local charts = require("__factorio-charts__.charts")

-- Initialize (call once in on_init)
local surface_data = charts.surface.create("my-analytics")

-- Allocate a chunk for rendering
local chunk = charts.surface.allocate_chunk(surface_data)

-- Render a line graph
local ordered_sums, line_ids = charts.render.line_graph(surface_data.surface, chunk, {
    data = ring_buffer,           -- Array of {[series_name]: value}
    index = current_index,        -- Current position in ring buffer
    length = buffer_length,       -- Ring buffer capacity
    counts = sample_counts,       -- {[series_name]: count}
    sum = series_sums,            -- {[series_name]: total}
    y_range = {0, 100},           -- Optional fixed range (nil for auto-scale)
    label_format = "percent",     -- "percent", "time", or function(value) -> string
    selected_series = nil,        -- Filter: nil=all, {[name]: false}=hide
    ttl = 360,                    -- Render lifetime in ticks
})

-- Render a stacked bar chart
local line_ids = charts.render.stacked_bars(surface_data.surface, chunk, {
    deliveries = delivery_data,   -- Array of phase timing objects
    phase_colors = {              -- Color per phase
        loading = {r=0, g=1, b=0},
        travel = {r=0, g=0, b=1},
    },
    phase_order = {"loading", "travel"},  -- Stack order (bottom to top)
    ttl = 360,
})

-- Free chunk when done
charts.surface.free_chunk(surface_data, chunk)

-- Calculate camera parameters for resolution-independent display
local camera = charts.surface.get_camera_params(chunk, {
    widget_width = 900,
    widget_height = 700,
})

-- Create camera widget
local camera_widget = parent.add{
    type = "camera",
    position = camera.position,
    surface_index = surface_data.surface.index,
    zoom = camera.zoom,
}