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import React, { useState, useEffect, useRef } from "react";
import { Box, Typography, CircularProgress, Alert, Paper } from "@mui/material";
import PlayArrowIcon from "@mui/icons-material/PlayArrow";
import AccessTimeIcon from "@mui/icons-material/AccessTime";
import LogDisplay from "./LogDisplay";

// Define all benchmark steps in sequence
const BENCHMARK_STEPS = [
  "ingestion",
  "upload_ingest_to_hub",
  "summarization",
  "chunking",
  "single_shot_question_generation",
  "multi_hop_question_generation",
  "lighteval",
];

// Step labels for display (more user-friendly names)
const STEP_LABELS = {
  ingestion: "Ingestion",
  upload_ingest_to_hub: "Upload to Hub",
  summarization: "Summarization",
  chunking: "Chunking",
  single_shot_question_generation: "Single-shot QG",
  multi_hop_question_generation: "Multi-hop QG",
  lighteval: "LightEval",
};

/**
 * Component to handle benchmark generation and display logs
 *
 * @param {Object} props - Component props
 * @param {string} props.sessionId - The session ID for the uploaded file
 * @param {Function} props.onComplete - Function to call when generation is complete
 * @returns {JSX.Element} Benchmark generator component
 */
const BenchmarkGenerator = ({ sessionId, onComplete }) => {
  const [generating, setGenerating] = useState(false);
  const [generationComplete, setGenerationComplete] = useState(false);
  const [generationLogs, setGenerationLogs] = useState([]);
  const [error, setError] = useState(null);
  const [currentPhase, setCurrentPhase] = useState("initializing");
  const [completedSteps, setCompletedSteps] = useState([]);
  const [activeStep, setActiveStep] = useState(0);
  const [elapsedTime, setElapsedTime] = useState(0);

  // Reference to keep track of the polling interval
  const pollingIntervalRef = useRef(null);

  // Reference to keep track of the timer interval
  const timerIntervalRef = useRef(null);

  // Reference for starting time
  const startTimeRef = useRef(null);

  // Start generation on component mount
  useEffect(() => {
    // Set start time
    startTimeRef.current = Date.now();

    // Start timer
    timerIntervalRef.current = setInterval(() => {
      const timeElapsed = Math.floor(
        (Date.now() - startTimeRef.current) / 1000
      );
      setElapsedTime(timeElapsed);
    }, 1000);

    generateBenchmark();

    // Clean up the polling interval and timer when the component unmounts
    return () => {
      if (pollingIntervalRef.current) {
        clearInterval(pollingIntervalRef.current);
      }
      if (timerIntervalRef.current) {
        clearInterval(timerIntervalRef.current);
      }
    };
  }, []);

  // Determine the current phase and completed steps based on logs
  useEffect(() => {
    if (generationLogs.length === 0) return;

    // Check all logs for completed stages
    const newCompletedSteps = [...completedSteps];
    let newActiveStep = activeStep;

    generationLogs.forEach((log) => {
      const match = log.match(/\[SUCCESS\] Stage completed: (\w+)/);
      if (match && match[1]) {
        const completedStep = match[1].trim();
        if (
          BENCHMARK_STEPS.includes(completedStep) &&
          !newCompletedSteps.includes(completedStep)
        ) {
          newCompletedSteps.push(completedStep);
          // Set active step to the index of the next step
          const stepIndex = BENCHMARK_STEPS.indexOf(completedStep);
          if (stepIndex >= 0 && stepIndex + 1 > newActiveStep) {
            newActiveStep = stepIndex + 1;
            if (newActiveStep >= BENCHMARK_STEPS.length) {
              newActiveStep = BENCHMARK_STEPS.length;
            }
          }
        }
      }
    });

    // Update state if there are new completed steps
    if (newCompletedSteps.length > completedSteps.length) {
      setCompletedSteps(newCompletedSteps);
      setActiveStep(newActiveStep);
    }

    // Check the latest logs to determine the current phase
    const recentLogs = generationLogs.slice(-10); // Check more logs

    // Detect completion conditions
    const isComplete =
      recentLogs.some((log) =>
        log.includes("[SUCCESS] Ingestion process completed successfully")
      ) ||
      recentLogs.some((log) =>
        log.includes(
          "[SUCCESS] Configuration and ingestion completed successfully"
        )
      ) ||
      completedSteps.includes("lighteval") ||
      newCompletedSteps.includes("lighteval");

    if (isComplete) {
      setCurrentPhase("complete");
      setGenerationComplete(true);
      // Stop polling when benchmark is complete
      if (pollingIntervalRef.current) {
        clearInterval(pollingIntervalRef.current);
      }
      // Notify parent component that generation is complete
      if (onComplete) {
        console.log("Notifying parent that generation is complete");
        onComplete({
          success: true,
          sessionId,
          logs: generationLogs,
        });
      }
    } else if (
      recentLogs.some((log) => log.includes("starting benchmark creation"))
    ) {
      setCurrentPhase("benchmarking");
    } else if (
      recentLogs.some((log) => log.includes("Generating base configuration"))
    ) {
      setCurrentPhase("configuring");
    }
  }, [generationLogs, completedSteps, activeStep, sessionId, onComplete]);

  const generateBenchmark = async () => {
    if (!sessionId) {
      setError("Missing session ID");
      return;
    }

    setGenerating(true);
    setGenerationLogs([]);
    setError(null);
    setCurrentPhase("initializing");
    setCompletedSteps([]);
    setActiveStep(0);

    try {
      // Call the API to generate the benchmark
      const response = await fetch("http://localhost:3001/generate-benchmark", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          session_id: sessionId,
        }),
      });

      const result = await response.json();

      if (response.ok) {
        setGenerationLogs(result.logs || []);

        // D'abord, on commence par interroger les logs de configuration
        const pollConfigLogs = async () => {
          try {
            // Call the API to get the config logs
            const configLogsResponse = await fetch(
              `http://localhost:3001/config-logs/${sessionId}`
            );

            if (configLogsResponse.ok) {
              const configLogsResult = await configLogsResponse.json();

              // Update logs if there are new ones
              if (
                configLogsResult.logs &&
                configLogsResult.logs.length > generationLogs.length
              ) {
                setGenerationLogs(configLogsResult.logs);
              }

              // If config task is completed, switch to polling benchmark logs
              if (configLogsResult.is_completed) {
                // Attendre un court instant pour permettre au serveur de démarrer le benchmark
                setTimeout(() => {
                  console.log(
                    "Configuration completed, switching to benchmark polling"
                  );
                  clearInterval(configPollingIntervalRef.current);
                  pollBenchmarkLogs();
                }, 1000);
              }
            }
          } catch (error) {
            console.log("Error polling for config logs:", error);
            // Don't stop polling on network errors
          }
        };

        // Fonction pour interroger les logs du benchmark
        const pollBenchmarkLogs = async () => {
          // Set up polling for benchmark logs
          pollingIntervalRef.current = setInterval(async () => {
            // Check if we already completed
            if (generationComplete) {
              clearInterval(pollingIntervalRef.current);
              return;
            }

            try {
              // Call the API to get the latest benchmark logs
              const logsResponse = await fetch(
                `http://localhost:3001/benchmark-logs/${sessionId}`
              );

              if (logsResponse.ok) {
                const logsResult = await logsResponse.json();

                // Update logs if there are new ones
                if (
                  logsResult.logs &&
                  logsResult.logs.length > generationLogs.length
                ) {
                  setGenerationLogs(logsResult.logs);
                }

                // Check if the task is completed
                if (logsResult.is_completed) {
                  setGenerationComplete(true);
                  clearInterval(pollingIntervalRef.current);
                  // Notification is now handled in the useEffect above
                }
              }
            } catch (error) {
              console.log("Error polling for benchmark logs:", error);
              // Don't stop polling on network errors
            }
          }, 3000); // Poll every 3 seconds
        };

        // Démarrer le polling des logs de configuration
        const configPollingIntervalRef = { current: null };
        configPollingIntervalRef.current = setInterval(pollConfigLogs, 1000); // Poll config logs more frequently (every second)
      } else {
        // Handle error
        setGenerationLogs([`Error: ${result.error || "Unknown error"}`]);
        setError(result.error || "Benchmark generation failed");
      }
    } catch (error) {
      console.error("Error generating benchmark:", error);
      setGenerationLogs([`Error: ${error.message || "Unknown error"}`]);
      setError("Server connection error");
    } finally {
      setGenerating(false);
    }
  };

  // Get title based on current phase
  const getPhaseTitle = () => {
    switch (currentPhase) {
      case "initializing":
        return "Benchmark generation...";
      case "configuring":
        return "Generating configuration file...";
      case "benchmarking":
        return "Creating benchmark...";
      case "complete":
        return "Benchmark generated successfully!";
      default:
        return "Processing...";
    }
  };

  // Get the current step information for display
  const getCurrentStepInfo = () => {
    const totalSteps = BENCHMARK_STEPS.length;
    const currentStepIndex = activeStep;

    // If there's no active step yet
    if (currentStepIndex === 0 && completedSteps.length === 0) {
      return `Starting... (0%)`;
    }

    // If all steps are completed
    if (currentStepIndex >= totalSteps) {
      return `Complete (100%)`;
    }

    // Calculate percentage
    const percentage = Math.round((currentStepIndex / totalSteps) * 100);

    // Get current step name
    const currentStepName =
      STEP_LABELS[BENCHMARK_STEPS[currentStepIndex]] || "Processing";

    return `${currentStepName} (${percentage}%)`;
  };

  // Format elapsed time in HH:MM:SS
  const formatElapsedTime = () => {
    const hours = Math.floor(elapsedTime / 3600);
    const minutes = Math.floor((elapsedTime % 3600) / 60);
    const seconds = elapsedTime % 60;

    return [
      hours.toString().padStart(2, "0"),
      minutes.toString().padStart(2, "0"),
      seconds.toString().padStart(2, "0"),
    ].join(":");
  };

  // If complete, stop the timer
  useEffect(() => {
    if (generationComplete && timerIntervalRef.current) {
      clearInterval(timerIntervalRef.current);
    }
  }, [generationComplete]);

  return (
    <Paper
      elevation={3}
      sx={{
        p: 4,
        mt: 3,
        mb: 3,
        display: "flex",
        flexDirection: "column",
        alignItems: "center",
        justifyContent: "center",
        minHeight: 200,
      }}
    >
      {error ? (
        <Alert severity="error" sx={{ width: "100%" }}>
          {error}
        </Alert>
      ) : (
        <>
          <CircularProgress size={60} sx={{ mb: 2 }} />
          <Typography variant="h6" component="div" gutterBottom>
            {getPhaseTitle()}
          </Typography>

          {/* Step progress indicator */}
          <Typography variant="body1" color="text.secondary">
            {getCurrentStepInfo()}
          </Typography>

          {/* Timer display */}
          <Box
            sx={{
              display: "flex",
              alignItems: "center",
              mt: 1,
              color: "text.secondary",
            }}
          >
            <Typography variant="body2" sx={{ opacity: 0.5 }}>
              {formatElapsedTime()}
            </Typography>
          </Box>
        </>
      )}

      {/* Use the LogDisplay component */}
      <LogDisplay logs={generationLogs} height={300} />
    </Paper>
  );
};

export default BenchmarkGenerator;