import Image from "next/image";
import Link from "next/link";
import { ChevronLeftIcon, DownloadIcon } from "lucide-react";

import { Badge } from "@/components/ui/badge";
import { buttonVariants } from "@/components/ui/button";
import { Card, CardAction, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Kbd } from "@/components/ui/kbd";
import { Separator } from "@/components/ui/separator";
import { SiteHeader } from "@/components/public/site-header";
import { LiveRefresh } from "@/components/live-refresh";
import { rarityGradientClass, rarityTextClass } from "@/lib/catalog/rarity";
import type { PublicGuide } from "@/lib/guides/queries";
import { cn } from "@/lib/utils";

function hasSection(guide: PublicGuide, slug: string): boolean {
  if (slug === "weapon") return guide.weapons.length > 0;
  if (slug === "artifact") return guide.artifactGroups.some((group) => group.rows.length > 0) || Boolean(guide.artifactProfile && (guide.artifactProfile.sands.length || guide.artifactProfile.goblet.length || guide.artifactProfile.circlet.length));
  if (slug === "constellations") return guide.constellations.length > 0;
  if (slug === "team") return guide.teams.length > 0;
  return guide.extras.some((extra) => extra.slug === slug && extra.rows.length > 0);
}

export function publicSections(guide: PublicGuide) {
  return guide.sections.filter((section) => hasSection(guide, section.slug));
}

export function StructuredGuideShell({ guide, section }: { guide: PublicGuide; section?: string }) {
  const sections = publicSections(guide);
  return <div className="min-h-svh bg-background"><LiveRefresh endpoint={`/api/events/page/${guide.id}`} /><SiteHeader /><div className="sticky top-0 border-b bg-background/95 supports-backdrop-filter:backdrop-blur"><div className="mx-auto flex min-h-16 w-full max-w-7xl items-center gap-3 px-4 sm:px-6"><Link href="/" aria-label="กลับหน้ารวม" className="grid size-10 place-items-center rounded-lg hover:bg-muted"><ChevronLeftIcon /></Link><div className="relative size-11 overflow-hidden rounded-lg border"><Image src={guide.character.imageUrl} alt={guide.name} fill className="object-cover" /></div><div className="min-w-0 flex-1"><p className="truncate font-heading font-semibold">{guide.name}</p><p className="truncate text-xs text-muted-foreground">Build Guide</p></div>{guide.character.element ? <Badge>{guide.character.elementIconUrl ? <Image src={guide.character.elementIconUrl} alt="" width={16} height={16} className="brightness-0 invert" /> : null}{guide.character.element}</Badge> : null}</div><nav className="mx-auto flex min-h-11 w-full max-w-7xl gap-1 overflow-x-auto px-4 sm:px-6"><Link href={`/${guide.slug}`} className={cn("flex items-center rounded-md px-3 text-sm text-muted-foreground", !section && "bg-muted text-foreground")}>Overview</Link>{sections.map((item) => <Link key={item.id} href={`/${guide.slug}/${item.slug}`} className={cn("flex items-center rounded-md px-3 text-sm text-muted-foreground", section === item.slug && "bg-muted text-foreground")}>{item.title}</Link>)}</nav></div><main className="mx-auto w-full max-w-7xl p-4 sm:p-6 lg:p-10">{section ? <GuideSection guide={guide} section={section} /> : <GuideOverview guide={guide} sections={sections} />}</main></div>;
}

function GuideOverview({ guide, sections }: { guide: PublicGuide; sections: ReturnType<typeof publicSections> }) {
  return <div className="flex flex-col gap-8"><div className="relative mx-auto aspect-square w-full max-w-3xl overflow-hidden rounded-xl border bg-muted"><Image src={guide.coverUrl} alt={`Guide ${guide.name}`} fill priority className="object-cover" /></div><div className="mx-auto flex max-w-3xl flex-col gap-3 text-center"><p className="text-sm font-medium text-primary">Build Overview</p><h1 className="font-heading text-4xl font-semibold">{guide.name}</h1><p className="text-lg leading-8 text-muted-foreground">{guide.overview}</p></div>{sections.length ? <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">{sections.map((item) => <Link key={item.id} href={`/${guide.slug}/${item.slug}`}><Card className="h-full"><CardHeader><CardTitle>{item.title}</CardTitle><CardDescription>เปิดดูคำแนะนำฉบับเต็ม</CardDescription></CardHeader></Card></Link>)}</div> : <Card><CardHeader><CardTitle>กำลังจัดทำเนื้อหา</CardTitle><CardDescription>กลับมาตรวจสอบอีกครั้งหลังผู้ดูแลเพิ่มข้อมูล</CardDescription></CardHeader></Card>}</div>;
}

function GuideSection({ guide, section }: { guide: PublicGuide; section: string }) {
  if (section === "weapon") return <WeaponSection guide={guide} />;
  if (section === "artifact") return <ArtifactSection guide={guide} />;
  if (section === "constellations") return <ConstellationSection guide={guide} />;
  if (section === "team") return <TeamSection guide={guide} />;
  const extra = guide.extras.find((item) => item.slug === section);
  return extra ? <ExtraSection extra={extra} /> : null;
}

function metric(value: string | null) { return value === null ? null : `${Number(value).toLocaleString(undefined, { maximumFractionDigits: 2 })}%`; }

function WeaponSection({ guide }: { guide: PublicGuide }) {
  return (
    <section className="flex flex-col gap-6">
      <header className="text-center"><p className="text-sm font-medium text-primary">อาวุธที่แนะนำ</p><h1 className="font-heading text-4xl font-semibold">Weapons</h1></header>
      <div className="grid gap-3">
        {guide.weapons.map((row, index) => (
          <Card key={row.id} size="sm" className="bg-white py-0">
            <CardContent className="grid p-0 md:grid-cols-[minmax(0,3fr)_minmax(0,1fr)]">
              <div className={cn("flex min-h-28 min-w-0 items-center gap-4 rounded-br-[4rem] p-4 pr-10 text-white md:rounded-br-[8rem] md:pr-16", rarityGradientClass(row.weapon.rarity))}>
                <div className="relative size-20 shrink-0"><Image src={row.weapon.imageUrl} alt={row.weapon.name} fill className="object-contain" /></div>
                <p className="truncate text-base font-semibold sm:text-lg">{index + 1}. {row.weapon.name} R{row.refinement}</p>
              </div>
              <div className="flex items-center justify-around gap-4 bg-white px-4 py-5 text-black">
                {row.overallPercent ? <div className="flex-1 text-center"><p className={cn("whitespace-nowrap text-4xl leading-none font-bold sm:text-5xl", rarityTextClass(row.weapon.rarity))}>{metric(row.overallPercent)}</p><p className="mt-1 text-sm sm:text-base">ดาเมททั้งทีม</p></div> : null}
                {row.personalPercent ? <div className="flex-1 text-center"><p className={cn("whitespace-nowrap text-4xl leading-none font-bold sm:text-5xl", rarityTextClass(row.weapon.rarity))}>{metric(row.personalPercent)}</p><p className="mt-1 text-sm sm:text-base">ดาเมจส่วนตัว</p></div> : null}
              </div>
            </CardContent>
          </Card>
        ))}
      </div>
    </section>
  );
}

function ArtifactSection({ guide }: { guide: PublicGuide }) { const profile = guide.artifactProfile; return <section className="flex flex-col gap-6"><header className="text-center"><p className="text-sm font-medium text-primary">อาร์ติแฟกต์และสเตตัสที่แนะนำ</p><h1 className="font-heading text-4xl font-semibold">Artifacts & Stats</h1></header><div className="grid gap-5 lg:grid-cols-[1.2fr_1fr]"> <div className="flex flex-col gap-5">{guide.artifactGroups.map((group) => <Card key={group.id}><CardHeader><CardTitle>{group.name}</CardTitle></CardHeader><CardContent className="flex flex-col gap-3">{group.rows.map((row, index) => <div key={row.id} className="flex items-center gap-3"><div className="flex -space-x-3"><div className={cn("relative size-14 overflow-hidden rounded-lg border", rarityGradientClass(row.first.rarity))}><Image src={row.first.imageUrl} alt={row.first.name} fill className="object-contain" /></div>{row.second ? <div className={cn("relative size-14 overflow-hidden rounded-lg border", rarityGradientClass(row.second.rarity))}><Image src={row.second.imageUrl} alt={row.second.name} fill className="object-contain" /></div> : null}</div><div className="min-w-0 flex-1"><p className="font-medium">{index + 1}. {row.first.name}{row.second ? ` + ${row.second.name}` : ""}</p></div><p className="text-2xl font-semibold">{metric(row.percent)}</p></div>)}</CardContent></Card>)}</div>{profile ? <Card><CardHeader><CardTitle>Recommended Stats</CardTitle></CardHeader><CardContent className="flex flex-col gap-5"><StatLine label="Sands" values={profile.sands} /><StatLine label="Goblet" values={profile.goblet} /><StatLine label="Circlet" values={profile.circlet} /><Separator /><StatLine label="Substats" values={profile.substats} />{profile.targets.length ? <div><p className="mb-2 text-sm font-medium">Target Stats</p>{profile.targets.map((target) => <div key={`${target.stat}-${target.value}`} className="flex justify-between py-1 text-sm"><span>{target.stat}</span><strong>{target.value}</strong></div>)}</div> : null}{profile.talents.length ? <div><p className="mb-2 text-sm font-medium">Talent Priority</p><div className="flex gap-2">{[...profile.talents].sort((a,b) => a.priority-b.priority).map((talent) => <Badge key={talent.type} variant="secondary">{talent.priority}. {talent.type}{talent.level ? ` ${talent.level}` : ""}</Badge>)}</div></div> : null}{profile.note ? <p className="text-sm leading-6 text-muted-foreground">{profile.note}</p> : null}</CardContent></Card> : null}</div></section>; }

function StatLine({ label, values }: { label: string; values: string[] }) { return <div><p className="text-sm text-muted-foreground">{label}</p><div className="mt-1 flex flex-wrap gap-2">{values.map((value) => <Badge key={value} variant="outline">{value}</Badge>)}</div></div>; }

function ConstellationSection({ guide }: { guide: PublicGuide }) { return <section className="flex flex-col gap-6"><header className="text-center"><p className="text-sm font-medium text-primary">กลุ่มดาว</p><h1 className="font-heading text-4xl font-semibold">Constellations</h1></header><div className="grid gap-4 md:grid-cols-2">{guide.constellations.map((row) => <Card key={row.level}><CardHeader><CardTitle className="text-3xl text-white">{metric(row.cumulativePercent)}</CardTitle><CardDescription className="text-base font-medium text-white">C{row.level} · {row.name}</CardDescription>{row.iconUrl ? <CardAction><Image src={row.iconUrl} alt="" width={48} height={48} className="rounded-lg bg-muted" /></CardAction> : null}</CardHeader><CardContent><p className="leading-7">{row.detail}</p></CardContent></Card>)}</div></section>; }

function TeamSection({ guide }: { guide: PublicGuide }) { return <section className="flex flex-col gap-6"><header className="text-center"><p className="text-sm font-medium text-primary">คำนวณความเสียหาย</p><h1 className="font-heading text-4xl font-semibold">Team Calc</h1></header><div className="grid gap-5 xl:grid-cols-2">{guide.teams.map((team) => { const total = team.members.reduce((sum, member) => sum + Number(member.damage), 0); const seconds = Number(team.rotationSeconds); return <Card key={team.id}><CardHeader><CardTitle>{team.title}</CardTitle><CardDescription>{seconds}s rotation</CardDescription><CardAction><a href={`/api/teams/${team.id}/image`} download className={buttonVariants({ variant: "outline", size: "sm" })}><DownloadIcon data-icon="inline-start" />Export image</a></CardAction></CardHeader><CardContent className="flex flex-col gap-4"><div className="grid grid-cols-2 gap-3 sm:grid-cols-4">{team.members.map((member) => <div key={member.position} className="min-w-0 text-center"><div className="grid grid-cols-[minmax(0,1fr)_2.75rem] gap-2"><div className="relative aspect-square overflow-hidden rounded-lg bg-muted"><Image src={member.character.imageUrl} alt={member.character.name} fill className="object-cover" /></div><div className="flex flex-col gap-2">{member.weapon ? <div className={cn("relative aspect-square overflow-hidden rounded-md bg-muted", rarityGradientClass(member.weapon.rarity))}><Image src={member.weapon.imageUrl} alt={member.weapon.name} fill className="object-contain" /><Kbd className="absolute top-0 right-0">R{member.refinement}</Kbd></div> : <div className="aspect-square rounded-md border bg-muted" />}{member.artifact ? <div className={cn("relative aspect-square overflow-hidden rounded-md bg-muted", rarityGradientClass(member.artifact.rarity))}><Image src={member.artifact.imageUrl} alt={member.artifact.name} fill className="object-contain" /></div> : <div className="aspect-square rounded-md border bg-muted" />}</div></div><p className="mt-2 truncate text-sm font-medium">C{member.constellation} {member.character.name}</p><p className="text-sm font-semibold">{Number(member.damage).toLocaleString(undefined, { maximumFractionDigits: 2 })}</p><p className="text-xs text-muted-foreground">{total ? (Number(member.damage) / total * 100).toFixed(2) : "0.00"}%</p></div>)}</div><Separator /><div className="flex items-end justify-between"><div><p className="text-sm text-muted-foreground">Total damage</p><p className="font-semibold">{total.toLocaleString()}</p></div><div className="text-right"><p className="text-sm text-muted-foreground">Total DPS</p><p className="text-3xl font-semibold text-primary">{seconds > 0 ? (total / seconds).toLocaleString(undefined, { maximumFractionDigits: 0 }) : "0"}</p></div></div><p className="rounded-lg bg-muted p-3 text-sm leading-6">{team.combo}</p></CardContent></Card>; })}</div></section>; }

function ExtraSection({ extra }: { extra: PublicGuide["extras"][number] }) { return <section className="flex flex-col gap-6"><header className="text-center"><p className="text-sm font-medium text-primary">Extra Guide</p><h1 className="font-heading text-4xl font-semibold">{extra.title}</h1></header><div className="grid gap-5 md:grid-cols-2">{extra.rows.map((row) => <Card key={row.id} className="overflow-hidden py-0">{row.imageUrl ? <div className="relative aspect-video bg-muted"><Image src={row.imageUrl} alt={row.heading} fill className="object-cover" /></div> : null}<CardHeader className="pt-5"><CardTitle>{row.heading}</CardTitle><CardDescription>{row.body}</CardDescription>{row.percent ? <Badge>{metric(row.percent)}</Badge> : null}</CardHeader></Card>)}</div></section>; }