/**
 * Tests for mcp-auth.ts - Auth storage module
 */

import { describe, it, before, after } from "node:test"
import assert from "node:assert"
import { mkdirSync, rmSync, existsSync } from "fs"
import { join } from "path"
import { tmpdir } from "os"
import { randomBytes } from "crypto"

// Set up isolated temp directory for tests
const TEST_DIR = join(tmpdir(), `mcp-oauth-test-${randomBytes(4).toString('hex')}`)
process.env.MCP_OAUTH_DIR = TEST_DIR

import {
  getAuthEntry,
  getAuthForUrl,
  saveAuthEntry,
  removeAuthEntry,
  updateTokens,
  updateClientInfo,
  updateCodeVerifier,
  clearCodeVerifier,
  updateOAuthState,
  getOAuthState,
  clearOAuthState,
  isTokenExpired,
  hasStoredTokens,
  clearAllCredentials,
  clearClientInfo,
  clearTokens,
  type AuthEntry,
} from "./mcp-auth.ts"

describe("mcp-auth", () => {
  before(() => {
    // Ensure clean state
    try {
      if (existsSync(TEST_DIR)) {
        rmSync(TEST_DIR, { recursive: true, force: true })
      }
      mkdirSync(TEST_DIR, { recursive: true })
    } catch {
      // Ignore cleanup errors
    }
  })

  after(() => {
    // Clean up temp directory
    try {
      if (existsSync(TEST_DIR)) {
        rmSync(TEST_DIR, { recursive: true, force: true })
      }
    } catch {
      // Ignore cleanup errors
    }
  })

  describe("getAuthEntry", () => {
    it("should return undefined for non-existent entry", () => {
      const entry = getAuthEntry("non-existent")
      assert.strictEqual(entry, undefined)
    })
  })

  describe("saveAuthEntry / getAuthEntry", () => {
    it("should save and retrieve an auth entry", () => {
      const entry: AuthEntry = {
        tokens: {
          accessToken: "test-token",
          refreshToken: "refresh-token",
          expiresAt: 1234567890,
          scope: "read write",
        },
        serverUrl: "https://api.example.com",
      }

      saveAuthEntry("test-server", entry, "https://api.example.com")
      const retrieved = getAuthEntry("test-server")

      assert.deepStrictEqual(retrieved, entry)
    })

    it("should update existing entries", () => {
      const entry1: AuthEntry = {
        tokens: { accessToken: "token1" },
        serverUrl: "https://api.example.com",
      }
      const entry2: AuthEntry = {
        tokens: { accessToken: "token2" },
        serverUrl: "https://api.example.com",
      }

      saveAuthEntry("test-server", entry1, "https://api.example.com")
      saveAuthEntry("test-server", entry2, "https://api.example.com")
      const retrieved = getAuthEntry("test-server")

      assert.strictEqual(retrieved?.tokens?.accessToken, "token2")
    })
  })

  describe("getAuthForUrl", () => {
    it("should return entry when URL matches", () => {
      const entry: AuthEntry = {
        tokens: { accessToken: "test-token" },
        serverUrl: "https://api.example.com",
      }

      saveAuthEntry("test-server", entry, "https://api.example.com")
      const retrieved = getAuthForUrl("test-server", "https://api.example.com")

      assert.deepStrictEqual(retrieved, entry)
    })

    it("should return undefined when URL doesn't match", () => {
      const entry: AuthEntry = {
        tokens: { accessToken: "test-token" },
        serverUrl: "https://api.example.com",
      }

      saveAuthEntry("test-server", entry, "https://api.example.com")
      const retrieved = getAuthForUrl("test-server", "https://different.com")

      assert.strictEqual(retrieved, undefined)
    })

    it("should return undefined when serverUrl is not stored", () => {
      const entry: AuthEntry = {
        tokens: { accessToken: "test-token" },
      }

      saveAuthEntry("test-server", entry)
      const retrieved = getAuthForUrl("test-server", "https://api.example.com")

      assert.strictEqual(retrieved, undefined)
    })
  })

  describe("removeAuthEntry", () => {
    it("should remove an entry", () => {
      const entry: AuthEntry = {
        tokens: { accessToken: "test-token" },
      }

      saveAuthEntry("test-server", entry)
      removeAuthEntry("test-server")
      const retrieved = getAuthEntry("test-server")

      assert.strictEqual(retrieved, undefined)
    })
  })

  describe("updateTokens", () => {
    it("should update tokens for a server", () => {
      updateTokens("test-server", {
        accessToken: "new-token",
        refreshToken: "new-refresh",
        expiresAt: 1234567890,
        scope: "read",
      })

      const entry = getAuthEntry("test-server")
      assert.strictEqual(entry?.tokens?.accessToken, "new-token")
    })

    it("should preserve existing client info", () => {
      updateClientInfo("test-server", { clientId: "client-123" })
      updateTokens("test-server", { accessToken: "token" })

      const entry = getAuthEntry("test-server")
      assert.strictEqual(entry?.clientInfo?.clientId, "client-123")
      assert.strictEqual(entry?.tokens?.accessToken, "token")
    })

    it("should clear URL-bound auth state when tokens move to a different server URL", () => {
      saveAuthEntry("token-url-change", {
        tokens: { accessToken: "old-token", refreshToken: "old-refresh" },
        clientInfo: { clientId: "old-client" },
        codeVerifier: "old-verifier",
        oauthState: "old-state",
        serverUrl: "https://old.example.com/mcp",
      }, "https://old.example.com/mcp")

      updateTokens("token-url-change", { accessToken: "new-token" }, "https://new.example.com/mcp")

      assert.strictEqual(getAuthForUrl("token-url-change", "https://old.example.com/mcp"), undefined)
      const newEntry = getAuthForUrl("token-url-change", "https://new.example.com/mcp")
      assert.strictEqual(newEntry?.tokens?.accessToken, "new-token")
      assert.strictEqual(newEntry?.clientInfo, undefined)
      assert.strictEqual(newEntry?.codeVerifier, undefined)
      assert.strictEqual(newEntry?.oauthState, undefined)
    })

    it("should clear legacy URL-bound auth state when saving tokens with a server URL", () => {
      saveAuthEntry("token-legacy-url-change", {
        tokens: { accessToken: "old-token", refreshToken: "old-refresh" },
        clientInfo: { clientId: "old-client" },
        codeVerifier: "old-verifier",
        oauthState: "old-state",
      })

      updateTokens("token-legacy-url-change", { accessToken: "new-token" }, "https://new.example.com/mcp")

      const newEntry = getAuthForUrl("token-legacy-url-change", "https://new.example.com/mcp")
      assert.strictEqual(newEntry?.tokens?.accessToken, "new-token")
      assert.strictEqual(newEntry?.clientInfo, undefined)
      assert.strictEqual(newEntry?.codeVerifier, undefined)
      assert.strictEqual(newEntry?.oauthState, undefined)
    })
  })

  describe("updateClientInfo", () => {
    it("should update client info for a server", () => {
      updateClientInfo("test-server", {
        clientId: "client-123",
        clientSecret: "secret",
        clientIdIssuedAt: 1234567890,
        clientSecretExpiresAt: 1234567999,
      })

      const entry = getAuthEntry("test-server")
      assert.strictEqual(entry?.clientInfo?.clientId, "client-123")
      assert.strictEqual(entry?.clientInfo?.clientSecret, "secret")
    })

    it("should clear URL-bound credentials when client info moves to a different server URL", () => {
      saveAuthEntry("url-change", {
        tokens: { accessToken: "old-token", refreshToken: "old-refresh" },
        clientInfo: { clientId: "old-client" },
        codeVerifier: "old-verifier",
        oauthState: "old-state",
        serverUrl: "https://old.example.com/mcp",
      }, "https://old.example.com/mcp")

      updateClientInfo("url-change", { clientId: "new-client" }, "https://new.example.com/mcp")

      assert.strictEqual(getAuthForUrl("url-change", "https://old.example.com/mcp"), undefined)
      const newEntry = getAuthForUrl("url-change", "https://new.example.com/mcp")
      assert.strictEqual(newEntry?.clientInfo?.clientId, "new-client")
      assert.strictEqual(newEntry?.tokens, undefined)
      assert.strictEqual(newEntry?.codeVerifier, undefined)
      assert.strictEqual(newEntry?.oauthState, undefined)
    })

    it("should clear stale verifier and state when legacy client info gains a server URL", () => {
      saveAuthEntry("legacy-url-change", {
        tokens: { accessToken: "old-token", refreshToken: "old-refresh" },
        clientInfo: { clientId: "old-client" },
        codeVerifier: "old-verifier",
        oauthState: "old-state",
      })

      updateClientInfo("legacy-url-change", { clientId: "new-client" }, "https://new.example.com/mcp")

      const newEntry = getAuthForUrl("legacy-url-change", "https://new.example.com/mcp")
      assert.strictEqual(newEntry?.clientInfo?.clientId, "new-client")
      assert.strictEqual(newEntry?.tokens, undefined)
      assert.strictEqual(newEntry?.codeVerifier, undefined)
      assert.strictEqual(newEntry?.oauthState, undefined)
    })
  })

  describe("updateCodeVerifier / clearCodeVerifier", () => {
    it("should save and retrieve code verifier", () => {
      updateCodeVerifier("test-server", "verifier-123")
      const entry = getAuthEntry("test-server")
      assert.strictEqual(entry?.codeVerifier, "verifier-123")
    })

    it("should clear code verifier", () => {
      updateCodeVerifier("test-server", "verifier-123")
      clearCodeVerifier("test-server")
      const entry = getAuthEntry("test-server")
      assert.strictEqual(entry?.codeVerifier, undefined)
    })
  })

  describe("updateOAuthState / getOAuthState / clearOAuthState", () => {
    it("should save and retrieve OAuth state", () => {
      updateOAuthState("test-server", "state-abc-123")
      const state = getOAuthState("test-server")
      assert.strictEqual(state, "state-abc-123")
    })

    it("should clear OAuth state", () => {
      updateOAuthState("test-server", "state-abc-123")
      clearOAuthState("test-server")
      const state = getOAuthState("test-server")
      assert.strictEqual(state, undefined)
    })
  })

  describe("isTokenExpired", () => {
    it("should return null if no tokens", () => {
      const expired = isTokenExpired("expiry-test-null")
      assert.strictEqual(expired, null)
    })

    it("should return false if no expiry", () => {
      updateTokens("expiry-test-no-expiry", { accessToken: "token" })
      const expired = isTokenExpired("expiry-test-no-expiry")
      assert.strictEqual(expired, false)
    })

    it("should return true if expired", () => {
      updateTokens("expiry-test-expired", {
        accessToken: "token",
        expiresAt: 1, // Way in the past
      })
      const expired = isTokenExpired("expiry-test-expired")
      assert.strictEqual(expired, true)
    })

    it("should return false if not expired", () => {
      updateTokens("expiry-test-future", {
        accessToken: "token",
        expiresAt: Date.now() / 1000 + 3600, // 1 hour from now
      })
      const expired = isTokenExpired("expiry-test-future")
      assert.strictEqual(expired, false)
    })
  })

  describe("hasStoredTokens", () => {
    it("should return false if no tokens", () => {
      assert.strictEqual(hasStoredTokens("has-tokens-test-false"), false)
    })

    it("should return true if tokens exist", () => {
      updateTokens("has-tokens-test-true", { accessToken: "token" })
      assert.strictEqual(hasStoredTokens("has-tokens-test-true"), true)
    })
  })

  describe("clearAllCredentials", () => {
    it("should remove all credentials", () => {
      updateTokens("test-server", { accessToken: "token" })
      updateClientInfo("test-server", { clientId: "client" })
      updateCodeVerifier("test-server", "verifier")

      clearAllCredentials("test-server")

      assert.strictEqual(getAuthEntry("test-server"), undefined)
    })
  })

  describe("clearClientInfo", () => {
    it("should only remove client info", () => {
      updateTokens("test-server", { accessToken: "token" })
      updateClientInfo("test-server", { clientId: "client" })

      clearClientInfo("test-server")

      const entry = getAuthEntry("test-server")
      assert.strictEqual(entry?.clientInfo, undefined)
      assert.strictEqual(entry?.tokens?.accessToken, "token")
    })
  })

  describe("clearTokens", () => {
    it("should only remove tokens", () => {
      updateTokens("test-server", { accessToken: "token" })
      updateClientInfo("test-server", { clientId: "client" })

      clearTokens("test-server")

      const entry = getAuthEntry("test-server")
      assert.strictEqual(entry?.tokens, undefined)
      assert.strictEqual(entry?.clientInfo?.clientId, "client")
    })
  })
})