import { afterEach, beforeEach, describe, expect, it } from 'vitest'

import {
  buildMigrationPatch,
  clearLegacyLocalStorage,
} from '@/lib/user-settings-migration'

beforeEach(() => {
  localStorage.clear()
})

afterEach(() => {
  localStorage.clear()
})

describe('buildMigrationPatch', () => {
  it('returns no data when nothing is stored', () => {
    const result = buildMigrationPatch()
    expect(result.hasData).toBe(false)
    expect(result.patch).toEqual({})
    expect(result.legacyKeys).toEqual([])
  })

  it('skips after marker is set', () => {
    localStorage.setItem('scrum4me:sprint_pb_filter_status', 'all')
    localStorage.setItem('scrum4me:settings_migrated', 'v1')
    const result = buildMigrationPatch()
    expect(result.hasData).toBe(false)
  })

  it('extracts sprint backlog prefs into nested patch', () => {
    localStorage.setItem('scrum4me:sprint_pb_filter_status', 'all')
    localStorage.setItem('scrum4me:sprint_pb_sort', 'priority')
    localStorage.setItem('scrum4me:sprint_pb_sort_dir', 'desc')
    localStorage.setItem('scrum4me:sprint_pb_collapsed', JSON.stringify(['pbi-1', 'pbi-2']))
    localStorage.setItem('scrum4me:sprint_pb_filter_popover_open', 'true')

    const result = buildMigrationPatch()

    expect(result.hasData).toBe(true)
    expect(result.patch.views?.sprintBacklog).toEqual({
      filterStatus: 'all',
      sort: 'priority',
      sortDir: 'desc',
      collapsedPbis: ['pbi-1', 'pbi-2'],
      filterPopoverOpen: true,
    })
    expect(result.legacyKeys).toContain('scrum4me:sprint_pb_filter_status')
    expect(result.legacyKeys).toContain('scrum4me:sprint_pb_collapsed')
  })

  it('extracts pbi-list prefs', () => {
    localStorage.setItem('scrum4me:pbi_sort', 'date')
    localStorage.setItem('scrum4me:pbi_filter_priority', '2')

    const result = buildMigrationPatch()
    expect(result.patch.views?.pbiList).toEqual({ sort: 'date', filterPriority: 2 })
  })

  it('extracts story_sort', () => {
    localStorage.setItem('scrum4me:story_sort', 'code')
    const result = buildMigrationPatch()
    expect(result.patch.views?.storyPanel).toEqual({ sort: 'code' })
  })

  it('extracts debug-mode', () => {
    localStorage.setItem('scrum4me:debug-mode', 'true')
    const result = buildMigrationPatch()
    expect(result.patch.devTools).toEqual({ debugMode: true })
  })

  it('extracts jobs-column dynamic prefixes from CSV values', () => {
    localStorage.setItem('queue_filter_kind', 'TASK_IMPLEMENTATION,SPRINT_IMPLEMENTATION')
    localStorage.setItem('queue_filter_status', 'queued,running')

    const result = buildMigrationPatch()
    expect(result.patch.views?.jobsColumns?.['queue']).toEqual({
      kinds: ['TASK_IMPLEMENTATION', 'SPRINT_IMPLEMENTATION'],
      statuses: ['queued', 'running'],
    })
  })

  it('ignores invalid enum values', () => {
    localStorage.setItem('scrum4me:sprint_pb_filter_status', 'BOGUS')
    const result = buildMigrationPatch()
    expect(result.hasData).toBe(false)
  })
})

describe('clearLegacyLocalStorage', () => {
  it('removes given keys and sets the marker', () => {
    localStorage.setItem('scrum4me:sprint_pb_sort', 'code')
    localStorage.setItem('scrum4me:pbi_sort', 'priority')

    clearLegacyLocalStorage(['scrum4me:sprint_pb_sort', 'scrum4me:pbi_sort'])

    expect(localStorage.getItem('scrum4me:sprint_pb_sort')).toBeNull()
    expect(localStorage.getItem('scrum4me:pbi_sort')).toBeNull()
    expect(localStorage.getItem('scrum4me:settings_migrated')).toBe('v1')
  })

  it('sets marker even with empty keys list (no-op migration)', () => {
    clearLegacyLocalStorage([])
    expect(localStorage.getItem('scrum4me:settings_migrated')).toBe('v1')
  })
})