CREATE TYPE workspace_role AS ENUM ('owner', 'admin', 'member');

CREATE TABLE workspaces (
    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name       TEXT NOT NULL,
    slug       TEXT NOT NULL UNIQUE,
    owner_id   UUID NOT NULL REFERENCES users(id),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    deleted_at TIMESTAMPTZ
);

CREATE TABLE workspace_members (
    workspace_id UUID          NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
    user_id      UUID          NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role         workspace_role NOT NULL DEFAULT 'member',
    display_name TEXT,
    avatar_url   TEXT,
    joined_at    TIMESTAMPTZ   NOT NULL DEFAULT NOW(),
    PRIMARY KEY (workspace_id, user_id)
);

CREATE TABLE workspace_invitations (
    id           UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    workspace_id UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
    created_by   UUID NOT NULL REFERENCES users(id),
    token        TEXT NOT NULL UNIQUE,
    max_uses     INT,
    use_count    INT NOT NULL DEFAULT 0,
    expires_at   TIMESTAMPTZ,
    created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX workspace_members_user_id_idx ON workspace_members(user_id);