import React, { useState } from "react";

const ExamBuilder = () => {
  const [paper, setPaper] = useState({
    id: "",
    title: "",
    data: {
      metadata: {
        type: "single",
        marking: "",
        duration: 0,
        quantity: 0,
      },
      questions: [
        {
          id: 1,
          type: "single",
          options: {
            a: "",
            b: "",
            c: "",
            d: "",
          },
          question: "",
          solution: "",
          correctAnswer: "",
        },
      ],
    },
  });

  const handleChange = (e) => {
    const { name, value } = e.target;
    setPaper((prev) => ({
      ...prev,
      [name]: value,
    }));
  };

  const handleMetadataChange = (e) => {
    const { name, value } = e.target;
    setPaper((prev) => ({
      ...prev,
      data: {
        ...prev.data,
        metadata: {
          ...prev.data.metadata,
          [name]: value,
        },
      },
    }));
  };

  const handleQuestionChange = (index, field, value) => {
    const updatedQuestions = paper.data.questions.map((q, i) =>
      i === index ? { ...q, [field]: value } : q
    );
    setPaper((prev) => ({
      ...prev,
      data: { ...prev.data, questions: updatedQuestions },
    }));
  };

  const handleOptionChange = (index, optionKey, value) => {
    const updatedQuestions = paper.data.questions.map((q, i) =>
      i === index ? { ...q, options: { ...q.options, [optionKey]: value } } : q
    );
    setPaper((prev) => ({
      ...prev,
      data: { ...prev.data, questions: updatedQuestions },
    }));
  };

  const addQuestion = () => {
    setPaper((prev) => ({
      ...prev,
      data: {
        ...prev.data,
        questions: [
          ...prev.data.questions,
          {
            id: prev.data.questions.length + 1,
            type: "single",
            options: { a: "", b: "", c: "", d: "" },
            question: "",
            solution: "",
            correctAnswer: "",
          },
        ],
      },
    }));
  };

  const handleSubmit = (e) => {
    e.preventDefault();
    console.log("Exam Paper Submitted: ", paper);
  };

  return (
    <section className="flex w-3/4 gap-10 h-fit">
      <section className="border-1 border-blue-100 rounded-2xl mt-5 py-10 px-10 max-h-[70vh] w-1/2">
        <h1 className="text-white text-3xl font-bold text-center mb-6">
          Exam Builder
        </h1>
        <form className="flex flex-col gap-4" onSubmit={handleSubmit}>
          <h2 className="text-white text-2xl">General Information</h2>
          <input
            type="text"
            name="title"
            value={paper.title}
            onChange={handleChange}
            placeholder="Exam Title"
            className="bg-white w-full rounded-full py-3 px-6"
          />

          <h2 className="text-white text-2xl">Metadata</h2>
          <select
            name="type"
            value={paper.data.metadata.type}
            onChange={handleMetadataChange}
            className="bg-white p-4 rounded-full"
          >
            <option value="single">Multiple Choice Questions (Single)</option>
            <option value="multiple">
              Multiple Choice Questions (Multiple)
            </option>
          </select>
          <input
            type="text"
            name="marking"
            value={paper.data.metadata.marking}
            onChange={handleMetadataChange}
            placeholder="Marking"
            className="bg-white w-full rounded-full py-3 px-6"
          />
          <input
            type="number"
            name="duration"
            value={paper.data.metadata.duration}
            onChange={handleMetadataChange}
            placeholder="Duration"
            className="bg-white w-full rounded-full py-3 px-6"
          />
          <input
            type="number"
            name="quantity"
            value={paper.data.metadata.quantity}
            onChange={handleMetadataChange}
            placeholder="How many questions?"
            className="bg-white w-full rounded-full py-3 px-6"
          />

          <button
            type="submit"
            className="bg-blue-500 text-white p-3 rounded-full mt-4"
          >
            Submit Exam
          </button>
        </form>
      </section>
      <section className="border-1 border-blue-100 rounded-2xl mt-5 py-10 px-10 w-1/2">
        <h1 className="text-white text-3xl font-bold text-center mb-6">
          Questions
        </h1>
        {paper.data.questions.map((question, index) => (
          <div key={index} className="rounded-lg">
            <h2 className="text-white text-xl mb-4">Question {index + 1}</h2>
            <input
              type="text"
              value={question.question}
              onChange={(e) =>
                handleQuestionChange(index, "question", e.target.value)
              }
              placeholder="Question"
              className="bg-white w-full rounded-full py-3 px-6 mb-2"
            />
            <div className="">
              {Object.keys(question.options).map((key) => (
                <div key={key} className="flex items-center gap-2 mb-2">
                  <h3 className="text-white uppercase  py-3 px-5 rounded-full bg-blue-600">
                    {key}
                  </h3>
                  <input
                    type="text"
                    value={question.options[key]}
                    onChange={(e) =>
                      handleOptionChange(index, key, e.target.value)
                    }
                    placeholder={`Option ${key.toUpperCase()}`}
                    className="bg-white w-full rounded-full py-3 px-6"
                  />
                </div>
              ))}
            </div>

            <input
              type="text"
              value={question.correctAnswer.toLowerCase()}
              onChange={(e) =>
                handleQuestionChange(index, "correctAnswer", e.target.value)
              }
              placeholder="Correct answer (a, b, c, d)"
              className="bg-white w-full rounded-full py-3 px-6 mt-2"
            />
            <input
              type="text"
              value={question.solution}
              onChange={(e) =>
                handleQuestionChange(index, "solution", e.target.value)
              }
              placeholder="Solution"
              className="bg-white w-full rounded-full py-3 px-6 mt-2"
            />
          </div>
        ))}

        <button
          type="button"
          onClick={addQuestion}
          className="bg-green-500 text-white p-3 rounded-full mt-2"
        >
          Add Question
        </button>
      </section>
    </section>
  );
};

export default ExamBuilder;

{
  /*  */
}