var vows = require('vows')
, assert = require('assert')
, levels = require('../lib/levels');

function assertThat(level) {
    function assertForEach(assertion, test, otherLevels) {
        otherLevels.forEach(function(other) {
            assertion.call(assert, test.call(level, other));
        });
    }

    return {
        isLessThanOrEqualTo: function(levels) {
            assertForEach(assert.isTrue, level.isLessThanOrEqualTo, levels);
        },
        isNotLessThanOrEqualTo: function(levels) {
            assertForEach(assert.isFalse, level.isLessThanOrEqualTo, levels);
        },
        isGreaterThanOrEqualTo: function(levels) {
            assertForEach(assert.isTrue, level.isGreaterThanOrEqualTo, levels);
        },
        isNotGreaterThanOrEqualTo: function(levels) {
            assertForEach(assert.isFalse, level.isGreaterThanOrEqualTo, levels);
        }
    };
}

vows.describe('levels').addBatch({
    'values': {
        topic: levels,
        'should define some levels': function(levels) {
            assert.isNotNull(levels.ALL);
            assert.isNotNull(levels.TRACE);
            assert.isNotNull(levels.DEBUG);
            assert.isNotNull(levels.INFO);
            assert.isNotNull(levels.WARN);
            assert.isNotNull(levels.ERROR);
            assert.isNotNull(levels.FATAL);
            assert.isNotNull(levels.OFF);
        },
        'ALL': {
            topic: levels.ALL,
            'should be less than the other levels': function(all) {
                assertThat(all).isLessThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
            },
            'should be greater than no levels': function(all) {
                assertThat(all).isNotGreaterThanOrEqualTo([levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
            }
        },
        'TRACE': {
            topic: levels.TRACE,
            'should be less than DEBUG': function(trace) {
                assertThat(trace).isLessThanOrEqualTo([levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
                assertThat(trace).isNotLessThanOrEqualTo([levels.ALL]);
            },
            'should be greater than ALL': function(trace) {
                assertThat(trace).isGreaterThanOrEqualTo([levels.ALL, levels.TRACE]);
                assertThat(trace).isNotGreaterThanOrEqualTo([levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
            }
        },
        'DEBUG': {
            topic: levels.DEBUG,
            'should be less than INFO': function(debug) {
                assertThat(debug).isLessThanOrEqualTo([levels.INFO, levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
                assertThat(debug).isNotLessThanOrEqualTo([levels.ALL, levels.TRACE]);
            },
            'should be greater than TRACE': function(debug) {
                assertThat(debug).isGreaterThanOrEqualTo([levels.ALL, levels.TRACE]);
                assertThat(debug).isNotGreaterThanOrEqualTo([levels.INFO, levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
            }
        },
        'INFO': {
            topic: levels.INFO,
            'should be less than WARN': function(info) {
                assertThat(info).isLessThanOrEqualTo([levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
                assertThat(info).isNotLessThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG]);
            },
            'should be greater than DEBUG': function(info) {
                assertThat(info).isGreaterThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG]);
                assertThat(info).isNotGreaterThanOrEqualTo([levels.WARN, levels.ERROR, levels.FATAL, levels.OFF]);
            }
        },
        'WARN': {
            topic: levels.WARN,
            'should be less than ERROR': function(warn) {
                assertThat(warn).isLessThanOrEqualTo([levels.ERROR, levels.FATAL, levels.OFF]);
                assertThat(warn).isNotLessThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO]);
            },
            'should be greater than INFO': function(warn) {
                assertThat(warn).isGreaterThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO]);
                assertThat(warn).isNotGreaterThanOrEqualTo([levels.ERROR, levels.FATAL, levels.OFF]);
            }
        },
        'ERROR': {
            topic: levels.ERROR,
            'should be less than FATAL': function(error) {
                assertThat(error).isLessThanOrEqualTo([levels.FATAL, levels.OFF]);
                assertThat(error).isNotLessThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN]);
            },
            'should be greater than WARN': function(error) {
                assertThat(error).isGreaterThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN]);
                assertThat(error).isNotGreaterThanOrEqualTo([levels.FATAL, levels.OFF]);
            }
        },
        'FATAL': {
            topic: levels.FATAL,
            'should be less than OFF': function(fatal) {
                assertThat(fatal).isLessThanOrEqualTo([levels.OFF]);
                assertThat(fatal).isNotLessThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR]);
            },
            'should be greater than ERROR': function(fatal) {
                assertThat(fatal).isGreaterThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR]);
                assertThat(fatal).isNotGreaterThanOrEqualTo([levels.OFF]);
            }
        },
        'OFF': {
            topic: levels.OFF,
            'should not be less than anything': function(off) {
                assertThat(off).isNotLessThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR, levels.FATAL]);
            },
            'should be greater than everything': function(off) {
                assertThat(off).isGreaterThanOrEqualTo([levels.ALL, levels.TRACE, levels.DEBUG, levels.INFO, levels.WARN, levels.ERROR, levels.FATAL]);
            }
        }
    },
    'isGreaterThanOrEqualTo': {
        topic: levels.INFO,
        'should handle string arguments': function(info) {
            assertThat(info).isGreaterThanOrEqualTo(["all", "trace", "debug"]);
            assertThat(info).isNotGreaterThanOrEqualTo(['warn', 'ERROR', 'Fatal', 'off']);
        }
    },
    'isLessThanOrEqualTo': {
        topic: levels.INFO,
        'should handle string arguments': function(info) {
            assertThat(info).isNotLessThanOrEqualTo(["all", "trace", "debug"]);
            assertThat(info).isLessThanOrEqualTo(['warn', 'ERROR', 'Fatal', 'off']);
        }
    },
    'toLevel': {
        'with lowercase argument': {
            topic: levels.toLevel("debug"),
            'should take the string and return the corresponding level': function(level) {
                assert.equal(level, levels.DEBUG);
            }
        },
        'with uppercase argument': {
            topic: levels.toLevel("DEBUG"),
            'should take the string and return the corresponding level': function(level) {
                assert.equal(level, levels.DEBUG);
            }
        },
        'with varying case': {
            topic: levels.toLevel("DeBuG"),
            'should take the string and return the corresponding level': function(level) {
                assert.equal(level, levels.DEBUG);
            }
        },
        'with unrecognised argument': {
            topic: levels.toLevel("cheese"),
            'should return undefined': function(level) {
                assert.isUndefined(level);
            }
        },
        'with unrecognised argument and default value': {
            topic: levels.toLevel("cheese", levels.DEBUG),
            'should return default value': function(level) {
                assert.equal(level, levels.DEBUG);
            }
        }
    }
}).export(module);