import Logger from "js-logger";
import { autorun, IReactionDisposer, observable } from "mobx";
import { HuntMethod, NpcType, Server, SimpleQuest } from "../domain";
import { QuestDto } from "../dto";
import { Loadable } from "../Loadable";
import { ServerMap } from "./ServerMap";

const logger = Logger.get("stores/HuntMethodStore");

class HuntMethodStore {
    @observable methods: ServerMap<Loadable<HuntMethod[]>> = new ServerMap(
        server => new Loadable([], () => this.load_hunt_methods(server))
    );

    private storage_disposer?: IReactionDisposer;

    private async load_hunt_methods(server: Server): Promise<HuntMethod[]> {
        const response = await fetch(
            `${process.env.PUBLIC_URL}/quests.${Server[server].toLowerCase()}.json`
        );
        const quests = (await response.json()) as QuestDto[];
        const methods = new Array<HuntMethod>();

        for (const quest of quests) {
            let total_count = 0;
            const enemy_counts = new Map<NpcType, number>();

            for (const [code, count] of Object.entries(quest.enemyCounts)) {
                const npc_type = NpcType.by_code(code);

                if (!npc_type) {
                    logger.error(`No NpcType found for code ${code}.`);
                } else {
                    enemy_counts.set(npc_type, count);
                    total_count += count;
                }
            }

            // Filter out some quests.
            /* eslint-disable no-fallthrough */
            switch (quest.id) {
                // The following quests are left out because their enemies don't drop anything.
                case 31: // Black Paper's Dangerous Deal
                case 34: // Black Paper's Dangerous Deal 2
                case 1305: // Maximum Attack S (Ep. 1)
                case 1306: // Maximum Attack S (Ep. 2)
                case 1307: // Maximum Attack S (Ep. 4)
                case 313: // Beyond the Horizon

                // MAXIMUM ATTACK 3 Ver2 is filtered out because its actual enemy count depends on the path taken.
                // TODO: generate a method per path.
                case 314:
                    continue;
            }

            methods.push(
                new HuntMethod(
                    `q${quest.id}`,
                    quest.name,
                    new SimpleQuest(quest.id, quest.name, quest.episode, enemy_counts),
                    /^\d-\d.*/.test(quest.name) ? 0.75 : total_count > 400 ? 0.75 : 0.5
                )
            );
        }

        this.load_from_local_storage(methods, server);
        return methods;
    }

    private load_from_local_storage = (methods: HuntMethod[], server: Server) => {
        try {
            const method_user_times_json = localStorage.getItem(
                `HuntMethodStore.methodUserTimes.${Server[server]}`
            );

            if (method_user_times_json) {
                const user_times: StoredUserTimes = JSON.parse(method_user_times_json);

                for (const method of methods) {
                    method.user_time = user_times[method.id];
                }
            }

            if (this.storage_disposer) {
                this.storage_disposer();
            }

            this.storage_disposer = autorun(() => this.store_in_local_storage(methods, server));
        } catch (e) {
            logger.error(e);
        }
    };

    private store_in_local_storage = (methods: HuntMethod[], server: Server) => {
        try {
            const user_times: StoredUserTimes = {};

            for (const method of methods) {
                if (method.user_time != undefined) {
                    user_times[method.id] = method.user_time;
                }
            }

            localStorage.setItem(
                `HuntMethodStore.methodUserTimes.${Server[server]}`,
                JSON.stringify(user_times)
            );
        } catch (e) {
            logger.error(e);
        }
    };
}

type StoredUserTimes = { [method_id: string]: number };

export const hunt_method_store = new HuntMethodStore();