#[cfg(test)]
mod tests {
    use crate::matches;
    use serde_json::json;

    #[test]
    fn array_element_match() {
        assert!(matches(
            &json!(
                { "a": { "$contains": 3 }}
            ),
            &json!({ "a": [1,2,3,4]})
        ));
    }

    #[test]
    fn array_any_str() {
        assert!(matches(
            &json!(
                { "a": { "$any": { "$contains": "world"} }}
            ),
            &json!({ "a": ["hello", "world"]})
        ));
    }

    #[test]
    fn array_any_sub() {
        assert!(matches(
            &json!(
                { "a": { "$any": { "key": { "$contains": "world"} }}}
            ),
            &json!({ "a": [{ "key": "hello" }, {"key": "world"}]})
        ));
    }

    #[test]
    fn array_all_nested() {
        assert!(!matches(
            &json!(
                { "key": { "$all": { "$gt": 10} }}
            ),
            &json!({ "key": [1,2,3,4,5]})
        ));

        assert!(matches(
            &json!(
                { "key": { "$all": { "$gt": 5} }}
            ),
            &json!({ "key": [6,7,8,9]})
        ));
    }

    #[test]
    fn array_all_direct() {
        assert!(!matches(
            &json!(
                { "$all": { "$gt": 10} }
            ),
            &json!([1, 2, 3, 4, 5])
        ));

        assert!(matches(
            &json!(
                { "$all": { "$gt": 5} }
            ),
            &json!([6, 7, 8, 9])
        ));
    }

    #[test]
    fn array_any_direct() {
        assert!(matches(
            &json!(
                { "$any": { "$contains": "world"} }
            ),
            &json!(["hello", "world"])
        ));
    }

    #[test]
    fn simple_mask() {
        assert!(matches(
            &json!(
                { "key": "value" }
            ),
            &json!({
                "key": "value",
                "num": 3
            })
        ));
        assert!(!matches(
            &json!(
                { "key": "value" }
            ),
            &json!({
                "key": "not_value",
                "num": 3
            })
        ));
    }

    #[test]
    fn nested_mask() {
        assert!(matches(
            &json!({
                "key": {
                    "nested": "value"
                }
            }),
            &json!({
                "key": {
                    "nested": "value"
                }
            })
        ));
    }

    #[test]
    fn not_equal() {
        assert!(matches(
            &json!({
                "key": {
                    "$ne": "value"
                }
            }),
            &json!({ "key": "not_value"})
        ));
    }

    #[test]
    fn greater_than() {
        assert!(!matches(
            &json!({
                "key": {
                    "$gt": 5
                }
            }),
            &json!({ "key": 4})
        ));
        assert!(!matches(
            &json!({
                "key": {
                    "$gt": 5
                }
            }),
            &json!({ "key": 5})
        ));
        assert!(matches(
            &json!({
                "key": {
                    "$gte": 5
                }
            }),
            &json!({ "key": 5})
        ));
    }

    #[test]
    fn less_than() {
        assert!(!matches(
            &json!({
                "key": {
                    "$lt": 5
                }
            }),
            &json!({ "key": 6})
        ));
        assert!(!matches(
            &json!({
                "key": {
                    "$lt": 5
                }
            }),
            &json!({ "key": 5})
        ));
        assert!(matches(
            &json!({
                "key": {
                    "$lte": 5
                }
            }),
            &json!({ "key": 5})
        ));
    }

    #[test]
    fn text_contains() {
        assert!(matches(
            &json!({
                "key": {
                    "$contains": "world"
                }
            }),
            &json!({
                "key": "hello world"
            })
        ));
    }

    #[test]
    fn range_op() {
        assert!(matches(
            &json!({"key": { "$range": [18, 30] }}),
            &json!({
                "key": 20
            })
        ));

        assert!(!matches(
            &json!({"key": { "$range": [18, 30] }}),
            &json!({
                "key": 15
            })
        ));

        assert!(!matches(
            &json!({"key": { "$range": [18, 30] }}),
            &json!({
                "key": 40
            })
        ));
    }

    #[test]
    fn in_array_contains() {
        assert!(matches(
            &json!({
                "key": {
                    "$contains": 3
                }
            }),
            &json!({
                "key": [1,2,3,4,5]
            })
        ));

        assert!(matches(
            &json!({
                "$not": {
                "key": {
                    "$contains": 3
                }}
            }),
            &json!({
                "key": [1,2,4,5]
            })
        ));
    }

    #[test]
    fn in_array() {
        assert!(matches(
            &json!({
                "key": {
                    "$in": 3
                }
            }),
            &json!({
                "key": [1,2,3,4,5]
            })
        ));

        assert!(matches(
            &json!({
                "key": {
                    "$nin": 3
                }
            }),
            &json!({
                "key": [1,2,4,5]
            })
        ));
    }

    #[test]
    fn and_op() {
        assert!(matches(
            &json!({
                "$and": [
                    { "key": "value" },
                    { "num": { "$gt": 5 }}
                ]
            }),
            &json!({
                "key": "value",
                "num": 7
            })
        ));

        assert!(!matches(
            &json!({
                "$and": [
                    { "key": "value" },
                    { "num": { "$gt": 5 }}
                ]
            }),
            &json!({
                "key": "value",
                "num": 3
            })
        ));
    }

    #[test]
    fn or_op() {
        let filter = json!({
            "$or": [
                { "key": "value" },
                { "num": { "$gt": 5} }
            ]
        });
        assert!(matches(
            &filter,
            &json!({
                "key": "value",
                "num": 6
            })
        ));
        assert!(matches(
            &filter,
            &json!({
                "key": "value",
                "num": 2
            })
        ));
        assert!(matches(
            &filter,
            &json!({
                "key": "not_value",
                "num": 6
            })
        ));
        assert!(!matches(
            &filter,
            &json!({
                "key": "not_value",
                "num": 2
            })
        ));
    }

    #[test]
    fn negation() {
        assert!(matches(
            &json!({
                "num": { "$not": { "$gt": 5 }}
            }),
            &json!({
                "num": 3
            })
        ));
    }

    #[test]
    fn exists() {
        assert!(matches(
            &json!({
                "key": { "$exists": true }
            }),
            &json!({
                "key": "value"
            })
        ));
        assert!(!matches(
            &json!({
                "key": { "$exists": true }
            }),
            &json!({})
        ));
        assert!(!matches(
            &json!({
                "key": { "$exists": false }
            }),
            &json!({
                "key": "value"
            })
        ));
    }

    #[test]
    fn size() {
        assert!(matches(
            &json!({
                "list": { "$size": 3}
            }),
            &json!({
                "list": [1,2,3]
            })
        ));
        assert!(!matches(
            &json!({
                "list": { "$size": 5}
            }),
            &json!({
                "list": [1,2,3]
            })
        ));
    }

    #[test]
    fn type_match() {
        assert!(matches(
            &json!({
                "key": { "$type": "number"}
            }),
            &json!({
                "key": 3
            })
        ));
        assert!(matches(
            &json!({
                "key": { "$type": "string"}
            }),
            &json!({
                "key": "value"
            })
        ));
        assert!(matches(
            &json!({
                "key": { "$type": "array"}
            }),
            &json!({
                "key": [1,2,3]
            })
        ));
        assert!(matches(
            &json!({
                "key": { "$type": "object"}
            }),
            &json!({
                "key": {
                    "nested": "value"
                }
            })
        ));
    }

    #[test]
    fn regex_match() {
        assert!(matches(
            &json!({
                "key": { "$regex": "hello (world|json)"}
            }),
            &json!({
                "key": "hello world"
            })
        ));
        assert!(matches(
            &json!({
                "key": { "$regex": "hello (world|json)"}
            }),
            &json!({
                "key": "hello json"
            })
        ));
        assert!(!matches(
            &json!({
                "key": { "$regex": "hello (world|json)"}
            }),
            &json!({
                "key": "hello rust"
            })
        ));
        assert!(matches(
            &json!({
                "key": { "$regex": "hello (world|json)"}
            }),
            &json!({
                "key": "hello world!"
            })
        ));
    }

    #[test]
    fn multiple_mask() {
        assert!(matches(
            &json!({
                "key": "value",
                "num": 3
            }),
            &json!({
                "key": "value",
                "num": 3,
                "extra": "value"
            })
        ));
        assert!(!matches(
            &json!({
                "key": "value",
                "num": 3
            }),
            &json!({
                "key": "value",
                "num": 5,
                "extra": "value"
            })
        ));
    }

    #[test]
    fn array_size_cmp() {
        let empty: Vec<i32> = vec![];
        let one = vec![1];
        let two = vec![1, 2];
        let many = vec![1, 2, 3, 4, 5, 6];

        let filter = json!({
            "list": {"$size": {"$gt": 0}}
        });

        assert!(!matches(&filter, &json!({"list": empty})));
        assert!(matches(&filter, &json!({"list": one})));
        assert!(matches(&filter, &json!({"list": two})));
        assert!(matches(&filter, &json!({"list": many})));
    }

    #[test]
    fn nested_modifier() {
        assert!(matches(
            &json!({
                "key": {
                    "nested": {
                        "$gt": 5
                    }
                }
            }),
            &json!({
                "key": { "nested": 7 }
            })
        ));

        assert!(!matches(
            &json!({
                "key": {
                    "nested": {
                        "$gt": 5
                    }
                }
            }),
            &json!({
                "key": { "nested": 2 }
            })
        ));
    }
}