"use strict";

const test = require("node:test");
const assert = require("node:assert/strict");
const fs = require("fs");
const os = require("os");
const path = require("path");

const { buildMimeMessage, sendBackupReportMail, sendTestMail } = require("../lib/mailNotify");

function fakeLogger() {
    const infos = [];
    const warnings = [];
    const errors = [];
    return {
        infos,
        warnings,
        errors,
        info: (msg) => infos.push(msg),
        warn: (msg) => warnings.push(msg),
        error: (msg) => errors.push(msg),
    };
}

test("buildMimeMessage: 添付ファイル無しでも本文がbase64で埋め込まれる", () => {
    const raw = buildMimeMessage({
        from: "a@example.com",
        to: "b@example.com",
        subject: "件名",
        bodyText: "本文テキスト",
    });

    assert.match(raw, /^From: a@example\.com/);
    assert.match(raw, /Subject: =\?UTF-8\?B\?/);
    assert.match(raw, /Content-Type: multipart\/mixed; boundary="/);
    assert.doesNotMatch(raw, /Content-Disposition: attachment/);
});

test("buildMimeMessage: 添付ファイルがあればbase64化して埋め込む", () => {
    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "mail-notify-test-"));
    const attachmentPath = path.join(dir, "backup-202607.log");
    fs.writeFileSync(attachmentPath, "ログ本文");

    const raw = buildMimeMessage({
        from: "a@example.com",
        to: "b@example.com",
        subject: "件名",
        bodyText: "本文",
        attachmentPath,
    });

    assert.match(raw, /Content-Disposition: attachment; filename="backup-202607\.log"/);
    assert.match(raw, new RegExp(Buffer.from("ログ本文", "utf8").toString("base64")));
});

test("sendBackupReportMail: MAIL_FROM/MAIL_TO未設定ならスキップする", async () => {
    delete process.env.MAIL_FROM;
    delete process.env.MAIL_TO;
    const logger = fakeLogger();
    let sendMailCalls = 0;

    await sendBackupReportMail(
        { success: true, hostname: "host", database: "db", elapsedSec: "1.0", logFilePath: "/dev/null" },
        { logger, sendMail: async () => (sendMailCalls += 1) }
    );

    assert.equal(sendMailCalls, 0);
    assert.ok(logger.warnings.some((m) => m.includes("スキップ")));
});

test("sendBackupReportMail: 成功時は成功ラベル入りの件名で送信する", async () => {
    process.env.MAIL_FROM = "from@example.com";
    process.env.MAIL_TO = "to@example.com";
    const logger = fakeLogger();
    const calls = [];

    await sendBackupReportMail(
        { success: true, hostname: "nextoffice2", database: "Implem.Pleasanter", elapsedSec: "12.3", logFilePath: "/dev/null" },
        { logger, sendMail: async (opts) => calls.push(opts) }
    );

    assert.equal(calls.length, 1);
    assert.match(calls[0].subject, /バックアップ成功/);
    assert.match(calls[0].bodyText, /結果: 成功/);
    assert.ok(logger.infos.some((m) => m.includes("メール通知送信成功")));

    delete process.env.MAIL_FROM;
    delete process.env.MAIL_TO;
});

test("sendBackupReportMail: 失敗時は失敗ラベルとエラー内容を含める", async () => {
    process.env.MAIL_FROM = "from@example.com";
    process.env.MAIL_TO = "to@example.com";
    const logger = fakeLogger();
    const calls = [];

    await sendBackupReportMail(
        {
            success: false,
            hostname: "nextoffice2",
            database: "Implem.Pleasanter",
            elapsedSec: "5.0",
            errorMessage: "401 UNAUTHORIZED",
            logFilePath: "/dev/null",
        },
        { logger, sendMail: async (opts) => calls.push(opts) }
    );

    assert.match(calls[0].subject, /バックアップ失敗/);
    assert.match(calls[0].bodyText, /エラー内容: 401 UNAUTHORIZED/);

    delete process.env.MAIL_FROM;
    delete process.env.MAIL_TO;
});

test("sendBackupReportMail: 送信自体が失敗してもERRORログに記録し例外は投げない", async () => {
    process.env.MAIL_FROM = "from@example.com";
    process.env.MAIL_TO = "to@example.com";
    const logger = fakeLogger();

    await sendBackupReportMail(
        { success: true, hostname: "h", database: "d", elapsedSec: "1.0", logFilePath: "/dev/null" },
        {
            logger,
            sendMail: async () => {
                throw new Error("sendmail異常終了 (code=1)");
            },
        }
    );

    assert.ok(logger.errors.some((m) => m.includes("メール通知送信失敗")));

    delete process.env.MAIL_FROM;
    delete process.env.MAIL_TO;
});

test("sendTestMail: MAIL_FROM/MAIL_TO未設定なら例外を投げる", async () => {
    delete process.env.MAIL_FROM;
    delete process.env.MAIL_TO;
    const logger = fakeLogger();

    await assert.rejects(() => sendTestMail({ logger, sendMail: async () => {} }), /MAIL_FROM\/MAIL_TO/);
});

test("sendTestMail: 設定済みならsendMailを1回呼ぶ", async () => {
    process.env.MAIL_FROM = "from@example.com";
    process.env.MAIL_TO = "to@example.com";
    const logger = fakeLogger();
    const calls = [];

    await sendTestMail({ logger, sendMail: async (opts) => calls.push(opts) });

    assert.equal(calls.length, 1);
    assert.equal(calls[0].from, "from@example.com");
    assert.equal(calls[0].to, "to@example.com");
    assert.match(calls[0].subject, /テスト送信/);

    delete process.env.MAIL_FROM;
    delete process.env.MAIL_TO;
});