import { describe, it, expect, beforeEach } from 'vitest'
import request from 'supertest'
import { app } from '../server/server.js'
import { _resetForTest } from '../server/db.js'

beforeEach(() => _resetForTest())

const base = {
  name: 'traefik',
  vmid: 100,
  state: 'deployed',
  stack: 'production',
  atlas: 0, argus: 0, semaphore: 0, patchmon: 0, tailscale: 0, andromeda: 0,
  tailscale_ip: '',
  hardware_acceleration: 0,
}

// ── GET /api/instances ────────────────────────────────────────────────────────

describe('GET /api/instances', () => {
  it('returns empty array when no instances exist', async () => {
    const res = await request(app).get('/api/instances')
    expect(res.status).toBe(200)
    expect(res.body).toEqual([])
  })

  it('returns all instances sorted by name', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 1, name: 'zebra' })
    await request(app).post('/api/instances').send({ ...base, vmid: 2, name: 'alpha' })
    const res = await request(app).get('/api/instances')
    expect(res.status).toBe(200)
    expect(res.body).toHaveLength(2)
    expect(res.body[0].name).toBe('alpha')
    expect(res.body[1].name).toBe('zebra')
  })

  it('filters by state', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 1, name: 'a', state: 'deployed' })
    await request(app).post('/api/instances').send({ ...base, vmid: 2, name: 'b', state: 'degraded' })
    const res = await request(app).get('/api/instances?state=deployed')
    expect(res.body).toHaveLength(1)
    expect(res.body[0].name).toBe('a')
  })

  it('filters by stack', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 1, name: 'a', stack: 'production' })
    await request(app).post('/api/instances').send({ ...base, vmid: 2, name: 'b', stack: 'development', state: 'testing' })
    const res = await request(app).get('/api/instances?stack=development')
    expect(res.body).toHaveLength(1)
    expect(res.body[0].name).toBe('b')
  })

  it('searches by name substring', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 1, name: 'plex' })
    await request(app).post('/api/instances').send({ ...base, vmid: 2, name: 'gitea' })
    const res = await request(app).get('/api/instances?search=ple')
    expect(res.body).toHaveLength(1)
    expect(res.body[0].name).toBe('plex')
  })

  it('searches by vmid', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 137, name: 'a' })
    await request(app).post('/api/instances').send({ ...base, vmid: 200, name: 'b' })
    const res = await request(app).get('/api/instances?search=137')
    expect(res.body).toHaveLength(1)
    expect(res.body[0].vmid).toBe(137)
  })

  it('combines search and state filters', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 1, name: 'plex', state: 'deployed' })
    await request(app).post('/api/instances').send({ ...base, vmid: 2, name: 'plex2', state: 'degraded' })
    const res = await request(app).get('/api/instances?search=plex&state=deployed')
    expect(res.body).toHaveLength(1)
    expect(res.body[0].name).toBe('plex')
  })
})

// ── GET /api/instances/stacks ─────────────────────────────────────────────────

describe('GET /api/instances/stacks', () => {
  it('returns empty array when no instances exist', async () => {
    const res = await request(app).get('/api/instances/stacks')
    expect(res.status).toBe(200)
    expect(res.body).toEqual([])
  })

  it('returns unique stacks sorted alphabetically', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 1, name: 'a', stack: 'production' })
    await request(app).post('/api/instances').send({ ...base, vmid: 2, name: 'b', stack: 'development', state: 'testing' })
    await request(app).post('/api/instances').send({ ...base, vmid: 3, name: 'c', stack: 'production' })
    const res = await request(app).get('/api/instances/stacks')
    expect(res.body).toEqual(['development', 'production'])
  })
})

// ── GET /api/instances/:vmid ──────────────────────────────────────────────────

describe('GET /api/instances/:vmid', () => {
  it('returns the instance for a known vmid', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 117, name: 'plex' })
    const res = await request(app).get('/api/instances/117')
    expect(res.status).toBe(200)
    expect(res.body.name).toBe('plex')
    expect(res.body.vmid).toBe(117)
  })

  it('returns 404 for unknown vmid', async () => {
    const res = await request(app).get('/api/instances/999')
    expect(res.status).toBe(404)
    expect(res.body.error).toBeDefined()
  })

  it('returns 400 for non-numeric vmid', async () => {
    const res = await request(app).get('/api/instances/abc')
    expect(res.status).toBe(400)
  })
})

// ── POST /api/instances ───────────────────────────────────────────────────────

describe('POST /api/instances', () => {
  it('creates an instance and returns 201 with the created record', async () => {
    const res = await request(app).post('/api/instances').send(base)
    expect(res.status).toBe(201)
    expect(res.body.name).toBe('traefik')
    expect(res.body.vmid).toBe(100)
    expect(res.body.created_at).not.toBeNull()
    expect(res.body.updated_at).not.toBeNull()
  })

  it('stores service flags correctly', async () => {
    const res = await request(app).post('/api/instances').send({ ...base, atlas: 1, tailscale: 1, hardware_acceleration: 1 })
    expect(res.body.atlas).toBe(1)
    expect(res.body.tailscale).toBe(1)
    expect(res.body.hardware_acceleration).toBe(1)
    expect(res.body.argus).toBe(0)
  })

  it('returns 409 for duplicate vmid', async () => {
    await request(app).post('/api/instances').send(base)
    const res = await request(app).post('/api/instances').send({ ...base, name: 'other' })
    expect(res.status).toBe(409)
    expect(res.body.error).toMatch(/vmid/)
  })

  it('returns 400 when name is missing', async () => {
    const res = await request(app).post('/api/instances').send({ ...base, name: '' })
    expect(res.status).toBe(400)
    expect(res.body.errors).toBeInstanceOf(Array)
  })

  it('returns 400 for vmid less than 1', async () => {
    const res = await request(app).post('/api/instances').send({ ...base, vmid: 0 })
    expect(res.status).toBe(400)
    expect(res.body.errors).toBeInstanceOf(Array)
  })

  it('returns 400 for invalid state', async () => {
    const res = await request(app).post('/api/instances').send({ ...base, state: 'invalid' })
    expect(res.status).toBe(400)
  })

  it('returns 400 for invalid stack', async () => {
    const res = await request(app).post('/api/instances').send({ ...base, stack: 'invalid' })
    expect(res.status).toBe(400)
  })

  it('trims whitespace from name', async () => {
    const res = await request(app).post('/api/instances').send({ ...base, name: '  plex  ' })
    expect(res.status).toBe(201)
    expect(res.body.name).toBe('plex')
  })
})

// ── PUT /api/instances/:vmid ──────────────────────────────────────────────────

describe('PUT /api/instances/:vmid', () => {
  it('updates fields and returns the updated record', async () => {
    await request(app).post('/api/instances').send(base)
    const res = await request(app).put('/api/instances/100').send({ ...base, name: 'updated', state: 'degraded' })
    expect(res.status).toBe(200)
    expect(res.body.name).toBe('updated')
    expect(res.body.state).toBe('degraded')
  })

  it('can change the vmid', async () => {
    await request(app).post('/api/instances').send(base)
    await request(app).put('/api/instances/100').send({ ...base, vmid: 200 })
    expect((await request(app).get('/api/instances/100')).status).toBe(404)
    expect((await request(app).get('/api/instances/200')).status).toBe(200)
  })

  it('returns 404 for unknown vmid', async () => {
    const res = await request(app).put('/api/instances/999').send(base)
    expect(res.status).toBe(404)
  })

  it('returns 400 for validation errors', async () => {
    await request(app).post('/api/instances').send(base)
    const res = await request(app).put('/api/instances/100').send({ ...base, name: '' })
    expect(res.status).toBe(400)
    expect(res.body.errors).toBeInstanceOf(Array)
  })

  it('returns 409 when new vmid conflicts with an existing instance', async () => {
    await request(app).post('/api/instances').send({ ...base, vmid: 100, name: 'a' })
    await request(app).post('/api/instances').send({ ...base, vmid: 200, name: 'b' })
    const res = await request(app).put('/api/instances/100').send({ ...base, vmid: 200 })
    expect(res.status).toBe(409)
  })
})

// ── DELETE /api/instances/:vmid ───────────────────────────────────────────────

describe('DELETE /api/instances/:vmid', () => {
  it('deletes a development instance and returns 204', async () => {
    await request(app).post('/api/instances').send({ ...base, stack: 'development', state: 'testing' })
    const res = await request(app).delete('/api/instances/100')
    expect(res.status).toBe(204)
    expect((await request(app).get('/api/instances/100')).status).toBe(404)
  })

  it('returns 422 when attempting to delete a production instance', async () => {
    await request(app).post('/api/instances').send({ ...base, stack: 'production' })
    const res = await request(app).delete('/api/instances/100')
    expect(res.status).toBe(422)
    expect(res.body.error).toMatch(/development/)
  })

  it('returns 404 for unknown vmid', async () => {
    const res = await request(app).delete('/api/instances/999')
    expect(res.status).toBe(404)
  })

  it('returns 400 for non-numeric vmid', async () => {
    const res = await request(app).delete('/api/instances/abc')
    expect(res.status).toBe(400)
  })
})