use geth_types::{DocumentId, ResourceId, UnixMillis};
use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct DocumentResource {
    pub id: DocumentId,
    pub resource: ResourceId,
    pub name: String,
    pub sync_status: String,
    pub state_bytes: u64,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct DocumentState {
    pub document: DocumentResource,
    pub state_json: String,
    pub updated_at: UnixMillis,
}

#[derive(Debug, thiserror::Error)]
pub enum DocumentError {
    #[error("invalid document name: {0}")]
    InvalidName(String),
    #[error("invalid document JSON state: {0}")]
    InvalidState(#[from] serde_json::Error),
}

pub fn validate_document_name(name: &str) -> Result<(), DocumentError> {
    if name.is_empty()
        || !name
            .bytes()
            .all(|byte| byte.is_ascii_alphanumeric() || matches!(byte, b'.' | b'_' | b'-'))
    {
        return Err(DocumentError::InvalidName(name.to_owned()));
    }
    Ok(())
}

pub fn normalize_document_state(state_json: &str) -> Result<String, DocumentError> {
    let value: serde_json::Value = serde_json::from_str(state_json)?;
    Ok(serde_json::to_string(&value)?)
}

#[must_use]
pub fn automerge_roadmap() -> &'static str {
    "future documents use Automerge sync over Iroh with resource-local authorization"
}

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

    #[test]
    fn document_name_validation_rejects_paths_and_empty_names() {
        assert!(validate_document_name("notes").is_ok());
        assert!(validate_document_name("notes.v1").is_ok());
        assert!(validate_document_name("").is_err());
        assert!(validate_document_name("../notes").is_err());
        assert!(validate_document_name("notes/main").is_err());
        assert!(validate_document_name("notes main").is_err());
    }

    #[test]
    fn document_state_is_validated_and_normalized_json() {
        assert_eq!(
            normalize_document_state(r#"{ "title": "notes", "done": false }"#).expect("normalize"),
            r#"{"done":false,"title":"notes"}"#
        );
        assert!(normalize_document_state("{").is_err());
    }
}