/**
 * Migration — 2026-07-24-partial-approval.ts
 *
 * Adds the schema needed by the partial-approval flow
 * (sprint-priced items can be approved + sent in batches;
 * unpriced items get cloned to a continuation quote).
 *
 * ## What this script does
 *
 * 1. Reconciles `quotes.status` to add the two new enum values:
 *    `partial_approval_pending` and `partial_approved`.
 *    The existing values are kept; we only APPEND the new ones.
 *    This is the path the operator's "Submit for Approval" /
 *    "Approve & Send" actions take when only some items on the
 *    quote are priced.
 *
 * 2. Adds `parent_quote` (relation → `quotes`, single, optional,
 *    cascadeDelete: false) to the `quotes` collection. When a
 *    continuation quote is created from a partial-approved
 *    parent, the continuation's `parent_quote` points back to
 *    the original. Lets the UI render "Continuation of Q-..."
 *    banners and a "View parent" back-link.
 *
 * 3. Adds `approved_in_batch` (bool, default false) to
 *    `quote_items`. Set to true by /api/v1/quotes/[id]/partial-approve
 *    on the priced items the rep just approved. Gates the
 *    re-submission flow — a second partial approval only
 *    considers items where `approved_in_batch` is still false.
 *
 * 4. Adds `moved_to_quote` (relation → `quotes`, single,
 *    optional, cascadeDelete: false) to `quote_items`. Set by
 *    /api/v1/quotes/[id]/split to the continuation quote an
 *    item was cloned to. The PDF route and approval UI filter
 *    out items where `moved_to_quote != null` so a parent's
 *    PDF/approval state never re-includes items that now
 *    belong to a separate quote.
 *
 * ## Why a migration script (and not "user does it in admin")
 *
 * The user's AGENTS.md rule about "PocketBase select fields are
 * not self-service" is about RUNTIME — if the app code PATCHes a
 * status to a value that doesn't exist, the API 500s. The
 * migration script is exactly the way you add the enum value
 * programmatically. After this runs, the admin UI shows the new
 * values too (and the user can re-order them if they want).
 *
 * ## Idempotency
 *
 * Safe to re-run. Each step reads the current collection state,
 * computes a diff, and only PATCHes if something is missing.
 *
 * ## Run
 *
 *   npx tsx scripts/migrations/2026-07-24-partial-approval.ts
 */
import PocketBase from "pocketbase";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";

function loadEnvFile(name: string) {
  try {
    const raw = readFileSync(resolve(process.cwd(), name), "utf8");
    for (const line of raw.split("\n")) {
      const trimmed = line.trim();
      if (!trimmed || trimmed.startsWith("#")) continue;
      const m = trimmed.match(/^([A-Z0-9_]+)\s*=\s*(.+)$/i);
      if (m && !process.env[m[1]]) {
        process.env[m[1]] = m[2].replace(/^["']|["']$/g, "").trim();
      }
    }
  } catch {
    /* fine — rely on shell env */
  }
}
loadEnvFile(".env");
loadEnvFile(".env.local");

function getAdminPocketBase(): PocketBase {
  const url = process.env.NEXT_PUBLIC_POCKETBASE_URL;
  const email = process.env.PB_ADMIN_EMAIL;
  const password = process.env.PB_ADMIN_PASSWORD;
  if (!url || !email || !password) {
    throw new Error(
      "Set NEXT_PUBLIC_POCKETBASE_URL, PB_ADMIN_EMAIL, PB_ADMIN_PASSWORD (sourced from .env.local).",
    );
  }
  const pb = new PocketBase(url);
  return pb;
}

async function authedPb(): Promise<PocketBase> {
  const pb = getAdminPocketBase();
  await pb
    .collection("_superusers")
    .authWithPassword(
      process.env.PB_ADMIN_EMAIL!,
      process.env.PB_ADMIN_PASSWORD!,
    );
  return pb;
}

const QUOTES = "quotes";
const QUOTE_ITEMS = "quote_items";

/**
 * Target `quotes.status` enum. Mirrors the union in
 * `src/lib/types.ts` → `QuoteStatus`. The migration script is
 * the source of truth for what the live PB actually accepts; the
 * TS type is checked against this in code review.
 */
const TARGET_QUOTE_STATUS_VALUES = [
  "new",
  "claimed",
  "processed",
  "emailed",
  "approval_pending",
  "approved",
  "rejected",
  "problem",
  "complete",
  "cancelled",
  "follow_up",
  "email_failed",
  "unmatched_bounce",
  "template",
  "sending",
  "mail_failed",
  "delivery_note",
  // Added 2026-07-24 — partial-approval flow.
  "partial_approval_pending",
  "partial_approved",
];

type PbField = {
  name: string;
  type: string;
  required?: boolean;
  values?: string[];
  collectionId?: string;
  maxSelect?: number;
  cascadeDelete?: boolean;
  options?: Record<string, unknown>;
  [k: string]: unknown;
};

export async function run(): Promise<void> {
  const pb = await authedPb();

  const quotesCol = await pb.collections.getOne(QUOTES);
  const quoteItemsCol = await pb.collections.getOne(QUOTE_ITEMS);
  const quotesFields = (quotesCol.fields ?? []) as PbField[];
  const itemsFields = (quoteItemsCol.fields ?? []) as PbField[];

  // ── 1. Reconcile quotes.status enum ──────────────────────────
  // APPEND the two new values if missing. We never delete or
  // reorder existing values — backwards compat with already-stored
  // quote rows. PB stores select values as a TOP-LEVEL `values`
  // array (not nested under `options`) — see the gotcha note in
  // the project AGENTS.md and the 2026-07-19 delivery-notes
  // migration that ran into the same trap.
  let nextQuotesFields = quotesFields;
  let statusNeedsUpdate = false;
  const statusField = nextQuotesFields.find(
    (f) => f.name === "status" && f.type === "select",
  );
  const existingValues = new Set(statusField?.values ?? []);
  const missingValues = TARGET_QUOTE_STATUS_VALUES.filter(
    (v) => !existingValues.has(v),
  );
  if (missingValues.length > 0) {
    const merged = [
      ...(statusField?.values ?? []),
      ...missingValues,
    ];
    nextQuotesFields = nextQuotesFields.map((f) =>
      f.name === "status" && f.type === "select"
        ? { ...f, values: merged }
        : f,
    );
    statusNeedsUpdate = true;
  }

  // ── 2. Add parent_quote relation to quotes ───────────────────
  const hasParentQuote = nextQuotesFields.some(
    (f) => f.name === "parent_quote" && f.type === "relation",
  );
  if (!hasParentQuote) {
    nextQuotesFields = [
      ...nextQuotesFields,
      {
        name: "parent_quote",
        type: "relation",
        required: false,
        collectionId: quotesCol.id, // self-reference — set after getOne above
        cascadeDelete: false,
        maxSelect: 1,
      },
    ];
  }

  // ── 3. Add approved_in_batch bool to quote_items ─────────────
  const hasApprovedInBatch = itemsFields.some(
    (f) => f.name === "approved_in_batch" && f.type === "bool",
  );

  // ── 4. Add moved_to_quote relation to quote_items ────────────
  const hasMovedToQuote = itemsFields.some(
    (f) => f.name === "moved_to_quote" && f.type === "relation",
  );

  const itemsNeedsUpdate =
    !hasApprovedInBatch || !hasMovedToQuote;
  let nextItemsFields = itemsFields;
  if (itemsNeedsUpdate) {
    if (!hasApprovedInBatch) {
      nextItemsFields = [
        ...nextItemsFields,
        { name: "approved_in_batch", type: "bool", required: false },
      ];
    }
    if (!hasMovedToQuote) {
      nextItemsFields = [
        ...nextItemsFields,
        {
          name: "moved_to_quote",
          type: "relation",
          required: false,
          collectionId: quotesCol.id, // target = quotes
          cascadeDelete: false,
          maxSelect: 1,
        },
      ];
    }
  }

  // ── Apply the updates ────────────────────────────────────────
  if (statusNeedsUpdate || !hasParentQuote) {
    await pb.collections.update(QUOTES, { fields: nextQuotesFields });
    const parts: string[] = [];
    if (statusNeedsUpdate) {
      parts.push(`status enum +${missingValues.length} value(s)`);
    }
    if (!hasParentQuote) {
      parts.push("added parent_quote relation");
    }
    console.log(
      `[migration:partial-approval] ✓ patched ${QUOTES}: ${parts.join(", ")}`,
    );
  } else {
    console.log(
      `[migration:partial-approval] ${QUOTES} already up to date — skip`,
    );
  }

  if (itemsNeedsUpdate) {
    await pb.collections.update(QUOTE_ITEMS, { fields: nextItemsFields });
    const parts: string[] = [];
    if (!hasApprovedInBatch) parts.push("added approved_in_batch bool");
    if (!hasMovedToQuote) parts.push("added moved_to_quote relation");
    console.log(
      `[migration:partial-approval] ✓ patched ${QUOTE_ITEMS}: ${parts.join(", ")}`,
    );
  } else {
    console.log(
      `[migration:partial-approval] ${QUOTE_ITEMS} already up to date — skip`,
    );
  }

  // ── Verify ───────────────────────────────────────────────────
  const vQuotes = await pb.collections.getOne(QUOTES);
  const vItems = await pb.collections.getOne(QUOTE_ITEMS);
  const vQuotesFields = (vQuotes.fields ?? []) as PbField[];
  const vItemsFields = (vItems.fields ?? []) as PbField[];

  const checks: Array<[string, boolean]> = [
    [
      "quotes.status contains partial_approval_pending",
      (vQuotesFields.find((f) => f.name === "status")?.values ?? []).includes(
        "partial_approval_pending",
      ),
    ],
    [
      "quotes.status contains partial_approved",
      (vQuotesFields.find((f) => f.name === "status")?.values ?? []).includes(
        "partial_approved",
      ),
    ],
    [
      "quotes.parent_quote is a relation to quotes",
      (() => {
        const f = vQuotesFields.find((f) => f.name === "parent_quote");
        return (
          !!f &&
          f.type === "relation" &&
          f.collectionId === vQuotes.id &&
          (f.maxSelect ?? 0) === 1
        );
      })(),
    ],
    [
      "quote_items.approved_in_batch is a bool",
      (() => {
        const f = vItemsFields.find((f) => f.name === "approved_in_batch");
        return !!f && f.type === "bool";
      })(),
    ],
    [
      "quote_items.moved_to_quote is a relation to quotes",
      (() => {
        const f = vItemsFields.find((f) => f.name === "moved_to_quote");
        return (
          !!f &&
          f.type === "relation" &&
          f.collectionId === vQuotes.id &&
          (f.maxSelect ?? 0) === 1
        );
      })(),
    ],
  ];

  let allOk = true;
  for (const [label, ok] of checks) {
    console.log(`  ${ok ? "✓" : "✗"} ${label}`);
    if (!ok) allOk = false;
  }
  if (!allOk) {
    throw new Error(
      "[migration:partial-approval] verification failed — see ✗ lines above",
    );
  }
  console.log("[migration:partial-approval] Migration complete.");
}

if (require.main === module) {
  run().catch((err: unknown) => {
    console.error("[migration:partial-approval] fatal:", err);
    if (err && typeof err === "object" && "response" in err) {
      const e = err as {
        response?: { data?: unknown };
        originalError?: { data?: unknown };
        data?: unknown;
        message?: string;
      };
      console.error(
        "Full error:",
        JSON.stringify(
          {
            message: e.message,
            responseData: e.response?.data ?? e.originalError?.data ?? e.data,
          },
          null,
          2,
        ),
      );
    }
    process.exit(1);
  });
}