-- +goose Up
-- +goose StatementBegin
CREATE TABLE IF NOT EXISTS tenant_invites(
    id bigserial PRIMARY KEY,
    tenant_id bigint NOT NULL,
    user_id bigint NOT NULL,
    code varchar(64) NOT NULL,
    status varchar(32) NOT NULL DEFAULT 'active',
    max_uses int NOT NULL DEFAULT 0,
    used_count int NOT NULL DEFAULT 0,
    expires_at timestamptz,
    disabled_at timestamptz,
    disabled_operator_user_id bigint,
    remark varchar(255) NOT NULL DEFAULT '',
    created_at timestamptz NOT NULL DEFAULT NOW(),
    updated_at timestamptz NOT NULL DEFAULT NOW(),
    UNIQUE (tenant_id, code)
);

-- tenant_invites：租户邀请（用于用户通过邀请码加入租户）
COMMENT ON TABLE tenant_invites IS '租户邀请：租户管理员生成的邀请码；用户可通过 code 加入租户；支持禁用、过期、使用次数限制；所有查询/写入必须限定 tenant_id';
COMMENT ON COLUMN tenant_invites.id IS '主键ID：自增';
COMMENT ON COLUMN tenant_invites.tenant_id IS '租户ID：多租户隔离关键字段；所有查询/写入必须限定 tenant_id';
COMMENT ON COLUMN tenant_invites.user_id IS '创建人用户ID：生成邀请码的租户管理员（审计用）';
COMMENT ON COLUMN tenant_invites.code IS '邀请码：用户加入租户时提交；同一租户内唯一';
COMMENT ON COLUMN tenant_invites.status IS '邀请状态：active/disabled/expired；expired 也可由 expires_at 推导，业务侧需保持一致';
COMMENT ON COLUMN tenant_invites.max_uses IS '最大可使用次数：0 表示不限制；>0 时 used_count 达到该值后视为失效';
COMMENT ON COLUMN tenant_invites.used_count IS '已使用次数：每次成功加入时 +1；需事务保证并发下不超发';
COMMENT ON COLUMN tenant_invites.expires_at IS '过期时间：到期后不可再使用（UTC）；为空表示不过期';
COMMENT ON COLUMN tenant_invites.disabled_at IS '禁用时间：租户管理员禁用该邀请的时间（UTC）';
COMMENT ON COLUMN tenant_invites.disabled_operator_user_id IS '禁用操作人用户ID：租户管理员（审计用）';
COMMENT ON COLUMN tenant_invites.remark IS '备注：生成/禁用原因等（审计用）';
COMMENT ON COLUMN tenant_invites.created_at IS '创建时间：默认 now()';
COMMENT ON COLUMN tenant_invites.updated_at IS '更新时间：默认 now()';

CREATE INDEX IF NOT EXISTS ix_tenant_invites_tenant_status ON tenant_invites(tenant_id, status);
CREATE INDEX IF NOT EXISTS ix_tenant_invites_tenant_expires_at ON tenant_invites(tenant_id, expires_at);

CREATE TABLE IF NOT EXISTS tenant_join_requests(
    id bigserial PRIMARY KEY,
    tenant_id bigint NOT NULL,
    user_id bigint NOT NULL,
    status varchar(32) NOT NULL DEFAULT 'pending',
    reason varchar(255) NOT NULL DEFAULT '',
    decided_at timestamptz,
    decided_operator_user_id bigint,
    decided_reason varchar(255) NOT NULL DEFAULT '',
    created_at timestamptz NOT NULL DEFAULT NOW(),
    updated_at timestamptz NOT NULL DEFAULT NOW()
);

-- tenant_join_requests：加入租户申请（用于无邀请码场景的人工审核）
COMMENT ON TABLE tenant_join_requests IS '加入申请：用户申请加入租户，租户管理员审核通过/拒绝；所有查询/写入必须限定 tenant_id';
COMMENT ON COLUMN tenant_join_requests.id IS '主键ID：自增';
COMMENT ON COLUMN tenant_join_requests.tenant_id IS '租户ID：多租户隔离关键字段；所有查询/写入必须限定 tenant_id';
COMMENT ON COLUMN tenant_join_requests.user_id IS '申请人用户ID：发起加入申请的用户';
COMMENT ON COLUMN tenant_join_requests.status IS '申请状态：pending/approved/rejected；状态变更需记录 decided_at 与 decided_operator_user_id';
COMMENT ON COLUMN tenant_join_requests.reason IS '申请原因：用户填写的加入说明（可选）';
COMMENT ON COLUMN tenant_join_requests.decided_at IS '处理时间：审核通过/拒绝时记录（UTC）';
COMMENT ON COLUMN tenant_join_requests.decided_operator_user_id IS '处理人用户ID：租户管理员（审计用）';
COMMENT ON COLUMN tenant_join_requests.decided_reason IS '处理说明：管理员通过/拒绝的原因（可选，审计用）';
COMMENT ON COLUMN tenant_join_requests.created_at IS '创建时间：默认 now()';
COMMENT ON COLUMN tenant_join_requests.updated_at IS '更新时间：默认 now()';

-- 约束：同一用户同一租户同一时间仅允许存在一个 pending 申请，避免重复提交淹没审核队列。
CREATE UNIQUE INDEX IF NOT EXISTS ux_tenant_join_requests_tenant_user_pending ON tenant_join_requests(tenant_id, user_id) WHERE status = 'pending';
CREATE INDEX IF NOT EXISTS ix_tenant_join_requests_tenant_status ON tenant_join_requests(tenant_id, status);
CREATE INDEX IF NOT EXISTS ix_tenant_join_requests_tenant_created_at ON tenant_join_requests(tenant_id, created_at);

-- +goose StatementEnd
-- +goose Down
-- +goose StatementBegin
DROP INDEX IF EXISTS ix_tenant_join_requests_tenant_created_at;
DROP INDEX IF EXISTS ix_tenant_join_requests_tenant_status;
DROP INDEX IF EXISTS ux_tenant_join_requests_tenant_user_pending;
DROP TABLE IF EXISTS tenant_join_requests;

DROP INDEX IF EXISTS ix_tenant_invites_tenant_expires_at;
DROP INDEX IF EXISTS ix_tenant_invites_tenant_status;
DROP TABLE IF EXISTS tenant_invites;
-- +goose StatementEnd