<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);

header("Content-Type: application/json; charset=utf-8");

try {
    $pdo = new PDO(
        "mysql:host=localhost;dbname=egbim;charset=utf8mb4",
        "egbim",
        "baron3840!!",
        [
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
        ]
    );
} catch(Exception $e) {
    echo json_encode(["status"=>"error","message"=>"DB 연결 실패"]);
    exit;
}

$action = $_POST['action'] ?? $_GET['action'] ?? "";

/* ===========================
    1) 전체 일정 + 직원 목록
=========================== */
if ($action === "month") {

    $year  = $_GET['year']  ?? date("Y");
    $month = $_GET['month'] ?? date("m");

    // 직원 목록
    $employees = $pdo->query("
        SELECT emp_no, emp_name 
        FROM sales_members
        ORDER BY emp_name ASC
    ")->fetchAll();

    // 해당 월 전체 일정
    $stmt = $pdo->prepare("
        SELECT 
            s.seq_no,
            s.schedule_date,
            s.time_period,
            s.client_code,
            c.client_name,
            s.emp_no,
            s.content,
            s.status
        FROM sales_schedules s
        LEFT JOIN sales_clients c ON s.client_code = c.client_code
        WHERE DATE_FORMAT(s.schedule_date, '%Y-%m') = ?
        ORDER BY s.schedule_date ASC
    ");
    $stmt->execute([ "$year-$month" ]);
    $schedules = $stmt->fetchAll();

    echo json_encode([
        "status" => "ok",
        "employees" => $employees,
        "schedules" => $schedules
    ]);
    exit;
}


/* ===========================
    2) INSERT
=========================== */
if ($action === "insert") {
    $seq = $pdo->query("SELECT IFNULL(MAX(seq_no), 0) + 1 AS next_no FROM sales_schedules")
            ->fetch()['next_no'];

    $stmt = $pdo->prepare("
        INSERT INTO sales_schedules (seq_no, schedule_date, client_code, emp_no, content, status)
        VALUES (?, ?, ?, ?, ?, ?)
    ");

    $stmt->execute([
        $seq,
        $_POST['schedule_date'],
        $_POST['client_code'],
        $_POST['emp_no'],
        $_POST['content'],
        $_POST['status']
    ]);

    echo json_encode(["status" => "ok"]);
    exit;
}


/* ===========================
    3) UPDATE
=========================== */
if ($action === "update") {

    // 🔥 emp_no 필수 확인
    if (empty($_POST['emp_no'])) {
        echo json_encode([
            "status" => "fail",
            "message" => "emp_no missing in update"
        ]);
        exit;
    }

    $stmt = $pdo->prepare("
        UPDATE sales_schedules
        SET schedule_date=?, time_period=?, client_code=?, emp_no=?, content=?, status=?, updated_at=NOW()
        WHERE seq_no=?
    ");

    $stmt->execute([
        $_POST['schedule_date'],
        $_POST['time_period'],
        $_POST['client_code'],
        $_POST['emp_no'],
        $_POST['content'],
        $_POST['status'],
        $_POST['seq_no']
    ]);

    echo json_encode(["status" => "ok"]);
    exit;
}


/* ===========================
    4) DELETE
=========================== */
if ($action === "delete") {

    $stmt = $pdo->prepare("DELETE FROM sales_schedules WHERE seq_no=?");
    $stmt->execute([ $_POST['seq_no'] ]);

    echo json_encode(["status"=>"ok"]);
    exit;
}


//대시보드 캘린더 요청 API
if ($action === "calendar") {

    $year = $_GET['year'] ?? date("Y");
    $month = $_GET['month'] ?? date("m");
    $ym = "$year-$month";

    $stmt = $pdo->prepare("
        SELECT 
            s.schedule_date,
            s.time_period,
            s.content,
            s.status,
            m.emp_name,
            c.client_name
        FROM sales_schedules s
        LEFT JOIN sales_members m ON s.emp_no = m.emp_no
        LEFT JOIN sales_clients c ON s.client_code = c.client_code
        WHERE DATE_FORMAT(s.schedule_date,'%Y-%m') = ?
        ORDER BY s.schedule_date, s.time_period
    ");
    $stmt->execute([$ym]);
    $rows = $stmt->fetchAll();

    $result = [];

    foreach ($rows as $r) {
        $date = $r['schedule_date'];

        // 담당자 첫글자 → 기존 UI에서 color tag 로 사용
        $tag = mb_substr($r['emp_name'], 0, 1);

        $result[$date][] = [
            "title" => $r['client_name'] ?: '',
            "desc"  => $r['content'],
            "time"  => $r['time_period'],
            "status" => $r['status'],
            "tags"  => [$tag]
        ];
    }

    echo json_encode(["status" => "ok", "events" => $result]);
    exit;
}


echo json_encode(["status"=>"fail","message"=>"잘못된 요청"]);
exit;
?>