'use client';

import { useId, useState } from 'react';
import type { Action, GameView } from '@/game/engine';
import {
  planetologistLeader,
  planetologistMovementModeSupported,
  selectedOriginElites,
  planetologistGatherAdvisorEntry,
  type PlanetologistMoveMode,
} from '@/game/planetologist-movement';
import { botGroundMoveAllowed } from '@/game/bot-mobility';
import { isAdvisor } from '@/game/advisors';
import { quoteAdvisorGatherMatching, AdvisorGatherMatchingError } from '@/game/advisor-gather-matching';
import {
  gameTerritories,
  location,
  splitLocation,
  territory,
} from '@/game/board';
import { Button } from './ui/button';
import { Input } from './ui/input';

type Counts = Record<string, number>;

export function planetologistMoveDraft(
  game: GameView,
  mode: PlanetologistMoveMode,
  destination: string,
  sector: number,
  forces: Counts,
  elites: Counts,
): { action: Action | null; blocked: string | null } {
  const me = game.players.find((player) => player.id === game.me);
  if (!me || !planetologistLeader(game, me.id))
    return {
      action: null,
      blocked: 'A living, uncaptured Planetologist is required.',
    };
  if (
    !planetologistMovementModeSupported(game)
  )
    return {
      action: null,
      blocked:
        'Planetologist movement with expansion factions awaits its movement audit.',
    };
  const selected = Object.entries(forces).filter(([, count]) => count > 0);
  for (const [from, count] of selected) {
    const owned = me.forces[from] ?? 0;
    if (!Number.isSafeInteger(count) || count < 1 || count > owned)
      return { action: null, blocked: 'Choose available whole force counts.' };
    const elite = elites[from] ?? 0;
    const ownedElite = me.elites?.forces[from] ?? 0;
    const minimumElite = Math.max(0, count - (owned - ownedElite));
    if (
      !Number.isSafeInteger(elite) ||
      elite < minimumElite ||
      elite > Math.min(count, ownedElite)
    )
      return {
        action: null,
        blocked: 'Choose an available normal and elite mix for every source.',
      };
  }
  const origins = new Set(
    selected.map(([from]) => splitLocation(from).territory),
  );
  if (
    (mode === 'range' && origins.size !== 1) ||
    (mode === 'gather' && origins.size !== 2)
  )
    return {
      action: null,
      blocked:
        mode === 'range'
          ? 'Select forces from one territory.'
          : 'Select forces from exactly two different territories.',
    };
  const entry = planetologistGatherAdvisorEntry(game, me, [...origins], destination);
  if (entry.blocked) return { action: null, blocked: entry.blocked };
  const target = location(destination, sector);
  if (
    selected.some(
      ([from]) =>
        !botGroundMoveAllowed(game, me, from, target,
          selectedOriginElites(selected, elites, splitLocation(from).territory), mode),
    )
  )
    return {
      action: null,
      blocked:
        mode === 'range'
          ? 'The selected route is beyond the boosted range or is blocked.'
          : 'Each selected source must reach the destination using its normal range.',
    };
  if(mode==='gather'){
    try{
      quoteAdvisorGatherMatching(game,{owner:me.id,move:me.moved??0,destination,sector,
        advisors:isAdvisor(me,destination),group:Object.fromEntries(selected)});
    }catch(error){if(!(error instanceof AdvisorGatherMatchingError))throw error;return {action:null,blocked:error.message};}
  }
  return {
    action: {
      type: 'move',
      planetologist: mode,
      ...(entry.requiresFlip ? { fighters: true } : {}),
      forces: Object.fromEntries(selected),
      ...(me.elites
        ? {
            eliteForces: Object.fromEntries(
              selected.map(([from]) => [from, elites[from] ?? 0]),
            ),
          }
        : {}),
      territory: destination,
      sector,
    },
    blocked: null,
  };
}

export function PlanetologistMovement({
  game,
  act,
  busy,
  destination,
  sector,
  unavailableReason,
}: {
  game: GameView;
  act: (action: Action) => void;
  busy: boolean;
  destination: string;
  sector: number;
  unavailableReason?: string | null;
}) {
  const id = useId();
  const [mode, setMode] = useState<PlanetologistMoveMode>('range');
  const [forces, setForces] = useState<Counts>({});
  const [elites, setElites] = useState<Counts>({});
  const me = game.players.find((player) => player.id === game.me);
  const leader = me && planetologistLeader(game, me.id);
  if (!me || !leader) return null;
  const sources = Object.entries(me.forces).filter(([, count]) => count > 0);
  const draft = planetologistMoveDraft(
    game,
    mode,
    destination,
    sector,
    forces,
    elites,
  );
  const blocked =
    unavailableReason ??
    (game.phase !== 5 || game.active !== me.id
      ? 'Planetologist movement is available only during your movement turn.'
      : game.ornithopter?.active
        ? 'Finish the current Ornithopter movement first.'
        : game.truthtrance || game.nexusTraitors?.pending
          ? 'Resolve the current private response first.'
          : me.autopilot || game.automaticContinuationPending
            ? 'Wait for the current automatic action to finish.'
            : draft.blocked);
  const leaderName =
    game.allLeaders.find((candidate) => candidate.id === leader)?.name ??
    leader;
  return (
    <section
      className="my-4 flex min-w-0 flex-col gap-3"
      aria-labelledby={`${id}-heading`}
    >
      <h3 id={`${id}-heading`}>Planetologist movement</h3>
      <p>
        {leaderName} may add one territory to one movement, up to three, or
        gather forces from exactly two territories into the selected
        destination.
      </p>
      {game.advanced&&me.faction==='beneGesserit'&&mode==='gather'&&(
        <p className="notice">When joining your residents, each incoming origin that changes type has its own matching response. Both groups wait for every required allowance. Prevention leaves the movement unused and keeps both groups in place.</p>
      )}
      <label htmlFor={`${id}-mode`}>Movement mode</label>
      <select
        id={`${id}-mode`}
        value={mode}
        disabled={busy}
        onChange={(event) =>
          setMode(event.target.value as PlanetologistMoveMode)
        }
      >
        <option value="range">One territory farther, maximum three</option>
        <option value="gather">Gather from two territories</option>
      </select>
      <p className="fine">
        Destination: {territory(destination).name}, sector {sector}. Select the
        physical forces to move below.
      </p>
      {draft.action?.fighters === true && (
        <p className="notice">
          Provisional mixed-gather policy: both groups arrive as fighters. The
          advisor flip is declared before either group moves. If canceled, both
          groups stay in place and no movement is spent; flipping remains blocked
          for that movement opportunity.
        </p>
      )}
      {me.faction === 'ixians' && (
        <p className="fine">
          Each origin uses its own selected cyborgs for movement range. Cyborgs
          from one territory cannot carry suboids from the other territory farther.
        </p>
      )}
      {sources.length ? (
        sources.map(([from, owned]) => {
          const source = splitLocation(from);
          const sourceName =
            gameTerritories(game).find(
              (candidate) => candidate.id === source.territory,
            )?.name ?? source.territory;
          const selected = forces[from] ?? 0;
          const ownedElite = me.elites?.forces[from] ?? 0;
          const minimumElite = Math.max(0, selected - (owned - ownedElite));
          return (
            <div className="grid gap-2" key={from}>
              <label htmlFor={`${id}-${from}-forces`}>
                {sourceName}, sector {source.sector} · {owned} forces
                <Input
                  id={`${id}-${from}-forces`}
                  type="number"
                  min={0}
                  max={owned}
                  value={selected}
                  disabled={busy || source.sector === game.storm}
                  onChange={(event) =>
                    setForces({ ...forces, [from]: Number(event.target.value) })
                  }
                />
              </label>
              {me.elites && (
                <label htmlFor={`${id}-${from}-elites`}>
                  Elite from this group · {ownedElite} available
                  <Input
                    id={`${id}-${from}-elites`}
                    type="number"
                    min={minimumElite}
                    max={Math.min(selected, ownedElite)}
                    value={elites[from] ?? 0}
                    disabled={busy || selected === 0}
                    onChange={(event) =>
                      setElites({
                        ...elites,
                        [from]: Number(event.target.value),
                      })
                    }
                  />
                </label>
              )}
            </div>
          );
        })
      ) : (
        <p className="fine">No board forces are available to move.</p>
      )}
      {blocked && (
        <output className="notice" id={`${id}-reason`}>
          {blocked}
        </output>
      )}
      <Button
        className="min-h-11 whitespace-normal motion-reduce:transition-none"
        disabled={busy || !!blocked || !draft.action}
        aria-describedby={blocked ? `${id}-reason` : undefined}
        onClick={() => {
          if (!busy && !blocked && draft.action) act(draft.action);
        }}
      >
        Move with Planetologist
      </Button>
      <p className="fine">
        This does not combine with a No-Field or either Ornithopter movement.
        Normal movement and arrival rules still apply.
      </p>
    </section>
  );
}