import { z } from "zod";

const runtimeBoolean = (defaultValue: boolean) =>
  z
    .enum(["true", "false"])
    .default(defaultValue ? "true" : "false")
    .transform((value) => value === "true");

const browserHttpUrl = z
  .string()
  .url()
  .superRefine((value, context) => {
    const url = new URL(value);
    if (!["http:", "https:"].includes(url.protocol)) {
      context.addIssue({ code: z.ZodIssueCode.custom, message: "仅支持 HTTP(S) 地址" });
    }
    if (url.username || url.password) {
      context.addIssue({ code: z.ZodIssueCode.custom, message: "浏览器运行时地址不能包含凭据" });
    }
    if (url.hash) {
      context.addIssue({ code: z.ZodIssueCode.custom, message: "浏览器运行时地址不能包含片段" });
    }
  });

const optionalBrowserHttpUrl = z
  .string()
  .trim()
  .default("")
  .superRefine((value, context) => {
    if (!value) return;
    const parsed = browserHttpUrl.safeParse(value);
    if (!parsed.success) {
      context.addIssue({ code: z.ZodIssueCode.custom, message: "必须是安全的 HTTP(S) 地址" });
    }
  })
  .transform((value) => value.replace(/\/+$/, ""));

const keycloakIssuer = z
  .string()
  .trim()
  .default("")
  .superRefine((value, context) => {
    if (!value) return;
    const parsed = browserHttpUrl.safeParse(value);
    if (!parsed.success) {
      context.addIssue({
        code: z.ZodIssueCode.custom,
        message: "Keycloak issuer 必须是安全的 HTTP(S) 地址"
      });
      return;
    }
    const url = new URL(value);
    if (url.search || !/\/realms\/[^/]+\/?$/.test(url.pathname)) {
      context.addIssue({
        code: z.ZodIssueCode.custom,
        message: "Keycloak issuer 必须指向具体 Realm"
      });
    }
  })
  .transform((value) => value.replace(/\/+$/, ""));

const runtimeConfigSchema = z
  .object({
    TJWATER_AUTH_MODE: z.enum(["required", "disabled"]).default("required"),
    TJWATER_KEYCLOAK_ISSUER: keycloakIssuer,
    TJWATER_KEYCLOAK_CLIENT_ID: z.string().trim().default("next-tjwater"),
    TJWATER_MAPBOX_ACCESS_TOKEN: z.string().default(""),
    TJWATER_TIANDITU_TOKEN: z.string().default(""),
    TJWATER_MAP_URL: browserHttpUrl.default("https://geoserver.waternetwork.cn/geoserver"),
    TJWATER_GEOSERVER_WORKSPACE: z.string().trim().min(1).default("tjwater_next"),
    TJWATER_SERVER_API_BASE_URL: browserHttpUrl.default("http://127.0.0.1:8000"),
    TJWATER_AGENT_URL: browserHttpUrl.default("http://127.0.0.1:8787"),
    TJWATER_WORKBENCH_RUNTIME_MODE: z.enum(["auto", "demo", "history", "backend"]).default("auto"),
    TJWATER_PERIPHERAL_SAMPLE_API_BASE_URL: optionalBrowserHttpUrl,
    TJWATER_PERIPHERAL_SAMPLE_TIME_MODE: z.enum(["demo", "recent"]).default("demo"),
    TJWATER_PERIPHERAL_SAMPLE_DEMO_START: z
      .string()
      .datetime({ offset: true })
      .default("2026-09-17T00:00:00Z"),
    TJWATER_PERIPHERAL_SAMPLE_DEMO_END: z
      .string()
      .datetime({ offset: true })
      .default("2026-09-17T12:00:00Z"),
    TJWATER_PERIPHERAL_SAMPLE_RECENT_HOURS: z.coerce.number().int().min(1).max(168).default(8),
    TJWATER_ENABLE_DEV_PANEL: runtimeBoolean(false),
    TJWATER_ENABLE_MSW: runtimeBoolean(false)
  })
  .superRefine((config, context) => {
    const demoStart = Date.parse(config.TJWATER_PERIPHERAL_SAMPLE_DEMO_START);
    const demoEnd = Date.parse(config.TJWATER_PERIPHERAL_SAMPLE_DEMO_END);
    if (demoEnd <= demoStart || demoEnd - demoStart > 7 * 24 * 60 * 60 * 1000) {
      context.addIssue({
        code: z.ZodIssueCode.custom,
        path: ["TJWATER_PERIPHERAL_SAMPLE_DEMO_END"],
        message: "外围演示窗口必须晚于开始时间且不超过 7 天"
      });
    }
    if (config.TJWATER_AUTH_MODE !== "required") return;
    if (!config.TJWATER_KEYCLOAK_ISSUER) {
      context.addIssue({
        code: z.ZodIssueCode.custom,
        path: ["TJWATER_KEYCLOAK_ISSUER"],
        message: "启用认证时必须配置 Keycloak issuer"
      });
    }
    if (!config.TJWATER_KEYCLOAK_CLIENT_ID) {
      context.addIssue({
        code: z.ZodIssueCode.custom,
        path: ["TJWATER_KEYCLOAK_CLIENT_ID"],
        message: "启用认证时必须配置 Keycloak client ID"
      });
    }
  });

declare global {
  var __TJWATER_CONFIG__: unknown;
}

export type RuntimeConfig = z.infer<typeof runtimeConfigSchema>;

export function parseRuntimeConfig(value: unknown): RuntimeConfig {
  return runtimeConfigSchema.parse(value ?? {});
}

export const env = parseRuntimeConfig(globalThis.__TJWATER_CONFIG__);