"""
ResearchOwl Telegram Bot
Main user interface — all commands handled here
"""
import asyncio
import os
from datetime import datetime
from typing import Optional

import structlog
from telegram import Update, Message
from telegram.ext import (
    Application, CommandHandler, MessageHandler,
    filters, ContextTypes
)
from telegram.constants import ParseMode

from src.config import settings
from src.db.database import get_db, ResearchDB, ResearchStatus, OutputType
from src.scraper.exhaustive import ExhaustiveScraper
from src.processor.processor import OllamaClient, ContentProcessor
from src.generator.generator import OutputGenerator

logger = structlog.get_logger()

# Active research tasks per chat
_active_tasks: dict[int, asyncio.Task] = {}
_active_sessions: dict[int, int] = {}  # chat_id -> session_id


def is_authorized(user_id: int) -> bool:
    allowed = settings.allowed_user_ids
    return not allowed or user_id in allowed


def fmt_progress(iteration: int, total: int, new: int, stats: dict) -> str:
    scraped = stats.get("scraped", 0)
    failed = stats.get("failed", 0)
    pending = stats.get("pending", 0)
    return (
        f"🔄 *Iteration {iteration}*\n"
        f"📚 Sources found: `{total}`\n"
        f"✅ Scraped: `{scraped}` | ❌ Failed: `{failed}` | ⏳ Pending: `{pending}`\n"
        f"🆕 New this round: `{new}`"
    )


async def send_chunked(message: Message, text: str, parse_mode=None):
    """Send long text in chunks of 4000 chars (Telegram limit)"""
    max_len = 4000
    for i in range(0, len(text), max_len):
        chunk = text[i:i + max_len]
        await message.reply_text(chunk, parse_mode=parse_mode)
        if len(text) > max_len:
            await asyncio.sleep(0.5)


# ─── Commands ─────────────────────────────────────────────────────────────────

async def cmd_start(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return
    await update.message.reply_text(
        "🦉 *ResearchOwl* — Exhaustive Research Engine\n\n"
        "Commands:\n"
        "`/research <topic>` — Start exhaustive research\n"
        "`/status` — Check current research progress\n"
        "`/finish` — Stop research and proceed to generation\n"
        "`/process` — Manually trigger chunk processing\n"
        "`/generate <type>` — Generate output (podcast|blog|report|thread)\n"
        "`/sources` — List all sources found\n"
        "`/outputs` — List generated outputs\n"
        "`/cancel` — Cancel current research\n"
        "`/help` — Show this message",
        parse_mode=ParseMode.MARKDOWN
    )


async def cmd_research(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    topic = " ".join(ctx.args).strip() if ctx.args else ""

    if not topic:
        await update.message.reply_text(
            "❌ Please provide a topic.\nExample: `/research Roswell incident`",
            parse_mode=ParseMode.MARKDOWN
        )
        return

    # Check for existing active research
    if chat_id in _active_tasks and not _active_tasks[chat_id].done():
        await update.message.reply_text(
            "⚠️ Research already in progress. Use /status or /finish first."
        )
        return

    msg = await update.message.reply_text(
        f"🦉 *ResearchOwl* starting research on:\n`{topic}`\n\n"
        f"🌱 Seeding sources from:\n"
        f"• DuckDuckGo (8 queries)\n"
        f"• Wikipedia + internal links\n"
        f"• Reddit top posts\n"
        f"• YouTube transcripts\n\n"
        f"This will run exhaustively until saturation. Use /finish to stop early.",
        parse_mode=ParseMode.MARKDOWN
    )

    async def run_research():
        db_conn = await get_db()
        db = ResearchDB(db_conn)
        try:
            session_id = await db.create_session(topic, chat_id)
            _active_sessions[chat_id] = session_id

            progress_msg = msg
            iteration_count = [0]

            async def on_progress(iteration, total, new_this_round, stats):
                iteration_count[0] = iteration
                text = fmt_progress(iteration, total, new_this_round, stats)
                try:
                    await progress_msg.edit_text(text, parse_mode=ParseMode.MARKDOWN)
                except Exception:
                    pass

            scraper = ExhaustiveScraper(db, session_id, topic, on_progress)
            final_stats = await scraper.run()

            await db.update_session(session_id, status=ResearchStatus.SATURATED)

            scraped = final_stats.get("scraped", 0)
            await update.message.reply_text(
                f"✅ *Research complete!*\n\n"
                f"📊 Results:\n"
                f"• Sources found & scraped: `{scraped}`\n"
                f"• Iterations: `{iteration_count[0]}`\n\n"
                f"Now processing content with Ollama...\n"
                f"Use `/generate podcast|blog|report|thread` when ready.",
                parse_mode=ParseMode.MARKDOWN
            )

            # Auto-process after scraping
            ollama = OllamaClient()
            if await ollama.is_available():
                processor = ContentProcessor(db, ollama)

                async def proc_progress(total_chunks, total_words):
                    await update.message.reply_text(
                        f"🧠 *Processing complete!*\n"
                        f"• Chunks stored: `{total_chunks}`\n"
                        f"• Words researched: `{total_words:,}`\n\n"
                        f"Ready! Use `/generate podcast|blog|report|thread`",
                        parse_mode=ParseMode.MARKDOWN
                    )

                await processor.process_session(session_id, topic, proc_progress)
            else:
                await update.message.reply_text(
                    "⚠️ Ollama not reachable — skipping processing.\n"
                    "You can still use `/generate` (will use raw content)."
                )

        except asyncio.CancelledError:
            await db.update_session(
                _active_sessions.get(chat_id, 0),
                status=ResearchStatus.FINISHED
            )
            await update.message.reply_text("🛑 Research cancelled.")
        except Exception as e:
            logger.error("Research task failed", error=str(e))
            await update.message.reply_text(f"❌ Research failed: {str(e)[:200]}")
        finally:
            await db_conn.close()

    task = asyncio.create_task(run_research())
    _active_tasks[chat_id] = task


async def cmd_status(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    db_conn = await get_db()
    db = ResearchDB(db_conn)

    try:
        session = await db.get_active_session(chat_id)
        if not session:
            # Try to find last session
            cursor = await db_conn.execute(
                "SELECT * FROM research_sessions WHERE telegram_chat_id = ? ORDER BY created_at DESC LIMIT 1",
                (chat_id,)
            )
            row = await cursor.fetchone()
            session = dict(row) if row else None

        if not session:
            await update.message.reply_text("No research sessions found. Start with /research <topic>")
            return

        stats = await db.get_session_stats(session["id"])
        is_active = chat_id in _active_tasks and not _active_tasks[chat_id].done()

        status_emoji = {"running": "🔄", "saturated": "✅", "finished": "🏁", "error": "❌"}
        emoji = status_emoji.get(session["status"], "❓")

        await update.message.reply_text(
            f"{emoji} *Research Status*\n\n"
            f"📝 Topic: `{session['topic']}`\n"
            f"🔁 Status: `{session['status']}`\n"
            f"🔢 Iterations: `{session.get('iterations', 0)}`\n"
            f"📚 Total sources: `{stats.get('total', 0)}`\n"
            f"✅ Scraped: `{stats.get('scraped', 0)}`\n"
            f"❌ Failed: `{stats.get('failed', 0)}`\n"
            f"⏳ Pending: `{stats.get('pending', 0)}`\n"
            f"💬 Chunks: `{session.get('total_chunks', 0)}`\n"
            f"📖 Words: `{session.get('total_words', 0):,}`\n"
            f"{'🟢 Active' if is_active else '⚫ Idle'}",
            parse_mode=ParseMode.MARKDOWN
        )
    finally:
        await db_conn.close()


async def cmd_finish(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    task = _active_tasks.get(chat_id)

    if task and not task.done():
        task.cancel()
        await update.message.reply_text(
            "🛑 Stopping research...\n"
            "Use `/generate podcast|blog|report|thread` to generate output.",
            parse_mode=ParseMode.MARKDOWN
        )
    else:
        await update.message.reply_text(
            "No active research. Use `/generate` to create output from last session.",
            parse_mode=ParseMode.MARKDOWN
        )


async def cmd_generate(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    output_arg = ctx.args[0].lower() if ctx.args else ""

    type_map = {
        "podcast": OutputType.PODCAST,
        "blog": OutputType.BLOG,
        "report": OutputType.REPORT,
        "thread": OutputType.THREAD,
        "hilo": OutputType.THREAD,
        "informe": OutputType.REPORT,
    }

    if output_arg not in type_map:
        await update.message.reply_text(
            "❌ Invalid output type.\n"
            "Use: `/generate podcast|blog|report|thread`",
            parse_mode=ParseMode.MARKDOWN
        )
        return

    output_type = type_map[output_arg]

    db_conn = await get_db()
    db = ResearchDB(db_conn)

    try:
        # Find last session for this chat
        cursor = await db_conn.execute(
            """SELECT * FROM research_sessions WHERE telegram_chat_id = ?
               ORDER BY created_at DESC LIMIT 1""",
            (chat_id,)
        )
        row = await cursor.fetchone()
        if not row:
            await update.message.reply_text("No research sessions found. Start with /research <topic>")
            return

        session = dict(row)
        session_id = session["id"]

        msg = await update.message.reply_text(
            f"⚙️ Generating *{output_type}* for: `{session['topic']}`\n"
            f"Using Ollama ({settings.ollama_model})...\n"
            f"This may take 2-5 minutes ☕",
            parse_mode=ParseMode.MARKDOWN
        )

        async def gen_progress(text):
            try:
                await msg.edit_text(text)
            except Exception:
                pass

        ollama = OllamaClient()
        processor = ContentProcessor(db, ollama)
        generator = OutputGenerator(db, ollama, processor)

        output = await generator.generate(session_id, output_type, gen_progress)

        # Send as file if very long
        if len(output) > 8000:
            import tempfile
            ext_map = {
                OutputType.PODCAST: "script.md",
                OutputType.BLOG: "post.md",
                OutputType.REPORT: "report.md",
                OutputType.THREAD: "thread.txt",
            }
            filename = f"researchowl_{session['topic'][:30].replace(' ', '_')}_{ext_map[output_type]}"

            with tempfile.NamedTemporaryFile(mode="w", suffix=".md", delete=False) as f:
                f.write(output)
                tmp_path = f.name

            with open(tmp_path, "rb") as f:
                await update.message.reply_document(
                    document=f,
                    filename=filename,
                    caption=f"📄 *{output_type.upper()}* — {session['topic']}\n"
                             f"Generated by ResearchOwl 🦉",
                    parse_mode=ParseMode.MARKDOWN
                )
            os.unlink(tmp_path)
        else:
            await send_chunked(update.message, output)

    except Exception as e:
        logger.error("Generate failed", error=str(e))
        await update.message.reply_text(f"❌ Generation failed: {str(e)[:200]}")
    finally:
        await db_conn.close()


async def cmd_sources(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    db_conn = await get_db()
    db = ResearchDB(db_conn)

    try:
        cursor = await db_conn.execute(
            "SELECT * FROM research_sessions WHERE telegram_chat_id = ? ORDER BY created_at DESC LIMIT 1",
            (chat_id,)
        )
        row = await cursor.fetchone()
        if not row:
            await update.message.reply_text("No sessions found.")
            return

        session_id = row["id"]
        sources = await db.get_all_sources(session_id)

        by_type: dict = {}
        for s in sources:
            t = s["source_type"]
            by_type.setdefault(t, []).append(s)

        lines = [f"📚 *Sources for session #{session_id}*\n"]
        for stype, srcs in by_type.items():
            scraped = sum(1 for s in srcs if s["status"] == "scraped")
            lines.append(f"\n*{stype.upper()}* ({scraped}/{len(srcs)} scraped)")
            for s in srcs[:5]:  # show top 5 per type
                quality = s.get("quality_score", 0)
                status_icon = {"scraped": "✅", "failed": "❌", "pending": "⏳", "skipped": "⏭️"}.get(s["status"], "❓")
                title = (s.get("title") or s["url"])[:50]
                lines.append(f"{status_icon} {title} (q:{quality:.1f})")
            if len(srcs) > 5:
                lines.append(f"  ... and {len(srcs)-5} more")

        await send_chunked(update.message, "\n".join(lines), parse_mode=ParseMode.MARKDOWN)
    finally:
        await db_conn.close()


async def cmd_outputs(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    db_conn = await get_db()
    db = ResearchDB(db_conn)

    try:
        cursor = await db_conn.execute(
            "SELECT * FROM research_sessions WHERE telegram_chat_id = ? ORDER BY created_at DESC LIMIT 1",
            (chat_id,)
        )
        row = await cursor.fetchone()
        if not row:
            await update.message.reply_text("No sessions found.")
            return

        outputs = await db.get_outputs(row["id"])
        if not outputs:
            await update.message.reply_text(
                "No outputs generated yet. Use `/generate podcast|blog|report|thread`",
                parse_mode=ParseMode.MARKDOWN
            )
            return

        lines = [f"📄 *Outputs for: {row['topic']}*\n"]
        for o in outputs:
            from datetime import datetime
            dt = datetime.utcfromtimestamp(o['created_at']).strftime("%Y-%m-%d %H:%M")
            lines.append(f"• `{o['output_type']}` — {dt} ({len(o['content'])} chars)")

        await update.message.reply_text(
            "\n".join(lines),
            parse_mode=ParseMode.MARKDOWN
        )
    finally:
        await db_conn.close()


async def cmd_process(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    db_conn = await get_db()
    db = ResearchDB(db_conn)

    try:
        cursor = await db_conn.execute(
            "SELECT * FROM research_sessions WHERE telegram_chat_id = ? ORDER BY created_at DESC LIMIT 1",
            (chat_id,)
        )
        row = await cursor.fetchone()
        if not row:
            await update.message.reply_text("No research sessions found. Start with /research <topic>")
            return

        session = dict(row)
        session_id = session["id"]
        topic = session["topic"]

        msg = await update.message.reply_text(
            f"🧠 Processing session #{session_id}: `{topic}`\n"
            f"Chunking & scoring with Ollama ({settings.ollama_model})...\n"
            f"This may take a few minutes.",
            parse_mode=ParseMode.MARKDOWN
        )

        ollama = OllamaClient()
        if not await ollama.is_available():
            await msg.edit_text("❌ Ollama not reachable. Check OLLAMA_URL setting.")
            return

        processor = ContentProcessor(db, ollama)

        async def proc_progress(total_chunks, total_words):
            try:
                await msg.edit_text(
                    f"🧠 *Processing complete!*\n"
                    f"• Chunks stored: `{total_chunks}`\n"
                    f"• Words researched: `{total_words:,}`\n\n"
                    f"Ready! Use `/generate podcast|blog|report|thread`\n"
                    f"_If 0 chunks: set `QUALITY_THRESHOLD=0.3` or `0` and retry_",
                    parse_mode=ParseMode.MARKDOWN
                )
            except Exception:
                pass

        await processor.process_session(session_id, topic, proc_progress)

    except Exception as e:
        logger.error("Process command failed", error=str(e))
        await update.message.reply_text(f"❌ Processing failed: {str(e)[:200]}")
    finally:
        await db_conn.close()


async def cmd_cancel(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    if not is_authorized(update.effective_user.id):
        return

    chat_id = update.effective_chat.id
    task = _active_tasks.get(chat_id)
    if task and not task.done():
        task.cancel()
        await update.message.reply_text("🛑 Research cancelled.")
    else:
        await update.message.reply_text("No active research to cancel.")


async def cmd_help(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
    await cmd_start(update, ctx)


# ─── Bot setup ────────────────────────────────────────────────────────────────

def create_bot() -> Application:
    app = Application.builder().token(settings.telegram_bot_token).build()

    app.add_handler(CommandHandler("start", cmd_start))
    app.add_handler(CommandHandler("help", cmd_help))
    app.add_handler(CommandHandler("research", cmd_research))
    app.add_handler(CommandHandler("status", cmd_status))
    app.add_handler(CommandHandler("finish", cmd_finish))
    app.add_handler(CommandHandler("generate", cmd_generate))
    app.add_handler(CommandHandler("sources", cmd_sources))
    app.add_handler(CommandHandler("outputs", cmd_outputs))
    app.add_handler(CommandHandler("process", cmd_process))
    app.add_handler(CommandHandler("cancel", cmd_cancel))

    return app


def run():
    logger.info("Starting ResearchOwl bot")
    app = create_bot()
    app.run_polling(allowed_updates=Update.ALL_TYPES)