import { afterEach, describe, expect, it } from 'vitest'
import { createMemoryDb, runMigrations, repos } from '@evofw/db'
import { previewLabelAssignmentSchema, applyLabelAssignmentSchema, permissionForRequest } from '@evofw/shared'
import { createAgentLabel, patchAgentLabel, putAgentLabels, previewLabelAssignment, applyLabelAssignment } from './labels.js'
import { createPolicySnapshot, startPolicyRollout } from './policy/rollouts.js'
import { buildApp } from '../app.js'
import { loadConfig } from '../config.js'

const opened: ReturnType<typeof createMemoryDb>[] = []
afterEach(() => { for (const mem of opened.splice(0)) mem.sqlite.close() })
function memory(count = 3) {
  const mem = createMemoryDb(); opened.push(mem); runMigrations(mem.sqlite)
  for (let index = 0; index < count; index++) repos.insertAgent(mem.db, { id: `a${index}`, name: `Agent ${index}`, tokenHash: `t${index}`, tokenPrefix: `t${index}`, status: 'approved', telemetryVersion: 2, capabilitiesJson: '["policy-ipv4"]' })
  for (const id of ['old', 'new', 'third']) repos.insertPolicySet(mem.db, { id, name: id })
  return mem
}
describe('labels and materialized group assignment', () => {
  it('treats labels as metadata, uses normalized unique names and atomically validates replacement', () => {
    const { db } = memory()
    const label = createAgentLabel(db, { name: 'Production', color: 'success' })
    expect(() => createAgentLabel(db, { name: 'PRODUCTION' })).toThrow('already exists')
    putAgentLabels(db, 'a0', [label.id])
    patchAgentLabel(db, label.id, { name: 'Production fleet' })
    expect(repos.getAgent(db, 'a0')!.policyGeneration).toBe(1)
    expect(() => putAgentLabels(db, 'a0', ['missing'])).toThrow('Label not found')
    expect(repos.agentLabelIds(db, 'a0')).toEqual([label.id])
    repos.deleteAgentLabel(db, label.id)
    expect(repos.agentLabelIds(db, 'a0')).toEqual([])
    expect(repos.getAgent(db, 'a0')!.policyGeneration).toBe(1)
  })

  it('preserves existing order in add, performs exact replace and skips identical assignments', () => {
    const { db } = memory()
    repos.setAgentPolicySets(db, 'a0', ['old', 'third'])
    const request = { selector: { agent_ids: ['a0', 'a1'] }, mode: 'add' as const, set_ids: ['third', 'new'] }
    const preview = previewLabelAssignment(db, request)
    expect(preview.items[0]!.set_ids).toEqual(['old', 'third', 'new'])
    const result = applyLabelAssignment(db, { ...request, expected: preview.items.map((row) => ({ agent_id: row.agent_id, generation: row.generation })) })
    expect(result.affected_agent_ids).toEqual(['a0', 'a1'])
    const again = previewLabelAssignment(db, request)
    const unchanged = applyLabelAssignment(db, { ...request, expected: again.items.map((row) => ({ agent_id: row.agent_id, generation: row.generation })) })
    expect(unchanged.affected_agent_ids).toEqual([])
    expect(unchanged.items.map((row) => row.generation)).toEqual(again.items.map((row) => row.generation))
    const replace = { selector: { agent_ids: ['a0'] }, mode: 'replace' as const, set_ids: ['new'] }
    const replacement = previewLabelAssignment(db, replace)
    applyLabelAssignment(db, { ...replace, expected: replacement.items.map((row) => ({ agent_id: row.agent_id, generation: row.generation })) })
    expect(repos.listSetsForAgent(db, 'a0').map((row) => row.setId)).toEqual(['new'])
  })

  it('requires exact materialized membership and generations; later labels never autoassign', () => {
    const { db } = memory()
    const label = createAgentLabel(db, { name: 'Canaries' })
    putAgentLabels(db, 'a0', [label.id])
    const request = { selector: { label_ids: [label.id] }, mode: 'replace' as const, set_ids: ['new'] }
    const preview = previewLabelAssignment(db, request)
    const expected = preview.items.map((row) => ({ agent_id: row.agent_id, generation: row.generation }))
    putAgentLabels(db, 'a1', [label.id])
    expect(() => applyLabelAssignment(db, { ...request, expected })).toThrow('membership')
    expect(repos.listSetsForAgent(db, 'a0')).toHaveLength(0)
    putAgentLabels(db, 'a1', [])
    applyLabelAssignment(db, { ...request, expected })
    putAgentLabels(db, 'a1', [label.id])
    expect(repos.listSetsForAgent(db, 'a1')).toHaveLength(0)
    expect(() => applyLabelAssignment(db, { ...request, expected })).toThrow('generation')
  })

  it('rejects invalid sets and pinned targets before writing any agent', () => {
    const { db } = memory()
    const request = { selector: { agent_ids: ['a0', 'a1'] }, mode: 'replace' as const, set_ids: ['new'] }
    const preview = previewLabelAssignment(db, request)
    const expected = preview.items.map((row) => ({ agent_id: row.agent_id, generation: row.generation }))
    expect(() => applyLabelAssignment(db, { ...request, set_ids: ['new', 'missing'], expected })).toThrow('Policy set not found')
    expect(repos.listSetsForAgent(db, 'a0')).toHaveLength(0)
    const snapshot = createPolicySnapshot(db, 'a2', 'Empty')
    startPolicyRollout(db, { snapshot_id: snapshot.id, targets: [{ agent_id: 'a1', expected_generation: 1 }], canary_ids: ['a1'] })
    expect(() => applyLabelAssignment(db, { ...request, expected })).toThrow('Release')
    expect(repos.listSetsForAgent(db, 'a0')).toHaveLength(0)
    expect(repos.getAgent(db, 'a0')!.policyGeneration).toBe(1)
  })

  it('supports exactly 100 selected agents and rejects a 101-agent label group without truncation', () => {
    const { db } = memory(101)
    const label = createAgentLabel(db, { name: 'Large group' })
    for (let index = 0; index < 100; index++) putAgentLabels(db, `a${index}`, [label.id])
    const request = { selector: { label_ids: [label.id] }, mode: 'add' as const, set_ids: ['new'] }
    const preview = previewLabelAssignment(db, request)
    expect(preview.total).toBe(100)
    const applied = applyLabelAssignment(db, { ...request, expected: preview.items.map((row) => ({ agent_id: row.agent_id, generation: row.generation })) })
    expect(applied.affected_agent_ids).toHaveLength(100)
    expect(repos.listSetsForAgent(db, 'a100')).toHaveLength(0)
    putAgentLabels(db, 'a100', [label.id])
    expect(() => previewLabelAssignment(db, request)).toThrow('100 agents')
    expect(repos.listSetsForAgent(db, 'a100')).toHaveLength(0)
    expect(previewLabelAssignmentSchema.safeParse({ ...request, selector: { agent_ids: ['a0'], label_ids: [label.id] } }).success).toBe(false)
    expect(applyLabelAssignmentSchema.safeParse({ ...request, expected: [{ agent_id: 'a0', generation: 1 }, { agent_id: 'a0', generation: 1 }] }).success).toBe(false)
  })

  it('provides HTTP label CRUD, AND fleet filtering and permission separation', async () => {
    const app = await buildApp({ memory: true, config: { ...loadConfig(), authRequired: false, staticDir: null, logLevel: 'error' } })
    try {
      await app.ready()
      for (const id of ['a', 'b']) repos.insertAgent(app.db, { id, name: id, tokenPrefix: id, tokenHash: id })
      const one = await app.inject({ method: 'POST', url: '/api/v1/agent-labels', payload: { name: 'One' } })
      const two = await app.inject({ method: 'POST', url: '/api/v1/agent-labels', payload: { name: 'Two' } })
      expect(one.statusCode).toBe(201)
      expect(one.json().name_key).toBeUndefined()
      await app.inject({ method: 'PUT', url: '/api/v1/agents/a/labels', payload: { label_ids: [one.json().id, two.json().id] } })
      await app.inject({ method: 'PUT', url: '/api/v1/agents/b/labels', payload: { label_ids: [one.json().id] } })
      const filtered = await app.inject({ url: `/api/v1/agents?label_ids=${one.json().id},${two.json().id}` })
      expect(filtered.json().items.map((row: { id: string }) => row.id)).toEqual(['a'])
      expect((await app.inject({ url: '/api/v1/agents?label_ids=' })).json().items).toHaveLength(2)
      expect(permissionForRequest('POST', '/api/v1/agent-labels/preview-assignment')).toBe('fw:policies:read')
      expect(permissionForRequest('POST', '/api/v1/agent-labels/assign-policy-sets')).toBe('fw:policies:write')
      expect(permissionForRequest('POST', '/api/v1/agent-labels')).toBe('fw:agents:write')
    } finally { await app.close() }
  })
})