import { randomBytes } from "crypto";
import logger from "./logger.js";
import { queryWithRetry } from "./db.js";
// In-memory cache for fast lookups, synced with PostgreSQL
let keysCache = [];
/** Look up a key row in the DB by a given column. Returns null if not found. */
export async function findKeyInCacheOrDb(column, value) {
    const result = await queryWithRetry(`SELECT key, tier, email, created_at, stripe_customer_id FROM api_keys WHERE ${column} = $1 LIMIT 1`, [value]);
    if (result.rows.length === 0)
        return null;
    const r = result.rows[0];
    return {
        key: r.key,
        tier: r.tier,
        email: r.email,
        createdAt: r.created_at instanceof Date ? r.created_at.toISOString() : r.created_at,
        stripeCustomerId: r.stripe_customer_id || undefined,
    };
}
export async function loadKeys() {
    try {
        const result = await queryWithRetry("SELECT key, tier, email, created_at, stripe_customer_id FROM api_keys");
        keysCache = result.rows.map((r) => ({
            key: r.key,
            tier: r.tier,
            email: r.email,
            createdAt: r.created_at instanceof Date ? r.created_at.toISOString() : r.created_at,
            stripeCustomerId: r.stripe_customer_id || undefined,
        }));
    }
    catch (err) {
        logger.error({ err }, "Failed to load keys from PostgreSQL");
        keysCache = [];
    }
    // Also load seed keys from env
    const envKeys = process.env.API_KEYS?.split(",").map((k) => k.trim()).filter(Boolean) || [];
    for (const k of envKeys) {
        if (!keysCache.find((e) => e.key === k)) {
            const entry = { key: k, tier: "pro", email: "seed@docfast.dev", createdAt: new Date().toISOString() };
            keysCache.push(entry);
            // Upsert into DB
            await queryWithRetry(`INSERT INTO api_keys (key, tier, email, created_at) VALUES ($1, $2, $3, $4)
         ON CONFLICT (key) DO NOTHING`, [k, "pro", "seed@docfast.dev", new Date().toISOString()]).catch(() => { });
        }
    }
}
export function isValidKey(key) {
    return keysCache.some((k) => k.key === key);
}
export function getKeyInfo(key) {
    return keysCache.find((k) => k.key === key);
}
export function isProKey(key) {
    const info = getKeyInfo(key);
    return info?.tier === "pro";
}
function generateKey(prefix) {
    return `${prefix}_${randomBytes(24).toString("hex")}`;
}
export async function createFreeKey(email) {
    if (email) {
        const existing = keysCache.find((k) => k.email === email && k.tier === "free");
        if (existing)
            return existing;
    }
    const entry = {
        key: generateKey("df_free"),
        tier: "free",
        email: email || "",
        createdAt: new Date().toISOString(),
    };
    await queryWithRetry("INSERT INTO api_keys (key, tier, email, created_at) VALUES ($1, $2, $3, $4)", [entry.key, entry.tier, entry.email, entry.createdAt]);
    keysCache.push(entry);
    return entry;
}
export async function createProKey(email, stripeCustomerId) {
    // Check in-memory cache first (fast path)
    const existing = keysCache.find((k) => k.stripeCustomerId === stripeCustomerId);
    if (existing) {
        existing.tier = "pro";
        await queryWithRetry("UPDATE api_keys SET tier = 'pro' WHERE key = $1", [existing.key]);
        return existing;
    }
    // UPSERT: handles duplicate webhooks across pods via DB unique index
    const newKey = generateKey("df_pro");
    const now = new Date().toISOString();
    const result = await queryWithRetry(`INSERT INTO api_keys (key, tier, email, created_at, stripe_customer_id)
     VALUES ($1, $2, $3, $4, $5)
     ON CONFLICT (stripe_customer_id) WHERE stripe_customer_id IS NOT NULL
     DO UPDATE SET tier = 'pro'
     RETURNING key, tier, email, created_at, stripe_customer_id`, [newKey, "pro", email, now, stripeCustomerId]);
    const row = result.rows[0];
    const entry = {
        key: row.key,
        tier: row.tier,
        email: row.email,
        createdAt: row.created_at instanceof Date ? row.created_at.toISOString() : row.created_at,
        stripeCustomerId: row.stripe_customer_id || undefined,
    };
    // Refresh in-memory cache
    const cacheIdx = keysCache.findIndex((k) => k.stripeCustomerId === stripeCustomerId);
    if (cacheIdx >= 0) {
        keysCache[cacheIdx] = entry;
    }
    else {
        keysCache.push(entry);
    }
    return entry;
}
export async function downgradeByCustomer(stripeCustomerId) {
    const entry = keysCache.find((k) => k.stripeCustomerId === stripeCustomerId);
    if (entry) {
        entry.tier = "free";
        await queryWithRetry("UPDATE api_keys SET tier = 'free' WHERE stripe_customer_id = $1", [stripeCustomerId]);
        return true;
    }
    // DB fallback: key may exist on another pod's cache or after a restart
    logger.info({ stripeCustomerId }, "downgradeByCustomer: cache miss, falling back to DB");
    const dbKey = await findKeyInCacheOrDb("stripe_customer_id", stripeCustomerId);
    if (!dbKey) {
        logger.warn({ stripeCustomerId }, "downgradeByCustomer: customer not found in cache or DB");
        return false;
    }
    await queryWithRetry("UPDATE api_keys SET tier = 'free' WHERE stripe_customer_id = $1", [stripeCustomerId]);
    dbKey.tier = "free";
    keysCache.push(dbKey);
    logger.info({ stripeCustomerId, key: dbKey.key }, "downgradeByCustomer: downgraded via DB fallback");
    return true;
}
export async function findKeyByCustomerId(stripeCustomerId) {
    return findKeyInCacheOrDb("stripe_customer_id", stripeCustomerId);
}
export function getAllKeys() {
    return [...keysCache];
}
export async function updateKeyEmail(apiKey, newEmail) {
    const entry = keysCache.find((k) => k.key === apiKey);
    if (entry) {
        entry.email = newEmail;
        await queryWithRetry("UPDATE api_keys SET email = $1 WHERE key = $2", [newEmail, apiKey]);
        return true;
    }
    // DB fallback: key may exist on another pod's cache or after a restart
    logger.info({ apiKey: apiKey.slice(0, 10) + "..." }, "updateKeyEmail: cache miss, falling back to DB");
    const dbKey = await findKeyInCacheOrDb("key", apiKey);
    if (!dbKey) {
        logger.warn({ apiKey: apiKey.slice(0, 10) + "..." }, "updateKeyEmail: key not found in cache or DB");
        return false;
    }
    await queryWithRetry("UPDATE api_keys SET email = $1 WHERE key = $2", [newEmail, apiKey]);
    dbKey.email = newEmail;
    keysCache.push(dbKey);
    logger.info({ apiKey: apiKey.slice(0, 10) + "..." }, "updateKeyEmail: updated via DB fallback");
    return true;
}
export async function updateEmailByCustomer(stripeCustomerId, newEmail) {
    const entry = keysCache.find(k => k.stripeCustomerId === stripeCustomerId);
    if (entry) {
        entry.email = newEmail;
        await queryWithRetry("UPDATE api_keys SET email = $1 WHERE stripe_customer_id = $2", [newEmail, stripeCustomerId]);
        return true;
    }
    // DB fallback: key may exist on another pod's cache or after a restart
    logger.info({ stripeCustomerId }, "updateEmailByCustomer: cache miss, falling back to DB");
    const dbKey = await findKeyInCacheOrDb("stripe_customer_id", stripeCustomerId);
    if (!dbKey) {
        logger.warn({ stripeCustomerId }, "updateEmailByCustomer: customer not found in cache or DB");
        return false;
    }
    await queryWithRetry("UPDATE api_keys SET email = $1 WHERE stripe_customer_id = $2", [newEmail, stripeCustomerId]);
    dbKey.email = newEmail;
    keysCache.push(dbKey);
    logger.info({ stripeCustomerId, key: dbKey.key }, "updateEmailByCustomer: updated via DB fallback");
    return true;
}