/**
 * @vitest-environment node
 *
 * Converter unit tests for the table query builder. Cover the operator
 * round-trips — UI rule → Filter object → UI rule — with attention to the
 * valueless `$empty` operator that maps to two distinct UI operators.
 */
import { describe, expect, it } from 'vitest'
import { filterRulesToFilter, filterToRules } from '@/lib/table/query-builder/converters'
import type { FilterRule } from '@/lib/table/types'

function rule(overrides: Partial<FilterRule>): FilterRule {
  return {
    id: 'rule-1',
    logicalOperator: 'and',
    column: 'name',
    operator: 'eq',
    value: '',
    ...overrides,
  }
}

describe('filterRulesToFilter', () => {
  it('emits a bare value for eq (containment shorthand)', () => {
    expect(filterRulesToFilter([rule({ operator: 'eq', value: 'John' })])).toEqual({ name: 'John' })
  })

  it('wraps non-eq operators in a $-prefixed operator object', () => {
    expect(
      filterRulesToFilter([rule({ column: 'email', operator: 'startsWith', value: 'a' })])
    ).toEqual({ email: { $startsWith: 'a' } })
    expect(
      filterRulesToFilter([rule({ column: 'email', operator: 'ncontains', value: 'x' })])
    ).toEqual({ email: { $ncontains: 'x' } })
  })

  it('parses comma-separated values into arrays for in / nin', () => {
    expect(
      filterRulesToFilter([rule({ column: 'status', operator: 'nin', value: 'a, b' })])
    ).toEqual({ status: { $nin: ['a', 'b'] } })
  })

  it('serializes isEmpty / isNotEmpty to $empty without a value', () => {
    expect(filterRulesToFilter([rule({ column: 'phone', operator: 'isEmpty' })])).toEqual({
      phone: { $empty: true },
    })
    expect(filterRulesToFilter([rule({ column: 'phone', operator: 'isNotEmpty' })])).toEqual({
      phone: { $empty: false },
    })
  })

  it('merges two AND rules on the same column into one operator object', () => {
    const filter = filterRulesToFilter([
      rule({ id: 'a', column: 'age', operator: 'gt', value: '18' }),
      rule({ id: 'b', column: 'age', operator: 'lt', value: '65' }),
    ])
    expect(filter).toEqual({ age: { $gt: 18, $lt: 65 } })
  })

  it('normalizes a bare-equality shorthand when merging with an operator', () => {
    const filter = filterRulesToFilter([
      rule({ id: 'a', column: 'name', operator: 'eq', value: 'John' }),
      rule({ id: 'b', column: 'name', operator: 'contains', value: 'oh' }),
    ])
    expect(filter).toEqual({ name: { $eq: 'John', $contains: 'oh' } })
  })

  it('keeps same-column rules across an OR boundary in separate groups', () => {
    const filter = filterRulesToFilter([
      rule({ id: 'a', column: 'age', operator: 'gt', value: '18' }),
      rule({ id: 'b', logicalOperator: 'or', column: 'age', operator: 'lt', value: '5' }),
    ])
    expect(filter).toEqual({ $or: [{ age: { $gt: 18 } }, { age: { $lt: 5 } }] })
  })
})

describe('filterToRules', () => {
  it('maps $empty: true back to isEmpty and $empty: false back to isNotEmpty', () => {
    const empty = filterToRules({ phone: { $empty: true } })
    expect(empty).toHaveLength(1)
    expect(empty[0]).toMatchObject({ column: 'phone', operator: 'isEmpty', value: '' })

    const notEmpty = filterToRules({ phone: { $empty: false } })
    expect(notEmpty[0]).toMatchObject({ column: 'phone', operator: 'isNotEmpty', value: '' })
  })

  it("treats the string '$empty' operand the same as the boolean (no predicate flip)", () => {
    const empty = filterToRules({ phone: { $empty: 'true' } } as unknown as Parameters<
      typeof filterToRules
    >[0])
    expect(empty[0]).toMatchObject({ column: 'phone', operator: 'isEmpty', value: '' })

    const notEmpty = filterToRules({ phone: { $empty: 'false' } } as unknown as Parameters<
      typeof filterToRules
    >[0])
    expect(notEmpty[0]).toMatchObject({ column: 'phone', operator: 'isNotEmpty', value: '' })
  })

  it('round-trips string-pattern operators', () => {
    for (const operator of ['contains', 'ncontains', 'startsWith', 'endsWith'] as const) {
      const filter = filterRulesToFilter([rule({ column: 'name', operator, value: 'abc' })])
      const back = filterToRules(filter)
      expect(back[0]).toMatchObject({ column: 'name', operator, value: 'abc' })
    }
  })

  it('round-trips isEmpty through filterRulesToFilter', () => {
    const filter = filterRulesToFilter([rule({ column: 'name', operator: 'isEmpty' })])
    const back = filterToRules(filter)
    expect(back[0]).toMatchObject({ column: 'name', operator: 'isEmpty', value: '' })
  })

  it('round-trips a multi-operator column (Filter → rules → Filter) without loss', () => {
    const original = { age: { $gte: 18, $lte: 65 } }
    const rules = filterToRules(original)
    expect(rules).toHaveLength(2)
    expect(filterRulesToFilter(rules)).toEqual(original)
  })
})