import os

from fastapi import APIRouter


def init_pods_router(
    session,
    podman_api_base: str,
    workloads_dir: str,
    podman_get_json,
    podman_post,
    podman_delete,
    systemctl_func,
    podman_action_post,
    map_pod_to_unit,
    systemd_then_podman,
    build_pod_to_containers_map,
) -> APIRouter:
    router = APIRouter(tags=["pods"])

    def _append_podman_pods_dashboard_rows(dashboard: list, api_pods: list, pod_to_containers: dict):
        # preserves original api_pods iteration order
        for p in api_pods:
            name = p.get("Name")
            status = p.get("Status", "unknown")
            unit = map_pod_to_unit(name) if name else ""
            dashboard.append({
                "Name": name,
                "Status": status,
                "Containers": pod_to_containers.get(name, []),
                "Unit": unit,
                "Source": "podman",
            })

    def _append_defined_pods_dashboard_rows(dashboard: list, by_name: dict, root_dir: str):
        # preserves original os.walk order and file iteration order
        for root, _, files in os.walk(root_dir):
            for f in files:
                if f.endswith((".yaml", ".yml")):
                    base = os.path.splitext(os.path.basename(f))[0]
                    pod_name = f"pod{base}"
                    unit_name = map_pod_to_unit(pod_name)

                    if pod_name not in by_name:
                        code, out = systemctl_func(["systemctl", "--user", "is-active", unit_name])
                        status = (out or "").strip() or ("active" if code == 0 else "inactive")
                        dashboard.append({
                            "Name": pod_name,
                            "Status": status,
                            "Containers": [],
                            "Unit": unit_name,
                            "Source": "systemd",
                        })

    def try_systemd_pod_action(action: str, podname: str):
        # If systemd unit exists/allowed, prefer it.
        unit = map_pod_to_unit(podname)
        if not unit:
            return None
        code, out = systemctl_func(["systemctl", "--user", action, unit])
        return {
            "method": "systemd",
            "pod": podname,
            "unit": unit,
            "cmd": f"systemctl --user {action} {unit}",
            "exit": code,
            "output": out,
        }

    @router.get("/pods")
    def list_pods():
        # Cruciaal: ?all=true zorgt dat EXIT_STATE pods ook getoond worden
        url = f"{podman_api_base}/libpod/pods/json?all=true"
        return podman_get_json(url)

    @router.post("/actions/{action}/{name}")
    def take_action(action: str, name: str):
        # Legacy endpoint (keep behavior)
        possible_names = [name, f"pod{name}", f"pod-{name}"]

        if action == "start":
            # STAP 1: Probeer direct de pod te starten (de 'Cockpit' methode)
            for target in possible_names:
                res = podman_post(f"{podman_api_base}/libpod/pods/{target}/start")
                if res.status_code in (200, 204):
                    return {"status": "started", "target": target, "method": "direct"}

            # STAP 2: Als direct starten faalt, probeer dan YAML opnieuw te deployen
            target_path = None
            for ext in (".yaml", ".yml"):
                cand = os.path.join(workloads_dir, f"{name}{ext}")
                if os.path.exists(cand):
                    target_path = cand
                    break

            if target_path:
                with open(target_path, 'r') as file:
                    yaml_content = file.read()
                res = podman_post(f"{podman_api_base}/libpod/kube/play", data=yaml_content)

                # SPECIALE CASE: Pod bestaat al, forceer dan restart
                if res.status_code == 500 and "already exists" in res.text:
                    print(f"DEBUG: Forceer herstart voor {name} wegens conflict")
                    for target in possible_names:
                        podman_delete(f"{podman_api_base}/libpod/pods/{target}?force=true")
                    # Probeer het nu opnieuw
                    retry_res = podman_post(f"{podman_api_base}/libpod/kube/play", data=yaml_content)
                    return retry_res.json()

                return res.json()

            return {"status": "unknown", "method": "no_yaml_found"}

        if action == "stop":
            for target in possible_names:
                res = podman_post(f"{podman_api_base}/libpod/pods/{target}/stop")
                if res.status_code in (200, 204):
                    return {"status": "stopped", "target": target}
            return {"status": "not found"}

        return {"status": "unknown"}

    @router.get("/pods-dashboard")
    def pods_dashboard():
        dashboard = []

        # 0) Bouw mapping: pod_name -> [container_names...]
        containers = podman_get_json(f"{podman_api_base}/libpod/containers/json?all=true")
        pod_to_containers = build_pod_to_containers_map(containers)

        # 1) A) echte pods
        api_pods = podman_get_json(f"{podman_api_base}/libpod/pods/json?all=true")
        by_name = {p.get("Name"): p for p in api_pods}

        _append_podman_pods_dashboard_rows(dashboard, api_pods, pod_to_containers)

        # 1) B) defined pods via workloads scan
        # Based on YAML files in WORKLOADS_DIR; show even if not running.
        _append_defined_pods_dashboard_rows(dashboard, by_name, workloads_dir)

        return dashboard

    @router.post("/pods/actions/{action}/{podname}")
    def pod_action_prefer_systemd(action: str, podname: str):
        if action not in ("start", "stop", "restart"):
            return {"error": "Invalid action"}, 400

        def _systemd_call():
            return try_systemd_pod_action(action, podname)

        def _podman_call(systemd_res):
            if systemd_res:
                note = "systemd failed; falling back to podman"
                podman = podman_action_post("pods", podname, action).json()
                return {"method": "systemd_then_podman", "note": note, "systemd": systemd_res, "podman": podman}
            return {"method": "podman", "result": podman_action_post("pods", podname, action).json()}

        return systemd_then_podman(_systemd_call, _podman_call)

    return router