// Riaslink Port Builder — frontend logic.
// No framework, no build step: this is the entire client-side behavior for
// the build form, talking to the plain FastAPI routes in app.py.

(() => {
    'use strict';

    const form = document.getElementById('build-form');
    const buildBtn = document.getElementById('build-btn');
    const buildBtnLabel = buildBtn.querySelector('.build-btn-label');
    const statusPill = document.getElementById('status-pill');
    const logOutput = document.getElementById('log-output');
    const copyLogBtn = document.getElementById('copy-log-btn');
    const copyLogIcon = document.getElementById('copy-log-icon');
    const downloadArea = document.getElementById('download-area');
    const downloadLink = document.getElementById('download-link');

    const fileInput = document.getElementById('www_zip');
    const fileDrop = document.getElementById('file-drop');
    const fileDropLabel = document.getElementById('file-drop-label');
    const uploadRing = document.getElementById('upload-ring');
    const uploadRingProgress = document.getElementById('upload-ring-progress');
    const uploadRingLabel = document.getElementById('upload-ring-label');

    const accentColor = document.getElementById('accent_hex');
    const accentColorText = document.getElementById('accent_hex_text');

    // -------------------------------------------------------------------
    // File drop UX (native <input type="file"> still handles the actual
    // selection — this just adds drag-over styling and a filename label).
    // -------------------------------------------------------------------

    fileInput.addEventListener('change', () => {
        updateFileDropLabel();
    });

    ['dragenter', 'dragover'].forEach((evt) => {
        fileDrop.addEventListener(evt, (e) => {
            e.preventDefault();
            fileDrop.classList.add('drag-over');
        });
    });

    ['dragleave', 'drop'].forEach((evt) => {
        fileDrop.addEventListener(evt, (e) => {
            e.preventDefault();
            fileDrop.classList.remove('drag-over');
        });
    });

    fileDrop.addEventListener('drop', (e) => {
        const dropped = e.dataTransfer?.files;
        if (dropped && dropped.length > 0) {
            fileInput.files = dropped;
            updateFileDropLabel();
        }
    });

    function updateFileDropLabel() {
        const file = fileInput.files[0];
        if (file) {
            fileDropLabel.textContent = file.name;
            fileDropLabel.classList.add('has-file');
        } else {
            fileDropLabel.textContent = 'Dosya seç ya da buraya sürükle';
            fileDropLabel.classList.remove('has-file');
        }
    }

    // Matches the fixed stroke-dasharray in style.css (2 * pi * r, r=15.5).
    const CIRCLE_CIRCUMFERENCE = 97.389;

    function showUploadRing() {
        fileDrop.classList.add('uploading');
        uploadRing.classList.remove('hidden');
        setUploadProgress(0);
    }

    function hideUploadRing() {
        fileDrop.classList.remove('uploading');
        uploadRing.classList.add('hidden');
    }

    function setUploadProgress(fraction) {
        const clamped = Math.max(0, Math.min(1, fraction));
        const offset = CIRCLE_CIRCUMFERENCE * (1 - clamped);
        uploadRingProgress.style.strokeDashoffset = String(offset);
        uploadRingLabel.textContent = `${Math.round(clamped * 100)}%`;
    }

    // -------------------------------------------------------------------
    // Color picker <-> hex text field, kept in sync both directions.
    // -------------------------------------------------------------------

    accentColor.addEventListener('input', () => {
        accentColorText.value = accentColor.value;
    });

    accentColorText.addEventListener('input', () => {
        const value = accentColorText.value.trim();
        if (/^#[0-9a-fA-F]{6}$/.test(value)) {
            accentColor.value = value;
        }
    });

    // -------------------------------------------------------------------
    // Log rendering helpers
    // -------------------------------------------------------------------

    let logHasContent = false;

    function clearLog() {
        logOutput.innerHTML = '';
        logHasContent = false;
    }

    function appendLogLine(text, kind) {
        if (!logHasContent) {
            logOutput.innerHTML = '';
            logHasContent = true;
        }
        const line = document.createElement('div');
        if (kind) {
            line.className = `log-line-${kind}`;
        }
        line.textContent = text;
        logOutput.appendChild(line);
        logOutput.scrollTop = logOutput.scrollHeight;
    }

    function setStatus(state, label) {
        statusPill.dataset.state = state;
        statusPill.textContent = label;
    }

    function getLogText() {
        // Each log line is its own <div> (see appendLogLine) — reading
        // logOutput.textContent directly would run every line together
        // with no separator, so each line's own text is collected and
        // joined with real newlines instead.
        return Array.from(logOutput.children)
            .map((line) => line.textContent)
            .join('\n');
    }

    copyLogBtn.addEventListener('click', async () => {
        const text = getLogText();
        if (!text) return;

        try {
            if (navigator.clipboard && window.isSecureContext) {
                await navigator.clipboard.writeText(text);
            } else {
                // navigator.clipboard is only available in secure contexts
                // (HTTPS) — this covers plain-HTTP deployments with the
                // older document.execCommand approach instead.
                const textarea = document.createElement('textarea');
                textarea.value = text;
                textarea.style.position = 'fixed';
                textarea.style.opacity = '0';
                document.body.appendChild(textarea);
                textarea.select();
                document.execCommand('copy');
                document.body.removeChild(textarea);
            }
            showCopyFeedback(true);
        } catch (err) {
            showCopyFeedback(false);
        }
    });

    let copyFeedbackTimeout = null;

    function showCopyFeedback(success) {
        clearTimeout(copyFeedbackTimeout);
        copyLogBtn.classList.toggle('copied', success);
        copyLogIcon.textContent = success ? '✅' : '⚠️';
        copyLogBtn.title = success ? 'Kopyalandı' : 'Kopyalanamadı';

        copyFeedbackTimeout = setTimeout(() => {
            copyLogBtn.classList.remove('copied');
            copyLogIcon.textContent = '📋';
            copyLogBtn.title = 'Günlüğü kopyala';
        }, 1600);
    }

    // -------------------------------------------------------------------
    // Form submission
    // -------------------------------------------------------------------

    form.addEventListener('submit', async (e) => {
        e.preventDefault();

        if (!fileInput.files[0]) {
            appendLogLine('Önce bir www.zip dosyası seç.', 'error');
            return;
        }

        buildBtn.disabled = true;
        buildBtnLabel.textContent = 'Başlatılıyor...';
        downloadArea.classList.add('hidden');
        clearLog();
        setStatus('running', 'Çalışıyor');

        const formData = new FormData(form);
        // FormData already grabs www_zip from the <input type="file">, and
        // the checkbox only appears in FormData when checked — FastAPI's
        // Form(bool) parses "on"/"true"/"1" etc., but an absent field would
        // be missing entirely rather than "false", so it's added explicitly
        // here to always send a real value either way.
        formData.set('fps_default_visible', document.getElementById('fps_default_visible').checked ? 'true' : 'false');

        let buildId;
        try {
            const data = await uploadWithProgress('/api/build', formData);
            buildId = data.build_id;
        } catch (err) {
            appendLogLine(`Build başlatılamadı: ${err.message}`, 'error');
            setStatus('failed', 'Hata');
            hideUploadRing();
            resetButton();
            return;
        }

        hideUploadRing();
        buildBtnLabel.textContent = 'Build çalışıyor...';
        streamBuildLog(buildId);
    });

    // fetch() has no upload-progress event — only XMLHttpRequest exposes
    // xhr.upload.onprogress, which is what drives the circular ring below.
    // Wrapped in a Promise so the call site can stay a plain `await`.
    function uploadWithProgress(url, formData) {
        return new Promise((resolve, reject) => {
            const xhr = new XMLHttpRequest();
            xhr.open('POST', url);

            xhr.upload.onprogress = (event) => {
                if (event.lengthComputable) {
                    if (uploadRing.classList.contains('hidden')) {
                        showUploadRing();
                    }
                    setUploadProgress(event.loaded / event.total);
                }
            };

            xhr.onload = () => {
                if (xhr.status >= 200 && xhr.status < 300) {
                    try {
                        resolve(JSON.parse(xhr.responseText));
                    } catch (err) {
                        reject(new Error('Sunucu yanıtı okunamadı.'));
                    }
                } else {
                    reject(new Error(`Sunucu hatası (${xhr.status}): ${xhr.responseText}`));
                }
            };

            xhr.onerror = () => reject(new Error('Ağ hatası — yükleme başarısız oldu.'));

            xhr.send(formData);
        });
    }

    function resetButton() {
        buildBtn.disabled = false;
        buildBtnLabel.textContent = 'APK Oluştur';
    }

    // -------------------------------------------------------------------
    // Server-Sent Events: live log streaming from /api/build/{id}/stream
    // -------------------------------------------------------------------

    function streamBuildLog(buildId) {
        const source = new EventSource(`/api/build/${buildId}/stream`);

        source.onmessage = (event) => {
            let payload;
            try {
                payload = JSON.parse(event.data);
            } catch {
                return;
            }

            if (payload.type === 'log') {
                appendLogLine(payload.line);
            } else if (payload.type === 'error') {
                appendLogLine(payload.message, 'error');
                setStatus('failed', 'Hata');
                resetButton();
                source.close();
            } else if (payload.type === 'done') {
                source.close();
                resetButton();

                if (payload.status === 'success') {
                    setStatus('success', 'Tamamlandı');
                    appendLogLine('✅ Build tamamlandı.', 'success');
                    if (payload.download_url) {
                        downloadLink.href = payload.download_url;
                        downloadArea.classList.remove('hidden');
                    }
                } else {
                    setStatus('failed', 'Başarısız');
                    if (payload.error_message) {
                        appendLogLine(`❌ ${payload.error_message}`, 'error');
                    }
                }
            }
        };

        source.onerror = () => {
            // EventSource auto-retries on transient network errors, so this
            // only means something is actually wrong (server gone, build id
            // invalid) if the connection doesn't recover — close it and let
            // the person retry manually rather than retrying forever.
            source.close();
            if (statusPill.dataset.state === 'running') {
                appendLogLine('Bağlantı kesildi. Sayfayı yenileyip tekrar dene.', 'error');
                setStatus('failed', 'Bağlantı Hatası');
            }
            resetButton();
        };
    }
})();