"use client"

import { cn } from "@/utils/utils"
import * as React from "react"
import { useInView } from "react-intersection-observer"
import * as RechartsPrimitive from "recharts"

const THEMES = { light: "", dark: ".dark" } as const

export type ChartConfig = {
    [k in string]: {
        label?: React.ReactNode
        icon?: React.ComponentType
    } & (
        | { color?: string; theme?: never }
        | { color?: never; theme: Record<keyof typeof THEMES, string> }
    )
}

type ChartContextProps = {
    config: ChartConfig
}

const ChartContext = React.createContext<ChartContextProps | null>(null)

function useChart() {
    const context = React.useContext(ChartContext)

    if (!context) {
        throw new Error("useChart must be used within a <ChartContainer />")
    }

    return context
}

const ChartContainer = React.forwardRef<
    HTMLDivElement,
    React.ComponentProps<"div"> & {
        config: ChartConfig
        children: React.ComponentProps<
            typeof RechartsPrimitive.ResponsiveContainer
        >["children"]
    }
>(({ id, className, children, config, ...props }, ref) => {
    const uniqueId = React.useId()
    const chartId = `chart-${id || uniqueId.replace(/:/g, "")}`
    const { ref: viewRef, inView } = useInView({ triggerOnce: true, threshold: 1, })

    return (
        <ChartContext.Provider value={{ config }}>
            <div
                data-chart={chartId}
                ref={(node) => {
                    if (node) {
                        viewRef(node)
                        if (typeof ref === "function") ref(node)
                        else if (ref) ref.current = node
                    }
                }}
                className={cn(
                    "flex aspect-video justify-center text-xs [&_.recharts-cartesian-axis-tick_text]:fill-muted-foreground [&_.recharts-cartesian-grid_line[stroke='#ccc']]:stroke-border/50 [&_.recharts-curve.recharts-tooltip-cursor]:stroke-border [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-none [&_.recharts-polar-grid_[stroke='#ccc']]:stroke-border [&_.recharts-radial-bar-background-sector]:fill-muted [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-muted [&_.recharts-reference-line_[stroke='#ccc']]:stroke-border [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-sector]:outline-none [&_.recharts-surface]:outline-none",
                    className
                )}
                {...props}
            >
                {inView && (
                    <>
                        <ChartStyle id={chartId} config={config} />
                        <RechartsPrimitive.ResponsiveContainer>
                            {children}
                        </RechartsPrimitive.ResponsiveContainer>
                    </>
                )}
            </div>
        </ChartContext.Provider>
    )
})
ChartContainer.displayName = "Chart"

const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
    const colorConfig = Object.entries(config).filter(
        ([/* unused */, config]) => config.theme || config.color
    )

    if (!colorConfig.length) {
        return null
    }

    return (
        <style
            dangerouslySetInnerHTML={{
                __html: Object.entries(THEMES)
                    .map(
                        ([theme, prefix]) => `
${prefix} [data-chart=${id}] {
${colorConfig
                                .map(([key, itemConfig]) => {
                                    const color =
                                        itemConfig.theme?.[theme as keyof typeof itemConfig.theme] ||
                                        itemConfig.color
                                    return color ? `  --color-${key}: ${color};` : null
                                })
                                .join("\n")}
}
`
                    )
                    .join("\n"),
            }}
        />
    )
}

const ChartTooltip = RechartsPrimitive.Tooltip

const ChartTooltipContent = React.forwardRef<
    HTMLDivElement,
    React.ComponentProps<typeof RechartsPrimitive.Tooltip> &
    React.ComponentProps<"div"> & {
        hideLabel?: boolean
        hideIndicator?: boolean
        indicator?: "line" | "dot" | "dashed"
        nameKey?: string
        labelKey?: string
    }
>(
    (
        {
            active,
            payload,
            className,
            indicator = "dot",
            hideLabel = false,
            hideIndicator = false,
            label,
            labelFormatter,
            labelClassName,
            formatter,
            color,
            nameKey,
            labelKey,
        },
        ref
    ) => {
        const { config } = useChart()

        const tooltipLabel = React.useMemo(() => {
            if (hideLabel || !payload?.length) {
                return null
            }

            const [item] = payload
            const key = `${labelKey || item.dataKey || item.name || "value"}`
            const itemConfig = getPayloadConfigFromPayload(config, item, key)
            const value =
                !labelKey && typeof label === "string"
                    ? config[label as keyof typeof config]?.label || label
                    : itemConfig?.label

            if (labelFormatter) {
                return (
                    <div className={cn("font-medium", labelClassName)}>
                        {labelFormatter(value, payload)}
                    </div>
                )
            }

            if (!value) {
                return null
            }

            return <div className={cn("font-medium", labelClassName)}>{value}</div>
        }, [
            label,
            labelFormatter,
            payload,
            hideLabel,
            labelClassName,
            config,
            labelKey,
        ])

        if (!active || !payload?.length) {
            return null
        }

        const nestLabel = payload.length === 1 && indicator !== "dot"

        return (
            <div
                ref={ref}
                className={cn(
                    "grid min-w-[8rem] items-start gap-1.5 rounded-lg border border-border/50 bg-background px-2.5 py-1.5 text-xs shadow-xl",
                    className
                )}
            >
                {!nestLabel ? tooltipLabel : null}
                <div className="grid gap-1.5">
                    {payload.map((item, index) => {
                        const key = `${nameKey || item.name || item.dataKey || "value"}`
                        const itemConfig = getPayloadConfigFromPayload(config, item, key)
                        const indicatorColor = color || item.payload.fill || item.color

                        return (
                            <div
                                key={item.dataKey}
                                className={cn(
                                    "flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5 [&>svg]:text-muted-foreground",
                                    indicator === "dot" && "items-center"
                                )}
                            >
                                {formatter && item?.value !== undefined && item.name ? (
                                    formatter(item.value, item.name, item, index, item.payload)
                                ) : (
                                    <>
                                        {itemConfig?.icon ? (
                                            <itemConfig.icon />
                                        ) : (
                                            !hideIndicator && (
                                                <div
                                                    className={cn(
                                                        "shrink-0 rounded-[2px] border-[--color-border] bg-[--color-bg]",
                                                        {
                                                            "h-2.5 w-2.5": indicator === "dot",
                                                            "w-1": indicator === "line",
                                                            "w-0 border-[1.5px] border-dashed bg-transparent":
                                                                indicator === "dashed",
                                                            "my-0.5": nestLabel && indicator === "dashed",
                                                        }
                                                    )}
                                                    style={
                                                        {
                                                            "--color-bg": indicatorColor,
                                                            "--color-border": indicatorColor,
                                                        } as React.CSSProperties
                                                    }
                                                />
                                            )
                                        )}
                                        <div
                                            className={cn(
                                                "flex flex-1 justify-between leading-none",
                                                nestLabel ? "items-end" : "items-center"
                                            )}
                                        >
                                            <div className="grid gap-1.5">
                                                {nestLabel ? tooltipLabel : null}
                                                <span className="text-muted-foreground">
                                                    {itemConfig?.label || item.name}
                                                </span>
                                            </div>
                                            {item.value && (
                                                <span className="font-mono font-medium tabular-nums text-foreground">
                                                    {item.value.toLocaleString()}
                                                </span>
                                            )}
                                        </div>
                                    </>
                                )}
                            </div>
                        )
                    })}
                </div>
            </div>
        )
    }
)
ChartTooltipContent.displayName = "ChartTooltip"

const ChartLegend = RechartsPrimitive.Legend

const ChartLegendContent = React.forwardRef<
    HTMLDivElement,
    React.ComponentProps<"div"> &
    Pick<RechartsPrimitive.LegendProps, "payload" | "verticalAlign"> & {
        hideIcon?: boolean
        nameKey?: string
    }
>(
    (
        { className, hideIcon = false, payload, verticalAlign = "bottom", nameKey },
        ref
    ) => {
        const { config } = useChart()

        if (!payload?.length) {
            return null
        }

        return (
            <div
                ref={ref}
                className={cn(
                    "flex items-center justify-center gap-4",
                    verticalAlign === "top" ? "pb-3" : "pt-3",
                    className
                )}
            >
                {payload.map((item) => {
                    const key = `${nameKey || item.dataKey || "value"}`
                    const itemConfig = getPayloadConfigFromPayload(config, item, key)

                    return (
                        <div
                            key={item.value}
                            className={cn(
                                "flex items-center gap-1.5 [&>svg]:h-3 [&>svg]:w-3 [&>svg]:text-muted-foreground"
                            )}
                        >
                            {itemConfig?.icon && !hideIcon ? (
                                <itemConfig.icon />
                            ) : (
                                <div
                                    className="h-2 w-2 shrink-0 rounded-[2px]"
                                    style={{
                                        backgroundColor: item.color,
                                    }}
                                />
                            )}
                            {itemConfig?.label}
                        </div>
                    )
                })}
            </div>
        )
    }
)
ChartLegendContent.displayName = "ChartLegend"

// Helper to extract item config from a payload.
function getPayloadConfigFromPayload(
    config: ChartConfig,
    payload: unknown,
    key: string
) {
    if (typeof payload !== "object" || payload === null) {
        return undefined
    }

    const payloadPayload =
        "payload" in payload &&
            typeof payload.payload === "object" &&
            payload.payload !== null
            ? payload.payload
            : undefined

    let configLabelKey: string = key

    if (
        key in payload &&
        typeof payload[key as keyof typeof payload] === "string"
    ) {
        configLabelKey = payload[key as keyof typeof payload] as string
    } else if (
        payloadPayload &&
        key in payloadPayload &&
        typeof payloadPayload[key as keyof typeof payloadPayload] === "string"
    ) {
        configLabelKey = payloadPayload[
            key as keyof typeof payloadPayload
        ] as string
    }

    return configLabelKey in config
        ? config[configLabelKey]
        : config[key as keyof typeof config]
}

export {
    ChartContainer,
    ChartTooltip,
    ChartTooltipContent,
    ChartLegend,
    ChartLegendContent,
    ChartStyle,
}