-- Base building materials for the clone.
--
-- The engine reads the global `Materials` array (in order). Build modes 1/2/3
-- map to entries 1/2/3. Mods under data/mods/ run AFTER this file and may use
-- FindMaterial(name) to tweak these, or table.insert(Materials, ...) to add new
-- ones. (angle_threshold is in DEGREES; the engine converts to radians.)

Materials =
{
    {
        name = "wood",
        stiffness = 600, damping = 12, mass = 0.25,
        max_compression = 0.90, max_expansion = 1.10,  -- snaps past +/-10% length
        angle_threshold = 30, tension_only = false,    -- snaps if a loose strut rotates >30deg
        min_length = 0.4, max_length = 3.0, max_link_length = 6.0,  -- single-strut size limits
        hit_points = 150,
        flammable = true, burn_rate = 15, spread_time = 2.0,   -- wood: slow burn/spread
        blocks_projectiles = true, blocks_beam = true,         -- solid: stops shells & beams
        half_width = 0.15,
        color = { 1.0, 1.0, 1.0, 1.0 },                 -- white = show texture untinted
        texture = "data/textures/wood.png",
    },
    {
        name = "bgbrace",                               -- background bracing
        stiffness = 600, damping = 12, mass = 0.25,
        max_compression = 0.92, max_expansion = 1.08,
        angle_threshold = 30, tension_only = false,
        min_length = 0.4, max_length = 3.0, max_link_length = 6.0,
        hit_points = 100,
        flammable = true, burn_rate = 22, spread_time = 0.7,   -- burns ~3x faster than wood
        blocks_projectiles = false, blocks_beam = false,       -- shells AND beams pass through (beam still burns it)
        half_width = 0.15,
        color = { 1.0, 1.0, 1.0, 0.45 },                -- translucent
        texture = "data/textures/bgbrace.png",
    },
    {
        name = "rope",
        stiffness = 150, damping = 8, mass = 0.05,
        max_compression = 0.0, max_expansion = 1.50,    -- slack in compression, snaps at +50%
        angle_threshold = 360, tension_only = true,     -- never snaps on angle
        min_length = 0.8, max_length = 1.5, max_link_length = 20.0,  -- subdivides into many segments -> drapes
        hit_points = 50,
        flammable = true, burn_rate = 25, spread_time = 1.0,   -- burns through fast
        blocks_projectiles = false, blocks_beam = false,       -- shells AND beams pass through
        half_width = 0.04,
        color = { 0.15, 0.12, 0.10, 1.0 },
    },
}

-- Helpers mods can use (mirrors the Forts modding API shape).
function IndexOfMaterial(name)
    for i, m in ipairs(Materials) do
        if m.name == name then return i end
    end
    return nil
end

function FindMaterial(name)
    local i = IndexOfMaterial(name)
    if i then return Materials[i] end
    return nil
end