import { useState, useCallback, } from 'react';
import Box from '@mui/material/Box';
import { SeverityType } from './Snack';
import { ContextStatus } from './ContextStatus';
import { MessageData } from './MessageMeta';
import { DocumentViewer } from './DocumentViewer';

interface ResumeBuilderProps {
  scrollToBottom: () => void,
  isScrolledToBottom: () => boolean,
  setProcessing: (processing: boolean) => void,
  processing: boolean,
  connectionBase: string,
  sessionId: string | undefined,
  setSnack: (message: string, severity?: SeverityType) => void,
};

const ResumeBuilder = ({ scrollToBottom, isScrolledToBottom, setProcessing, processing, connectionBase, sessionId, setSnack }: ResumeBuilderProps) => {
  const [lastEvalTPS, setLastEvalTPS] = useState<number>(35);
  const [lastPromptTPS, setLastPromptTPS] = useState<number>(430);
  const [contextStatus, setContextStatus] = useState<ContextStatus>({ context_used: 0, max_context: 0 });
  //  const [countdown, setCountdown] = useState<number>(0);
  const [resume, setResume] = useState<MessageData | undefined>(undefined);
  const [facts, setFacts] = useState<MessageData | undefined>(undefined);
  //  const timerRef = useRef<any>(null);

  const updateContextStatus = useCallback(() => {
    fetch(connectionBase + `/api/context-status/${sessionId}`, {
      method: 'GET',
      headers: {
        'Content-Type': 'application/json',
      },
    })
      .then(response => response.json())
      .then(data => {
        setContextStatus(data);
      })
      .catch(error => {
        console.error('Error getting context status:', error);
        setSnack("Unable to obtain context status.", "error");
      });
  }, [setContextStatus, connectionBase, setSnack, sessionId]);

  // const startCountdown = (seconds: number) => {
  //   if (timerRef.current) clearInterval(timerRef.current);
  //   setCountdown(seconds);
  //   timerRef.current = setInterval(() => {
  //     setCountdown((prev) => {
  //       if (prev <= 1) {
  //         clearInterval(timerRef.current);
  //         timerRef.current = null;
  //         if (isScrolledToBottom()) {
  //           setTimeout(() => {
  //             scrollToBottom();
  //           }, 50)
  //         }
  //         return 0;
  //       }
  //       return prev - 1;
  //     });
  //   }, 1000);
  // };

  // const stopCountdown = () => {
  //   if (timerRef.current) {
  //     clearInterval(timerRef.current);
  //     timerRef.current = null;
  //     setCountdown(0);
  //   }
  // };

  if (sessionId === undefined) {
    return (<></>);
  }

  const generateResume = async (jobDescription: string) => {
    if (!jobDescription.trim()) return;
    setResume(undefined);

    try {
      setProcessing(true);

      // Add initial processing message
      //setGenerateStatus({ role: 'assistant', content: 'Processing request...' });

      // Make the fetch request with proper headers
      const response = await fetch(connectionBase + `/api/generate-resume/${sessionId}`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/json',
        },
        body: JSON.stringify({ content: jobDescription.trim() }),
      });

      // We'll guess that the response will be around 500 tokens...
      const token_guess = 500;
      const estimate = Math.round(token_guess / lastEvalTPS + contextStatus.context_used / lastPromptTPS);

      setSnack(`Job description sent. Response estimated in ${estimate}s.`, "info");
      //startCountdown(Math.round(estimate));

      if (!response.ok) {
        throw new Error(`Server responded with ${response.status}: ${response.statusText}`);
      }

      if (!response.body) {
        throw new Error('Response body is null');
      }

      // Set up stream processing with explicit chunking
      const reader = response.body.getReader();
      const decoder = new TextDecoder();
      let buffer = '';

      while (true) {
        const { done, value } = await reader.read();
        if (done) {
          break;
        }

        const chunk = decoder.decode(value, { stream: true });

        // Process each complete line immediately
        buffer += chunk;
        let lines = buffer.split('\n');
        buffer = lines.pop() || ''; // Keep incomplete line in buffer
        for (const line of lines) {
          if (!line.trim()) continue;

          try {
            const update = JSON.parse(line);

            // Force an immediate state update based on the message type
            if (update.status === 'processing') {
              // Update processing message with immediate re-render
              //setGenerateStatus({ role: 'info', content: update.message });
              console.log(update.num_ctx);

              // Add a small delay to ensure React has time to update the UI
              await new Promise(resolve => setTimeout(resolve, 0));

            } else if (update.status === 'done') {
              // Replace processing message with final result
              //setGenerateStatus(undefined);
              setResume(update.message);
              const metadata = update.message.metadata;
              const evalTPS = metadata.eval_count * 10 ** 9 / metadata.eval_duration;
              const promptTPS = metadata.prompt_eval_count * 10 ** 9 / metadata.prompt_eval_duration;
              setLastEvalTPS(evalTPS ? evalTPS : 35);
              setLastPromptTPS(promptTPS ? promptTPS : 35);
              updateContextStatus();
            } else if (update.status === 'error') {
              // Show error
              //setGenerateStatus({ role: 'error', content: update.message });
            }
          } catch (e) {
            setSnack("Error generating resume", "error")
            console.error('Error parsing JSON:', e, line);
          }
        }
      }

      // Process any remaining buffer content
      if (buffer.trim()) {
        try {
          const update = JSON.parse(buffer);

          if (update.status === 'done') {
            //setGenerateStatus(undefined);
            setResume(update.message);
          }
        } catch (e) {
          setSnack("Error processing job description", "error")
        }
      }

      //stopCountdown();
      setProcessing(false);
    } catch (error) {
      console.error('Fetch error:', error);
      setSnack("Unable to process job description", "error");
      //setGenerateStatus({ role: 'error', content: `Error: ${error}` });
      setProcessing(false);
      //stopCountdown();
    }
  };

  const factCheck = async (resume: string) => {
    if (!resume.trim()) return;
    setFacts(undefined);

    try {
      setProcessing(true);

      const response = await fetch(connectionBase + `/api/fact-check/${sessionId}`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/json',
        },
        body: JSON.stringify({ content: resume.trim() }),
      });

      // We'll guess that the response will be around 500 tokens...
      const token_guess = 500;
      const estimate = Math.round(token_guess / lastEvalTPS + contextStatus.context_used / lastPromptTPS);

      setSnack(`Resume sent for Fact Check. Response estimated in ${estimate}s.`, "info");
      //startCountdown(Math.round(estimate));

      if (!response.ok) {
        throw new Error(`Server responded with ${response.status}: ${response.statusText}`);
      }

      if (!response.body) {
        throw new Error('Response body is null');
      }

      // Set up stream processing with explicit chunking
      const reader = response.body.getReader();
      const decoder = new TextDecoder();
      let buffer = '';

      while (true) {
        const { done, value } = await reader.read();
        if (done) {
          break;
        }

        const chunk = decoder.decode(value, { stream: true });

        // Process each complete line immediately
        buffer += chunk;
        let lines = buffer.split('\n');
        buffer = lines.pop() || ''; // Keep incomplete line in buffer
        for (const line of lines) {
          if (!line.trim()) continue;

          try {
            const update = JSON.parse(line);

            // Force an immediate state update based on the message type
            if (update.status === 'processing') {
              // Add a small delay to ensure React has time to update the UI
              await new Promise(resolve => setTimeout(resolve, 0));

            } else if (update.status === 'done') {
              // Replace processing message with final result
              setFacts(update.message);
              const metadata = update.message.metadata;
              const evalTPS = metadata.eval_count * 10 ** 9 / metadata.eval_duration;
              const promptTPS = metadata.prompt_eval_count * 10 ** 9 / metadata.prompt_eval_duration;
              setLastEvalTPS(evalTPS ? evalTPS : 35);
              setLastPromptTPS(promptTPS ? promptTPS : 35);
              updateContextStatus();
            } else if (update.status === 'error') {
            }
          } catch (e) {
            setSnack("Error generating resume", "error")
            console.error('Error parsing JSON:', e, line);
          }
        }
      }

      // Process any remaining buffer content
      if (buffer.trim()) {
        try {
          const update = JSON.parse(buffer);

          if (update.status === 'done') {
            //setGenerateStatus(undefined);
            setFacts(update.message);
          }
        } catch (e) {
          setSnack("Error processing resume", "error")
        }
      }

      //stopCountdown();
      setProcessing(false);
    } catch (error) {
      console.error('Fetch error:', error);
      setSnack("Unable to process resume", "error");
      //setGenerateStatus({ role: 'error', content: `Error: ${error}` });
      setProcessing(false);
      //stopCountdown();
    }
  };

  return (
    <Box className="DocBox">
      <Box className="Conversation">
        <DocumentViewer sx={{
          display: "flex",
          flexGrow: 1,
          overflowY: "auto",
          flexDirection: "column",
          height: "calc(0vh - 0px)", // Hack to make the height work
        }} {...{ factCheck, facts, generateResume, resume }} />
      </Box>
    </Box>
  );
}


export type {
  ResumeBuilderProps
};

export {
  ResumeBuilder
};