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use ecow::{eco_format, EcoString};
use typst_syntax::Spanned;
use crate::diag::{At, SourceResult};
use crate::engine::Engine;
use crate::foundations::{func, scope, Str, Value};
use crate::loading::Readable;
use crate::World;
/// Reads structured data from a JSON file.
///
/// The file must contain a valid JSON value, such as object or array. JSON
/// objects will be converted into Typst dictionaries, and JSON arrays will be
/// converted into Typst arrays. Strings and booleans will be converted into the
/// Typst equivalents, `null` will be converted into `{none}`, and numbers will
/// be converted to floats or integers depending on whether they are whole
/// numbers.
///
/// Be aware that integers larger than 2<sup>63</sup>-1 will be converted to
/// floating point numbers, which may result in an approximative value.
///
/// The function returns a dictionary, an array or, depending on the JSON file,
/// another JSON data type.
///
/// The JSON files in the example contain objects with the keys `temperature`,
/// `unit`, and `weather`.
///
/// # Example
/// ```example
/// #let forecast(day) = block[
/// #box(square(
/// width: 2cm,
/// inset: 8pt,
/// fill: if day.weather == "sunny" {
/// yellow
/// } else {
/// aqua
/// },
/// align(
/// bottom + right,
/// strong(day.weather),
/// ),
/// ))
/// #h(6pt)
/// #set text(22pt, baseline: -8pt)
/// #day.temperature °#day.unit
/// ]
///
/// #forecast(json("monday.json"))
/// #forecast(json("tuesday.json"))
/// ```
#[func(scope, title = "JSON")]
pub fn json(
/// The engine.
engine: &mut Engine,
/// Path to a JSON file.
///
/// For more details, see the [Paths section]($syntax/#paths).
path: Spanned<EcoString>,
) -> SourceResult<Value> {
let Spanned { v: path, span } = path;
let id = span.resolve_path(&path).at(span)?;
let data = engine.world.file(id).at(span)?;
json::decode(Spanned::new(Readable::Bytes(data), span))
}
#[scope]
impl json {
/// Reads structured data from a JSON string/bytes.
#[func(title = "Decode JSON")]
pub fn decode(
/// JSON data.
data: Spanned<Readable>,
) -> SourceResult<Value> {
let Spanned { v: data, span } = data;
serde_json::from_slice(data.as_slice())
.map_err(|err| eco_format!("failed to parse JSON ({err})"))
.at(span)
}
/// Encodes structured data into a JSON string.
#[func(title = "Encode JSON")]
pub fn encode(
/// Value to be encoded.
value: Spanned<Value>,
/// Whether to pretty print the JSON with newlines and indentation.
#[named]
#[default(true)]
pretty: bool,
) -> SourceResult<Str> {
let Spanned { v: value, span } = value;
if pretty {
serde_json::to_string_pretty(&value)
} else {
serde_json::to_string(&value)
}
.map(|v| v.into())
.map_err(|err| eco_format!("failed to encode value as JSON ({err})"))
.at(span)
}
}
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