"""
app.py  –  FastAPI application for Scraping + Sentiment Analysis + WordCloud.
"""
from __future__ import annotations

import base64
import io
import csv
import json
import os
import traceback
from typing import Optional

import uvicorn
from fastapi import FastAPI, File, Form, Request, UploadFile
from fastapi.responses import HTMLResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates

from services.medos import scrape_medos
from services.tiktok import scrape_tiktok
from services.news import scrape_news
from services.preprocessing import preprocess_text
from services.sentiment import analyze_sentiment
from services.wordcloud_service import generate_wordcloud
from services.facebook import scrape_facebook

# ── App setup ──────────────────────────────────────────────────────────────────
app = FastAPI(title="Sentiment Analysis Dashboard")

app.mount("/static", StaticFiles(directory="static"), name="static")

templates = Jinja2Templates(directory="templates")


# ── Helpers ────────────────────────────────────────────────────────────────────

def _split_targets(raw: str | None) -> list[str]:
    """Split a newline/comma-separated string into a clean list of non-empty strings."""
    if not raw or not raw.strip():
        return []
    parts = []
    for line in raw.replace(",", "\n").splitlines():
        s = line.strip()
        if s:
            parts.append(s)
    return parts


def _is_enabled(flag: str | None) -> bool:
    """Return True only if the enable flag is explicitly '1'."""
    return (flag or "").strip() == "1"


def _flatten_for_csv(raw_texts: list) -> list[dict]:
    flat = []
    for item in raw_texts:
        if isinstance(item, str):
            flat.append({"text": item})
        elif isinstance(item, dict):
            base = {k: v for k, v in item.items() if k != "comments"}
            comments = item.get("comments", [])
            if not comments:
                flat.append(base)
            else:
                for c in comments:
                    row = dict(base)
                    if isinstance(c, str):
                        row["comment_text"] = c
                    elif isinstance(c, dict):
                        row["comment_author"] = c.get("author", "")
                        row["comment_text"] = c.get("comment", "")
                        flat.append(row)
                        for r in c.get("replies", []):
                            rep_row = dict(base)
                            rep_row["comment_author"] = r.get("author", "")
                            rep_row["comment_text"] = r.get("comment", "")
                            flat.append(rep_row)
                        continue
                    flat.append(row)
    return flat

def _extract_texts(raw_texts: list) -> list[str]:
    extracted = []
    for item in raw_texts:
        if isinstance(item, str):
            extracted.append(item)
        elif isinstance(item, dict):
            if "caption_short" in item: extracted.append(item["caption_short"])
            if "caption_detail" in item: extracted.append(item["caption_detail"])
            if "caption" in item: extracted.append(item["caption"])
            if "judul" in item: extracted.append(item["judul"])
            if "isi_berita" in item: extracted.append(item["isi_berita"])
            if "tag" in item: extracted.append(item["tag"])
            for c in item.get("comments", []):
                if isinstance(c, str):
                    extracted.append(c)
                elif isinstance(c, dict):
                    extracted.append(c.get("comment", ""))
                    for r in c.get("replies", []):
                        extracted.append(r.get("comment", ""))
    return extracted

def _run_pipeline(raw_texts: list) -> dict:
    """Shared preprocessing → sentiment → wordcloud pipeline."""
    if not raw_texts:
        return {
            "error": "Tidak ada teks yang berhasil dikumpulkan.",
            "result": None,
            "image": None,
            "total_scraped": 0,
            "csv_filename": None,
        }

    # Save CSV
    import os
    import csv
    from datetime import datetime
    os.makedirs("static/output", exist_ok=True)
    csv_fname = f"scraped_data_{datetime.now().strftime('%Y%m%d_%H%M%S')}.csv"
    csv_path = os.path.join("static", "output", csv_fname)
    
    flat_data = _flatten_for_csv(raw_texts)
    if flat_data:
        keys = set()
        for d in flat_data: keys.update(d.keys())
        with open(csv_path, "w", newline="", encoding="utf-8-sig") as f:
            writer = csv.DictWriter(f, fieldnames=list(keys))
            writer.writeheader()
            writer.writerows(flat_data)
        csv_url = f"/static/output/{csv_fname}"
    else:
        csv_url = None

    # Extract text for ML pipeline
    text_list = _extract_texts(raw_texts)
    
    total_scraped = len(text_list)
    print(f"[APP] Total item yg di-ekstrak teksnya: {total_scraped}")

    # Preprocess
    print("[APP] Preprocessing…")
    clean_texts = preprocess_text(text_list)
    clean_texts = [t for t in clean_texts if t and t.strip()]

    if not clean_texts:
        return {
            "error": "Semua teks kosong setelah preprocessing. Coba input yang berbeda.",
            "result": None,
            "image": None,
            "total_scraped": total_scraped,
            "csv_filename": csv_url,
        }

    # Sentiment
    print(f"[APP] Analyzing sentiment on {len(clean_texts)} texts…")
    try:
        sentiment = analyze_sentiment(clean_texts)
    except Exception as e:
        print(f"[APP] Sentiment error: {e}\n{traceback.format_exc()}")
        sentiment = None

    # WordCloud — generate into memory as base64 (no file saved)
    print("[APP] Generating wordcloud…")
    image_b64 = None
    try:
        buf = io.BytesIO()
        wc_ok = generate_wordcloud(clean_texts, buf)
        if wc_ok:
            buf.seek(0)
            image_b64 = base64.b64encode(buf.read()).decode("utf-8")
    except Exception as e:
        print(f"[APP] WordCloud error: {e}")

    return {
        "error": None,
        "result": sentiment,
        "image": image_b64,
        "total_scraped": total_scraped,
        "csv_filename": csv_url,
    }


# ── Routes ─────────────────────────────────────────────────────────────────────

@app.get("/", response_class=HTMLResponse)
async def home(request: Request):
    return templates.TemplateResponse(request=request, name="index.html")


@app.post("/process", response_class=HTMLResponse)
async def process(
    request: Request,

    # ── Platform enable flags (set by JS, "1" = enabled) ──────────────────
    enable_instagram: str = Form(""),
    enable_tiktok:    str = Form(""),
    enable_facebook:  str = Form(""),
    enable_news:      str = Form(""),

    # ── Instagram (separate credentials) ─────────────────────────────────
    ig_username:     str = Form(None),
    ig_password:     str = Form(None),
    target_accounts: str = Form(None),
    mode:            str = Form("all"),

    # ── TikTok ────────────────────────────────────────────────────────────
    tiktok_cookie:  str = Form(None),
    tiktok_targets: str = Form(None),

    # ── Facebook (separate credentials, explicit groups only) ─────────────
    fb_username:     str = Form(None),
    fb_password:     str = Form(None),
    facebook_groups: str = Form(None),

    # ── News ──────────────────────────────────────────────────────────────
    news_portals: str = Form(None),   # comma-separated portal keys
    news_keyword: str = Form("kabupaten cirebon"),
    news_pages:   int = Form(1),
):
    raw_texts: list = []

    # ── 1. Instagram ────────────────────────────────────────────────────────
    if _is_enabled(enable_instagram):
        ig_targets = _split_targets(target_accounts)
        if not ig_username or not ig_password:
            print("[APP] Instagram diaktifkan tapi username/password kosong — skip.")
        elif not ig_targets:
            print("[APP] Instagram diaktifkan tapi tidak ada target — skip.")
        else:
            for tgt in ig_targets:
                print(f"[APP] Scraping Instagram: {tgt}")
                try:
                    texts = scrape_medos(ig_username, ig_password, tgt, mode)
                    raw_texts.extend(texts)
                    print(f"[APP] Instagram @{tgt} → {len(texts)} teks")
                except Exception as e:
                    print(f"[APP] Instagram error ({tgt}): {e}")
    else:
        print("[APP] Instagram dinonaktifkan — skip.")

    # ── 2. TikTok ───────────────────────────────────────────────────────────
    if _is_enabled(enable_tiktok):
        tt_targets = _split_targets(tiktok_targets)
        if not tt_targets:
            print("[APP] TikTok diaktifkan tapi tidak ada target — skip.")
        else:
            for tgt in tt_targets:
                print(f"[APP] Scraping TikTok: {tgt}")
                try:
                    texts = scrape_tiktok(tiktok_cookie or "", tgt)
                    raw_texts.extend(texts)
                    print(f"[APP] TikTok @{tgt} → {len(texts)} teks")
                except Exception as e:
                    print(f"[APP] TikTok error ({tgt}): {e}")
    else:
        print("[APP] TikTok dinonaktifkan — skip.")

    # ── 3. Facebook ─────────────────────────────────────────────────────────
    # TIDAK memakai default groups — harus ada URL & credentials eksplisit
    if _is_enabled(enable_facebook):
        fb_groups = _split_targets(facebook_groups)
        if not fb_username or not fb_password:
            print("[APP] Facebook diaktifkan tapi username/password kosong — skip.")
        elif not fb_groups:
            print("[APP] Facebook diaktifkan tapi tidak ada URL grup — skip (tidak ada default).")
        else:
            print(f"[APP] Scraping Facebook {len(fb_groups)} grup…")
            try:
                texts = scrape_facebook(fb_username, fb_password, fb_groups)
                raw_texts.extend(texts)
                print(f"[APP] Facebook → {len(texts)} teks")
            except Exception as e:
                print(f"[APP] Facebook error: {e}")
    else:
        print("[APP] Facebook dinonaktifkan — skip.")

    # ── 4. News ─────────────────────────────────────────────────────────────
    if _is_enabled(enable_news):
        portals = _split_targets(news_portals)
        if not portals:
            print("[APP] News diaktifkan tapi tidak ada portal dipilih — skip.")
        else:
            for portal in portals:
                print(f"[APP] Scraping news: portal={portal}, keyword={news_keyword}, pages={news_pages}")
                try:
                    texts = scrape_news(portal, news_pages, keyword=news_keyword)
                    raw_texts.extend(texts)
                    print(f"[APP] News ({portal}) → {len(texts)} teks")
                except Exception as e:
                    print(f"[APP] News error ({portal}): {e}")
    else:
        print("[APP] News dinonaktifkan — skip.")

    # ── Pipeline ────────────────────────────────────────────────────────────
    outcome = _run_pipeline(raw_texts)

    return templates.TemplateResponse(
        request=request,
        name="index.html",
        context={
            "error": outcome["error"],
            "result": outcome["result"],
            "image": outcome["image"],
            "total_scraped": outcome["total_scraped"],
            "csv_filename": outcome["csv_filename"],
            "active_tab": "scraping",
        },
    )


@app.post("/wordcloud-dataset", response_class=HTMLResponse)
async def wordcloud_dataset(
    request: Request,
    dataset_text:  str        = Form(None),
    dataset_file:  UploadFile = File(None),
    text_column:   str        = Form("text"),
):
    """
    Word cloud + sentiment from an uploaded dataset (CSV/TXT/JSON) or pasted text.
    """
    raw_texts: list = []

    # Priority: file upload
    if dataset_file and dataset_file.filename:
        fname = dataset_file.filename.lower()
        content_bytes = await dataset_file.read()
        try:
            content_str = content_bytes.decode("utf-8", errors="replace")
        except Exception:
            content_str = content_bytes.decode("latin-1", errors="replace")

        if fname.endswith(".csv") or fname.endswith(".tsv"):
            delimiter = "\t" if fname.endswith(".tsv") else ","
            reader = csv.DictReader(io.StringIO(content_str), delimiter=delimiter)
            cols = reader.fieldnames or []
            for row in reader:
                if text_column and text_column in cols and row.get(text_column):
                    raw_texts.append(str(row[text_column]))
                else:
                    raw_texts.append(row)

        elif fname.endswith(".json"):
            try:
                data = json.loads(content_str)
                if isinstance(data, list):
                    for item in data:
                        if isinstance(item, str) and item:
                            raw_texts.append(item)
                        elif isinstance(item, dict):
                            if text_column and text_column in item and item.get(text_column):
                                raw_texts.append(str(item[text_column]))
                            else:
                                raw_texts.append(item)
            except Exception as e:
                print(f"[Dataset] JSON parse error: {e}")
        else:
            # Plain text — each non-empty line is one document
            for line in content_str.splitlines():
                line = line.strip()
                if line:
                    raw_texts.append(line)

    elif dataset_text and dataset_text.strip():
        for line in dataset_text.splitlines():
            line = line.strip()
            if line:
                raw_texts.append(line)

    if not raw_texts:
        return templates.TemplateResponse(
            request=request,
            name="index.html",
            context={
                "error": "Tidak ada teks ditemukan dalam dataset. Pastikan file / teks tidak kosong.",
                "result": None,
                "image": None,
                "total_scraped": 0,
                "csv_filename": None,
                "active_tab": "dataset",
            },
        )

    outcome = _run_pipeline(raw_texts)

    return templates.TemplateResponse(
        request=request,
        name="index.html",
        context={
            "error": outcome["error"],
            "result": outcome["result"],
            "image": outcome["image"],
            "total_scraped": outcome["total_scraped"],
            "csv_filename": outcome["csv_filename"],
            "active_tab": "dataset",
        },
    )


if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)