<?php

/*
 * ITFlow - GET/POST request handler for AI Functions
 */

// TODO: Should this be moved to AJAX?

if (isset($_GET['ai_reword'])) {

    header('Content-Type: application/json');

    $sql = mysqli_query($mysqli, "SELECT * FROM ai_models LEFT JOIN ai_providers ON ai_model_ai_provider_id = ai_provider_id WHERE ai_model_use_case = 'General' LIMIT 1");

    $row = mysqli_fetch_array($sql);
    $model_name = $row['ai_model_name'];
    $promptText = $row['ai_model_prompt'];
    $url = $row['ai_provider_api_url'];
    $key = $row['ai_provider_api_key'];

    // Collecting the input data from the AJAX request.
    $inputJSON = file_get_contents('php://input');
    $input = json_decode($inputJSON, TRUE); // Convert JSON into array.

    $userText = $input['text'];

    // Preparing the data for the OpenAI Chat API request.
    $data = [
        "model" => "$model_name", // Specify the model
        "messages" => [
            ["role" => "system", "content" => $promptText],
            ["role" => "user", "content" => $userText],
        ],
        "temperature" => 0.5
    ];

    // Initialize cURL session to the OpenAI Chat API.
    $ch = curl_init("$url");

    // Set cURL options for the request.
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Content-Type: application/json',
        'Authorization: Bearer ' . $key,
    ]);

    // Execute the cURL session and capture the response.
    $response = curl_exec($ch);
    curl_close($ch);

    // Decode the JSON response.
    $responseData = json_decode($response, true);

    // Check if the response contains the expected data and return it.
    if (isset($responseData['choices'][0]['message']['content'])) {
        // Get the response content.
        $content = $responseData['choices'][0]['message']['content'];

        // Clean any leading "html" word or other unwanted text at the beginning.
        $content = preg_replace('/^html/i', '', $content);  // Remove any occurrence of 'html' at the start

        // Clean the response content to remove backticks or code block markers.
        $cleanedContent = str_replace('```', '', $content); // Remove backticks if they exist.

        // Trim any leading/trailing whitespace.
        $cleanedContent = trim($cleanedContent);

        // Return the cleaned response.
        echo json_encode(['rewordedText' => $cleanedContent]);
    } else {
        // Handle errors or unexpected response structure.
        echo json_encode(['rewordedText' => 'Failed to get a response from the AI API.']);
    }

}

if (isset($_GET['ai_ticket_summary'])) {

    header('Content-Type: text/html; charset=UTF-8');

    $sql = mysqli_query($mysqli, "SELECT * FROM ai_models LEFT JOIN ai_providers ON ai_model_ai_provider_id = ai_provider_id WHERE ai_model_use_case = 'General' LIMIT 1");

    $row = mysqli_fetch_array($sql);
    $model_name = $row['ai_model_name'];
    $url = $row['ai_provider_api_url'];
    $key = $row['ai_provider_api_key'];

    // Retrieve the ticket_id from POST
    $ticket_id = intval($_POST['ticket_id']);

    // Query the database for ticket details
    $sql = mysqli_query($mysqli, "
        SELECT ticket_subject, ticket_details, ticket_source, ticket_priority, ticket_status_name, category_name
        FROM tickets
        LEFT JOIN ticket_statuses ON ticket_status = ticket_status_id
        LEFT JOIN categories ON ticket_category = category_id
        WHERE ticket_id = $ticket_id
        LIMIT 1
    ");
    $row = mysqli_fetch_assoc($sql);
    $ticket_subject = $row['ticket_subject'];
    $ticket_details = strip_tags($row['ticket_details']); // strip HTML for cleaner prompt
    $ticket_status = $row['ticket_status_name'];
    $ticket_category = $row['category_name'];
    $ticket_source = $row['ticket_source'];
    $ticket_priority = $row['ticket_priority'];

    // Get ticket replies
    $sql_replies = mysqli_query($mysqli, "
        SELECT ticket_reply, ticket_reply_type, user_name
        FROM ticket_replies
        LEFT JOIN users ON ticket_reply_by = user_id
        WHERE ticket_reply_ticket_id = $ticket_id
        AND ticket_reply_archived_at IS NULL
        ORDER BY ticket_reply_id ASC
    ");

    $all_replies_text = "";
    while ($reply = mysqli_fetch_assoc($sql_replies)) {
        $reply_type = $reply['ticket_reply_type'];
        $reply_text = strip_tags($reply['ticket_reply']);
        $reply_by = $reply['user_name'];
        $all_replies_text .= "\nReply Type: $reply_type Reply By: $reply_by: Reply Text: $reply_text";
    }

    $prompt = "
    Summarize the following IT support ticket and its responses in a concise, clear, and professional manner. 
    The summary should include:

    1. Main Issue: What was the problem reported by the user?
    2. Actions Taken: What steps were taken to address the issue?
    3. Resolution or Next Steps: Was the issue resolved or is it ongoing?

    Please ensure:
    - If there are multiple issues, summarize each separately.
    - Urgency: If the ticket or replies express urgency or escalation, highlight it.
    - Attachments: If mentioned in the ticket, note any relevant attachments or files.
    - Avoid extra explanations or unnecessary information.

    Ticket Data:
    - Ticket Source: $ticket_source
    - Current Ticket Status: $ticket_status
    - Ticket Priority: $ticket_priority
    - Ticket Category: $ticket_category
    - Ticket Subject: $ticket_subject
    - Ticket Details: $ticket_details
    - Replies:
    $all_replies_text

    Formatting instructions:
    - Use valid HTML tags only.
    - Use <h3> for section headers (Main Issue, Actions Taken, Resolution).
    - Use <ul><li> for bullet points under each section.
    - Do NOT wrap the output in ```html or any other code fences.
    - Do NOT include <html>, <head>, or <body>.
    - Output only the summary content in pure HTML.
    If any part of the ticket or replies is unclear or ambiguous, mention it in the summary and suggest if further clarification is needed.
    ";

    // Prepare the POST data
    $post_data = [
        "model" => "$model_name",
        "messages" => [
            ["role" => "system", "content" => "Your task is to summarize IT support tickets with clear, concise details."],
            ["role" => "user", "content" => $prompt]
        ],
        "temperature" => 0.3
    ];

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Content-Type: application/json',
        'Authorization: Bearer ' . $key
    ]);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($post_data));

    $response = curl_exec($ch);
    if (curl_errno($ch)) {
        echo "Error: " . curl_error($ch);
        exit;
    }
    curl_close($ch);

    $response_data = json_decode($response, true);
    $summary = $response_data['choices'][0]['message']['content'] ?? "No summary available.";


    echo $summary; // nl2br to convert newlines to <br>, htmlspecialchars to prevent XSS
}

if (isset($_GET['ai_create_document_template'])) {
    // get_ai_document_template.php

    header('Content-Type: text/html; charset=UTF-8');

    $sql = mysqli_query($mysqli, "SELECT * FROM ai_models LEFT JOIN ai_providers ON ai_model_ai_provider_id = ai_provider_id WHERE ai_model_use_case = 'General' LIMIT 1");

    $row = mysqli_fetch_array($sql);
    $model_name = $row['ai_model_name'];
    $url = $row['ai_provider_api_url'];
    $key = $row['ai_provider_api_key'];

    $prompt = $_POST['prompt'] ?? '';

    // Basic validation
    if(empty($prompt)){
        echo "No prompt provided.";
        exit;
    }

    // Prepare prompt
    $system_message = "You are a helpful IT documentation assistant. You will create a well-structured HTML template for IT documentation based on a given prompt. Include headings, subheadings, bullet points, and possibly tables for clarity. No Lorem Ipsum, use realistic placeholders and professional language.";
    $user_message = "Create an HTML formatted IT documentation template based on the following request:\n\n\"$prompt\"\n\nThe template should be structured, professional, and useful for IT staff. Include relevant sections, instructions, prerequisites, and best practices.";

    $post_data = [
        "model" => "$model_name",
        "messages" => [
            ["role" => "system", "content" => $system_message],
            ["role" => "user", "content" => $user_message]
        ],
        "temperature" => 0.5
    ];

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Content-Type: application/json',
        'Authorization: Bearer ' . $key
    ]);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($post_data));

    $response = curl_exec($ch);
    if (curl_errno($ch)) {
        echo "Error: " . curl_error($ch);
        exit;
    }
    curl_close($ch);

    $response_data = json_decode($response, true);
    $template = $response_data['choices'][0]['message']['content'] ?? "<p>No content returned from AI.</p>";

    // Print the generated HTML template directly
    echo $template;
}