import Crafter.CppDOM;
import std;
using namespace Crafter;
using namespace Crafter::CppDOMBindings;

// Structure to represent a note
struct Note {
    std::uint32_t id;
    std::string content;
};

void RenderNotes();

std::vector<Note> notes;
std::vector<HtmlElementView> noteButtons;

// Create the head section
HtmlElementPtr head("head", R"(
    <title>Note Taking App</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0 auto;
            background-color: #121212;
            color: #e0e0e0;
            width: 100vw;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .app-container {
            background-color: #1e1e1e;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.5);
            width: 50vw;
            max-width: 600px;
        }
        h1 {
            color: #ffffff;
            text-align: center;
        }
        .input-section {
            margin-bottom: 20px;
            padding: 15px;
            background-color: #2d2d2d;
            border-radius: 5px;
        }
        .input-section textarea {
            width: 100%;
            height: 80px;
            border: 1px solid #444;
            border-radius: 4px;
            resize: vertical;
            background-color: #333;
            color: #fff;
        }
        .input-section button {
            background-color: #4CAF50;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            margin-top: 10px;
        }
        .input-section button:hover {
            background-color: #45a049;
        }
        .notes-section h2 {
            color: #ffffff;
            border-bottom: 2px solid #4CAF50;
            padding-bottom: 5px;
        }
        .notes-list {
            margin-top: 15px;
        }
        .note-item {
            padding: 15px;
            margin-bottom: 10px;
            background-color: #2d2d2d;
            border-left: 4px solid #4CAF50;
            border-radius: 4px;
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
        }
        .note-content {
            flex-grow: 1;
            word-wrap: break-word;
            color: #e0e0e0;
        }
        .delete-btn {
            background-color: #f44336;
            color: white;
            border: none;
            padding: 5px 10px;
            border-radius: 3px;
            cursor: pointer;
            margin-left: 10px;
        }
        .delete-btn:hover {
            background-color: #da190b;
        }
        #error, #loading {
            padding: 10px;
            margin: 10px 0;
            border-radius: 4px;
        }
        #error {
            background-color: #780000;
            color: #ff9999;
            border: 1px solid #ff5555;
        }
        #loading {
            background-color: #003366;
            color: #99ccff;
            border: 1px solid #6699cc;
        }
    </style>
)");
    
// Create the body section
HtmlElementPtr body("body", R"(
    <div class="app-container">
        <h1>📝 Note Taking App</h1>
        
        <div class="input-section">
            <h2>Add New Note</h2>
            <textarea id="noteInput" placeholder="Enter your note here..."></textarea>
            <br>
            <button id="addNoteBtn">Add Note</button>
        </div>
        
        <div id="loading"></div>
        
        <div class="notes-section">
            <h2>Your Notes</h2>
            <div id="notesContainer"></div>
        </div>
    </div>
)");
HtmlElementPtr addNoteBtn("addNoteBtn");
HtmlElementPtr noteInput("noteInput");
HtmlElementPtr loadingIndicator("loading");
HtmlElementPtr notesContainer ("notesContainer");

void FetchNotes() {
    loadingIndicator.SetInnerHTML("<p>Loading notes...</p>");
    
    Fetch("http://localhost:3000/getNotes", [](std::string input) {
        notes.clear();
        std::istringstream stream(input);
        std::string line;

        while (std::getline(stream, line)) {
            // Skip empty lines
            if (line.empty()) continue;

            // First line is ID
            std::uint32_t id = std::stoi(line);

            // Read content until the next empty line
            std::string content;
            while (std::getline(stream, line) && !line.empty()) {
                if (!content.empty()) content += "\n";  // preserve line breaks
                content += line;
            }

            notes.push_back(Note{id, content});
        }
        
        loadingIndicator.SetInnerHTML("<p>Notes loaded!</p>");
        RenderNotes();
    });
}

// Function to delete a note via the backend
void DeleteNote(std::uint32_t id) {
    loadingIndicator.SetInnerHTML("<p>Deleting note...</p>");
    
    // Make POST request to delete note
    Fetch("http://localhost:3000/deleteNote", std::to_string(id), [](std::string content) {
        FetchNotes();
        loadingIndicator.SetInnerHTML("<p>Note deleted!</p>");
    });
}

// Function to render all notes to the DOM
void RenderNotes() {
    if (notes.empty()) {
        notesContainer.SetInnerHTML("<p>No notes yet. Add one below!</p>");
        return;
    }
    
    std::string html = "<div class='notes-list'>";
    noteButtons.clear();
    for (const Note& note : notes) {
        html += std::format(
            R"(<div class='note-item' id='note-{}'>
                <div class='note-content'>{}</div>
                <button id="note-{}-delete" class='delete-btn'>Delete</button>
            </div>)",
            note.id, note.content, note.id
        );
    }
    html += "</div>";
    
    notesContainer.SetInnerHTML(html);

    for (const Note& note : notes) {
        HtmlElementView& view = noteButtons.emplace_back(std::format("note-{}-delete",  note.id));
        view.AddClickListener([id = note.id](MouseEvent event) {
            DeleteNote(id);
        });
    }
}

// Main function
int main() {
    FetchNotes();
    
    // Add click listener to add note button
    addNoteBtn.AddClickListener([&](MouseEvent event) {
        std::string noteValue = noteInput.GetValue();
        std::cout << noteValue << std::endl;
        if (!noteValue.empty()) {
            loadingIndicator.SetInnerHTML("<p>Saving note...</p>");
            Fetch("http://localhost:3000/createNote", noteValue, [noteValue](std::string content) {
                std::cout << noteValue << std::endl;
                notes.push_back({static_cast<std::uint32_t>(std::stoi(content)), noteValue});
                noteInput.SetValue("");
                RenderNotes();
                loadingIndicator.SetInnerHTML("<p>Saved note!</p>");
            });
        }   
    });
}