/**
 * Adaptive Tactics - Content Loader
 * Fetches and parses all JSON content files
 */

import { Weapon, Unit, MapData } from './models.js';

/**
 * Fetch and parse a JSON file
 */
async function fetchJSON(path) {
    console.log(`Loading: ${path}`);
    try {
        const response = await fetch(path);
        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
        const data = await response.json();
        console.log(`Loaded: ${path}`);
        return data;
    } catch (error) {
        console.error(`Failed to load ${path}:`, error);
        throw error;
    }
}

/**
 * Load all game content
 */
export async function loadAllContent() {
    const content = {
        weapons: {},
        playerUnits: [],
        ephraimForms: {},
        enemyTemplates: {},
        map: null,
        majorPackages: {},
        minorModifiers: {},
        transitionLines: {},
        gameRules: {}
    };

    // Load all content files in parallel
    const [
        weaponsData,
        playerUnitsData,
        ephraimFormsData,
        enemyTemplatesData,
        mapData,
        majorPackagesData,
        minorModifiersData,
        transitionLinesData,
        gameRulesData
    ] = await Promise.all([
        fetchJSON('content/items/weapons.json'),
        fetchJSON('content/units/player_units.json'),
        fetchJSON('content/units/ephraim_forms.json'),
        fetchJSON('content/units/forced_servitude_templates.json'),
        fetchJSON('content/maps/fortress_map_01.json'),
        fetchJSON('content/adaptation/major_packages.json'),
        fetchJSON('content/adaptation/minor_modifiers.json'),
        fetchJSON('content/text/cycle_transition_lines.json'),
        fetchJSON('content/balance/game_rules.json')
    ]);

    // Process weapons
    for (const [id, data] of Object.entries(weaponsData.weapons)) {
        content.weapons[id] = new Weapon(data);
    }

    // Process player units
    for (const data of playerUnitsData.player_units) {
        // Build weapon references for the unit
        const unitWeapons = {};
        for (const weaponId of data.weapons) {
            if (content.weapons[weaponId]) {
                unitWeapons[weaponId] = content.weapons[weaponId];
            }
        }
        content.playerUnits.push({
            template: data,
            weapons: unitWeapons
        });
    }

    // Process Ephraim forms
    content.ephraimForms = ephraimFormsData.ephraim_forms;

    // Process enemy templates
    content.enemyTemplates = enemyTemplatesData.enemy_templates;

    // Process map
    content.map = new MapData(mapData);

    // Process adaptation packages
    content.majorPackages = majorPackagesData.major_packages;
    content.minorModifiers = minorModifiersData.minor_modifiers;

    // Process transition lines
    content.transitionLines = transitionLinesData.transition_lines;

    // Process game rules
    content.gameRules = gameRulesData.rules;

    return content;
}

/**
 * Create a player unit instance from template
 */
export function createPlayerUnit(template, weapons, playerName = null) {
    const data = { ...template };
    data.faction = 'player';

    // Set player name for Oathbearer
    if (data.id === 'oathbearer' && playerName) {
        data.name = playerName;
    }

    return new Unit(data, weapons);
}

/**
 * Create an enemy unit instance from template
 */
export function createEnemyUnit(templateId, templates, weapons, cycle, weaponId = null) {
    const template = templates[templateId];
    if (!template) {
        console.error(`Unknown enemy template: ${templateId}`);
        return null;
    }

    // Determine scaling band
    let scalingKey;
    if (templateId === 'dark_mount') {
        if (cycle === 2) scalingKey = 'cycle_2';
        else if (cycle <= 4) scalingKey = 'cycles_3_4';
        else if (cycle <= 6) scalingKey = 'cycles_5_6';
        else scalingKey = 'cycles_7_plus';
    } else {
        if (cycle <= 2) scalingKey = 'cycles_1_2';
        else if (cycle <= 4) scalingKey = 'cycles_3_4';
        else if (cycle <= 6) scalingKey = 'cycles_5_6';
        else scalingKey = 'cycles_7_plus';
    }

    const stats = template.scaling[scalingKey];
    if (!stats) {
        console.error(`No scaling data for ${templateId} at ${scalingKey}`);
        return null;
    }

    // Determine weapon
    const equippedWeapon = weaponId || template.weapons[0];

    // Build unit data
    const unitData = {
        id: `${templateId}_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
        name: template.name,
        title: '',
        sprite: template.sprite,
        faction: 'enemy',
        stats: {
            hp: stats.hp,
            maxHp: stats.hp,
            power: stats.power,
            skill: stats.skill,
            speed: stats.speed,
            def: stats.def,
            res: stats.res,
            mov: stats.mov
        },
        weapons: [equippedWeapon],
        equippedWeapon: equippedWeapon
    };

    // Build weapon references
    const unitWeapons = {};
    unitWeapons[equippedWeapon] = weapons[equippedWeapon];

    return new Unit(unitData, unitWeapons);
}

/**
 * Create Ephraim unit instance
 */
export function createEphraim(forms, weapons, formId) {
    const form = forms[formId];
    if (!form) {
        console.error(`Unknown Ephraim form: ${formId}`);
        return null;
    }

    const unitData = {
        id: 'ephraim',
        name: form.name,
        title: form.title,
        sprite: form.sprite,
        portrait: form.portrait,
        faction: 'enemy',
        stats: {
            hp: form.stats.hp,
            maxHp: form.stats.maxHp,
            power: form.stats.power,
            skill: form.stats.skill,
            speed: form.stats.speed,
            def: form.stats.def,
            res: form.stats.res,
            mov: form.stats.mov
        },
        weapons: form.weapons,
        equippedWeapon: form.equippedWeapon,
        behavior: form.behavior
    };

    // Build weapon references
    const unitWeapons = {};
    for (const weaponId of form.weapons) {
        if (weapons[weaponId]) {
            unitWeapons[weaponId] = weapons[weaponId];
        }
    }

    const unit = new Unit(unitData, unitWeapons);
    unit.behavior = form.behavior;
    unit.portrait = form.portrait;

    return unit;
}