// Bootnode authentication.
//   Local development: the built-in email/password form.
//   Every deployed host: that host's own IAM, via PKCE (see lib/iam.ts).
// Which issuer that is, is decided by the hostname — see lib/brand.ts.

"use client"

import { createContext, useContext, useEffect, useState } from "react"
import { useRouter } from "next/navigation"
import { toast } from "sonner"
import { getApiUrl } from "@/lib/api"
import { ErrorState, Loading } from "@/components/ui/states"

interface BootnodeUser {
  id: string
  name: string
  email: string
  org: "hanzo" | "zoo" | "lux" | "pars" | "local"
  avatar?: string
  roles: string[]
  permissions: string[]
  createdAt?: string
}

interface AuthContextType {
  user: BootnodeUser | null
  isLoading: boolean
  isProduction: boolean
  login: (email: string, password: string) => Promise<void>
  loginWithToken: (token: string) => Promise<void>
  register: (email: string, password: string, name: string) => Promise<void>
  logout: () => void
  hasRole: (role: string) => boolean
  hasPermission: (permission: string) => boolean
  isAdmin: boolean
}

const AuthContext = createContext<AuthContextType | undefined>(undefined)

// Any host that is not a developer's own machine authenticates through IAM.
//
// This used to be forceable with NEXT_PUBLIC_AUTH_MODE=iam. That was a
// build-time constant baked into one image that serves every white-label host
// — the same defect as NEXT_PUBLIC_BRAND — and it was redundant besides: the
// hostname test below already answers correctly for every deployed host.
const isProductionMode = () => {
  if (typeof window === "undefined") return false
  const h = window.location.hostname
  return h !== "localhost" && h !== "127.0.0.1" && h !== "0.0.0.0" && !h.startsWith("192.168.") && !h.startsWith("10.")
}

export function useAuth() {
  const context = useContext(AuthContext)
  if (context === undefined) {
    throw new Error("useAuth must be used within an AuthProvider")
  }
  return context
}

interface AuthProviderProps {
  children: React.ReactNode
}

export function AuthProvider({ children }: AuthProviderProps) {
  const [user, setUser] = useState<BootnodeUser | null>(null)
  const [isLoading, setIsLoading] = useState(true)
  const isProduction = isProductionMode()

  // The API origin comes from lib/api's getApiUrl() — the ONE resolver, which
  // already returns the localStorage override when set and the brand's origin
  // otherwise.
  //
  // A local copy of that logic used to live here, and it was infinitely
  // recursive: `const getApiUrl = useCallback(...)` shadowed the import at the
  // top of this file, and its own last line called `getApiUrl()`. On any host
  // it classified as local — localhost, 127.0.0.1, 192.168.*, 10.* — every
  // checkAuth / login / register overflowed the stack. That is the whole of
  // local development, and it is what two copies of one function buys you.

  useEffect(() => {
    checkAuth()
  }, [])

  async function checkAuth() {
    try {
      const token = localStorage.getItem("bootnode_token")
      if (!token) {
        setIsLoading(false)
        return
      }

      const apiUrl = getApiUrl()
      const response = await fetch(`${apiUrl}/v1/auth/me`, {
        headers: {
          Authorization: `Bearer ${token}`,
        },
      })

      if (response.ok) {
        const userData = await response.json()
        setUser(userData)
      } else {
        // Token is invalid or expired
        localStorage.removeItem("bootnode_token")
      }
    } catch (error) {
      console.error("Auth check failed:", error)
      localStorage.removeItem("bootnode_token")
    } finally {
      setIsLoading(false)
    }
  }

  async function login(email: string, password: string) {
    try {
      const apiUrl = getApiUrl()
      const response = await fetch(`${apiUrl}/v1/auth/login`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({ email, password }),
      })

      if (!response.ok) {
        const error = await response.json().catch(() => ({ detail: "Login failed" }))
        throw new Error(error.detail || "Login failed")
      }

      const { access_token, user: userData } = await response.json()
      localStorage.setItem("bootnode_token", access_token)
      setUser(userData)
      toast.success("Successfully logged in!")
    } catch (error) {
      console.error("Login failed:", error)
      throw error
    }
  }

  async function loginWithToken(token: string) {
    try {
      localStorage.setItem("bootnode_token", token)
      await checkAuth()
      toast.success("Successfully logged in!")
    } catch (error) {
      console.error("Token login failed:", error)
      localStorage.removeItem("bootnode_token")
      throw error
    }
  }

  async function register(email: string, password: string, name: string) {
    try {
      const apiUrl = getApiUrl()
      const response = await fetch(`${apiUrl}/v1/auth/register`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({ email, password, name }),
      })

      if (!response.ok) {
        const error = await response.json().catch(() => ({ detail: "Registration failed" }))
        throw new Error(error.detail || "Registration failed")
      }

      const { access_token, user: userData } = await response.json()
      localStorage.setItem("bootnode_token", access_token)
      setUser(userData)
      toast.success("Account created successfully!")
    } catch (error) {
      console.error("Registration failed:", error)
      throw error
    }
  }

  function logout() {
    localStorage.removeItem("bootnode_token")
    localStorage.removeItem("bootnode_project_id")
    setUser(null)
    toast.success("Successfully logged out!")
  }

  function hasRole(role: string): boolean {
    return user?.roles.includes(role) ?? false
  }

  function hasPermission(permission: string): boolean {
    return user?.permissions.includes(permission) ?? false
  }

  const isAdmin = user?.roles.includes("admin") ?? false

  const value = {
    user,
    isLoading,
    isProduction,
    login,
    loginWithToken,
    register,
    logout,
    hasRole,
    hasPermission,
    isAdmin,
  }

  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>
}

// Organization Badge Component
export function OrgBadge({ org }: { org: string }) {
  const orgConfig = {
    hanzo: { name: "Hanzo", color: "bg-blue-500" },
    zoo: { name: "Zoo Labs", color: "bg-green-500" },
    lux: { name: "Lux Network", color: "bg-purple-500" },
    pars: { name: "Pars", color: "bg-orange-500" },
    local: { name: "Local", color: "bg-gray-500" },
  }

  const config = orgConfig[org as keyof typeof orgConfig] || orgConfig.local

  return (
    <span className={`inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-medium text-white ${config.color}`}>
      {config.name}
    </span>
  )
}

// Protected Route Component
export function ProtectedRoute({
  children,
  requiredRole,
  requiredPermission
}: {
  children: React.ReactNode
  requiredRole?: string
  requiredPermission?: string
}) {
  const { user, isLoading, hasRole, hasPermission, isProduction } = useAuth()
  const router = useRouter()

  useEffect(() => {
    if (!isLoading && !user) {
      router.push("/login")
    }
  }, [user, isLoading, router])

  // Checking the session, and the moment after it comes back empty and before
  // the redirect to /login lands, are the same state to the reader: "not yet".
  if (isLoading || !user) return <Loading full label="Checking your session…" />

  if (requiredRole && !hasRole(requiredRole)) {
    return <ErrorState className="py-24" title="Access denied" description={`This page requires the ${requiredRole} role.`} />
  }

  if (requiredPermission && !hasPermission(requiredPermission)) {
    return (
      <ErrorState
        className="py-24"
        title="Access denied"
        description={`This page requires the ${requiredPermission} permission.`}
      />
    )
  }

  return <>{children}</>
}