// 聚珍（Juzhen）公開入口（架構 §3.1）。
//
//   const jz = createJuzhen(options);
//   jz.render(root?);   // 套用已啟用之 pass
//   jz.revert(root?);   // 還原
//
// 全域（IIFE）：window.Juzhen.createJuzhen(...)；並掛 v1 相容別名
// globalThis.createCjkAutospace（見 build.mjs footer 與 compat/v1.ts）。

import { Finder } from "./core/finder.js";
import { runPasses, revertPasses } from "./core/pass.js";
import { jiyaAdjacencyPass, jiyaPass } from "./typeset/jiya.js";
import { jinzePass } from "./typeset/jinze.js";
import { gapTrimPass, lineEdgePass } from "./typeset/lineedge.js";
import { longWordPass } from "./typeset/longword.js";
import { orphanPass } from "./typeset/orphan.js";
import { spacingPass } from "./typeset/spacing.js";
import { resolveRuleset } from "./core/unicode.js";
import type { BiasTable, JiyaOptions, JuzhenOptions, LongWordOptions, OrphanOptions, Pass, RenderContext, ResolvedOptions } from "./types.js";

export type { JuzhenOptions, ResolvedOptions, Pass };
export type { CharClassOverride, BdSubclass, Ruleset, Bias, BiasTable } from "./types.js";
export { createCjkAutospace } from "./compat/v1.js";

const DEFAULT_STYLE_INLINES = [
    "STRONG", "EM", "A", "B", "I", "U", "S", "MARK", "INS", "DEL",
    "SUB", "SUP", "SMALL", "ABBR", "CITE", "DFN", "Q", "SPAN",
    "VAR", "SAMP", "TIME", "BDO", "BDI", "RUBY", "RB", "RT", "RP", "WBR",
];
const DEFAULT_BLOCK_TAGS = [
    "BODY", "P", "DIV", "H1", "H2", "H3", "H4", "H5", "H6", "LI",
    "DT", "DD", "BLOCKQUOTE", "FIGURE", "FIGCAPTION", "TD", "TH",
    "CAPTION", "SUMMARY", "DETAILS", "HEADER", "FOOTER", "SECTION",
    "ARTICLE", "ASIDE", "NAV", "MAIN", "ADDRESS", "PRE", "UL", "OL",
    "DL", "TABLE", "TR", "THEAD", "TBODY", "TFOOT", "FORM",
    "FIELDSET", "LEGEND", "LABEL", "BR", "HR",
];
const DEFAULT_SKIP_TAGS = [
    "CODE", "KBD", "PRE", "SAMP", "TT", "VAR",
    "SCRIPT", "STYLE", "TEXTAREA", "INPUT",
];

const PASSES: Pass[] = [
    jiyaPass, jiyaAdjacencyPass, longWordPass, spacingPass, jinzePass,
    orphanPass, lineEdgePass, gapTrimPass,
];

function feature(v: unknown, dflt: boolean): boolean
{
    return v === undefined ? dflt : !!v;
}

function resolveLongWord(v: boolean | LongWordOptions | undefined): { minLength: number; lang: string }
{
    if (v === false) { return { minLength: 6, lang: "en" }; } // 值不用（enabled 為 false）
    if (v === undefined || v === true || v === null) { return { minLength: 6, lang: "en" }; }
    const minLength = typeof v.minLength === "number" && v.minLength >= 2 ? v.minLength : 6;
    const lang = typeof v.lang === "string" && v.lang ? v.lang : "en";
    return { minLength, lang };
}

function resolveOrphan(v: boolean | OrphanOptions | undefined): { chars: number }
{
    if (v && typeof v === "object")
    {
        const chars = typeof v.chars === "number" && v.chars >= 1 ? Math.floor(v.chars) : 2;
        return { chars };
    }
    return { chars: 2 };
}

function resolveJiya(
    v: boolean | JiyaOptions | undefined,
): { halfWidth: "halt" | "margin"; bias: BiasTable }
{
    if (v && typeof v === "object")
    {
        return {
            halfWidth: v.halfWidth === "margin" ? "margin" : "halt",
            bias: v.bias || {},
        };
    }
    return { halfWidth: "halt", bias: {} };
}

/** 正規化公開選項為內部 ResolvedOptions。 */
export function normalizeOptions(opts: JuzhenOptions = {}): ResolvedOptions
{
    const langOpt = opts.lang || {};
    const scope = opts.scope || {};
    return {
        locale: {
            default: langOpt.default || "zh-Hant",
            ...(langOpt.style ? { style: langOpt.style } : {}),
            policy: langOpt.policy || {},
        },
        ruleset: resolveRuleset(opts.charClass),
        autospaceClass: opts.autospaceClass || "",
        justifyAtoms: opts.justifyAtoms === false ? false : true,
        levelText: (opts.level && opts.level.text) || null,
        scope: {
            root: scope.root || null,
            include: scope.include || null,
            avoid: scope.avoid || null,
        },
        features: {
            spacing: feature(opts.spacing, true),
            longWord: opts.longWord === false ? false : feature(opts.longWord, true),
            jiya: feature(opts.jiya, true),
            jinze: feature(opts.jinze, true),
            orphan: opts.orphan === false ? false : feature(opts.orphan, true),
            hanging: feature(opts.hanging, false),
            biaodian: feature(opts.biaodian, false),
            emphasis: feature(opts.emphasis, false),
            ruby: feature(opts.ruby, false),
        },
        longWord: resolveLongWord(opts.longWord),
        orphan: resolveOrphan(opts.orphan),
        // 行端模式恒為 squeeze（行端半形）。**標點懸掛 hang 已全面停用**（§6.5.2／§6.5.6）：
        // 經 headless ＋ 真實瀏覽器實測，純負 margin 機制不可行——句號墨色偏框左下角，安全
        // 凸出量（<1em）只把空白半框推出版心、墨色仍在內（視覺不懸掛）；凸出滿 1em 又會釋放
        // 一字寬、把下一字拉上本行致重疊；且 ResizeObserver 重排時兩階段標記錯亂。原生
        // hanging-punctuation 為正解但 Chrome 不支援、且與本庫 inline-block 原子衝突。
        // 故此處**唯一關卡**鎖死為 squeeze——即使 opts.hanging 為 true 亦不啟用 hang（無逃逸）；
        // hang 之 CSS／lineedge 程式碼保留（休眠），俟原生支援成熟再議。
        lineEnd: "squeeze",
        jiyaConfig: resolveJiya(opts.jiya),
        blocks: Array.isArray(opts.blocks) ? opts.blocks.slice() : [],
        finder: {
            styleInlines: new Set(opts.styleInlines || DEFAULT_STYLE_INLINES),
            blockTags: new Set(opts.blockTags || DEFAULT_BLOCK_TAGS),
            skipTags: new Set(opts.skipTags || DEFAULT_SKIP_TAGS),
            pillSelector: opts.pillSelector || "code, kbd",
            skipAttribute: opts.skipAttribute || null,
            isSkipped: typeof opts.isSkipped === "function" ? opts.isSkipped : null,
        },
    };
}

function resolveRoot(
    arg: Element | string | undefined,
    options: ResolvedOptions,
): Element | null
{
    const pick = arg !== undefined ? arg : options.scope.root;
    if (pick && typeof pick !== "string") { return pick; }
    if (typeof pick === "string" && typeof document !== "undefined")
    {
        return document.querySelector(pick);
    }
    return typeof document !== "undefined" ? document.body : null;
}

export interface Juzhen
{
    render(root?: Element | string): void;
    revert(root?: Element | string): void;
    readonly options: ResolvedOptions;
}

/** 建立一個聚珍實例。 */
export function createJuzhen(opts: JuzhenOptions = {}): Juzhen
{
    const options = normalizeOptions(opts);

    function makeCtx(root: Element): RenderContext
    {
        return { root, options, finder: new Finder(options) };
    }

    return {
        options,
        render(root?: Element | string): void
        {
            const el = resolveRoot(root, options);
            if (!el) { return; }
            runPasses(PASSES, makeCtx(el));
            // margin 後備模式以 root 屬性作 CSS 開關（見 css/_jiya.css）；halt 模式不設。
            if (options.features.jiya && options.jiyaConfig.halfWidth === "margin")
            {
                el.setAttribute("data-jz-halfwidth", "margin");
            }
            // justifyAtoms:false → jz-char／jz-jinze 改 inline（分頁器相容，見 css）。
            if (!options.justifyAtoms)
            {
                el.setAttribute("data-jz-atoms", "inline");
            }
        },
        revert(root?: Element | string): void
        {
            const el = resolveRoot(root, options);
            if (!el) { return; }
            revertPasses(PASSES, makeCtx(el));
            el.removeAttribute("data-jz-halfwidth");
            el.removeAttribute("data-jz-atoms");
        },
    };
}