Modul:Timeline

local p = {}

local function esc(s)
    if not s then return "" end
    return s:gsub("&","&amp;"):gsub("<","&lt;"):gsub(">","&gt;")
end

local function yearToX(year, minYear, scale, startX)
    return startX + (year - minYear) * scale
end

function p.render(frame)
    local args = frame:getParent().args

    -- osnovne postavke
    local minYear = tonumber(args.minYear) or 2000
    local maxYear = tonumber(args.maxYear) or 2030
    local scale   = tonumber(args.scale) or 60
    local startX  = 60
    local padding = 80

    local width = startX + (maxYear - minYear) * scale + padding
    if width < 400 then width = 400 end

    -- SVG početak
    local svg = {}
    table.insert(svg, string.format(
        '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 %d 300">',
        width
    ))

    -- pozadina
    table.insert(svg, '<rect x="0" y="0" width="100%" height="300" fill="white" />')

    -- vremenska os
    table.insert(svg, '<g font-family="sans-serif" font-size="10" fill="#555">')
    local xEnd = yearToX(maxYear, minYear, scale, startX)
    table.insert(svg, string.format(
        '<line x1="%d" y1="30" x2="%d" y2="30" stroke="#aaa" />',
        startX, xEnd
    ))

    for y = minYear, maxYear do
        local x = yearToX(y, minYear, scale, startX)
        table.insert(svg, string.format('<text x="%d" y="25">%d</text>', x, y))
    end
    table.insert(svg, '</g>')

    -- crtanje redova
    local rowIndex = 1
    while args["row" .. rowIndex .. "_label"] do
        local label = args["row" .. rowIndex .. "_label"]
        local y     = tonumber(args["row" .. rowIndex .. "_y"]) or (50 + rowIndex * 40)
        local color = args["row" .. rowIndex .. "_color"] or "#cccccc"

        -- label reda
        table.insert(svg, string.format(
            '<text x="10" y="%d" font-family="sans-serif" font-size="11" fill="#333">%s</text>',
            y, esc(label)
        ))

        -- blokovi u redu
        local blockIndex = 1
        while args[string.format("row%d_block%d_start", rowIndex, blockIndex)] do
            local start = tonumber(args[string.format("row%d_block%d_start", rowIndex, blockIndex)])
            local stop  = tonumber(args[string.format("row%d_block%d_end",   rowIndex, blockIndex)]) or maxYear
            local text  = args[string.format("row%d_block%d_label", rowIndex, blockIndex)] or ""
            local tip   = args[string.format("row%d_block%d_tip",   rowIndex, blockIndex)] or ""
            local icon  = args[string.format("row%d_block%d_icon",  rowIndex, blockIndex)] or ""
            local col   = args[string.format("row%d_block%d_color", rowIndex, blockIndex)] or color

            local x1 = yearToX(start, minYear, scale, startX)
            local x2 = yearToX(stop,  minYear, scale, startX)
            local w  = x2 - x1
            if w < 6 then w = 6 end

            table.insert(svg, '<g font-family="sans-serif" font-size="9" fill="#000">')
            table.insert(svg, string.format(
                '<rect x="%d" y="%d" width="%d" height="14" fill="%s"><title>%s</title></rect>',
                x1, y - 10, w, esc(col), esc(tip)
            ))

            local labelText = icon ~= "" and (icon .. " " .. esc(text)) or esc(text)

            table.insert(svg, string.format(
                '<text x="%d" y="%d">%s</text>',
                x1 + 3, y, labelText
            ))
            table.insert(svg, '</g>')

            blockIndex = blockIndex + 1
        end

        rowIndex = rowIndex + 1
    end

    table.insert(svg, '</svg>')
    return table.concat(svg, "\n")
end

return p