"use client"

import { Plus, Trash2 } from "lucide-react"
import type {
  ProceduresFAQSectionData,
  ProceduresFAQItem,
} from "@/lib/pages/procedures-page/form-types"

interface Props {
  value: ProceduresFAQSectionData
  onChange: (value: ProceduresFAQSectionData) => void
  disabled?: boolean
  validation?: {
    eyebrow?: boolean
    title?: boolean
    faqs?: boolean
    faqItems?: Array<{ question?: boolean; answer?: 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 ProceduresFAQSection({ value, onChange, disabled = false, validation }: Props) {
  function set<K extends keyof ProceduresFAQSectionData>(key: K, val: ProceduresFAQSectionData[K]) {
    onChange({ ...value, [key]: val })
  }

  function addFAQ() {
    if (disabled) return
    set("faqs", [...value.faqs, { question: "", answer: "" }])
  }

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

  function updateFAQ(index: number, field: keyof ProceduresFAQItem, val: string) {
    set(
      "faqs",
      value.faqs.map((f, i) => (i === index ? { ...f, [field]: val } : f))
    )
  }

  return (
    <div className="flex flex-col gap-5">
      {/* Eyebrow */}
      <div className="flex flex-col gap-1.5">
        <Label>Eyebrow</Label>
        <input
          type="text"
          value={value.eyebrow}
          disabled={disabled}
          onChange={(e) => set("eyebrow", e.target.value)}
          placeholder="e.g. Frequently Asked Questions"
          className={fieldClass(!!validation?.eyebrow)}
        />
      </div>

      {/* Title */}
      <div className="flex flex-col gap-1.5">
        <Label>Title</Label>
        <input
          type="text"
          value={value.title}
          disabled={disabled}
          onChange={(e) => set("title", e.target.value)}
          placeholder="e.g. Everything You Need to Know"
          className={fieldClass(!!validation?.title)}
        />
      </div>

      {/* FAQs */}
      <div
        className={`flex flex-col gap-3 rounded-xl ${
          validation?.faqs && value.faqs.length === 0
            ? "border border-red-300 p-3 bg-red-50/40"
            : ""
        }`}
      >
        <div className="flex items-center justify-between gap-2">
          <div className="flex flex-col gap-0.5">
            <Label>FAQ Items</Label>
            <span className="text-xs text-muted-foreground font-sans">Each FAQ has a question and an answer</span>
          </div>
          <button
            type="button"
            onClick={addFAQ}
            disabled={disabled}
            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] disabled:opacity-50 disabled:cursor-not-allowed"
            style={{ background: "rgba(43,182,115,0.10)", color: "var(--brand-green)" }}
          >
            <Plus className="w-3.5 h-3.5" aria-hidden="true" />
            Add FAQ
          </button>
        </div>

        {value.faqs.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 FAQ items yet.</p>
            <button
              type="button"
              onClick={addFAQ}
              disabled={disabled}
              className="text-xs font-semibold font-sans disabled:opacity-50"
              style={{ color: "var(--brand-green)" }}
            >
              Add your first FAQ
            </button>
          </div>
        ) : (
          <div className="flex flex-col gap-3">
            {value.faqs.map((faq, index) => {
              const err = validation?.faqItems?.[index]
              return (
                <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)" }}
                    >
                      FAQ {index + 1}
                    </span>
                    <button
                      type="button"
                      onClick={() => removeFAQ(index)}
                      disabled={disabled}
                      className="p-1.5 cursor-pointer rounded-lg text-muted-foreground hover:text-red-500 hover:bg-red-50 transition-colors"
                      aria-label={`Remove FAQ ${index + 1}`}
                    >
                      <Trash2 className="w-3.5 h-3.5" aria-hidden="true" />
                    </button>
                  </div>

                  <div className="flex flex-col gap-1.5">
                    <label className="text-xs font-semibold text-muted-foreground font-sans">Question</label>
                    <input
                      type="text"
                      value={faq.question}
                      disabled={disabled}
                      onChange={(e) => updateFAQ(index, "question", e.target.value)}
                      placeholder="e.g. How long does recovery take?"
                      className={fieldClass(!!err?.question)}
                    />
                  </div>

                  <div className="flex flex-col gap-1.5">
                    <label className="text-xs font-semibold text-muted-foreground font-sans">Answer</label>
                    <textarea
                      value={faq.answer}
                      disabled={disabled}
                      onChange={(e) => updateFAQ(index, "answer", e.target.value)}
                      placeholder="Write the answer to this question..."
                      rows={4}
                      className={`${fieldClass(!!err?.answer)} resize-none leading-relaxed`}
                    />
                  </div>
                </div>
              )
            })}
          </div>
        )}
      </div>
    </div>
  )
}