"""FlowDeck — Board Kanban."""
from __future__ import annotations

import json
import logging
from datetime import datetime

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

from app.db import get_conn
from app.services.gitea_client import gitea

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


def _ensure_board(owner: str, repo: str) -> dict:
    """Get or create a board row, return columns config."""
    with get_conn() as conn:
        row = conn.execute(
            "SELECT id, columns_json FROM boards WHERE project_owner=? AND project_name=?",
            (owner, repo),
        ).fetchone()
        if not row:
            cur = conn.execute(
                "INSERT INTO boards (project_owner, project_name) VALUES (?, ?)",
                (owner, repo),
            )
            conn.commit()
            return {"id": cur.lastrowid, "columns": ["Backlog", "À faire", "En cours", "Révision", "Terminé"]}
        return {"id": row["id"], "columns": json.loads(row["columns_json"])}


def _get_cards(board_id: int) -> list[dict]:
    """Get all cards for a board, ordered by column + position."""
    with get_conn() as conn:
        rows = conn.execute(
            "SELECT * FROM cards WHERE board_id=? ORDER BY column_name, position",
            (board_id,),
        ).fetchall()
    return [dict(r) for r in rows]


@router.get("/{owner}/{repo}", response_class=HTMLResponse)
async def board(
    request: Request,
    owner: str,
    repo: str,
    milestone: str = "",
    label: str = "",
    assignee: str = "",
    fragment: bool = False,
):
    """Kanban board for a Gitea project."""
    try:
        issues = await gitea.get_issues(owner, repo, state="all")
        labels_list = await gitea.get_labels(owner, repo)
        milestones = await gitea.get_milestones(owner, repo)

        if milestone:
            issues = [i for i in issues if i.get("milestone", {}).get("title") == milestone]
        if label:
            issues = [i for i in issues if any(lbl["name"] == label for lbl in i.get("labels", []))]
        if assignee:
            issues = [i for i in issues if i.get("assignee", {}).get("login") == assignee]

        prs = [i for i in issues if i.get("pull_request")]
        issues_only = [i for i in issues if not i.get("pull_request")]

        board_info = _ensure_board(owner, repo)
        columns = board_info["columns"]
        cards = _get_cards(board_info["id"])

        column_map: dict[str, list[dict]] = {col: [] for col in columns}
        card_by_issue = {c["gitea_issue_id"]: c for c in cards if c["gitea_issue_id"]}

        for issue in issues_only:
            col = _issue_column(issue, columns, board_info["id"])
            issue["_col"] = col
            issue["_card"] = card_by_issue.get(issue["number"])
            column_map[col].append(issue)

    except Exception as e:
        from httpx import HTTPStatusError
        if isinstance(e, HTTPStatusError) and e.response is not None and e.response.status_code == 404:
            return HTMLResponse(
                '<div style="padding:48px;text-align:center">'
                f'<h2 style="color:#8b949e">Projet introuvable</h2>'
                f'<p style="color:#8b949e">{owner}/{repo} n\'existe pas sur Gitea.</p>'
                '<a href="/" class="btn btn-primary" style="margin-top:16px">Retour aux projets</a></div>',
                status_code=404)
        logger.error("Board error: %s", e)
        return HTMLResponse(f"<p class='error'>Erreur: {e}</p>", status_code=500)

    from jinja2 import Environment, FileSystemLoader
    from datetime import datetime
    from app.config import settings
    from app.auth.session import SessionManager

    env = Environment(loader=FileSystemLoader("app/templates"))
    now_str = datetime.now().isoformat()[:10]
    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))

    ctx = dict(
        request=request, owner=owner, repo=repo, columns=columns,
        column_map=column_map, labels=labels_list, milestones=milestones,
        current_milestone=milestone, current_label=label, current_assignee=assignee,
        prs=prs, settings=settings, now=now_str, user=user,
    )

    if fragment:
        template = env.get_template("board_fragment.html")
    else:
        template = env.get_template("board.html")
    return template.render(**ctx)


def _issue_column(issue: dict, columns: list[str], board_id: int) -> str:
    """Determine which column an issue belongs to."""
    # ponytail: closed = Terminé, else check label mapping
    if issue.get("state") == "closed":
        return "Terminé" if "Terminé" in columns else columns[-1]

    # Check label-to-column mapping in DB
    issue_labels = [lbl["name"] for lbl in issue.get("labels", [])]
    with get_conn() as conn:
        for lbl in issue_labels:
            row = conn.execute(
                "SELECT column_name FROM col_mapping WHERE board_id=? AND gitea_label=?",
                (board_id, lbl),
            ).fetchone()
            if row and row["column_name"] in columns:
                return row["column_name"]

    # Default: Backlog
    return columns[0] if columns else "Backlog"