#!/usr/bin/env bun

/**
 * delib-monorepo-refs — scrub genesis / monorepo / stage / OpenSpec metadata
 * from individual library README.md files so they read as standalone packages.
 *
 * Usage:
 *   bun scripts/delib-monorepo-refs.ts            # rewrite
 *   bun scripts/delib-monorepo-refs.ts --dry-run  # preview
 */

import { readFileSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import { CONFIG } from "./lib/config.js";
import { walkMd } from "./lib/doc-tree.js";

const ROOT = CONFIG.paths.root;
const PACKAGES_ROOT = join(ROOT, CONFIG.paths.packagesRoot);

const REPLACEMENTS: { pattern: RegExp; replacement: string; note?: string }[] = [
    // 1. Strip OpenSpec link blocks (won't resolve on npm)
    {
        pattern: /\n?<!-- begin:auto-spec-link -->[\s\S]*?<!-- end:auto-spec-link -->\n?/g,
        replacement: "\n",
        note: "OpenSpec block",
    },

    // 2. Stand-alone "## OpenSpec" heading + following spec-link line
    {
        pattern: /\n?## OpenSpec\n\nCanonical capability spec: `?[^`\n]+`?\.[ \t]*\n?/g,
        replacement: "\n",
        note: "OpenSpec heading",
    },

    // 3. Remove Stage-N.N prefix from H1 title lines
    {
        pattern:
            /^(# @suaveplan\/[\w-]+)\s+-\s+Stage-?\d+(?:\.\d+)?\s+/gim,
        replacement: "$1 — ",
        note: "Stage in H1",
    },

    // 4. Remove Stage-N.N at start of sentences / lines (common prose prefix)
    {
        pattern:
            /([.\n]|^)\s*Stage-?\d+(?:\.\d+)?\s+(concrete|abstract|trivial|bridge|rolled|Better-Auth|contract|package|audit|fixed-principal|session resolver|JWT|service-to-service|in-memory|reference|HTTP|WebSocket|in-process|fixed-Principal|concrete Hono|concrete GraphQL|concrete WebAssembly|concrete Apollo|concrete static|concrete tenant|concrete database|concrete event|concrete job|concrete logger|concrete manifest|concrete migration|concrete OpenAPI|concrete rate-limit|concrete router|concrete saga|concrete sandbox|concrete secrets|concrete SSE|concrete WS|concrete worker|concrete WS broker|concrete WS Bun)\b/gi,
        replacement: "$1$2",
        note: "Stage prefix",
    },

    // 5. Remove orphaned "Stage-N.N" that stands alone mid-sentence
    {
        pattern: /\bStage-?\d+(?:\.\d+)?\b/gi,
        replacement: "",
        note: "orphaned Stage",
    },

    // 6. "Genesis Stage N — …" sentences
    {
        pattern:
            /\bGenesis Stage \d+(?:\.\d+)?[^.]*\.\s*/gi,
        replacement: "",
        note: "Genesis Stage sentence",
    },

    // 7. "Genesis-wave package …" sentences
    {
        pattern: /\bGenesis-wave package[^.]*\.\s*/gi,
        replacement: "",
        note: "Genesis-wave sentence",
    },

    // 8. "Per design doc §N.N, genesis ships …" sentences
    {
        pattern:
            /\bPer design doc §\d+(?:\.\d+)*,\s+genesis\s+[^.]*\.\s*/gi,
        replacement: "",
        note: "design-doc genesis sentence",
    },

    // 9. "the Suaveplan monorepo" / "for the Suaveplan monorepo"
    {
        pattern: /\bfor the Suaveplan monorepo\b/gi,
        replacement: "for Suaveplan",
        note: "monorepo ref",
    },
    {
        pattern: /\bthe Suaveplan monorepo\b/gi,
        replacement: "Suaveplan",
        note: "monorepo ref",
    },

    // 10. "the genesis monorepo"
    {
        pattern: /\bthe genesis monorepo\b/gi,
        replacement: "Suaveplan",
        note: "genesis monorepo",
    },

    // 11. "genesis `@suaveplan/...`" -> just the package name
    {
        pattern: /\bgenesis\s+(`@suaveplan\/[^`]+`)/gi,
        replacement: "$1",
        note: "genesis pkg prefix",
    },

    // 12. "for the `@suaveplan/api` plugin foundation"
    {
        pattern:
            /\bfor the `@suaveplan\/api` plugin foundation\b/gi,
        replacement: "for `@suaveplan/api`",
        note: "plugin foundation",
    },
    {
        pattern:
            /\bthe `@suaveplan\/api` plugin foundation\b/gi,
        replacement: "`@suaveplan/api`",
        note: "plugin foundation",
    },
    {
        pattern: /\bplugin foundation\b/gi,
        replacement: "plugin system",
        note: "plugin foundation",
    },

    // 13. Loose "genesis" when clearly referring to the project (not a name)
    {
        pattern: /\bgenesis (fix|package|design|crypto|wave|monorepo)\b/gi,
        replacement: "$1",
        note: "genesis adjective",
    },

    // 14. "openspec/changes/..." paths in prose
    {
        pattern: /`?\.\.\/\.\.\/\.\.\/\.\.\/openspec\/[^`\n]+`?/g,
        replacement: "the spec",
        note: "openspec path",
    },

    // 15. "OpenSpec change" / "OpenSpec-tracked"
    {
        pattern: /\bOpenSpec change\b/gi,
        replacement: "spec change",
        note: "OpenSpec change",
    },
    {
        pattern: /\bOpenSpec-tracked\b/gi,
        replacement: "tracked",
        note: "OpenSpec-tracked",
    },

    // 16. "of the umbrella plan (openspec/changes/...)"
    {
        pattern:
            /\bof the umbrella plan\s*\([^)]+openspec[^)]+\)\b/gi,
        replacement: "of the design",
        note: "umbrella plan",
    },

    // 17. "Stage N of the umbrella plan"
    {
        pattern:
            /\bStage \d+(?:\.\d+)?\s+of the umbrella plan\b/gi,
        replacement: "the design",
        note: "Stage umbrella plan",
    },
];

function scrub(content: string): { next: string; hits: string[] } {
    let next = content;
    const hits: string[] = [];

    for (const { pattern, replacement, note } of REPLACEMENTS) {
        const before = next;
        next = next.replace(pattern, replacement);
        if (next !== before && note) {
            hits.push(note);
        }
    }

    // Collapse multiple blank lines left behind
    next = next.replace(/\n{3,}/g, "\n\n");

    return { next, hits };
}

function main(): void {
    const dryRun = process.argv.slice(2).includes("--dry-run");

    const readmes = walkMd(PACKAGES_ROOT, {
        ignoreDirs: ["node_modules", "dist", "build", "coverage", ".turbo"],
    }).filter((p) => basename(p) === "README.md");

    let changed = 0;
    let unchanged = 0;
    const report: string[] = [];

    for (const readmePath of readmes) {
        const content = readFileSync(readmePath, "utf-8");
        const { next, hits } = scrub(content);
        if (next === content) {
            unchanged++;
            continue;
        }

        const rel = readmePath.replace(ROOT + "/", "");
        const uniqueHits = [...new Set(hits)];
        report.push(`${rel}  (${uniqueHits.join(", ")})`);

        if (!dryRun) {
            writeFileSync(readmePath, next);
        }
        changed++;
    }

    console.log("");
    console.log(`✏️  Changed:    ${changed}`);
    console.log(`⏭️  Unchanged:  ${unchanged}`);

    if (report.length > 0) {
        console.log("");
        console.log("Files touched:");
        for (const line of report) console.log(`  ${line}`);
    }

    if (dryRun) {
        console.log("");
        console.log("(Dry-run — no files were written.)");
    }
}

function basename(p: string): string {
    return p.slice(p.lastIndexOf("/") + 1);
}

main();