebkitTextStroke: `${(text.text_stroke_width ?? 0) * scale}px ${text.text_stroke_color ?? "#000000"}`,
				}
			: {}),
	}
}

const VERTICAL_MAP: Record<string, string> = {
	top: "flex-start",
	center: "center",
	bottom: "flex-end",
}

const HORIZONTAL_MAP: Record<string, string> = {
	left: "flex-start",
	center: "center",
	right: "flex-end",
}

const buildPositionStyles = (
	config: CaptionStyleConfig,
	scale: number,
): React.CSSProperties => {
	const layout = config.layout
	const vPos = layout?.vertical_position ?? "bottom"
	const hAlign = layout?.horizontal_alignment ?? "center"
	const padding = (layout?.padding_px ?? 20) * scale

	return {
		justifyContent: VERTICAL_MAP[vPos] ?? "flex-end",
		alignItems: HORIZONTAL_MAP[hAlign] ?? "center",
		padding,
	}
}

export const StylePreview: FunctionComponent<IStylePreviewProps> = ({
	config,
	size = "small",
	className,
}): JSX.Element => {
	const safeConfig = config ?? {}
	const highlightColor = safeConfig.text?.highlight_color ?? "#FFFF00"
	const scale = size === "small" ? SMALL_SCALE : 1

	return (
		<div
			className={cs(styles.root, styles[size], className)}
			style={buildPositionStyles(safeConfig, scale)}
			data-testid="StylePreview"
		>
			<div
				style={{
					...buildContainerStyles(safeConfig, scale),
					maxWidth: "100%",
					boxSizing: "border-box",
				}}
			>
				<span
					style={{
						...buildTextStyles(safeConfig, scale),
						wordBreak: "break-word",
					}}
				>
					Пример <span style={{ color: highlightColor }}>субтитров</span>
				</span>
			</div>
		</div>
	)
}
