// Shared scene model + adapters for the render kit (RK).
//
// A Scene is a renderer-agnostic description of a grid world + entities. Any renderer
// (ASCII / tiled / fancy) draws the same Scene, and any surface (tavern / main game) can
// produce one via an adapter. This file is DOM-free so the adapters stay unit-testable.
(function (root) {
    'use strict';

    // Tile kinds and how each renderer treats them (glyph for ASCII, colour for tiled/fancy).
    var TAVERN_LEGEND = {
        wall:  { char: '#', color: '#20262e', solid: true },
        floor: { char: '·', color: '#0c1410', solid: false },
        bar:   { char: '=', color: '#5a4632', solid: true },
        table: { char: 'o', color: '#4a3a28', solid: true }
    };

    // Layout character -> tile kind.
    var TAVERN_TILE_OF = { '#': 'wall', '.': 'floor', '@': 'floor', '=': 'bar', 'o': 'table' };

    var AVATAR_COLORS = { 'default': '#9aa4b2', green: '#3fb950', amber: '#d29922', red: '#f85149' };

    // Build a Scene from a tavern room state ({ layout, cols, rows, occupants }).
    function sceneFromTavern(state, youId) {
        state = state || {};
        var layout = state.layout || [];
        var walkable = state.walkable || null;
        var rows = state.rows || layout.length;
        var cols = state.cols || (layout[0] ? layout[0].length : 0);

        var grid = [];
        for (var y = 0; y < rows; y++) {
            var srcRow = layout[y] || '';
            var row = [];
            for (var x = 0; x < cols; x++) {
                if (layout[y]) row.push(TAVERN_TILE_OF[srcRow[x]] || 'wall');
                else if (walkable && walkable[y]) row.push(walkable[y][x] ? 'floor' : 'wall');
                else row.push('wall');
            }
            grid.push(row);
        }

        var occ = state.occupants || [];
        var entities = occ.map(function (o) {
            var appearance = o.appearance || (o.avatar ? { avatar: o.avatar } : null);
            var avatar = (appearance && appearance.avatar) || o.avatar;
            return {
                id: o.id,
                x: o.x,
                y: o.y,
                kind: 'avatar',
                avatar: avatar,   // preserved so renderers can detect premium skins
                appearance: appearance,
                color: AVATAR_COLORS[avatar] || AVATAR_COLORS.default,
                char: '@',
                facing: o.facing || 'down',
                label: o.name || null,
                you: !!youId && o.id === youId
            };
        });

        return {
            cols: cols,
            rows: rows,
            grid: grid,
            legend: TAVERN_LEGEND,
            entities: entities,
            background: '#0a0c0f'
        };
    }

    var api = {
        sceneFromTavern: sceneFromTavern,
        TAVERN_LEGEND: TAVERN_LEGEND,
        AVATAR_COLORS: AVATAR_COLORS
    };

    // ---- Dungeon game-state adapter ------------------------------------------------
    // Converts a game state (from the server's game_start/game_update/spectator_update) into a
    // renderer-agnostic Scene, so the render kit can draw the dungeon just like the tavern.
    // This is the bridge for milestone R1 (main game → render kit) and T2b (tavern spectator).

    var DUNGEON_LEGEND = {
    wall:     { char: '#',  color: '#2a2f38', solid: true },
    floor:    { char: '·',  color: '#15191f', solid: false },
    floor2:   { char: '·',  color: '#181c22', solid: false },
    entrance: { char: '<',  color: '#3fb950', solid: false },
    exit:     { char: '>',  color: '#d29922', solid: false },
    treasure: { char: '$',  color: '#fbbf24', solid: false },
    torch:    { char: '#',  color: '#3a3028', solid: true },
    dark:     { char: ' ',  color: '#0a0c0f', solid: true }
};

// Map dungeon tile characters to scene tile kinds.
function dungeonTileKind(ch) {
    if (ch === '#') return 'wall';
    if (ch === 'torch') return 'torch';
    if (ch === "'1" || ch === 0) return 'floor';
    if (ch === "'2") return 'floor2';
    if (ch === '<') return 'entrance';
    if (ch === '>') return 'exit';
    if (ch === '$' || ch === '$W' || ch === '$M') return 'treasure';
    return 'floor';
}

function sceneFromGameState(state, opts) {
    state = state || {};
    opts = opts || {};
    var visible = state.visibleTiles || {};
    var explored = state.exploredTiles || {};
    var lighting = state.lighting || {};
    var rows = visible.length || (state.dungeonRows || 0);
    var cols = 0;
    for (var y = 0; y < rows; y++) {
        if (visible[y]) cols = Math.max(cols, visible[y].length);
        if (explored[y]) cols = Math.max(cols, explored[y].length);
    }
    if (!cols && state.dungeonCols) cols = state.dungeonCols;

    var grid = [];
    var lightGrid = [];
    for (var y = 0; y < rows; y++) {
        var row = [];
        var lrow = [];
        for (var x = 0; x < cols; x++) {
            var ch = null;
            var isVisible = visible[y] && visible[y][x] !== undefined;
            if (isVisible) {
                ch = visible[y][x];
            } else if (explored[y] && explored[y][x] !== undefined) {
                ch = explored[y][x];
            }
            if (ch === null || ch === undefined || ch === ' ') {
                row.push('dark');
                lrow.push(0);
            } else {
                row.push(dungeonTileKind(ch));
                // Lighting: 0 = fully lit, higher = darker. Convert to brightness (1 = lit).
                var la = (lighting[y] && lighting[y][x]) || 0;
                lrow.push(isVisible ? Math.max(0.15, 1 - Math.min(la, 0.8)) : 0.25);
            }
        }
        grid.push(row);
        lightGrid.push(lrow);
    }

    var entities = [];

    // Entrance / exit / treasure as entities (so they layer above tiles).
    if (state.entrance) {
        entities.push({ id: 'entrance', x: state.entrance[0], y: state.entrance[1], kind: 'feature', char: '<', color: '#3fb950', label: null });
    }
    if (state.exit) {
        entities.push({ id: 'exit', x: state.exit[0], y: state.exit[1], kind: 'feature', char: '>', color: '#d29922', label: null });
    }
    if (state.treasure) {
        var tChar = opts.cryptoType === 'XMR' ? '$M' : '$W';
        entities.push({ id: 'treasure', x: state.treasure[0], y: state.treasure[1], kind: 'feature', char: tChar, color: '#fbbf24', label: null });
    }

    // Items.
    if (state.items) {
        for (var key in state.items) {
            if (state.items.hasOwnProperty(key)) {
                var item = state.items[key];
                if (item && typeof item.x === 'number') {
                    entities.push({ id: 'item:' + key, x: item.x, y: item.y, kind: 'item', char: '$', color: '#fbbf24', label: null });
                }
            }
        }
    }

    // Monster.
    if (state.monster) {
        entities.push({
            id: 'monster', x: state.monster.x, y: state.monster.y,
            kind: 'monster', char: '~', color: '#f85149', label: null
        });
    }

    // Player.
    if (state.player) {
        var playerEntity = {
            id: 'player', x: state.player.x, y: state.player.y,
            kind: 'player', char: '@', color: '#9aa4b2',
            facing: state.player.facing || 'down', label: null,
            you: !state.isSpectating
        };
        // Attach the player's appearance if available (for render-kit character rendering).
        if (opts.playerAppearance) {
            playerEntity.avatar = opts.playerAppearance.avatar || 'default';
            playerEntity.appearance = opts.playerAppearance;
        } else {
            playerEntity.avatar = 'default';
            playerEntity.appearance = { avatar: 'default', tint: 'none', equipment: { body: 'none', head: 'none', shield: 'none', weapon: 'none' } };
        }
        entities.push(playerEntity);
    }

    return {
        cols: cols,
        rows: rows,
        grid: grid,
        legend: DUNGEON_LEGEND,
        entities: entities,
        lightGrid: lightGrid,
        background: '#0a0c0f',
        isDungeon: true
    };
}

    api.sceneFromGameState = sceneFromGameState;
    api.DUNGEON_LEGEND = DUNGEON_LEGEND;

    root.RK = root.RK || {};
    root.RK.scene = api;
    if (typeof module !== 'undefined' && module.exports) module.exports = api;
})(typeof window !== 'undefined' ? window : this);