"""Plan/Ist-Verknüpfung — Gates, Journey, Beiträge (AP1.6)."""

from __future__ import annotations

from typing import Any, Literal, Optional

from psycopg2.extras import RealDictCursor

from db import get_connection
from services.initiatives import get_initiative

JourneyEventKind = Literal[
    "decision",
    "review",
    "evidence",
    "action",
    "backlog",
    "gate",
]


def validate_roadmap_item_in_initiative(
    cur,
    *,
    tenant_id: str,
    initiative_id: str,
    roadmap_item_id: Optional[str],
) -> None:
    if not roadmap_item_id:
        return
    cur.execute(
        """
        SELECT 1 FROM roadmap_items ri
        JOIN roadmaps r ON r.id = ri.roadmap_id AND r.tenant_id = ri.tenant_id
        WHERE ri.id = %s AND ri.tenant_id = %s AND r.initiative_id = %s
        """,
        (roadmap_item_id, tenant_id, initiative_id),
    )
    if not cur.fetchone():
        raise ValueError("Gate gehört nicht zu diesem Vorhaben")


def _iso(value: Any) -> Optional[str]:
    if not value:
        return None
    return value.isoformat() if hasattr(value, "isoformat") else str(value)


def list_gate_contributions(
    *, tenant_id: str, roadmap_item_id: str
) -> dict[str, Any]:
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT ri.id, ri.title, ri.status, r.initiative_id
                FROM roadmap_items ri
                JOIN roadmaps r ON r.id = ri.roadmap_id AND r.tenant_id = ri.tenant_id
                WHERE ri.id = %s AND ri.tenant_id = %s
                """,
                (roadmap_item_id, tenant_id),
            )
            gate = cur.fetchone()
            if not gate:
                raise ValueError("Gate nicht gefunden")
            initiative_id = str(gate["initiative_id"])

            cur.execute(
                """
                SELECT id, title, status, priority, converted_action_id
                FROM backlog_items
                WHERE tenant_id = %s AND initiative_id = %s AND roadmap_item_id = %s
                ORDER BY updated_at DESC
                """,
                (tenant_id, initiative_id, roadmap_item_id),
            )
            backlog = [dict(r) for r in cur.fetchall()]

            cur.execute(
                """
                SELECT id, title, status, priority, project_id
                FROM actions
                WHERE tenant_id = %s AND initiative_id = %s AND roadmap_item_id = %s
                ORDER BY updated_at DESC
                """,
                (tenant_id, initiative_id, roadmap_item_id),
            )
            actions = [dict(r) for r in cur.fetchall()]

            cur.execute(
                """
                SELECT id, title, status, parent_project_id
                FROM projects
                WHERE tenant_id = %s AND initiative_id = %s AND roadmap_item_id = %s
                ORDER BY updated_at DESC
                """,
                (tenant_id, initiative_id, roadmap_item_id),
            )
            projects = [dict(r) for r in cur.fetchall()]

            cur.execute(
                """
                SELECT t.id, t.title, t.status, t.action_id, a.title AS action_title
                FROM tasks t
                JOIN actions a ON a.id = t.action_id AND a.tenant_id = t.tenant_id
                WHERE t.tenant_id = %s AND a.initiative_id = %s AND t.roadmap_item_id = %s
                ORDER BY t.updated_at DESC
                """,
                (tenant_id, initiative_id, roadmap_item_id),
            )
            tasks = [dict(r) for r in cur.fetchall()]
    finally:
        conn.close()

    def _ids(rows: list[dict]) -> list[dict[str, Any]]:
        out = []
        for row in rows:
            item = dict(row)
            for key in item:
                if item[key] is not None and key.endswith("_id"):
                    item[key] = str(item[key])
            out.append(item)
        return out

    return {
        "roadmap_item_id": roadmap_item_id,
        "initiative_id": initiative_id,
        "gate_title": gate["title"],
        "gate_status": gate["status"],
        "backlog_items": _ids(backlog),
        "actions": _ids(actions),
        "projects": _ids(projects),
        "tasks": _ids(tasks),
        "counts": {
            "backlog": len(backlog),
            "actions": len(actions),
            "projects": len(projects),
            "tasks": len(tasks),
            "total": len(backlog) + len(actions) + len(projects) + len(tasks),
        },
    }


def list_journey_events(*, tenant_id: str, initiative_id: str) -> list[dict[str, Any]]:
    if not get_initiative(tenant_id=tenant_id, initiative_id=initiative_id):
        raise ValueError("Initiative nicht gefunden")

    events: list[dict[str, Any]] = []
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, title, status, outcome, created_at, updated_at
                FROM decisions
                WHERE tenant_id = %s AND initiative_id = %s
                """,
                (tenant_id, initiative_id),
            )
            for row in cur.fetchall():
                events.append(
                    {
                        "kind": "decision",
                        "entity_id": str(row["id"]),
                        "title": row["title"],
                        "status": row["status"],
                        "summary": row["outcome"] or row["status"],
                        "occurred_at": _iso(row["updated_at"] or row["created_at"]),
                        "roadmap_item_id": None,
                    }
                )

            cur.execute(
                """
                SELECT id, title, status, summary, created_at, updated_at, milestone_id, roadmap_item_id
                FROM reviews
                WHERE tenant_id = %s AND initiative_id = %s
                """,
                (tenant_id, initiative_id),
            )
            for row in cur.fetchall():
                rid = row.get("roadmap_item_id") or row.get("milestone_id")
                events.append(
                    {
                        "kind": "review",
                        "entity_id": str(row["id"]),
                        "title": row["title"],
                        "status": row["status"],
                        "summary": row["summary"] or row["status"],
                        "occurred_at": _iso(row["updated_at"] or row["created_at"]),
                        "roadmap_item_id": str(rid) if rid else None,
                    }
                )

            cur.execute(
                """
                SELECT id, title, status, description, created_at, updated_at,
                       roadmap_item_id, action_id
                FROM evidence
                WHERE tenant_id = %s AND initiative_id = %s
                """,
                (tenant_id, initiative_id),
            )
            for row in cur.fetchall():
                events.append(
                    {
                        "kind": "evidence",
                        "entity_id": str(row["id"]),
                        "title": row["title"],
                        "status": row["status"],
                        "summary": row["description"] or row["status"],
                        "occurred_at": _iso(row["updated_at"] or row["created_at"]),
                        "roadmap_item_id": (
                            str(row["roadmap_item_id"]) if row.get("roadmap_item_id") else None
                        ),
                        "action_id": str(row["action_id"]) if row.get("action_id") else None,
                    }
                )

            cur.execute(
                """
                SELECT id, title, status, created_at, updated_at, roadmap_item_id, project_id
                FROM actions
                WHERE tenant_id = %s AND initiative_id = %s
                """,
                (tenant_id, initiative_id),
            )
            for row in cur.fetchall():
                events.append(
                    {
                        "kind": "action",
                        "entity_id": str(row["id"]),
                        "title": row["title"],
                        "status": row["status"],
                        "summary": f"Arbeitspaket — {row['status']}",
                        "occurred_at": _iso(row["created_at"]),
                        "roadmap_item_id": (
                            str(row["roadmap_item_id"]) if row.get("roadmap_item_id") else None
                        ),
                        "project_id": str(row["project_id"]) if row.get("project_id") else None,
                    }
                )
                if row["status"] in ("done", "discarded") and row["updated_at"] != row["created_at"]:
                    events.append(
                        {
                            "kind": "action",
                            "entity_id": str(row["id"]),
                            "title": row["title"],
                            "status": row["status"],
                            "summary": f"Arbeitspaket abgeschlossen — {row['status']}",
                            "occurred_at": _iso(row["updated_at"]),
                            "roadmap_item_id": (
                                str(row["roadmap_item_id"])
                                if row.get("roadmap_item_id")
                                else None
                            ),
                            "project_id": (
                                str(row["project_id"]) if row.get("project_id") else None
                            ),
                        }
                    )

            cur.execute(
                """
                SELECT id, title, status, created_at, updated_at, roadmap_item_id, converted_action_id
                FROM backlog_items
                WHERE tenant_id = %s AND initiative_id = %s
                """,
                (tenant_id, initiative_id),
            )
            for row in cur.fetchall():
                if row["status"] == "converted":
                    events.append(
                        {
                            "kind": "backlog",
                            "entity_id": str(row["id"]),
                            "title": row["title"],
                            "status": row["status"],
                            "summary": "Backlog → Arbeitspaket committet",
                            "occurred_at": _iso(row["updated_at"]),
                            "roadmap_item_id": (
                                str(row["roadmap_item_id"])
                                if row.get("roadmap_item_id")
                                else None
                            ),
                            "action_id": (
                                str(row["converted_action_id"])
                                if row.get("converted_action_id")
                                else None
                            ),
                        }
                    )

            cur.execute(
                """
                SELECT ri.id, ri.title, ri.status, ri.updated_at, ri.created_at
                FROM roadmap_items ri
                JOIN roadmaps r ON r.id = ri.roadmap_id AND r.tenant_id = ri.tenant_id
                WHERE ri.tenant_id = %s AND r.initiative_id = %s
                  AND ri.status IN ('reached', 'moved', 'discarded', 'at_risk')
                """,
                (tenant_id, initiative_id),
            )
            for row in cur.fetchall():
                events.append(
                    {
                        "kind": "gate",
                        "entity_id": str(row["id"]),
                        "title": row["title"],
                        "status": row["status"],
                        "summary": f"Zielzustand — {row['status']}",
                        "occurred_at": _iso(row["updated_at"] or row["created_at"]),
                        "roadmap_item_id": str(row["id"]),
                    }
                )
    finally:
        conn.close()

    events = [e for e in events if e.get("occurred_at")]
    events.sort(key=lambda e: e["occurred_at"], reverse=True)
    return events