"use client";

import { useState } from "react";
import { ClipboardCheck, LoaderCircle, Send } from "lucide-react";
import { generateBrainAnswerCorrection } from "@/lib/api/brain";
import type { BrainAnswerCorrectionOutput, BrainGenerationResponse } from "@/lib/api/types";
import type { ApiDocument } from "@/lib/api/types";

type AnswerCorrectionFormProps = {
  selectedDocuments: ApiDocument[];
  onSubmit: (result: BrainGenerationResponse<BrainAnswerCorrectionOutput>, question: string, studentAnswer: string) => void;
  onCancel: () => void;
};

export function AnswerCorrectionForm({
  selectedDocuments,
  onSubmit,
  onCancel,
}: AnswerCorrectionFormProps) {
  const [question, setQuestion] = useState("");
  const [studentAnswer, setStudentAnswer] = useState("");
  const [marks, setMarks] = useState<string>("not_sure");
  const [subject, setSubject] = useState(selectedDocuments[0]?.subject ?? "");
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const canSubmit = question.trim().length > 0 && studentAnswer.trim().length > 0 && !isSubmitting;

  async function handleSubmit() {
    if (!canSubmit) return;
    setIsSubmitting(true);
    setError(null);

    try {
      const sourceIds = selectedDocuments.filter((d) => d.status === "ready").map((d) => d.id);
      const result = await generateBrainAnswerCorrection({
        topic: question,
        subject: subject || undefined,
        source_id: sourceIds[0] || undefined,
        source_ids: sourceIds.length > 0 ? sourceIds : undefined,
        language_preference: "English",
        options: {
          mode: "answer_correction",
          question,
          student_answer: studentAnswer,
          marks,
          subject: subject || undefined,
        },
      });
      onSubmit(result, question, studentAnswer);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Correction failed. Please try again.");
      setIsSubmitting(false);
    }
  }

  return (
    <div className="animate-msg-assistant w-full rounded-xl border border-white/[0.06] bg-[#080809] p-5">
      <div className="mb-4 flex items-center gap-2.5">
        <ClipboardCheck className="size-4 shrink-0 text-emerald-400/70" />
        <div>
          <span className="text-[10px] font-medium uppercase tracking-[0.08em] text-white/22">Answer Correction</span>
          <p className="text-[14px] font-semibold text-white/90">Find marks lost and rewrite in board format</p>
        </div>
      </div>

      {selectedDocuments.length > 0 && (
        <p className="mb-3 text-[11px] text-white/30">
          Using: {selectedDocuments.map((d) => d.title).join(", ")}
        </p>
      )}

      <div className="grid gap-3">
        <label className="grid gap-1.5">
          <span className="text-[10px] font-bold uppercase tracking-[0.12em] text-white/30">Question</span>
          <textarea
            value={question}
            onChange={(e) => setQuestion(e.target.value)}
            rows={2}
            placeholder="Paste the exam question"
            className="min-h-16 resize-none rounded-xl border border-white/[0.07] bg-black/30 px-3 py-2.5 text-[13px] leading-5 text-white/80 outline-none placeholder:text-white/25 focus:border-emerald-400/30"
          />
        </label>

        <label className="grid gap-1.5">
          <span className="text-[10px] font-bold uppercase tracking-[0.12em] text-white/30">Your answer</span>
          <textarea
            value={studentAnswer}
            onChange={(e) => setStudentAnswer(e.target.value)}
            rows={4}
            placeholder="Paste what you wrote"
            className="min-h-24 resize-none rounded-xl border border-white/[0.07] bg-black/30 px-3 py-2.5 text-[13px] leading-5 text-white/80 outline-none placeholder:text-white/25 focus:border-emerald-400/30"
          />
        </label>

        <div className="grid gap-2 sm:grid-cols-[minmax(0,1fr)_120px]">
          <label className="grid gap-1.5">
            <span className="text-[10px] font-bold uppercase tracking-[0.12em] text-white/30">Subject or chapter</span>
            <input
              value={subject}
              onChange={(e) => setSubject(e.target.value)}
              placeholder="Optional"
              className="h-10 rounded-xl border border-white/[0.07] bg-black/30 px-3 text-[13px] text-white/80 outline-none placeholder:text-white/25 focus:border-emerald-400/30"
            />
          </label>
          <label className="grid gap-1.5">
            <span className="text-[10px] font-bold uppercase tracking-[0.12em] text-white/30">Marks</span>
            <select
              value={marks}
              onChange={(e) => setMarks(e.target.value)}
              className="h-10 rounded-xl border border-white/[0.07] bg-black/30 px-3 text-[13px] text-white/80 outline-none focus:border-emerald-400/30"
            >
              <option value="not_sure">Not sure</option>
              <option value="1">1</option>
              <option value="2">2</option>
              <option value="3">3</option>
              <option value="4">4</option>
              <option value="5">5</option>
              <option value="6">6</option>
            </select>
          </label>
        </div>
      </div>

      {error && (
        <p className="mt-2 text-[12px] text-red-400/80">{error}</p>
      )}

      <div className="mt-4 flex items-center gap-2">
        <button
          type="button"
          onClick={handleSubmit}
          disabled={!canSubmit}
          className="inline-flex h-9 items-center justify-center gap-2 rounded-xl bg-emerald-600/90 px-4 text-[12px] font-bold text-white shadow-[0_0_16px_rgba(16,185,129,0.15)] transition hover:bg-emerald-500 active:scale-95 disabled:cursor-not-allowed disabled:opacity-40"
        >
          {isSubmitting ? (
            <LoaderCircle className="size-3.5 animate-spin" />
          ) : (
            <Send className="size-3.5" />
          )}
          {isSubmitting ? "Correcting..." : "Correct answer"}
        </button>
        <button
          type="button"
          onClick={onCancel}
          className="inline-flex h-9 items-center justify-center rounded-xl border border-white/[0.08] px-4 text-[12px] font-medium text-white/50 transition hover:border-white/20 hover:text-white/80"
        >
          Cancel
        </button>
      </div>
    </div>
  );
}