import { loggedInUser } from "#app/account";
import { BattleType } from "#enums/battle-type";
import { fetchDailyRunSeed, getDailyRunStarters } from "#app/data/daily-run";
import { Gender } from "#app/data/gender";
import { getBiomeKey } from "#app/field/arena";
import { GameMode, getGameMode } from "#app/game-mode";
import { GameModes } from "#enums/game-modes";
import type { Modifier } from "#app/modifier/modifier";
import {
  getDailyRunStarterModifiers,
  ModifierPoolType,
  modifierTypes,
  regenerateModifierPoolThresholds,
} from "#app/modifier/modifier-type";
import { Phase } from "#app/phase";
import type { SessionSaveData } from "#app/system/game-data";
import { Unlockables } from "#app/system/unlockables";
import { vouchers } from "#app/system/voucher";
import type { OptionSelectConfig, OptionSelectItem } from "#app/ui/abstact-option-select-ui-handler";
import { SaveSlotUiMode } from "#app/ui/save-slot-select-ui-handler";
import { UiMode } from "#enums/ui-mode";
import { isLocal, isLocalServerConnected, isNullOrUndefined } from "#app/utils/common";
import i18next from "i18next";
import { globalScene } from "#app/global-scene";
import Overrides from "#app/overrides";

export class TitlePhase extends Phase {
  public readonly phaseName = "TitlePhase";
  private loaded = false;
  private lastSessionData: SessionSaveData;
  public gameMode: GameModes;

  start(): void {
    super.start();

    globalScene.ui.clearText();
    globalScene.ui.fadeIn(250);

    globalScene.playBgm("title", true);

    globalScene.gameData
      .getSession(loggedInUser?.lastSessionSlot ?? -1)
      .then(sessionData => {
        if (sessionData) {
          this.lastSessionData = sessionData;
          const biomeKey = getBiomeKey(sessionData.arena.biome);
          const bgTexture = `${biomeKey}_bg`;
          globalScene.arenaBg.setTexture(bgTexture);
        }
        this.showOptions();
      })
      .catch(err => {
        console.error(err);
        this.showOptions();
      });
  }

  showOptions(): void {
    const options: OptionSelectItem[] = [];
    if (loggedInUser && loggedInUser.lastSessionSlot > -1) {
      options.push({
        label: i18next.t("continue", { ns: "menu" }),
        handler: () => {
          this.loadSaveSlot(this.lastSessionData || !loggedInUser ? -1 : loggedInUser.lastSessionSlot);
          return true;
        },
      });
    }
    options.push(
      {
        label: i18next.t("menu:newGame"),
        handler: () => {
          const setModeAndEnd = (gameMode: GameModes) => {
            this.gameMode = gameMode;
            globalScene.ui.setMode(UiMode.MESSAGE);
            globalScene.ui.clearText();
            this.end();
          };
          const { gameData } = globalScene;
          const options: OptionSelectItem[] = [];
          options.push({
            label: GameMode.getModeName(GameModes.CLASSIC),
            handler: () => {
              setModeAndEnd(GameModes.CLASSIC);
              return true;
            },
          });
          options.push({
            label: i18next.t("menu:dailyRun"),
            handler: () => {
              this.initDailyRun();
              return true;
            },
          });
          if (gameData.isUnlocked(Unlockables.ENDLESS_MODE)) {
            options.push({
              label: GameMode.getModeName(GameModes.CHALLENGE),
              handler: () => {
                setModeAndEnd(GameModes.CHALLENGE);
                return true;
              },
            });
            options.push({
              label: GameMode.getModeName(GameModes.ENDLESS),
              handler: () => {
                setModeAndEnd(GameModes.ENDLESS);
                return true;
              },
            });
            if (gameData.isUnlocked(Unlockables.SPLICED_ENDLESS_MODE)) {
              options.push({
                label: GameMode.getModeName(GameModes.SPLICED_ENDLESS),
                handler: () => {
                  setModeAndEnd(GameModes.SPLICED_ENDLESS);
                  return true;
                },
              });
            }
          }
          options.push({
            label: i18next.t("menu:cancel"),
            handler: () => {
              globalScene.phaseManager.clearPhaseQueue();
              globalScene.phaseManager.pushNew("TitlePhase");
              super.end();
              return true;
            },
          });
          globalScene.ui.showText(i18next.t("menu:selectGameMode"), null, () =>
            globalScene.ui.setOverlayMode(UiMode.OPTION_SELECT, {
              options: options,
            }),
          );
          return true;
        },
      },
      {
        label: i18next.t("menu:loadGame"),
        handler: () => {
          globalScene.ui.setOverlayMode(UiMode.SAVE_SLOT, SaveSlotUiMode.LOAD, (slotId: number) => {
            if (slotId === -1) {
              return this.showOptions();
            }
            this.loadSaveSlot(slotId);
          });
          return true;
        },
      },
      {
        label: i18next.t("menu:runHistory"),
        handler: () => {
          globalScene.ui.setOverlayMode(UiMode.RUN_HISTORY);
          return true;
        },
        keepOpen: true,
      },
      {
        label: i18next.t("menu:settings"),
        handler: () => {
          globalScene.ui.setOverlayMode(UiMode.SETTINGS);
          return true;
        },
        keepOpen: true,
      },
    );
    const config: OptionSelectConfig = {
      options: options,
      noCancel: true,
      yOffset: 47,
    };
    globalScene.ui.setMode(UiMode.TITLE, config);
  }

  loadSaveSlot(slotId: number): void {
    globalScene.sessionSlotId = slotId > -1 || !loggedInUser ? slotId : loggedInUser.lastSessionSlot;
    globalScene.ui.setMode(UiMode.MESSAGE);
    globalScene.ui.resetModeChain();
    globalScene.gameData
      .loadSession(slotId, slotId === -1 ? this.lastSessionData : undefined)
      .then((success: boolean) => {
        if (success) {
          this.loaded = true;
          globalScene.ui.showText(i18next.t("menu:sessionSuccess"), null, () => this.end());
        } else {
          this.end();
        }
      })
      .catch(err => {
        console.error(err);
        globalScene.ui.showText(i18next.t("menu:failedToLoadSession"), null);
      });
  }

  initDailyRun(): void {
    globalScene.ui.clearText();
    globalScene.ui.setMode(UiMode.SAVE_SLOT, SaveSlotUiMode.SAVE, (slotId: number) => {
      globalScene.phaseManager.clearPhaseQueue();
      if (slotId === -1) {
        globalScene.phaseManager.pushNew("TitlePhase");
        return super.end();
      }
      globalScene.sessionSlotId = slotId;

      const generateDaily = (seed: string) => {
        globalScene.gameMode = getGameMode(GameModes.DAILY);
        // Daily runs don't support all challenges yet (starter select restrictions aren't considered)
        globalScene.eventManager.startEventChallenges();

        globalScene.setSeed(seed);
        globalScene.resetSeed(0);

        globalScene.money = globalScene.gameMode.getStartingMoney();

        const starters = getDailyRunStarters(seed);
        const startingLevel = globalScene.gameMode.getStartingLevel();

        const party = globalScene.getPlayerParty();
        const loadPokemonAssets: Promise<void>[] = [];
        for (const starter of starters) {
          const starterProps = globalScene.gameData.getSpeciesDexAttrProps(starter.species, starter.dexAttr);
          const starterFormIndex = Math.min(starterProps.formIndex, Math.max(starter.species.forms.length - 1, 0));
          const starterGender =
            starter.species.malePercent !== null
              ? !starterProps.female
                ? Gender.MALE
                : Gender.FEMALE
              : Gender.GENDERLESS;
          const starterPokemon = globalScene.addPlayerPokemon(
            starter.species,
            startingLevel,
            starter.abilityIndex,
            starterFormIndex,
            starterGender,
            starterProps.shiny,
            starterProps.variant,
            undefined,
            starter.nature,
          );
          starterPokemon.setVisible(false);
          party.push(starterPokemon);
          loadPokemonAssets.push(starterPokemon.loadAssets());
        }

        regenerateModifierPoolThresholds(party, ModifierPoolType.DAILY_STARTER);

        const modifiers: Modifier[] = Array(3)
          .fill(null)
          .map(() => modifierTypes.EXP_SHARE().withIdFromFunc(modifierTypes.EXP_SHARE).newModifier())
          .concat(
            Array(3)
              .fill(null)
              .map(() => modifierTypes.GOLDEN_EXP_CHARM().withIdFromFunc(modifierTypes.GOLDEN_EXP_CHARM).newModifier()),
          )
          .concat([modifierTypes.MAP().withIdFromFunc(modifierTypes.MAP).newModifier()])
          .concat(getDailyRunStarterModifiers(party))
          .filter(m => m !== null);

        for (const m of modifiers) {
          globalScene.addModifier(m, true, false, false, true);
        }
        globalScene.updateModifiers(true, true);

        Promise.all(loadPokemonAssets).then(() => {
          globalScene.time.delayedCall(500, () => globalScene.playBgm());
          globalScene.gameData.gameStats.dailyRunSessionsPlayed++;
          globalScene.newArena(globalScene.gameMode.getStartingBiome());
          globalScene.newBattle();
          globalScene.arena.init();
          globalScene.sessionPlayTime = 0;
          globalScene.lastSavePlayTime = 0;
          this.end();
        });
      };

      // If Online, calls seed fetch from db to generate daily run. If Offline, generates a daily run based on current date.
      if (!isLocal || isLocalServerConnected) {
        fetchDailyRunSeed()
          .then(seed => {
            if (seed) {
              generateDaily(seed);
            } else {
              throw new Error("Daily run seed is null!");
            }
          })
          .catch(err => {
            console.error("Failed to load daily run:\n", err);
          });
      } else {
        let seed: string = btoa(new Date().toISOString().substring(0, 10));
        if (!isNullOrUndefined(Overrides.DAILY_RUN_SEED_OVERRIDE)) {
          seed = Overrides.DAILY_RUN_SEED_OVERRIDE;
        }
        generateDaily(seed);
      }
    });
  }

  end(): void {
    if (!this.loaded && !globalScene.gameMode.isDaily) {
      globalScene.arena.preloadBgm();
      globalScene.gameMode = getGameMode(this.gameMode);
      if (this.gameMode === GameModes.CHALLENGE) {
        globalScene.phaseManager.pushNew("SelectChallengePhase");
      } else {
        globalScene.phaseManager.pushNew("SelectStarterPhase");
      }
      globalScene.newArena(globalScene.gameMode.getStartingBiome());
    } else {
      globalScene.playBgm();
    }

    globalScene.phaseManager.pushNew("EncounterPhase", this.loaded);

    if (this.loaded) {
      const availablePartyMembers = globalScene.getPokemonAllowedInBattle().length;

      globalScene.phaseManager.pushNew("SummonPhase", 0, true, true);
      if (globalScene.currentBattle.double && availablePartyMembers > 1) {
        globalScene.phaseManager.pushNew("SummonPhase", 1, true, true);
      }

      if (
        globalScene.currentBattle.battleType !== BattleType.TRAINER &&
        (globalScene.currentBattle.waveIndex > 1 || !globalScene.gameMode.isDaily)
      ) {
        const minPartySize = globalScene.currentBattle.double ? 2 : 1;
        if (availablePartyMembers > minPartySize) {
          globalScene.phaseManager.pushNew("CheckSwitchPhase", 0, globalScene.currentBattle.double);
          if (globalScene.currentBattle.double) {
            globalScene.phaseManager.pushNew("CheckSwitchPhase", 1, globalScene.currentBattle.double);
          }
        }
      }
    }

    for (const achv of Object.keys(globalScene.gameData.achvUnlocks)) {
      if (vouchers.hasOwnProperty(achv) && achv !== "CLASSIC_VICTORY") {
        globalScene.validateVoucher(vouchers[achv]);
      }
    }

    super.end();
  }
}