const assert = require('assert');
const UnicodeTrieBuilder = require('../builder');
const UnicodeTrie = require('../');

describe('unicode trie', () => {
  it('set', () => {
    const trie = new UnicodeTrieBuilder(10, 666);
    trie.set(0x4567, 99);
    assert.equal(trie.get(0x4566), 10);
    assert.equal(trie.get(0x4567), 99);
    assert.equal(trie.get(-1), 666);
    assert.equal(trie.get(0x110000), 666);
  });

  it('set -> compacted trie', () => {
    const t = new UnicodeTrieBuilder(10, 666);
    t.set(0x4567, 99);

    const trie = t.freeze();
    assert.equal(trie.get(0x4566), 10);
    assert.equal(trie.get(0x4567), 99);
    assert.equal(trie.get(-1), 666);
    assert.equal(trie.get(0x110000), 666);
  });

  it('setRange', () => {
    const trie = new UnicodeTrieBuilder(10, 666);
    trie.setRange(13, 6666, 7788, false);
    trie.setRange(6000, 7000, 9900, true);

    assert.equal(trie.get(12), 10);
    assert.equal(trie.get(13), 7788);
    assert.equal(trie.get(5999), 7788);
    assert.equal(trie.get(6000), 9900);
    assert.equal(trie.get(7000), 9900);
    assert.equal(trie.get(7001), 10);
    assert.equal(trie.get(0x110000), 666);
  });

  it('setRange -> compacted trie', () => {
    const t = new UnicodeTrieBuilder(10, 666);
    t.setRange(13, 6666, 7788, false);
    t.setRange(6000, 7000, 9900, true);

    const trie = t.freeze();
    assert.equal(trie.get(12), 10);
    assert.equal(trie.get(13), 7788);
    assert.equal(trie.get(5999), 7788);
    assert.equal(trie.get(6000), 9900);
    assert.equal(trie.get(7000), 9900);
    assert.equal(trie.get(7001), 10);
    assert.equal(trie.get(0x110000), 666);
  });

  it('toBuffer written in little-endian', () => {
    const trie = new UnicodeTrieBuilder();
    trie.set(0x4567, 99);

    const buf = trie.toBuffer();
    const bufferExpected = new Buffer.from([0, 72, 0, 0, 0, 0, 0, 0, 128, 36, 0, 0, 123, 123, 206, 144, 235, 128, 2, 143, 67, 96, 225, 171, 23, 55, 54, 38, 231, 47, 44, 127, 233, 90, 109, 194, 92, 246, 126, 197, 131, 223, 31, 56, 102, 78, 154, 20, 108, 117, 88, 244, 93, 192, 190, 218, 229, 156, 12, 107, 86, 235, 125, 96, 102, 0, 129, 15, 239, 109, 219, 204, 58, 151, 92, 52, 126, 152, 198, 14, 0]);
    assert.equal(buf.toString('hex'), bufferExpected.toString('hex'));
  });

  it('should work with compressed serialization format', () => {
    const t = new UnicodeTrieBuilder(10, 666);
    t.setRange(13, 6666, 7788, false);
    t.setRange(6000, 7000, 9900, true);

    const buf = t.toBuffer();
    const trie = new UnicodeTrie(buf);
    assert.equal(trie.get(12), 10);
    assert.equal(trie.get(13), 7788);
    assert.equal(trie.get(5999), 7788);
    assert.equal(trie.get(6000), 9900);
    assert.equal(trie.get(7000), 9900);
    assert.equal(trie.get(7001), 10);
    assert.equal(trie.get(0x110000), 666);
  });

  const rangeTests = [
    {
      ranges: [
         [ 0,        0,        0,      0 ],
         [ 0,        0x40,     0,      0 ],
         [ 0x40,     0xe7,     0x1234, 0 ],
         [ 0xe7,     0x3400,   0,      0 ],
         [ 0x3400,   0x9fa6,   0x6162, 0 ],
         [ 0x9fa6,   0xda9e,   0x3132, 0 ],
         [ 0xdada,   0xeeee,   0x87ff, 0 ],
         [ 0xeeee,   0x11111,  1,      0 ],
         [ 0x11111,  0x44444,  0x6162, 0 ],
         [ 0x44444,  0x60003,  0,      0 ],
         [ 0xf0003,  0xf0004,  0xf,    0 ],
         [ 0xf0004,  0xf0006,  0x10,   0 ],
         [ 0xf0006,  0xf0007,  0x11,   0 ],
         [ 0xf0007,  0xf0040,  0x12,   0 ],
         [ 0xf0040,  0x110000, 0,      0 ]
      ],

      check: [
        [ 0,        0      ],
        [ 0x40,     0      ],
        [ 0xe7,     0x1234 ],
        [ 0x3400,   0      ],
        [ 0x9fa6,   0x6162 ],
        [ 0xda9e,   0x3132 ],
        [ 0xdada,   0      ],
        [ 0xeeee,   0x87ff ],
        [ 0x11111,  1      ],
        [ 0x44444,  0x6162 ],
        [ 0xf0003,  0      ],
        [ 0xf0004,  0xf    ],
        [ 0xf0006,  0x10   ],
        [ 0xf0007,  0x11   ],
        [ 0xf0040,  0x12   ],
        [ 0x110000, 0      ]
      ]
    },
    {
      // set some interesting overlapping ranges
      ranges: [
        [ 0,        0,        0,      0 ],
        [ 0x21,     0x7f,     0x5555, 1 ],
        [ 0x2f800,  0x2fedc,  0x7a,   1 ],
        [ 0x72,     0xdd,     3,      1 ],
        [ 0xdd,     0xde,     4,      0 ],
        [ 0x201,    0x240,    6,      1 ],  // 3 consecutive blocks with the same pattern but
        [ 0x241,    0x280,    6,      1 ],  // discontiguous value ranges, testing utrie2_enum()
        [ 0x281,    0x2c0,    6,      1 ],
        [ 0x2f987,  0x2fa98,  5,      1 ],
        [ 0x2f777,  0x2f883,  0,      1 ],
        [ 0x2f900,  0x2ffaa,  1,      0 ],
        [ 0x2ffaa,  0x2ffab,  2,      1 ],
        [ 0x2ffbb,  0x2ffc0,  7,      1 ]
      ],

      check: [
        [ 0,        0      ],
        [ 0x21,     0      ],
        [ 0x72,     0x5555 ],
        [ 0xdd,     3      ],
        [ 0xde,     4      ],
        [ 0x201,    0      ],
        [ 0x240,    6      ],
        [ 0x241,    0      ],
        [ 0x280,    6      ],
        [ 0x281,    0      ],
        [ 0x2c0,    6      ],
        [ 0x2f883,  0      ],
        [ 0x2f987,  0x7a   ],
        [ 0x2fa98,  5      ],
        [ 0x2fedc,  0x7a   ],
        [ 0x2ffaa,  1      ],
        [ 0x2ffab,  2      ],
        [ 0x2ffbb,  0      ],
        [ 0x2ffc0,  7      ],
        [ 0x110000, 0      ]
      ]
    },
    {
      // use a non-zero initial value
      ranges: [
        [ 0,        0,        9, 0 ], // non-zero initial value.
        [ 0x31,     0xa4,     1, 0 ],
        [ 0x3400,   0x6789,   2, 0 ],
        [ 0x8000,   0x89ab,   9, 1 ],
        [ 0x9000,   0xa000,   4, 1 ],
        [ 0xabcd,   0xbcde,   3, 1 ],
        [ 0x55555,  0x110000, 6, 1 ], // highStart<U+ffff with non-initialValue
        [ 0xcccc,   0x55555,  6, 1 ]
      ],

      check: [
        [ 0,        9 ],  // non-zero initialValue
        [ 0x31,     9 ],
        [ 0xa4,     1 ],
        [ 0x3400,   9 ],
        [ 0x6789,   2 ],
        [ 0x9000,   9 ],
        [ 0xa000,   4 ],
        [ 0xabcd,   9 ],
        [ 0xbcde,   3 ],
        [ 0xcccc,   9 ],
        [ 0x110000, 6 ]
      ]
    },
    {
      // empty or single-value tries, testing highStart==0
      ranges: [
        [ 0,        0,        3, 0 ] // Only the element with the initial value.
      ],

      check: [
        [ 0,        3 ],
        [ 0x110000, 3 ]
      ]
    },
    {
      ranges: [
        [ 0,        0,        3,  0 ], // Initial value = 3
        [ 0,        0x110000, 5, 1  ]
      ],

      check: [
        [ 0,        3 ],
        [ 0x110000, 5 ]
      ]
    }
  ];

  it('should pass range tests', () => {
    const result = [];
    for (let test of rangeTests) {
      let initialValue = 0;
      let errorValue = 0x0bad;
      let i = 0;
      if (test.ranges[i][1] < 0) {
        errorValue = test.ranges[i][2];
        i++;
      }

      initialValue = test.ranges[i++][2];
      var trie = new UnicodeTrieBuilder(initialValue, errorValue);

      for (let range of test.ranges.slice(i)) {
        trie.setRange(range[0], range[1] - 1, range[2], range[3] !== 0);
      }

      var frozen = trie.freeze();

      var start = 0;
      result.push(test.check.map((check) => {
        let end;
        const result1 = [];
        for (start = start, end = check[0]; start < end; start++) {
          assert.equal(trie.get(start), check[1]);
          result1.push(assert.equal(frozen.get(start), check[1]));
        }
        return result1;
      }));
    }
  });
});