import { mutation, query } from "./_generated/server";
import { v } from "convex/values";
import { nowIso } from "./_utils/time";

const accessScope = v.union(v.literal("private"), v.literal("shared"), v.literal("public"));

export const getMeta = query({
  args: { userId: v.string(), id: v.string() },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) return null;
    if (doc.user_id !== args.userId) return null;
    return {
      id: doc.id,
      user_id: doc.user_id,
      workspace_id: doc.workspace_id,
      access_scope: doc.access_scope,
      title: doc.title ?? null,
      parent_id: doc.parent_id ?? null,
      created_at: doc.created_at,
      updated_at: doc.updated_at ?? null,
      wide_layout: doc.wide_layout ?? null,
      use_small_text: doc.use_small_text ?? null,
      show_heading_numbers: doc.show_heading_numbers ?? null,
      show_toc: doc.show_toc ?? null,
      show_structure: doc.show_structure ?? null,
      protect_editing: doc.protect_editing ?? null,
      show_word_count: doc.show_word_count ?? null,
      word_count: doc.word_count ?? null,
      character_count: doc.character_count ?? null,
      block_count: doc.block_count ?? null,
    };
  },
});

export const getContent = query({
  args: { userId: v.string(), id: v.string() },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) return null;
    if (doc.user_id !== args.userId) return null;
    return { content: doc.content ?? null };
  },
});

export const listByWorkspace = query({
  args: { userId: v.string(), workspaceId: v.string() },
  handler: async (ctx, args) => {
    const docs = await ctx.db
      .query("documents")
      .withIndex("by_workspace", (q) => q.eq("workspace_id", args.workspaceId))
      .collect();

    // 说明：阶段 4 先不做垃圾桶（deleted_at != null），因此这里直接过滤。
    return docs
      .filter((d) => d.user_id === args.userId)
      .filter((d) => d.deleted_at == null)
      .map((d) => ({
        access_scope: d.access_scope,
        id: d.id,
        workspace_id: d.workspace_id,
        title: d.title ?? "无标题",
        parent_id: d.parent_id ?? null,
        sort_order: d.sort_order ?? null,
        is_starred: d.is_starred ?? null,
        is_template: d.is_template ?? false,
        created_at: d.created_at,
        updated_at: d.updated_at ?? null,
      }));
  },
});

export const listTrashedByWorkspace = query({
  args: { userId: v.string(), workspaceId: v.string() },
  handler: async (ctx, args) => {
    const docs = await ctx.db
      .query("documents")
      .withIndex("by_workspace", (q) => q.eq("workspace_id", args.workspaceId))
      .collect();

    return docs
      .filter((d) => d.user_id === args.userId)
      .filter((d) => d.deleted_at != null)
      .sort((a, b) => (b.deleted_at ?? "").localeCompare(a.deleted_at ?? ""))
      .slice(0, 100)
      .map((d) => ({
        id: d.id,
        title: d.title ?? null,
        parent_id: d.parent_id ?? null,
        deleted_at: d.deleted_at!,
        access_scope: d.access_scope,
      }));
  },
});

export const create = mutation({
  args: {
    userId: v.string(),
    id: v.string(),
    workspaceId: v.string(),
    parentId: v.union(v.string(), v.null()),
    title: v.optional(v.union(v.string(), v.null())),
    accessScope,
    content: v.optional(v.any()),
  },
  handler: async (ctx, args) => {
    const siblings = await ctx.db
      .query("documents")
      .withIndex("by_workspace_parent", (q) => q.eq("workspace_id", args.workspaceId).eq("parent_id", args.parentId))
      .collect();

    const sortOrder = siblings.filter((d) => d.deleted_at == null).length;
    const ts = nowIso();

    const title = (args.title ?? "无标题") || "无标题";
    const content = typeof args.content === "undefined" ? [] : args.content;

    await ctx.db.insert("documents", {
      id: args.id,
      user_id: args.userId,
      workspace_id: args.workspaceId,
      parent_id: args.parentId,
      title,
      content,
      access_scope: args.accessScope,
      sort_order: sortOrder,
      is_starred: false,
      is_template: false,

      wide_layout: false,
      use_small_text: false,
      show_heading_numbers: true,
      show_toc: false,
      show_structure: false,
      protect_editing: false,
      show_word_count: true,
      word_count: 0,
      character_count: 0,
      block_count: 0,
      created_at: ts,
      updated_at: ts,
      deleted_at: null,
      deleted_by: null,
    });

    return {
      id: args.id,
      title,
      parent_id: args.parentId,
      sort_order: sortOrder,
      is_starred: false,
      created_at: ts,
      updated_at: ts,
      workspace_id: args.workspaceId,
      access_scope: args.accessScope,
      is_template: false,
    };
  },
});

export const updateContent = mutation({
  args: { userId: v.string(), id: v.string(), content: v.any() },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");
    const ts = nowIso();
    await ctx.db.patch(doc._id, { content: args.content, updated_at: ts });
    return { ok: true, updated_at: ts };
  },
});

export const updateTitle = mutation({
  args: { userId: v.string(), id: v.string(), title: v.union(v.string(), v.null()) },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");
    const ts = nowIso();
    await ctx.db.patch(doc._id, { title: args.title, updated_at: ts });
    return { ok: true, updated_at: ts };
  },
});

export const move = mutation({
  args: {
    userId: v.string(),
    id: v.string(),
    parentId: v.union(v.string(), v.null()),
    sortOrder: v.number(),
  },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");
    const ts = nowIso();
    await ctx.db.patch(doc._id, {
      parent_id: args.parentId,
      sort_order: args.sortOrder,
      updated_at: ts,
    });
    return { ok: true, updated_at: ts };
  },
});

export const softDelete = mutation({
  args: { userId: v.string(), id: v.string() },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");
    const ts = nowIso();
    await ctx.db.patch(doc._id, { deleted_at: ts, deleted_by: args.userId, updated_at: ts });
    return { ok: true };
  },
});

export const restore = mutation({
  args: { userId: v.string(), id: v.string() },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");
    const ts = nowIso();
    await ctx.db.patch(doc._id, {
      deleted_at: null,
      deleted_by: null,
      parent_id: null,
      access_scope: "private",
      updated_at: ts,
    });
    return { ok: true };
  },
});

export const purge = mutation({
  args: { userId: v.string(), id: v.string() },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");
    await ctx.db.delete(doc._id);
    return { ok: true };
  },
});

export const emptyTrashByWorkspace = mutation({
  args: { userId: v.string(), workspaceId: v.string() },
  handler: async (ctx, args) => {
    // 说明：阶段 4/5 先用“membership 存在即可”的规则，避免引入复杂权限模型。
    const membership = await ctx.db
      .query("workspace_members")
      .withIndex("by_workspace_user", (q) => q.eq("workspace_id", args.workspaceId).eq("user_id", args.userId))
      .first();

    if (!membership) {
      throw new Error("无权操作该工作空间");
    }

    const docs = await ctx.db
      .query("documents")
      .withIndex("by_workspace", (q) => q.eq("workspace_id", args.workspaceId))
      .collect();

    const toDelete = docs.filter((d) => d.user_id === args.userId && d.deleted_at != null);
    for (const d of toDelete) {
      await ctx.db.delete(d._id);
    }

    return { ok: true, deletedCount: toDelete.length };
  },
});

export const updateOptions = mutation({
  args: {
    userId: v.string(),
    id: v.string(),
    options: v.object({
      wideLayout: v.optional(v.boolean()),
      smallText: v.optional(v.boolean()),
      showHeadingNumbers: v.optional(v.boolean()),
      showToc: v.optional(v.boolean()),
      showStructure: v.optional(v.boolean()),
      protectEditing: v.optional(v.boolean()),
      showWordCount: v.optional(v.boolean()),
    }),
  },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");

    const patch: Record<string, unknown> = {};
    if (typeof args.options.wideLayout === "boolean") patch.wide_layout = args.options.wideLayout;
    if (typeof args.options.smallText === "boolean") patch.use_small_text = args.options.smallText;
    if (typeof args.options.showHeadingNumbers === "boolean")
      patch.show_heading_numbers = args.options.showHeadingNumbers;
    if (typeof args.options.showToc === "boolean") patch.show_toc = args.options.showToc;
    if (typeof args.options.showStructure === "boolean") patch.show_structure = args.options.showStructure;
    if (typeof args.options.protectEditing === "boolean") patch.protect_editing = args.options.protectEditing;
    if (typeof args.options.showWordCount === "boolean") patch.show_word_count = args.options.showWordCount;

    if (Object.keys(patch).length === 0) {
      throw new Error("缺少可更新的选项");
    }

    const ts = nowIso();
    await ctx.db.patch(doc._id, { ...patch, updated_at: ts });
    return { ok: true, updated_at: ts };
  },
});

export const updateStats = mutation({
  args: {
    userId: v.string(),
    id: v.string(),
    wordCount: v.number(),
    characterCount: v.number(),
    blockCount: v.number(),
  },
  handler: async (ctx, args) => {
    const doc = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.id))
      .first();
    if (!doc) throw new Error("页面不存在");
    if (doc.user_id !== args.userId) throw new Error("无权限");
    const ts = nowIso();
    await ctx.db.patch(doc._id, {
      word_count: args.wordCount,
      character_count: args.characterCount,
      block_count: args.blockCount,
      updated_at: ts,
    });
    return { ok: true, updated_at: ts };
  },
});

export const duplicate = mutation({
  args: {
    userId: v.string(),
    sourceId: v.string(),
    newId: v.string(),
    title: v.optional(v.union(v.string(), v.null())),
  },
  handler: async (ctx, args) => {
    const source = await ctx.db
      .query("documents")
      .withIndex("by_document_id", (q) => q.eq("id", args.sourceId))
      .first();
    if (!source) throw new Error("页面不存在或无权限访问");
    if (source.user_id !== args.userId) throw new Error("页面不存在或无权限访问");

    const siblings = await ctx.db
      .query("documents")
      .withIndex("by_workspace_parent", (q) =>
        q.eq("workspace_id", source.workspace_id).eq("parent_id", source.parent_id),
      )
      .collect();

    const sortOrder = siblings.filter((d) => d.deleted_at == null).length;
    const ts = nowIso();
    const baseTitle = (source.title ?? "无标题").trim() ? (source.title ?? "无标题").trim() : "无标题";
    const title = (args.title ?? `${baseTitle} 副本`) || `${baseTitle} 副本`;

    await ctx.db.insert("documents", {
      id: args.newId,
      user_id: args.userId,
      workspace_id: source.workspace_id,
      parent_id: source.parent_id,
      title,
      content: source.content ?? [],
      access_scope: source.access_scope,
      sort_order: sortOrder,
      is_starred: false,
      is_template: false,

      wide_layout: source.wide_layout ?? false,
      use_small_text: source.use_small_text ?? false,
      show_heading_numbers: source.show_heading_numbers ?? true,
      show_toc: source.show_toc ?? false,
      show_structure: source.show_structure ?? false,
      protect_editing: source.protect_editing ?? false,
      show_word_count: source.show_word_count ?? true,
      word_count: source.word_count ?? 0,
      character_count: source.character_count ?? 0,
      block_count: source.block_count ?? 0,

      created_at: ts,
      updated_at: ts,
      deleted_at: null,
      deleted_by: null,
    });

    return {
      id: args.newId,
      title,
      parent_id: source.parent_id ?? null,
      sort_order: sortOrder,
      workspace_id: source.workspace_id,
      access_scope: source.access_scope,
      created_at: ts,
      updated_at: ts,
    };
  },
});

export const listAllForCopy = query({
  args: { userId: v.string(), workspaceId: v.string() },
  handler: async (ctx, args) => {
    const docs = await ctx.db
      .query("documents")
      .withIndex("by_workspace", (q) => q.eq("workspace_id", args.workspaceId))
      .collect();

    return docs
      .filter((d) => d.user_id === args.userId)
      .filter((d) => d.deleted_at == null)
      .map((d) => ({
        id: d.id,
        title: d.title ?? null,
        parent_id: d.parent_id ?? null,
        workspace_id: d.workspace_id,
        access_scope: d.access_scope,
        sort_order: d.sort_order ?? null,
        created_at: d.created_at ?? null,
        content: d.content ?? null,
      }));
  },
});