import type {
	CreatureId,
	Pf2eCreature,
	TraitBlock,
	TraitSegment,
} from "@initiative/domain";
import { creatureId } from "@initiative/domain";
import { stripTags } from "./strip-tags.js";

// -- Raw Pf2eTools types (minimal, for parsing) --

interface RawPf2eCreature {
	name: string;
	source: string;
	level?: number;
	traits?: string[];
	perception?: { std?: number };
	senses?: { name?: string; type?: string; range?: number }[];
	languages?: { languages?: string[] };
	skills?: Record<string, { std?: number }>;
	abilityMods?: Record<string, number>;
	items?: string[];
	defenses?: RawDefenses;
	speed?: Record<string, number | { number: number }>;
	attacks?: RawAttack[];
	abilities?: {
		top?: RawAbility[];
		mid?: RawAbility[];
		bot?: RawAbility[];
	};
	_copy?: unknown;
}

interface RawDefenses {
	ac?: Record<string, unknown>;
	savingThrows?: {
		fort?: { std?: number };
		ref?: { std?: number };
		will?: { std?: number };
	};
	hp?: { hp?: number }[];
	immunities?: (string | { name: string })[];
	resistances?: { amount?: number; name: string; note?: string }[];
	weaknesses?: { amount?: number; name: string; note?: string }[];
}

interface RawAbility {
	name?: string;
	activity?: { number?: number; unit?: string };
	traits?: string[];
	entries?: RawEntry[];
}

interface RawAttack {
	range?: string;
	name: string;
	attack?: number;
	traits?: string[];
	damage?: string;
}

type RawEntry = string | RawEntryObject;

interface RawEntryObject {
	type?: string;
	items?: (string | { name?: string; entry?: string })[];
	entries?: RawEntry[];
}

// -- Module state --

let sourceDisplayNames: Record<string, string> = {};

export function setPf2eSourceDisplayNames(names: Record<string, string>): void {
	sourceDisplayNames = names;
}

// -- Helpers --

function capitalize(s: string): string {
	return s.charAt(0).toUpperCase() + s.slice(1);
}

function formatActivityIcon(
	activity: { number?: number; unit?: string } | undefined,
): string {
	if (!activity) return "";
	switch (activity.unit) {
		case "free":
			return "\u25C7 ";
		case "reaction":
			return "\u21BA ";
		case "action":
			return "\u25C6".repeat(activity.number ?? 1) + " ";
		default:
			return "";
	}
}

function stripAngleBrackets(s: string): string {
	return s.replaceAll(/<([^>]+)>/g, "$1");
}

function makeCreatureId(source: string, name: string): CreatureId {
	const slug = name
		.toLowerCase()
		.replaceAll(/[^a-z0-9]+/g, "-")
		.replaceAll(/(^-|-$)/g, "");
	return creatureId(`${source.toLowerCase()}:${slug}`);
}

function formatSpeed(
	speed: Record<string, number | { number: number }> | undefined,
): string {
	if (!speed) return "";
	const parts: string[] = [];
	for (const [mode, value] of Object.entries(speed)) {
		if (typeof value === "number") {
			parts.push(
				mode === "walk" ? `${value} feet` : `${capitalize(mode)} ${value} feet`,
			);
		} else if (typeof value === "object" && "number" in value) {
			parts.push(
				mode === "walk"
					? `${value.number} feet`
					: `${capitalize(mode)} ${value.number} feet`,
			);
		}
	}
	return parts.join(", ");
}

function formatSkills(
	skills: Record<string, { std?: number }> | undefined,
): string | undefined {
	if (!skills) return undefined;
	const parts = Object.entries(skills)
		.map(([name, val]) => `${capitalize(name)} +${val.std ?? 0}`)
		.sort();
	return parts.length > 0 ? parts.join(", ") : undefined;
}

function formatSenses(
	senses:
		| readonly { name?: string; type?: string; range?: number }[]
		| undefined,
): string | undefined {
	if (!senses || senses.length === 0) return undefined;
	return senses
		.map((s) => {
			const label = stripTags(s.name ?? s.type ?? "");
			if (!label) return "";
			const parts = [capitalize(label)];
			if (s.type && s.name) parts.push(`(${s.type})`);
			if (s.range != null) parts.push(`${s.range} feet`);
			return parts.join(" ");
		})
		.filter(Boolean)
		.join(", ");
}

function formatLanguages(
	languages: { languages?: string[] } | undefined,
): string | undefined {
	if (!languages?.languages || languages.languages.length === 0)
		return undefined;
	return languages.languages.map(capitalize).join(", ");
}

function formatImmunities(
	immunities: readonly (string | { name: string })[] | undefined,
): string | undefined {
	if (!immunities || immunities.length === 0) return undefined;
	return immunities
		.map((i) => capitalize(typeof i === "string" ? i : i.name))
		.join(", ");
}

function formatResistances(
	resistances:
		| readonly { amount?: number; name: string; note?: string }[]
		| undefined,
): string | undefined {
	if (!resistances || resistances.length === 0) return undefined;
	return resistances
		.map((r) => {
			const base =
				r.amount == null
					? capitalize(r.name)
					: `${capitalize(r.name)} ${r.amount}`;
			return r.note ? `${base} (${r.note})` : base;
		})
		.join(", ");
}

function formatWeaknesses(
	weaknesses:
		| readonly { amount?: number; name: string; note?: string }[]
		| undefined,
): string | undefined {
	if (!weaknesses || weaknesses.length === 0) return undefined;
	return weaknesses
		.map((w) => {
			const base =
				w.amount == null
					? capitalize(w.name)
					: `${capitalize(w.name)} ${w.amount}`;
			return w.note ? `${base} (${w.note})` : base;
		})
		.join(", ");
}

// -- Entry parsing --

function segmentizeEntries(entries: unknown): TraitSegment[] {
	if (!Array.isArray(entries)) return [];
	const segments: TraitSegment[] = [];
	for (const entry of entries) {
		if (typeof entry === "string") {
			segments.push({ type: "text", value: stripTags(entry) });
		} else if (typeof entry === "object" && entry !== null) {
			const obj = entry as RawEntryObject;
			if (obj.type === "list" && Array.isArray(obj.items)) {
				segments.push({
					type: "list",
					items: obj.items.map((item) => {
						if (typeof item === "string") {
							return { text: stripTags(item) };
						}
						return { label: item.name, text: stripTags(item.entry ?? "") };
					}),
				});
			} else if (Array.isArray(obj.entries)) {
				segments.push(...segmentizeEntries(obj.entries));
			}
		}
	}
	return segments;
}

function formatAffliction(a: Record<string, unknown>): TraitSegment[] {
	const parts: string[] = [];
	if (a.note) parts.push(stripTags(String(a.note)));
	if (a.DC) parts.push(`DC ${a.DC}`);
	if (a.savingThrow) parts.push(String(a.savingThrow));
	const stages = a.stages as
		| { stage: number; entry: string; duration: string }[]
		| undefined;
	if (stages) {
		for (const s of stages) {
			parts.push(`Stage ${s.stage}: ${stripTags(s.entry)} (${s.duration})`);
		}
	}
	return parts.length > 0 ? [{ type: "text", value: parts.join("; ") }] : [];
}

function normalizeAbilities(
	abilities: readonly RawAbility[] | undefined,
): TraitBlock[] | undefined {
	if (!abilities || abilities.length === 0) return undefined;
	return abilities
		.filter((a) => a.name)
		.map((a) => {
			const raw = a as Record<string, unknown>;
			const icon = formatActivityIcon(a.activity);
			const traits =
				a.traits && a.traits.length > 0
					? `(${a.traits.map((t) => capitalize(stripAngleBrackets(stripTags(t)))).join(", ")}) `
					: "";
			const body = Array.isArray(a.entries)
				? segmentizeEntries(a.entries)
				: formatAffliction(raw);
			const name = icon + stripTags(a.name as string);
			if (traits && body.length > 0 && body[0].type === "text") {
				return {
					name,
					segments: [
						{ type: "text" as const, value: traits + body[0].value },
						...body.slice(1),
					],
				};
			}
			return {
				name,
				segments: traits
					? [{ type: "text" as const, value: traits }, ...body]
					: body,
			};
		});
}

function normalizeAttacks(
	attacks: readonly RawAttack[] | undefined,
): TraitBlock[] | undefined {
	if (!attacks || attacks.length === 0) return undefined;
	return attacks.map((a) => {
		const parts: string[] = [];
		if (a.range) parts.push(a.range);
		const attackMod = a.attack == null ? "" : ` +${a.attack}`;
		const traits =
			a.traits && a.traits.length > 0
				? ` (${a.traits.map((t) => stripAngleBrackets(stripTags(t))).join(", ")})`
				: "";
		const damage = a.damage
			? `, ${stripAngleBrackets(stripTags(a.damage))}`
			: "";
		return {
			name: capitalize(stripTags(a.name)),
			segments: [
				{
					type: "text" as const,
					value: `${parts.join(" ")}${attackMod}${traits}${damage}`,
				},
			],
		};
	});
}

// -- Defenses extraction --

function extractDefenses(defenses: RawDefenses | undefined) {
	const acRecord = defenses?.ac ?? {};
	const acStd = (acRecord.std as number | undefined) ?? 0;
	const acEntries = Object.entries(acRecord).filter(([k]) => k !== "std");
	return {
		ac: acStd,
		acConditional:
			acEntries.length > 0
				? acEntries.map(([k, v]) => `${v} ${k}`).join(", ")
				: undefined,
		saveFort: defenses?.savingThrows?.fort?.std ?? 0,
		saveRef: defenses?.savingThrows?.ref?.std ?? 0,
		saveWill: defenses?.savingThrows?.will?.std ?? 0,
		hp: defenses?.hp?.[0]?.hp ?? 0,
		immunities: formatImmunities(defenses?.immunities),
		resistances: formatResistances(defenses?.resistances),
		weaknesses: formatWeaknesses(defenses?.weaknesses),
	};
}

// -- Main normalization --

function normalizeCreature(raw: RawPf2eCreature): Pf2eCreature {
	const source = raw.source ?? "";
	const defenses = extractDefenses(raw.defenses);
	const mods = raw.abilityMods ?? {};

	return {
		system: "pf2e",
		id: makeCreatureId(source, raw.name),
		name: raw.name,
		source,
		sourceDisplayName: sourceDisplayNames[source] ?? source,
		level: raw.level ?? 0,
		traits: raw.traits ?? [],
		perception: raw.perception?.std ?? 0,
		senses: formatSenses(raw.senses),
		languages: formatLanguages(raw.languages),
		skills: formatSkills(raw.skills),
		abilityMods: {
			str: mods.str ?? 0,
			dex: mods.dex ?? 0,
			con: mods.con ?? 0,
			int: mods.int ?? 0,
			wis: mods.wis ?? 0,
			cha: mods.cha ?? 0,
		},
		...defenses,
		speed: formatSpeed(raw.speed),
		attacks: normalizeAttacks(raw.attacks),
		abilitiesTop: normalizeAbilities(raw.abilities?.top),
		abilitiesMid: normalizeAbilities(raw.abilities?.mid),
		abilitiesBot: normalizeAbilities(raw.abilities?.bot),
	};
}

export function normalizePf2eBestiary(raw: {
	creature: unknown[];
}): Pf2eCreature[] {
	return (raw.creature ?? [])
		.filter((c: unknown) => {
			const obj = c as { _copy?: unknown };
			return !obj._copy;
		})
		.map((c) => normalizeCreature(c as RawPf2eCreature));
}