32 lines
1.2 KiB
Rust
32 lines
1.2 KiB
Rust
use crate::context::Context;
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use crate::db::variables::UserAndRoom;
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use crate::error::BotError;
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use crate::error::DiceRollingError;
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use crate::parser::Amount;
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use crate::parser::Element as NewElement;
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use futures::stream::{self, StreamExt, TryStreamExt};
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//New hotness
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pub async fn calculate_dice_amount(amounts: &[Amount], ctx: &Context<'_>) -> Result<i32, BotError> {
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let stream = stream::iter(amounts);
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let key = UserAndRoom(&ctx.username, ctx.room.id.as_str());
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let variables = &ctx.db.variables.get_user_variables(&key)?;
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use DiceRollingError::VariableNotFound;
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let dice_amount: Result<i32, BotError> = stream
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.then(|amount| async move {
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match &amount.element {
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NewElement::Number(num_dice) => Ok(*num_dice * amount.operator.mult()),
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NewElement::Variable(variable) => variables
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.get(variable)
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.ok_or(VariableNotFound(variable.clone().to_string()))
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.map(|i| *i)
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.map_err(|e| e.into()),
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}
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})
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.try_fold(0, |total, num_dice| async move { Ok(total + num_dice) })
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.await;
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dice_amount
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}
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