/**
 * Shrimp basic-admin demo
 *
 * 用 MemoryShrimpCrud 跑一个零依赖的 admin server,展示:
 *  - Shrimp 核心(模块注册 / RPC dispatch / 权限树)
 *  - ShrimpTableModule + MemoryShrimpCrud 的 CRUD 自动事件
 *  - 通过 Express 暴露成完整的 hand-admin 协议:
 *      GET  /admin-api/config
 *      POST /admin-api/login
 *      GET  /admin-api/me
 *      POST /admin-api/<module>[/<sub>...]/<event>
 *
 * 不使用 ShrimpServer/Mongoose/JWT,刻意暴露 ShrimpServer 把太多东西耦合在
 * Express+Mongo+Auth 一起的事实,作为后续重构的对照样本。
 *
 * 单一 mock super-admin operator,前端登录直接放行,token 是固定字符串。
 */
import express, { type Request, type Response } from "express"
import {
    Shrimp,
    ShrimpTableModule,
    MemoryShrimpCrud,
    ShrimpFieldTypes,
    ShrimpError,
    ShrimpCode,
} from "shrimp-server"
import type {
    IFieldConfig,
    WithId,
    IShrimpOperator,
    IModuleInfo,
    IMenuItem,
    IMeResult,
} from "shrimp-server"

interface ITag { _id: string; name: string }
interface IProduct { _id: string; code: string; name: string; price: number; tagIds: string[] }

const tagFields: IFieldConfig[] = [
    { key: "name", label: "标签名", type: ShrimpFieldTypes.String, required: true, searchable: true },
]

const productFields: IFieldConfig[] = [
    { key: "code", label: "编码", type: ShrimpFieldTypes.String, required: true, editable: "addOnly" },
    { key: "name", label: "名称", type: ShrimpFieldTypes.String, required: true, searchable: true },
    { key: "price", label: "价格", type: ShrimpFieldTypes.Number, required: true },
    {
        key: "tagIds", label: "标签", type: ShrimpFieldTypes.Relation,
        relation: { moduleKey: "tag", labelKey: "name" }, multiple: true, defaultValue: [],
    },
]

const FAKE_TOKEN = "demo-super-admin-token"

const superAdmin: IShrimpOperator = {
    userId: "demo-admin",
    roleId: ["demo-super"],
    isSuperAdmin: true,
}

async function bootstrap() {
    const shrimp = new Shrimp()

    const tagCrud = new MemoryShrimpCrud<WithId<ITag>>()
    new ShrimpTableModule(shrimp, "tag", tagCrud, tagFields, "标签管理").initCrud()

    const productCrud = new MemoryShrimpCrud<WithId<IProduct>>()
    new ShrimpTableModule(shrimp, "product", productCrud, productFields, "商品管理").initCrud()

    // 种子数据
    const t1 = await tagCrud.add({ name: "热门" } as any)
    const t2 = await tagCrud.add({ name: "促销" } as any)
    await productCrud.add({ code: "P001", name: "苹果", price: 5, tagIds: [t1._id] } as any)
    await productCrud.add({ code: "P002", name: "香蕉", price: 3, tagIds: [t1._id, t2._id] } as any)

    // super admin 看得到所有模块
    const allKeys = (await shrimp.allPower()).map(p => p.key)
    const superPowers = new Set(allKeys)

    const app = express()
    app.use(express.json())

    // 简单认证: 仅检查 Authorization,通过即注入 super-admin operator
    function authedRunner(req: Request, res: Response, run: () => Promise<any>) {
        const auth = req.headers.authorization || ""
        const token = auth.replace(/^Bearer\s+/i, "")
        if (token !== FAKE_TOKEN) {
            res.json({ code: ShrimpCode.UNAUTHORIZED, tip: { t: "shrimp.relogin" } })
            return
        }
        Shrimp.asyncLocalStorage.run(superAdmin, async () => {
            try {
                const data = await run()
                res.json({ code: ShrimpCode.OK, data })
            } catch (e: any) {
                if (e instanceof ShrimpError) {
                    res.json({ code: e.code, tip: e.tip })
                } else {
                    console.error(e)
                    res.json({ code: ShrimpCode.SERVER_ERROR, log: String(e?.message || e) })
                }
            }
        })
    }

    // --- 公开接口 ---
    app.get("/admin-api/config", (_req, res) => {
        res.json({ code: ShrimpCode.OK, data: { title: "Shrimp Basic Admin Demo" } })
    })

    app.post("/admin-api/login", (req, res) => {
        const { username, password } = req.body || {}
        // demo 模式不校验密码,任意账号都给同一个 token
        if (!username || !password) {
            res.json({ code: ShrimpCode.UNAUTHORIZED, tip: { t: "shrimp.loginFailed" } })
            return
        }
        res.json({ code: ShrimpCode.OK, data: { token: FAKE_TOKEN } })
    })

    // --- 需要登录的接口 ---
    app.get("/admin-api/me", (req, res) => {
        authedRunner(req, res, async () => {
            const moduleInfo: IModuleInfo[] = shrimp.getModuleInfo(superPowers)
            const fullMenu = shrimp.getMenuTree()
            const menuTree: IMenuItem[] = shrimp.filterMenuTree(fullMenu, allKeys)
            const result: IMeResult = {
                nickname: "Demo Admin",
                moduleInfo,
                menuTree,
                options: {},
            }
            return result
        })
    })

    // RPC dispatch: POST /admin-api/<...path>  body 是参数数组
    app.post(/^\/admin-api\/.+/, (req, res) => {
        const rawPath = req.path.replace(/^\/admin-api\//, "")
        // 不要把 login/config 也接进来
        if (rawPath === "login" || rawPath === "config" || rawPath === "me") {
            res.status(404).end()
            return
        }
        authedRunner(req, res, async () => {
            const path = rawPath.split("/").filter(Boolean)
            const args = Array.isArray(req.body) ? req.body : []
            return shrimp.call(path, ...args)
        })
    })

    const port = 3100
    app.listen(port, () => {
        console.log(`Shrimp basic-admin demo: http://localhost:${port}`)
        console.log("")
        console.log("# 配合前端: cd web && npm install && npm run dev,然后访问 http://localhost:5173")
        console.log("# 登录: 任意账号密码")
        console.log("")
        console.log("# 也可以直接 curl:")
        console.log(`  TOKEN=${FAKE_TOKEN}`)
        console.log(`  curl -s -X POST http://localhost:${port}/admin-api/product/list -H 'content-type: application/json' -H "Authorization: Bearer $TOKEN" -d '[{}]' | jq`)
    })
}

bootstrap().catch(err => {
    console.error("bootstrap failed:", err)
    process.exit(1)
})