function export_case()
%EXPORT_CASE  按 case_config.m 写出 bele3d.json（含 bele 块）

[phy, cfg] = case_config();
root = fileparts(mfilename('fullpath'));
jsonPath = fullfile(root, cfg.jsonFile);

sbcIndex = phy.out(:)';

doc = struct();
doc.FemType = cfg.FemType;
doc.EletricType = cfg.EletricType;
doc.lambda = phy.lda0;
doc.NbrBoundary = cfg.NbrBoundary;
doc.BoundaryFlag = cfg.BoundaryFlag;

doc.sbc = struct( ...
    'Index', sbcIndex, ...
    'SBCType', zeros(1, nSbc), ...
    'E0x', {repmat({'0'}, 1, nSbc)}, ...
    'E0y', {repmat({'0'}, 1, nSbc)}, ...
    'E0z', {repmat({'0'}, 1, nSbc)}, ...
    'kx', zeros(1, nSbc), ...
    'ky', zeros(1, nSbc), ...
    'kz', zeros(1, nSbc));

doc.bele = struct( ...
    'index', phy.beleDomains, ...
    'Ebx', 'exp(-2.5*i*pi*(z+0.5))', ...
    'Eby', '0', ...
    'Ebz', '0', ...
    'curlEbx', '0', ...
    'curlEby', '-2.5*i*pi*exp(-2.5*i*pi*(z+0.5))', ...
    'curlEbz', '0');

nDom = numel(phy.eps);
doc.NbrDomain = nDom;
doc.domainType = repmat(2, 1, nDom);
doc.domainIndex = 0:(nDom - 1);
doc.matType = zeros(1, nDom);
doc.epsilonrR = phy.eps(:)';
doc.epsilonrI = zeros(1, nDom);
doc.murR = phy.mur(:)';
doc.murI = zeros(1, nDom);
doc.chiheR = zeros(1, nDom);
doc.chiehR = zeros(1, nDom);
doc.chiheI = zeros(1, nDom);
doc.chiehI = zeros(1, nDom);
doc.sigma = zeros(1, nDom);
doc.n = ones(1, nDom);
doc.k = zeros(1, nDom);
doc.MeshFile = cfg.MeshFile;
doc.OutFile = cfg.OutFile;

txt = write_bele_json(doc);
fid = fopen(jsonPath, 'w');
if fid < 0
    error('无法写入: %s', jsonPath);
end
fprintf(fid, '%s', txt);
fclose(fid);
fprintf('已写出 %s\n', jsonPath);
end

function txt = write_bele_json(doc)
lines = {};
lines{end+1} = '{';
lines{end+1} = sprintf('  "FemType": %d,', doc.FemType);
lines{end+1} = sprintf('  "EletricType": %d,', doc.EletricType);
lines{end+1} = sprintf('  "lambda": %g,', doc.lambda);
lines{end+1} = sprintf('  "NbrBoundary": %d,', doc.NbrBoundary);
lines{end+1} = sprintf('  "BoundaryFlag": %s,', fmt_int_row(doc.BoundaryFlag));
lines{end+1} = '  "sbc": {';
lines{end+1} = sprintf('    "Index": %s,', fmt_int_row(doc.sbc.Index));
lines{end+1} = sprintf('    "SBCType": %s,', fmt_int_row(doc.sbc.SBCType));
lines{end+1} = sprintf('    "E0x": %s,', fmt_str_row(doc.sbc.E0x));
lines{end+1} = sprintf('    "E0y": %s,', fmt_str_row(doc.sbc.E0y));
lines{end+1} = sprintf('    "E0z": %s,', fmt_str_row(doc.sbc.E0z));
lines{end+1} = sprintf('    "kx": %s,', fmt_int_row(doc.sbc.kx));
lines{end+1} = sprintf('    "ky": %s,', fmt_int_row(doc.sbc.ky));
lines{end+1} = sprintf('    "kz": %s', fmt_int_row(doc.sbc.kz));
lines{end+1} = '  },';
lines{end+1} = '  "bele": {';
lines{end+1} = sprintf('    "index": %s,', fmt_int_row(doc.bele.index));
lines{end+1} = sprintf('    "Ebx": "%s",', doc.bele.Ebx);
lines{end+1} = sprintf('    "Eby": "%s",', doc.bele.Eby);
lines{end+1} = sprintf('    "Ebz": "%s",', doc.bele.Ebz);
lines{end+1} = sprintf('    "curlEbx": "%s",', doc.bele.curlEbx);
lines{end+1} = sprintf('    "curlEby": "%s",', doc.bele.curlEby);
lines{end+1} = sprintf('    "curlEbz": "%s"', doc.bele.curlEbz);
lines{end+1} = '  },';
lines{end+1} = sprintf('  "NbrDomain": %d,', doc.NbrDomain);
lines{end+1} = sprintf('  "domainType": %s,', fmt_int_row(doc.domainType));
lines{end+1} = sprintf('  "domainIndex": %s,', fmt_int_row(doc.domainIndex));
lines{end+1} = sprintf('  "matType": %s,', fmt_int_row(doc.matType));
lines{end+1} = sprintf('  "epsilonrR": %s,', fmt_float_row(doc.epsilonrR));
lines{end+1} = sprintf('  "epsilonrI": %s,', fmt_float_row(doc.epsilonrI));
lines{end+1} = sprintf('  "murR": %s,', fmt_float_row(doc.murR));
lines{end+1} = sprintf('  "murI": %s,', fmt_float_row(doc.murI));
lines{end+1} = sprintf('  "chiheR": %s,', fmt_float_row(doc.chiheR));
lines{end+1} = sprintf('  "chiehR": %s,', fmt_float_row(doc.chiehR));
lines{end+1} = sprintf('  "chiheI": %s,', fmt_float_row(doc.chiheI));
lines{end+1} = sprintf('  "chiehI": %s,', fmt_float_row(doc.chiehI));
lines{end+1} = sprintf('  "sigma": %s,', fmt_float_row(doc.sigma));
lines{end+1} = sprintf('  "n": %s,', fmt_float_row(doc.n));
lines{end+1} = sprintf('  "k": %s,', fmt_float_row(doc.k));
lines{end+1} = sprintf('  "MeshFile": "%s",', doc.MeshFile);
lines{end+1} = sprintf('  "OutFile": "%s"', doc.OutFile);
lines{end+1} = '}';
txt = strjoin(lines, newline);
end

function s = fmt_int_row(v)
s = ['[', strjoin(arrayfun(@num2str, v(:)', 'UniformOutput', false), ', '), ']'];
end

function s = fmt_float_row(v)
s = ['[', strjoin(arrayfun(@(x) num2str(x, '%.16g'), v(:)', 'UniformOutput', false), ', '), ']'];
end

function s = fmt_str_row(c)
parts = cell(1, numel(c));
for i = 1:numel(c)
    parts{i} = ['"', char(c{i}), '"'];
end
s = ['[', strjoin(parts, ', '), ']'];
end