turbocommit 3.2.1

use serde::{Deserialize, Serialize};
use std::{fmt, str::FromStr};

pub const DEFAULT_MODEL: &str = "gpt-5.6-luna";
pub const SUPPORTED_MODELS: &[&str] = &["gpt-5.6-luna", "gpt-5.6-terra", "gpt-5.6-sol", "gpt-5.6"];

#[derive(Debug, Clone, PartialEq)]
pub struct Model(pub String);

impl Default for Model {
    fn default() -> Self {
        Self(DEFAULT_MODEL.to_string())
    }
}

impl FromStr for Model {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        if !SUPPORTED_MODELS.contains(&s) {
            return Err(format!(
                "Invalid model '{s}'. Supported GPT-5.6 models: {}",
                SUPPORTED_MODELS.join(", ")
            ));
        }
        Ok(Self(s.to_string()))
    }
}

impl fmt::Display for Model {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(&self.0)
    }
}

impl Serialize for Model {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        serializer.serialize_str(&self.0)
    }
}

impl<'de> Deserialize<'de> for Model {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        Ok(Self(s))
    }
}

impl Model {
    pub const fn context_size(&self) -> usize {
        1_050_000
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn default_is_luna() {
        assert_eq!(Model::default().0, "gpt-5.6-luna");
    }

    #[test]
    fn gpt56_family_has_documented_context_size() {
        for name in SUPPORTED_MODELS {
            assert_eq!(Model((*name).to_string()).context_size(), 1_050_000);
        }
    }

    #[test]
    fn gpt56_family_and_sol_alias_are_allowed() {
        for name in SUPPORTED_MODELS {
            assert!(Model::from_str(name).is_ok(), "{name} should be accepted");
        }
    }

    #[test]
    fn legacy_and_unknown_models_are_rejected() {
        for name in ["gpt-5.4", "gpt-5.6-pro", "gpt-4o", "unknown-model"] {
            let err = Model::from_str(name).unwrap_err();
            assert!(err.contains(name));
            assert!(err.contains("gpt-5.6-luna"));
        }
    }
}