<?php
include "bootstrap.php";

/////////GET BOOKS/////////
function getBooks($pdo){
    $stmt = $pdo->query("SELECT bookID, title, author FROM books ORDER BY title ASC");
    $books = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $books;
}

/////////GET BORROWERS/////////
function getBorrowers($pdo){
    $stmt = $pdo->query("SELECT * FROM borrowers ORDER BY lastName ASC");
    $borrowers = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $borrowers;
}

/////////GET AVAILABLE COPIES OF BOOK/////////
function getAvailableCopiesOfBook($pdo, $bookID){
    $stmt = $pdo->query("SELECT * FROM copies WHERE bookID = $bookID AND isBorrowed = 0 ORDER BY copyID ASC");
    $copies = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $copies;
}

/////////GET BORROWED COPIES OF BORROWER/////////
function getBorrowedCopiesOfBorrower($pdo, $borrowerID){
    $stmt = $pdo->query("SELECT
                            loans.loanID,
                            loans.copyID,
                            copies.bookCondition as bookCondition,
                            books.title as bookTitle,
                            books.author as bookAuthor
                        FROM loans
                        INNER JOIN copies ON loans.copyID = copies.copyID
                        INNER JOIN books ON copies.bookID = books.bookID
                        WHERE borrowerID = $borrowerID AND returnedDate IS NULL
                        ORDER BY copyID ASC");
    $copies = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $copies;
}

/////////GET ACTIVE LOANS/////////
function getActiveLoans($pdo){
    $stmt = $pdo->query("SELECT
                            loans.*,
                            books.title as bookTitle,
                            books.author as bookAuthor,
                            borrowers.firstName as firstName,
                            borrowers.lastName as lastName,
                            borrowers.role as borrowerRole
                        FROM loans
                        INNER JOIN copies ON loans.copyID = copies.copyID
                        INNER JOIN books ON copies.bookID = books.bookID
                        INNER JOIN borrowers on loans.borrowerID = borrowers.borrowerID
                        WHERE loans.returnedDate IS NULL
                        ORDER BY dueDate ASC");
    $activeLoans = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $activeLoans;
}

/////////GET LATE LOANS/////////
function getLateLoans($pdo){
    $currentDate = date("Y-m-d");

    $sql = "SELECT
                loans.*,
                books.title as bookTitle,
                books.author as bookAuthor,
                borrowers.firstName as firstName,
                borrowers.lastName as lastName,
                borrowers.role as borrowerRole
            FROM loans
            INNER JOIN copies ON loans.copyID = copies.copyID
            INNER JOIN books ON copies.bookID = books.bookID
            INNER JOIN borrowers on loans.borrowerID = borrowers.borrowerID
            WHERE loans.dueDate < ? AND loans.returnedDate IS NULL
            ORDER BY dueDate ASC";
    $stmt = $pdo->prepare($sql);
    $stmt->execute([$currentDate]);

    $lateLoans = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $lateLoans;
}

/////////ADD COPIES/////////
function addCopies($pdo, $bookID, $amount, $copyCondition){
    for($i=0; $i<$amount; $i++){
                $sql = "INSERT INTO copies (bookID, bookCondition) VALUES (:bookID, :bookCondition)";
                $stmt = $pdo->prepare($sql);
                $stmt->bindParam(':bookID', $bookID);
                $stmt->bindParam(':bookCondition', $copyCondition);

                try {
                    $stmt->execute();
                    $successfullyAdded = true;
                } catch (PDOException $e) {
                    echo "<p>Error: " . $e->getMessage() . "</p>";
                }
            }
            if($successfullyAdded){
                if($amount > 1)
                {
                    echo $amount . " Copies added successfully!";
                }else{
                    echo "Copy added successfully!";
                }
            }
}

/////////ADD BOOK/////////
function addBook($pdo, $title, $author, $area){
    $sql = "INSERT INTO books (title, author, areaOfStudy) VALUES (:title, :author, :area)";
            $stmt = $pdo->prepare($sql);
            $stmt->bindParam(':title', $title);
            $stmt->bindParam(':author', $author);
            $stmt->bindParam(':area', $area);

            try {
                $stmt->execute();
                echo "<p>Book added successfully!</p>";
            } catch (PDOException $e) {
                echo "<p>Error: " . $e->getMessage() . "</p>";
            }
}

/////////ADD BORROWER/////////
function addBorrower($pdo, $firstname, $lastname, $role){
    $sql = "INSERT INTO borrowers (firstname, lastname, role) VALUES (:firstname, :lastname, :role)";
        $stmt = $pdo->prepare($sql);
        $stmt->bindParam(":firstname", $firstname);
        $stmt->bindParam(":lastname", $lastname);
        $stmt->bindParam(":role", $role);

        try{
            $stmt->execute();
            echo "<p>Borrowers added!</p>";
        }catch(PDOException $e){
            echo "<p>Error: " . $e->getMessage() . "</p>";
        }
}

/////////ADD LOAN/////////
function addLoan($pdo, $copyID, $borrowerID, $borrowedDate, $dueDate){
    $sql = "INSERT INTO loans (copyID, borrowerID, borrowedDate, dueDate) VALUES (:copyID, :borrowerID, :borrowedDate, :dueDate)";
        $stmt = $pdo->prepare($sql);
        $stmt->bindParam(":copyID", $copyID);
        $stmt->bindParam("borrowerID", $borrowerID);
        $stmt->bindParam("borrowedDate", $borrowedDate);
        $stmt->bindParam(":dueDate", $dueDate);

        try{
            $stmt->execute();
            echo "<p>Loan added!</p>";
        }catch(PDOException $e){
            echo "<p>Error: " . $e->getMessage() . "</p>";
        }
    
    $sql = "UPDATE copies SET isBorrowed=? WHERE copyID=?";
    $stmt = $pdo->prepare($sql);
    $stmt->execute([1, $copyID]);
}

/////////REMOVE LOAN/////////
function removeLoan($pdo, $copyID, $loanID, $dateReturned){
    $sql = "UPDATE loans SET returnedDate = ? WHERE copyID = ? AND loanID = ?";
    $stmt = $pdo->prepare($sql);
    $stmt->execute([$dateReturned, $copyID, $loanID]);

    $sql = "UPDATE copies SET isBorrowed=? WHERE copyID=?";
    $stmt = $pdo->prepare($sql);
    $stmt->execute([0, $copyID]);
}

/////////SELECT REQUEST/////////
function selectRequest($pdo, $selectRequest){
    $stmt = $pdo -> query("SELECT " . $selectRequest);

    $results = $stmt -> fetchAll(PDO::FETCH_ASSOC);

    foreach($results as $result){
        echo '<pre>'; print_r($result); echo '</pre>';
    }
}
?>