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

export interface LogEntry {
  entry_id: string
  source_id: string
  sequence: number
  timestamp_iso: string | null
  severity: string | null
  repeat_count: number
  out_of_order: boolean
  matched_patterns: string[]
  text: string
  rank: number
}

export interface LogSource {
  source_id: string
  entry_count: number
  earliest: string | null
  latest: string | null
  error_count: number
}

const BASE = import.meta.env.BASE_URL.replace(/\/$/, '')

async function apiFetch<T>(path: string, params?: Record<string, string | undefined>): Promise<T> {
  const url = new URL(`${BASE}${path}`, window.location.origin)
  if (params) {
    for (const [k, v] of Object.entries(params)) {
      if (v !== undefined && v !== '') url.searchParams.set(k, v)
    }
  }
  const res = await fetch(url.toString())
  if (!res.ok) throw new Error(`API ${path} returned ${res.status}`)
  return res.json()
}

export const useSearchStore = defineStore('search', () => {
  const query = ref('')
  const sourceFilter = ref<string | undefined>()
  const severityFilter = ref<string | undefined>()
  const sinceFilter = ref<string | undefined>()
  const limit = ref(50)

  const results = ref<LogEntry[]>([])
  const loading = ref(false)
  const error = ref<string | null>(null)
  const total = ref(0)

  const sources = ref<LogSource[]>([])
  const sourcesLoaded = ref(false)

  const severityOptions = ['DEBUG', 'INFO', 'WARN', 'ERROR', 'CRITICAL']

  const hasResults = computed(() => results.value.length > 0)

  async function runSearch() {
    if (!query.value.trim()) return
    loading.value = true
    error.value = null
    try {
      const data = await apiFetch<{ count: number; results: LogEntry[] }>('/api/search', {
        q: query.value,
        source: sourceFilter.value,
        severity: severityFilter.value,
        since: sinceFilter.value,
        limit: String(limit.value),
      })
      results.value = data.results
      total.value = data.count
    } catch (e) {
      error.value = e instanceof Error ? e.message : String(e)
    } finally {
      loading.value = false
    }
  }

  async function loadSources() {
    if (sourcesLoaded.value) return
    try {
      const data = await apiFetch<{ sources: LogSource[] }>('/api/sources')
      sources.value = data.sources
      sourcesLoaded.value = true
    } catch {
      // non-fatal
    }
  }

  function clearFilters() {
    sourceFilter.value = undefined
    severityFilter.value = undefined
    sinceFilter.value = undefined
    limit.value = 50
  }

  return {
    query, sourceFilter, severityFilter, sinceFilter, limit,
    results, loading, error, total, sources, sourcesLoaded,
    severityOptions, hasResults,
    runSearch, loadSources, clearFilters,
  }
})