"use client";

import { useEffect, useMemo, useState } from "react";
import { toast } from "sonner";
import { Button } from "@/components/ui/button";
import { Combobox } from "@/components/ui/combobox";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { placeStructure } from "@/app/(frontend)/logistics/map/actions";
import {
  validatePlacement,
  type NodeInput,
  type StructureInput,
  type ZoneInput,
} from "@/lib/map/placement";
import type { MapPoint } from "@/lib/map/points";
import type { MapConfig, NodeFeature, StructureFeature, ZoneFeature } from "@/lib/map/types";

interface BlueprintOption {
  id: number;
  name: string;
  terrainType: "land" | "water" | null;
  constructionDurationMinutes: number | null;
  requiredTech: string[];
  materials: { resource: number; resourceName: string; amount: number | null }[];
  resourcesInRange: { resource: number | null; range: number | null }[];
  structuresInRange: { structure: number | null; range: number | null }[];
}

interface FactionOption {
  id: number;
  name: string;
}

interface PlacementDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  mapConfig: MapConfig | null;
  point: MapPoint;
  zones: ZoneFeature[];
  nodes: NodeFeature[];
  structures: StructureFeature[];
  onPlaced: () => void;
}

export function PlacementDialog({
  open,
  onOpenChange,
  mapConfig,
  point,
  zones,
  nodes,
  structures,
  onPlaced,
}: PlacementDialogProps) {
  const [blueprints, setBlueprints] = useState<BlueprintOption[]>([]);
  const [factions, setFactions] = useState<FactionOption[]>([]);
  const [blueprintId, setBlueprintId] = useState<string>("");
  const [name, setName] = useState("");
  const [factionId, setFactionId] = useState<string>("none");
  const [submitting, setSubmitting] = useState(false);

  useEffect(() => {
    if (!open) return;
    let cancelled = false;
    void (async () => {
      const [blueprintRes, factionRes] = await Promise.all([
        fetch("/api/structures?limit=500&depth=1&sort=name", { cache: "no-store" }),
        fetch("/api/factions?limit=200&depth=0&sort=name", { cache: "no-store" }),
      ]);
      if (cancelled) return;
      if (blueprintRes.ok) {
        const body = (await blueprintRes.json()) as {
          docs: {
            id: number;
            name: string;
            terrainType?: string | null;
            constructionDurationMinutes?: number | null;
            requiredTech?: { name?: string }[] | number[];
            materials?: {
              resource?: { id: number; name?: string } | number;
              amount?: number | null;
            }[];
            resourcesInRange?: {
              resource?: { id: number } | number | null;
              range?: number | null;
            }[];
            structuresInRange?: {
              structure?: { id: number } | number | null;
              range?: number | null;
            }[];
          }[];
        };
        setBlueprints(
          body.docs.map((doc) => ({
            id: doc.id,
            name: doc.name,
            terrainType: (doc.terrainType as "land" | "water" | null | undefined) ?? "land",
            constructionDurationMinutes: doc.constructionDurationMinutes ?? null,
            requiredTech: (doc.requiredTech ?? [])
              .filter(
                (tech): tech is { name?: string } => typeof tech === "object" && tech !== null,
              )
              .map((tech) => tech.name ?? "Unknown"),
            materials: (doc.materials ?? []).map((material) => ({
              resource:
                typeof material.resource === "object" && material.resource !== null
                  ? material.resource.id
                  : 0,
              resourceName:
                typeof material.resource === "object" && material.resource !== null
                  ? (material.resource.name ?? "Resource")
                  : "Resource",
              amount: material.amount ?? 0,
            })),
            resourcesInRange: (doc.resourcesInRange ?? []).map((requirement) => ({
              resource:
                typeof requirement.resource === "object" && requirement.resource !== null
                  ? requirement.resource.id
                  : null,
              range: requirement.range ?? null,
            })),
            structuresInRange: (doc.structuresInRange ?? []).map((requirement) => ({
              structure:
                typeof requirement.structure === "object" && requirement.structure !== null
                  ? requirement.structure.id
                  : null,
              range: requirement.range ?? null,
            })),
          })),
        );
      }
      if (factionRes.ok) {
        const body = (await factionRes.json()) as { docs: { id: number; name: string }[] };
        setFactions(body.docs);
      }
    })();
    return () => {
      cancelled = true;
    };
  }, [open]);

  const blueprint = useMemo(
    () => blueprints.find((option) => option.id === Number(blueprintId)) ?? null,
    [blueprints, blueprintId],
  );

  const validationError = useMemo(() => {
    if (!mapConfig || !blueprint) return null;
    if (
      point[0] < 0 ||
      point[0] > mapConfig.worldSizeWidth ||
      point[1] < 0 ||
      point[1] > mapConfig.worldSizeHeight
    ) {
      return "Site is outside the map bounds.";
    }
    const zoneInputs: ZoneInput[] = zones.map((zone) => ({
      id: zone.id,
      name: zone.name,
      type: zone.type,
      resources: zone.resources.map((entry) => entry.id),
      points: zone.points,
    }));
    const nodeInputs: NodeInput[] = nodes.map((node) => ({
      id: node.id,
      resources: node.resources.map((entry) => entry.id),
      position: node.point,
    }));
    const structureInputs: StructureInput[] = structures.map((structure) => ({
      id: structure.id,
      type: structure.blueprintId ?? 0,
      coordinates: structure.point,
    }));
    const validation = validatePlacement({
      zones: zoneInputs,
      nodes: nodeInputs,
      structures: structureInputs,
      blueprintTerrain: blueprint.terrainType ?? "land",
      resourcesInRange: blueprint.resourcesInRange,
      structuresInRange: blueprint.structuresInRange,
      point,
    });
    return validation.allowed ? null : (validation.error ?? "Site is not valid.");
  }, [mapConfig, blueprint, point, zones, nodes, structures]);

  const reset = () => {
    setBlueprintId("");
    setName("");
    setFactionId("none");
  };

  const submit = async () => {
    if (!mapConfig || !blueprint) return;
    setSubmitting(true);
    try {
      const result = await placeStructure({
        mapId: mapConfig.id,
        blueprintId: blueprint.id,
        name,
        factionId: factionId === "none" ? null : Number(factionId),
        x: point[0],
        y: point[1],
      });
      if (result.success) {
        toast.success(`Placement of "${name}" submitted. Ship materials to start construction.`);
        reset();
        onOpenChange(false);
        onPlaced();
      } else {
        toast.error(result.error ?? "Placement failed.");
      }
    } finally {
      setSubmitting(false);
    }
  };

  const canSubmit = Boolean(blueprint) && name.trim().length > 0 && !validationError && !submitting;

  return (
    <Dialog
      open={open}
      onOpenChange={(nextOpen) => {
        if (!nextOpen) reset();
        onOpenChange(nextOpen);
      }}
    >
      <DialogContent className="sm:max-w-[440px]">
        <DialogHeader>
          <DialogTitle>Place structure</DialogTitle>
          <DialogDescription>
            Site at {Math.round(point[0])} m east, {Math.round(point[1])} m south
            {mapConfig ? ` on ${mapConfig.name}` : ""}.
          </DialogDescription>
        </DialogHeader>

        <div className="flex flex-col gap-3">
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="place-blueprint">Blueprint</Label>
            <Combobox
              id="place-blueprint"
              value={blueprintId}
              onValueChange={setBlueprintId}
              placeholder="Select blueprint"
              searchPlaceholder="Search blueprints..."
              emptyMessage="No blueprints available."
              options={blueprints.map((option) => ({
                value: String(option.id),
                label: option.name,
              }))}
            />
          </div>

          <div className="flex flex-col gap-1.5">
            <Label htmlFor="place-name">Display name</Label>
            <Input
              id="place-name"
              value={name}
              onChange={(event) => setName(event.target.value)}
              placeholder="e.g. FOB Wolfpack"
            />
          </div>

          <div className="flex flex-col gap-1.5">
            <Label htmlFor="place-faction">Faction (optional)</Label>
            <Combobox
              id="place-faction"
              value={factionId}
              onValueChange={setFactionId}
              searchPlaceholder="Search factions..."
              emptyMessage="No factions available."
              options={[
                { value: "none", label: "No faction" },
                ...factions.map((faction) => ({
                  value: String(faction.id),
                  label: faction.name,
                })),
              ]}
            />
          </div>

          {blueprint && (
            <div className="rounded-md border border-white/10 bg-black/30 p-3 text-xs text-white/70 flex flex-col gap-1">
              <div>
                Terrain: <span className="capitalize">{blueprint.terrainType ?? "land"}</span>
                {blueprint.constructionDurationMinutes != null && (
                  <>
                    {" \u00b7 "}Build time: {blueprint.constructionDurationMinutes} min
                  </>
                )}
              </div>
              {blueprint.materials.length > 0 && (
                <div>
                  Materials:{" "}
                  {blueprint.materials
                    .map((material) => `${material.resourceName} x${material.amount ?? 0}`)
                    .join(", ")}
                </div>
              )}
              {blueprint.requiredTech.length > 0 && (
                <div>Requires tech (informational): {blueprint.requiredTech.join(", ")}</div>
              )}
            </div>
          )}

          {validationError && (
            <p className="rounded-md border border-red-500/40 bg-red-950/60 p-2 text-xs text-red-200">
              {validationError}
            </p>
          )}
        </div>

        <DialogFooter>
          <Button variant="outline" size="sm" onClick={() => onOpenChange(false)}>
            Cancel
          </Button>
          <Button size="sm" onClick={() => void submit()} disabled={!canSubmit}>
            {submitting ? "Placing..." : "Place structure"}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}