"use client"

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

export interface ImpactItem {
  value: string
  label: string
}

export interface ImpactSectionData {
  title: string
  items: ImpactItem[]
}

interface Props {
  value: ImpactSectionData
  onChange: (value: ImpactSectionData) => void
  validation?: {
    title?: boolean
    items?: boolean
    itemErrors?: Array<{ label?: boolean; value?: 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 ImpactSection({ value, onChange, validation }: Props) {
  function set<K extends keyof ImpactSectionData>(key: K, val: ImpactSectionData[K]) {
    onChange({ ...value, [key]: val })
  }

  function addItem() {
    set("items", [...value.items, { value: "", label: "" }])
  }

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

  function updateItem(index: number, field: keyof ImpactItem, val: string) {
    set("items", value.items.map((item, i) => (i === index ? { ...item, [field]: val } : item)))
  }

  return (
    <div className="flex flex-col gap-5">
      <div className="flex flex-col gap-1.5">
        <Label>Section Title</Label>
        <input
          type="text"
          value={value.title}
          onChange={(e) => set("title", e.target.value)}
          placeholder="e.g. Our Global Impact"
          className={fieldClass(!!validation?.title)}
        />
      </div>

      {/* Items */}
      <div
        className={`flex flex-col gap-3 rounded-xl ${
          validation?.items && value.items.length === 0 ? "border border-red-300 p-3 bg-red-50/40" : ""
        }`}
      >
        <div className="flex items-center justify-between">
          <Label>Impact Items</Label>
          <button
            type="button"
            onClick={addItem}
            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 Item
          </button>
        </div>

        {value.items.length === 0 ? (
          <div className="flex flex-col items-center justify-center gap-2 py-6 rounded-xl border border-dashed border-border">
            <p className="text-xs text-muted-foreground font-sans">No impact items yet.</p>
            <button
              type="button"
              onClick={addItem}
              className="text-xs cursor-pointer font-semibold font-sans"
              style={{ color: "var(--brand-green)" }}
            >
              Add your first item
            </button>
          </div>
        ) : (
          <div className="grid grid-cols-1 sm:grid-cols-2 gap-3">
            {value.items.map((item, index) => (
              <div
                key={index}
                className="flex flex-col gap-2 p-3 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(43,182,115,0.10)", color: "var(--brand-green)" }}
                  >
                    Item {index + 1}
                  </span>
                  <button
                    type="button"
                    onClick={() => removeItem(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 item ${index + 1}`}
                  >
                    <Trash2 className="w-3.5 h-3.5" aria-hidden="true" />
                  </button>
                </div>
                <input
                  type="text"
                  value={item.value}
                  onChange={(e) => updateItem(index, "value", e.target.value)}
                  placeholder="e.g. 15,000+"
                  className={fieldClass(!!validation?.itemErrors?.[index]?.value)}
                />
                <input
                  type="text"
                  value={item.label}
                  onChange={(e) => updateItem(index, "label", e.target.value)}
                  placeholder="e.g. Procedures Performed"
                  className={fieldClass(!!validation?.itemErrors?.[index]?.label)}
                />
              </div>
            ))}
          </div>
        )}
      </div>
    </div>
  )
}