"use client"

import React from "react"
import { Plus, Trash2 } from "lucide-react"

export interface StatItem {
  label: string
  value: string
}

export interface StatsSectionData {
  title: string
  stats: StatItem[]
}

interface Props {
  value: StatsSectionData
  onChange: (value: StatsSectionData) => void
  showValidation?: boolean
}

function fieldClass(invalid = false) {
  return `w-full bg-card border rounded-xl px-3 py-2.5 text-sm text-foreground font-sans placeholder:text-muted-foreground outline-none transition-colors focus:ring-2 ${
    invalid
      ? "border-red-400 focus:ring-red-200/70 focus:border-red-500"
      : "border-border focus:ring-[#2BB673]/30 focus:border-[#2BB673]"
  }`
}

function Label({ children }: { children: React.ReactNode }) {
  return (
    <label className="text-xs font-bold text-foreground font-sans uppercase tracking-wider">
      {children}
    </label>
  )
}

export function StatsSection({ value, onChange, showValidation = false }: Props) {
  function set<K extends keyof StatsSectionData>(key: K, val: StatsSectionData[K]) {
    onChange({ ...value, [key]: val })
  }

  function addStat() {
    set("stats", [...value.stats, { label: "", value: "" }])
  }

  function removeStat(index: number) {
    set("stats", value.stats.filter((_, i) => i !== index))
  }

  function updateStat(index: number, field: keyof StatItem, val: string) {
    set("stats", value.stats.map((s, i) => (i === index ? { ...s, [field]: val } : s)))
  }

  return (
    <div className="flex flex-col gap-5">
      {/* Section title */}
      <div className="flex flex-col gap-1.5">
        <Label>Title</Label>
        <input
          type="text"
          value={value.title}
          onChange={(e) => set("title", e.target.value)}
          placeholder="e.g. Our Numbers Speak for Themselves"
          className={fieldClass(showValidation && !value.title.trim())}
        />
      </div>

      {/* Stats array */}
      <div className={`flex flex-col gap-3 rounded-xl ${showValidation && value.stats.length === 0 ? "border border-red-300 p-3 bg-red-50/40" : ""}`}>
        <div className="flex items-center justify-between">
          <Label>Stats</Label>
          <button
            type="button"
            onClick={addStat}
            className="flex cursor-pointer items-center gap-1.5 px-3 py-1.5 rounded-lg text-xs font-semibold font-sans transition-all hover:brightness-105 active:scale-[0.98]"
            style={{ background: "rgba(43,182,115,0.10)", color: "var(--brand-green)" }}
          >
            <Plus className="w-3.5 h-3.5" aria-hidden="true" />
            Add Stat
          </button>
        </div>

        {value.stats.length === 0 ? (
          <div className="flex flex-col items-center justify-center gap-2 py-8 rounded-xl border border-dashed border-border">
            <p className="text-xs text-muted-foreground font-sans">No stats yet.</p>
            <button
              type="button"
              onClick={addStat}
              className="text-xs cursor-pointer font-semibold font-sans"
              style={{ color: "var(--brand-green)" }}
            >
              Add your first stat
            </button>
          </div>
        ) : (
          <div className="flex flex-col gap-3">
            {value.stats.map((stat, index) => (
              <div
                key={index}
                className="flex flex-col gap-3 p-4 rounded-xl border border-border bg-muted/40"
              >
                <div className="flex items-center justify-between">
                  <span
                    className="text-xs font-bold font-sans px-2 py-0.5 rounded-md"
                    style={{ background: "rgba(29,45,104,0.08)", color: "var(--brand-navy)" }}
                  >
                    Stat {index + 1}
                  </span>
                  <button
                    type="button"
                    onClick={() => removeStat(index)}
                    className="p-1.5 cursor-pointer rounded-lg text-muted-foreground hover:text-red-500 hover:bg-red-50 transition-colors"
                    aria-label={`Remove stat ${index + 1}`}
                  >
                    <Trash2 className="w-3.5 h-3.5" aria-hidden="true" />
                  </button>
                </div>
                <div className="grid grid-cols-2 gap-3">
                <div className="flex flex-col gap-1.5">
                    <label className="text-xs font-semibold text-muted-foreground font-sans">Label</label>
                    <input
                      type="text"
                      value={stat.label}
                      onChange={(e) => updateStat(index, "label", e.target.value)}
                      placeholder="e.g. Happy Patients"
                      className={fieldClass(showValidation && !stat.label.trim())}
                    />
                  </div>
                  <div className="flex flex-col gap-1.5">
                    <label className="text-xs font-semibold text-muted-foreground font-sans">Value</label>
                    <input
                      type="text"
                      value={stat.value}
                      onChange={(e) => updateStat(index, "value", e.target.value)}
                      placeholder="e.g. 5000+"
                      className={fieldClass(showValidation && !stat.value.trim())}
                    />
                  </div>
                  
                </div>
              </div>
            ))}
          </div>
        )}
      </div>
    </div>
  )
}