"""§22.9 runtime deployment/project config (replaces VITE_APP_NAME) + §22.10
old-URL 308 redirects.

GET /api/deployment — the deployment name/tagline + the projects the caller can
see (§22.5: gated filtered by membership, unlisted omitted from enumeration),
plus the corpus-served `default_project_id` the M3-frontend guard keys on.
GET /api/projects/:id — one project's runtime config + optional theme overlay,
gated behind the §22.5 read gate (404 for a non-member of a gated project).
GET /rfc/{slug}, /proposals/{n} — §22.10 server-side 308s onto the new
`/p/<default>/…` routes (the SPA no longer owns these paths; nginx proxies them
to the backend instead of serving index.html).
"""
from __future__ import annotations

import json
from typing import Any

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

from . import auth, db, projects as projects_mod
from .config import Config


def make_router(config: Config) -> APIRouter:
    router = APIRouter()

    @router.get("/api/deployment")
    async def get_deployment(request: Request) -> dict[str, Any]:
        viewer = auth.current_user(request)
        dep = db.conn().execute(
            "SELECT name, tagline FROM deployment WHERE id = 1"
        ).fetchone()
        # §22.5: enumerate only public + (member-)gated; unlisted is never listed.
        visible = set(auth.visible_project_ids(viewer))
        rows = db.conn().execute(
            "SELECT id, name, type, visibility FROM projects "
            "WHERE visibility != 'unlisted' ORDER BY name"
        ).fetchall()
        projects = [
            {"id": r["id"], "name": r["name"], "type": r["type"], "visibility": r["visibility"]}
            for r in rows
            if r["id"] in visible
        ]
        return {
            "name": (dep["name"] if dep else "") or "",
            "tagline": (dep["tagline"] if dep else "") or "",
            # §22.10 / M3-frontend guard contract: which project the backend
            # serves the corpus for (the default, until Plan B serves per
            # project). The frontend renders corpus routes only for this id and
            # shows a "content not yet served" placeholder for any other.
            "default_project_id": projects_mod.resolved_default_id(config),
            "projects": projects,
        }

    @router.get("/api/projects/{project_id}")
    async def get_project(project_id: str, request: Request) -> dict[str, Any]:
        viewer = auth.current_user(request)
        # §22.5 read gate: a gated project 404s to a non-member (shape matches
        # an unknown id). unlisted is readable by direct id.
        auth.require_project_readable(viewer, project_id)
        row = db.conn().execute(
            "SELECT id, name, type, visibility, initial_state, config_json "
            "FROM projects WHERE id = ?",
            (project_id,),
        ).fetchone()
        if row is None:
            raise HTTPException(status_code=404, detail="Not found")
        try:
            cfg = json.loads(row["config_json"] or "{}")
        except (ValueError, TypeError):
            cfg = {}
        dep = db.conn().execute("SELECT tagline FROM deployment WHERE id = 1").fetchone()
        return {
            "id": row["id"],
            "name": row["name"],
            "tagline": (dep["tagline"] if dep else "") or "",
            "type": row["type"],
            "visibility": row["visibility"],
            "initial_state": row["initial_state"],
            "theme": cfg.get("theme") or {},
        }

    # §22.10 / §5 — server-side 308s off the old corpus-root URLs onto the
    # `/p/<default>/…` routes. 308 (not 301/302) preserves method + body and
    # is permanent, so external "RFC-0001" links and bookmarks land correctly.
    # nginx routes /rfc/ and /proposals/ to the backend so these are reached
    # before the SPA's index.html fallback.
    @router.get("/rfc/{slug}")
    async def redirect_old_rfc(slug: str) -> RedirectResponse:
        default_id = projects_mod.resolved_default_id(config)
        return RedirectResponse(url=f"/p/{default_id}/e/{slug}", status_code=308)

    @router.get("/rfc/{slug}/pr/{pr_number}")
    async def redirect_old_rfc_pr(slug: str, pr_number: int) -> RedirectResponse:
        default_id = projects_mod.resolved_default_id(config)
        return RedirectResponse(
            url=f"/p/{default_id}/e/{slug}/pr/{pr_number}", status_code=308
        )

    @router.get("/proposals/{pr_number}")
    async def redirect_old_proposal(pr_number: int) -> RedirectResponse:
        default_id = projects_mod.resolved_default_id(config)
        return RedirectResponse(url=f"/p/{default_id}/proposals/{pr_number}", status_code=308)

    return router