const t = require('tap')

const OverrideSet = require('../lib/override-set.js')

t.test('constructor', async (t) => {
  t.test('throws when adding a child rule with no name', async (t) => {
    t.throws(() => {
      new OverrideSet({
        overrides: {
          'github:npm/cli': '1.0.0',
        },
      })
    }, 'Override without name: github:npm/cli', 'threw error')
  })

  t.test('loads overrides', async (t) => {
    const overrides = new OverrideSet({
      overrides: {
        'a@1': { '.': '1.0.2' },
        b: { '.': '1.0.0' },
        'c@1.0.1': { '.': '1.0.2' },
      },
    })

    t.ok(overrides.children.has('a@1'), 'created child for a@1')
    t.ok(overrides.children.has('b'), 'created child for b')

    const missingEdgeRule = overrides.getEdgeRule({ name: 'a', spec: '^2.0.0' })
    t.equal(missingEdgeRule, overrides, 'unmatched edge returns root rules')

    const edgeRuleA = overrides.getEdgeRule({ name: 'a', spec: '^1.0.1' })
    t.ok(edgeRuleA, 'found a rule for a matching edge for a@1')
    const edgeRuleB = overrides.getEdgeRule({ name: 'b', spec: '^1.1.0' })
    t.ok(edgeRuleB, 'found a rule for a matching edge for b')
    const edgeRuleC = overrides.getEdgeRule({ name: 'c', spec: '^1.0.0' })
    t.ok(edgeRuleC, 'returned a rule for matching edge for c')

    const missingNodeRule = overrides.getNodeRule({ name: 'c', version: '1.0.0' })
    t.equal(missingNodeRule, overrides, 'getNodeRule returns root for misses')
    const matchRule = overrides.getMatchingRule({ name: 'a', version: '1.0.2' })
    t.equal(matchRule, overrides.children.get('a@1'), 'got a match for a@1')
    const unmatchedRule = overrides.getMatchingRule({ name: 'a', version: '2.0.0' })
    t.equal(unmatchedRule, null, 'got null for unmatched node')

    const keySpecRuleA = overrides.getNodeRule({ name: 'a', version: '1.0.1' })
    t.ok(keySpecRuleA, 'found a rule by keySpec for a@1')
    const keySpecRuleB = overrides.getNodeRule({ name: 'b', version: '1.1.1' })
    t.ok(keySpecRuleB, 'found a rule by keySpec for b')

    const valueRuleA = overrides.getNodeRule({ name: 'a', version: '1.0.2' })
    t.ok(valueRuleA, 'found a rule by value for a@1')
    const valueRuleB = overrides.getNodeRule({ name: 'b', version: '1.0.0' })
    t.ok(valueRuleB, 'found a rule by value for b')

    t.equal(edgeRuleA, keySpecRuleA, 'edge and node rules are identical for a@1')
    t.equal(keySpecRuleA, valueRuleA, 'both node rules are identical for a@1')
    t.equal(edgeRuleB, keySpecRuleB, 'edge and node rules are identical for b')
    t.equal(keySpecRuleB, valueRuleB, 'both node rules are identical for b')
  })

  t.test('loads child overrides as string', async (t) => {
    const overrides = new OverrideSet({
      overrides: {
        'a@1': '1.0.2',
        b: '1.0.0',
        'c@1.0.1': '1.0.2',
      },
    })

    t.ok(overrides.children.has('a@1'), 'created child for a@1')
    t.ok(overrides.children.has('b'), 'created child for b')

    const missingEdgeRule = overrides.getEdgeRule({ name: 'a', spec: '^2.0.0' })
    t.equal(missingEdgeRule, overrides, 'unmatched edge returns root rules')

    const edgeRuleA = overrides.getEdgeRule({ name: 'a', spec: '^1.0.1' })
    t.ok(edgeRuleA, 'found a rule for a matching edge for a@1')
    const edgeRuleB = overrides.getEdgeRule({ name: 'b', spec: '^1.1.0' })
    t.ok(edgeRuleB, 'found a rule for a matching edge for b')
    const edgeRuleC = overrides.getEdgeRule({ name: 'c', spec: '^1.0.0' })
    t.ok(edgeRuleC, 'returned a rule for matching edge for c')

    const missingNodeRule = overrides.getNodeRule({ name: 'c', version: '1.0.0' })
    t.equal(missingNodeRule, overrides, 'getNodeRule returns root for misses')
    const matchRule = overrides.getMatchingRule({ name: 'a', version: '1.0.2' })
    t.equal(matchRule, overrides.children.get('a@1'), 'got a match for a@1')
    const unmatchedRule = overrides.getMatchingRule({ name: 'a', version: '2.0.0' })
    t.equal(unmatchedRule, null, 'got null for unmatched node')

    const keySpecRuleA = overrides.getNodeRule({ name: 'a', version: '1.0.1' })
    t.ok(keySpecRuleA, 'found a rule by keySpec for a@1')
    const keySpecRuleB = overrides.getNodeRule({ name: 'b', version: '1.1.1' })
    t.ok(keySpecRuleB, 'found a rule by keySpec for b')

    const valueRuleA = overrides.getNodeRule({ name: 'a', version: '1.0.2' })
    t.ok(valueRuleA, 'found a rule by value for a@1')
    const valueRuleB = overrides.getNodeRule({ name: 'b', version: '1.0.0' })
    t.ok(valueRuleB, 'found a rule by value for b')

    t.equal(edgeRuleA, keySpecRuleA, 'edge and node rules are identical for a@1')
    t.equal(keySpecRuleA, valueRuleA, 'both node rules are identical for a@1')
    t.equal(edgeRuleB, keySpecRuleB, 'edge and node rules are identical for b')
    t.equal(keySpecRuleB, valueRuleB, 'both node rules are identical for b')
  })

  t.test('child rules take priority', async (t) => {
    const overrides = new OverrideSet({
      overrides: {
        foo: {
          bar: {
            '.': '2.0.0',
            baz: '3.0.0',
          },
          baz: '2.0.0',
        },
        bar: '1.0.0',
        baz: '1.0.0',
      },
    })

    const edgeRule = overrides.getEdgeRule({ name: 'foo', spec: '^1' })
    t.equal(edgeRule.name, 'foo', 'getEdgeRule returned child rule set')
    const ruleset = edgeRule.ruleset
    const fooRule = ruleset.get('foo')
    // these are both empty because the foo rule does not actually override
    // anything directly, it only carries child rules through
    t.equal(fooRule.keySpec, '', 'keySpec is empty')
    t.equal(fooRule.value, '', 'value is empty')
    const barRule = ruleset.get('bar')
    t.equal(barRule.keySpec, '', 'keySpec is empty')
    t.equal(barRule.value, '2.0.0', 'got the correct override for bar')
    const bazRule = ruleset.get('baz')
    t.equal(bazRule.keySpec, '', 'keySpec is empty')
    t.equal(bazRule.value, '2.0.0', 'got the correct override for baz')

    const childRule = edgeRule.getEdgeRule({ name: 'bar', spec: '^1.0.0' })
    const childRuleSet = childRule.ruleset
    const childBazRule = childRuleSet.get('baz')
    t.equal(childBazRule.keySpec, '', 'keySpec is empty')
    t.equal(childBazRule.value, '3.0.0', 'got the correct override for nested baz')
    const childBarRule = childRuleSet.get('bar')
    t.equal(childBarRule.keySpec, '', 'keySpec is empty')
    t.equal(childBarRule.value, '2.0.0', 'got the correct override for nested bar')
    const childFooRule = childRuleSet.get('foo')
    t.equal(childFooRule.keySpec, '', 'keySpec is empty')
    t.equal(childFooRule.value, '', 'value is empty')
  })

  t.test('coerces empty string to *', async (t) => {
    const overrides = new OverrideSet({
      overrides: {
        foo: {
          '.': '',
        },
        bar: {
        },
      },
    })

    const edgeRule = overrides.getEdgeRule({ name: 'foo', spec: '^1' })
    t.equal(edgeRule.value, '*', 'empty string was replaced with *')

    const barEdgeRule = overrides.getEdgeRule({ name: 'bar', spec: '^1' })
    t.equal(barEdgeRule.value, '', 'when rule is omitted entirely value is an empty string')
  })
})
