-- ==========================================
-- Chat Switchboard — 009 Workspaces & Git
-- ==========================================
-- File workspaces, workspace file index, semantic chunks, git credentials.
-- ICD §7 (Workspaces & Git)
-- ==========================================

-- =========================================
-- WORKSPACES
-- =========================================

CREATE TABLE IF NOT EXISTS workspaces (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    owner_type      VARCHAR(20) NOT NULL
                    CHECK (owner_type IN ('user', 'project', 'channel', 'team')),
    owner_id        UUID NOT NULL,
    name            VARCHAR(200) NOT NULL,
    root_path       TEXT NOT NULL,
    max_bytes       BIGINT,
    status          VARCHAR(20) NOT NULL DEFAULT 'active'
                    CHECK (status IN ('active', 'archived', 'deleting')),
    indexing_enabled BOOLEAN NOT NULL DEFAULT true,
    -- Git integration (v0.21.4)
    git_remote_url    TEXT,
    git_branch        TEXT,
    git_credential_id UUID,
    git_last_sync     TIMESTAMPTZ,
    created_at      TIMESTAMPTZ DEFAULT NOW(),
    updated_at      TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_workspaces_owner ON workspaces(owner_type, owner_id);
CREATE INDEX IF NOT EXISTS idx_workspaces_status ON workspaces(status) WHERE status != 'deleting';
DROP TRIGGER IF EXISTS workspaces_updated_at ON workspaces;
CREATE TRIGGER workspaces_updated_at BEFORE UPDATE ON workspaces
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

COMMENT ON TABLE workspaces IS 'File workspaces bound to users, projects, channels, or teams';
COMMENT ON COLUMN workspaces.root_path IS 'PVC-relative path to workspace root directory';


-- =========================================
-- WORKSPACE FILES
-- =========================================

CREATE TABLE IF NOT EXISTS workspace_files (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    workspace_id    UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
    path            TEXT NOT NULL,
    is_directory    BOOLEAN NOT NULL DEFAULT false,
    content_type    VARCHAR(100),
    size_bytes      BIGINT NOT NULL DEFAULT 0,
    sha256          VARCHAR(64),
    index_status    VARCHAR(20) DEFAULT 'pending'
                    CHECK (index_status IN ('pending', 'indexing', 'ready', 'error', 'skipped')),
    chunk_count     INT NOT NULL DEFAULT 0,
    created_at      TIMESTAMPTZ DEFAULT NOW(),
    updated_at      TIMESTAMPTZ DEFAULT NOW()
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_workspace_files_path
    ON workspace_files(workspace_id, path);
CREATE INDEX IF NOT EXISTS idx_workspace_files_workspace ON workspace_files(workspace_id);
CREATE INDEX IF NOT EXISTS idx_workspace_files_type
    ON workspace_files(workspace_id, content_type) WHERE content_type IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_workspace_files_index_status
    ON workspace_files(workspace_id, index_status)
    WHERE index_status IN ('pending', 'indexing');

DROP TRIGGER IF EXISTS workspace_files_updated_at ON workspace_files;
CREATE TRIGGER workspace_files_updated_at BEFORE UPDATE ON workspace_files
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

COMMENT ON TABLE workspace_files IS 'Metadata index for workspace files — filesystem is source of truth';


-- =========================================
-- WORKSPACE CHUNKS (v0.21.2)
-- =========================================

CREATE TABLE IF NOT EXISTS workspace_chunks (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    workspace_id    UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
    file_id         UUID NOT NULL REFERENCES workspace_files(id) ON DELETE CASCADE,
    chunk_index     INT NOT NULL,
    content         TEXT NOT NULL,
    token_count     INT NOT NULL DEFAULT 0,
    embedding       vector(3072),
    metadata        JSONB DEFAULT '{}',
    created_at      TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_workspace_chunks_file ON workspace_chunks(file_id);
CREATE INDEX IF NOT EXISTS idx_workspace_chunks_workspace ON workspace_chunks(workspace_id);

COMMENT ON TABLE workspace_chunks IS 'Text chunks with vector embeddings for workspace file semantic search';


-- =========================================
-- GIT CREDENTIALS (v0.21.4)
-- =========================================

CREATE TABLE IF NOT EXISTS git_credentials (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id         UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    name            TEXT NOT NULL DEFAULT '',
    auth_type       TEXT NOT NULL DEFAULT 'https_pat',
    encrypted_data  BYTEA NOT NULL DEFAULT '',
    nonce           BYTEA NOT NULL DEFAULT '',
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_git_credentials_user ON git_credentials(user_id);

-- Deferred FK: workspaces.git_credential_id → git_credentials.id
DO $$ BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint WHERE conname = 'fk_workspaces_git_credential'
    ) THEN
        ALTER TABLE workspaces ADD CONSTRAINT fk_workspaces_git_credential
            FOREIGN KEY (git_credential_id) REFERENCES git_credentials(id) ON DELETE SET NULL;
    END IF;
END $$;