import { Check, X } from 'lucide-react'
import { cn, formatDateTime } from '@/lib/utils'

export type ApprovalStepState = 'done' | 'current' | 'upcoming' | 'failed'

export type ApprovalStep = {
  key: string
  label: string
  state: ApprovalStepState
  /** Who moved the record into this stage. */
  actor?: string
  at?: string
  hint?: string
}

const markerClasses: Record<ApprovalStepState, string> = {
  done: 'border-brand-500 bg-brand-500 text-white',
  current: 'border-orange bg-orange/10 text-orange-deep',
  upcoming: 'border-grayScale-200 bg-grayScale-100 text-grayScale-400',
  failed: 'border-destructive bg-destructive text-white',
}

const labelClasses: Record<ApprovalStepState, string> = {
  done: 'text-foreground',
  current: 'text-orange-deep',
  upcoming: 'text-grayScale-400',
  failed: 'text-destructive',
}

/**
 * Horizontal review progress for records that move through an approval
 * workflow. Stacks to a vertical list below `sm`.
 */
export function ApprovalStepper({ steps, className }: { steps: ApprovalStep[]; className?: string }) {
  return (
    <ol className={cn('flex flex-col gap-4 sm:flex-row sm:gap-0', className)}>
      {steps.map((step, index) => {
        const isLast = index === steps.length - 1
        const connectorDone = step.state === 'done'

        return (
          <li key={step.key} className="flex min-w-0 gap-3 sm:flex-1 sm:flex-col sm:gap-0">
            <div className="flex flex-col items-center sm:w-full sm:flex-row">
              <span
                className={cn(
                  'flex h-7 w-7 shrink-0 items-center justify-center rounded-full border-2 text-[11px] font-semibold',
                  markerClasses[step.state],
                )}
              >
                {step.state === 'done' ? (
                  <Check className="h-3.5 w-3.5" aria-hidden="true" />
                ) : step.state === 'failed' ? (
                  <X className="h-3.5 w-3.5" aria-hidden="true" />
                ) : (
                  index + 1
                )}
              </span>
              {!isLast ? (
                <span
                  className={cn(
                    'my-1 w-0.5 flex-1 rounded-full sm:my-0 sm:ml-2 sm:h-0.5 sm:w-auto',
                    connectorDone ? 'bg-brand-300' : 'bg-grayScale-200',
                  )}
                  aria-hidden="true"
                />
              ) : null}
            </div>
            <div className={cn('min-w-0 pb-1 sm:mt-3 sm:pr-4', isLast && 'sm:pr-0')}>
              <p className={cn('text-sm font-semibold', labelClasses[step.state])}>{step.label}</p>
              {step.actor ? (
                <p className="mt-0.5 truncate text-xs text-muted-foreground">{step.actor}</p>
              ) : null}
              {step.at ? (
                <p className="mt-0.5 text-[11px] text-muted-foreground">{formatDateTime(step.at)}</p>
              ) : null}
              {step.hint ? <p className="mt-0.5 text-[11px] text-grayScale-400">{step.hint}</p> : null}
            </div>
          </li>
        )
      })}
    </ol>
  )
}