// Render mode registry, factory, and entitlements for the render kit (RK).
(function (root) {
    'use strict';
    var RK = root.RK = root.RK || {};
    RK.localRenderersEnabled = function () {
        return !!(root.WOWNGEON_RUNTIME && root.WOWNGEON_RUNTIME.rendererLocalEnabled === true);
    };
    RK.externalRenderersEnabled = function () {
        return !!(root.WOWNGEON_RUNTIME && root.WOWNGEON_RUNTIME.rendererCdnEnabled === true);
    };
    RK.isModeRuntimeAvailable = function (id) {
        if (!RK.modeMeta || !RK.modeMeta(id)) return false;
        if (id === '3d') {
            return !!(RK.THREE && RK.THREE.THREE)
                || RK.localRenderersEnabled()
                || RK.externalRenderersEnabled();
        }
        return true;
    };

    // Render tiers. `premium` marks modes intended to be unlocked with credits: a cosmetic
    // entitlement gated by Operator Policy, the same pattern as avatar unlocks. NOTE: rendering
    // is client-side, so this is a soft/honour gate for cosmetics, not a hard security boundary.
    // Modes are TECHNIQUES (how a scene is drawn). Packs are the SETS/styles within a projection
    // (chosen via the pack picker), so "Fancy" (tiles + FX) is a topdown PACK, not a mode. A
    // premium mode unlocks once the user has ANY unlocked pack for its projection.
    RK.RENDER_MODES = [
        { id: 'tiles', label: 'Tiled', premium: false, projection: 'topdown' },
        { id: 'ascii', label: 'ASCII', premium: false, projection: 'topdown' },
        { id: 'iso', label: 'Iso', premium: true, projection: 'iso' },
        { id: '3d', label: '3D', premium: true, projection: '3d' }
    ];

    RK.entitlements = RK.entitlements || { premium: false, level: 'free', packs: {} };
    // Per-session QA bypass for premium render-mode gating (Fancy/Iso/3D). Default OFF. A tester
    // opts IN for their own browser only via ?unlock=1 (persisted); nobody else is affected:
    //   ?unlock=1  -> on (sticky)     ?unlock=0  -> off
    RK.RENDER_MODE_TEST_UNLOCKS = false;
    try {
        var q = (root.location && root.location.search) || '';
        var m = /[?&]unlock=([01])/.exec(q);
        if (m) { try { root.localStorage.setItem('rk_unlock_all', m[1]); } catch (_) {} }
        RK.RENDER_MODE_TEST_UNLOCKS = (root.localStorage && root.localStorage.getItem('rk_unlock_all') === '1');
    } catch (_) { /* no location/localStorage */ }
    RK.renderModeTestUnlocks = function () { return RK.RENDER_MODE_TEST_UNLOCKS === true; };

    RK.modeMeta = function (id) {
        for (var i = 0; i < RK.RENDER_MODES.length; i++) {
            if (RK.RENDER_MODES[i].id === id) return RK.RENDER_MODES[i];
        }
        return null;
    };

    RK.canUseMode = function (id) {
        var m = RK.modeMeta(id);
        if (!m) return false;
        if (!RK.isModeRuntimeAvailable(id)) return false;
        if (RK.renderModeTestUnlocks && RK.renderModeTestUnlocks()) return true;
        if (!m.premium) return true;
        // A premium mode is available once the user has ANY unlocked pack for its projection.
        if (m.projection && RK.unlockedPacks) return RK.unlockedPacks(m.projection).length > 0;
        if (m.pack && RK.canUsePack) return RK.canUsePack(m.pack);
        return !!RK.entitlements.premium;
    };

    RK.modeAvailability = function (id) {
        var runtimeAvailable = RK.isModeRuntimeAvailable(id);
        var usable = runtimeAvailable && RK.canUseMode(id);
        return {
            usable: usable,
            runtimeAvailable: runtimeAvailable,
            reason: !runtimeAvailable ? 'runtime_unavailable' : (usable ? null : 'entitlement_locked')
        };
    };

    RK.createRenderer = function (mode, host, opts) {
        if (!RK.canUseMode(mode)) return new RK.TileRenderer(host, opts);
        if (mode === 'ascii' && RK.AsciiRenderer) return new RK.AsciiRenderer(host, opts);
        if (mode === 'iso' && RK.IsoRenderer) return new RK.IsoRenderer(host, opts);
        if (mode === '3d' && RK.ThreeRenderer && RK.THREE) {
            try { return new RK.ThreeRenderer(host, opts); }
            catch (e) {
                if (root.console) console.warn('3D renderer failed; using tiled:', e && e.message);
                return new RK.TileRenderer(host, opts);
            }
        }
        if (mode === 'fancy') {
            try {
                if (!RK.FancyRenderer) throw new Error('fancy renderer not loaded');
                return new RK.FancyRenderer(host, opts);
            } catch (e) {
                if (root.console) console.warn('Fancy renderer unavailable; using tiled:', e.message);
                return new RK.TileRenderer(host, opts);
            }
        }
        return new RK.TileRenderer(host, opts); // default / fallback
    };

    // Lazy-load PixiJS (+ @pixi/unsafe-eval for the strict CSP) only when Fancy is first needed,
    // so ASCII/Tiled users never download the WebGL library.
    var pixiLoading = false, pixiCbs = [];
    RK.pixiReady = function () { return typeof PIXI !== 'undefined'; };
    RK.ensurePixi = function (cb) {
        if (RK.pixiReady()) { cb(true); return; }
        if (!RK.externalRenderersEnabled()) { cb(false); return; }
        pixiCbs.push(cb);
        if (pixiLoading) return;
        pixiLoading = true;
        var inject = function (src, onload, onerror) {
            var el = document.createElement('script');
            el.src = src; el.onload = onload; el.onerror = onerror;
            document.head.appendChild(el);
        };
        var done = function (ok) { var cbs = pixiCbs; pixiCbs = []; cbs.forEach(function (f) { f(ok); }); };
        inject('https://cdn.jsdelivr.net/npm/pixi.js@7.4.2/dist/pixi.min.js', function () {
            // @pixi/unsafe-eval patches the shader compiler on load (needed under the CSP).
            inject('https://cdn.jsdelivr.net/npm/@pixi/unsafe-eval@7.4.2/dist/unsafe-eval.min.js',
                function () { done(true); }, function () { done(false); });
        }, function () { done(false); });
    };

    var threeLoading = false, threeCbs = [];
    RK.threeReady = function () { return !!(RK.THREE && RK.THREE.THREE); };
    RK.threeModuleSources = function () {
        if (RK.localRenderersEnabled()) {
            var version = String(root.WOWNGEON_RUNTIME.rendererLocalVersion || '');
            if (!/^\d+\.\d+\.\d+$/.test(version)) return null;
            var base = '/vendor/three/' + version;
            return {
                library: base + '/three.module.min.js',
                loader: base + '/addons/loaders/GLTFLoader.js',
                skeleton: base + '/addons/utils/SkeletonUtils.js'
            };
        }
        if (!RK.externalRenderersEnabled()) return null;
        return {
            library: 'https://cdn.jsdelivr.net/npm/three@0.160.0/+esm',
            loader: 'https://cdn.jsdelivr.net/npm/three@0.160.0/examples/jsm/loaders/GLTFLoader.js/+esm',
            skeleton: 'https://cdn.jsdelivr.net/npm/three@0.160.0/examples/jsm/utils/SkeletonUtils.js/+esm'
        };
    };
    RK.ensureThree = function (cb) {
        if (RK.threeReady()) { cb(true); return; }
        var sources = RK.threeModuleSources();
        if (!sources) { cb(false); return; }
        threeCbs.push(cb);
        if (threeLoading) return;
        threeLoading = true;
        Promise.all([
            import(sources.library),
            import(sources.loader),
            import(sources.skeleton)
        ]).then(function (mods) {
            threeLoading = false;
            RK.THREE = {
                THREE: mods[0],
                GLTFLoader: mods[1].GLTFLoader,
                SkeletonUtils: mods[2]
            };
            var cbs = threeCbs; threeCbs = [];
            cbs.forEach(function (f) { f(true); });
        }).catch(function (e) {
            threeLoading = false;
            if (root.console) console.warn('Three renderer unavailable:', e && e.message);
            var cbs = threeCbs; threeCbs = [];
            cbs.forEach(function (f) { f(false); });
        });
    };

    // Create a renderer, loading Pixi on demand for Fancy; falls back to Tiled if Pixi fails.
    RK.createRendererAsync = function (mode, host, opts, cb) {
        if (!RK.canUseMode(mode)) {
            cb(new RK.TileRenderer(host, opts));
            return;
        }
        if (mode === 'fancy') {
            RK.ensurePixi(function (ok) {
                if (!ok) { cb(new RK.TileRenderer(host, opts)); return; }
                try { cb(new RK.FancyRenderer(host, opts)); }
                catch (e) {
                    if (root.console) console.warn('Fancy renderer failed; using tiled:', e.message);
                    cb(new RK.TileRenderer(host, opts));
                }
            });
            return;
        }
        if (mode === '3d') {
            RK.ensureThree(function (ok) {
                if (!ok) { cb(new RK.TileRenderer(host, opts)); return; }
                try { cb(new RK.ThreeRenderer(host, opts)); }
                catch (e) {
                    if (root.console) console.warn('3D renderer failed; using tiled:', e.message);
                    cb(new RK.TileRenderer(host, opts));
                }
            });
            return;
        }
        cb(RK.createRenderer(mode, host, opts));
    };

    RK.loadMode = function (def) {
        try {
            var m = localStorage.getItem('rk_mode');
            if (RK.modeMeta(m) && RK.canUseMode(m)) return m;
        } catch (_) { /* ignore */ }
        return def || 'tiles';
    };

    RK.saveMode = function (mode) {
        try { localStorage.setItem('rk_mode', mode); } catch (_) { /* ignore */ }
    };
})(window);