1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

use edgedb_protocol::{model::Uuid, value::Value};
use itertools::Itertools;

use crate::{prim::EdgedbPrim, value::EdgedbValue, EdgedbObject};

/// Basically a `Uuid` and an `Option<T>`. Use this instead of adding `id: Uuid` field to your structs.
#[derive(Debug, PartialEq, Eq)]
pub struct Ref<T: EdgedbObject> {
    pub id: Uuid,
    pub known_value: Option<T>,
}

impl<T: EdgedbObject> EdgedbValue for Ref<T> {
    type NativeArgType = Value;

    fn from_edgedb_value(value: edgedb_protocol::value::Value) -> anyhow::Result<Self> {
        match value {
            edgedb_protocol::value::Value::Object { shape, mut fields } => {
                let uuid_i = shape
                    .elements
                    .iter()
                    .find_position(|e| e.name == "id")
                    .map(|(i, _)| i);

                let id = uuid_i.and_then(|i| fields[i].take());
                let id = Uuid::from_edgedb_val(id.ok_or_else(|| anyhow::anyhow!("Expected an object with an 'id' field when deserializing a Ref, got something else"))?)?;

                if shape.elements.len() == 1 {
                    return Ok(Self {
                        id,
                        known_value: None,
                    });
                }

                // if shape.elements.len() == 2 {
                //     let known_value_i = shape
                //         .elements
                //         .iter()
                //         .find_position(|e: &&edgedb_protocol::codec::ShapeElement| {
                //             e.name == "_known_value"
                //         })
                //         .map(|(i, _)| i);

                //     if let Some(known_value_i) = known_value_i {
                //         let known_value = fields[known_value_i].take();
                //         let known_value = known_value
                //             .map(EdgedbValue::from_edgedb_value)
                //             .transpose()?;

                //         return Ok(Self { id, known_value });
                //     }
                // }

                let known_value = Some(T::from_edgedb_object(shape, fields)?);

                Ok(Self { id, known_value })
            }
            edgedb_protocol::value::Value::Uuid(_) => {
                anyhow::bail!("Expected an object when deserializing a Ref, got uuid (do we want to handle this?)")
            }
            edgedb_protocol::value::Value::SparseObject(_) => {
                anyhow::bail!("Expected an object when deserializing a Ref, got sparse object (?)")
            }
            _ => {
                anyhow::bail!("Expected an object when deserializing a Ref, got something else")
            }
        }
    }

    // fn to_edgedb_value(self) -> anyhow::Result<edgedb_protocol::value::Value> {
    //     todo!()
    // }
}

#[cfg(test)]
mod test {
    use crate::{value::EdgedbSetValue, EdgedbObject};

    #[derive(Debug, PartialEq)]
    struct Inner {
        req: String,
        opt: Option<String>,
    }

    impl EdgedbObject for Inner {
        fn from_edgedb_object(
            shape: edgedb_protocol::codec::ObjectShape,
            mut fields: Vec<Option<edgedb_protocol::value::Value>>,
        ) -> anyhow::Result<Self> {
            let mut req = None;
            let mut opt = None;

            for (i, s) in shape.elements.iter().enumerate() {
                match s.name.as_str() {
                    "req" => {
                        req = fields[i]
                            .take()
                            .map(EdgedbSetValue::from_edgedb_set_value)
                            .transpose()?;
                    }
                    "opt" => {
                        opt = fields[i]
                            .take()
                            .map(EdgedbSetValue::from_edgedb_set_value)
                            .transpose()?;
                    }
                    _ => {}
                }
            }

            Ok(Self {
                req: EdgedbSetValue::interpret_possibly_missing_required_value(req)?,
                opt: EdgedbSetValue::interpret_possibly_missing_required_value(opt)?,
            })
        }

        // fn to_edgedb_object(
        //     &self,
        // ) -> anyhow::Result<(
        //     edgedb_protocol::codec::ObjectShape,
        //     Vec<Option<edgedb_protocol::value::Value>>,
        // )> {
        //     todo!()
        // }
    }

    #[tokio::test]
    async fn some_queries() -> anyhow::Result<()> {
        let _conn = edgedb_tokio::create_client().await?;

        // dbg!(query::<Vec<Ref<Inner>>>(&conn, "select Inner;").await?);
        // dbg!(query::<Vec<Ref<Inner>>>(&conn, "select Inner {id, opt, req};").await?);

        Ok(())
    }
}