import React from 'react';

type StepStatus = 'wait' | 'process' | 'finish';

/**
 * StepItem 用于描述步骤条的单个步骤信息
 */
export interface StepItem {
    /** 步骤标题 */
    title: string;
    /** 步骤的说明文本（可选） */
    description?: string;
    /** 步骤序号（可选） */
    number?: number;
    /** 步骤状态，可选: wait | process | finish，默认为 wait */
    status?: StepStatus;
    /** 可自定义扩展内容（可选） */
    extra?: React.ReactNode;
}

export interface StepProps {
    steps: StepItem[];
    className?: string;
    showArrow?: boolean;
    onStepClick?: (step: StepItem, index: number) => void;
}

const gradientPresets = [
    'bg-gradient-to-r from-[#95D3F4] to-white',
    'bg-gradient-to-r from-[#9ABEFF] to-white',
    'bg-gradient-to-r from-[#87CEFA] to-white',
];

const statusRingMap: Record<StepStatus, string> = {
    wait: 'ring-1 ring-slate-200',
    process: 'ring-2 ring-[#4195E5]',
    finish: 'ring-2 ring-emerald-300',
};

const statusTitleMap: Record<StepStatus, string> = {
    wait: 'text-gray-900',
    process: 'text-[#1d5fbf]',
    finish: 'text-emerald-700',
};

const cx = (...classNames: Array<string | false | undefined>) => classNames.filter(Boolean).join(' ');

const Step: React.FC<StepProps> = ({ steps, className, showArrow = true, onStepClick }) => {
    if (!steps?.length) {
        return null;
    }

    return (
        <div className={cx('flex items-center w-full', className)}>
            {steps.map((step, index) => {
                const status = step.status ?? 'wait';
                const gradient = gradientPresets[index % gradientPresets.length];
                const card = (
                    <div
                        key={step.title ?? index}
                        className={cx(
                            'relative h-[100px] flex-1 rounded-xl p-6 shadow-md transition-all duration-200 flex flex-col justify-center',
                            gradient,
                            statusRingMap[status],
                            onStepClick && 'cursor-pointer hover:-translate-y-1',
                        )}
                        onClick={() => onStepClick?.(step, index)}
                    >
                        <div className="absolute top-3 right-4 text-right italic">
                            <div className="text-3xl font-bold text-[#4195E5]">{step.number ?? index + 1}</div>
                            <div className="text-xs font-medium text-[#4195E5] text-opacity-80 uppercase">step</div>
                        </div>
                        <p className={cx('mb-2 text-lg font-semibold', statusTitleMap[status])}>{step.title}</p>
                        {step.description && (
                            <p className="text-sm leading-relaxed text-gray-600 w-[80%]">{step.description}</p>
                        )}
                        {step.extra && <div className="mt-3">{step.extra}</div>}
                    </div>
                );

                return (
                    <React.Fragment key={`${step.title}-${index}`}>
                        {card}
                        {showArrow && index < steps.length - 1 && (
                            <div className="mx-3 text-lg font-semibold text-gray-400">{'>'}</div>
                        )}
                    </React.Fragment>
                );
            })}
        </div>
    );
};

Step.displayName = 'Step';

export default Step;