use geth_auth::{AuthExplanation, AuthOp};
use geth_cas::{FileConflict, FileRoot, FileRootScan};
use geth_db::{CrSqliteChangeBatch, DbResource};
use geth_discovery::{DiscoveredPeer, PeerCard};
use geth_document::{DocumentResource, DocumentState};
use geth_keychain::KeychainOp;
use geth_kv::{KvEntry, KvResource};
use geth_pipe::{PipeConnection, PipeListener};
use geth_pubsub::PubsubMessage;
use geth_resource::ResourceDescriptor;
use geth_secrets::{BearerAccess, ResourceMasterSecret};
use geth_ssh_identity::{
    SshCertApproval, SshCertRequest, SshCertificateRecord, SshRevocationEntry,
};
use geth_types::BlobHash;
use serde::{Deserialize, Serialize};
use std::path::PathBuf;

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "kebab-case")]
pub enum ControlRequest {
    Status,
    NodeId,
    PeerCardExport {
        out: Option<PathBuf>,
    },
    PeerCardImport {
        path: PathBuf,
    },
    PeerCardList,
    ResourceList,
    ResourceCreate {
        kind: String,
        name: String,
    },
    CasAdd {
        path: PathBuf,
    },
    CasGet {
        hash: BlobHash,
        out: PathBuf,
    },
    CasHash {
        path: PathBuf,
    },
    CasHas {
        hash: BlobHash,
    },
    CasPin {
        hash: BlobHash,
    },
    CasUnpin {
        hash: BlobHash,
    },
    CasCleanup {
        dry_run: bool,
    },
    CasList,
    CasRootAdd {
        name: String,
        path: PathBuf,
    },
    CasRootList,
    CasRootScan {
        name: String,
    },
    CasConflictRecord {
        root: String,
        path: String,
        kind: String,
        detail: String,
        base_tree: Option<BlobHash>,
        local_tree: Option<BlobHash>,
        remote_tree: Option<BlobHash>,
    },
    CasConflictList {
        root: Option<String>,
    },
    CasConflictResolve {
        conflict_id: String,
        resolution: String,
        note: Option<String>,
    },
    KeychainInit {
        admin_key_path: Option<PathBuf>,
    },
    KeychainStatus,
    SecretStatus,
    SecretCreate {
        resource: String,
    },
    SecretRotate {
        resource: String,
    },
    SecretBearerCreate {
        resource: String,
        capabilities: Vec<String>,
        expires_at_ms: Option<i64>,
    },
    SecretBearerList,
    SecretBearerRevoke {
        resource: String,
        secret: String,
    },
    AuthExplain {
        subject: String,
        resource: String,
        capability: String,
    },
    AuthGrant {
        subject: String,
        resource: String,
        capability: String,
        grant_id: Option<String>,
    },
    AuthRevoke {
        resource: String,
        grant_id: String,
    },
    SshCertRequest {
        public_key_path: PathBuf,
        cert_kind: String,
        principals: Vec<String>,
        requested_validity: Option<String>,
        renewal_of: Option<String>,
        reason: Option<String>,
    },
    SshCertRequests,
    SshCertApprove {
        request_id: String,
        ca_key_path: PathBuf,
        valid_for: Option<String>,
        serial: Option<u64>,
        out: Option<PathBuf>,
    },
    SshCertImport {
        request_id: String,
        cert_path: PathBuf,
    },
    SshCertList,
    SshRevocationAdd {
        kind: String,
        target: String,
        reason: Option<String>,
    },
    SshRevocationList,
    SshRevocationExport {
        out: PathBuf,
        format: String,
    },
    DbAdd {
        name: String,
        path: PathBuf,
    },
    DbStatus {
        name: String,
    },
    DbChanges {
        name: String,
        after_db_version: Option<i64>,
        limit: u32,
    },
    KvCreate {
        name: String,
    },
    KvSet {
        name: String,
        key: String,
        value: String,
    },
    KvGet {
        name: String,
        key: String,
    },
    DocumentCreate {
        name: String,
    },
    DocumentStatus {
        name: String,
    },
    DocumentSet {
        name: String,
        state_json: String,
    },
    DocumentGet {
        name: String,
    },
    PubsubPub {
        topic: String,
        message: String,
    },
    PubsubSub {
        topic: String,
    },
    PipeListen {
        name: String,
    },
    PipeConnect {
        target: String,
    },
    ModuleStub {
        module: String,
        command: String,
    },
}

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "kebab-case")]
pub enum ControlResponse {
    Status(StatusResponse),
    NodeId(NodeIdResponse),
    PeerCardExported {
        card: PeerCard,
        out: Option<PathBuf>,
        note: String,
    },
    PeerCardImported {
        peer: DiscoveredPeer,
        note: String,
    },
    PeerCardList {
        peers: Vec<DiscoveredPeer>,
        note: String,
    },
    ResourceList {
        resources: Vec<ResourceDescriptor>,
    },
    ResourceCreated {
        resource: ResourceDescriptor,
    },
    CasAdded {
        hash: BlobHash,
        size_bytes: u64,
    },
    CasGot {
        hash: BlobHash,
        out: PathBuf,
        size_bytes: u64,
    },
    CasHash {
        hash: BlobHash,
    },
    CasHas {
        hash: BlobHash,
        present: bool,
    },
    CasPinned {
        hash: BlobHash,
        pinned: bool,
    },
    CasCleanup {
        removed: Vec<BlobHash>,
        retained_pinned: Vec<BlobHash>,
        dry_run: bool,
    },
    CasList {
        blobs: Vec<CasBlob>,
    },
    CasRootAdded {
        root: FileRoot,
    },
    CasRootList {
        roots: Vec<FileRoot>,
    },
    CasRootScanned {
        scan: FileRootScan,
    },
    CasConflictRecorded {
        conflict: FileConflict,
    },
    CasConflictList {
        conflicts: Vec<FileConflict>,
    },
    CasConflictResolved {
        conflict: FileConflict,
    },
    KeychainStatus(KeychainStatusResponse),
    KeychainInitialized {
        ops: Vec<KeychainOp>,
    },
    SecretStatus {
        secrets: Vec<ResourceMasterSecret>,
    },
    SecretCreated {
        secret: ResourceMasterSecret,
    },
    SecretBearerCreated {
        access: BearerAccess,
    },
    SecretBearerList {
        access: Vec<BearerAccess>,
    },
    SecretBearerRevoked {
        resource: String,
        secret: String,
    },
    AuthExplain(AuthExplanation),
    AuthOpRecorded {
        op: AuthOp,
    },
    SshCertRequested {
        request: SshCertRequest,
    },
    SshCertRequests {
        requests: Vec<SshCertRequest>,
    },
    SshCertApproved {
        approval: SshCertApproval,
    },
    SshCertImported {
        certificate: SshCertificateRecord,
    },
    SshCertList {
        requests: Vec<SshCertRequest>,
        certificates: Vec<SshCertificateRecord>,
    },
    SshRevocationAdded {
        revocation: SshRevocationEntry,
    },
    SshRevocationList {
        revocations: Vec<SshRevocationEntry>,
    },
    SshRevocationExported {
        out: PathBuf,
        format: String,
        count: usize,
        note: String,
    },
    DbAdded {
        db: DbResource,
    },
    DbStatus {
        db: DbResource,
    },
    DbChanges {
        db: DbResource,
        batch: CrSqliteChangeBatch,
    },
    KvCreated {
        kv: KvResource,
    },
    KvSet {
        entry: KvEntry,
    },
    KvGet {
        entry: Option<KvEntry>,
    },
    DocumentCreated {
        document: DocumentResource,
    },
    DocumentStatus {
        document: DocumentResource,
    },
    DocumentSet {
        state: DocumentState,
    },
    DocumentGet {
        state: DocumentState,
    },
    PubsubPublished {
        message: PubsubMessage,
    },
    PubsubMessages {
        topic: String,
        messages: Vec<PubsubMessage>,
        note: String,
    },
    PipeListening {
        listener: PipeListener,
    },
    PipeConnected {
        connection: PipeConnection,
    },
    NotImplemented {
        module: String,
        command: String,
    },
    Error {
        message: String,
    },
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct StatusResponse {
    pub home: PathBuf,
    pub socket: PathBuf,
    pub agent_id: String,
    pub node_id: String,
    pub iroh_enabled: bool,
    pub endpoint_id: Option<String>,
    pub iroh_relay_mode: String,
    pub iroh_local_discovery: bool,
    pub iroh: String,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct NodeIdResponse {
    pub agent_id: String,
    pub node_id: String,
    pub endpoint_id: Option<String>,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct KeychainStatusResponse {
    pub initialized: bool,
    pub admin_keys: usize,
    pub users: usize,
    pub devices: usize,
    pub nodes: usize,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct CasBlob {
    pub hash: BlobHash,
    pub size_bytes: u64,
    pub pinned: bool,
}

#[derive(Debug, thiserror::Error)]
pub enum ControlError {
    #[error("json error: {0}")]
    Json(#[from] serde_json::Error),
}

pub fn encode_request(request: &ControlRequest) -> Result<String, ControlError> {
    let mut line = serde_json::to_string(request)?;
    line.push('\n');
    Ok(line)
}

pub fn decode_request(line: &str) -> Result<ControlRequest, ControlError> {
    serde_json::from_str(line).map_err(ControlError::from)
}

pub fn encode_response(response: &ControlResponse) -> Result<String, ControlError> {
    let mut line = serde_json::to_string(response)?;
    line.push('\n');
    Ok(line)
}

pub fn decode_response(line: &str) -> Result<ControlResponse, ControlError> {
    serde_json::from_str(line).map_err(ControlError::from)
}

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

    #[test]
    fn control_request_response_serialization_roundtrip() {
        let request = ControlRequest::CasHas {
            hash: "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef".into(),
        };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );

        let response = ControlResponse::CasHas {
            hash: "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef".into(),
            present: true,
        };
        assert_eq!(
            decode_response(&encode_response(&response).expect("encode")).expect("decode"),
            response
        );

        let request = ControlRequest::SshRevocationExport {
            out: PathBuf::from("revocations.krl-spec"),
            format: "openssh-krl-spec".to_owned(),
        };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );

        let response = ControlResponse::SshRevocationExported {
            out: PathBuf::from("revocations.krl-spec"),
            format: "openssh-krl-spec".to_owned(),
            count: 2,
            note: "OpenSSH KRL specification".to_owned(),
        };
        assert_eq!(
            decode_response(&encode_response(&response).expect("encode")).expect("decode"),
            response
        );

        let request = ControlRequest::DocumentSet {
            name: "notes".to_owned(),
            state_json: r#"{"title":"notes"}"#.to_owned(),
        };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );

        let request = ControlRequest::PipeListen {
            name: "inbox".to_owned(),
        };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );

        let request = ControlRequest::DbChanges {
            name: "notes".to_owned(),
            after_db_version: Some(7),
            limit: 10,
        };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );

        let request = ControlRequest::CasRootScan {
            name: "notes".to_owned(),
        };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );

        let request = ControlRequest::CasConflictResolve {
            conflict_id: "file-conflict:notes:1".to_owned(),
            resolution: "keep-local".to_owned(),
            note: Some("local file is authoritative".to_owned()),
        };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );

        let request = ControlRequest::PeerCardExport { out: None };
        assert_eq!(
            decode_request(&encode_request(&request).expect("encode")).expect("decode"),
            request
        );
    }
}