import type {
  ApiEnvelope,
  PublisherBindRequest,
  PublisherBindResponse,
  PublisherLocalPlatformState,
  PublisherPluginPingResponse,
  PublisherPublishArticleRequest,
  PublisherPublishResponse,
  PublisherPublishTaskResult,
  PublisherRegisterInstallationPayload,
  PublisherRegisterInstallationResult,
} from "@geo/shared-types";

import { browser } from "wxt/browser";

import { detectPlatformState, publishViaAdapter } from "./adapters";
import { buildPublishedUrl } from "./platforms";
import { getExtensionState, patchExtensionState } from "./storage";

type PublisherAction = "ping" | "detectPlatforms" | "registerInstallation" | "bindAccount" | "publishArticle";

function normalizeBaseUrl(baseUrl: string): string {
  return baseUrl.endsWith("/") ? baseUrl : `${baseUrl}/`;
}

function normalizeText(value?: string | null): string | null {
  const trimmed = value?.trim();
  return trimmed ? trimmed : null;
}

function logPublishRuntime(level: "info" | "warn" | "error", event: string, payload: Record<string, unknown>): void {
  const prefix = `[geo-publisher] ${event}`;
  if (level === "error") {
    console.error(prefix, payload);
    return;
  }
  if (level === "warn") {
    console.warn(prefix, payload);
    return;
  }
  console.info(prefix, payload);
}

function normalizeUrl(value?: string | null, platformId?: string | null, externalArticleId?: string | null): string | null {
  const explicit = normalizeText(value);
  if (explicit) {
    return explicit;
  }
  if (!platformId || !externalArticleId) {
    return null;
  }
  return normalizeText(buildPublishedUrl(platformId, externalArticleId));
}

async function postCallback<T>(
  baseUrl: string,
  path: string,
  payload: Record<string, unknown>,
): Promise<T> {
  const state = await getExtensionState();
  const response = await fetch(new URL(path.replace(/^\//, ""), normalizeBaseUrl(baseUrl)).toString(), {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      ...(state.installation_token ? { "X-Geo-Installation-Token": state.installation_token } : {}),
      ...(state.plugin_installation_id ? { "X-Geo-Installation-Id": String(state.plugin_installation_id) } : {}),
    },
    body: JSON.stringify(payload),
  });

  const body = (await response.json()) as ApiEnvelope<T> | { message?: string };
  if (!response.ok || !("data" in body)) {
    throw new Error(body.message || "publisher_callback_failed");
  }
  return body.data;
}

function asFailedAdapterResult(error: unknown) {
  const message = error instanceof Error ? error.message : "publisher_adapter_failed";
  return {
    success: false,
    status: "failed" as const,
    externalArticleId: null,
    externalArticleUrl: null,
    externalManageUrl: null,
    message,
    responsePayload: {
      mode: "platform-adapter",
      error: message,
      stack: error instanceof Error ? error.stack ?? null : null,
    },
  };
}

async function postPublishCallback(
  callbackBaseUrl: string,
  payload: PublisherPublishArticleRequest,
  task: PublisherPublishArticleRequest["tasks"][number],
  adapterResult: {
    success: boolean;
    status: PublisherPublishTaskResult["status"];
    externalArticleId?: string | null;
    externalArticleUrl?: string | null;
    externalManageUrl?: string | null;
    message?: string | null;
    responsePayload?: Record<string, unknown>;
  },
) {
  const externalArticleId = normalizeText(adapterResult.externalArticleId);
  const externalArticleUrl = normalizeUrl(adapterResult.externalArticleUrl, task.platform_id, externalArticleId);
  const externalManageUrl = normalizeText(adapterResult.externalManageUrl);

  await postCallback(callbackBaseUrl, "/api/callback/plugin/publish", {
    plugin_session_id: task.plugin_session_id,
    session_token: task.session_token,
    article_id: payload.article_id,
    publish_record_id: task.publish_record_id,
    platform_account_id: task.platform_account_id,
    platform_id: task.platform_id,
    status: adapterResult.status,
    external_article_id: externalArticleId,
    external_article_url: externalArticleUrl,
    external_manage_url: externalManageUrl,
    published_at: adapterResult.success ? new Date().toISOString() : null,
    error_message: adapterResult.success ? null : adapterResult.message,
    client_version: browser.runtime.getManifest().version,
    request_payload: {
      title: payload.title,
      cover_asset_url: normalizeText(payload.cover_asset_url),
      publish_type: payload.publish_type,
    },
    response_payload: adapterResult.responsePayload ?? {
      mode: "platform-adapter",
    },
  });

  return {
    publish_record_id: task.publish_record_id,
    platform_account_id: task.platform_account_id,
    platform_id: task.platform_id,
    success: adapterResult.success,
    status: adapterResult.status,
    external_article_id: externalArticleId,
    external_article_url: externalArticleUrl,
    external_manage_url: externalManageUrl,
    message: adapterResult.message ?? null,
  } satisfies PublisherPublishTaskResult;
}

export async function handlePublisherAction(
  action: PublisherAction,
  payload?: unknown,
): Promise<
  | PublisherPluginPingResponse
  | PublisherLocalPlatformState[]
  | PublisherRegisterInstallationResult
  | PublisherBindResponse
  | PublisherPublishResponse
> {
  switch (action) {
    case "ping":
      return handlePing();
    case "detectPlatforms":
      return handleDetectPlatforms();
    case "registerInstallation":
      return handleRegisterInstallation(payload as PublisherRegisterInstallationPayload);
    case "bindAccount":
      return handleBindAccount(payload as PublisherBindRequest);
    case "publishArticle":
      return handlePublishArticle(payload as PublisherPublishArticleRequest);
    default:
      throw new Error("publisher_action_not_supported");
  }
}

async function handlePing(): Promise<PublisherPluginPingResponse> {
  const state = await getExtensionState();
  return {
    installed: true,
    version: browser.runtime.getManifest().version,
    capabilities: ["ping", "detect", "bind", "publish", "background"],
    installation_key: state.installation_key,
    plugin_installation_id: state.plugin_installation_id,
  };
}

async function handleDetectPlatforms() {
  const state = await getExtensionState();
  const detected = await Promise.all(state.platforms.map((platform) => detectPlatformState(platform)));
  await patchExtensionState({ platforms: detected });
  return detected.map((platform) => ({
    platform_id: platform.platform_id,
    connected: platform.connected,
    platform_uid: platform.platform_uid ?? null,
    nickname: platform.nickname ?? null,
    avatar_url: platform.avatar_url ?? null,
    message: platform.message ?? null,
  }));
}

async function handleRegisterInstallation(
  payload: PublisherRegisterInstallationPayload,
): Promise<PublisherRegisterInstallationResult> {
  await patchExtensionState({
    plugin_installation_id: payload.plugin_installation_id,
    installation_token: payload.installation_token,
    api_base_url: payload.api_base_url,
  });

  return {
    success: true,
    plugin_installation_id: payload.plugin_installation_id,
  };
}

async function handleBindAccount(payload: PublisherBindRequest): Promise<PublisherBindResponse> {
  const state = await getExtensionState();
  const rawPlatform = state.platforms.find((item) => item.platform_id === payload.platform_id);
  const platform = rawPlatform ? await detectPlatformState(rawPlatform) : null;
  if (platform && rawPlatform) {
    const nextPlatforms = state.platforms.map((item) => (item.platform_id === platform.platform_id ? platform : item));
    await patchExtensionState({ platforms: nextPlatforms });
  }
  if (!platform?.connected) {
    if (payload.login_url) {
      await browser.tabs.create({ url: payload.login_url });
    }
    return {
      success: false,
      platform_id: payload.platform_id,
      message: "No local session detected for this platform. Configure it in the extension popup first.",
    };
  }

  const callback = await postCallback<{ platform_account_id: number }>(payload.callback_base_url, "/api/callback/plugin/bind", {
    plugin_session_id: payload.plugin_session_id,
    session_token: payload.session_token,
    platform_id: payload.platform_id,
    platform_uid: platform.platform_uid,
    nickname: platform.nickname,
    avatar_url: platform.avatar_url,
    status: "active",
    client_version: browser.runtime.getManifest().version,
    metadata: {
      installation_key: state.installation_key,
      plugin_installation_id: state.plugin_installation_id,
    },
  });

  return {
    success: true,
    platform_id: payload.platform_id,
    platform_uid: platform.platform_uid ?? null,
    nickname: platform.nickname ?? null,
    avatar_url: platform.avatar_url ?? null,
    platform_account_id: callback.platform_account_id,
    message: "Platform account bound successfully.",
  };
}

async function handlePublishArticle(payload: PublisherPublishArticleRequest): Promise<PublisherPublishResponse> {
  const state = await getExtensionState();
  const results: PublisherPublishTaskResult[] = [];

  for (const task of payload.tasks) {
    const platform = state.platforms.find((item) => item.platform_id === task.platform_id);
    const adapterResult = await publishViaAdapter(task.platform_id, {
      article: payload,
      task,
    }).catch(asFailedAdapterResult);

    if (adapterResult) {
      if (!adapterResult.success) {
        logPublishRuntime("error", "publish-task-failed", {
          article_id: payload.article_id,
          publish_record_id: task.publish_record_id,
          platform_account_id: task.platform_account_id,
          platform_id: task.platform_id,
          message: adapterResult.message ?? null,
          response_payload: adapterResult.responsePayload ?? null,
        });
      }
      results.push(await postPublishCallback(payload.callback_base_url, payload, task, adapterResult));
      continue;
    }

    const fallbackFailure = !platform?.connected
      ? {
          success: false,
          status: "failed" as const,
          externalArticleId: null,
          externalArticleUrl: null,
          externalManageUrl: normalizeText(platform?.login_url),
          message: "Local platform session is missing in the extension runtime.",
          responsePayload: {
            mode: "missing-session",
            installation_key: state.installation_key,
          },
        }
      : {
          success: false,
          status: "failed" as const,
          externalArticleId: null,
          externalArticleUrl: null,
          externalManageUrl: normalizeText(platform.login_url),
          message: "No direct-publish adapter is available for this platform yet.",
          responsePayload: {
            mode: "missing-adapter",
            installation_key: state.installation_key,
          },
        };

    logPublishRuntime("warn", "publish-task-rejected", {
      article_id: payload.article_id,
      publish_record_id: task.publish_record_id,
      platform_account_id: task.platform_account_id,
      platform_id: task.platform_id,
      reason: fallbackFailure.message,
      response_payload: fallbackFailure.responsePayload,
    });
    results.push(await postPublishCallback(payload.callback_base_url, payload, task, fallbackFailure));
  }

  const successCount = results.filter((item) => item.success).length;
  const failedCount = results.length - successCount;

  return {
    success: successCount > 0,
    batch_status: failedCount === 0 ? "success" : successCount > 0 ? "partial_success" : "failed",
    results,
  };
}