"""FlowDeck — My Tasks router (v1.9.0)."""
from __future__ import annotations

import json
import logging

from fastapi import APIRouter, Request, HTTPException, Query
from fastapi.responses import HTMLResponse

from app.db import get_conn
from app.auth.session import SessionManager

logger = logging.getLogger(__name__)
router = APIRouter(tags=["my-tasks"], prefix="/my-tasks")


def _get_current_user(request: Request) -> dict | None:
    session = request.cookies.get("flowdeck_session", "")
    return SessionManager.decode_session(session)


@router.get("", response_class=HTMLResponse)
async def my_tasks_dashboard(request: Request, view: str = "all", days: int = 7):
    """My Tasks — aggregates all pages assigned to the current user across all collections."""
    user = _get_current_user(request)
    user_login = user.get("login", "admin") if user else "admin"

    with get_conn() as conn:
        collections = conn.execute("SELECT * FROM collections ORDER BY name").fetchall()
        grouped: dict[str, list[dict]] = {}

        for col in collections:
            col_id = col["id"]
            pages = conn.execute(
                "SELECT * FROM collection_pages WHERE collection_id=? AND parent_id IS NULL ORDER BY position",
                (col_id,),
            ).fetchall()

            collection_tasks = []
            for p in pages:
                props = json.loads(p["property_values_json"])
                # Check if assigned to current user
                assigned = False
                for v in props.values():
                    if isinstance(v, list):
                        for item in v:
                            if isinstance(item, dict) and item.get("login") == user_login:
                                assigned = True
                                break
                    elif isinstance(v, str) and user_login.lower() in v.lower():
                        assigned = True
                    if assigned:
                        break

                if not assigned and user_login == "admin":
                    assigned = True  # admin sees all

                if not assigned:
                    continue

                # Extract status and due date
                status = None
                due_date = None
                for v in props.values():
                    if isinstance(v, str) and v in ("Todo", "In Progress", "Done", "Complete"):
                        status = v
                    elif isinstance(v, str) and v.startswith("20"):
                        due_date = v[:10]

                # Filter by view
                if view == "today":
                    from datetime import date
                    if not due_date or due_date != date.today().isoformat():
                        continue
                elif view == "overdue":
                    from datetime import date
                    if not due_date or due_date >= date.today().isoformat():
                        continue
                elif view == "upcoming":
                    from datetime import date, timedelta
                    if not due_date:
                        continue
                    today = date.today()
                    limit = today + timedelta(days=days)
                    d = date.fromisoformat(due_date)
                    if d < today or d > limit:
                        continue

                collection_tasks.append({
                    "id": p["id"], "title": p["title"], "icon": p.get("icon", "📄"),
                    "status": status, "due_date": due_date, "props": props,
                })

            if collection_tasks:
                grouped[col["name"]] = collection_tasks

    total = sum(len(t) for t in grouped.values())

    # Render
    sections = ""
    for col_name, tasks in grouped.items():
        items = ""
        for t in tasks:
            due_badge = f"<span class='mt-due'>{t['due_date']}</span>" if t.get("due_date") else ""
            status_badge = f"<span class='mt-status mt-{t['status'].lower().replace(' ','-') if t.get('status') else 'none'}'>{t.get('status','—')}</span>"
            items += f"""<div class='mt-item'>
<span class='mt-icon'>{t['icon']}</span>
<span class='mt-title'>{t['title']}</span>
{status_badge}{due_badge}
</div>"""

        sections += f"""<div class='mt-section'>
<div class='mt-section-header'>{col_name} <span class='mt-count'>{len(tasks)}</span></div>
{items}
</div>"""

    return HTMLResponse(f"""<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>My Tasks — FlowDeck</title>
<style>
body{{font-family:system-ui,sans-serif;background:#191919;color:#fff;margin:0;padding:20px}}
h1{{font-size:24px;margin:0 0 16px}}
.view-tabs{{display:flex;gap:4px;margin-bottom:20px;border-bottom:1px solid #333;padding-bottom:8px}}
.tab{{padding:6px 14px;border-radius:6px;cursor:pointer;color:#A0A0A0;font-size:13px;background:none;border:none;text-decoration:none}}
.tab:hover,.tab.active{{background:#333;color:#fff}}
.mt-section{{margin-bottom:24px}}
.mt-section-header{{font-size:14px;font-weight:600;color:#A0A0A0;margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}}
.mt-count{{color:#6B6B6B;font-weight:400}}
.mt-item{{display:flex;align-items:center;gap:10px;padding:8px 12px;background:#1a1a1a;border-radius:6px;margin-bottom:3px;border:1px solid #222}}
.mt-item:hover{{border-color:#444}}
.mt-icon{{font-size:16px}}
.mt-title{{flex:1;font-size:14px}}
.mt-status{{font-size:11px;padding:2px 8px;border-radius:4px}}
.mt-due{{font-size:11px;color:#A0A0A0}}
.mt-todo{{background:#333;color:#A0A0A0}}
.mt-in-progress{{background:#1a2744;color:#3366CC}}
.mt-done,.mt-complete{{background:#1a332a;color:#00CC66}}
.p_desc{{color:#A0A0A0;margin-top:8px}}
</style></head><body>
<h1>📋 My Tasks</h1>
<div class="view-tabs">
<a class="tab{' active' if view=='all' else ''}" href="?view=all">All</a>
<a class="tab{' active' if view=='today' else ''}" href="?view=today">Today</a>
<a class="tab{' active' if view=='overdue' else ''}" href="?view=overdue">Overdue</a>
<a class="tab{' active' if view=='upcoming' else ''}" href="?view=upcoming&days=7">Next 7 days</a>
</div>
{sections}
<p class="p_desc">{total} tasks across {len(grouped)} collections</p>
</body></html>""")


@router.get("/api")
async def my_tasks_api(request: Request, view: str = "all", days: int = 7):
    """API: return my tasks as JSON."""
    user = _get_current_user(request)
    user_login = user.get("login", "admin") if user else "admin"

    with get_conn() as conn:
        collections = conn.execute("SELECT * FROM collections ORDER BY name").fetchall()
        result = {}

        for col in collections:
            pages = conn.execute(
                "SELECT * FROM collection_pages WHERE collection_id=? AND parent_id IS NULL ORDER BY position",
                (col["id"],),
            ).fetchall()

            tasks = []
            for p in pages:
                props = json.loads(p["property_values_json"])
                tasks.append({
                    "id": p["id"], "title": p["title"], "icon": p["icon"],
                    "properties": props,
                })

            if tasks:
                result[col["name"]] = tasks

    return {"tasks": result, "total": sum(len(t) for t in result.values())}