import {type SharedValue, useDerivedValue} from "react-native-reanimated"

import {useBottomSheetToolboxInternalContext, useKeyboardHeightSharedValue} from "../context"
import {CLOSED_SNAP_POINT} from "../utils"

/**
 * Performs some adjustments to a normalized array of snap-points to account for the keyboard.
 *
 * TODO: right now, we just expand proportionally with the keyboard. However, it would be nice
 * to offer a wider selection strategies such as expanding to largest snap-point etc.
 */
export function useKeyboardAvoidingSnapPoints(
    normalizedSnapPointsSharedValue: SharedValue<number[] | null>
) {
    const keyboardHeightSharedValue = useKeyboardHeightSharedValue()
    const {wrapperHeightSharedValue} = useBottomSheetToolboxInternalContext()

    return useDerivedValue(() => {
        const wrapperHeight = wrapperHeightSharedValue.get()
        const normalizedSnapPoints = normalizedSnapPointsSharedValue.get()

        if (normalizedSnapPoints === null || wrapperHeight === null) return null

        const keyboardAdjustedSnapPoints = normalizedSnapPoints.map((sp) =>
            sp === CLOSED_SNAP_POINT ? sp : sp + keyboardHeightSharedValue.get()
        )

        const wrapperClamped = keyboardAdjustedSnapPoints.map((sp) => Math.min(sp, wrapperHeight))

        return wrapperClamped
    }, [keyboardHeightSharedValue, normalizedSnapPointsSharedValue, wrapperHeightSharedValue])
}