"use client";

import { PlusIcon, RotateCcwIcon } from "lucide-react";
import { useMemo } from "react";
import * as z from "zod";

import {
  ImageCatalogPicker,
  type ImageCatalogCharacter,
} from "@/components/admin/image-generator-fields";
import { useImageGeneratorDraft } from "@/components/admin/use-image-generator-draft";
import {
  ConstellationImage,
  type ConstellationImageGroup,
  type ConstellationImageGuide,
} from "@/components/public/constellation-image";
import { GuideImageExport } from "@/components/public/guide-image-export";
import { Button } from "@/components/ui/button";
import {
  Card,
  CardAction,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import {
  Empty,
  EmptyContent,
  EmptyDescription,
  EmptyHeader,
  EmptyMedia,
  EmptyTitle,
} from "@/components/ui/empty";
import { Field, FieldGroup, FieldLabel } from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { Switch } from "@/components/ui/switch";
import { Textarea } from "@/components/ui/textarea";

const rowSchema = z.object({
  level: z.number().int().min(1).max(6),
  cumulativePercent: z.string(),
  isGreat: z.boolean(),
});

const draftSchema = z.object({
  characterKey: z.string(),
  note: z.string(),
  rows: z.array(rowSchema).max(6).refine((rows) => rows.length === 0 || rows.length === 6),
});

type ConstellationDraft = z.infer<typeof draftSchema>;

const INITIAL_CONSTELLATION_DRAFT: ConstellationDraft = {
  characterKey: "",
  note: "",
  rows: [],
};

const constellationRows = (): ConstellationDraft["rows"] =>
  Array.from({ length: 6 }, (_, index) => ({
    level: index + 1,
    cumulativePercent: "100",
    isGreat: false,
  }));

const parseConstellationDraft = (value: unknown): ConstellationDraft | null => {
  const parsed = draftSchema.safeParse(value);
  return parsed.success ? parsed.data : null;
};

function validPercent(value: string): boolean {
  const number = Number(value);
  return value.trim().length > 0 && Number.isFinite(number) && number >= -9999 && number <= 9999;
}

export function ConstellationImageGenerator({
  characters,
}: {
  characters: ImageCatalogCharacter[];
}) {
  const [draft, setDraft, resetDraft] = useImageGeneratorDraft(
    "buzz-sheet:admin-image:constellation",
    INITIAL_CONSTELLATION_DRAFT,
    parseConstellationDraft,
  );
  const character = characters.find((item) => item.key === draft.characterKey);
  const valid = Boolean(character && draft.rows.every((row) => validPercent(row.cumulativePercent)));

  const guide = useMemo<ConstellationImageGuide>(() => ({
    coverUrl: character?.imageUrl ?? "",
    character: {
      name: character?.name ?? "Character",
      splashImageUrl: character?.splashImageUrl ?? character?.imageUrl ?? null,
    },
  }), [character]);

  const group = useMemo<ConstellationImageGroup>(() => ({
    note: draft.note.trim() || null,
    rows: draft.rows,
  }), [draft.note, draft.rows]);

  return (
    <div className="grid items-start gap-6 xl:grid-cols-[minmax(24rem,1fr)_minmax(28rem,1fr)]">
      <Card>
        <CardHeader>
          <CardTitle>ข้อมูล Constellation</CardTitle>
          <CardDescription>กรอกดาเมจสะสม C1–C6 เทียบกับ C0 ที่ 100%</CardDescription>
          <CardAction>
            <Button type="button" variant="ghost" size="sm" onClick={resetDraft}>
              <RotateCcwIcon data-icon="inline-start" />
              Reset
            </Button>
          </CardAction>
        </CardHeader>
        <CardContent className="flex flex-col gap-5">
          {!draft.rows.length ? (
            <Empty className="border">
              <EmptyHeader>
                <EmptyMedia variant="icon"><PlusIcon /></EmptyMedia>
                <EmptyTitle>ยังไม่มี Constellation</EmptyTitle>
                <EmptyDescription>สร้างรายการ C1–C6 เพื่อเริ่มกรอกเปอร์เซ็นต์ดาเมจ</EmptyDescription>
              </EmptyHeader>
              <EmptyContent>
                <Button type="button" onClick={() => setDraft((current) => ({ ...current, rows: constellationRows() }))}>
                  <PlusIcon data-icon="inline-start" />
                  สร้าง Constellation
                </Button>
              </EmptyContent>
            </Empty>
          ) : (
            <>
          <FieldGroup>
            <Field data-invalid={!character}>
              <FieldLabel>ตัวละคร</FieldLabel>
              <ImageCatalogPicker
                items={characters}
                value={draft.characterKey}
                invalid={!character}
                placeholder="ค้นหาตัวละคร…"
                onChange={(characterKey) => setDraft((current) => ({ ...current, characterKey }))}
              />
            </Field>
            <Field>
              <FieldLabel htmlFor="constellation-image-note">โน้ตท้ายภาพ (ถ้ามี)</FieldLabel>
              <Textarea
                id="constellation-image-note"
                value={draft.note}
                onChange={(event) => setDraft((current) => ({ ...current, note: event.target.value }))}
              />
            </Field>
          </FieldGroup>

          <FieldGroup>
            {draft.rows.map((row, index) => (
              <Field key={row.level} data-invalid={!validPercent(row.cumulativePercent)}>
                <div className="grid grid-cols-[3rem_minmax(0,1fr)_auto] items-center gap-3">
                  <FieldLabel htmlFor={`constellation-image-c${row.level}`}>
                    C{row.level}
                  </FieldLabel>
                  <Input
                    id={`constellation-image-c${row.level}`}
                    type="number"
                    step="0.01"
                    value={row.cumulativePercent}
                    aria-invalid={!validPercent(row.cumulativePercent)}
                    onChange={(event) => setDraft((current) => ({
                      ...current,
                      rows: current.rows.map((item, rowIndex) => rowIndex === index
                        ? { ...item, cumulativePercent: event.target.value }
                        : item),
                    }))}
                  />
                  <Field orientation="horizontal">
                    <Switch
                      id={`constellation-image-great-${row.level}`}
                      checked={row.isGreat}
                      onCheckedChange={(isGreat) => setDraft((current) => ({
                        ...current,
                        rows: current.rows.map((item, rowIndex) => rowIndex === index
                          ? { ...item, isGreat }
                          : item),
                      }))}
                    />
                    <FieldLabel htmlFor={`constellation-image-great-${row.level}`}>เด่น</FieldLabel>
                  </Field>
                </div>
              </Field>
            ))}
          </FieldGroup>
            </>
          )}
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle>ภาพส่งออก</CardTitle>
          <CardDescription>ใช้กราฟเดียวกับ Constellation export ใน Guide</CardDescription>
        </CardHeader>
        <CardContent>
          {!draft.rows.length ? (
            <Empty className="border">
              <EmptyHeader>
                <EmptyTitle>ยังไม่มี Preview</EmptyTitle>
                <EmptyDescription>สร้าง Constellation แล้วกรอกข้อมูลเพื่อดูภาพส่งออก</EmptyDescription>
              </EmptyHeader>
            </Empty>
          ) : (
            <GuideImageExport
            fileName={`${character?.name ?? "character"}-Constellations.png`}
            width={1500}
            height={1500}
            captureClassName="p-0"
            modeSelection="inline"
            disabled={!valid}
          >
            <ConstellationImage guide={guide} group={group} />
            </GuideImageExport>
          )}
        </CardContent>
      </Card>
    </div>
  );
}