import { describe, it } from 'mocha';
import * as chai from 'chai';
import chaiAsPromised from 'chai-as-promised';
import fc from 'fast-check';
import * as Version from '../../../main/ts/core/Version';
import { Comparison } from '../../../main/ts/utils/Comparison';

const assert = chai.use(chaiAsPromised).assert;

const mmThrowMessage = 'Could not parse major.minor version string';

const smallNat = fc.nat(200);

const smallNatString = smallNat.map(String);

describe('Version', () => {
  describe('parseVersion', () => {
    it('parses a correct 3-point version', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, smallNat, async (major, minor, patch) => {
        const input = `${major}.${minor}.${patch}`;
        const expected = { major, minor, patch, preRelease: undefined, buildMetaData: undefined };
        await assert.becomes(Version.parseVersion(input), expected);
      }));
    });

    it('fails on 2-point versions', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, async (major, minor) => {
        const input = `${major}.${minor}`;
        await assert.isRejected(Version.parseVersion(input), 'Could not parse version string');
      }));
    });

    it('parses a correct 3-point version with preRelease', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, smallNat, smallNat, async (major, minor, patch, preRelease) => {
        const input = `${major}.${minor}.${patch}-${preRelease}`;
        const expected = { major, minor, patch, preRelease: String(preRelease), buildMetaData: undefined };
        await assert.becomes(Version.parseVersion(input), expected);
      }));
    });

    it('parses a correct 3-point version with buildmeta', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, smallNat, fc.integer({ min: 1, max: 100 }), async (major, minor, patch, buildMetaData) => {
        const input = `${major}.${minor}.${patch}+${buildMetaData}`;
        const actual = Version.parseVersion(input);
        const expected = { major, minor, patch, preRelease: undefined, buildMetaData: String(buildMetaData) };
        await assert.becomes(actual, expected);
      }));
    });
  });

  const invalid2Points = [
    '1.2.3',
    'cat.3',
    '',
    'dog',
    'dog.frog',
    '-1.0'
  ];

  describe('parseMajorMinorVersion', () => {
    it('parses 2-point version', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, async (major, minor) => {
        await assert.becomes(Version.parseMajorMinorVersion(`${major}.${minor}`), { major, minor });
      }));
    });

    it('fails for invalid input (manual cases)', async () => {
      for (const x of invalid2Points) {
        await assert.isRejected(Version.parseMajorMinorVersion(x), mmThrowMessage);
      }
    });
  });

  describe('majorMinorVersionToString', () => {
    it('round-trips', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, async (major, minor) => {
        const s = `${major}.${minor}`;
        const v = await Version.parseMajorMinorVersion(s);
        assert.deepEqual(Version.majorMinorVersionToString(v), s);
      }));
    });
  });

  describe('versionToString', () => {
    it('round-trips for 3-point version', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, smallNat, async (major, minor, patch) => {
        const sVersion = `${major}.${minor}.${patch}`;
        const version = await Version.parseVersion(sVersion);
        const actual = Version.versionToString(version);
        assert.deepEqual(actual, sVersion);
      }));
    });

    it('round-trips for version with prerelease', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, smallNat, smallNatString,
        async (major, minor, patch, preRelease) => {
          const input = `${major}.${minor}.${patch}-${preRelease}`;
          const version = await Version.parseVersion(input);
          const actual = Version.versionToString(version);
          assert.deepEqual(actual, input);
        }
      ));
    });

    it('round-trips for version with buildmeta', async () => {
      await fc.assert(fc.asyncProperty(smallNat, smallNat, smallNat, smallNatString,
        async (major, minor, patch, buildMetaData) => {
          const input = `${major}.${minor}.${patch}+${buildMetaData}`;
          const version = await Version.parseVersion(input);
          const actual = Version.versionToString(version);
          assert.deepEqual(actual, input);
        }
      ));
    });
  });

  describe('compareVersions', () => {
    it('is reflexive for 3-point versions', () => {
      fc.assert(fc.property(fc.integer(), fc.integer(), fc.integer(), (major, minor, patch) => {
        assert.equal(Version.compareVersions({ major, minor, patch }, { major, minor, patch }), Comparison.EQ);
      }));
    });

    it('is reflexive for 3-point versions with prerelease', () => {
      fc.assert(fc.property(fc.integer(), fc.integer(), fc.integer(), fc.hexaString(), (major, minor, patch, preRelease) => {
        assert.equal(Version.compareVersions({ major, minor, patch, preRelease }, { major, minor, patch, preRelease }), Comparison.EQ);
      }));
    });

    it('considers preRelease versions lower less than release versions of the same 3-point version', () => {
      fc.assert(fc.property(fc.integer(), fc.integer(), fc.integer(), fc.hexaString(), (major, minor, patch, preRelease) => {
        assert.equal(Version.compareVersions({ major, minor, patch, preRelease }, { major, minor, patch }), Comparison.LT);
        assert.equal(Version.compareVersions({ major, minor, patch }, { major, minor, patch, preRelease }), Comparison.GT);
      }));
    });

    it('compares major versions', () => {
      fc.assert(fc.property(fc.integer({ min: 0, max: 1000 }), fc.integer(), fc.integer(), fc.integer(), fc.integer(), fc.hexaString(), fc.hexaString(),
        (major, minor1, minor2, patch1, patch2, preRelease1, preRelease2) => {
          assert.equal(Version.compareVersions(
            { major, minor: minor1, patch: patch1, preRelease: preRelease1 },
            { major: major + 1, minor: minor2, patch: patch2, preRelease: preRelease2 }
          ), Comparison.LT);

          assert.equal(Version.compareVersions(
            { major: major + 1, minor: minor2, patch: patch2, preRelease: preRelease2 },
            { major, minor: minor1, patch: patch1, preRelease: preRelease1 }
          ), Comparison.GT);
        }));
    });

    it('compares minor versions', () => {
      fc.assert(fc.property(fc.integer(), fc.integer({ min: 0, max: 1000 }), fc.integer(), fc.integer(), fc.hexaString(), fc.hexaString(),
        (major, minor, patch1, patch2, preRelease1, preRelease2) => {
          assert.equal(Version.compareVersions(
            { major, minor, patch: patch1, preRelease: preRelease1 },
            { major, minor: minor + 1, patch: patch2, preRelease: preRelease2 }
          ), Comparison.LT);
          assert.equal(Version.compareVersions(
            { major, minor: minor + 1, patch: patch2, preRelease: preRelease2 },
            { major, minor, patch: patch1, preRelease: preRelease1 }
          ), Comparison.GT);
        }));
    });

    it('compares patch versions', () => {
      fc.assert(fc.property(fc.integer(), fc.integer(), fc.integer({ min: 0, max: 1000 }), fc.hexaString(), fc.hexaString(),
        (major, minor, patch, preRelease1, preRelease2) => {
          assert.equal(Version.compareVersions(
            { major, minor, patch, preRelease: preRelease1 },
            { major, minor, patch: patch + 1, preRelease: preRelease2 }
          ), Comparison.LT);
          assert.equal(Version.compareVersions(
            { major, minor, patch: patch + 1, preRelease: preRelease2 },
            { major, minor, patch, preRelease: preRelease1 }
          ), Comparison.GT);
        }));
    });
  });
});