-- CreateEnum
CREATE TYPE "RoleCode" AS ENUM ('employee', 'manager', 'ceo', 'finance', 'finance_mgr', 'administration', 'hr', 'admin');

-- CreateEnum
CREATE TYPE "EmployeeStatus" AS ENUM ('active', 'archived');

-- CreateEnum
CREATE TYPE "DelegationGrantScope" AS ENUM ('reimbursement_submit', 'all');

-- CreateEnum
CREATE TYPE "ReimbursementStatus" AS ENUM ('draft', 'reviewing', 'approved', 'paid', 'rejected', 'cancelled');

-- CreateEnum
CREATE TYPE "InvoicePoolStatus" AS ENUM ('pending_ocr', 'ocr_failed', 'available', 'bound', 'archived');

-- CreateEnum
CREATE TYPE "InvoiceArchivedReason" AS ENUM ('used_complete', 'unused_timeout', 'manual');

-- CreateEnum
CREATE TYPE "OcrProvider" AS ENUM ('tencent');

-- CreateEnum
CREATE TYPE "OcrType" AS ENUM ('vat', 'train', 'flight', 'taxi', 'general');

-- CreateEnum
CREATE TYPE "DocumentResetPeriod" AS ENUM ('none', 'daily', 'monthly', 'yearly');

-- CreateEnum
CREATE TYPE "WorkflowInstanceStatus" AS ENUM ('pending', 'approved', 'rejected', 'cancelled', 'terminated');

-- CreateEnum
CREATE TYPE "WorkflowTaskStatus" AS ENUM ('pending', 'completed', 'rejected', 'cancelled', 'skipped');

-- CreateEnum
CREATE TYPE "WorkflowTaskOutcome" AS ENUM ('approved', 'rejected', 'returned', 'start', 'transfer', 'skipped');

-- CreateEnum
CREATE TYPE "ApprovalTransferStatus" AS ENUM ('active', 'cancelled');

-- CreateEnum
CREATE TYPE "ExpenseCategory" AS ENUM ('travel', 'rd', 'production', 'office', 'business', 'assets', 'other');

-- CreateTable
CREATE TABLE "departments" (
    "id" UUID NOT NULL,
    "name" TEXT NOT NULL,
    "parent_id" UUID,
    "archived_at" TIMESTAMP(3),
    "archived_by" UUID,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

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

-- CreateTable
CREATE TABLE "employees" (
    "id" UUID NOT NULL,
    "employee_no" TEXT NOT NULL,
    "name" TEXT NOT NULL,
    "phone" TEXT NOT NULL,
    "email" TEXT NOT NULL,
    "department_id" UUID NOT NULL,
    "title" TEXT NOT NULL,
    "direct_manager_id" UUID NOT NULL,
    "hire_date" DATE NOT NULL,
    "status" "EmployeeStatus" NOT NULL DEFAULT 'active',
    "bank_account_encrypted" TEXT NOT NULL,
    "bank_name" TEXT NOT NULL,
    "id_number_encrypted" TEXT,
    "password_hash" TEXT NOT NULL,
    "token_version" INTEGER NOT NULL DEFAULT 0,
    "archived_at" TIMESTAMP(3),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

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

-- CreateTable
CREATE TABLE "employee_roles" (
    "employee_id" UUID NOT NULL,
    "role_code" "RoleCode" NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,

    CONSTRAINT "employee_roles_pkey" PRIMARY KEY ("employee_id","role_code")
);

-- CreateTable
CREATE TABLE "delegation_grants" (
    "id" UUID NOT NULL,
    "principal_employee_id" UUID NOT NULL,
    "delegate_employee_id" UUID NOT NULL,
    "scope" "DelegationGrantScope" NOT NULL,
    "valid_from" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "valid_to" TIMESTAMP(3),
    "revoked_at" TIMESTAMP(3),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,

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

-- CreateTable
CREATE TABLE "auth_sessions" (
    "id" UUID NOT NULL,
    "employee_id" UUID NOT NULL,
    "refresh_token_hash" TEXT NOT NULL,
    "device_fingerprint" TEXT NOT NULL,
    "ip_address" TEXT NOT NULL,
    "user_agent" TEXT NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "last_seen_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "expires_at" TIMESTAMP(3) NOT NULL,
    "revoked_at" TIMESTAMP(3),

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

-- CreateTable
CREATE TABLE "audit_logs" (
    "id" UUID NOT NULL,
    "request_id" TEXT NOT NULL,
    "actor_id" UUID NOT NULL,
    "action" TEXT NOT NULL,
    "target_type" TEXT NOT NULL,
    "target_id" UUID,
    "ip_address" TEXT,
    "user_agent" TEXT,
    "extra" JSONB NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateTable
CREATE TABLE "expense_types" (
    "id" UUID NOT NULL,
    "code" TEXT NOT NULL,
    "name" TEXT NOT NULL,
    "description" TEXT,
    "category" "ExpenseCategory" NOT NULL,
    "sort_order" INTEGER NOT NULL,
    "account_code_default" TEXT,
    "is_system_default" BOOLEAN NOT NULL DEFAULT false,
    "enabled" BOOLEAN NOT NULL DEFAULT true,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

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

-- CreateTable
CREATE TABLE "document_sequences" (
    "document_type" TEXT NOT NULL,
    "prefix" TEXT NOT NULL,
    "date_format" TEXT NOT NULL,
    "separator" TEXT NOT NULL,
    "number_length" INTEGER NOT NULL DEFAULT 4,
    "reset_period" "DocumentResetPeriod" NOT NULL,
    "current_number" INTEGER NOT NULL DEFAULT 0,
    "last_reset_date" TIMESTAMP(3),
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

    CONSTRAINT "document_sequences_pkey" PRIMARY KEY ("document_type")
);

-- CreateTable
CREATE TABLE "reimbursement_forms" (
    "id" UUID NOT NULL,
    "form_number" TEXT,
    "submitter_id" UUID NOT NULL,
    "owner_id" UUID NOT NULL,
    "department_id" UUID NOT NULL,
    "reimbursement_date" DATE NOT NULL,
    "total_amount" DECIMAL(14,2) NOT NULL DEFAULT 0,
    "status" "ReimbursementStatus" NOT NULL DEFAULT 'draft',
    "description" TEXT,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

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

-- CreateTable
CREATE TABLE "reimbursement_items" (
    "id" UUID NOT NULL,
    "reimbursement_id" UUID NOT NULL,
    "expense_type_id" UUID NOT NULL,
    "expense_date" DATE NOT NULL,
    "amount" DECIMAL(14,2) NOT NULL,
    "description" TEXT NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

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

-- CreateTable
CREATE TABLE "ocr_results" (
    "id" UUID NOT NULL,
    "file_sha256" TEXT NOT NULL,
    "ocr_provider" "OcrProvider" NOT NULL DEFAULT 'tencent',
    "ocr_type" "OcrType" NOT NULL,
    "result_json" JSONB NOT NULL,
    "confidence" INTEGER,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateTable
CREATE TABLE "invoice_pool" (
    "id" UUID NOT NULL,
    "owner_employee_id" UUID NOT NULL,
    "uploaded_by_employee_id" UUID NOT NULL,
    "storage_path" TEXT NOT NULL,
    "original_name" TEXT NOT NULL,
    "mime_type" TEXT NOT NULL,
    "file_size" INTEGER NOT NULL,
    "file_sha256" TEXT NOT NULL,
    "status" "InvoicePoolStatus" NOT NULL DEFAULT 'pending_ocr',
    "archived_reason" "InvoiceArchivedReason",
    "archived_at" TIMESTAMP(3),
    "linked_reimbursement_id" UUID,
    "linked_item_id" UUID,
    "remarks" TEXT,
    "ocr_provider" "OcrProvider" NOT NULL DEFAULT 'tencent',
    "ocr_type" "OcrType" NOT NULL DEFAULT 'general',
    "ocr_result_id" UUID,
    "ocr_attempts" INTEGER NOT NULL DEFAULT 0,
    "ocr_last_error" TEXT,
    "ocr_completed_at" TIMESTAMP(3),
    "invoice_code" TEXT,
    "invoice_number" TEXT,
    "invoice_date" DATE,
    "seller_name" TEXT,
    "buyer_name" TEXT,
    "amount" DECIMAL(14,2),
    "tax_amount" DECIMAL(14,2),
    "total_amount" DECIMAL(14,2),
    "is_duplicate_override" BOOLEAN NOT NULL DEFAULT false,
    "override_ref_form_number" TEXT,
    "override_reason" TEXT,
    "overridden_by" UUID,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

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

-- CreateTable
CREATE TABLE "workflow_definitions" (
    "id" UUID NOT NULL,
    "name" TEXT NOT NULL,
    "entity_type" TEXT NOT NULL,
    "definition_json" JSONB NOT NULL,
    "version" INTEGER NOT NULL,
    "is_active" BOOLEAN NOT NULL DEFAULT true,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,

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

-- CreateTable
CREATE TABLE "workflow_instances" (
    "id" UUID NOT NULL,
    "workflow_id" UUID NOT NULL,
    "entity_type" TEXT NOT NULL,
    "entity_id" UUID NOT NULL,
    "submitter_id" UUID NOT NULL,
    "current_status" "WorkflowInstanceStatus" NOT NULL DEFAULT 'pending',
    "current_step_id" TEXT NOT NULL,
    "context_data" JSONB NOT NULL,
    "started_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "completed_at" TIMESTAMP(3),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,
    "context_department_id" UUID,

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

-- CreateTable
CREATE TABLE "workflow_tasks" (
    "id" UUID NOT NULL,
    "instance_id" UUID NOT NULL,
    "step_id" TEXT NOT NULL,
    "step_name" TEXT NOT NULL,
    "assignee_id" UUID,
    "assignee_role" "RoleCode",
    "status" "WorkflowTaskStatus" NOT NULL DEFAULT 'pending',
    "outcome" "WorkflowTaskOutcome",
    "comment" TEXT,
    "due_date" TIMESTAMP(3),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "completed_at" TIMESTAMP(3),
    "completed_by" UUID,

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

-- CreateTable
CREATE TABLE "workflow_history" (
    "id" UUID NOT NULL,
    "instance_id" UUID NOT NULL,
    "task_id" UUID,
    "actor_id" UUID NOT NULL,
    "action" TEXT NOT NULL,
    "comment" TEXT,
    "payload" JSONB,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateTable
CREATE TABLE "approval_rules" (
    "id" UUID NOT NULL,
    "name" TEXT NOT NULL,
    "min_amount" DECIMAL(14,2) NOT NULL,
    "max_amount" DECIMAL(14,2),
    "level1_role" "RoleCode" NOT NULL,
    "level2_role" "RoleCode",
    "level3_role" "RoleCode",
    "enabled" BOOLEAN NOT NULL DEFAULT true,
    "priority" INTEGER NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,
    "updated_at" TIMESTAMP(3) NOT NULL,
    "updated_by" UUID,

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

-- CreateTable
CREATE TABLE "approval_transfers" (
    "id" UUID NOT NULL,
    "reimbursement_id" UUID NOT NULL,
    "from_approver_id" UUID NOT NULL,
    "to_approver_id" UUID NOT NULL,
    "reason" TEXT NOT NULL,
    "status" "ApprovalTransferStatus" NOT NULL DEFAULT 'active',
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "created_by" UUID,

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

-- CreateIndex
CREATE INDEX "departments_parent_id_idx" ON "departments"("parent_id");

-- CreateIndex
CREATE UNIQUE INDEX "employees_employee_no_key" ON "employees"("employee_no");

-- CreateIndex
CREATE UNIQUE INDEX "employees_phone_key" ON "employees"("phone");

-- CreateIndex
CREATE UNIQUE INDEX "employees_email_key" ON "employees"("email");

-- CreateIndex
CREATE INDEX "employees_department_id_idx" ON "employees"("department_id");

-- CreateIndex
CREATE INDEX "employees_direct_manager_id_idx" ON "employees"("direct_manager_id");

-- CreateIndex
CREATE INDEX "delegation_grants_principal_employee_id_idx" ON "delegation_grants"("principal_employee_id");

-- CreateIndex
CREATE INDEX "delegation_grants_delegate_employee_id_idx" ON "delegation_grants"("delegate_employee_id");

-- CreateIndex
CREATE INDEX "auth_sessions_employee_id_idx" ON "auth_sessions"("employee_id");

-- CreateIndex
CREATE INDEX "auth_sessions_expires_at_idx" ON "auth_sessions"("expires_at");

-- CreateIndex
CREATE INDEX "auth_sessions_revoked_at_idx" ON "auth_sessions"("revoked_at");

-- CreateIndex
CREATE INDEX "audit_logs_request_id_idx" ON "audit_logs"("request_id");

-- CreateIndex
CREATE INDEX "audit_logs_actor_id_created_at_idx" ON "audit_logs"("actor_id", "created_at");

-- CreateIndex
CREATE UNIQUE INDEX "expense_types_code_key" ON "expense_types"("code");

-- CreateIndex
CREATE INDEX "expense_types_enabled_sort_order_idx" ON "expense_types"("enabled", "sort_order");

-- CreateIndex
CREATE UNIQUE INDEX "reimbursement_forms_form_number_key" ON "reimbursement_forms"("form_number");

-- CreateIndex
CREATE INDEX "reimbursement_forms_owner_id_idx" ON "reimbursement_forms"("owner_id");

-- CreateIndex
CREATE INDEX "reimbursement_forms_submitter_id_idx" ON "reimbursement_forms"("submitter_id");

-- CreateIndex
CREATE INDEX "reimbursement_forms_department_id_idx" ON "reimbursement_forms"("department_id");

-- CreateIndex
CREATE INDEX "reimbursement_forms_status_idx" ON "reimbursement_forms"("status");

-- CreateIndex
CREATE INDEX "reimbursement_forms_reimbursement_date_idx" ON "reimbursement_forms"("reimbursement_date");

-- CreateIndex
CREATE INDEX "reimbursement_items_reimbursement_id_idx" ON "reimbursement_items"("reimbursement_id");

-- CreateIndex
CREATE INDEX "reimbursement_items_expense_type_id_idx" ON "reimbursement_items"("expense_type_id");

-- CreateIndex
CREATE INDEX "reimbursement_items_expense_date_idx" ON "reimbursement_items"("expense_date");

-- CreateIndex
CREATE INDEX "ocr_results_file_sha256_idx" ON "ocr_results"("file_sha256");

-- CreateIndex
CREATE UNIQUE INDEX "ocr_results_file_sha256_ocr_provider_ocr_type_key" ON "ocr_results"("file_sha256", "ocr_provider", "ocr_type");

-- CreateIndex
CREATE INDEX "invoice_pool_owner_employee_id_idx" ON "invoice_pool"("owner_employee_id");

-- CreateIndex
CREATE INDEX "invoice_pool_uploaded_by_employee_id_idx" ON "invoice_pool"("uploaded_by_employee_id");

-- CreateIndex
CREATE INDEX "invoice_pool_file_sha256_idx" ON "invoice_pool"("file_sha256");

-- CreateIndex
CREATE INDEX "invoice_pool_invoice_code_invoice_number_idx" ON "invoice_pool"("invoice_code", "invoice_number");

-- CreateIndex
CREATE INDEX "invoice_pool_status_idx" ON "invoice_pool"("status");

-- CreateIndex
CREATE INDEX "invoice_pool_linked_reimbursement_id_idx" ON "invoice_pool"("linked_reimbursement_id");

-- CreateIndex
CREATE INDEX "workflow_definitions_entity_type_is_active_idx" ON "workflow_definitions"("entity_type", "is_active");

-- CreateIndex
CREATE UNIQUE INDEX "workflow_definitions_entity_type_version_key" ON "workflow_definitions"("entity_type", "version");

-- CreateIndex
CREATE INDEX "workflow_instances_workflow_id_idx" ON "workflow_instances"("workflow_id");

-- CreateIndex
CREATE INDEX "workflow_instances_entity_type_entity_id_idx" ON "workflow_instances"("entity_type", "entity_id");

-- CreateIndex
CREATE INDEX "workflow_instances_current_status_idx" ON "workflow_instances"("current_status");

-- CreateIndex
CREATE INDEX "workflow_instances_submitter_id_idx" ON "workflow_instances"("submitter_id");

-- CreateIndex
CREATE INDEX "workflow_instances_context_department_id_idx" ON "workflow_instances"("context_department_id");

-- CreateIndex
CREATE INDEX "workflow_tasks_instance_id_idx" ON "workflow_tasks"("instance_id");

-- CreateIndex
CREATE INDEX "workflow_tasks_status_idx" ON "workflow_tasks"("status");

-- CreateIndex
CREATE INDEX "workflow_tasks_assignee_id_idx" ON "workflow_tasks"("assignee_id");

-- CreateIndex
CREATE INDEX "workflow_tasks_assignee_role_idx" ON "workflow_tasks"("assignee_role");

-- CreateIndex
CREATE INDEX "workflow_history_instance_id_created_at_idx" ON "workflow_history"("instance_id", "created_at");

-- CreateIndex
CREATE INDEX "workflow_history_task_id_idx" ON "workflow_history"("task_id");

-- CreateIndex
CREATE INDEX "workflow_history_actor_id_idx" ON "workflow_history"("actor_id");

-- CreateIndex
CREATE INDEX "approval_rules_enabled_priority_idx" ON "approval_rules"("enabled", "priority");

-- CreateIndex
CREATE INDEX "approval_transfers_reimbursement_id_idx" ON "approval_transfers"("reimbursement_id");

-- CreateIndex
CREATE INDEX "approval_transfers_from_approver_id_idx" ON "approval_transfers"("from_approver_id");

-- CreateIndex
CREATE INDEX "approval_transfers_to_approver_id_idx" ON "approval_transfers"("to_approver_id");

-- AddForeignKey
ALTER TABLE "departments" ADD CONSTRAINT "departments_parent_id_fkey" FOREIGN KEY ("parent_id") REFERENCES "departments"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "employees" ADD CONSTRAINT "employees_department_id_fkey" FOREIGN KEY ("department_id") REFERENCES "departments"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "employees" ADD CONSTRAINT "employees_direct_manager_id_fkey" FOREIGN KEY ("direct_manager_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "employee_roles" ADD CONSTRAINT "employee_roles_employee_id_fkey" FOREIGN KEY ("employee_id") REFERENCES "employees"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "delegation_grants" ADD CONSTRAINT "delegation_grants_principal_employee_id_fkey" FOREIGN KEY ("principal_employee_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "delegation_grants" ADD CONSTRAINT "delegation_grants_delegate_employee_id_fkey" FOREIGN KEY ("delegate_employee_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "auth_sessions" ADD CONSTRAINT "auth_sessions_employee_id_fkey" FOREIGN KEY ("employee_id") REFERENCES "employees"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "audit_logs" ADD CONSTRAINT "audit_logs_actor_id_fkey" FOREIGN KEY ("actor_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "reimbursement_forms" ADD CONSTRAINT "reimbursement_forms_submitter_id_fkey" FOREIGN KEY ("submitter_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "reimbursement_forms" ADD CONSTRAINT "reimbursement_forms_owner_id_fkey" FOREIGN KEY ("owner_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "reimbursement_forms" ADD CONSTRAINT "reimbursement_forms_department_id_fkey" FOREIGN KEY ("department_id") REFERENCES "departments"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "reimbursement_items" ADD CONSTRAINT "reimbursement_items_reimbursement_id_fkey" FOREIGN KEY ("reimbursement_id") REFERENCES "reimbursement_forms"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "reimbursement_items" ADD CONSTRAINT "reimbursement_items_expense_type_id_fkey" FOREIGN KEY ("expense_type_id") REFERENCES "expense_types"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "invoice_pool" ADD CONSTRAINT "invoice_pool_owner_employee_id_fkey" FOREIGN KEY ("owner_employee_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "invoice_pool" ADD CONSTRAINT "invoice_pool_uploaded_by_employee_id_fkey" FOREIGN KEY ("uploaded_by_employee_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "invoice_pool" ADD CONSTRAINT "invoice_pool_overridden_by_fkey" FOREIGN KEY ("overridden_by") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "invoice_pool" ADD CONSTRAINT "invoice_pool_ocr_result_id_fkey" FOREIGN KEY ("ocr_result_id") REFERENCES "ocr_results"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "invoice_pool" ADD CONSTRAINT "invoice_pool_linked_reimbursement_id_fkey" FOREIGN KEY ("linked_reimbursement_id") REFERENCES "reimbursement_forms"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "invoice_pool" ADD CONSTRAINT "invoice_pool_linked_item_id_fkey" FOREIGN KEY ("linked_item_id") REFERENCES "reimbursement_items"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_instances" ADD CONSTRAINT "workflow_instances_workflow_id_fkey" FOREIGN KEY ("workflow_id") REFERENCES "workflow_definitions"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_instances" ADD CONSTRAINT "workflow_instances_entity_id_fkey" FOREIGN KEY ("entity_id") REFERENCES "reimbursement_forms"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_instances" ADD CONSTRAINT "workflow_instances_submitter_id_fkey" FOREIGN KEY ("submitter_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_instances" ADD CONSTRAINT "workflow_instances_context_department_id_fkey" FOREIGN KEY ("context_department_id") REFERENCES "departments"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_tasks" ADD CONSTRAINT "workflow_tasks_instance_id_fkey" FOREIGN KEY ("instance_id") REFERENCES "workflow_instances"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_tasks" ADD CONSTRAINT "workflow_tasks_assignee_id_fkey" FOREIGN KEY ("assignee_id") REFERENCES "employees"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_tasks" ADD CONSTRAINT "workflow_tasks_completed_by_fkey" FOREIGN KEY ("completed_by") REFERENCES "employees"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_history" ADD CONSTRAINT "workflow_history_instance_id_fkey" FOREIGN KEY ("instance_id") REFERENCES "workflow_instances"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_history" ADD CONSTRAINT "workflow_history_task_id_fkey" FOREIGN KEY ("task_id") REFERENCES "workflow_tasks"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "workflow_history" ADD CONSTRAINT "workflow_history_actor_id_fkey" FOREIGN KEY ("actor_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "approval_transfers" ADD CONSTRAINT "approval_transfers_reimbursement_id_fkey" FOREIGN KEY ("reimbursement_id") REFERENCES "reimbursement_forms"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "approval_transfers" ADD CONSTRAINT "approval_transfers_from_approver_id_fkey" FOREIGN KEY ("from_approver_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "approval_transfers" ADD CONSTRAINT "approval_transfers_to_approver_id_fkey" FOREIGN KEY ("to_approver_id") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- ------------------------------------------------------------
-- Custom constraints & partial unique indexes (P0 requirements)
-- ------------------------------------------------------------

-- approval_transfers: 转审 reason≥10（P0）
ALTER TABLE "approval_transfers"
ADD CONSTRAINT "approval_transfers_reason_len_chk"
CHECK (char_length("reason") >= 10);

-- invoice_pool: 判重例外字段完整性（P0）
ALTER TABLE "invoice_pool"
ADD CONSTRAINT "invoice_pool_duplicate_override_chk"
CHECK (
  "is_duplicate_override" = false
  OR (
    "override_ref_form_number" IS NOT NULL
    AND "override_reason" IS NOT NULL
    AND char_length("override_reason") >= 10
    AND "overridden_by" IS NOT NULL
  )
);

-- invoice_pool: linked_item_id 只能在存在 linked_reimbursement_id 时出现（P0）
ALTER TABLE "invoice_pool"
ADD CONSTRAINT "invoice_pool_linked_item_requires_reimbursement_chk"
CHECK ("linked_item_id" IS NULL OR "linked_reimbursement_id" IS NOT NULL);

-- invoice_pool: 状态机不变量（P0，见规格书 4.4.2/4.4.3）
ALTER TABLE "invoice_pool"
ADD CONSTRAINT "invoice_pool_status_invariants_chk"
CHECK (
  (
    "status" IN ('pending_ocr', 'ocr_failed', 'available')
    AND "linked_reimbursement_id" IS NULL
    AND "linked_item_id" IS NULL
    AND "archived_reason" IS NULL
    AND "archived_at" IS NULL
  )
  OR (
    "status" = 'bound'
    AND "linked_reimbursement_id" IS NOT NULL
    AND "archived_reason" IS NULL
    AND "archived_at" IS NULL
  )
  OR (
    "status" = 'archived'
    AND "archived_reason" IS NOT NULL
    AND "archived_at" IS NOT NULL
    AND (
      (
        "archived_reason" = 'used_complete'
        AND "linked_reimbursement_id" IS NOT NULL
      )
      OR (
        "archived_reason" IN ('unused_timeout', 'manual')
        AND "linked_reimbursement_id" IS NULL
      )
    )
  )
);

-- invoice_pool: 全局双策略判重（只对已使用历史生效；P0 定案）
CREATE UNIQUE INDEX "invoice_pool_file_sha256_dedup_ux"
ON "invoice_pool" ("file_sha256")
WHERE (
  (
    "status" = 'bound'
    OR ("status" = 'archived' AND "archived_reason" = 'used_complete')
  )
  AND "is_duplicate_override" = false
);

CREATE UNIQUE INDEX "invoice_pool_invoice_code_number_dedup_ux"
ON "invoice_pool" ("invoice_code", "invoice_number")
WHERE (
  "invoice_code" IS NOT NULL
  AND "invoice_number" IS NOT NULL
  AND (
    "status" = 'bound'
    OR ("status" = 'archived' AND "archived_reason" = 'used_complete')
  )
  AND "is_duplicate_override" = false
);