## ----include = FALSE----------------------------------------------------------
knitr::opts_chunk$set(
  eval = nzchar(Sys.getenv("VIGNETTES")), # Only compile locally
  collapse = TRUE,
  comment = "#>",
  fig.width = 8,
  fig.height = 5,
  out.width = "100%"
)
# Okabe-Ito colours for discrete scales
options(
  ggplot2.discrete.colour = c("#D55E00", "#0072B2", "#009E73", "#CC79A7", "#E69F00", "#56B4E9", "#F0E442"),
  ggplot2.discrete.fill = c("#D55E00", "#0072B2", "#009E73", "#CC79A7", "#E69F00", "#56B4E9", "#F0E442")
)

## ----setup, message = FALSE, warning = FALSE----------------------------------
# library(vital)
# library(fable)
# library(dplyr)
# library(ggplot2)
# set.seed(2025)

## ----mortality, fig.cap="", fig.alt="First two components of the functional data model for mortality rates."----
# fit_mortality <- norway_mortality |>
#   filter(Sex != "Total") |>
#   smooth_mortality(Mortality) |>
#   make_pr(.smooth) |>
#   model(fdm = FDM(log(.smooth), coherent = TRUE))
# autoplot(fit_mortality, 2)

## ----fertility, fig.cap="", fig.alt = "Fitted values of the functional mean model for fertility rates."----
# fit_fertility <- norway_fertility |>
#   filter(Year > 2010) |>
#   smooth_fertility(Fertility) |>
#   model(fmean = FMEAN(sqrt(.smooth)))
# autoplot(fit_fertility)

## ----migration, fig.cap="", fig.alt="First two components of the functional data model for net migration."----
# netmig <- net_migration(
#   norway_mortality |> filter(Sex != "Total"),
#   norway_births
# ) |>
#   make_sd(NetMigration)
# fit_migration <- netmig |>
#   model(fdm = FDM(NetMigration, coherent = TRUE))
# autoplot(fit_migration)

## ----simulation---------------------------------------------------------------
# pop <- norway_mortality |>
#   filter(Sex != "Total", Year == max(Year))
# future <- generate_population(
#   starting_population = pop,
#   mortality_model = fit_mortality,
#   fertility_model = fit_fertility,
#   migration_model = fit_migration,
#   h = 10,
#   n_reps = 500
# )

## ----population_plot, fig.cap="", fig.alt="Simulated population for the first replicate."----
# future |>
#   filter(.rep == "100") |>
#   ggplot(aes(x = Age, y = Population, group = Year, color = Year)) +
#   geom_line(
#     data = norway_mortality |> filter(Year > 2010, Sex != "Total"),
#     color = "grey",
#     mapping = aes(group = Year)
#   )  +
#   geom_line() +
#   scale_color_gradientn(colours = rainbow(10)[1:9]) +
#   facet_grid(. ~ Sex)

## ----mean_age-----------------------------------------------------------------
# future |>
#   group_by(Sex, .rep) |>
#   summarise(mean_age = sum(Population * (Age + 0.5)) / sum(Population)) |>
#   group_by(Sex) |>
#   summarise(mean_age = mean(mean_age))

## ----population_pyramid, fig.cap="", fig.alt="Population pyramid for 2032 with 95% prediction intervals."----
# pyramid_2032 <- future |>
#   filter(Year == 2032) |>
#   mutate(Population = if_else(Sex == "Female", -Population, Population)) |>
#   group_by(Age, Sex) |>
#   summarise(
#     lo = quantile(Population, 0.025),
#     med = quantile(Population, 0.5),
#     hi = quantile(Population, 0.975)
#   )
# pyramid_2032 |>
#   ggplot(aes(x = Age)) +
#   geom_ribbon(aes(ymin = lo, ymax = hi, colour = NULL),
#     fill = "#c14b14", alpha = 0.2
#   ) +
#   geom_line(aes(y = med), color = "#c14b14") +
#   facet_grid(. ~ Sex, scales = "free_x") +
#   labs(y = "Population") +
#   coord_flip() +
#   guides(fill = "none", alpha = "none")