"""Medien-Archiv (Liste, Datei) und Lifecycle — MEDIA_ASSETS_AND_ARCHIVE_SPEC."""
from __future__ import annotations

from typing import Any, Literal, Optional

from fastapi import APIRouter, Depends, HTTPException, Query, Request
from pydantic import BaseModel, Field, model_validator

from club_tenancy import (
    assert_valid_governance_visibility,
    club_ids_for_profile_with_roles,
    is_platform_admin,
    is_superadmin,
    library_content_visible_to_profile,
)
from db import get_db, get_cursor, r2d
from media_lifecycle import (
    LC_ACTIVE,
    LC_TRASH_HIDDEN,
    LC_TRASH_SOFT,
    assert_can_edit_media_asset_metadata,
    assert_can_manage_media_asset_lifecycle,
    assert_can_trash_soft,
    fetch_media_asset_row,
    purge_media_asset,
    reactivate_media_asset_from_trash,
    superadmin_force_lifecycle_state,
    superadmin_hard_delete_media_asset,
    transition_recover_from_hidden,
    transition_to_trash_hidden,
    transition_to_trash_soft,
)
from media_storage import get_effective_media_root, path_under_media_root
from tenant_context import TenantContext, get_tenant_context, get_tenant_context_flexible

router = APIRouter(prefix="/api/media-assets", tags=["media-assets"])


class MediaLifecycleBody(BaseModel):
    action: Literal[
        "trash_soft",
        "trash_hidden",
        "recover",
        "purge",
        "reactivate",
        "superadmin_force_lifecycle",
        "superadmin_hard_delete",
    ]
    target_lifecycle: Optional[Literal["active", "trash_soft", "trash_hidden"]] = None

    @model_validator(mode="after")
    def _target_lifecycle_rules(self):
        if self.action == "superadmin_force_lifecycle":
            if not self.target_lifecycle:
                raise ValueError("target_lifecycle ist für diese Aktion erforderlich")
        elif self.target_lifecycle is not None:
            raise ValueError("target_lifecycle nur bei superadmin_force_lifecycle")
        return self


class MediaAssetPatch(BaseModel):
    copyright_notice: Optional[str] = Field(None, max_length=8000)
    original_filename: Optional[str] = Field(None, max_length=300)
    visibility: Optional[str] = Field(None, pattern="^(private|club|official)$")
    club_id: Optional[int] = None


class MediaBulkLifecycleBody(BaseModel):
    media_asset_ids: list[int] = Field(..., min_length=1, max_length=200)
    action: Literal[
        "trash_soft",
        "trash_hidden",
        "recover",
        "purge",
        "reactivate",
        "superadmin_force_lifecycle",
        "superadmin_hard_delete",
    ]
    target_lifecycle: Optional[Literal["active", "trash_soft", "trash_hidden"]] = None

    @model_validator(mode="after")
    def _bulk_target(self):
        if self.action == "superadmin_force_lifecycle" and not self.target_lifecycle:
            raise ValueError("target_lifecycle ist für diese Aktion erforderlich")
        if self.action != "superadmin_force_lifecycle" and self.target_lifecycle is not None:
            raise ValueError("target_lifecycle nur bei superadmin_force_lifecycle")
        return self


class MediaBulkPatchBody(BaseModel):
    media_asset_ids: list[int] = Field(..., min_length=1, max_length=200)
    copyright_notice: Optional[str] = Field(None, max_length=8000)
    original_filename: Optional[str] = Field(None, max_length=300)
    visibility: Optional[str] = Field(None, pattern="^(private|club|official)$")
    club_id: Optional[int] = None


_LIFECYCLE_LIST_FILTERS = frozenset({"active", "trash_soft", "trash_hidden", "all"})


def _effective_media_patch_fields(patch_fields: dict, asset: dict) -> dict:
    """Nach visibility-Wechsel club_id konsistent setzen (official/private → NULL)."""
    eff = dict(patch_fields)
    if eff.get("visibility") is not None:
        v = str(eff["visibility"]).strip().lower()
        if v in ("official", "private"):
            eff["club_id"] = None
        elif v == "club" and "club_id" not in eff:
            eff["club_id"] = asset.get("club_id")
    return eff


def _lifecycle_where_sql(lifecycle: str) -> str:
    lc = (lifecycle or "active").strip().lower()
    if lc not in _LIFECYCLE_LIST_FILTERS:
        raise HTTPException(status_code=400, detail="Ungültiger lifecycle-Filter")
    if lc == "active":
        return "ma.lifecycle_state = 'active'"
    if lc == "trash_soft":
        return "ma.lifecycle_state = 'trash_soft'"
    if lc == "trash_hidden":
        return "ma.lifecycle_state = 'trash_hidden'"
    return "ma.lifecycle_state IN ('active', 'trash_soft', 'trash_hidden')"


def _fetch_asset_file_row(cur: Any, asset_id: int) -> Optional[dict]:
    cur.execute(
        """SELECT id, visibility, club_id, uploaded_by_profile_id, lifecycle_state,
                  storage_key, mime_type, original_filename
           FROM media_assets WHERE id = %s""",
        (asset_id,),
    )
    row = cur.fetchone()
    return r2d(row) if row else None


def _assert_can_view_archive_asset(cur: Any, tenant: TenantContext, asset: dict) -> None:
    if not library_content_visible_to_profile(
        cur,
        tenant.profile_id,
        (asset.get("visibility") or "").strip().lower(),
        asset.get("club_id"),
        asset.get("uploaded_by_profile_id"),
        tenant.global_role,
    ):
        raise HTTPException(status_code=403, detail="Keine Berechtigung für dieses Medium")


def _item_permissions(row: dict, tenant: TenantContext, admin_club_ids: set[int]) -> dict:
    """Berechnete UI-/Policy-Flags pro Zeile (ohne zusätzliche DB)."""
    role_raw = tenant.global_role
    role = (role_raw or "").strip().lower()
    pid = int(tenant.profile_id)
    sup = is_superadmin(role_raw)
    plat = is_platform_admin(role_raw)
    vis = (row.get("visibility") or "private").strip().lower()
    uid = row.get("uploaded_by_profile_id")
    cid = row.get("club_id")
    lc = (row.get("lifecycle_state") or "active").strip().lower()
    is_owner = uid is not None and int(uid) == pid
    club_mgr = plat or (cid is not None and int(cid) in admin_club_ids)

    edit_metadata = (
        sup
        or (vis == "official" and plat)
        or (vis == "club" and club_mgr)
        or (vis == "private" and is_owner)
    )

    trash_soft = lc == "active" and (
        sup or plat or (vis == "private" and is_owner) or (vis == "club" and club_mgr)
    )
    if vis == "official" and not (sup or plat):
        trash_soft = False

    can_manage_adv = (
        sup
        or plat
        or (vis == "private" and is_owner)
        or (vis == "club" and club_mgr)
    )

    trash_hidden = lc in ("active", "trash_soft") and can_manage_adv
    recover_from_hidden = lc == "trash_hidden" and can_manage_adv
    reactivate = lc in ("trash_soft", "trash_hidden") and can_manage_adv
    purge = lc == "trash_hidden" and sup

    return {
        "edit_metadata": edit_metadata,
        "change_visibility": edit_metadata,
        "trash_soft": trash_soft,
        "trash_hidden": trash_hidden,
        "recover": recover_from_hidden,
        "reactivate": reactivate,
        "purge": purge,
        "superadmin_lifecycle": sup,
        "superadmin_hard_delete": sup,
    }


def _apply_lifecycle_action(
    cur: Any,
    conn: Any,
    asset_id: int,
    body: MediaLifecycleBody,
    tenant: TenantContext,
) -> dict:
    asset = fetch_media_asset_row(cur, asset_id)
    if not asset:
        raise HTTPException(status_code=404, detail="Medium nicht gefunden")

    action = body.action
    role_raw = tenant.global_role

    if action == "superadmin_hard_delete":
        if not is_superadmin(role_raw):
            raise HTTPException(status_code=403, detail="Nur Superadmin")
        ok = superadmin_hard_delete_media_asset(cur, conn, asset_id)
        if not ok:
            raise HTTPException(status_code=404, detail="Medium nicht gefunden")
        return {"ok": True, "hard_deleted": asset_id}

    if action == "superadmin_force_lifecycle":
        if not is_superadmin(role_raw):
            raise HTTPException(status_code=403, detail="Nur Superadmin")
        tl = body.target_lifecycle or "active"
        mp = {"active": LC_ACTIVE, "trash_soft": LC_TRASH_SOFT, "trash_hidden": LC_TRASH_HIDDEN}
        return superadmin_force_lifecycle_state(cur, conn, asset_id, mp[tl])

    if action == "purge":
        if not is_superadmin(role_raw):
            raise HTTPException(status_code=403, detail="Endgültiges Löschen nur als Superadmin")
        state = (asset.get("lifecycle_state") or "").strip().lower()
        if state != LC_TRASH_HIDDEN:
            raise HTTPException(
                status_code=400,
                detail="Nur ausgeblendete Medien (Stufe 2) dürfen mit dieser Aktion entfernt werden",
            )
        if not purge_media_asset(cur, conn, asset_id):
            raise HTTPException(status_code=400, detail="Löschen nicht möglich")
        return {"ok": True, "purged": asset_id}

    if action == "trash_soft":
        assert_can_trash_soft(cur, tenant, asset)
        return transition_to_trash_soft(cur, conn, asset_id)
    if action == "trash_hidden":
        assert_can_manage_media_asset_lifecycle(cur, tenant, asset)
        return transition_to_trash_hidden(cur, conn, asset_id)
    if action == "recover":
        assert_can_manage_media_asset_lifecycle(cur, tenant, asset)
        return transition_recover_from_hidden(cur, conn, asset_id)
    if action == "reactivate":
        assert_can_manage_media_asset_lifecycle(cur, tenant, asset)
        return reactivate_media_asset_from_trash(cur, conn, asset_id)

    raise HTTPException(status_code=500, detail="Interner Fehler: lifecycle action")


@router.get("")
def list_media_assets(
    tenant: TenantContext = Depends(get_tenant_context),
    q: Optional[str] = Query(None, max_length=120),
    lifecycle: str = Query(
        "active",
        description="active | trash_soft | trash_hidden | all (nicht purgierte Zustände)",
    ),
    limit: int = Query(30, ge=1, le=100),
    offset: int = Query(0, ge=0),
):
    lc_where = _lifecycle_where_sql(lifecycle)
    role = tenant.global_role or ""
    is_adm = is_platform_admin(role)
    profile_id = tenant.profile_id
    needle = (q or "").strip()
    params: list[Any] = [is_adm, profile_id, profile_id]
    search_sql = ""
    if needle:
        like = f"%{needle}%"
        params.extend([like, like])
        search_sql = " AND (ma.original_filename ILIKE %s OR ma.storage_key ILIKE %s)"
    params.extend([limit, offset])

    with get_db() as conn:
        cur = get_cursor(conn)
        admin_club_ids = club_ids_for_profile_with_roles(cur, profile_id, "club_admin")
        cur.execute(
            f"""SELECT ma.id, ma.mime_type, ma.byte_size, ma.original_filename, ma.visibility, ma.club_id,
                       ma.uploaded_by_profile_id, ma.lifecycle_state, ma.created_at, ma.sha256,
                       ma.copyright_notice, ma.storage_key,
                       pr.name AS uploader_name,
                       pr.email AS uploader_email,
                       cl.name AS club_name
                FROM media_assets ma
                LEFT JOIN profiles pr ON pr.id = ma.uploaded_by_profile_id
                LEFT JOIN clubs cl ON cl.id = ma.club_id
                WHERE {lc_where}
                  AND (
                    %s
                    OR lower(trim(ma.visibility)) = 'official'
                    OR (
                      lower(trim(ma.visibility)) = 'private'
                      AND ma.uploaded_by_profile_id = %s
                    )
                    OR (
                      lower(trim(ma.visibility)) = 'club'
                      AND EXISTS (
                        SELECT 1 FROM club_members cm
                        WHERE cm.profile_id = %s
                          AND cm.club_id = ma.club_id
                          AND cm.status = 'active'
                      )
                    )
                  )
                  {search_sql}
                ORDER BY ma.updated_at DESC NULLS LAST, ma.created_at DESC
                LIMIT %s OFFSET %s""",
            params,
        )
        rows = [r2d(r) for r in cur.fetchall()]
        show_uploader = is_superadmin(role) or is_platform_admin(role) or bool(admin_club_ids)
        show_club = is_superadmin(role) or is_platform_admin(role)
        for r in rows:
            r["permissions"] = _item_permissions(r, tenant, admin_club_ids)
            if not show_uploader:
                r["uploader_name"] = None
                r["uploader_email"] = None
            if not show_club:
                r["club_name"] = None
        viewer = {
            "show_uploader_meta": show_uploader,
            "show_club_meta": show_club,
            "is_superadmin": is_superadmin(role),
            "is_platform_admin": is_platform_admin(role),
        }

    return {
        "items": rows,
        "limit": limit,
        "offset": offset,
        "lifecycle": lifecycle.strip().lower(),
        "viewer": viewer,
    }


@router.api_route("/{asset_id}/file", methods=["GET", "HEAD"])
def download_media_asset_file(
    request: Request,
    asset_id: int,
    tenant: TenantContext = Depends(get_tenant_context_flexible),
):
    """Direktzugriff auf Archiv-Datei (Thumbnail/Vorschau); Auth wie Übungs-Medien (?ssetoken)."""
    from routers.exercises import _binary_media_response

    with get_db() as conn:
        cur = get_cursor(conn)
        asset = _fetch_asset_file_row(cur, asset_id)
        if not asset:
            raise HTTPException(status_code=404, detail="Medium nicht gefunden")
        lc = (asset.get("lifecycle_state") or "").strip().lower()
        if lc == "active":
            _assert_can_view_archive_asset(cur, tenant, asset)
        elif lc in ("trash_soft", "trash_hidden"):
            assert_can_manage_media_asset_lifecycle(cur, tenant, asset)
        else:
            raise HTTPException(status_code=404, detail="Medium nicht verfügbar")

        sk = asset.get("storage_key")
        if not sk:
            raise HTTPException(status_code=404, detail="Keine Datei hinterlegt")

        media_root = get_effective_media_root(cur)
        abs_p = path_under_media_root(media_root, str(sk))
        if not abs_p or not abs_p.is_file():
            raise HTTPException(status_code=404, detail="Datei nicht gefunden")

        mime = asset.get("mime_type") or "application/octet-stream"
        fname = asset.get("original_filename") or abs_p.name
        return _binary_media_response(abs_p, mime, str(fname) if fname else None, request)


@router.post("/{asset_id}/lifecycle")
def post_media_asset_lifecycle(
    asset_id: int,
    body: MediaLifecycleBody,
    tenant: TenantContext = Depends(get_tenant_context),
):
    with get_db() as conn:
        cur = get_cursor(conn)
        return _apply_lifecycle_action(cur, conn, asset_id, body, tenant)


@router.post("/bulk-lifecycle")
def bulk_media_lifecycle(
    body: MediaBulkLifecycleBody,
    tenant: TenantContext = Depends(get_tenant_context),
):
    inner = MediaLifecycleBody(action=body.action, target_lifecycle=body.target_lifecycle)
    updated: list[int] = []
    failed: list[dict] = []
    with get_db() as conn:
        cur = get_cursor(conn)
        for aid in sorted(set(int(x) for x in body.media_asset_ids if x and int(x) > 0)):
            try:
                _apply_lifecycle_action(cur, conn, aid, inner, tenant)
                updated.append(aid)
            except HTTPException as he:
                msg = he.detail if isinstance(he.detail, str) else str(he.detail)
                failed.append({"id": aid, "detail": msg})
    return {"updated": updated, "failed": failed, "updated_count": len(updated), "failed_count": len(failed)}


@router.post("/bulk-patch")
def bulk_media_patch(
    body: MediaBulkPatchBody,
    tenant: TenantContext = Depends(get_tenant_context),
):
    raw = body.model_dump(exclude_unset=True) if hasattr(body, "model_dump") else body.dict(exclude_unset=True)
    patch_fields = {k: v for k, v in raw.items() if k != "media_asset_ids" and v is not None}
    if not patch_fields:
        raise HTTPException(status_code=400, detail="Keine Felder zum Aktualisieren")

    updated: list[int] = []
    failed: list[dict] = []
    profile_id = tenant.profile_id
    role = tenant.global_role

    with get_db() as conn:
        cur = get_cursor(conn)
        for asset_id in sorted(set(int(x) for x in body.media_asset_ids if x and int(x) > 0)):
            try:
                cur.execute(
                    """SELECT id, visibility, club_id, uploaded_by_profile_id, lifecycle_state,
                              copyright_notice, original_filename
                       FROM media_assets WHERE id = %s""",
                    (asset_id,),
                )
                row = cur.fetchone()
                if not row:
                    failed.append({"id": asset_id, "detail": "Medium nicht gefunden"})
                    continue
                asset = r2d(row)
                assert_can_edit_media_asset_metadata(cur, tenant, asset)

                eff = _effective_media_patch_fields(patch_fields, asset)
                next_vis = str(eff.get("visibility", asset["visibility"])).strip().lower()
                next_cid = eff["club_id"] if "club_id" in eff else asset.get("club_id")
                if "visibility" in patch_fields or "club_id" in patch_fields:
                    assert_valid_governance_visibility(
                        cur,
                        profile_id,
                        role,
                        next_vis,
                        int(next_cid) if next_cid is not None else None,
                    )

                sets: list[str] = []
                vals: list[Any] = []
                if "copyright_notice" in patch_fields:
                    sets.append("copyright_notice = %s")
                    vals.append(patch_fields["copyright_notice"])
                if "original_filename" in patch_fields:
                    sets.append("original_filename = %s")
                    vals.append(patch_fields["original_filename"])
                if "visibility" in patch_fields or "club_id" in patch_fields:
                    sets.append("visibility = %s")
                    vals.append(str(eff.get("visibility", asset["visibility"])).strip())
                    sets.append("club_id = %s")
                    vals.append(eff.get("club_id"))
                if not sets:
                    failed.append({"id": asset_id, "detail": "Nichts zu aktualisieren"})
                    continue
                sets.append("updated_at = NOW()")
                vals.append(asset_id)
                cur.execute(
                    f"UPDATE media_assets SET {', '.join(sets)} WHERE id = %s",
                    tuple(vals),
                )
                conn.commit()
                updated.append(asset_id)
            except HTTPException as he:
                msg = he.detail if isinstance(he.detail, str) else str(he.detail)
                failed.append({"id": asset_id, "detail": msg})
    return {"updated": updated, "failed": failed, "updated_count": len(updated), "failed_count": len(failed)}


@router.patch("/{asset_id}")
def patch_media_asset(
    asset_id: int,
    body: MediaAssetPatch,
    tenant: TenantContext = Depends(get_tenant_context),
):
    profile_id = tenant.profile_id
    role = tenant.global_role
    data = body.model_dump(exclude_unset=True) if hasattr(body, "model_dump") else body.dict(exclude_unset=True)
    if not data:
        raise HTTPException(status_code=400, detail="Keine Felder zum Aktualisieren")

    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute(
            """SELECT id, visibility, club_id, uploaded_by_profile_id, lifecycle_state,
                      copyright_notice, original_filename
               FROM media_assets WHERE id = %s""",
            (asset_id,),
        )
        row = cur.fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="Medium nicht gefunden")
        asset = r2d(row)
        assert_can_edit_media_asset_metadata(cur, tenant, asset)

        eff = _effective_media_patch_fields(data, asset)
        next_vis = str(eff.get("visibility", asset["visibility"])).strip().lower()
        next_cid = eff["club_id"] if "club_id" in eff else asset.get("club_id")
        if "visibility" in data or "club_id" in data:
            assert_valid_governance_visibility(
                cur,
                profile_id,
                role,
                next_vis,
                int(next_cid) if next_cid is not None else None,
            )

        sets: list[str] = []
        vals: list[Any] = []
        if "copyright_notice" in data:
            sets.append("copyright_notice = %s")
            vals.append(data["copyright_notice"])
        if "original_filename" in data:
            sets.append("original_filename = %s")
            vals.append(data["original_filename"])
        if "visibility" in data or "club_id" in data:
            sets.append("visibility = %s")
            vals.append(str(eff.get("visibility", asset["visibility"])).strip())
            sets.append("club_id = %s")
            vals.append(eff.get("club_id"))
        if sets:
            sets.append("updated_at = NOW()")
            vals.append(asset_id)
            cur.execute(
                f"UPDATE media_assets SET {', '.join(sets)} WHERE id = %s",
                tuple(vals),
            )
        conn.commit()
        cur.execute(
            """SELECT id, mime_type, byte_size, original_filename, visibility, club_id,
                      uploaded_by_profile_id, lifecycle_state, created_at, sha256, copyright_notice
               FROM media_assets WHERE id = %s""",
            (asset_id,),
        )
        out = r2d(cur.fetchone())
    return out