<?php
header('Content-Type: application/json; charset=UTF-8');

// ------------------------------
// DB 연결
// ------------------------------
$DB_HOST = "localhost";
$DB_NAME = "egbim";
$DB_USER = "egbim";
$DB_PASS = "baron3840!!";

try {
    $pdo = new PDO(
        "mysql:host={$DB_HOST};dbname={$DB_NAME};charset=utf8mb4",
        $DB_USER,
        $DB_PASS,
        [
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        ]
    );
} catch (Exception $e) {
    echo json_encode([
        "status" => "fail",
        "message" => "DB 연결 실패: " . $e->getMessage()
    ]);
    exit;
}

// ------------------------------
// 기준 연도
// ------------------------------
// $year = date("Y");

$START_YEAR = 2025;

$year = isset($_GET['year']) ? (int)$_GET['year'] : $START_YEAR;
if ($year < $START_YEAR) $year = $START_YEAR;

$yearStart = "{$year}-01-01";
$yearEnd   = "{$year}-12-31";

// ------------------------------
// 연간 누적 판매수
// ------------------------------
$total_copy = $pdo->query("
    SELECT COALESCE(SUM(quantity), 0)
    FROM sales_results
    WHERE sales_date BETWEEN '{$yearStart}' AND '{$yearEnd}'
")->fetchColumn();

// ------------------------------
// 연간 매출액
// ------------------------------
$total_amount = $pdo->query("
    SELECT COALESCE(SUM(total_amount), 0)
    FROM sales_results
    WHERE sales_date BETWEEN '{$yearStart}' AND '{$yearEnd}'
")->fetchColumn();

// ------------------------------
// 월별 판매량 (그래프용)
// ------------------------------
$monthly_rows = $pdo->query("
    SELECT MONTH(sales_date) AS m, SUM(quantity) AS qty
    FROM sales_results
    WHERE sales_date BETWEEN '{$yearStart}' AND '{$yearEnd}'
    GROUP BY MONTH(sales_date)
    ORDER BY m
")->fetchAll();

$monthly = array_fill(1, 12, 0);
foreach ($monthly_rows as $row) {
    $monthly[(int)$row['m']] = (int)$row['qty'];
}

// ------------------------------
// 개인별 실적
// ------------------------------
$persons = $pdo->query("
    SELECT m.emp_name, SUM(r.quantity) AS qty
    FROM sales_results r
    JOIN sales_members m 
      ON TRIM(TRAILING ')' FROM SUBSTRING_INDEX(r.emp_no, '(', -1)) = m.emp_no
    WHERE r.sales_date BETWEEN '{$yearStart}' AND '{$yearEnd}'
    GROUP BY r.emp_no
    ORDER BY qty DESC
")->fetchAll();

// ------------------------------
// 업종별 판매 현황 (설계/교육/제작/감리/시공/기타)
// ------------------------------
$biz_rows = $pdo->query("
    SELECT business_type, COUNT(*) AS cnt
    FROM sales_clients
    GROUP BY business_type
")->fetchAll();

$industry = [
    "설계" => 0,
    "교육" => 0,
    "제작" => 0,
    "감리" => 0,
    "시공" => 0,
    "기타" => 0
];

foreach ($biz_rows as $b) {
    if (isset($industry[$b['business_type']])) {
        $industry[$b['business_type']] = (int)$b['cnt'];
    }
}

// ------------------------------
// 기관별 판매 현황 (공공기관/일반기업/교육기관/기타)
// ------------------------------
$org_rows = $pdo->query("
    SELECT org_type, COUNT(*) AS cnt
    FROM sales_clients
    GROUP BY org_type
")->fetchAll();

$institution = [
    "일반기업" => 0,
    "교육기관" => 0,
    "공공기관" => 0,
    "기타" => 0
];

foreach ($org_rows as $o) {
    if (isset($institution[$o['org_type']])) {
        $institution[$o['org_type']] = (int)$o['cnt'];
    }
}

// ------------------------------
// 전체 업체수 (거래처 수)
// ------------------------------
$client_count = $pdo->query("
    SELECT COUNT(*)
    FROM sales_clients
")->fetchColumn();

// ------------------------------
// 월 목표 & 달성률
// ------------------------------
$current_month = "{$year}-" . date("m"); // 연도 고정

// $target_qty = $pdo->query("
//     SELECT COALESCE(target_qty, 0)
//     FROM sales_targets
//     WHERE target_month = '{$current_month}'
//     LIMIT 1
// ")->fetchColumn();
$target_qty = $pdo->query("
    SELECT COALESCE(SUM(target_qty), 0)
    FROM sales_targets
    WHERE target_month = '{$current_month}'
")->fetchColumn();

$month_sales = $pdo->query("
    SELECT COALESCE(SUM(quantity), 0)
    FROM sales_results
    WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$current_month}'
")->fetchColumn();

$target_rate = ($target_qty > 0)
    ? round(($month_sales / $target_qty) * 100, 1)
    : 0;

// ------------------------------
// 당월 매출액
// ------------------------------
$month_sales_amount = $pdo->query("
    SELECT COALESCE(SUM(total_amount), 0)
    FROM sales_results
    WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$current_month}'
")->fetchColumn();

// ------------------------------
// 연간 목표 수량 (1~12월 target 합)
// ------------------------------
$yearly_target_qty = $pdo->query("
    SELECT COALESCE(SUM(target_qty), 0)
    FROM sales_targets
    WHERE LEFT(target_month, 4) = '{$year}'
")->fetchColumn();

// ------------------------------
// 연간 목표 달성률
// ------------------------------
$yearly_rate = ($yearly_target_qty > 0)
    ? round(($total_copy / $yearly_target_qty) * 100, 1)
    : 0;

// // ------------------------------
// // 🔥 [신규] 전월 대비 증감 계산
// // ------------------------------
// $prevMonthDate = strtotime("{$year}-" . date("m") . "-01 -1 month");
// $prev_month = date("Y-m", $prevMonthDate);

// // ⬇ 전월 판매수
// $prev_copy = $pdo->query("
//     SELECT COALESCE(SUM(quantity), 0)
//     FROM sales_results
//     WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$prev_month}'
// ")->fetchColumn();

// // ⬇ 전월 판매액
// $prev_amount = $pdo->query("
//     SELECT COALESCE(SUM(total_amount), 0)
//     FROM sales_results
//     WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$prev_month}'
// ")->fetchColumn();

// // ⬇ 전월 연간 목표 달성률 (전월까지 총합 / 연간 목표)
// $prev_year_copy = $pdo->query("
//     SELECT COALESCE(SUM(quantity), 0)
//     FROM sales_results
//     WHERE sales_date >= '{$year}-01-01'
//       AND sales_date <  '{$prev_month}-01'
// ")->fetchColumn();

// $prev_rate = ($yearly_target_qty > 0)
//     ? round(($prev_year_copy / $yearly_target_qty) * 100, 1)
//     : 0;

// // ------------------------------
// // 🔥 [신규] 차이 계산
// // ------------------------------
// $diff_copy = $total_copy - $prev_year_copy;
// $diff_amount = $total_amount - $prev_amount;
// $diff_rate = $yearly_rate - $prev_rate;




// ------------------------------
// 🔥 [전월 대비] 기준 월 계산
// ------------------------------
$currentYm = "{$year}-" . date('m');                 // 예: 2025-12
$prevYm    = date('Y-m', strtotime("{$currentYm}-01 -1 month")); // 예: 2025-11

// ------------------------------
// 🔥 이번 달 (월 기준) 판매수 / 매출
// ------------------------------
$curr_copy = $pdo->query("
    SELECT COALESCE(SUM(quantity), 0)
    FROM sales_results
    WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$currentYm}'
")->fetchColumn();

$curr_amount = $pdo->query("
    SELECT COALESCE(SUM(total_amount), 0)
    FROM sales_results
    WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$currentYm}'
")->fetchColumn();

// ------------------------------
// 🔥 전월 (월 기준) 판매수 / 매출
// ------------------------------
$prev_copy = $pdo->query("
    SELECT COALESCE(SUM(quantity), 0)
    FROM sales_results
    WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$prevYm}'
")->fetchColumn();

$prev_amount = $pdo->query("
    SELECT COALESCE(SUM(total_amount), 0)
    FROM sales_results
    WHERE DATE_FORMAT(sales_date, '%Y-%m') = '{$prevYm}'
")->fetchColumn();

// ------------------------------
// 🔥 전월 대비 증감 (⭐ 핵심)
// ------------------------------
$diff_copy   = $curr_copy - $prev_copy;        // 예: 166 - 228 = -62
$diff_amount = $curr_amount - $prev_amount;

// ------------------------------
// 🔥 (선택) 달성률도 "월 기준"으로 비교
// ------------------------------
$curr_rate = ($yearly_target_qty > 0)
    ? round(($curr_copy / $yearly_target_qty) * 100, 1)
    : 0;

$prev_rate = ($yearly_target_qty > 0)
    ? round(($prev_copy / $yearly_target_qty) * 100, 1)
    : 0;

$diff_rate = round($curr_rate - $prev_rate, 1);




// ------------------------------
// 이번 달 주차별 판매량
// ------------------------------
$weekly = [
    1 => 0,
    2 => 0,
    3 => 0,
    4 => 0,
    5 => 0
];

$rows = $pdo->query("
    SELECT 
        CEIL(DAY(sales_date) / 7) AS week_no,
        SUM(quantity) AS qty
    FROM sales_results
    WHERE sales_date BETWEEN '{$year}-" . date("m") . "-01'
                        AND LAST_DAY('{$year}-" . date("m") . "-01')
    GROUP BY week_no
")->fetchAll();

foreach ($rows as $r) {
    $week = (int)$r['week_no'];
    if ($week >= 1 && $week <= 5) {
        $weekly[$week] = (int)$r['qty'];
    }
}

// ------------------------------
// 🔥 개인별 연간 실적
// ------------------------------
$members = $pdo->query("
    SELECT DISTINCT emp_no, emp_name, position
    FROM sales_members
")->fetchAll();

// 🔥 표시 순서를 강제 지정 (네가 원하는 순서)
$order = ["J01201", "223070"]; // 권혁진, 염승호

// 🔥 필요한 사람만 필터링
$members = array_filter($members, function($m) use ($order){
    return in_array($m['emp_no'], $order);
});

// 🔥 강제 순서 정렬
usort($members, function($a, $b) use ($order) {
    return array_search($a['emp_no'], $order) <=> array_search($b['emp_no'], $order);
});

$individual = [];

foreach ($members as $m) {
    $emp_no = $m['emp_no'];

    // 월별 판매량
    $rows = $pdo->query("
        SELECT MONTH(sales_date) AS m, SUM(quantity) AS qty
        FROM sales_results
        WHERE TRIM(TRAILING ')' FROM SUBSTRING_INDEX(emp_no, '(', -1)) = '{$emp_no}'
          AND sales_date BETWEEN '{$yearStart}' AND '{$yearEnd}'
        GROUP BY MONTH(sales_date)
        ORDER BY m
    ")->fetchAll();

    $monthly2 = array_fill(1, 12, 0);
    foreach ($rows as $r) {
        $monthly2[(int)$r['m']] = (int)$r['qty'];
    }

    $total2 = array_sum($monthly2);

    $target2 = $pdo->query("
        SELECT COALESCE(SUM(target_qty), 0)
        FROM sales_targets
        WHERE TRIM(TRAILING ')' FROM SUBSTRING_INDEX(emp_no, '(', -1)) = '{$emp_no}'
        AND LEFT(target_month, 4) = '{$year}'
    ")->fetchColumn();

    $rate2 = ($target2 > 0)
        ? round(($total2 / $target2) * 100, 1)
        : 0;

    $individual[] = [
        "emp_no"     => $emp_no,
        "name"       => $m['emp_name'],
        "position"   => $m['position'],
        "monthly"    => array_values($monthly2),
        "total"      => $total2,
        "target_qty" => (int)$target2,
        "rate"       => $rate2
    ];
}

// 📌 이번달 YYYY-MM 구하기
$issueMonth = date("Y-m");

// 📌 이슈 불러오기
$stmt = $pdo->prepare("
    SELECT issue_text
    FROM sales_month_issues
    WHERE issue_month = ?
    LIMIT 1
");
$stmt->execute([$issueMonth]);
$issueText = $stmt->fetchColumn() ?: "";



// ------------------------------
// 최종 JSON 출력
// ------------------------------
echo json_encode([
    "status" => "ok",
    "year" => $year,

    "issue_text" => $issueText,

    // 연간 실적
    "total_copy" => (int)$total_copy,
    "total_amount" => (int)$total_amount,
    "yearly_target_qty" => (int)$yearly_target_qty,
    "yearly_rate" => $yearly_rate,

    // 월별 그래프 데이터
    "monthly" => $monthly,

    // 개인별 / 업종별 / 기관별
    "persons" => $persons,
    "industry" => $industry,
    "institution" => $institution,
    "client_count" => (int)$client_count,

    // 이번 달 목표
    "target_qty" => (int)$target_qty,
    "month_sales" => (int)$month_sales,
    "target_rate" => $target_rate,
    
    "month_sales_amount" => (int)$month_sales_amount, 

    //증감
    "diff_copy" => $diff_copy,
    "diff_amount" => $diff_amount,
    "diff_rate" => $diff_rate,

    "weekly" => $weekly,

    "individual" => $individual,
], JSON_UNESCAPED_UNICODE);
?>