#!/usr/bin/env node
/**
 * CLI for the lived-specifics bank (Fix #2 — kilde-så-draft).
 *
 *   node --import tsx src/cli.ts query --tags <a,b>   [--bank <path>] [--json]
 *   node --import tsx src/cli.ts add   --type <t> --content "<text>" --tags <a,b>
 *                                       [--source <s>] [--verification <v>] [--bank <path>]
 *   node --import tsx src/cli.ts list  [--bank <path>] [--json]
 *
 * The command layer (Step 1.5) calls `query` to surface inventory the operator
 * already has for an edition's topics, and `add` to fold newly-elicited material
 * back in. Deterministic store; the elicitation interview itself lives upstream.
 *
 * Exit code: 0 on success, 2 on usage error.
 */

import { readFileSync, writeFileSync } from "node:fs";

import {
  addSpecific,
  defaultBankPath,
  loadBank,
  queryByTopic,
  saveBank,
} from "./bank.js";
import { validateBinding } from "./binding.js";
import { renderKilder } from "./kilder.js";
import type { LivedSpecifics } from "./binding.js";
import type { SpecificType, Verification } from "./types.js";

const VALID_TYPES: SpecificType[] = [
  "number",
  "named-case",
  "what-broke",
  "contrarian",
  "mind-change",
  "other",
];
const VALID_VERIFICATION: Verification[] = ["verified", "unverified", "n/a"];

function parseFlags(args: string[]): Record<string, string> {
  const out: Record<string, string> = {};
  for (let i = 0; i < args.length; i++) {
    const a = args[i];
    if (a.startsWith("--")) {
      const key = a.slice(2);
      const next = args[i + 1];
      if (next === undefined || next.startsWith("--")) {
        out[key] = "true";
      } else {
        out[key] = next;
        i++;
      }
    }
  }
  return out;
}

function splitTags(raw: string | undefined): string[] {
  if (!raw) return [];
  return raw
    .split(",")
    .map((t) => t.trim())
    .filter((t) => t.length > 0);
}

function usage(msg: string): never {
  console.error(`error: ${msg}`);
  console.error(
    "usage:\n" +
      "  query --tags <a,b> [--bank <path>] [--json]\n" +
      '  add --type <t> --content "<text>" --tags <a,b> [--source <s>] [--verification <v>] [--bank <path>]\n' +
      "  list [--bank <path>] [--json]\n" +
      "  validate-binding --edition <edition-state.json> [--article <id>] [--bank <path>] [--json]\n" +
      "  render-kilder    --edition <edition-state.json> [--article <id>] [--bank <path>] [--out <path>]",
  );
  process.exit(2);
}

/** Minimal shape of edition-state.json that the binding subcommands read. */
interface EditionArticle {
  title?: string;
  livedSpecifics?: LivedSpecifics;
}
interface EditionState {
  currentArticle?: string;
  articles?: Record<string, EditionArticle>;
}

const EMPTY_LS: LivedSpecifics = { slots: [], status: "pending" };

function loadEdition(path: string): EditionState {
  return JSON.parse(readFileSync(path, "utf8")) as EditionState;
}

/** Resolve the target article: explicit --article, else currentArticle, else "01". */
function resolveArticle(edition: EditionState, flag?: string): { id: string; article: EditionArticle } {
  const id = flag ?? edition.currentArticle ?? "01";
  return { id, article: edition.articles?.[id] ?? {} };
}

function today(): string {
  return new Date().toISOString().slice(0, 10);
}

function main(): void {
  const [command, ...rest] = process.argv.slice(2);
  const flags = parseFlags(rest);
  const bankPath = flags.bank ?? defaultBankPath();
  const asJson = flags.json === "true";

  if (command === "query") {
    const tags = splitTags(flags.tags);
    if (tags.length === 0) usage("query needs --tags <a,b>");
    const hits = queryByTopic(loadBank(bankPath), tags);
    if (asJson) {
      console.log(JSON.stringify(hits, null, 2));
      return;
    }
    if (hits.length === 0) {
      console.log(`No lived specifics found for tags: ${tags.join(", ")}`);
      console.log("→ elicit fresh material from the operator (Step 1.5), then `add` it.");
      return;
    }
    console.log(`${hits.length} lived specific(s) for: ${tags.join(", ")}`);
    for (const { specific, tagOverlap } of hits) {
      const v = specific.verification === "verified" ? "" : ` [${specific.verification}]`;
      console.log(`\n  · (${specific.type}, overlap ${tagOverlap})${v} ${specific.content}`);
      console.log(`    tags: ${specific.topicTags.join(", ")} — from ${specific.provenance.source}`);
    }
    return;
  }

  if (command === "add") {
    const type = flags.type as SpecificType;
    if (!VALID_TYPES.includes(type)) usage(`--type must be one of: ${VALID_TYPES.join(", ")}`);
    const content = flags.content;
    if (!content || content === "true") usage("add needs --content \"<text>\"");
    const tags = splitTags(flags.tags);
    if (tags.length === 0) usage("add needs --tags <a,b>");
    const verification = (flags.verification as Verification) ?? "unverified";
    if (!VALID_VERIFICATION.includes(verification)) {
      usage(`--verification must be one of: ${VALID_VERIFICATION.join(", ")}`);
    }
    const bank = loadBank(bankPath);
    const res = addSpecific(bank, {
      type,
      content,
      topicTags: tags,
      provenance: { capturedAt: today(), source: flags.source ?? "manual" },
      verification,
    });
    saveBank(bankPath, res.bank);
    if (res.added) {
      console.log(`Added (${type}): ${content}`);
    } else {
      console.log(`Duplicate — already in bank${res.merged ? " (tags unioned)" : ""}: ${content}`);
    }
    console.log(`Bank: ${bankPath} (${res.bank.specifics.length} specifics)`);
    return;
  }

  if (command === "list") {
    const bank = loadBank(bankPath);
    if (asJson) {
      console.log(JSON.stringify(bank, null, 2));
      return;
    }
    console.log(`Bank: ${bankPath} — ${bank.specifics.length} specific(s)`);
    for (const s of bank.specifics) {
      const flag = s.status === "active" ? "" : ` (${s.status})`;
      console.log(`  · [${s.type}]${flag} ${s.content}  {${s.topicTags.join(", ")}}`);
    }
    return;
  }

  if (command === "validate-binding") {
    if (!flags.edition || flags.edition === "true") usage("validate-binding needs --edition <path>");
    const edition = loadEdition(flags.edition);
    const { id, article } = resolveArticle(edition, flags.article);
    const ls = article.livedSpecifics ?? EMPTY_LS;
    const res = validateBinding(ls, loadBank(bankPath));
    if (asJson) {
      console.log(JSON.stringify({ article: id, ...res }, null, 2));
    } else {
      const c = res.coverage;
      console.log(`Binding for article ${id}: ${res.verdict}`);
      console.log(
        `  slots ${c.total} — levd ${c.specific} · abstrakt ${c.abstrakt} · ekstern ${c.ekstern} · uavklart ${c.unresolved}`,
      );
      for (const p of res.problems) console.log(`  ⛔ ${p.slotId}: ${p.reason} — ${p.detail}`);
      for (const w of res.warnings) console.log(`  ⚠ ${w.slotId}: ${w.detail}`);
    }
    process.exit(res.verdict === "BLOCK" ? 1 : 0);
  }

  if (command === "render-kilder") {
    if (!flags.edition || flags.edition === "true") usage("render-kilder needs --edition <path>");
    const edition = loadEdition(flags.edition);
    const { id, article } = resolveArticle(edition, flags.article);
    const md = renderKilder({
      articleId: id,
      title: article.title ?? id,
      livedSpecifics: article.livedSpecifics ?? EMPTY_LS,
      bank: loadBank(bankPath),
    });
    if (flags.out && flags.out !== "true") {
      writeFileSync(flags.out, md, "utf8");
      console.log(`Wrote ${flags.out}`);
    } else {
      process.stdout.write(md);
    }
    return;
  }

  usage(command ? `unknown command: ${command}` : "no command given");
}

main();