import { describe, expect, test } from 'vitest'
import { List } from '../../src/List'
import { Vector } from '../../src/Vector'

function seqEquArray(seq, arr) {
  if (seq.size() != Array.from(arr).length) {
    return false
  }
  let it = seq.begin(), it_end = seq.end(), idx = 0
  while (it.neq(it_end)) {
    if (arr[idx] !== it.value) {
      return false
    }
    idx++
    it.inc()
  }
  return true
}

for (const Type of [List, Vector]) {
  describe(Type.name, () => {
    test('from', () => {
      expect(seqEquArray(Type.from([]), [])).toBeTruthy()
      expect(seqEquArray(Type.from([1, 2, 3]), [1, 2, 3])).toBeTruthy()
      {
        const seq = Type.from([1, 2, 3])
        const seq2 = Type.from(seq)
        seq.clear()
        expect(seqEquArray(seq2, [1, 2, 3]))
      }
      {
        const iterable = {
          [Symbol.iterator]: () => {
            let i = 2;
            return {
              next: () => {
                return {
                  done: i == 0,
                  value: i--,
                }
              }
            }
          }
        }
        expect(seqEquArray(Type.from(iterable), [2, 1])).toBeTruthy()
      }
    })

    test('copy, clone', () => {
      const seq = Type.from([1, 2, 3])
      const a = new Type(), b = seq.clone()
      a.copy(seq)
      expect(a.size()).toEqual(3)
      expect(b.size()).toEqual(3)
      seq.clear()
      expect(a.size()).toEqual(3)
      expect(b.size()).toEqual(3)
    })

    test('move, empty', () => {
      const a = Type.from([1, 2, 3])
      const b = new Type()
      b.move(a)
      expect(b.size()).toEqual(3)
    })

    test('constructor, assign', () => {
      expect(new Type().size()).toEqual(0)
      expect(() => new Type().back).toThrow()
      expect(() => new Type().front).toThrow()
      expect(seqEquArray(new Type(null), [null])).toBeTruthy()
      expect(seqEquArray(new Type(null, 2), [null, null])).toBeTruthy()
      {
        const seq = Type.from([1, 2, 3])
        expect(seqEquArray(new Type(seq.begin().inc(), seq.end().dec()), [2])).toBeTruthy()
        seq.assign(10)
        expect(seq.size()).toEqual(1)
      }
    })

    test('resize', () => {
      {
        const seq = Type.from([1, 2, 3])
        seq.resize(1)
        expect(seqEquArray(seq, [1])).toBeTruthy()
      }
      {
        const seq = Type.from([1])
        seq.resize(3, 2)
        expect(seqEquArray(seq, [1, 2, 2])).toBeTruthy()
      }
    })

    test('insert, clone', () => {
      {
        const seq = Type.from([1, 2])
        expect(() => seq.insert(seq.begin(), undefined)).toThrow()
      }
      {
        const seq = Type.from([1, 2])
        const it = seq.insert(seq.begin().inc(), null, 2)
        expect(seqEquArray(seq, [1, null, null, 2])).toBeTruthy()
        expect(seq.size()).toEqual(4)
        expect(it.eq(seq.begin().inc())).toBeTruthy()
      }
      {
        const a = Type.from([1, 4])
        const b = Type.from([2, 3])
        const it = a.insert(a.begin().inc(), b.begin(), b.end())
        expect(seqEquArray(a, [1, 2, 3, 4])).toBeTruthy()
        expect(a.size()).toEqual(4)
        expect(it.eq(a.begin().inc())).toBeTruthy()
      }
      {
        const seq = Type.from([1, 2])
        expect(() => seq.insert()).toThrowError()
        const it = seq.insert(seq.begin(), 0, 0)
        expect(it.eq(seq.begin())).toBeTruthy()
      }
    })

    test('erase, clear', () => {
      {
        const seq = Type.from([1, 2, 3, 4])
        const it = seq.erase(seq.begin(), seq.end().dec().dec())
        expect(seqEquArray(seq, [3, 4])).toBeTruthy()
        expect(seq.size()).toEqual(2)
        expect(it.eq(seq.begin())).toBeTruthy()
      }
      {
        const seq = Type.from([1, 2, 3])
        const it = seq.erase(seq.begin().inc())
        expect(seqEquArray(seq, [1, 3])).toBeTruthy()
        expect(seq.size()).toEqual(2)
        expect(it.deref()).toEqual(seq.begin().inc().deref())
      }
      {
        const seq = Type.from([1, 2])
        seq.clear()
        expect(seq.size()).toEqual(0)
      }
    })

    test('pushBack, pushFront, popBack, popFront, back, front', () => {
      const seq = Type.from([1, 2, 3])
      seq.popFront()
      seq.pushFront(5)
      seq.popBack()
      seq.popBack()
      seq.pushBack(10)
      expect(seqEquArray(seq, [5, 10])).toBeTruthy()
      expect(seq.front).toEqual(5)
      expect(seq.back).toEqual(10)
      seq.front = 1
      seq.back = 2
      expect(seq.front).toEqual(1)
      expect(seq.back).toEqual(2)
    })

    test('toJSON, toString', () => {
      expect(Type.from([1, 2]).toJSON()).toEqual('[ 1, 2 ]')
      expect(Type.from([0n]).toString()).toEqual('[ 0 ]')
    })
  })

  describe(Type.name + 'Iterator', () => {
    test('copy', () => {
      const seq = Type.from([1, 2, 3])
      const it1 = seq.begin()
      const it2 = seq.end()
      it2.copy(it1)
      it1.inc()
      expect(it2.deref()).toEqual(seq.begin().deref())
    })
  })
}