use crate::{
    entities::revision::{RepeatedRevision, Revision},
    errors::{internal_error, CollaborateError},
};
use flowy_derive::ProtoBuf;
use lib_ot::{core::OperationTransformable, errors::OTError, rich_text::RichTextDelta};

#[derive(ProtoBuf, Default, Debug, Clone)]
pub struct CreateDocParams {
    #[pb(index = 1)]
    pub id: String,

    #[pb(index = 2)]
    pub revisions: RepeatedRevision,
}

#[derive(ProtoBuf, Default, Debug, Clone, Eq, PartialEq)]
pub struct DocumentInfo {
    #[pb(index = 1)]
    pub doc_id: String,

    #[pb(index = 2)]
    pub text: String,

    #[pb(index = 3)]
    pub rev_id: i64,

    #[pb(index = 4)]
    pub base_rev_id: i64,
}

impl DocumentInfo {
    pub fn delta(&self) -> Result<RichTextDelta, OTError> {
        let delta = RichTextDelta::from_bytes(&self.text)?;
        Ok(delta)
    }

    pub fn from_revisions(doc_id: &str, revisions: Vec<Revision>) -> Result<Self, CollaborateError> {
        let mut document_delta = RichTextDelta::new();
        let mut base_rev_id = 0;
        let mut rev_id = 0;

        for revision in revisions {
            base_rev_id = revision.base_rev_id;
            rev_id = revision.rev_id;
            let delta = RichTextDelta::from_bytes(revision.delta_data).map_err(internal_error)?;
            document_delta = document_delta.compose(&delta).map_err(internal_error)?;
        }
        let text = document_delta.to_json();

        Ok(DocumentInfo {
            doc_id: doc_id.to_string(),
            text,
            rev_id,
            base_rev_id,
        })
    }
}

impl std::convert::TryFrom<Revision> for DocumentInfo {
    type Error = CollaborateError;

    fn try_from(revision: Revision) -> Result<Self, Self::Error> {
        if !revision.is_initial() {
            return Err(CollaborateError::revision_conflict()
                .context("Revision's rev_id should be 0 when creating the document"));
        }

        let delta = RichTextDelta::from_bytes(&revision.delta_data)?;
        let doc_json = delta.to_json();

        Ok(DocumentInfo {
            doc_id: revision.doc_id,
            text: doc_json,
            rev_id: revision.rev_id,
            base_rev_id: revision.base_rev_id,
        })
    }
}

#[derive(ProtoBuf, Default, Debug, Clone)]
pub struct ResetDocumentParams {
    #[pb(index = 1)]
    pub doc_id: String,

    #[pb(index = 2)]
    pub revisions: RepeatedRevision,
}

#[derive(ProtoBuf, Default, Debug, Clone)]
pub struct DocumentDelta {
    #[pb(index = 1)]
    pub doc_id: String,

    #[pb(index = 2)]
    pub text: String, // RichTextDelta
}

#[derive(ProtoBuf, Default, Debug, Clone)]
pub struct NewDocUser {
    #[pb(index = 1)]
    pub user_id: String,

    #[pb(index = 2)]
    pub rev_id: i64,

    #[pb(index = 3)]
    pub doc_id: String,
}

#[derive(ProtoBuf, Default, Debug, Clone)]
pub struct DocIdentifier {
    #[pb(index = 1)]
    pub doc_id: String,
}

impl std::convert::From<String> for DocIdentifier {
    fn from(doc_id: String) -> Self { DocIdentifier { doc_id } }
}

impl std::convert::From<&String> for DocIdentifier {
    fn from(doc_id: &String) -> Self {
        DocIdentifier {
            doc_id: doc_id.to_owned(),
        }
    }
}