/**
 * process 存储 adapter —— Drizzle 只准出现在 adapter(编码规范 §5.3)。
 */
import { and, asc, desc, eq, isNull } from 'drizzle-orm';
import type { ProcessPackage, TerminalState, WorkflowState } from '@contracts';
import { approvalTemplateSchema, processPackageSchema } from '@contracts';
import type { Db } from '@shared/db.ts';
import type { ProcessStore, WorkflowRecord } from '../../port.ts';
import type { NodeInstance } from '../domain/owner-resolution.ts';
import { approvalTemplateTable, nodeInstanceTable, processPackageTable, workflowTable, nodeOwnerTable } from './process-schema.ts';

type WorkflowRow = typeof workflowTable.$inferSelect;

function toWorkflow(row: WorkflowRow): WorkflowRecord {
  return {
    id: row.id,
    packageId: row.packageId,
    packageVersion: row.packageVersion,
    subject: row.subject,
    state: row.state as WorkflowState,
    source: row.source as WorkflowRecord['source'],
    initiation: row.initiation as Record<string, unknown>,
    ...(row.workGroup === null ? {} : { workGroup: row.workGroup as Record<string, string> }),
    ...(row.assignments === null ? {} : { assignments: row.assignments as Record<string, string> }),
    ports: row.ports as Record<string, Record<string, unknown>>,
    vars: row.vars as Record<string, unknown>,
    startedAt: row.startedAt.toISOString(),
    ...(row.finishedAt === null ? {} : { finishedAt: row.finishedAt.toISOString() }),
  };
}

export function createProcessStore(db: Db): ProcessStore {
  return {
    /*
     * **只插不改**:版本一旦落库就是不可变的历史。
     * 版本号由用例层算(恒新增),所以这里不该撞键;真撞了就让唯一约束报出来 ——
     * 静默覆盖会改掉在途任务正在读的定义,那是最不该无声发生的事。
     */
    async savePackage(pkg: ProcessPackage) {
      await db
        .insert(processPackageTable)
        .values({ id: pkg.id, version: pkg.version, name: pkg.name, state: pkg.state, definition: pkg });
    },

    async setPackageState(id, version, state) {
      const rows = await db
        .select()
        .from(processPackageTable)
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, version)))
        .limit(1);
      const row = rows[0];
      if (row === undefined) return;
      // state 在列上与 definition(jsonb)里各有一份 —— 读包走 definition,列供查询;两处必须一起改
      const definition = { ...(row.definition as Record<string, unknown>), state };
      await db
        .update(processPackageTable)
        .set({ state, definition })
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, version)));
    },

    async deletePackage(id, version) {
      await db
        .delete(processPackageTable)
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, version)));
    },

    async renameVersion(id, version, name) {
      // 名字在列上与 definition(jsonb)里各有一份 —— 与 setPackageState 同一口径,两处一起改
      const rows = await db
        .select()
        .from(processPackageTable)
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, version)));
      const row = rows[0];
      if (row === undefined) return; // 用例层已挡「版本不存在」,这里不静默造行
      const definition = { ...(row.definition as Record<string, unknown>), name };
      await db
        .update(processPackageTable)
        .set({ name, definition })
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, version)));
    },

    async renumberVersion(id, from, to) {
      const rows = await db
        .select()
        .from(processPackageTable)
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, from)));
      const row = rows[0];
      if (row === undefined) return; // 用例层已挡「版本不存在」
      const definition = { ...(row.definition as Record<string, unknown>), version: to };
      await db
        .update(processPackageTable)
        .set({ version: to, definition })
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, from)));
      // 跑过的单跟着改指 —— 同一份定义,只是名牌换了号;不搬引用才会让留痕指错
      await db
        .update(workflowTable)
        .set({ packageVersion: to })
        .where(and(eq(workflowTable.packageId, id), eq(workflowTable.packageVersion, from)));
    },

    async listApprovalTemplates() {
      const rows = await db.select().from(approvalTemplateTable).orderBy(asc(approvalTemplateTable.name));
      return rows.map((r) => approvalTemplateSchema.parse({
        id: r.id,
        name: r.name,
        basis: r.basis,
        ...(r.nudge === null ? {} : { nudge: r.nudge }),
        ...(r.message === null ? {} : { message: r.message }),
      }));
    },

    async upsertApprovalTemplate(template) {
      const values = {
        id: template.id,
        name: template.name,
        basis: template.basis,
        nudge: template.nudge ?? null,
        message: template.message ?? null,
        updatedAt: new Date(),
      };
      await db.insert(approvalTemplateTable).values(values).onConflictDoUpdate({
        target: approvalTemplateTable.id,
        set: { name: values.name, basis: values.basis, nudge: values.nudge, message: values.message, updatedAt: values.updatedAt },
      });
    },

    async deleteApprovalTemplate(id) {
      await db.delete(approvalTemplateTable).where(eq(approvalTemplateTable.id, id));
    },

    async getPackage(id, version) {
      const conditions = [eq(processPackageTable.id, id)];
      if (version !== undefined) conditions.push(eq(processPackageTable.version, version));
      const rows = await db
        .select()
        .from(processPackageTable)
        .where(and(...conditions))
        .orderBy(desc(processPackageTable.version))
        .limit(1);
      return rows[0] === undefined ? undefined : processPackageSchema.parse(rows[0].definition);
    },

    async listPackages() {
      const rows = await db.select().from(processPackageTable).orderBy(asc(processPackageTable.name));
      return rows.map((r) => processPackageSchema.parse(r.definition));
    },

    async updatePackageDefinition(id, version, pkg) {
      const hit = await db
        .update(processPackageTable)
        .set({ definition: pkg })
        .where(and(eq(processPackageTable.id, id), eq(processPackageTable.version, version)))
        .returning({ version: processPackageTable.version });
      if (hit.length === 0) throw new Error(`就地写回失败:流程包版本不存在 ${id}@${version}`);
    },

    async countPinnedInFlight(id, version) {
      const rows = await db
        .select({ id: workflowTable.id })
        .from(workflowTable)
        .where(
          and(
            eq(workflowTable.packageId, id),
            eq(workflowTable.packageVersion, version),
            isNull(workflowTable.finishedAt),
          ),
        );
      return rows.length;
    },

    async insertWorkflow(record) {
      await db.insert(workflowTable).values({
        id: record.id,
        packageId: record.packageId,
        packageVersion: record.packageVersion,
        subject: record.subject,
        state: record.state,
        source: record.source,
        initiation: record.initiation,
        workGroup: record.workGroup ?? null,
        assignments: record.assignments ?? null,
        ports: record.ports,
        vars: record.vars,
        startedAt: new Date(record.startedAt),
      });
    },

    async getWorkflow(id) {
      const rows = await db.select().from(workflowTable).where(eq(workflowTable.id, id)).limit(1);
      return rows[0] === undefined ? undefined : toWorkflow(rows[0]);
    },

    async listWorkflows(limit) {
      const rows = await db.select().from(workflowTable).orderBy(desc(workflowTable.startedAt)).limit(limit);
      return rows.map(toWorkflow);
    },

    async updateWorkflow(id, patch) {
      const values: Record<string, unknown> = {};
      if (patch.state !== undefined) values['state'] = patch.state;
      if (patch.ports !== undefined) values['ports'] = patch.ports;
      if (patch.vars !== undefined) values['vars'] = patch.vars;
      if (patch.finishedAt !== undefined) values['finishedAt'] = new Date(patch.finishedAt);
      const [row] = await db.update(workflowTable).set(values).where(eq(workflowTable.id, id)).returning();
      if (row === undefined) throw new Error(`工作流不存在:${id}`);
      return toWorkflow(row);
    },

    async listInstances(workflowId) {
      const rows = await db
        .select()
        .from(nodeInstanceTable)
        .where(eq(nodeInstanceTable.workflowId, workflowId))
        .orderBy(asc(nodeInstanceTable.createdAt));
      return rows.map(
        (r): NodeInstance => ({
          nodeId: r.nodeId,
          instance: r.instance,
          running: r.running,
          waiting: r.waiting,
          activated: r.activated,
          ...(r.terminal === null ? {} : { terminal: r.terminal as TerminalState }),
          ...(r.failureDigested === null ? {} : { failureDigested: r.failureDigested }),
          ...(r.taskId === null ? {} : { taskId: r.taskId }),
          ...(r.approvalId === null ? {} : { approvalId: r.approvalId }),
          // 派给谁:审批箱收件、员工面链条、治理列表全按它认人 —— 写了不读回来等于没写
          ...(r.assigneeId === null ? {} : { assigneeId: r.assigneeId }),
        }),
      );
    },

    async insertInstance(workflowId, instance) {
      await db.insert(nodeInstanceTable).values({
        workflowId,
        nodeId: instance.nodeId,
        instance: instance.instance,
        running: instance.running,
        waiting: instance.waiting,
        activated: instance.activated,
        terminal: instance.terminal ?? null,
        failureDigested: instance.failureDigested ?? null,
        taskId: instance.taskId ?? null,
        approvalId: instance.approvalId ?? null,
        assigneeId: instance.assigneeId ?? null,
      });
    },

    async updateInstance(workflowId, nodeId, instance, patch) {
      const values: Record<string, unknown> = {};
      if (patch.running !== undefined) values['running'] = patch.running;
      if (patch.waiting !== undefined) values['waiting'] = patch.waiting;
      if (patch.terminal !== undefined) values['terminal'] = patch.terminal;
      if (patch.failureDigested !== undefined) values['failureDigested'] = patch.failureDigested;
      if (patch.taskId !== undefined) values['taskId'] = patch.taskId;
      if (Object.keys(values).length === 0) return;
      await db
        .update(nodeInstanceTable)
        .set(values)
        .where(
          and(
            eq(nodeInstanceTable.workflowId, workflowId),
            eq(nodeInstanceTable.nodeId, nodeId),
            eq(nodeInstanceTable.instance, instance),
          ),
        );
    },

    async nodeOwners(packageId) {
      const rows = await db.select().from(nodeOwnerTable).where(eq(nodeOwnerTable.packageId, packageId));
      return Object.fromEntries(rows.map((r) => [r.nodeId, r.staffId]));
    },
    async setNodeOwner(packageId, nodeId, staffId) {
      // 一节点至多一位运营负责人:先清后写;undefined = 撤掉,回到轮值
      await db.delete(nodeOwnerTable).where(and(eq(nodeOwnerTable.packageId, packageId), eq(nodeOwnerTable.nodeId, nodeId)));
      if (staffId !== undefined) await db.insert(nodeOwnerTable).values({ packageId, nodeId, staffId });
    },

    async findInstanceByTask(taskId) {
      const rows = await db
        .select()
        .from(nodeInstanceTable)
        .where(eq(nodeInstanceTable.taskId, taskId))
        .limit(1);
      const row = rows[0];
      return row === undefined ? undefined : { workflowId: row.workflowId, nodeId: row.nodeId, instance: row.instance };
    },
  };
}