import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import {
  clearListStates,
  LIST_STATE_PREFIX,
  listStateOwner,
  listStateOwnerPrefix,
  readListState,
  setListStateOwner,
  writeListState,
} from '../../src/state/listState'
import { SIDEBAR_KEY } from '../../src/state/useSidebar'

// Browser-storage helpers of the per-list query memory (D-01), scoped to the
// signed-in admin (WR-03, T-16.1-03).
const ID = 'acme.demo.widgets'
const OWNER = 7
const KEY = `${LIST_STATE_PREFIX}${OWNER}:${ID}`

beforeEach(() => {
  window.localStorage.clear()
  setListStateOwner(OWNER)
})

afterEach(() => {
  vi.restoreAllMocks()
  setListStateOwner(null)
  window.localStorage.clear()
})

describe('list state keys', () => {
  it('uses the summer-admin.list: prefix plus the admin id and the controller id, one key per list', () => {
    expect(LIST_STATE_PREFIX).toBe('summer-admin.list:')
    expect(listStateOwnerPrefix(OWNER)).toBe('summer-admin.list:7:')
    writeListState(ID, { search: 'blue' })
    writeListState('acme.demo.gadgets', { sort: 'name', dir: 'asc' })
    expect(Object.keys(window.localStorage).sort()).toEqual([
      'summer-admin.list:7:acme.demo.gadgets',
      'summer-admin.list:7:acme.demo.widgets',
    ])
    expect(JSON.parse(window.localStorage.getItem(KEY)!)).toEqual({ search: 'blue' })
    expect(readListState('acme.demo.gadgets')).toEqual({ sort: 'name', dir: 'asc' })
  })

  it('reads a missing key as the empty query', () => {
    expect(readListState(ID)).toEqual({})
    expect(window.localStorage.getItem(KEY)).toBeNull()
  })
})

describe('readListState', () => {
  it.each([
    ['invalid JSON', '{"search": '],
    ['a JSON string', '"search=blue"'],
    ['a JSON number', '42'],
    ['JSON null', 'null'],
    ['an array', '["search", "blue"]'],
    ['an object with a number value', '{"search": "blue", "page": 2}'],
    ['an object with a nested object', '{"filter": {"active": "true"}}'],
    ['an object with a boolean value', '{"filter[active]": true}'],
  ])('returns the empty query for %s and removes the key', (_label, raw) => {
    window.localStorage.setItem(KEY, raw)
    expect(readListState(ID)).toEqual({})
    expect(window.localStorage.getItem(KEY)).toBeNull()
  })

  it('drops malformed values through the strict parser like a hand-edited URL', () => {
    window.localStorage.setItem(
      KEY,
      JSON.stringify({
        search: '   ',
        dir: 'sideways',
        page: '0',
        per_page: 'many',
        'filter[active]': '',
        'filter[maker]': '3',
        unknown: 'value',
        'filter[': 'x',
      }),
    )
    expect(readListState(ID)).toEqual({ filter: { maker: '3' } })
  })

  it('reads an unknown direction next to a sort as ascending', () => {
    window.localStorage.setItem(KEY, JSON.stringify({ sort: 'code', dir: 'sideways' }))
    expect(readListState(ID)).toEqual({ sort: 'code', dir: 'asc' })
  })

  it('keeps a well-formed stored object of strings in place', () => {
    window.localStorage.setItem(KEY, JSON.stringify({ search: 'blue', page: '3' }))
    expect(readListState(ID)).toEqual({ search: 'blue', page: 3 })
    expect(window.localStorage.getItem(KEY)).not.toBeNull()
  })
})

describe('writeListState', () => {
  it('round-trips search, sort, dir, a page above 1, per_page and filters', () => {
    const query = {
      search: 'blue',
      sort: 'code',
      dir: 'desc' as const,
      page: 3,
      per_page: 50,
      filter: { active: 'true', maker: '7' },
    }
    writeListState(ID, query)
    expect(JSON.parse(window.localStorage.getItem(KEY)!)).toEqual({
      search: 'blue',
      sort: 'code',
      dir: 'desc',
      page: '3',
      per_page: '50',
      'filter[active]': 'true',
      'filter[maker]': '7',
    })
    expect(readListState(ID)).toEqual(query)
  })

  it('stores the first page as no page', () => {
    writeListState(ID, { sort: 'name', dir: 'asc', page: 1 })
    expect(readListState(ID)).toEqual({ sort: 'name', dir: 'asc' })
  })

  it.each([
    ['the empty query', {}],
    ['a query of empty filter values', { filter: { active: '' } }],
    ['a first page only', { page: 1 }],
  ])('removes the key for %s instead of storing it', (_label, query) => {
    writeListState(ID, { search: 'blue' })
    expect(window.localStorage.getItem(KEY)).not.toBeNull()
    writeListState(ID, query)
    expect(window.localStorage.getItem(KEY)).toBeNull()
    expect(Object.keys(window.localStorage)).toEqual([])
  })
})

describe('list state owner', () => {
  const OTHER_KEY = `${LIST_STATE_PREFIX}8:${ID}`
  const LEGACY_KEY = `${LIST_STATE_PREFIX}${ID}`

  it('keeps the owner as a string and null when signed out', () => {
    expect(listStateOwner()).toBe('7')
    setListStateOwner(null)
    expect(listStateOwner()).toBeNull()
    setListStateOwner('')
    expect(listStateOwner()).toBeNull()
  })

  it("never reads another admin's query and removes it when the owner changes", () => {
    writeListState(ID, { search: 'jan.kowalski@example.test' })
    setListStateOwner(8)
    expect(window.localStorage.getItem(KEY)).toBeNull()
    expect(readListState(ID)).toEqual({})
    writeListState(ID, { sort: 'name', dir: 'asc' })
    expect(Object.keys(window.localStorage)).toEqual([OTHER_KEY])
  })

  it("does not read another admin's key even before any sweep", () => {
    window.localStorage.setItem(OTHER_KEY, JSON.stringify({ search: 'theirs' }))
    expect(readListState(ID)).toEqual({})
    expect(window.localStorage.getItem(OTHER_KEY)).not.toBeNull()
  })

  it("keeps the owner's own keys when the same owner is set again", () => {
    writeListState(ID, { search: 'blue' })
    setListStateOwner('7')
    expect(readListState(ID)).toEqual({ search: 'blue' })
  })

  it('sweeps the unscoped keys of older builds and never reads them', () => {
    window.localStorage.setItem(LEGACY_KEY, JSON.stringify({ search: 'legacy' }))
    window.localStorage.setItem(`${LIST_STATE_PREFIX}acme.demo.gadgets`, JSON.stringify({ sort: 'name' }))
    window.localStorage.setItem(SIDEBAR_KEY, 'true')
    expect(readListState(ID)).toEqual({})
    setListStateOwner(OWNER)
    expect(Object.keys(window.localStorage)).toEqual([SIDEBAR_KEY])
  })

  it('does not take an admin id that only starts with the owner id for the owner', () => {
    window.localStorage.setItem(`${LIST_STATE_PREFIX}70:${ID}`, JSON.stringify({ search: 'seventy' }))
    writeListState(ID, { search: 'seven' })
    setListStateOwner(OWNER)
    expect(Object.keys(window.localStorage)).toEqual([KEY])
  })

  it('removes every list key and reads and writes nothing once signed out', () => {
    window.localStorage.setItem(SIDEBAR_KEY, 'true')
    window.localStorage.setItem(OTHER_KEY, JSON.stringify({ search: 'theirs' }))
    window.localStorage.setItem(LEGACY_KEY, JSON.stringify({ search: 'legacy' }))
    writeListState(ID, { search: 'blue' })
    setListStateOwner(null)
    expect(Object.keys(window.localStorage)).toEqual([SIDEBAR_KEY])
    writeListState(ID, { search: 'blue' })
    expect(Object.keys(window.localStorage)).toEqual([SIDEBAR_KEY])
    window.localStorage.setItem(KEY, JSON.stringify({ search: 'planted' }))
    expect(readListState(ID)).toEqual({})
  })
})

describe('clearListStates', () => {
  it('removes every list key and keeps the sidebar preference and other keys', () => {
    window.localStorage.setItem(SIDEBAR_KEY, 'true')
    window.localStorage.setItem('unrelated', 'kept')
    writeListState(ID, { search: 'blue' })
    writeListState('acme.demo.gadgets', { sort: 'name', dir: 'desc' })
    writeListState('acme.other.people', { filter: { active: 'true' } })
    window.localStorage.setItem(`${LIST_STATE_PREFIX}8:${ID}`, JSON.stringify({ search: 'theirs' }))
    window.localStorage.setItem(`${LIST_STATE_PREFIX}${ID}`, JSON.stringify({ search: 'legacy' }))
    clearListStates()
    expect(Object.keys(window.localStorage).sort()).toEqual(['summer-admin.sidebar', 'unrelated'])
    expect(window.localStorage.getItem(SIDEBAR_KEY)).toBe('true')
  })

  it('is a no-op on empty storage', () => {
    expect(() => clearListStates()).not.toThrow()
    expect(Object.keys(window.localStorage)).toEqual([])
  })
})

describe('storage that throws', () => {
  it('reads the empty query and writes and clears without throwing', () => {
    vi.spyOn(Storage.prototype, 'getItem').mockImplementation(() => {
      throw new DOMException('denied', 'SecurityError')
    })
    vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
      throw new DOMException('full', 'QuotaExceededError')
    })
    vi.spyOn(Storage.prototype, 'removeItem').mockImplementation(() => {
      throw new DOMException('denied', 'SecurityError')
    })
    vi.spyOn(Storage.prototype, 'key').mockImplementation(() => {
      throw new DOMException('denied', 'SecurityError')
    })
    expect(readListState(ID)).toEqual({})
    expect(() => writeListState(ID, { search: 'blue' })).not.toThrow()
    expect(() => writeListState(ID, {})).not.toThrow()
    expect(() => clearListStates()).not.toThrow()
    expect(() => setListStateOwner(8)).not.toThrow()
    expect(() => setListStateOwner(null)).not.toThrow()
  })

  it('drops a malformed value even when the removal throws', () => {
    window.localStorage.setItem(KEY, '{broken')
    vi.spyOn(Storage.prototype, 'removeItem').mockImplementation(() => {
      throw new DOMException('denied', 'SecurityError')
    })
    expect(readListState(ID)).toEqual({})
  })

  it('treats a window whose localStorage getter throws as no storage', () => {
    vi.spyOn(window, 'localStorage', 'get').mockImplementation(() => {
      throw new DOMException('denied', 'SecurityError')
    })
    expect(readListState(ID)).toEqual({})
    expect(() => writeListState(ID, { search: 'blue' })).not.toThrow()
    expect(() => writeListState(ID, {})).not.toThrow()
    expect(() => clearListStates()).not.toThrow()
    expect(() => setListStateOwner(8)).not.toThrow()
  })
})