import { ref } from 'vue'
import { getApiBase } from '@/api/config'

export interface VLMTag {
  en: string
  local: string
}

export interface VLMScene {
  file_uuid: string
  file_name: string
  scene_index: number
  timestamp_sec: number
  frame_number: number
  thumbnail_url: string
  vlm_description: string
  vlm_description_localized?: string
  vlm_objects: string[]
  vlm_tags: VLMTag[]
  score: number
  source: string
}

export interface VLMTrace {
  file_uuid: string
  file_name: string
  trace_id: number
  start_frame: number
  end_frame: number
  start_time: number
  end_time: number
  timestamp_sec: number
  thumbnail_url: string
  vlm_description: string
  vlm_description_localized?: string
  vlm_objects: string[]
  vlm_tags: VLMTag[]
  score: number
  identity_name?: string
}

export interface FileScene {
  index: number
  filename: string
  timestamp_sec: number
  vlm_description: string
  vlm_description_localized?: string
  vlm_objects: string[]
  vlm_tags: VLMTag[]
  vlm_status: string
}

export function useVLMScenes(fileUuid: string) {
  const scenes = ref<FileScene[]>([])
  const loading = ref(false)
  const error = ref<string | null>(null)

  async function loadScenes() {
    loading.value = true
    error.value = null
    try {
      const base = getApiBase()
      const resp = await fetch(`${base}/api/v1/file/${fileUuid}/scenes`)
      if (!resp.ok) throw new Error(`HTTP ${resp.status}`)
      const data = await resp.json()
      scenes.value = Array.isArray(data) ? data : (data.scenes || [])
    } catch (e: any) {
      error.value = e.message || 'Failed to load scenes'
      scenes.value = []
    } finally {
      loading.value = false
    }
  }

  function getThumbnailUrl(sceneIndex: number): string {
    const base = getApiBase()
    const paddedIndex = String(sceneIndex).padStart(3, '0')
    return `${base}/api/v1/file/${fileUuid}/scenes/scene_${paddedIndex}.jpg`
  }

  return { scenes, loading, error, loadScenes, getThumbnailUrl }
}

export function useVLMSearch() {
  const scenes = ref<VLMScene[]>([])
  const traces = ref<VLMTrace[]>([])
  const loading = ref(false)
  const error = ref<string | null>(null)
  const total = ref(0)

  async function search(query: string, options?: {
    page_size?: number
    min_score?: number
    output_language?: string
    offset?: number
  }) {
    loading.value = true
    error.value = null
    const base = getApiBase()
    const params = {
      query,
      page_size: options?.page_size || 20,
      min_score: options?.min_score ?? 0.0,
      output_language: options?.output_language || 'en',
      ...(options?.offset != null ? { offset: options.offset } : {})
    }

    try {
      const [scenesRes, tracesRes] = await Promise.all([
        fetch(`${base}/api/v1/search/vlm/scenes`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(params)
        }).then(r => r.json()),
        fetch(`${base}/api/v1/search/vlm/traces`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(params)
        }).then(r => r.json())
      ])

      scenes.value = scenesRes?.results || []
      traces.value = tracesRes?.results || []
      total.value = scenesRes?.total || 0
    } catch (e: any) {
      error.value = e.message || 'Search failed'
      scenes.value = []
      traces.value = []
    } finally {
      loading.value = false
    }
  }

  function clearResults() {
    scenes.value = []
    traces.value = []
    total.value = 0
  }

  return { scenes, traces, loading, error, total, search, clearResults }
}

export function useSceneThumbnail(fileUuid: string, sceneIndex: number) {
  const url = ref<string | null>(null)
  const loading = ref(false)

  function loadThumbnail() {
    loading.value = true
    const base = getApiBase()
    const paddedIndex = String(sceneIndex).padStart(3, '0')
    url.value = `${base}/api/v1/file/${fileUuid}/scenes/scene_${paddedIndex}.jpg`
    loading.value = false
  }

  return { url, loading, loadThumbnail }
}