"use client";
import React, { useState, useEffect, useCallback } from "react";
import FormPage from './FormPage';
import { ChatSetting } from "../exportType/types";
import { FormData, PROFICIENCY_LEVELS } from './formTypes';

// --- Helper function to get default form data ---
const getDefaultFormData = (): FormData => ({
  Hackathon: '',
  mainTheme: '',
  tracksStack: [''],
  students: [{
    studentName: '',
    skills: [{ skillName: '', proficiency: PROFICIENCY_LEVELS[1] }]
  }],
});

// --- New Initializer Function ---
const getInitialState = () => {
  if (typeof window === 'undefined') {
    return {
      data: getDefaultFormData(),
      showForm: true,
      runEffect: false
    };
  }
  const storedFormData = localStorage.getItem('formData');
  if (storedFormData) {
    localStorage.removeItem('formData');
    return {
      data: JSON.parse(storedFormData) as FormData,
      showForm: false,
      runEffect: true,
    };
  }
  return {
    data: getDefaultFormData(),
    showForm: true,
    runEffect: false
  };
};

// FIX 1 (Memoization): Moved settings OUTSIDE the component.
// This makes it a true constant.
const AI_SETTINGS: ChatSetting = {
  temperature: 1,
  model: "gemini-2.5-pro",
  sysTemInstructions: `You are an elite hackathon idea generator. Your task is to generate five different creative, feasible, and relevant project idea. 
The output MUST be in Markdown format and strictly follow this structure:
### Project Idea Title
<<<<<<< HEAD
**Track** [print out the track you used]
**Concept:** [A concise, single paragraph description of the product and its primary function.]`,
  });

  const parseAiResponse = (markdownString: string): CardData[] => {
    console.log("Raw AI Response:", markdownString);
    const ideas: CardData[] = [];
    const ideaBlocks = markdownString.split("### ").filter(block => block.trim() !== "");

    ideaBlocks.forEach((block, index) => {
      // Match title: anything from the start of the block until the first newline or the start of "**Track**"
      const titleMatch = block.match(/^(.*?)(?=\n\*\*Track\*\*|$)/s);
      // Match track: "**Track**" followed by optional whitespace and then capture everything until the next "**Concept**" or end of block/line
      const trackMatch = block.match(/\*\*Track\*\*\s*:\s*(.*?)(?=\n\*\*Concept\*\*|$)/s); // Added ':' and made whitespace more flexible
      // Match concept: "**Concept:**" followed by optional whitespace and then capture everything until the end of the block
      const conceptMatch = block.match(/\*\*Concept:\*\*\s*(.*)/s);

      const title = titleMatch ? titleMatch[1].trim() : `Idea ${index + 1}`;
      const summary = conceptMatch ? conceptMatch[1].trim() : "No concept provided.";
      const tracksRaw = trackMatch ? trackMatch[1].trim() : "";
      console.log("tracksRaw:", tracksRaw); // Added console.log for debugging
      const tracks = tracksRaw.split(',').map(track => track.trim()).filter(track => track !== '');

      ideas.push({
        id: index + 1,
        title,
        tracks,
        summary,
      });
    });
    console.log("Parsed Cards:", ideas);
    return ideas;
  };
=======
**Relevance to Theme:** [Explain briefly]
**Core Technology:** [List 3-5 primary technologies]
**Team Fit:** [How the team's skills apply]
**Concept:** [A concise, single paragraph description of the product and its primary function.]
**Bonus Feature:** [A single, ambitious feature to impress judges.]`,
};
>>>>>>> 44b5a4dc49ea757e9790ba8309edc6b37d764105

// ------------------------------------------------

export default function Home() {

  const [initialState] = useState(getInitialState);
  const [showForm, setShowForm] = useState(initialState.showForm);
  const [formData, setFormData] = useState<FormData>(initialState.data);
  const [ideaResponse, setIdeaResponse] = useState<string>("");

  // The 'settings' state [useState] is now removed from here.

  const handleFormSubmitFromFormPage = (submittedData: FormData) => {
    setFormData(submittedData);
    setShowForm(false);
    generateIdeas(submittedData);
  };

  // Wrapped generateIdeas in useCallback
  const generateIdeas = useCallback(async (dataToProcess: FormData) => {
    // 1. Data Cleaning
    const submissionData: FormData = {
      ...dataToProcess,
      tracksStack: dataToProcess.tracksStack.filter(tracks => tracks.trim() !== ''),
      students: dataToProcess.students
        .map(student => ({
          ...student,
          skills: student.skills.filter(skill => skill.skillName.trim() !== ''),
        }))
        .filter(student => student.studentName.trim() !== '' || student.skills.length > 0),
    };

    // 2. Prompt Construction
    const prompt = `
    Hackathon: ${submissionData.Hackathon}
    Main Theme: ${submissionData.mainTheme}
    Required Tracks Stack: ${submissionData.tracksStack.join(', ')}
    Team Members and Skills: ${submissionData.students.map(s =>
      `${s.studentName || 'Unamed Member'} (Skills: ${s.skills.map(sk => `${sk.skillName} - ${sk.proficiency}`).join(', ')})`
    ).join('; ')}
    
    Using the SYSTEM INSTRUCTIONS, generate 5 project ideas based on the data above.`;

    // 3. API Call
    try {
      setIdeaResponse("Generating ideas... Please wait.");
<<<<<<< HEAD
      setGeneratedCards([]); // Clear previous cards
      const response = await fetch("/api/generate-idea", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          prompt: prompt,
          settings: settings,
        }),
      });

      const data = await response.json();

=======

      const response = await fetch("/api/generate-idea", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          prompt: prompt,
          settings: AI_SETTINGS, // Use the constant
        }),
      });

      const data = await response.json();
>>>>>>> 44b5a4dc49ea757e9790ba8309edc6b37d764105
      if (data.error || !response.ok) {
        console.error("AI Error:", data.error);
        setIdeaResponse(`Error: Failed to generate idea. ${data.error || response.statusText}`);
        return;
<<<<<<< HEAD
      }

      setIdeaResponse(data.response);
      const parsedCards = parseAiResponse(data.response);
      setGeneratedCards(parsedCards);

    } catch (error) {
      console.error("Request Failed:", error);
      let errorMessage = "An unknown error occurred.";
      if (error instanceof Error) {
        errorMessage = error.message;
      } else if (typeof error === 'string') {
        errorMessage = error;
      }
      setIdeaResponse(`A network error occurred. Please try again. Details: ${errorMessage}`);
    }
  }, [setIdeaResponse, setGeneratedCards, settings, parseAiResponse]);

  useEffect(() => {
    if (typeof window !== 'undefined') {
      const storedFormData = localStorage.getItem('formData');
      if (storedFormData) {
        const parsedData: FormData = JSON.parse(storedFormData);
        setTimeout(() => setShowForm(false), 0);
        generateIdeas(parsedData);
        localStorage.removeItem('formData');
=======
>>>>>>> 44b5a4dc49ea757e9790ba8309edc6b37d764105
      }
      setIdeaResponse(data.response);

      // FIX 2 (Unexpected any): Changed 'any' to 'unknown' and added a type check.
    } catch (error: unknown) {
      console.error("Request Failed:", error);
      let errorMessage = "A network error occurred. Please try again.";
      if (error instanceof Error) {
        errorMessage += ` Details: ${error.message}`;
      }
      setIdeaResponse(errorMessage);
    }
    // FIX 3 (Linter): Disable the faulty memoization rule.
    // The empty array is correct because setIdeaResponse is a stable state setter.
    // eslint-disable-next-line react-hooks/preserve-manual-memoization
  }, []);

  // Replaced useEffect
  useEffect(() => {
    if (initialState.runEffect) {
      generateIdeas(initialState.data);
    }
  }, [initialState, generateIdeas]);

  // --- JSX Rendering ---
  return (
    <main className="min-h-screen bg-gray-50 flex items-start justify-center p-4 sm:p-6 font-inter">
      <div className="w-full max-w-2xl bg-white p-8 shadow-2xl rounded-xl mt-8">
        {showForm ? (
          <FormPage onFormSubmit={handleFormSubmitFromFormPage} />
        ) : (
          <>
<<<<<<< HEAD
            {generatedCards.length > 0 ? (
              <SwipeCards initialCards={generatedCards} />
            ) : (
              <>
                <h1 className="text-3xl font-extrabold text-center text-gray-800 mb-8 tracking-tight">
                  Generated Project Idea 💡
                </h1>
                <div className="mt-8 p-4 bg-yellow-50 rounded-lg border border-yellow-200">
                  <h2 className="text-xl font-bold text-gray-700 mb-2">Generated Ideas:</h2>
                  <div
                    className="prose max-w-none"
                    dangerouslySetInnerHTML={{ __html: ideaResponse.replace(/\n/g, '<br/>') }}
                  />
                  {ideaResponse === "" && <p className="text-gray-500">Submit the form to generate project ideas.</p>}
                </div>
              </>
            )}
=======
            <h1 className="text-3xl font-extrabold text-center text-gray-800 mb-8 tracking-tight">
              Generated Project Idea 💡
            </h1>
            <div className="mt-8 p-4 bg-yellow-50 rounded-lg border border-yellow-200">
              <h2 className="text-xl font-bold text-gray-700 mb-2">Generated Ideas:</h2>
              <div
                className="prose max-w-none"
                dangerouslySetInnerHTML={{ __html: ideaResponse.replace(/\n/g, '<br/>') }}
              />
              {ideaResponse === "" && <p className="text-gray-500">Submit the form to generate project ideas.</p>}
            </div>
>>>>>>> 44b5a4dc49ea757e9790ba8309edc6b37d764105
            <button
              onClick={() => setShowForm(true)}
              className="mt-6 w-full flex justify-center py-3 px-4 border border-transparent rounded-lg shadow-lg text-lg font-semibold text-white bg-blue-600 hover:bg-blue-700 transition duration-150"
            >
              Go Back to Form
            </button>
          </>
        )}
      </div>
    </main>
  );
}