import React, { useState, useEffect } from 'react'
import { Text, Box, Spacer } from 'ink'
import { Spinner } from '@inkjs/ui'
import TextInput from 'ink-text-input'
import CompositeInput from './components/CompositeInput.jsx'
import SimpleConfirm from './components/SimpleConfirm.jsx'
import EmojiSpinner from './components/EmojiSpinner.jsx'
import fs from 'fs/promises'
import path from 'path'
import { fileURLToPath } from 'url'
import { dirname } from 'path'

const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)

/**
 * Init Page - Marketing Questionnaire
 */
const InitPage = ({ onBack }) => {
  const [questions, setQuestions] = useState(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState(null)
  const [currentQuestionIndex, setCurrentQuestionIndex] = useState(0)
  const [answers, setAnswers] = useState([])
  const [showConfirmSubmit, setShowConfirmSubmit] = useState(false)
  const [showModifyInput, setShowModifyInput] = useState(false)
  const [modifyInputValue, setModifyInputValue] = useState('')
  const [editingQuestionIndex, setEditingQuestionIndex] = useState(-1)
  const [isProcessing, setIsProcessing] = useState(false)

  // Load questions on mount
  useEffect(() => {
    const loadQuestions = async () => {
      try {
        // Try different paths based on environment
        const possiblePaths = [
          path.join(__dirname, '..', 'src', 'init', 'generated', 'questions.json'), // From dist to src/init
          path.join(path.dirname(__dirname), 'src', 'init', 'generated', 'questions.json'), // Alternative dist path
          path.resolve('./src/init/generated/questions.json'), // Absolute from project root
          '/Users/leo/Documents/GitHub/rina/src/init/generated/questions.json', // Fallback absolute path
        ]

        let data = null
        for (const jsonPath of possiblePaths) {
          try {
            data = await fs.readFile(jsonPath, 'utf-8')
            break
          } catch (err) {
            // Try next path - uncomment for debugging
            // console.log(`Failed to load from: ${jsonPath}`, err.message)
          }
        }

        if (!data) {
          throw new Error('Questions file not found in any expected location')
        }

        const parsed = JSON.parse(data)
        setQuestions(parsed)
        setLoading(false)
      } catch (err) {
        setError(`Failed to load questions: ${err.message}`)
        setLoading(false)
      }
    }

    loadQuestions()
  }, [])

  const handlePrevious = () => {
    // Go to previous question if not at the first question
    if (currentQuestionIndex > 0) {
      setCurrentQuestionIndex(prev => prev - 1)
      setEditingQuestionIndex(-1) // Clear editing state
    }
  }

  const handleCompositeSubmit = answer => {
    // Handle shortcuts like /1, /2, etc.
    if (answer.startsWith('/')) {
      const questionNum = parseInt(answer.substring(1))
      if (questionNum >= 1 && questionNum <= questions.totalQuestions) {
        // Jump to specific question (convert to 0-based index)
        setCurrentQuestionIndex(questionNum - 1)
        setEditingQuestionIndex(questionNum - 1)
        return
      }
    }

    // Start loading animation
    setIsProcessing(true)

    // Store answer - update existing answer if re-answering
    const wasReAnswering = answers.some(
      ans => ans.question === questions.questions[currentQuestionIndex].question
    )

    // Simulate processing delay
    setTimeout(() => {
      setAnswers(prev => {
        const newAnswers = [...prev]
        const existingIndex = newAnswers.findIndex(
          ans => ans.question === questions.questions[currentQuestionIndex].question
        )

        if (existingIndex >= 0) {
          // Update existing answer
          newAnswers[existingIndex] = {
            question: questions.questions[currentQuestionIndex].question,
            answer: answer,
          }
        } else {
          // Add new answer
          newAnswers.push({
            question: questions.questions[currentQuestionIndex].question,
            answer: answer,
          })
        }
        return newAnswers
      })

      // Clear editing state
      setEditingQuestionIndex(-1)

      // Stop loading animation
      setIsProcessing(false)

      // If user was re-answering a question, find next unanswered question
      if (wasReAnswering) {
        // Find the first unanswered question
        const answeredQuestions = new Set(answers.map(ans => ans.question))
        // Add current question to the set since we just answered it
        answeredQuestions.add(questions.questions[currentQuestionIndex].question)

        for (let i = 0; i < questions.questions.length; i++) {
          if (!answeredQuestions.has(questions.questions[i].question)) {
            setCurrentQuestionIndex(i)
            return
          }
        }
        // All questions answered - show confirmation
        setShowConfirmSubmit(true)
      } else {
        // Normal flow: move to next question or finish
        if (currentQuestionIndex < questions.questions.length - 1) {
          setCurrentQuestionIndex(prev => prev + 1)
        } else {
          // All questions answered - show confirmation
          setShowConfirmSubmit(true)
        }
      }
    }, 2000) // 2 second delay
  }

  const handleConfirmSubmit = confirmed => {
    if (confirmed) {
      // User confirmed - return to main menu
      if (onBack) onBack()
    } else {
      // User wants to modify - show modify input
      setShowConfirmSubmit(false)
      setShowModifyInput(true)
      setModifyInputValue('')
    }
  }

  const handleModifyInput = value => {
    if (value.trim()) {
      // Handle shortcuts like /1, /2, etc. for modification
      if (value.startsWith('/')) {
        const questionNum = parseInt(value.substring(1))
        if (questionNum >= 1 && questionNum <= questions.totalQuestions) {
          // Jump to specific question for modification
          setCurrentQuestionIndex(questionNum - 1)
          setEditingQuestionIndex(questionNum - 1)
          setShowModifyInput(false)
          return
        }
      }

      // If not a valid shortcut, try to parse as question number
      const questionNum = parseInt(value)
      if (questionNum >= 1 && questionNum <= questions.totalQuestions) {
        // Jump to specific question for modification
        setCurrentQuestionIndex(questionNum - 1)
        setEditingQuestionIndex(questionNum - 1)
        setShowModifyInput(false)
      }
    }
  }

  if (loading) {
    return (
      <Box padding={1}>
        <Text color='yellow'>Loading questions...</Text>
      </Box>
    )
  }

  if (error) {
    return (
      <Box padding={1}>
        <Text color='red'>{error}</Text>
      </Box>
    )
  }

  // Show confirmation dialog
  if (showConfirmSubmit) {
    return (
      <Box flexDirection='column' padding={1}>
        <Box marginBottom={2}>
          <Text color='green' bold>
            🎉 All questions completed!
          </Text>
        </Box>

        <Box
          paddingX={2}
          paddingY={1}
          borderColor='white'
          borderStyle='round'
          marginBottom={2}
          flexDirection='column'
        >
          <Text color='yellow'>Your answers:</Text>
          {answers.map((ans, idx) => {
            const questionIndex = questions.questions.findIndex(q => q.question === ans.question)
            const isEditing = editingQuestionIndex === questionIndex
            return (
              <Box key={idx} marginTop={1} flexDirection='column'>
                <Text color='white'>
                  Q{idx + 1}: {ans.question}
                </Text>
                <Text color='gray'>
                  A{idx + 1}: {isEditing ? '[editing]' : ans.answer}
                </Text>
              </Box>
            )
          })}
        </Box>

        {/* Loading indicator for submission */}
        {isProcessing && (
          <Box marginBottom={1}>
            <EmojiSpinner label='Aura is thinking...' />
          </Box>
        )}

        {/* Question for submission */}
        <Box columnGap={1} marginBottom={2}>
          <Text>🌀</Text>
          <Text bold>Ready to submit?</Text>
        </Box>

        <CompositeInput
          options={[
            { label: 'Yes,submit for deep analysis', value: 'submit' },
            { label: 'No, modify answers...', value: 'modify' },
          ]}
          onSubmit={value => {
            setIsProcessing(true)
            setTimeout(() => {
              if (value === 'submit') {
                handleConfirmSubmit(true)
              } else if (value === 'modify') {
                // 直接進入修改模式
                setShowConfirmSubmit(false)
                setShowModifyInput(true)
                setModifyInputValue('')
              }
              setIsProcessing(false)
            }, 2000)
          }}
          onBack={onBack}
          isReview={true}
          showTypeYourAnswer={false}
          directSubmitValues={['submit', 'modify']}
        />
      </Box>
    )
  }

  // Show modify input
  if (showModifyInput) {
    return (
      <Box flexDirection='column' padding={1}>
        {/* Show previous answers */}
        {answers.length > 0 && (
          <Box marginBottom={2} flexDirection='column'>
            <Text color='yellow' bold>
              Your answers:
            </Text>
            {answers.map((ans, idx) => {
              const questionIndex = questions.questions.findIndex(q => q.question === ans.question)
              const isEditing = editingQuestionIndex === questionIndex
              return (
                <Box key={idx} marginTop={1} flexDirection='column'>
                  <Text color='white'>
                    Q{idx + 1}: {ans.question}
                  </Text>
                  <Text color='gray'>
                    A{idx + 1}: {isEditing ? '[editing]' : ans.answer}
                  </Text>
                </Box>
              )
            })}
          </Box>
        )}

        {/* Question for modification */}
        <Box columnGap={1} marginBottom={2}>
          <Text>🌀</Text>
          <Text bold>Which question do you want to modify?</Text>
        </Box>

        <CompositeInput
          options={[]}
          onSubmit={handleModifyInput}
          placeholder='/1, /2, etc. to jump to specific questions'
          initialValue={modifyInputValue}
          onBack={onBack}
          isReview={true}
          showTypeYourAnswer={false}
        />
      </Box>
    )
  }

  // Show composite input mode
  if (questions && questions.questions[currentQuestionIndex]) {
    const currentQuestion = questions.questions[currentQuestionIndex]
    return (
      <Box flexDirection='column' padding={1}>
        <Box marginBottom={1} flexDirection='row'>
          <Box>
            <Text bold>
              📝 Question {currentQuestionIndex + 1} of {questions.totalQuestions}
            </Text>
          </Box>
          <Spacer />

          {/* Progress Bar */}
          <Box>
            <Box marginBottom={1} marginRight={2}>
              {(() => {
                const isExact = true
                if (isExact) {
                  const completed = currentQuestionIndex + 1
                  const remaining = questions.totalQuestions - completed
                  return (
                    <Text>
                      <Text color='white'>{'🐤'.repeat(completed)}</Text>
                      <Text color='white'>{'🥚'.repeat(remaining)}</Text>
                    </Text>
                  )
                } else {
                  const progress = (currentQuestionIndex + 1) / questions.totalQuestions
                  const width = 30
                  const filled = Math.round(progress * width)
                  const empty = width - filled
                  return (
                    <Text>
                      <Text color='white'>{'🐤'.repeat(filled)}</Text>
                      <Text color='white'>{'🥚'.repeat(empty)}</Text>
                    </Text>
                  )
                }
              })()}
            </Box>
          </Box>
        </Box>
        {/* Show previous answers only when all questions are completed */}
        {answers.length > 0 && answers.length === questions.totalQuestions && (
          <Box marginBottom={2} flexDirection='column' width={'100%'}>
            {answers.map((ans, idx) => {
              const questionIndex = questions.questions.findIndex(q => q.question === ans.question)
              const isEditing = editingQuestionIndex === questionIndex
              return (
                <Box key={idx} marginTop={1} flexDirection='column'>
                  <Text color='white'>
                    Q{idx + 1}: {ans.question}
                  </Text>
                  <Text color='gray'>
                    A{idx + 1}: {isEditing ? '[editing]' : ans.answer}
                  </Text>
                </Box>
              )
            })}
          </Box>
        )}

        {/* Question display */}
        <Box columnGap={1} marginBottom={2}>
          <Text>🌀</Text>
          <Box flexDirection='column' rowGap={1}>
            <Text bold>{currentQuestion.question}</Text>
            {currentQuestion.explainer && (
              <Text marginLeft={2} dimColor fontSize={12}>
                {currentQuestion.explainer}
              </Text>
            )}
          </Box>
        </Box>

        {/* Loading indicator */}
        {isProcessing && (
          <Box marginBottom={1}>
            <EmojiSpinner label='Processing your answer...' />
          </Box>
        )}

        <CompositeInput
          options={currentQuestion.options || []}
          onSubmit={handleCompositeSubmit}
          placeholder='Type your answer...'
          initialValue={
            editingQuestionIndex === currentQuestionIndex
              ? answers.find(ans => ans.question === currentQuestion.question)?.answer || ''
              : ''
          }
          onBack={onBack}
          onPrevious={handlePrevious}
          isReview={answers.length === questions.totalQuestions}
        />
      </Box>
    )
  }

  return (
    <Box padding={1}>
      <Text color='red'>No questions available</Text>
    </Box>
  )
}

export default InitPage