/** Pinia store — chat messages + streaming state with per-section tracking. */

import { defineStore } from 'pinia'
import { ref, computed } from 'vue'

export interface Message {
  id: string
  role: 'user' | 'assistant'
  content: string
  type?: 'text' | 'jrxml' | 'error' | 'success' | 'consult'
  timestamp: string
}

export interface NodeProgress {
  node: string
  label: string
  detail?: string
  status: 'running' | 'done'
}

export interface ProcessSection {
  node: string
  label: string
  stepIndex: number
  detail: string
  content: string
  status: 'running' | 'done'
  expanded: boolean
  durationMs: number
  startTime: number
}

export interface AgentSummary {
  intent: string
  status: string
  jrxml_length: number
  error_msg: string
  natural_explanation: string
  retry_count: number
}

export interface UploadedFile {
  file_id: string
  filename: string
  content_type: string
  size: number
  preview?: string
}

export const useChatStore = defineStore('chat', () => {
  const messages = ref<Message[]>([])
  const streaming = ref(false)
  const lastDurationMs = ref(0)
  const streamText = ref('')
  const nodes = ref<NodeProgress[]>([])
  const sections = ref<ProcessSection[]>([])
  const error = ref<string>('')
  const ocrResult = ref<any>(null)
  const uploadedFiles = ref<UploadedFile[]>([])
  const summary = ref<AgentSummary>({
    intent: '', status: '', jrxml_length: 0,
    error_msg: '', natural_explanation: '', retry_count: 0,
  })

  const totalDurationMs = computed(() => {
    if (sections.value.length === 0) return 0
    const last = sections.value[sections.value.length - 1]
    return last.status === 'done'
      ? last.startTime + last.durationMs - sections.value[0].startTime
      : Date.now() - sections.value[0].startTime
  })

  function formatDuration(ms: number): string {
    if (ms < 1000) return `${ms}ms`
    if (ms < 60000) return `${(ms / 1000).toFixed(1)}s`
    const m = Math.floor(ms / 60000)
    const s = Math.round((ms % 60000) / 1000)
    return `${m}m${s}s`
  }

  function addMessage(msg: Omit<Message, 'id' | 'timestamp'>) {
    messages.value.push({
      ...msg,
      id: crypto.randomUUID(),
      timestamp: new Date().toISOString(),
    })
  }

  function startStreaming() {
    streaming.value = true
    lastDurationMs.value = 0
    streamText.value = ''
    nodes.value = []
    sections.value = []
    error.value = ''
    summary.value = {
      intent: '', status: '', jrxml_length: 0,
      error_msg: '', natural_explanation: '', retry_count: 0,
    }
  }

  function appendStreamToken(text: string) {
    streamText.value += text
    const active = sections.value.find(s => s.status === 'running')
    if (active) {
      active.content += text
    }
  }

  function addNode(node: { node: string; label: string; step_index?: number }) {
    nodes.value.push({ node: node.node, label: node.label, status: 'running' })
    const prev = sections.value.find(s => s.status === 'running')
    if (prev) {
      prev.status = 'done'
      prev.durationMs = Date.now() - prev.startTime
      prev.expanded = false
    }
    sections.value.push({
      node: node.node,
      label: node.label,
      stepIndex: node.step_index || sections.value.length + 1,
      detail: '',
      content: '',
      status: 'running',
      expanded: true,
      durationMs: 0,
      startTime: Date.now(),
    })
  }

  function completeNode(node: { node: string; label: string; detail: string }) {
    const existing = nodes.value.find(n => n.node === node.node)
    if (existing) {
      existing.status = 'done'
      existing.detail = node.detail
    }
    const sec = sections.value.find(s => s.node === node.node && s.status === 'running')
    if (sec) {
      sec.detail = node.detail
      sec.status = 'done'
      sec.durationMs = Date.now() - sec.startTime
    }
  }

  function finishStreaming(data?: {
    intent?: string; status?: string; jrxml_length?: number
    error_msg?: string; natural_explanation?: string; consult_answer?: string; retry_count?: number
    total_duration_ms?: number; ocr_extraction_result?: any
  }) {
    streaming.value = false
    nodes.value.forEach(n => { n.status = 'done' })
    sections.value.forEach(s => {
      if (s.status === 'running') {
        s.status = 'done'
        s.durationMs = Date.now() - s.startTime
      }
      s.expanded = false
    })
    if (data) {
      lastDurationMs.value = data.total_duration_ms || 0
      summary.value = {
        intent: data.intent || '',
        status: data.status || '',
        jrxml_length: data.jrxml_length || 0,
        error_msg: data.error_msg || '',
        natural_explanation: data.natural_explanation || '',
        consult_answer: data.consult_answer || '',
        retry_count: data.retry_count || 0,
      }
      if (data.ocr_extraction_result) {
        ocrResult.value = data.ocr_extraction_result
      }
    }
  }

  function setError(err: string) {
    error.value = err
    streaming.value = false
    sections.value.forEach(s => { s.status = 'done'; s.expanded = false })
  }

  function toggleSection(node: string) {
    const sec = sections.value.find(s => s.node === node)
    if (sec) {
      sec.expanded = !sec.expanded
    }
  }

  function addUploadedFile(file: UploadedFile) {
    uploadedFiles.value.push(file)
  }

  function removeUploadedFile(fileId: string) {
    uploadedFiles.value = uploadedFiles.value.filter(f => f.file_id !== fileId)
  }

  function reset() {
    messages.value = []
    streamText.value = ''
    nodes.value = []
    sections.value = []
    error.value = ''
    streaming.value = false
    ocrResult.value = null
    uploadedFiles.value = []
    summary.value = {
      intent: '', status: '', jrxml_length: 0,
      error_msg: '', natural_explanation: '', retry_count: 0,
    }
  }

  return {
    messages, streaming, lastDurationMs, streamText, nodes, sections, error, ocrResult,
    uploadedFiles, summary, totalDurationMs,
    addMessage, startStreaming, appendStreamToken, addNode, completeNode,
    finishStreaming, setError, toggleSection, reset, formatDuration,
    addUploadedFile, removeUploadedFile,
  }
})