// Tab Navigation
document.querySelectorAll(".tab").forEach(tab => {
    tab.addEventListener("click", () => {
        document.querySelectorAll(".tab").forEach(t => t.classList.remove("active"));
        document.querySelectorAll(".tab-content").forEach(c => c.classList.remove("active"));
        tab.classList.add("active");
        document.getElementById(tab.dataset.tab).classList.add("active");
    });
});

// Upload Zone Setup
function setupUploadZone(zoneId, inputId, infoId, btnId) {
    const zone = document.getElementById(zoneId);
    const input = document.getElementById(inputId);
    const info = document.getElementById(infoId);
    const btn = document.getElementById(btnId);
    
    zone.addEventListener("click", () => input.click());
    zone.addEventListener("dragover", (e) => { e.preventDefault(); zone.classList.add("dragover"); });
    zone.addEventListener("dragleave", () => zone.classList.remove("dragover"));
    zone.addEventListener("drop", (e) => {
        e.preventDefault();
        zone.classList.remove("dragover");
        if (e.dataTransfer.files.length) {
            input.files = e.dataTransfer.files;
            updateFileInfo(input, info, btn);
        }
    });
    input.addEventListener("change", () => updateFileInfo(input, info, btn));
}

function updateFileInfo(input, info, btn) {
    if (input.files.length) {
        const file = input.files[0];
        info.innerHTML = `<strong>✓ ${file.name}</strong> (${(file.size / 1024).toFixed(1)} KB)`;
        info.classList.add("visible");
        btn.disabled = false;
    }
}

function showStatus(id, type, message) {
    const status = document.getElementById(id);
    status.className = `status visible ${type}`;
    status.textContent = message;
}

// Setup all upload zones
setupUploadZone("laufzettel-zone", "laufzettel-input", "laufzettel-info", "generate-btn");
setupUploadZone("pdf-zone", "pdf-input", "pdf-info", "analyze-btn");
setupUploadZone("vorbericht-zone", "vorbericht-input", "vorbericht-info", "vorbericht-btn");

// API Base URL
const API_BASE = "/schadenprotokoll/api";

// Generate Button
document.getElementById("generate-btn").addEventListener("click", async () => {
    showStatus("generate-status", "loading", "⏳ Verarbeite Laufzettel...");
    
    const file = document.getElementById("laufzettel-input").files[0];
    const formData = new FormData();
    formData.append("file", file);
    
    try {
        const response = await fetch(`${API_BASE}/generate`, {
            method: "POST",
            body: formData
        });
        
        if (\!response.ok) {
            const err = await response.json();
            throw new Error(err.error || "Unbekannter Fehler");
        }
        
        const blob = await response.blob();
        const url = URL.createObjectURL(blob);
        const a = document.createElement("a");
        a.href = url;
        a.download = "Schadenprotokoll_vorbefuellt.pdf";
        a.click();
        URL.revokeObjectURL(url);
        
        showStatus("generate-status", "success", "✓ PDF erfolgreich generiert und heruntergeladen");
    } catch (err) {
        showStatus("generate-status", "error", `❌ Fehler: ${err.message}`);
    }
});

// Analyze Button
document.getElementById("analyze-btn").addEventListener("click", async () => {
    showStatus("analyze-status", "loading", "⏳ Analysiere PDF...");
    
    const file = document.getElementById("pdf-input").files[0];
    const formData = new FormData();
    formData.append("file", file);
    
    try {
        const response = await fetch(`${API_BASE}/analyze`, {
            method: "POST",
            body: formData
        });
        
        if (\!response.ok) {
            const err = await response.json();
            throw new Error(err.error || "Unbekannter Fehler");
        }
        
        const result = await response.json();
        displayAnalysisResult(result.data);
        showStatus("analyze-status", "success", "✓ Analyse abgeschlossen");
    } catch (err) {
        showStatus("analyze-status", "error", `❌ Fehler: ${err.message}`);
    }
});

function displayAnalysisResult(data) {
    const container = document.getElementById("analyze-data");
    let html = "";
    
    // Textfelder
    if (Object.keys(data.textfields).length > 0) {
        html += `<div class="field-group"><h5>Textfelder</h5><div class="field-list">`;
        for (const [key, value] of Object.entries(data.textfields)) {
            if (value) html += `<div class="dropdown-item"><strong>${key}:</strong> ${value}</div>`;
        }
        html += `</div></div>`;
    }
    
    // Dropdowns
    if (Object.keys(data.dropdowns).length > 0) {
        html += `<div class="field-group"><h5>Dropdown-Auswahlen (Sachverhalt)</h5><div class="field-list">`;
        for (const [key, val] of Object.entries(data.dropdowns)) {
            if (val.selected) {
                html += `<div class="dropdown-item"><strong>${key}:</strong> ${val.selected}</div>`;
            }
        }
        html += `</div></div>`;
    }
    
    container.innerHTML = html || "<p>Keine ausgefüllten Felder gefunden.</p>";
    document.getElementById("analyze-result").classList.add("visible");
}

// Vorbericht Button
document.getElementById("vorbericht-btn").addEventListener("click", async () => {
    showStatus("vorbericht-status", "loading", "⏳ Erstelle Vorbericht...");
    
    const file = document.getElementById("vorbericht-input").files[0];
    const formData = new FormData();
    formData.append("file", file);
    
    try {
        const response = await fetch(`${API_BASE}/vorbericht`, {
            method: "POST",
            body: formData
        });
        
        if (\!response.ok) {
            const err = await response.json();
            throw new Error(err.error || "Unbekannter Fehler");
        }
        
        const blob = await response.blob();
        const url = URL.createObjectURL(blob);
        const a = document.createElement("a");
        a.href = url;
        a.download = "Vorbericht.docx";
        a.click();
        URL.revokeObjectURL(url);
        
        showStatus("vorbericht-status", "success", "✓ Vorbericht erfolgreich erstellt und heruntergeladen");
    } catch (err) {
        showStatus("vorbericht-status", "error", `❌ Fehler: ${err.message}`);
    }
});

// Admin Tab - Templates laden
async function loadTemplates() {
    try {
        const response = await fetch(`${API_BASE}/templates`);
        const data = await response.json();
        const container = document.getElementById("templates-container");
        
        if (data.templates.length === 0) {
            container.innerHTML = "<p>Keine Templates vorhanden.</p>";
            return;
        }
        
        container.innerHTML = data.templates.map(t => `
            <div class="template-item">
                <span class="name">${t.type === "pdf" ? "📄" : "📝"} ${t.name}</span>
                <span class="size">${(t.size / 1024).toFixed(1)} KB</span>
            </div>
        `).join("");
    } catch (err) {
        document.getElementById("templates-container").innerHTML = 
            `<p style="color:red;">Fehler: ${err.message}</p>`;
    }
}

// Template Upload
function setupTemplateUpload(zoneId, inputId, templateType) {
    const zone = document.getElementById(zoneId);
    const input = document.getElementById(inputId);
    
    zone.addEventListener("click", () => input.click());
    zone.addEventListener("dragover", (e) => { e.preventDefault(); zone.classList.add("dragover"); });
    zone.addEventListener("dragleave", () => zone.classList.remove("dragover"));
    zone.addEventListener("drop", (e) => {
        e.preventDefault();
        zone.classList.remove("dragover");
        if (e.dataTransfer.files.length) {
            input.files = e.dataTransfer.files;
            uploadTemplate(input.files[0], templateType);
        }
    });
    input.addEventListener("change", () => {
        if (input.files.length) uploadTemplate(input.files[0], templateType);
    });
}

async function uploadTemplate(file, type) {
    showStatus("admin-status", "loading", `⏳ Lade ${type.toUpperCase()} Template hoch...`);
    
    const formData = new FormData();
    formData.append("file", file);
    formData.append("type", type);
    
    try {
        const response = await fetch(`${API_BASE}/templates/upload`, {
            method: "POST",
            body: formData
        });
        
        if (!response.ok) {
            const err = await response.json();
            throw new Error(err.error);
        }
        
        showStatus("admin-status", "success", "✓ Template erfolgreich hochgeladen");
        loadTemplates();
    } catch (err) {
        showStatus("admin-status", "error", `❌ Fehler: ${err.message}`);
    }
}

setupTemplateUpload("pdf-template-zone", "pdf-template-input", "pdf");
setupTemplateUpload("docx-template-zone", "docx-template-input", "docx");

// Templates beim Tab-Wechsel laden
document.querySelector([data-tab=admin]).addEventListener("click", loadTemplates);