import path from "path"
import fs from "fs/promises"
import z from "zod"
import { Global } from "../global"

export namespace McpAuth {
  export const Tokens = z.object({
    accessToken: z.string(),
    refreshToken: z.string().optional(),
    expiresAt: z.number().optional(),
    scope: z.string().optional(),
  })
  export type Tokens = z.infer<typeof Tokens>

  export const ClientInfo = z.object({
    clientId: z.string(),
    clientSecret: z.string().optional(),
    clientIdIssuedAt: z.number().optional(),
    clientSecretExpiresAt: z.number().optional(),
  })
  export type ClientInfo = z.infer<typeof ClientInfo>

  export const Entry = z.object({
    tokens: Tokens.optional(),
    clientInfo: ClientInfo.optional(),
    codeVerifier: z.string().optional(),
  })
  export type Entry = z.infer<typeof Entry>

  const filepath = path.join(Global.Path.data, "mcp-auth.json")

  export async function get(mcpName: string): Promise<Entry | undefined> {
    const data = await all()
    return data[mcpName]
  }

  export async function all(): Promise<Record<string, Entry>> {
    const file = Bun.file(filepath)
    return file.json().catch(() => ({}))
  }

  export async function set(mcpName: string, entry: Entry): Promise<void> {
    const file = Bun.file(filepath)
    const data = await all()
    await Bun.write(file, JSON.stringify({ ...data, [mcpName]: entry }, null, 2))
    await fs.chmod(file.name!, 0o600)
  }

  export async function remove(mcpName: string): Promise<void> {
    const file = Bun.file(filepath)
    const data = await all()
    delete data[mcpName]
    await Bun.write(file, JSON.stringify(data, null, 2))
    await fs.chmod(file.name!, 0o600)
  }

  export async function updateTokens(mcpName: string, tokens: Tokens): Promise<void> {
    const entry = (await get(mcpName)) ?? {}
    entry.tokens = tokens
    await set(mcpName, entry)
  }

  export async function updateClientInfo(mcpName: string, clientInfo: ClientInfo): Promise<void> {
    const entry = (await get(mcpName)) ?? {}
    entry.clientInfo = clientInfo
    await set(mcpName, entry)
  }

  export async function updateCodeVerifier(mcpName: string, codeVerifier: string): Promise<void> {
    const entry = (await get(mcpName)) ?? {}
    entry.codeVerifier = codeVerifier
    await set(mcpName, entry)
  }

  export async function clearCodeVerifier(mcpName: string): Promise<void> {
    const entry = await get(mcpName)
    if (entry) {
      delete entry.codeVerifier
      await set(mcpName, entry)
    }
  }
}