-- ==========================================
-- Chat Switchboard — 002 Teams & Access Control
-- ==========================================
-- Teams, team membership, groups (ACLs), and group membership.
-- ICD §15 (Teams & Access Control)
-- ==========================================

-- =========================================
-- TEAMS
-- =========================================

CREATE TABLE IF NOT EXISTS teams (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name        VARCHAR(200) NOT NULL UNIQUE,
    description TEXT DEFAULT '',
    created_by  UUID NOT NULL REFERENCES users(id) ON DELETE RESTRICT,
    is_active   BOOLEAN DEFAULT true,
    settings    JSONB DEFAULT '{}'::jsonb,
    created_at  TIMESTAMPTZ DEFAULT NOW(),
    updated_at  TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_teams_active ON teams(is_active) WHERE is_active = true;
DROP TRIGGER IF EXISTS teams_updated_at ON teams;
CREATE TRIGGER teams_updated_at BEFORE UPDATE ON teams
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

COMMENT ON COLUMN teams.settings IS 'Team policies: {"require_private_providers": false}';

CREATE TABLE IF NOT EXISTS team_members (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    team_id     UUID NOT NULL REFERENCES teams(id) ON DELETE CASCADE,
    user_id     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role        VARCHAR(20) NOT NULL DEFAULT 'member'
                CHECK (role IN ('admin', 'member')),
    joined_at   TIMESTAMPTZ DEFAULT NOW(),
    UNIQUE(team_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_team_members_team ON team_members(team_id);
CREATE INDEX IF NOT EXISTS idx_team_members_user ON team_members(user_id);


-- =========================================
-- GROUPS (ACLs)
-- =========================================
-- Pure access-control lists. Decouple resource visibility from team membership.

CREATE TABLE IF NOT EXISTS groups (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name        VARCHAR(100) NOT NULL,
    description TEXT NOT NULL DEFAULT '',
    scope       VARCHAR(20) NOT NULL DEFAULT 'global'
                CHECK (scope IN ('global', 'team')),
    team_id     UUID REFERENCES teams(id) ON DELETE CASCADE,
    created_by  UUID NOT NULL REFERENCES users(id),
    created_at  TIMESTAMPTZ DEFAULT NOW(),
    updated_at  TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT groups_scope_team CHECK (
        (scope = 'global' AND team_id IS NULL) OR
        (scope = 'team' AND team_id IS NOT NULL)
    )
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_groups_name_scope
    ON groups(name, COALESCE(team_id, '00000000-0000-0000-0000-000000000000'));

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

COMMENT ON TABLE groups IS 'Access-control groups. Decouple resource visibility from team membership.';
COMMENT ON COLUMN groups.scope IS 'global: admin-managed, can span teams. team: team-admin-managed, team-internal.';

CREATE TABLE IF NOT EXISTS group_members (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    group_id    UUID NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
    user_id     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    added_by    UUID NOT NULL REFERENCES users(id),
    added_at    TIMESTAMPTZ DEFAULT NOW(),
    UNIQUE(group_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_group_members_group ON group_members(group_id);
CREATE INDEX IF NOT EXISTS idx_group_members_user ON group_members(user_id);