// One-time bootstrap of the active LLM settings from arcadia.
//
// On mount (and again whenever the session changes), if the operator has no
// active LLM settings in localStorage, fetch the tenant's enabled
// configurations and seed the active settings from the preferred row:
//
//   1. Any row with `metadata.default === true` (operator-marked default).
//   2. Otherwise the first enabled row.
//
// Once active settings exist, this component does nothing — the settings
// panel remains the place to switch between configs.

import { useEffect } from "react"
import { useArcadiaClient } from "@crema/arcadia-client"
import {
  loadSettings,
  saveSettings,
  type LLMProvidersSettings,
  type ProviderId,
} from "@crema/llm-providers-ui"

import {
  listConfigurations,
  saveActiveReasoning,
  type LlmConfiguration,
} from "~/lib/arcadia/llm-configs"

const ACTIVE_KEY = "crema.llm-providers.settings"

function hasActiveSettings(): boolean {
  if (typeof window === "undefined") return false
  return !!localStorage.getItem(ACTIVE_KEY)
}

function pickPreferred(configs: LlmConfiguration[]): LlmConfiguration | null {
  const enabled = configs.filter((c) => c.enabled)
  if (enabled.length === 0) return null
  const flagged = enabled.find(
    (c) => (c.metadata as { default?: boolean } | null)?.default === true,
  )
  return flagged ?? enabled[0]
}

function applyConfig(c: LlmConfiguration): void {
  const current = loadSettings()
  const next: LLMProvidersSettings = {
    ...current,
    providerId: c.provider as ProviderId,
    model: c.model,
    baseURL: c.base_url || undefined,
    secretName: c.secret_name || undefined,
  }
  saveSettings(next)
  saveActiveReasoning(c.reasoning_effort ?? "off")
}

export function LlmConfigBootstrap() {
  const arcadia = useArcadiaClient()

  useEffect(() => {
    let cancelled = false

    const tryBootstrap = async () => {
      if (hasActiveSettings()) return
      const token =
        typeof window !== "undefined"
          ? sessionStorage.getItem("arcadia_access_token")
          : null
      if (!token) return
      try {
        const configs = await listConfigurations(arcadia, { enabled: true })
        if (cancelled) return
        const pick = pickPreferred(configs)
        if (pick && !hasActiveSettings()) applyConfig(pick)
      } catch {
        // 401 / network — silently skip; will retry on next session change.
      }
    }

    void tryBootstrap()

    const onSessionChange = () => void tryBootstrap()
    window.addEventListener("crema:session-change", onSessionChange)
    return () => {
      cancelled = true
      window.removeEventListener("crema:session-change", onSessionChange)
    }
  }, [arcadia])

  return null
}