"use client";

import { useEffect, useState, useTransition } from "react";
import { toast } from "sonner";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Collapsible,
  CollapsibleContent,
  CollapsibleTrigger,
} from "@/components/ui/collapsible";
import {
  createFridaySideOp,
  updateFridaySideOp,
  uploadSideOpModlist,
  type FridaySideOpInput,
} from "@/app/(frontend)/intelligence/missions/actions";
import { uploadUgcImage } from "./create";
import {
  SideOpNarrativeFields,
  type SideOpNarrative,
} from "@/components/frontend/intelligence/SideOpNarrativeFields";
import type { LexicalJson } from "./LexicalRichTextEditor";

const MISSION_TYPES = ["Zeus", "PvE", "PvP", "PvPvE", "Training", "Special"] as const;
const DEFAULT_BRIEFING_SECTIONS = ["Situation", "Mission", "Execution", "Signals"];

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

function hasLexicalText(value: unknown): boolean {
  if (!isRecord(value)) return false;
  if (typeof value.text === "string" && value.text.trim() !== "") return true;
  return Array.isArray(value.children) && value.children.some(hasLexicalText);
}

function isEmptyLexical(value: LexicalJson | null): boolean {
  return value === null || !hasLexicalText(value);
}

function defaultNarrative(): SideOpNarrative {
  return {
    briefing: DEFAULT_BRIEFING_SECTIONS.map((sectionName) => ({ sectionName, details: null })),
    missionObjectives: [],
    civilianPresence: "None",
    radioPlan: null,
    insertion: [],
    extraction: [],
    assetsAvailable: [],
  };
}

export interface SideOpDialogOption {
  id: number;
  name: string;
  disabled?: boolean;
}

export interface SideOpDialogInitial {
  missionId: number;
  name: string;
  codeName?: string | null;
  summary: string;
  coverImageId?: number | null;
  coverImageUrl?: string | null;
  mapId: number | null;
  missionType: string;
  startDateTime: string;
  estimatedDuration: number;
  maxPlayers: number;
  campaignId: number | null;
  requiredModsId?: number | null;
  briefing?: { sectionName: string; details: LexicalJson | null }[];
  missionObjectives?: {
    title: string;
    description: string;
    missionCritical: boolean;
    successOrFailConditions: string;
    redacted: boolean;
  }[];
  civilianPresence?: string;
  radioPlan?: LexicalJson | null;
  insertion?: string[];
  extraction?: string[];
  assetsAvailable?: {
    assetType: string;
    assetCount: string;
    doesRespawn: boolean;
    assetCallsign: string;
  }[];
}

interface CreateSideOpDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  maps: SideOpDialogOption[];
  campaigns: SideOpDialogOption[];
  modLists: SideOpDialogOption[];
  defaultStartDateTime?: string;
  initial?: SideOpDialogInitial;
  onSaved?: () => void;
  onModlistUploaded?: () => void;
}

export function CreateSideOpDialog({
  open,
  onOpenChange,
  maps,
  campaigns,
  modLists,
  defaultStartDateTime,
  initial,
  onSaved,
  onModlistUploaded,
}: CreateSideOpDialogProps) {
  const isEdit = initial !== undefined;
  const [name, setName] = useState(initial?.name ?? "");
  const [codeName, setCodeName] = useState(initial?.codeName ?? "");
  const [summary, setSummary] = useState(initial?.summary ?? "");
  const [mapId, setMapId] = useState<string>(initial?.mapId ? String(initial.mapId) : "");
  const [mapChoice, setMapChoice] = useState<string>(
    initial?.mapId ? String(initial.mapId) : "existing",
  );
  const [customMapName, setCustomMapName] = useState("");
  const [missionType, setMissionType] = useState<string>(initial?.missionType ?? "Zeus");
  const [requiredModsId, setRequiredModsId] = useState<string>(
    initial?.requiredModsId ? String(initial.requiredModsId) : "none",
  );
  const [modlistName, setModlistName] = useState("");
  const [modlistUploading, setModlistUploading] = useState(false);
  const [estimatedDuration, setEstimatedDuration] = useState(
    String(initial?.estimatedDuration ?? 240),
  );
  const [maxPlayers, setMaxPlayers] = useState(String(initial?.maxPlayers ?? 32));
  const [campaignChoice, setCampaignChoice] = useState<string>(
    initial?.campaignId ? String(initial.campaignId) : "none",
  );
  const [newCampaignName, setNewCampaignName] = useState("");
  const [narrative, setNarrative] = useState<SideOpNarrative>(defaultNarrative);
  const [narrativeOpen, setNarrativeOpen] = useState(false);
  const [coverImage, setCoverImage] = useState<{ id: number; url: string } | null>(null);
  const [coverImageUploading, setCoverImageUploading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [isPending, startTransition] = useTransition();

  useEffect(() => {
    if (open) {
      setError(null);
      setNarrativeOpen(false);
      if (initial) {
        setName(initial.name);
        setCodeName(initial.codeName ?? "");
        setSummary(initial.summary);
        setCoverImage(
          initial.coverImageId != null && initial.coverImageUrl
            ? { id: initial.coverImageId, url: initial.coverImageUrl }
            : null,
        );
        setMapId(initial.mapId ? String(initial.mapId) : "");
        setMapChoice(initial.mapId ? String(initial.mapId) : "custom");
        setCustomMapName("");
        setMissionType(initial.missionType);
        setRequiredModsId(initial.requiredModsId ? String(initial.requiredModsId) : "none");
        setModlistName("");
        setEstimatedDuration(String(initial.estimatedDuration));
        setMaxPlayers(String(initial.maxPlayers));
        setCampaignChoice(initial.campaignId ? String(initial.campaignId) : "none");
        setNarrative({
          briefing: initial.briefing ?? [],
          missionObjectives: initial.missionObjectives ?? [],
          civilianPresence: initial.civilianPresence ?? "None",
          radioPlan: initial.radioPlan ?? null,
          insertion: initial.insertion ?? [],
          extraction: initial.extraction ?? [],
          assetsAvailable: initial.assetsAvailable ?? [],
        });
      } else {
        setCoverImage(null);
        setNarrative(defaultNarrative());
      }
    }
  }, [open, initial]);

  function narrativeInput() {
    if (!narrativeOpen) {
      return {};
    }
    return {
      briefing: narrative.briefing
        .filter((e) => e.sectionName.trim() !== "" || !isEmptyLexical(e.details))
        .map((e) => ({ sectionName: e.sectionName.trim() || "Untitled", details: e.details })),
      missionObjectives: narrative.missionObjectives
        .filter((o) => o.title.trim() !== "")
        .map((o) => ({
          title: o.title.trim(),
          description: o.description || null,
          missionCritical: o.missionCritical,
          successOrFailConditions: o.successOrFailConditions || null,
          redacted: o.redacted,
        })),
      civilianPresence: narrative.civilianPresence as "None" | "Low" | "Medium" | "High",
      radioPlan: narrative.radioPlan,
      insertion: narrative.insertion as FridaySideOpInput["insertion"],
      extraction: narrative.extraction as FridaySideOpInput["extraction"],
      assetsAvailable: narrative.assetsAvailable.map((a) => ({
        assetType: a.assetType.trim(),
        assetCount: a.assetCount || null,
        doesRespawn: a.doesRespawn,
        assetCallsign: a.assetCallsign || null,
      })),
    };
  }

  function mapInput() {
    return mapChoice === "custom" && customMapName.trim() !== ""
      ? { customMapName }
      : mapId
        ? { mapId: Number(mapId), customMapName: null }
        : { customMapName: null };
  }

  function modsInput() {
    return requiredModsId === "none" ? { requiredModsId: null } : { requiredModsId: Number(requiredModsId) };
  }

  async function handleModlistUpload(file: File) {
    setModlistUploading(true);
    try {
      const formData = new FormData();
      formData.append("file", file);
      formData.append("name", modlistName.trim() || file.name.replace(/\.html?$/i, ""));
      const result = await uploadSideOpModlist(formData);
      if (!result.success || !result.data) {
        toast.error(result.error ?? "Failed to upload the mod list.");
        return;
      }
      setRequiredModsId(String(result.data.modlistId));
      toast.success(`Mod list "${result.data.modlistName}" uploaded.`);
      onModlistUploaded?.();
    } finally {
      setModlistUploading(false);
    }
  }

  async function handleCoverImageUpload(file: File) {
    setCoverImageUploading(true);
    try {
      const formData = new FormData();
      formData.append("file", file);
      const result = await uploadUgcImage(formData);
      if (!result.success || !result.data) {
        toast.error(result.error ?? "Failed to upload the image.");
        return;
      }
      setCoverImage({ id: result.data.id, url: result.data.url });
      toast.success("Cover image uploaded.");
    } finally {
      setCoverImageUploading(false);
    }
  }

  function handleSubmit() {
    setError(null);
    if (!name.trim() || !summary.trim()) {
      setError("Name and summary are required.");
      return;
    }
    if (mapChoice === "custom" && !customMapName.trim()) {
      setError("Please enter a name for the custom map.");
      return;
    }
    if (mapChoice !== "custom" && !mapId) {
      setError("Please choose a map.");
      return;
    }
    if (!isEdit && !defaultStartDateTime) {
      setError("Missing start date: schedule from a Friday on the calendar.");
      return;
    }
    const startDateIso = defaultStartDateTime ?? "";

    startTransition(async () => {
      if (isEdit) {
        const initialChoice = initial.campaignId ? String(initial.campaignId) : "none";
        const campaignChanged = campaignChoice !== initialChoice;
        const result = await updateFridaySideOp({
          missionId: initial.missionId,
          name,
          codeName: codeName.trim(),
          summary,
          ...(coverImage && coverImage.id !== (initial.coverImageId ?? null)
            ? { coverImageId: coverImage.id }
            : {}),
          ...mapInput(),
          missionType: missionType as FridaySideOpInput["missionType"],
          estimatedDuration: Number(estimatedDuration) || 240,
          maxPlayers: Number(maxPlayers) || 32,
          ...modsInput(),
          ...(campaignChanged
            ? campaignChoice === "none"
              ? { noCampaign: true }
              : campaignChoice === "new"
                ? { newCampaignName: newCampaignName || null }
                : { campaignId: Number(campaignChoice) }
            : {}),
          ...narrativeInput(),
        });
        if (!result.success) {
          setError(result.error ?? "Failed to update the side operation.");
          return;
        }
        toast.success("Side operation updated.");
        onOpenChange(false);
        onSaved?.();
        return;
      }

      const result = await createFridaySideOp({
        name,
        codeName: codeName.trim() || undefined,
        summary,
        ...(coverImage ? { coverImageId: coverImage.id } : {}),
        ...mapInput(),
        missionType: missionType as FridaySideOpInput["missionType"],
        startDateTime: startDateIso,
        estimatedDuration: Number(estimatedDuration) || 240,
        maxPlayers: Number(maxPlayers) || 32,
        ...modsInput(),
        campaignId: campaignChoice === "new" || campaignChoice === "none" ? null : Number(campaignChoice),
        newCampaignName: campaignChoice === "new" ? newCampaignName || null : null,
        noCampaign: campaignChoice === "none",
        ...narrativeInput(),
      });
      if (!result.success) {
        setError(result.error ?? "Failed to schedule the side operation.");
        return;
      }
      toast.success("Side operation scheduled.");
      onOpenChange(false);
      onSaved?.();
    });
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-h-[85vh] overflow-y-auto sm:max-w-2xl">
        <DialogHeader>
          <DialogTitle>{isEdit ? "Edit Side Operation" : "Schedule Side Operation"}</DialogTitle>
          <DialogDescription>
            {isEdit
              ? "Update the details of this Friday side operation."
              : "Player-run Friday side operations include Discord roll-call and RSVP automatically."}
          </DialogDescription>
        </DialogHeader>

        <div className="grid gap-4 py-2">
          <div className="grid gap-1.5">
            <Label htmlFor="sideop-name">Mission name</Label>
            <Input
              id="sideop-name"
              value={name}
              onChange={(e) => setName(e.target.value)}
              placeholder="Operation Broken Arrow"
            />
          </div>
          <div className="grid gap-1.5">
            <Label htmlFor="sideop-code">
              Code name <span className="text-xs text-muted-foreground">(optional)</span>
            </Label>
            <Input
              id="sideop-code"
              value={codeName}
              onChange={(e) => setCodeName(e.target.value)}
              placeholder="OP:BRKARW"
            />
          </div>
          <div className="grid gap-1.5">
            <Label htmlFor="sideop-summary">Summary</Label>
            <Textarea
              id="sideop-summary"
              value={summary}
              onChange={(e) => setSummary(e.target.value)}
              placeholder="What is this operation about?"
              rows={3}
            />
          </div>
          <div className="grid gap-1.5">
            <Label htmlFor="sideop-cover">Cover image</Label>
            <Input
              id="sideop-cover"
              type="file"
              accept="image/*"
              disabled={coverImageUploading}
              onChange={(e) => {
                const file = e.target.files?.[0];
                if (file) void handleCoverImageUpload(file);
                e.target.value = "";
              }}
            />
            {coverImage && (
              <img
                src={coverImage.url}
                alt="Mission cover preview"
                className="h-28 w-full rounded-md object-cover"
              />
            )}
            <p className="text-xs text-muted-foreground">
              Optional background image for the mission page header. 16:9 or wider works best, 8 MB
              max.
            </p>
          </div>
          <div className="grid grid-cols-2 gap-3">
            <div className="grid gap-1.5">
              <Label>Map</Label>
              <Select
                value={mapChoice}
                onValueChange={(v) => {
                  setMapChoice(v);
                  if (v !== "custom" && v !== "") setMapId(v);
                }}
              >
                <SelectTrigger className="w-full">
                  <SelectValue placeholder="Choose a map" />
                </SelectTrigger>
                <SelectContent>
                  {maps.map((m) => (
                    <SelectItem key={m.id} value={String(m.id)}>
                      {m.name}
                    </SelectItem>
                  ))}
                  <SelectItem value="custom">+ Custom map…</SelectItem>
                </SelectContent>
              </Select>
            </div>
            <div className="grid gap-1.5">
              <Label>Mission type</Label>
              <Select value={missionType} onValueChange={setMissionType}>
                <SelectTrigger className="w-full">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  {MISSION_TYPES.map((t) => (
                    <SelectItem key={t} value={t}>
                      {t}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
          </div>
          <div className="grid grid-cols-2 gap-3">
            <div className="grid gap-1.5">
              <Label htmlFor="sideop-duration">Est. duration (minutes)</Label>
              <Input
                id="sideop-duration"
                type="number"
                min={15}
                step={15}
                value={estimatedDuration}
                onChange={(e) => setEstimatedDuration(e.target.value)}
              />
            </div>
            <div className="grid gap-1.5">
              <Label htmlFor="sideop-players">Max players</Label>
              <Input
                id="sideop-players"
                type="number"
                min={2}
                value={maxPlayers}
                onChange={(e) => setMaxPlayers(e.target.value)}
              />
            </div>
            <div className="grid gap-1.5">
              <Label>Campaign</Label>
              <Select value={campaignChoice} onValueChange={setCampaignChoice}>
                <SelectTrigger className="w-full">
                  <SelectValue placeholder="Choose a campaign" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="none">No campaign (one-off op)</SelectItem>
                  {campaigns.map((c) => (
                    <SelectItem key={c.id} value={String(c.id)} disabled={c.disabled}>
                      {c.name}
                    </SelectItem>
                  ))}
                  <SelectItem value="new">+ New campaign…</SelectItem>
                </SelectContent>
              </Select>
            </div>
          </div>
          {mapChoice === "custom" && (
            <div className="grid gap-1.5">
              <Label htmlFor="sideop-custom-map">Custom map name</Label>
              <Input
                id="sideop-custom-map"
                value={customMapName}
                onChange={(e) => setCustomMapName(e.target.value)}
                placeholder="e.g. Altis Special Branch Edit"
              />
            </div>
          )}
          {campaignChoice === "new" && (
            <div className="grid gap-1.5">
              <Label htmlFor="sideop-campaign">New campaign name</Label>
              <Input
                id="sideop-campaign"
                value={newCampaignName}
                onChange={(e) => setNewCampaignName(e.target.value)}
                placeholder="Leave empty to use your personal side ops campaign"
              />
            </div>
          )}

          <div className="grid gap-1.5">
            <Label>Mod list</Label>
            <Select value={requiredModsId} onValueChange={setRequiredModsId}>
              <SelectTrigger className="w-full">
                <SelectValue placeholder="No mod list (vanilla)" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="none">No mod list (vanilla)</SelectItem>
                {modLists.map((l) => (
                  <SelectItem key={l.id} value={String(l.id)}>
                    {l.name}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
            <Input
              type="file"
              accept=".html,.htm,.txt,text/html,text/plain"
              disabled={modlistUploading}
              onChange={(e) => {
                const file = e.target.files?.[0];
                if (file) void handleModlistUpload(file);
                e.target.value = "";
              }}
            />
            <p className="text-xs text-muted-foreground">
              Upload the mod list file exported from the Arma 3 launcher (.html) or a .txt mod
              list, or pick an existing one.
            </p>
          </div>

          <Collapsible open={narrativeOpen} onOpenChange={setNarrativeOpen}>
            <CollapsibleTrigger asChild>
              <Button type="button" variant="outline" className="w-full justify-between">
                Narrative &amp; logistics (optional)
                <span className="text-xs text-muted-foreground">
                  {narrativeOpen ? "Hide" : "Show"}
                </span>
              </Button>
            </CollapsibleTrigger>
            <CollapsibleContent className="pt-3">
              <SideOpNarrativeFields value={narrative} onChange={setNarrative} />
            </CollapsibleContent>
          </Collapsible>

          {error && <p className="text-sm text-destructive">{error}</p>}
        </div>

        <DialogFooter>
          <Button variant="outline" onClick={() => onOpenChange(false)} disabled={isPending}>
            Cancel
          </Button>
          <Button onClick={handleSubmit} disabled={isPending}>
            {isPending ? "Saving…" : isEdit ? "Save changes" : "Schedule"}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}