"use server";

import * as z from "zod";

import type { AutosaveResponse } from "@/lib/editor/autosave";
import {
  createNamedRevision,
  saveDataSourceVersion,
  savePageDraft,
} from "@/lib/content/mutations";
import { dataSourceSnapshotSchema } from "@/lib/content/data-source";
import { slugSchema } from "@/lib/content/lifecycle";
import type { DataSourceSnapshot, PageSnapshot } from "@/lib/content/types";
import { requireAdmin } from "@/lib/auth/server";
import { builtInTemplates } from "@/lib/templates";
import { persistTemplateApplication } from "@/lib/templates/persist";
import {
  createGuide,
  GuideVersionConflictError,
  permanentlyDeleteGuide,
  restoreGuide,
  runCatalogSync,
  saveArtifacts,
  saveConstellations,
  saveExtraSections,
  saveTeams,
  setGuideVisibility,
  saveWeapons,
  trashGuide,
  updateGuideBasics,
} from "@/lib/guides/mutations";

const serializedBlockSchema = z.strictObject({
  id: z.string().uuid(),
  type: z.string().min(1).max(64),
  schemaVersion: z.number().int().nonnegative(),
  config: z.unknown(),
  responsiveLayout: z.unknown().optional(),
  sortOrder: z.number().int().nonnegative(),
});

const editorDraftSchema = z.strictObject({
  pageId: z.string().uuid(),
  expectedVersion: z.number().int().positive(),
  title: z.string().max(300),
  slug: z.string().max(120),
  visible: z.boolean(),
  publicNote: z.string().max(10_000).nullable().optional(),
  blocks: z.array(serializedBlockSchema).max(500),
});

export type EditorSaveInput = z.input<typeof editorDraftSchema>;
export type EditorSaveResult = AutosaveResponse<PageSnapshot>;

export async function saveEditorPage(input: unknown): Promise<EditorSaveResult> {
  const admin = await requireAdmin();
  const parsed = editorDraftSchema.safeParse(input);
  if (!parsed.success) {
    return {
      status: "validation-error",
      issues: parsed.error.issues.map((issue) => issue.message),
    };
  }

  if (process.env.BUZZ_DEMO_MODE === "true") {
    return { status: "saved", version: parsed.data.expectedVersion + 1 };
  }

  try {
    const result = await savePageDraft({
      ...parsed.data,
      authorId: admin.user.id,
    });
    if (result.status === "accepted") {
      return {
        status: "saved",
        version: result.value.page.version,
        snapshot: result.value,
      };
    }
    if (result.status === "not-found") {
      return {
        status: "validation-error",
        issues: ["ไม่พบหน้าที่ต้องการบันทึก"],
      };
    }
    return result;
  } catch (cause) {
    return {
      status: "transient-error",
      message: cause instanceof Error ? cause.message : "บันทึกไม่สำเร็จ",
    };
  }
}

export async function saveEditorDataSource(
  input: unknown,
): Promise<AutosaveResponse<DataSourceSnapshot>> {
  const admin = await requireAdmin();
  const parsed = dataSourceSnapshotSchema.safeParse(input);
  if (!parsed.success) {
    return {
      status: "validation-error",
      issues: parsed.error.issues.map((issue) => issue.message),
    };
  }
  if (process.env.BUZZ_DEMO_MODE === "true") {
    return {
      status: "saved",
      version: parsed.data.version + 1,
      snapshot: { ...parsed.data, version: parsed.data.version + 1 },
    };
  }
  try {
    const result = await saveDataSourceVersion({
      ...parsed.data,
      expectedVersion: parsed.data.version,
      authorId: admin.user.id,
    });
    if (result.status === "accepted") {
      return {
        status: "saved",
        version: result.value.version,
        snapshot: result.value,
      };
    }
    if (result.status === "not-found") {
      return { status: "validation-error", issues: ["ไม่พบแหล่งข้อมูล"] };
    }
    return result;
  } catch (cause) {
    return {
      status: "transient-error",
      message: cause instanceof Error ? cause.message : "บันทึกข้อมูลไม่สำเร็จ",
    };
  }
}

export async function createEditorRevision(
  pageId: string,
  label: string,
): Promise<{ status: "saved"; id: string } | { status: "error" }> {
  const admin = await requireAdmin();
  const parsed = z.string().uuid().safeParse(pageId);
  const safeLabel = z.string().trim().min(1).max(160).safeParse(label);
  if (!parsed.success || !safeLabel.success) return { status: "error" };
  if (process.env.BUZZ_DEMO_MODE === "true") {
    return { status: "saved", id: crypto.randomUUID() };
  }
  const id = await createNamedRevision(parsed.data, safeLabel.data, admin.user.id);
  return id ? { status: "saved", id } : { status: "error" };
}

const templateApplicationSchema = z.strictObject({
  templateSlug: z.string().min(1).max(120),
  characterSlug: slugSchema,
  nameTh: z.string().trim().min(1).max(160),
  nameEn: z.string().trim().max(160).optional(),
  description: z.string().trim().max(2_000).optional(),
});

export async function applyEditorTemplate(input: unknown): Promise<
  | { status: "created"; location: string }
  | { status: "validation-error"; issues: string[] }
  | { status: "error"; message: string }
> {
  const admin = await requireAdmin();
  const parsed = templateApplicationSchema.safeParse(input);
  if (!parsed.success) {
    return {
      status: "validation-error",
      issues: parsed.error.issues.map((issue) => issue.message),
    };
  }
  const template = builtInTemplates.find(
    (candidate) => candidate.slug === parsed.data.templateSlug,
  );
  if (!template) {
    return { status: "validation-error", issues: ["ไม่พบเทมเพลต"] };
  }
  if (process.env.BUZZ_DEMO_MODE === "true") {
    return { status: "created", location: "/admin/astra/info" };
  }
  try {
    const applied = await persistTemplateApplication(
      template,
      {
        slug: parsed.data.characterSlug,
        nameTh: parsed.data.nameTh,
        nameEn: parsed.data.nameEn,
        description: parsed.data.description,
      },
      admin.user.id,
    );
    return {
      status: "created",
      location: `/admin/${applied.characterSlug}/${applied.firstPageSlug}`,
    };
  } catch (cause) {
    return {
      status: "error",
      message: cause instanceof Error ? cause.message : "สร้างคู่มือไม่สำเร็จ",
    };
  }
}

type GuideActionResult =
  | { status: "saved"; version?: number; location?: string }
  | { status: "conflict"; currentVersion: number; message: string }
  | { status: "error"; message: string };

type CreateGuideActionResult = Exclude<GuideActionResult, { status: "conflict" }>;

async function runGuideAction(action: () => Promise<{ version?: number }>): Promise<GuideActionResult> {
  try {
    const result = await action();
    return { status: "saved", version: result.version };
  } catch (cause) {
    if (cause instanceof GuideVersionConflictError) {
      return { status: "conflict", currentVersion: cause.currentVersion, message: cause.message };
    }
    if (cause instanceof z.ZodError) {
      return { status: "error", message: cause.issues.map((issue) => issue.message).join(" • ") };
    }
    return { status: "error", message: cause instanceof Error ? cause.message : "บันทึกไม่สำเร็จ" };
  }
}

export async function createStructuredGuide(input: unknown): Promise<CreateGuideActionResult> {
  await requireAdmin();
  try {
    const guide = await createGuide(input);
    return { status: "saved", version: guide.version, location: `/admin/${guide.characterKey}` };
  } catch (cause) {
    return { status: "error", message: cause instanceof Error ? cause.message : "สร้าง Guide ไม่สำเร็จ" };
  }
}

export async function saveWeaponSection(guideId: string, input: unknown) {
  await requireAdmin();
  return runGuideAction(() => saveWeapons(guideId, input));
}

export async function saveGuideOverview(guideId: string, input: unknown) {
  await requireAdmin();
  return runGuideAction(() => updateGuideBasics(guideId, input));
}

export async function saveArtifactSection(guideId: string, input: unknown) {
  await requireAdmin();
  return runGuideAction(() => saveArtifacts(guideId, input));
}

export async function saveConstellationSection(guideId: string, input: unknown) {
  await requireAdmin();
  return runGuideAction(() => saveConstellations(guideId, input));
}

export async function saveTeamSection(guideId: string, input: unknown) {
  await requireAdmin();
  return runGuideAction(() => saveTeams(guideId, input));
}

export async function saveExtraSectionList(guideId: string, input: unknown) {
  await requireAdmin();
  return runGuideAction(() => saveExtraSections(guideId, input));
}

export async function moveGuideToTrash(guideId: string) {
  await requireAdmin();
  return runGuideAction(() => trashGuide(guideId));
}

export async function restoreStructuredGuide(guideId: string) {
  await requireAdmin();
  return runGuideAction(() => restoreGuide(guideId));
}

export async function setStructuredGuideVisibility(
  guideId: string,
  isPublic: boolean,
) {
  await requireAdmin();
  return runGuideAction(() => setGuideVisibility(guideId, isPublic));
}

export async function deleteStructuredGuide(guideId: string) {
  await requireAdmin();
  return runGuideAction(() => permanentlyDeleteGuide(guideId));
}

export async function startCatalogSync() {
  await requireAdmin();
  try {
    return await runCatalogSync();
  } catch (cause) {
    return { status: "error" as const, message: cause instanceof Error ? cause.message : "เริ่ม Sync ไม่สำเร็จ" };
  }
}