-- CreateEnum
CREATE TYPE "DictStatus" AS ENUM ('ACTIVE', 'DISABLED');

-- CreateEnum
CREATE TYPE "DictKind" AS ENUM ('TREE', 'LIST');

-- CreateTable
CREATE TABLE "system_config_versions" (
    "id" CHAR(26) NOT NULL,
    "config_key" VARCHAR(128) NOT NULL,
    "version" INTEGER NOT NULL,
    "old_value" JSONB,
    "new_value" JSONB NOT NULL,
    "reason" VARCHAR(255),
    "changed_by" CHAR(26),
    "changed_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

    CONSTRAINT "system_config_versions_pkey" PRIMARY KEY ("id")
);

-- CreateTable
CREATE TABLE "dict_types" (
    "id" CHAR(26) NOT NULL,
    "code" VARCHAR(64) NOT NULL,
    "name" VARCHAR(64) NOT NULL,
    "group_key" VARCHAR(32) NOT NULL,
    "kind" "DictKind" NOT NULL DEFAULT 'LIST',
    "description" VARCHAR(255) NOT NULL DEFAULT '',
    "industry_scoped" BOOLEAN NOT NULL DEFAULT false,
    "builtin" BOOLEAN NOT NULL DEFAULT false,
    "status" "DictStatus" NOT NULL DEFAULT 'ACTIVE',
    "sort_order" INTEGER NOT NULL DEFAULT 0,
    "created_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "updated_at" TIMESTAMPTZ(3) NOT NULL,
    "updated_by" VARCHAR(64),

    CONSTRAINT "dict_types_pkey" PRIMARY KEY ("id")
);

-- CreateTable
CREATE TABLE "dict_items" (
    "id" CHAR(26) NOT NULL,
    "type_id" CHAR(26) NOT NULL,
    "code" VARCHAR(64) NOT NULL,
    "name" VARCHAR(64) NOT NULL,
    "parent_code" VARCHAR(64),
    "industry_id" CHAR(26),
    "sort_order" INTEGER NOT NULL DEFAULT 0,
    "status" "DictStatus" NOT NULL DEFAULT 'ACTIVE',
    "remark" VARCHAR(255) NOT NULL DEFAULT '',
    "created_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "updated_at" TIMESTAMPTZ(3) NOT NULL,
    "updated_by" VARCHAR(64),

    CONSTRAINT "dict_items_pkey" PRIMARY KEY ("id")
);

-- CreateIndex
CREATE INDEX "system_config_versions_changed_at_idx" ON "system_config_versions"("changed_at");

-- CreateIndex
CREATE UNIQUE INDEX "system_config_versions_config_key_version_key" ON "system_config_versions"("config_key", "version");

-- CreateIndex
CREATE UNIQUE INDEX "dict_types_code_key" ON "dict_types"("code");

-- CreateIndex
CREATE INDEX "dict_types_group_key_sort_order_idx" ON "dict_types"("group_key", "sort_order");

-- CreateIndex
CREATE INDEX "dict_items_type_id_industry_id_sort_order_idx" ON "dict_items"("type_id", "industry_id", "sort_order");

-- CreateIndex
CREATE INDEX "dict_items_type_id_parent_code_idx" ON "dict_items"("type_id", "parent_code");

-- AddForeignKey
ALTER TABLE "system_config_versions" ADD CONSTRAINT "system_config_versions_config_key_fkey" FOREIGN KEY ("config_key") REFERENCES "system_configs"("config_key") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "dict_items" ADD CONSTRAINT "dict_items_type_id_fkey" FOREIGN KEY ("type_id") REFERENCES "dict_types"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "dict_items" ADD CONSTRAINT "dict_items_industry_id_fkey" FOREIGN KEY ("industry_id") REFERENCES "industries"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- A4 / R-10：同 type + code + 行业层唯一；industry_id 为 NULL 的通用层也必须唯一
CREATE UNIQUE INDEX "dict_items_type_code_generic_key" ON "dict_items"("type_id", "code") WHERE "industry_id" IS NULL;
CREATE UNIQUE INDEX "dict_items_type_code_industry_key" ON "dict_items"("type_id", "code", "industry_id") WHERE "industry_id" IS NOT NULL;

-- 一条条目不能把自己作为父级
ALTER TABLE "dict_items" ADD CONSTRAINT "dict_items_no_self_parent_check" CHECK ("parent_code" IS NULL OR "parent_code" <> "code");