import type { ChartConfig } from '.'
import { isClient } from '@vueuse/core'
import { useId } from 'reka-ui'
import { h, render } from 'vue'

// Simple cache using a Map to store serialized object keys
const cache = new Map<string, string>()

// Convert object to a consistent string key
function serializeKey(key: Record<string, any>): string {
    return JSON.stringify(key, Object.keys(key).sort())
}

interface Constructor<P = any> {
    __isFragment?: never
    __isTeleport?: never
    __isSuspense?: never
    new (...args: any[]): {
        $props: P
    }
}

export function componentToString<P>(config: ChartConfig, component: Constructor<P>, props?: P) {
    if (!isClient) return

    // This function will be called once during mount lifecycle
    const id = useId()

    // https://unovis.dev/docs/auxiliary/Crosshair#component-props
    return (_data: any, x: number | Date) => {
        const data = 'data' in _data ? _data.data : _data
        const serializedKey = `${id}-${serializeKey(data)}`
        const cachedContent = cache.get(serializedKey)
        if (cachedContent) return cachedContent

        const vnode = h<unknown>(component, { ...props, payload: data, config, x })
        const div = document.createElement('div')
        render(vnode, div)
        cache.set(serializedKey, div.innerHTML)
        return div.innerHTML
    }
}