-- 入口模块租户关系表
-- 目的：
--   1. 替代 leaudit_entry_modules.areas 的硬编码地区数组
--   2. 支持新增自定义租户后为入口模块直接分配 tenant_code
--   3. 保留旧 areas 字段作为兼容读写镜像，逐步退出

BEGIN;

CREATE TABLE IF NOT EXISTS leaudit_entry_module_tenants (
    id               BIGSERIAL PRIMARY KEY,
    entry_module_id  BIGINT NOT NULL,
    tenant_code      VARCHAR(64) NOT NULL,
    tenant_name      VARCHAR(128) NULL,
    is_enabled       BOOLEAN NOT NULL DEFAULT TRUE,
    sort_order       INT NOT NULL DEFAULT 0,
    created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    deleted_at       TIMESTAMPTZ NULL,
    UNIQUE (entry_module_id, tenant_code)
);

CREATE INDEX IF NOT EXISTS idx_entry_module_tenants_module
    ON leaudit_entry_module_tenants(entry_module_id, sort_order, id)
    WHERE deleted_at IS NULL;

CREATE INDEX IF NOT EXISTS idx_entry_module_tenants_tenant
    ON leaudit_entry_module_tenants(tenant_code, is_enabled, sort_order)
    WHERE deleted_at IS NULL;

COMMENT ON TABLE leaudit_entry_module_tenants IS '入口模块与租户的多对多配置关系表';
COMMENT ON COLUMN leaudit_entry_module_tenants.entry_module_id IS '入口模块ID';
COMMENT ON COLUMN leaudit_entry_module_tenants.tenant_code IS '租户编码，引用 sys_tenants.tenant_code';
COMMENT ON COLUMN leaudit_entry_module_tenants.tenant_name IS '配置快照名称，便于前端直接展示';

INSERT INTO leaudit_entry_module_tenants (
    entry_module_id, tenant_code, tenant_name, is_enabled, sort_order, created_at, updated_at, deleted_at
)
SELECT
    em.id,
    alias_map.tenant_code,
    COALESCE(t.tenant_name, area_item->>'area') AS tenant_name,
    COALESCE((area_item->>'enabled')::boolean, TRUE) AS is_enabled,
    COALESCE((area_item->>'sort_order')::int, 0) AS sort_order,
    NOW(),
    NOW(),
    NULL
FROM leaudit_entry_modules em
CROSS JOIN LATERAL jsonb_array_elements(COALESCE(em.areas, '[]'::jsonb)) AS area_item
LEFT JOIN LATERAL (
    SELECT a.tenant_code
    FROM sys_tenant_aliases a
    WHERE a.alias_value = area_item->>'area'
      AND a.deleted_at IS NULL
      AND a.is_enabled = TRUE
    ORDER BY
        CASE a.alias_type
            WHEN 'DISPLAY' THEN 1
            WHEN 'LEGACY_AREA' THEN 2
            WHEN 'LEGACY_REGION' THEN 3
            ELSE 9
        END ASC,
        a.id ASC
    LIMIT 1
) alias_map ON TRUE
LEFT JOIN sys_tenants t
    ON t.tenant_code = alias_map.tenant_code
   AND t.deleted_at IS NULL
WHERE em.deleted_at IS NULL
  AND alias_map.tenant_code IS NOT NULL
ON CONFLICT (entry_module_id, tenant_code) DO UPDATE
SET
    tenant_name = EXCLUDED.tenant_name,
    is_enabled = EXCLUDED.is_enabled,
    sort_order = EXCLUDED.sort_order,
    updated_at = NOW(),
    deleted_at = NULL;

COMMIT;