import { readFileSync } from 'node:fs'
import * as path from 'node:path'
import { describe, expect, it } from 'vitest'
import {
  composeBrainstormTemplate,
  planPromptMigration,
  PROMPT_TEMPLATE_VERSION,
  splitIfBlock,
  upgradePlaceholders,
} from './promptMigration'

const defaultBrainstorm = readFileSync(
  path.resolve(__dirname, '../../prompts/brainstorm.md'),
  'utf-8',
)

describe('upgradePlaceholders', () => {
  it('已知占位符改写成双花括号', () => {
    expect(upgradePlaceholders('实施 @{planFile} 的 #{issueNumber}')).toBe('实施 @{{planFile}} 的 #{{issueNumber}}')
  })

  it('已经是双花括号的不再加层', () => {
    expect(upgradePlaceholders('{{issueNumber}}')).toBe('{{issueNumber}}')
  })

  it('名单外的花括号内容原样保留', () => {
    expect(upgradePlaceholders('{foo} {planfile} {"a":1}')).toBe('{foo} {planfile} {"a":1}')
  })
})

describe('composeBrainstormTemplate', () => {
  it('两份正文拼成条件分支，原型段落嵌进 prototypeRef 的位置', () => {
    const out = composeBrainstormTemplate({
      newIssue: '新建 {{userRequest}}',
      cont: '续聊 {{issueNumber}}\n\n{{prototypeRef}}\n\n收尾',
      proto: '原型 {{prototypeFile}}\n- id：{{prototypeSessionId}}',
    })
    expect(out).toBe([
      '{{#if issueNumber}}',
      '续聊 {{issueNumber}}',
      '',
      '{{#if prototypeFile}}',
      '原型 {{prototypeFile}}',
      '{{#if prototypeSessionId}}',
      '- id：{{prototypeSessionId}}',
      '{{/if}}',
      '{{/if}}',
      '',
      '收尾',
      '{{else}}',
      '新建 {{userRequest}}',
      '{{/if}}',
      '',
    ].join('\n'))
  })

  it('续聊正文里没有 prototypeRef 时原型段落接在末尾', () => {
    const out = composeBrainstormTemplate({ newIssue: '新建', cont: '续聊', proto: '原型 {{prototypeFile}}' })
    expect(out).toContain('续聊\n\n{{#if prototypeFile}}\n原型 {{prototypeFile}}\n{{/if}}')
  })

  it('没有原型段落时不留空的条件块', () => {
    const out = composeBrainstormTemplate({ newIssue: '新建', cont: '续聊\n\n{{prototypeRef}}', proto: '' })
    expect(out).not.toContain('prototypeFile')
    expect(out).not.toContain('prototypeRef')
  })
})

describe('splitIfBlock', () => {
  it('只认第一层的 else，内层条件块不当分界', () => {
    const branches = splitIfBlock(defaultBrainstorm, 'issueNumber')
    expect(branches!.then).toContain('/ecc:grilling')
    expect(branches!.then).toContain('{{#if prototypeFile}}')
    expect(branches!.else).toContain('opencli spx issue create')
    expect(branches!.else).not.toContain('{{else}}')
  })

  it('没有这个条件块时返回 null', () => {
    expect(splitIfBlock('普通模板', 'issueNumber')).toBeNull()
  })
})

describe('planPromptMigration', () => {
  const legacy = {
    brainstormPrompt: '建工单 {userRequest} nonce={nonce}',
    brainstormContinuePrompt: '讨论 {issueNumber}\n\n{prototypeRef}\n\n收尾',
    prototypeRefPrompt: '原型 {prototypeFile}\n- id：{prototypeSessionId}',
    implementPlanPrompt: '实施 @{planFile} #{issueNumber}',
    testPrompt: '验收 {issueNumber}（{prRef}）',
    reviewPrompt: '审查 #{prNumber}',
    prototypePrompt: '画原型 {issueNumber}',
    webhookPort: 17421,
  }

  it('五份存量提示词全部换成双花括号，并合并成一份头脑风暴模板', () => {
    const { blob, notes } = planPromptMigration(legacy, defaultBrainstorm)
    expect(blob).not.toBeNull()
    expect(blob!.implementPlanPrompt).toBe('实施 @{{planFile}} #{{issueNumber}}')
    expect(blob!.testPrompt).toBe('验收 {{issueNumber}}（{{prRef}}）')
    expect(blob!.reviewPrompt).toBe('审查 #{{prNumber}}')
    expect(blob!.prototypePrompt).toBe('画原型 {{issueNumber}}')
    expect(blob!.brainstormPrompt).toContain('{{#if issueNumber}}')
    expect(blob!.brainstormPrompt).toContain('{{#if prototypeFile}}')
    expect(blob!.brainstormPrompt).toContain('{{#if prototypeSessionId}}')
    expect(blob!.brainstormPrompt).toContain('{{else}}')
    expect(blob!.brainstormPrompt).toContain('建工单 {{userRequest}} nonce={{nonce}}')
    expect(notes.some(n => n.level === 'warn')).toBe(false)
  })

  it('被删掉的两个字段迁移后不再留在 settings 里，其他设置不动', () => {
    const { blob } = planPromptMigration(legacy, defaultBrainstorm)
    expect(blob!.brainstormContinuePrompt).toBeUndefined()
    expect(blob!.prototypeRefPrompt).toBeUndefined()
    expect(blob!.webhookPort).toBe(17421)
    expect(blob!.promptTemplateVersion).toBe(PROMPT_TEMPLATE_VERSION)
  })

  it('迁过一次就不再重复迁', () => {
    const { blob } = planPromptMigration(legacy, defaultBrainstorm)
    expect(planPromptMigration(blob!, defaultBrainstorm)).toEqual({ blob: null, notes: [] })
  })

  it('没存过任何提示词时什么都不做', () => {
    expect(planPromptMigration({ webhookPort: 17421 }, defaultBrainstorm)).toEqual({ blob: null, notes: [] })
  })

  it('只改过新建工单提示词时，续聊分支用内置默认补齐', () => {
    const { blob } = planPromptMigration(
      { brainstormPrompt: '建工单 {userRequest}', brainstormContinuePrompt: '' },
      defaultBrainstorm,
    )
    const merged = String(blob!.brainstormPrompt)
    expect(merged).toContain('建工单 {{userRequest}}')
    expect(merged).toContain('/ecc:grilling 讨论下 {{issueNumber}} 号工单')
    // 默认续聊分支自带原型段落，别再插第二份
    expect(merged.match(/\{\{#if prototypeFile\}\}/g)).toHaveLength(1)
  })

  it('只改过续聊提示词时，新建分支和原型段落用内置默认补齐', () => {
    const { blob } = planPromptMigration(
      { brainstormContinuePrompt: '讨论 {issueNumber}\n\n{prototypeRef}' },
      defaultBrainstorm,
    )
    const merged = String(blob!.brainstormPrompt)
    expect(merged).toContain('讨论 {{issueNumber}}')
    expect(merged).toContain('opencli spx issue create')
    expect(merged).toContain('工单已有原型插件 {{prototypeFile}}')
  })
})