"use client";

import { useId } from "react";
import type { LearningPathVariant, LearnAnythingFormData } from "./learnAnythingTypes";

const TUITION_EXAMPLE_CHIPS = [
  "Teach me +2 Physics motion in a straight line",
  "Explain Kerala Plus Two Chemistry electrochemistry",
  "Teach Boolean logic from zero",
  "Revise Class 10 Maths quadratic equations",
];

const GENERAL_EXAMPLE_CHIPS = [
  "Build a zero to advanced Python curriculum",
  "Teach me machine learning from scratch",
  "Create a business basics learning path",
  "Learn AI agents with projects",
];

const CLASS_OPTIONS = ["Class 8", "Class 9", "Class 10", "Plus One / Grade 11", "Plus Two / Grade 12"];
const SYLLABUS_OPTIONS = ["Kerala HSE", "CBSE", "ICSE", "State Board"];
const SUBJECT_OPTIONS = ["Physics", "Chemistry", "Mathematics", "Biology", "Computer Science", "Social Science"];
const DAILY_TIME_OPTIONS = ["30 minutes", "1 hour", "1.5 hours", "2 hours", "Exam-eve emergency mode"];
const TUITION_GOAL_OPTIONS = [
  { value: "full-marks", label: "Full marks" },
  { value: "a-plus", label: "A+" },
  { value: "strong-basics", label: "Strong basics" },
  { value: "pass", label: "Pass" },
  { value: "revision", label: "Revision" },
  { value: "exam-rescue", label: "Exam rescue" },
];
const GENERAL_GOAL_OPTIONS = [
  { value: "zero-to-advanced", label: "Zero to advanced" },
  { value: "job-skill", label: "Practical job skill" },
  { value: "project-based", label: "Project-based learning" },
  { value: "exam-or-interview", label: "Exam or interview prep" },
  { value: "quick-foundation", label: "Quick foundation" },
];
const LEVEL_OPTIONS = [
  { value: "beginner", label: "Beginner" },
  { value: "basic", label: "Basic" },
  { value: "average", label: "Average" },
  { value: "intermediate", label: "Intermediate" },
  { value: "advanced", label: "Advanced" },
];

interface LearnAnythingQueryBoxProps {
  formData: LearnAnythingFormData;
  onChange: (data: LearnAnythingFormData) => void;
  variant?: LearningPathVariant;
}

export function LearnAnythingQueryBox({ formData, onChange, variant = "general" }: LearnAnythingQueryBoxProps) {
  const id = useId();
  const isTuition = variant === "tuition";
  const examples = isTuition ? TUITION_EXAMPLE_CHIPS : GENERAL_EXAMPLE_CHIPS;
  const goalOptions = isTuition ? TUITION_GOAL_OPTIONS : GENERAL_GOAL_OPTIONS;

  const updateField = (field: keyof LearnAnythingFormData, value: string) => {
    onChange({ ...formData, [field]: value });
  };

  return (
    <div className="w-full space-y-4">
      <div className="relative">
        <label htmlFor={`${id}-query`} className="sr-only">
          {isTuition ? "What school concept do you want to study?" : "What skill or topic do you want to learn?"}
        </label>
        <textarea
          id={`${id}-query`}
          value={formData.query}
          onChange={(e) => updateField("query", e.target.value)}
          placeholder={
            isTuition
              ? "Tell DocDoe your class, syllabus, subject, chapter, or doubt..."
              : "Tell DocDoe the skill, topic, project, or outcome you want..."
          }
          className="w-full min-h-[120px] resize-none rounded-2xl border border-white/10 bg-white/[0.03] px-5 py-4 text-white placeholder:text-white/45 focus:outline-none focus:ring-2 focus:ring-white/20 focus:border-transparent transition-all scrollbar-thin scrollbar-thumb-white/20 scrollbar-track-transparent"
          aria-describedby={`${id}-description`}
        />
        <p id={`${id}-description`} className="sr-only">
          {isTuition
            ? "Enter a school topic, subject, chapter, doubt, or exam goal."
            : "Enter a skill, topic, project, or learning goal."}
        </p>
      </div>

      {formData.query.length === 0 && (
        <div className="flex flex-wrap gap-2">
          {examples.map((example) => (
            <button
              key={example}
              type="button"
              onClick={() => updateField("query", example)}
              className="rounded-lg border border-white/15 bg-white/[0.04] px-3 py-1.5 text-sm text-white/70 hover:bg-white/[0.08] hover:border-white/25 transition-colors"
            >
              {example}
            </button>
          ))}
        </div>
      )}

      {isTuition ? (
        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3">
          <SelectField
            id={`${id}-class`}
            label="Class"
            value={formData.classLevel}
            placeholder="Class not set"
            options={CLASS_OPTIONS}
            onChange={(value) => updateField("classLevel", value)}
          />
          <SelectField
            id={`${id}-syllabus`}
            label="Syllabus / Board"
            value={formData.syllabus}
            placeholder="Syllabus not set"
            options={SYLLABUS_OPTIONS}
            onChange={(value) => updateField("syllabus", value)}
          />
          <SelectField
            id={`${id}-subject`}
            label="Subject"
            value={formData.subject}
            placeholder="Subject not set"
            options={SUBJECT_OPTIONS}
            onChange={(value) => updateField("subject", value)}
          />
          <TextField
            id={`${id}-chapter`}
            label="Chapter / Topic"
            value={formData.chapter}
            placeholder="e.g. Ray Optics"
            onChange={(value) => updateField("chapter", value)}
          />
          <TextField
            id={`${id}-exam-date`}
            label="Exam Date"
            value={formData.examDate}
            type="date"
            onChange={(value) => updateField("examDate", value)}
          />
          <SelectField
            id={`${id}-daily-time`}
            label="Daily Study Time"
            value={formData.dailyStudyTime}
            placeholder="Time not set"
            options={DAILY_TIME_OPTIONS}
            onChange={(value) => updateField("dailyStudyTime", value)}
          />
          <SelectField
            id={`${id}-current-level`}
            label="Current Level"
            value={formData.currentLevel}
            placeholder="Level not set"
            options={LEVEL_OPTIONS}
            onChange={(value) => updateField("currentLevel", value)}
          />
          <TextField
            id={`${id}-weak-topics`}
            label="Weak Topics"
            value={formData.weakTopics}
            placeholder="e.g. derivations, units"
            onChange={(value) => updateField("weakTopics", value)}
          />
        </div>
      ) : (
        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3">
          <TextField
            id={`${id}-subject`}
            label="Skill Area"
            value={formData.subject}
            placeholder="e.g. Python, ML, business"
            onChange={(value) => updateField("subject", value)}
          />
          <SelectField
            id={`${id}-current-level`}
            label="Current Level"
            value={formData.currentLevel}
            placeholder="Level not set"
            options={LEVEL_OPTIONS}
            onChange={(value) => updateField("currentLevel", value)}
          />
          <SelectField
            id={`${id}-daily-time`}
            label="Daily Study Time"
            value={formData.dailyStudyTime}
            placeholder="Time not set"
            options={DAILY_TIME_OPTIONS.filter((option) => option !== "Exam-eve emergency mode")}
            onChange={(value) => updateField("dailyStudyTime", value)}
          />
        </div>
      )}

      <SelectField
        id={`${id}-goal`}
        label="Goal"
        value={formData.goal}
        placeholder="Goal not set"
        options={goalOptions}
        onChange={(value) => updateField("goal", value)}
      />
    </div>
  );
}

function fieldClassName() {
  return "w-full rounded-xl border border-white/10 bg-white/[0.03] px-4 py-2.5 text-white placeholder:text-white/45 focus:outline-none focus:ring-2 focus:ring-white/20 focus:border-transparent transition-all";
}

function FieldLabel({ id, label }: { id: string; label: string }) {
  return (
    <label htmlFor={id} className="block text-sm font-medium text-white/70 mb-1">
      {label}
    </label>
  );
}

function SelectField({
  id,
  label,
  value,
  placeholder,
  options,
  onChange,
}: {
  id: string;
  label: string;
  value: string;
  placeholder: string;
  options: Array<string | { value: string; label: string }>;
  onChange: (value: string) => void;
}) {
  return (
    <div>
      <FieldLabel id={id} label={label} />
      <select id={id} value={value} onChange={(e) => onChange(e.target.value)} className={fieldClassName()}>
        <option value="">{placeholder}</option>
        {options.map((option) => {
          const value = typeof option === "string" ? option : option.value;
          const label = typeof option === "string" ? option : option.label;
          return (
            <option key={value} value={value}>
              {label}
            </option>
          );
        })}
      </select>
    </div>
  );
}

function TextField({
  id,
  label,
  value,
  placeholder,
  type = "text",
  onChange,
}: {
  id: string;
  label: string;
  value: string;
  placeholder?: string;
  type?: "text" | "date";
  onChange: (value: string) => void;
}) {
  return (
    <div>
      <FieldLabel id={id} label={label} />
      <input
        id={id}
        value={value}
        type={type}
        placeholder={placeholder}
        onChange={(e) => onChange(e.target.value)}
        className={fieldClassName()}
      />
    </div>
  );
}