import { ItemSheetKH } from "./items/item-sheet.js";
import { ItemKH } from "./items/item.js";
import KHHooks from "./kh-hooks.js";
import { ActorKH } from "./actors/actor.js";
import { ActorSheetKH } from "./actors/actor-sheet.js";
import { KH } from "./kh-config.js";
import * as migrations from "./helpers/migration-helper.js";

Hooks.once("init", () => {
    CONFIG.Combat.initiative = { formula: "(@combat.init)d6kh2", decimals: 0 };

    CONFIG.Actor.documentClass = ActorKH;
    CONFIG.Item.documentClass = ItemKH;

    // Give global access to FFG config.
    CONFIG.KH = KH;

    game.settings.register("kopparhavet", "worldSchemaVersion", {
        name: "World Version",
        hint: "Used to automatically upgrade worlds data when the system is upgraded.",
        scope: "world",
        config: true,
        default: 0,
        type: String,
    });
    game.settings.register("kopparhavet", "gameSystem", {
        name: "Game System",
        hint: "Select what game system is being used..",
        scope: "world",
        config: true,
        default: "kopparhavet",
        choices: {
            "kopparhavet": "Kopparhavets Hjältar",
            "hjaltarnas-tid": "Hjältarnas Tid"
        },
        type: String,
        onChange: (rule) => {
            window.location.reload();
        },
    });
    game.settings.register("kopparhavet", "applySpellCost", {
        name: "Apply Spell Cost",
        hint: "Automatically add spell cost to the character when rolled.",
        scope: "world",
        config: true,
        default: false,
        type: Boolean,
    });

    //registerFonts();
    registerSheets();

    if(game.settings.get("kopparhavet", "gameSystem") === "hjaltarnas-tid") {
        preloadHandlebarsTemplatesHT();
    } else {
        preloadHandlebarsTemplates();
    }

    registerHandlebarsHelpers();
});

Hooks.once("ready", () => {
    migrateWorld();
});

/* POPULATE CHARACTER WITH DEFAULT SKILLS */
Hooks.on("createActor", async (actor, options, userId) => KHHooks.onCreateActor(actor, options, userId));

function registerSheets() {
    // Register sheet application classes
    Actors.unregisterSheet("core", ActorSheet);
    Actors.registerSheet("kopparhavet", ActorSheetKH, { types: ["character"], makeDefault: true });
    Actors.registerSheet("kopparhavet", ActorSheetKH, { types: ["adversary"], makeDefault: true });
    Actors.registerSheet("kopparhavet", ActorSheetKH, { types: ["ship"], makeDefault: true });

    Items.unregisterSheet("core", ItemSheet);
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["weapon"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["armor"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["gear"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["skill"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["spell"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["talent"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["adversaryAttack"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["shiptalent"], makeDefault: true });
    Items.registerSheet("kopparhavet", ItemSheetKH, { types: ["shipweapon"], makeDefault: true });
}

function preloadHandlebarsTemplates() {
    const templatePaths = [
        "systems/kopparhavet/templates/chat/item-card.html",
        "systems/kopparhavet/templates/actors/adversary-sheet.html",
        "systems/kopparhavet/templates/actors/character-sheet.html",
        "systems/kopparhavet/templates/actors/ship-sheet.html",
        "systems/kopparhavet/templates/dice/roll.html",
        "systems/kopparhavet/templates/items/adversaryAttack-sheet.html",
        "systems/kopparhavet/templates/items/armor-sheet.html",
        "systems/kopparhavet/templates/items/gear-sheet.html",
        "systems/kopparhavet/templates/items/skill-sheet.html",
        "systems/kopparhavet/templates/items/spell-sheet.html",
        "systems/kopparhavet/templates/items/talent-sheet.html",
        "systems/kopparhavet/templates/items/weapon-sheet.html",
        "systems/kopparhavet/templates/items/shipweapon-sheet.html",
        "systems/kopparhavet/templates/items/shiptalent-sheet.html",
        "systems/kopparhavet/templates/parts/actor/main.html",
        "systems/kopparhavet/templates/parts/actor/bio.html",
        "systems/kopparhavet/templates/parts/actor/combat.html",
        "systems/kopparhavet/templates/parts/actor/gear.html",
        "systems/kopparhavet/templates/parts/actor/skills.html",
        "systems/kopparhavet/templates/parts/actor/talent.html",
        "systems/kopparhavet/templates/parts/shared/modifications.html",
        "systems/kopparhavet/templates/parts/actor/ship-main.html",
        "systems/kopparhavet/templates/parts/actor/ship-combat.html",
    ];
    return loadTemplates(templatePaths);
}

function preloadHandlebarsTemplatesHT() {
    const templatePaths = [
        "systems/kopparhavet/templates/chat/item-card.html",
        "systems/kopparhavet/templates/actors/ht-adversary-sheet.html",
        "systems/kopparhavet/templates/actors/ht-character-sheet.html",
        "systems/kopparhavet/templates/actors/ht-ship-sheet.html",
        "systems/kopparhavet/templates/dice/roll.html",
        "systems/kopparhavet/templates/items/adversaryAttack-sheet.html",
        "systems/kopparhavet/templates/items/armor-sheet.html",
        "systems/kopparhavet/templates/items/gear-sheet.html",
        "systems/kopparhavet/templates/items/skill-sheet.html",
        "systems/kopparhavet/templates/items/spell-sheet.html",
        "systems/kopparhavet/templates/items/talent-sheet.html",
        "systems/kopparhavet/templates/items/weapon-sheet.html",
        "systems/kopparhavet/templates/items/shipweapon-sheet.html",
        "systems/kopparhavet/templates/items/shiptalent-sheet.html",
        "systems/kopparhavet/templates/parts/actor/ht-main.html",
        "systems/kopparhavet/templates/parts/actor/ht-combat.html",
        "systems/kopparhavet/templates/parts/actor/gear.html",
        "systems/kopparhavet/templates/parts/actor/ht-skills.html",
        "systems/kopparhavet/templates/parts/actor/talent.html",
        "systems/kopparhavet/templates/parts/shared/modifications.html",
        "systems/kopparhavet/templates/parts/actor/ship-main.html",
        "systems/kopparhavet/templates/parts/actor/ship-combat.html",
    ];
    return loadTemplates(templatePaths);
}

function normalize(data, defaultValue) {
    if (data) {
        return data.toLowerCase();
    } else {
        return defaultValue;
    }
}

function registerHandlebarsHelpers() {
    Handlebars.registerHelper("weaponCategory", function (category) {
        category = normalize(category, "melee");
        switch (category) {
            case "melee":
                return game.i18n.localize("WEAPON.MELEE");
            case "ranged":
                return game.i18n.localize("WEAPON.RANGED");
        }
    });

    Handlebars.registerHelper("rollDifficulty", function (difficulty) {
        difficulty = normalize(difficulty, "average");
        switch (difficulty) {
            case "simple":
                return game.i18n.localize("DIFFICULTY.SIMPLE");
            case "easy":
                return game.i18n.localize("DIFFICULTY.EASY");
            case "average":
                return game.i18n.localize("DIFFICULTY.AVERAGE");
            case "hard":
                return game.i18n.localize("DIFFICULTY.HARD");
            case "daunting":
                return game.i18n.localize("DIFFICULTY.DAUNTING");
        }
    });

    Handlebars.registerHelper("skillType", function (skillType) {
        skillType = normalize(skillType, "base");

        switch (skillType) {
            case "base":
                return game.i18n.localize("SKILL.BASE");
            case "adventure":
                return game.i18n.localize("SKILL.ADVENTURE");
            case "combat":
                return game.i18n.localize("SKILL.COMBAT");
        }
    });

    Handlebars.registerHelper("spellRoll", function (roll) {
        roll = normalize(roll, "roll");
        switch (roll) {
            case "roll":
                return game.i18n.localize("SPELL.ROLL");
            case "attackroll":
                return game.i18n.localize("SPELL.ATTACKROLL");
            case "opposite":
                return game.i18n.localize("SPELL.OPPOSITE");
            case "ritual":
                return game.i18n.localize("SPELL.RITUAL");
        }
    });

    // Allows {if X = Y} type syntax in html using handlebars
    Handlebars.registerHelper("iff", function (a, operator, b, opts) {
        var bool = false;
        switch (operator) {
            case "==":
                bool = a == b;
                break;
            case ">":
                bool = a > b;
                break;
            case "<":
                bool = a < b;
                break;
            case "!=":
                bool = a != b;
                break;
            case "contains":
                if (a && b) {
                    bool = a.includes(b);
                } else {
                    bool = false;
                }
                break;
            default:
                throw "Unknown operator " + operator;
        }

        if (bool) {
            return opts.fn(this);
        } else {
            return opts.inverse(this);
        }
    });

    Handlebars.registerHelper('plaintextToHTML', function(value) {
        // strip tags, add <br/> tags
        return new Handlebars.SafeString(value.replace(/(<([^>]+)>)/gi, "").replace(/(?:\r\n|\r|\n)/g, '<br/>'));
    });
}

function migrateWorld() {
    // Determine whether a system migration is required and feasible
    const currentVersion = game.settings.get("kopparhavet", "worldSchemaVersion");
    const NEEDS_MIGRATION_VERSION = "0.0.3";
    const COMPATIBLE_MIGRATION_VERSION = '0' || isNaN('NaN');
    let needMigration = currentVersion < NEEDS_MIGRATION_VERSION || currentVersion === null;

    // Perform the migration
    if (needMigration && game.user.isGM) {
        if (currentVersion && currentVersion < COMPATIBLE_MIGRATION_VERSION) {
            ui.notifications.error(
                `Your system data is from a version that cannot be reliably migrated to the latest version. The process will be attempted, but errors may occur.`,
                { permanent: true }
            );
        }

        migrations.migrateWorld();
    }
}