local World = require("game.world")
local Palette = require("rendering.palette")
local Fonts = require("rendering.fonts")

local HUD = {}

-- Tiny top-down tank icon (like the original lives display)
local function drawTankIcon(cx, cy, s)
    -- Hull outline
    love.graphics.line(cx - s*1.2, cy - s*0.5, cx + s*0.6, cy - s*0.5)
    love.graphics.line(cx + s*0.6, cy - s*0.5, cx + s*0.8, cy)
    love.graphics.line(cx + s*0.8, cy, cx + s*0.6, cy + s*0.5)
    love.graphics.line(cx + s*0.6, cy + s*0.5, cx - s*1.2, cy + s*0.5)
    love.graphics.line(cx - s*1.2, cy + s*0.5, cx - s*1.2, cy - s*0.5)
    -- Barrel
    love.graphics.line(cx + s*0.4, cy - s*0.15, cx + s*1.8, cy - s*0.15)
    love.graphics.line(cx + s*0.4, cy + s*0.15, cx + s*1.8, cy + s*0.15)
end

local function bearingLabel(player, enemy)
    -- Returns an arcade-style directional message: "ENEMY IN RANGE",
    -- "ENEMY TO LEFT", "ENEMY TO RIGHT", or "ENEMY TO REAR". Returns nil
    -- when there is no targetable enemy (e.g. only a saucer present).
    if not (enemy and enemy.alive) then return nil end
    local dx, dz = World.wrappedDist(player.x, player.z, enemy.x, enemy.z)
    local cosA = math.cos(player.angle)
    local sinA = math.sin(player.angle)
    local rx = dx * cosA - dz * sinA        -- rightward
    local rz = dx * sinA + dz * cosA        -- forward
    local dist = math.sqrt(rx * rx + rz * rz)
    local bearing = math.atan2(rx, rz)
    if rz > 0 and math.abs(bearing) < 0.25 and dist < 800 then
        return "ENEMY IN RANGE"
    end
    if math.abs(bearing) > 3 * math.pi / 4 then return "ENEMY TO REAR" end
    if bearing > 0 then return "ENEMY TO RIGHT" end
    return "ENEMY TO LEFT"
end

function HUD.draw(player, enemy)
    local p = Palette.get()
    local sw = World.screenW
    local sh = World.screenH
    local rh = World.radarH
    local sc = sw / 1024

    -- === LIVES (top-left) as tank icons ===
    love.graphics.setColor(p.bright)
    love.graphics.setLineWidth(1.3 * sc)
    local iconSize = 7 * sc
    local iconSpacing = 26 * sc
    local livesStartX = 30 * sc
    local livesY = rh * 0.25

    for i = 1, math.min(World.lives, 6) do
        drawTankIcon(livesStartX + (i - 1) * iconSpacing, livesY, iconSize)
    end

    -- === STATUS MESSAGES (authentic arcade: top-left of display) ===
    -- "MOTION BLOCKED BY OBJECT" takes priority while active, then falls back to
    -- the directional enemy text ("ENEMY IN RANGE" / "ENEMY TO LEFT/RIGHT/REAR").
    if player and player.alive then
        love.graphics.setFont(Fonts.small)
        if (player.blockedMessageTimer or 0) > 0 then
            local alpha = math.min(1, player.blockedMessageTimer / 0.3)
            love.graphics.setColor(p.bright[1], p.bright[2], p.bright[3], alpha)
            love.graphics.print("MOTION BLOCKED BY OBJECT", livesStartX, rh * 0.55)
        else
            local label = bearingLabel(player, enemy)
            if label then
                love.graphics.setColor(p.bright)
                love.graphics.print(label, livesStartX, rh * 0.55)
            end
        end
    end

    -- === SCORE (top-right, right-aligned) ===
    love.graphics.setFont(Fonts.medium)
    love.graphics.setColor(p.bright)
    local scoreStr = string.format("%09d", World.score)
    local rightEdge = sw - 30 * sc
    local valW = Fonts.medium:getWidth(scoreStr)
    local scoreY = rh * 0.35
    love.graphics.print(scoreStr, rightEdge - valW, scoreY)

    -- === HIGH SCORE (below score) ===
    love.graphics.setFont(Fonts.small)
    love.graphics.setColor(p.bright[1], p.bright[2], p.bright[3], 0.7)
    local hsY = scoreY + Fonts.medium:getHeight() + 2 * sc
    local hsStr = string.format("%09d", World.highScore)
    local hsW = Fonts.small:getWidth(hsStr)
    love.graphics.print(hsStr, rightEdge - hsW, hsY)

    -- === SEPARATOR LINE ===
    love.graphics.setColor(p.dim[1], p.dim[2], p.dim[3], 0.5)
    love.graphics.setLineWidth(1)
    love.graphics.line(0, rh, sw, rh)

end

return HUD