import { describe, it, before, after } from 'node:test'
import assert from 'node:assert/strict'
import { spawn } from 'node:child_process'
import {
  mkdtemp, mkdir, open, rm, writeFile,
} from 'node:fs/promises'
import os from 'node:os'
import path from 'node:path'
import process from 'node:process'
import { clearTimeout, setTimeout } from 'node:timers'
import { fileURLToPath } from 'node:url'
import { Client } from '@modelcontextprotocol/sdk/client/index.js'
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js'
import {
  findMarkdownFiles, getNote, searchNotes, vaultContext,
} from './vault.js'
import { requireVaultPath, requireVaultPaths } from './vault-path.js'
import { vaultContextWithInstructions } from './agent-instructions.js'
import { evaluateBridgeRequest } from './ws-bridge.js'

let tmpDir
const ACTIVE_VAULT_ERROR = 'Note path must stay inside the active vault'
const MCP_SERVER_DIR = path.dirname(fileURLToPath(import.meta.url))

before(async () => {
  tmpDir = await mkdtemp(path.join(os.tmpdir(), 'laputa-mcp-test-'))

  await mkdir(path.join(tmpDir, 'project'), { recursive: true })
  await mkdir(path.join(tmpDir, 'note'), { recursive: true })

  await writeTextFile(path.join(tmpDir, 'project', 'test-project.md'), `---
title: Test Project
is_a: Project
status: Active
---

# Test Project

This is a test project for the MCP server.
`)

  await writeTextFile(path.join(tmpDir, 'note', 'daily-log.md'), `---
title: Daily Log
is_a: Note
---

# Daily Log

Today I worked on the MCP server implementation.
`)

  await writeTextFile(path.join(tmpDir, 'note', 'hashtag-tags.md'), `---
title: Hashtag Tags
type: Note
tags: [#abc, def, ghi]
---

# Hashtag Tags

This note has AI-generated hashtag-style YAML tags.
`)

  await writeTextFile(path.join(tmpDir, 'project', 'second-project.md'), `---
title: Second Project
type: Project
status: Draft
belongs_to:
  - "[[project/test-project]]"
---

# Second Project

Another project for testing list and context.
`)
})

after(async () => {
  await rm(tmpDir, { recursive: true, force: true })
})

describe('findMarkdownFiles', () => {
  it('should find all .md files recursively', async () => {
    const files = await findMarkdownFiles(tmpDir)
    assert.equal(files.length, 4)
    assert.ok(files.some(f => f.endsWith('test-project.md')))
    assert.ok(files.some(f => f.endsWith('daily-log.md')))
    assert.ok(files.some(f => f.endsWith('second-project.md')))
    assert.ok(files.some(f => f.endsWith('hashtag-tags.md')))
  })
})

describe('getNote', () => {
  it('should read a note with parsed frontmatter', async () => {
    const note = await getNote(tmpDir, 'project/test-project.md')
    assert.equal(note.path, 'project/test-project.md')
    assert.equal(note.frontmatter.title, 'Test Project')
    assert.equal(note.frontmatter.is_a, 'Project')
    assert.ok(note.content.includes('test project for the MCP server'))
  })

  it('should tolerate hashtag-style tags in malformed YAML frontmatter', async () => {
    const note = await getNote(tmpDir, 'note/hashtag-tags.md')
    assert.equal(note.path, 'note/hashtag-tags.md')
    assert.equal(note.frontmatter.title, 'Hashtag Tags')
    assert.equal(note.frontmatter.type, 'Note')
    assert.deepEqual(note.frontmatter.tags, ['#abc', 'def', 'ghi'])
    assert.ok(note.content.includes('has AI-generated hashtag-style YAML tags'))
  })

  it('should throw for missing notes', async () => {
    await assert.rejects(
      () => getNote(tmpDir, 'nonexistent.md'),
      { code: 'ENOENT' }
    )
  })

  it('should reject absolute paths outside the vault', async () => {
    await assertRejectsOutsideVault('laputa-mcp-outside-', outsideNote => outsideNote)
  })

  it('should reject traversal paths outside the vault', async () => {
    await assertRejectsOutsideVault(
      'laputa-mcp-traversal-',
      outsideNote => path.relative(tmpDir, outsideNote),
    )
  })
})

describe('searchNotes', () => {
  it('should find notes matching title', async () => {
    const results = await searchNotes(tmpDir, 'Test Project')
    assert.ok(results.length >= 1)
    assert.equal(results[0].title, 'Test Project')
  })

  it('should find notes matching content', async () => {
    const results = await searchNotes(tmpDir, 'MCP server')
    assert.ok(results.length >= 1)
  })

  it('should return empty for no matches', async () => {
    const results = await searchNotes(tmpDir, 'xyzzy-nonexistent-12345')
    assert.equal(results.length, 0)
  })

  it('should respect limit', async () => {
    const results = await searchNotes(tmpDir, 'project', 1)
    assert.ok(results.length <= 1)
  })
})

describe('vaultContext', () => {
  it('should return types, recent notes, and vault path', async () => {
    const ctx = await vaultContext(tmpDir)
    assert.ok(Array.isArray(ctx.types))
    assert.ok(Array.isArray(ctx.recentNotes))
    assert.equal(ctx.vaultPath, tmpDir)
  })

  it('should include known entity types', async () => {
    const ctx = await vaultContext(tmpDir)
    assert.ok(ctx.types.includes('Project'))
    assert.ok(ctx.types.includes('Note'))
  })

  it('should include notes with hashtag-style tags in malformed YAML frontmatter', async () => {
    const ctx = await vaultContext(tmpDir)
    const note = ctx.recentNotes.find(entry => entry.path === 'note/hashtag-tags.md')
    assert.ok(note)
    assert.equal(note.title, 'Hashtag Tags')
    assert.equal(note.type, 'Note')
  })

  it('should cap recent notes at 20', async () => {
    const ctx = await vaultContext(tmpDir)
    assert.ok(ctx.recentNotes.length <= 20)
  })

  it('should include path and title in recent notes', async () => {
    const ctx = await vaultContext(tmpDir)
    for (const note of ctx.recentNotes) {
      assert.ok(note.path)
      assert.ok(note.title)
    }
  })

  it('should include folders', async () => {
    const ctx = await vaultContext(tmpDir)
    assert.ok(ctx.folders.includes('project/'))
    assert.ok(ctx.folders.includes('note/'))
  })

  it('should report correct note count', async () => {
    const ctx = await vaultContext(tmpDir)
    assert.equal(ctx.noteCount, 4)
  })

  it('includes root AGENTS.md instructions when present', async () => {
    const agentsPath = path.join(tmpDir, 'AGENTS.md')
    await writeFile(agentsPath, '# Vault Rules\n\nUse this vault carefully.\n', 'utf-8')

    try {
      const ctx = await vaultContextWithInstructions(tmpDir)
      assert.deepEqual(ctx.agentInstructions, {
        path: agentsPath,
        content: '# Vault Rules\n\nUse this vault carefully.\n',
      })
    } finally {
      await rm(agentsPath, { force: true })
    }
  })

  it('reports null agent instructions when AGENTS.md is absent', async () => {
    const ctx = await vaultContextWithInstructions(tmpDir)
    assert.equal(ctx.agentInstructions, null)
  })
})

describe('evaluateBridgeRequest', () => {
  it('accepts loopback UI requests from trusted origins', () => {
    assert.deepEqual(
      evaluateBridgeRequest({
        bridgeType: 'ui',
        origin: 'http://localhost:5202',
        remoteAddress: '127.0.0.1',
      }),
      { ok: true, reason: null },
    )
  })

  it('rejects browser origins on the tool bridge', () => {
    assert.deepEqual(
      evaluateBridgeRequest({
        bridgeType: 'tool',
        origin: 'https://evil.example',
        remoteAddress: '127.0.0.1',
      }),
      { ok: false, reason: 'browser origins are not allowed on the tool bridge' },
    )
  })

  it('rejects non-loopback clients even without an origin', () => {
    assert.deepEqual(
      evaluateBridgeRequest({
        bridgeType: 'ui',
        origin: undefined,
        remoteAddress: '192.168.1.10',
      }),
      { ok: false, reason: 'non-local client' },
    )
  })
})

describe('requireVaultPath', () => {
  it('returns the explicit configured vault path', () => {
    assert.equal(
      requireVaultPath({ VAULT_PATH: '/tmp/Selected Vault' }),
      '/tmp/Selected Vault',
    )
  })

  it('rejects missing vault paths instead of falling back to ~/Laputa', async () => {
    const configDir = await mkdtemp(path.join(os.tmpdir(), 'tolaria-mcp-empty-config-'))
    assert.throws(
      () => requireVaultPaths({}, { configDir }),
      /VAULT_PATH is required/,
    )
    await rm(configDir, { recursive: true, force: true })
  })

  it('returns all configured active vault paths with the primary vault first', () => {
    assert.deepEqual(
      requireVaultPaths({
        VAULT_PATH: '/tmp/Default Vault',
        VAULT_PATHS: JSON.stringify(['/tmp/Default Vault', '/tmp/Second Vault']),
      }),
      ['/tmp/Default Vault', '/tmp/Second Vault'],
    )
  })

  it('loads active mounted vault paths from Tolaria config when env is vault-neutral', async () => {
    const configDir = await mkdtemp(path.join(os.tmpdir(), 'tolaria-mcp-config-'))
    const primaryVault = path.join(configDir, 'Primary Vault')
    const secondaryVault = path.join(configDir, 'Secondary Vault')
    const hiddenVault = path.join(configDir, 'Hidden Vault')
    const configPath = path.join(configDir, 'com.tolaria.app', 'vaults.json')

    await mkdir(path.dirname(configPath), { recursive: true })
    await writeFile(configPath, JSON.stringify({
      active_vault: primaryVault,
      vaults: [
        { label: 'Secondary', path: secondaryVault, mounted: true },
        { label: 'Hidden', path: hiddenVault, mounted: false },
        { label: 'Primary', path: primaryVault, mounted: true },
      ],
    }), 'utf-8')

    try {
      assert.deepEqual(
        requireVaultPaths({}, { configDir }),
        [primaryVault, secondaryVault],
      )
    } finally {
      await rm(configDir, { recursive: true, force: true })
    }
  })
})

describe('stdio process lifecycle', () => {
  it('advertises local vault tools as approval-safe for MCP clients', async () => {
    const { client, stderr } = await connectMcpClient()

    try {
      const { tools } = await client.listTools()
      const toolsByName = new Map(tools.map(tool => [tool.name, tool]))
      const safeReadTools = [
        'search_notes',
        'get_vault_context',
        'list_vaults',
        'get_note',
        'open_note',
        'highlight_editor',
        'refresh_vault',
      ]

      for (const name of safeReadTools) {
        const tool = toolsByName.get(name)
        assert.ok(tool, `Missing MCP tool: ${name}`)
        assert.equal(tool.annotations?.readOnlyHint, true, `${name} should not require destructive approval`)
        assert.equal(tool.annotations?.destructiveHint, false, `${name} should not be treated as destructive`)
        assert.equal(tool.annotations?.openWorldHint, false, `${name} should stay scoped to local active vaults`)
      }
    } finally {
      await closeMcpClient(client, stderr)
    }
  })

  it('exits when the MCP client closes stdin', async () => {
    const child = spawn(process.execPath, ['index.js'], {
      cwd: MCP_SERVER_DIR,
      env: { ...process.env, VAULT_PATH: tmpDir, WS_UI_PORT: '65534' },
      stdio: ['pipe', 'ignore', 'pipe'],
    })
    let stderr = ''
    child.stderr.setEncoding('utf8')
    child.stderr.on('data', chunk => {
      stderr += chunk
    })

    await sleep(200)
    child.stdin.end()

    const exit = await waitForExit(child, 1_500)
    if (!exit) {
      child.kill()
      await waitForExit(child, 1_000)
      assert.fail(`MCP server stayed alive after stdin closed.\n${stderr}`)
    }

    assert.equal(exit.signal, null)
    assert.equal(exit.code, 0, stderr)
  })
})

async function connectMcpClient() {
  const transport = new StdioClientTransport({
    command: process.execPath,
    args: ['index.js'],
    cwd: MCP_SERVER_DIR,
    env: { ...process.env, VAULT_PATH: tmpDir, WS_UI_PORT: '65534' },
    stderr: 'pipe',
  })
  const stderr = collectTransportStderr(transport)
  const client = new Client(
    { name: 'tolaria-mcp-test-client', version: '0.0.0' },
    { capabilities: {} },
  )

  await client.connect(transport)
  return { client, stderr }
}

function collectTransportStderr(transport) {
  const chunks = []
  transport.stderr?.setEncoding('utf8')
  transport.stderr?.on('data', chunk => {
    chunks.push(chunk)
  })
  return () => chunks.join('')
}

async function closeMcpClient(client, stderr) {
  try {
    await client.close()
  } catch (error) {
    assert.fail(`Failed to close MCP test client: ${error.message}\n${stderr()}`)
  }
}

async function assertRejectsOutsideVault(prefix, resolveNotePath) {
  const outsideDir = await mkdtemp(path.join(os.tmpdir(), prefix))
  const outsideNote = path.join(outsideDir, 'outside.md')

  try {
    await writeTextFile(outsideNote, '# Outside\n')
    await assert.rejects(
      () => getNote(tmpDir, resolveNotePath(outsideNote)),
      { message: ACTIVE_VAULT_ERROR },
    )
  } finally {
    await rm(outsideDir, { recursive: true, force: true })
  }
}

async function writeTextFile(filePath, content) {
  const handle = await open(filePath, 'w')
  try {
    await handle.writeFile(content, 'utf-8')
  } finally {
    await handle.close()
  }
}

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms))
}

function waitForExit(child, timeoutMs) {
  return new Promise((resolve) => {
    const timer = setTimeout(() => {
      cleanup()
      resolve(null)
    }, timeoutMs)

    child.once('exit', onExit)

    function onExit(code, signal) {
      cleanup()
      resolve({ code, signal })
    }

    function cleanup() {
      clearTimeout(timer)
      child.off('exit', onExit)
    }
  })
}