// DOM elements
const dynamicDesc = document.getElementById("dynamicDesc");
const dynamicTitle = document.getElementById("dynamicTitle");

const singleModeBtn = document.getElementById('single-mode-btn');
const batchModeBtn = document.getElementById('batch-mode-btn');
const keywordModeBtn = document.getElementById("keyword-mode-btn");

const singleInput = document.querySelector('.single-input');
const batchInput = document.querySelector('.batch-input');
const keywordSearchInput = document.querySelector(".keyword-input");

const docIdInput = document.getElementById('doc-id');
const batchIdsInput = document.getElementById('batch-ids');
const keywordInput = document.getElementById("keywords");

const releaseFilter = document.querySelector("input[name=release]")
const modeFilter = document.querySelector("select[name=mode]")
const specTypeFilter = document.querySelector("select[name=spec_type]")
const workingGroupFilter = document.querySelector("select[name=working_group]")
const caseSensitiveFilter = document.querySelector("input[name=case_sensitive]")

const searchBtn = document.getElementById('search-btn');
const batchSearchBtn = document.getElementById('batch-search-btn');
const keywordSearchBtn = document.getElementById("keyword-search-btn");

const loader = document.getElementById('loader');
const resultsContainer = document.getElementById('results-container');
const resultsList = document.getElementById('results-list');
const resultsStats = document.getElementById('results-stats');
const errorMessage = document.getElementById('error-message');

// Search mode toggle
singleModeBtn.addEventListener('click', () => {
    dynamicTitle.textContent = "Find 3GPP Documents";
    dynamicDesc.textContent = "Enter a TSG document ID / specification ID (e.g., S1-123456, C2-987654 or 31.102) to locate the document in the 3GPP FTP server.";

    singleModeBtn.classList.add('active');
    keywordModeBtn.classList.remove("active");
    batchModeBtn.classList.remove('active');

    singleInput.style.display = 'block';
    batchInput.style.display = 'none';
    keywordSearchInput.style.display = "none";
});

batchModeBtn.addEventListener('click', () => {
    dynamicTitle.textContent = "Find multiple 3GPP Documents";
    dynamicDesc.textContent = "Enter a list of TSG document ID / specification ID (e.g., S1-123456, C2-987654 or 31.102) to locate all of the specified documents in the 3GPP FTP server.";

    batchModeBtn.classList.add('active');
    keywordModeBtn.classList.remove("active");
    singleModeBtn.classList.remove('active');

    batchInput.style.display = 'block';
    keywordSearchInput.style.display = "none";
    singleInput.style.display = 'none';
});

keywordModeBtn.addEventListener('click', () => {
    dynamicTitle.textContent = "Search 3GPP specifications";
    dynamicDesc.textContent = "With keywords and filters, find all of 3GPP's specifications that matches your needs (with keywords, specification number, release or even working group (C1, S5, SP, CP: always the first letter of the group followed by the workgroup number)";

    keywordModeBtn.classList.add("active");
    singleModeBtn.classList.remove('active');
    batchModeBtn.classList.remove("active");

    singleInput.style.display = "none";
    batchInput.style.display = "none";
    keywordSearchInput.style.display = "block";
})

document.getElementById('toggleFilters').onclick = function() {
  var target = document.getElementById('filtersForm');
  target.style.display = (target.style.display === 'none' || target.style.display === '') ? 'flex' : 'none';
};

keywordSearchBtn.addEventListener("click", async ()=>{
    const keywords = keywordInput.value.trim();
    if (!keywords) {
        showError("Please enter at least one keyword");
        return;
    }

    showLoader();
    hideError();

    try{
        const response = await fetch("/search-spec", {
            method: "POST",
            headers: {
                "Content-Type": "application/json"
            },
            body: JSON.stringify({
                keywords,
                "case_sensitive": caseSensitiveFilter.checked,
                "release": releaseFilter.value != '' ? releaseFilter.value : null,
                "mode": modeFilter.value,
                "working_group": workingGroupFilter != '' ? workingGroupFilter.value : null,
                "spec_type": specTypeFilter != "" ? specTypeFilter.value : null
            })
        });

        const data = await response.json();
        if (response.ok){
            displayKeywordResults(data);
        } else {
            showError('Error processing batch request');
        }
    } catch (error) {
        showError('Error connecting to the server. Please check if the API is running.');
        console.error('Error:', error);
    } finally {
        hideLoader();
    }
})


// Single document search
searchBtn.addEventListener('click', async () => {
    const docId = docIdInput.value.trim();
    if (!docId) {
        showError('Please enter a document ID');
        return;
    }

    showLoader();
    hideError();
    
    try {
        const response = await fetch(`/find`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ doc_id: docId, release: null })
        });

        const data = await response.json();
        
        if (response.ok) {
            displaySingleResult(data);
        } else {
            displaySingleNotFound(docId, data.detail);
        }
    } catch (error) {
        showError('Error connecting to the server. Please check if the API is running.');
        console.error('Error:', error);
    } finally {
        hideLoader();
    }
});

// Batch document search
batchSearchBtn.addEventListener('click', async () => {
    const batchText = batchIdsInput.value.trim();
    if (!batchText) {
        showError('Please enter at least one document ID');
        return;
    }

    const docIds = batchText.split('\n')
        .map(id => id.trim())
        .filter(id => id !== '');

    if (docIds.length === 0) {
        showError('Please enter at least one valid document ID');
        return;
    }

    showLoader();
    hideError();
    
    try {
        const response = await fetch(`/batch`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ doc_ids: docIds })
        });

        const data = await response.json();
        
        if (response.ok) {
            displayBatchResults(data);
        } else {
            showError('Error processing batch request');
        }
    } catch (error) {
        showError('Error connecting to the server. Please check if the API is running.');
        console.error('Error:', error);
    } finally {
        hideLoader();
    }
});

// Display single result
function displaySingleResult(data) {
    resultsList.innerHTML = '';
    
    const resultItem = document.createElement('div');
    resultItem.className = 'result-item';
    let scopeItem = data.scope ? `<p>Scope : ${data.scope}</p>` : ""
    resultItem.innerHTML = `
        <div class="result-header">
            <div class="result-id">${data.doc_id}</div>
            <div class="result-status status-found">Found</div>
        </div>
        <div class="result-url">
            <a href="${data.url}" target="_blank">${data.url}</a>
            ${scopeItem}
        </div>
    `;
    
    resultsList.appendChild(resultItem);
    resultsStats.textContent = `Found in ${data.search_time.toFixed(2)} seconds`;
    resultsContainer.style.display = 'block';
}

// Display single not found result
function displaySingleNotFound(docId, message) {
    resultsList.innerHTML = '';
    
    const resultItem = document.createElement('div');
    resultItem.className = 'result-item';
    resultItem.innerHTML = `
        <div class="result-header">
            <div class="result-id">${docId}</div>
            <div class="result-status status-not-found">Not Found</div>
        </div>
        <div>${message}</div>
    `;
    
    resultsList.appendChild(resultItem);
    resultsStats.textContent = 'Document not found';
    resultsContainer.style.display = 'block';
}

function displayKeywordResults(data) {
    resultsList.innerHTML = '';
    
    data.results.forEach(spec => {
        const resultItem = document.createElement("div");
        resultItem.className = "result-item"
        resultItem.innerHTML = `
            <div class="result-header">
                <div class="result-id">${spec.id}</div>
                <div class="result-status status-found">Found</div>
            </div>
            <div class="result-url">
                <p>Title: ${spec.title}</p>
                <p>Type: ${spec.type}</p>
                <p>Release: ${spec.release}</p>
                <p>Version: ${spec.version}</p>
                <p>WG: ${spec.working_group}</p>
                <p>URL: <a target="_blank" href="${spec.url}">${spec.url}</a></p>
                <p>Scope: ${spec.scope}</p>
            </div>
        `;
        resultsList.appendChild(resultItem);
    });
    resultsStats.textContent = `Found ${data.results.length} in ${data.search_time.toFixed(2)} seconds`
    resultsContainer.style.display = 'block';
}

// Display batch results
function displayBatchResults(data) {
    resultsList.innerHTML = '';
    
    // Found documents
    Object.entries(data.results).forEach(([docId, url]) => {
        const resultItem = document.createElement('div');
        resultItem.className = 'result-item';
        resultItem.innerHTML = `
            <div class="result-header">
                <div class="result-id">${docId}</div>
                <div class="result-status status-found">Found</div>
            </div>
            <div class="result-url">
                <a href="${url}" target="_blank">${url}</a>
            </div>
        `;
        resultsList.appendChild(resultItem);
    });
    
    // Not found documents
    data.missing.forEach(docId => {
        const resultItem = document.createElement('div');
        resultItem.className = 'result-item';
        resultItem.innerHTML = `
            <div class="result-header">
                <div class="result-id">${docId}</div>
                <div class="result-status status-not-found">Not Found</div>
            </div>
        `;
        resultsList.appendChild(resultItem);
    });
    
    const foundCount = Object.keys(data.results).length;
    const totalCount = foundCount + data.missing.length;
    
    resultsStats.textContent = `Found ${foundCount} of ${totalCount} documents in ${data.search_time.toFixed(2)} seconds`;
    resultsContainer.style.display = 'block';
}

// Show loader
function showLoader() {
    loader.style.display = 'block';
}

// Hide loader
function hideLoader() {
    loader.style.display = 'none';
}

// Show error message
function showError(message) {
    errorMessage.textContent = message;
    errorMessage.style.display = 'block';
}

// Hide error message
function hideError() {
    errorMessage.style.display = 'none';
}

// Enter key event for single search
docIdInput.addEventListener('keypress', (e) => {
    if (e.key === 'Enter') {
        searchBtn.click();
    }
});

keywordInput.addEventListener('keypress', (event)=>{
    if (event.key === "Enter"){
        keywordSearchBtn.click();
    }
})