---
import { and, asc, desc, eq, gt, lt, max } from "drizzle-orm";
import AdminLayout from "../../layouts/AdminLayout.astro";
import ImageField from "../../components/admin/ImageField.astro";
import { cases } from "../../db/schema";
import { getDb } from "../../lib/db";
import { getEnv } from "../../lib/env";
import { parseForm } from "../../lib/form";
import { deleteMedia } from "../../lib/media";
import { caseInput } from "../../schemas";

export const prerender = false;

const env = getEnv();
const db = getDb(env.DB);

let errors: Record<string, string> = {};
let failedId = "";
let failedAdd = false;

function str(form: FormData, key: string): string {
  return String(form.get(key) ?? "").trim();
}

if (Astro.request.method === "POST") {
  const form = await Astro.request.formData();
  const action = str(form, "action");

  if (action === "add" || action === "save") {
    const parsed = parseForm(form, caseInput);
    if (!parsed.ok) {
      errors = parsed.errors;
      failedId = str(form, "id");
      failedAdd = action === "add";
    } else if (action === "add") {
      const [row] = await db.select({ m: max(cases.sortOrder) }).from(cases);
      await db.insert(cases).values({
        id: crypto.randomUUID(),
        title: parsed.data.title,
        location: parsed.data.location || null,
        completedAt: parsed.data.completedAt || null,
        description: parsed.data.description || null,
        imageUrl: parsed.data.imageUrl || null,
        sortOrder: (row?.m ?? 0) + 1,
        status: parsed.data.status,
        updatedAt: new Date(),
      });
    } else {
      const id = str(form, "id");
      const newImage = parsed.data.imageUrl || null;
      const [current] = await db.select().from(cases).where(eq(cases.id, id)).limit(1);
      if (current && current.imageUrl !== newImage) {
        await deleteMedia(env, current.imageUrl);
      }
      await db
        .update(cases)
        .set({
          title: parsed.data.title,
          location: parsed.data.location || null,
          completedAt: parsed.data.completedAt || null,
          description: parsed.data.description || null,
          imageUrl: newImage,
          status: parsed.data.status,
          updatedAt: new Date(),
        })
        .where(eq(cases.id, id));
    }
  } else if (action === "delete") {
    const id = str(form, "id");
    const [current] = await db.select().from(cases).where(eq(cases.id, id)).limit(1);
    await deleteMedia(env, current?.imageUrl);
    await db.delete(cases).where(eq(cases.id, id));
  } else if (action === "up" || action === "down") {
    const id = str(form, "id");
    const [current] = await db.select().from(cases).where(eq(cases.id, id)).limit(1);
    if (current) {
      const [adj] = await db
        .select()
        .from(cases)
        .where(
          action === "up" ? lt(cases.sortOrder, current.sortOrder) : gt(cases.sortOrder, current.sortOrder),
        )
        .orderBy(action === "up" ? desc(cases.sortOrder) : asc(cases.sortOrder))
        .limit(1);
      if (adj) {
        await db.update(cases).set({ sortOrder: adj.sortOrder }).where(eq(cases.id, current.id));
        await db.update(cases).set({ sortOrder: current.sortOrder }).where(eq(cases.id, adj.id));
      }
    }
  }

  if (Object.keys(errors).length === 0) {
    return Astro.redirect("/admin/cases");
  }
}

const list = await db.select().from(cases).orderBy(asc(cases.sortOrder));
---

<AdminLayout title="完成案例">
  <h1>完成案例</h1>
  <p class="sub">前台「完成案例」區塊會按下面次序顯示（只顯示已發布）。</p>

  <div class="card">
    <h2>新增案例</h2>
    <form method="post">
      <input type="hidden" name="action" value="add" />
      <div class="grid2">
        <div>
          <label for="a-title">標題</label>
          {failedAdd && errors.title && <span class="field-error">{errors.title}</span>}
          <input id="a-title" name="title" type="text" required placeholder="例：大埔上碗窯 — 雙玻光伏板" />
        </div>
        <div>
          <label for="a-loc">地點</label>
          <input id="a-loc" name="location" type="text" placeholder="例：大埔半山" />
        </div>
        <div>
          <label for="a-date">施工日期</label>
          <input id="a-date" name="completedAt" type="text" placeholder="例：2026年2月" />
        </div>
        <div>
          <ImageField name="imageUrl" label="圖片" scope="cases" id="a-img" />
        </div>
        <div style="grid-column:1/-1">
          <label for="a-desc">描述</label>
          <textarea id="a-desc" name="description"></textarea>
        </div>
      </div>
      <div class="actions"><button type="submit">+ 新增案例</button></div>
    </form>
  </div>

  {
    list.length === 0 ? (
      <p class="muted">暫時未有案例。</p>
    ) : (
      list.map((item, i) => (
        <div class="card">
          <form method="post">
            <input type="hidden" name="id" value={item.id} />
            <div class="grid2">
              <div>
                <label>標題</label>
                {failedId === item.id && errors.title && <span class="field-error">{errors.title}</span>}
                <input name="title" type="text" value={item.title} required />
              </div>
              <div>
                <label>地點</label>
                <input name="location" type="text" value={item.location ?? ""} />
              </div>
              <div>
                <label>施工日期</label>
                <input name="completedAt" type="text" value={item.completedAt ?? ""} />
              </div>
              <div>
                <ImageField
                  name="imageUrl"
                  label="圖片"
                  scope="cases"
                  value={item.imageUrl}
                  id={`img-${item.id}`}
                />
              </div>
              <div style="grid-column:1/-1">
                <label>描述</label>
                <textarea name="description">{item.description ?? ""}</textarea>
              </div>
              <div>
                <label>狀態</label>
                <select name="status">
                  <option value="published" selected={item.status === "published"}>已發布</option>
                  <option value="draft" selected={item.status === "draft"}>草稿</option>
                </select>
              </div>
            </div>
            <div class="actions">
              <button type="submit" name="action" value="save">儲存</button>
              <button type="submit" name="action" value="up" class="secondary mini" disabled={i === 0}>↑ 上移</button>
              <button type="submit" name="action" value="down" class="secondary mini" disabled={i === list.length - 1}>
                ↓ 下移
              </button>
              <button
                type="submit"
                name="action"
                value="delete"
                class="danger mini"
                onclick="return confirm('確定刪除？')"
              >
                刪除
              </button>
            </div>
          </form>
        </div>
      ))
    )
  }
</AdminLayout>