syntax = "proto3";
package workspace.v1;

import "google/protobuf/timestamp.proto";

service WorkspaceController {
    // Initialize the canonical repository (first-time setup)
    rpc InitCanonical(InitCanonicalRequest) returns (InitCanonicalResponse);

    // Get canonical repo status
    rpc GetCanonicalHead(GetCanonicalHeadRequest) returns (GetCanonicalHeadResponse);

    // Session workspace lifecycle
    rpc CreateWorkspace(CreateWorkspaceRequest) returns (CreateWorkspaceResponse);
    rpc GetWorkspaceStatus(GetWorkspaceStatusRequest) returns (GetWorkspaceStatusResponse);
    rpc DestroyWorkspace(DestroyWorkspaceRequest) returns (DestroyWorkspaceResponse);

    // Diff and commit
    rpc GetDiff(GetDiffRequest) returns (GetDiffResponse);
    rpc StageFiles(StageFilesRequest) returns (StageFilesResponse);
    rpc Commit(CommitRequest) returns (CommitResponse);
    rpc GetLog(GetLogRequest) returns (GetLogResponse);

    // Abandon (discard all changes)
    rpc Abandon(AbandonRequest) returns (AbandonResponse);

    // List active workspaces
    rpc ListWorkspaces(ListWorkspacesRequest) returns (ListWorkspacesResponse);

    // Get a tar archive of the canonical repo at a specific commit
    rpc GetArchive(GetArchiveRequest) returns (stream ArchiveChunk);

    // --- Remote sync (Phase 3) ---

    // Push canonical branch to a configured remote
    rpc PushToRemote(PushToRemoteRequest) returns (PushToRemoteResponse);

    // Fetch refs from a configured remote into inbound/ branches
    rpc FetchFromRemote(FetchFromRemoteRequest) returns (FetchFromRemoteResponse);

    // List configured remotes from .guildhouse/remotes.yaml
    rpc ListRemotes(ListRemotesRequest) returns (ListRemotesResponse);

    // Get sync status between canonical and a remote
    rpc GetRemoteSyncStatus(GetRemoteSyncStatusRequest) returns (GetRemoteSyncStatusResponse);

    // Report commit status check to a remote provider (GitHub/Forgejo/GitLab)
    rpc ReportStatus(ReportStatusRequest) returns (ReportStatusResponse);

    // --- Merge operations (Phase 4) ---

    // Merge an inbound branch into canonical main
    rpc MergeToCanonical(MergeToCanonicalRequest) returns (MergeToCanonicalResponse);

    // Clean up an inbound branch after merge or rejection
    rpc CleanupInboundBranch(CleanupInboundBranchRequest) returns (CleanupInboundBranchResponse);

    // List inbound branches (fetched from remotes)
    rpc ListInboundBranches(ListInboundBranchesRequest) returns (ListInboundBranchesResponse);

    // Lightweight remote HEAD check (ls-remote equivalent — no objects fetched)
    rpc LsRemote(LsRemoteRequest) returns (LsRemoteResponse);
}

// --- Canonical ---

message InitCanonicalRequest {
    // Path to a directory of manifests to import as the initial commit.
    // If empty, creates an empty repo with just .guildhouse/ structure.
    string import_path = 1;
    // Commit author
    string author = 2;
}

message InitCanonicalResponse {
    string commit_hash = 1;
    string message = 2;
}

message GetCanonicalHeadRequest {}

message GetCanonicalHeadResponse {
    string commit_hash = 1;
    string message = 2;
    string author = 3;
    google.protobuf.Timestamp timestamp = 4;
    uint32 total_files = 5;
}

// --- Session workspace lifecycle ---

message CreateWorkspaceRequest {
    string session_id = 1;
    // Branch to base the workspace on (default: "main")
    string base_branch = 2;
    // Git author for commits in this workspace
    string author_name = 3;
    string author_email = 4;
    // If true, workspace is read-only (no branch created, just a checkout)
    bool read_only = 5;
}

message CreateWorkspaceResponse {
    // Filesystem path to the workspace root
    string workspace_path = 1;
    // Git branch name (empty if read_only)
    string branch_name = 2;
    // SHA of the base commit
    string base_commit = 3;
}

message GetWorkspaceStatusRequest {
    string session_id = 1;
}

message GetWorkspaceStatusResponse {
    string session_id = 1;
    string branch_name = 2;
    string base_commit = 3;
    string head_commit = 4;
    uint32 commits_ahead = 5;
    uint32 files_changed = 6;
    uint32 insertions = 7;
    uint32 deletions = 8;
    bool has_uncommitted_changes = 9;
    bool read_only = 10;
}

message DestroyWorkspaceRequest {
    string session_id = 1;
}

message DestroyWorkspaceResponse {
    bool success = 1;
    string message = 2;
}

// --- Diff and commit ---

message GetDiffRequest {
    string session_id = 1;
    // If true: diff uncommitted changes only (workspace vs HEAD)
    // If false: diff entire branch vs base (session branch vs main)
    bool uncommitted_only = 2;
}

message GetDiffResponse {
    repeated FileDiff files = 1;
    string base_ref = 2;
    string head_ref = 3;
    uint32 total_insertions = 4;
    uint32 total_deletions = 5;
}

message FileDiff {
    string path = 1;
    // "added", "modified", "deleted", "renamed"
    string status = 2;
    // Unified diff text (empty for binary files)
    string diff_text = 3;
    uint32 insertions = 4;
    uint32 deletions = 5;
    // For renames: the old path
    string old_path = 6;
}

message StageFilesRequest {
    string session_id = 1;
    // File paths to stage (relative to workspace root).
    // Empty = stage all changes (git add -A).
    repeated string paths = 2;
}

message StageFilesResponse {
    uint32 files_staged = 1;
}

message CommitRequest {
    string session_id = 1;
    string message = 2;
    // Override author (if empty, uses the author from CreateWorkspace)
    string author_name = 3;
    string author_email = 4;
}

message CommitResponse {
    string commit_hash = 1;
    uint32 files_committed = 2;
    string message = 3;
}

message GetLogRequest {
    string session_id = 1;
    // Max number of commits to return (default: 20)
    uint32 limit = 2;
}

message GetLogResponse {
    repeated CommitEntry commits = 1;
}

message CommitEntry {
    string hash = 1;
    string short_hash = 2;
    string message = 3;
    string author_name = 4;
    string author_email = 5;
    google.protobuf.Timestamp timestamp = 6;
    uint32 files_changed = 7;
}

// --- Abandon ---

message AbandonRequest {
    string session_id = 1;
}

message AbandonResponse {
    bool success = 1;
    uint32 commits_discarded = 2;
    string message = 3;
}

// --- List workspaces ---

message ListWorkspacesRequest {}

message ListWorkspacesResponse {
    repeated WorkspaceSummary workspaces = 1;
}

message WorkspaceSummary {
    string session_id = 1;
    string branch_name = 2;
    string base_commit = 3;
    string head_commit = 4;
    uint32 commits_ahead = 5;
    bool has_uncommitted_changes = 6;
    bool read_only = 7;
    google.protobuf.Timestamp created_at = 8;
}

// --- Archive ---

message GetArchiveRequest {
    // Commit hash to archive (empty = HEAD)
    string commit_hash = 1;
    // Subset of paths to include (empty = all files)
    repeated string paths = 2;
}

message ArchiveChunk {
    bytes data = 1;
}

// --- Remote sync ---

message PushToRemoteRequest {
    // Name of the remote (must exist in .guildhouse/remotes.yaml)
    string remote_name = 1;
    // Local branch to push (default: "main")
    string branch = 2;
    // Force push — always false in Phase 3
    bool force = 3;
}

message PushToRemoteResponse {
    bool success = 1;
    // Remote ref that was updated (e.g. "refs/heads/main")
    string remote_ref = 2;
    // Commit hash that was pushed
    string commit_hash = 3;
    string error = 4;
}

message FetchFromRemoteRequest {
    // Name of the remote (must exist in .guildhouse/remotes.yaml)
    string remote_name = 1;
    // Ref patterns to fetch (e.g. "refs/pull/*/head").
    // If empty, uses fetch_refs from remotes.yaml config.
    repeated string ref_patterns = 2;
}

message FetchFromRemoteResponse {
    repeated FetchedRef refs_fetched = 1;
    string error = 2;
}

message FetchedRef {
    // Local ref name (e.g. "inbound/github-origin/pull/42/head")
    string ref_name = 1;
    // Commit hash at the tip of this ref
    string commit_hash = 2;
    // True if this is a newly fetched ref (not previously seen)
    bool is_new = 3;
}

message ListRemotesRequest {}

message ListRemotesResponse {
    repeated RemoteInfo remotes = 1;
}

message RemoteInfo {
    string name = 1;
    string url = 2;
    // "github", "forgejo", or "gitlab"
    string provider = 3;
    string push_branch = 4;
    // Last commit hash successfully pushed to this remote (empty if never pushed)
    string last_push_hash = 5;
    // Last time a fetch was performed from this remote
    google.protobuf.Timestamp last_fetch_time = 6;
}

message GetRemoteSyncStatusRequest {
    string remote_name = 1;
}

message GetRemoteSyncStatusResponse {
    string remote_name = 1;
    string canonical_head = 2;
    string remote_head = 3;
    uint32 commits_ahead = 4;
    uint32 commits_behind = 5;
    google.protobuf.Timestamp last_push = 6;
    google.protobuf.Timestamp last_fetch = 7;
}

message ReportStatusRequest {
    // Name of the remote (determines provider + credentials)
    string remote_name = 1;
    // Commit SHA to report status for
    string commit_hash = 2;
    // Status state: "pending", "success", "failure", "error"
    string state = 3;
    // Context label (e.g. "guildhouse/pipeline")
    string context = 4;
    // Human-readable description
    string description = 5;
    // URL to link to (e.g. pipeline run URL)
    string target_url = 6;
    // Attestation hash (hex-encoded) to include in description
    string attestation_hash = 7;
}

message ReportStatusResponse {
    bool success = 1;
    // URL of the created status check (provider-specific)
    string url = 2;
    string error = 3;
}

// --- Merge operations ---

message MergeToCanonicalRequest {
    // Branch name to merge (e.g. "inbound/github-origin/pull/42/head")
    string branch_name = 1;
    // Merge commit message
    string merge_message = 2;
    // Author for the merge commit
    string author_name = 3;
    string author_email = 4;
    // Ceremony ID if the merge was approved via Accord
    string ceremony_id = 5;
}

message MergeToCanonicalResponse {
    bool success = 1;
    // New HEAD commit hash after merge
    string new_head = 2;
    // "fast_forward" or "merge_commit"
    string merge_type = 3;
    // Error message (empty on success)
    string error = 4;
    // Number of files changed in the merge
    uint32 files_changed = 5;
}

message CleanupInboundBranchRequest {
    // Branch name to clean up
    string branch_name = 1;
}

message CleanupInboundBranchResponse {
    bool success = 1;
    string message = 2;
}

message ListInboundBranchesRequest {
    // Optional: filter by remote name
    string remote_name = 1;
}

message ListInboundBranchesResponse {
    repeated InboundBranchInfo branches = 1;
}

message InboundBranchInfo {
    string branch_name = 1;
    string commit_hash = 2;
    string remote_name = 3;
    // Original ref (e.g. "pull/42/head")
    string original_ref = 4;
}

// --- Lightweight remote ref check ---

message LsRemoteRequest {
    // Name of the remote
    string remote_name = 1;
    // Ref patterns to query (e.g. "refs/heads/main")
    repeated string refs = 2;
}

message LsRemoteResponse {
    repeated RemoteRef refs = 1;
    string error = 2;
}

message RemoteRef {
    string ref_name = 1;
    string commit_hash = 2;
}