import { computed, ref, watch } from "vue";
import { defineStore } from "pinia";
import { Events } from "@wailsio/runtime";
import { ArchiveService } from "../../bindings/pvfine/services";
import type {
  AdvancedSearchDetail,
  AdvancedSearchHit,
  AdvancedSearchIndexStatus,
} from "../../bindings/pvfine/services/models";
import { useArchiveStore } from "./archive";

export type AdvancedSearchMode = "binary" | "string" | "quick";
export type AdvancedStringMatch = "text" | "regex";

export interface AdvancedSearchItem {
  key: string;
  name: string;
  path: string;
  size: number;
  dataType: number;
  fileIndex: number;
  details: AdvancedSearchDetail[];
}

/** 高级搜索状态:弹窗隐藏时仍保留当前归档的查询与结果。 */
export const useAdvancedSearchStore = defineStore("advancedSearch", () => {
  const archive = useArchiveStore();
  const visible = ref(false);
  const mode = ref<AdvancedSearchMode>("quick");
  const exactMatch = ref(false);
  const stringMatch = ref<AdvancedStringMatch>("text");
  const query = ref("");
  const scopePath = ref("");
  const hits = ref<AdvancedSearchItem[]>([]);
  const nextCursor = ref(-1);
  const searching = ref(false);
  const stale = ref(false);
  const error = ref("");
  const indexStatus = ref<AdvancedSearchIndexStatus>({
    state: "idle",
    stage: "",
    done: 0,
    total: 0,
    error: "",
  });

  let requestId = 0;
  let retryAfterIndex = false;

  const regexEnabled = computed(() => mode.value === "string" && stringMatch.value === "regex");
  const hasResults = computed(() => hits.value.length > 0);

  function eventData(event: any): any {
    return event?.data ?? event;
  }

  function readIndexStatus(data: any): AdvancedSearchIndexStatus {
    return {
      state: String(data?.state ?? "idle"),
      stage: String(data?.stage ?? ""),
      done: Number(data?.done ?? 0),
      total: Number(data?.total ?? 0),
      error: String(data?.error ?? ""),
    };
  }

  function errorMessage(value: any): string {
    return String(value?.message ?? value ?? "高级搜索失败");
  }

  function toItem(hit: AdvancedSearchHit): AdvancedSearchItem {
    return {
      key: `${hit.fileIndex}:${hit.path}:${hit.name ?? ""}:${(hit.details ?? []).filter((detail) => detail?.kind === "id").map((detail) => detail?.value).join(",")}`,
      name: hit.name ?? "",
      path: hit.path,
      size: hit.size,
      dataType: hit.dataType,
      fileIndex: hit.fileIndex,
      details: (hit.details ?? []).filter(
        (detail): detail is AdvancedSearchDetail => !!detail
      ),
    };
  }

  function open() {
    visible.value = true;
  }

  function close() {
    visible.value = false;
  }

  function clear() {
    requestId++;
    query.value = "";
    hits.value = [];
    nextCursor.value = -1;
    searching.value = false;
    stale.value = false;
    error.value = "";
    retryAfterIndex = false;
  }

  function resetForArchive() {
    requestId++;
    visible.value = false;
    mode.value = "quick";
    exactMatch.value = false;
    stringMatch.value = "text";
    scopePath.value = "";
    clear();
    indexStatus.value = readIndexStatus(null);
  }

  async function search() {
    if (searching.value) return;
    const request = ++requestId;
    error.value = "";
    stale.value = false;
    hits.value = [];
    nextCursor.value = -1;
    retryAfterIndex = false;
    if (!query.value.trim()) {
      searching.value = false;
      return;
    }
    if (!archive.open) {
      error.value = "请先打开归档文件";
      return;
    }
    if (regexEnabled.value) {
      try {
        // 这是前端即时反馈；最终语法仍由 Go RE2 后端校验。
        new RegExp(query.value);
      } catch (value: any) {
        error.value = `正则表达式无效: ${value?.message ?? value}`;
        return;
      }
    }

    searching.value = true;
    try {
      const result = await ArchiveService.AdvancedSearch(
        mode.value === "quick" && exactMatch.value ? "quick-exact" : mode.value,
        query.value,
        scopePath.value,
        regexEnabled.value,
        0,
        200
      );
      if (request !== requestId) return;
      const page = (result?.hits ?? [])
        .filter((hit): hit is AdvancedSearchHit => !!hit)
        .map(toItem);
      hits.value = page;
      nextCursor.value = result?.nextCursor ?? -1;
    } catch (value) {
      if (request !== requestId) return;
      const message = errorMessage(value);
      error.value = message;
      retryAfterIndex = message.includes("索引正在构建");
    } finally {
      if (request === requestId) searching.value = false;
    }
  }

  async function cancel() {
    requestId++;
    retryAfterIndex = false;
    try {
      await ArchiveService.CancelAdvancedSearch();
      nextCursor.value = -1;
      indexStatus.value = readIndexStatus(null);
      stale.value = hits.value.length > 0;
    } catch (value) {
      error.value = errorMessage(value);
    } finally {
      searching.value = false;
    }
  }

  async function loadMore() {
    if (searching.value || stale.value || nextCursor.value < 0 || !query.value.trim()) return;
    const request = requestId;
    searching.value = true;
    error.value = "";
    try {
      const result = await ArchiveService.AdvancedSearch(
        mode.value === "quick" && exactMatch.value ? "quick-exact" : mode.value,
        query.value,
        scopePath.value,
        regexEnabled.value,
        nextCursor.value,
        200
      );
      if (request !== requestId) return;
      const page = (result?.hits ?? [])
        .filter((hit): hit is AdvancedSearchHit => !!hit)
        .map(toItem);
      hits.value.push(...page);
      nextCursor.value = result?.nextCursor ?? -1;
    } catch (value) {
      if (request === requestId) error.value = errorMessage(value);
    } finally {
      if (request === requestId) searching.value = false;
    }
  }

  /** 加载剩余分页，调用方在成功后再一次性使用完整结果。 */
  async function loadAll(): Promise<AdvancedSearchItem[] | null> {
    if (searching.value || !query.value.trim()) return [...hits.value];
    if (stale.value) return null;
    const request = requestId;
    searching.value = true;
    error.value = "";
    try {
      let cursor = nextCursor.value;
      while (cursor >= 0) {
        const result = await ArchiveService.AdvancedSearch(
          mode.value === "quick" && exactMatch.value ? "quick-exact" : mode.value,
          query.value,
          scopePath.value,
          regexEnabled.value,
          cursor,
          200
        );
        if (request !== requestId || stale.value) return null;
        const page = (result?.hits ?? [])
          .filter((hit): hit is AdvancedSearchHit => !!hit)
          .map(toItem);
        hits.value.push(...page);
        const next = result?.nextCursor ?? -1;
        nextCursor.value = next;
        if (next === cursor) break;
        cursor = next;
      }
      return [...hits.value];
    } catch (value) {
      if (request === requestId) error.value = errorMessage(value);
      throw value;
    } finally {
      if (request === requestId) searching.value = false;
    }
  }

  function markStale() {
    requestId++;
    searching.value = false;
    nextCursor.value = -1;
    indexStatus.value = readIndexStatus(null);
    if (query.value.trim() || hits.value.length > 0) stale.value = true;
  }

  watch([mode, query, scopePath, stringMatch, exactMatch], () => {
    requestId++;
    searching.value = false;
    retryAfterIndex = false;
    nextCursor.value = -1;
    if (hits.value.length > 0) stale.value = true;
  }, { flush: "sync" });

  Events.On("archive:index-ready", () => {
    if (mode.value === "quick" && retryAfterIndex && visible.value) {
      retryAfterIndex = false;
      void search();
    }
  });

  Events.On("archive:opened", () => resetForArchive());
  Events.On("archive:closed", () => resetForArchive());
  Events.On("archive:advanced-search-stale", () => markStale());
  Events.On("archive:advanced-index-progress", (event: any) => {
    indexStatus.value = readIndexStatus(eventData(event));
  });
  Events.On("archive:advanced-index-ready", (event: any) => {
    indexStatus.value = readIndexStatus(eventData(event));
    if (retryAfterIndex && visible.value) {
      retryAfterIndex = false;
      void search();
    }
  });
  Events.On("archive:advanced-index-error", (event: any) => {
    indexStatus.value = readIndexStatus(eventData(event));
  });

  return {
    visible,
    mode,
    stringMatch,
    exactMatch,
    query,
    scopePath,
    hits,
    nextCursor,
    searching,
    stale,
    error,
    indexStatus,
    regexEnabled,
    hasResults,
    open,
    close,
    clear,
    search,
    cancel,
    loadMore,
    loadAll,
  };
});