#!/usr/bin/env nu
# install/install.nu — ontoref-daemon installer
#
# Installed layout:
#
#   ~/.local/bin/
#     ontoref              ← global CLI wrapper (install/ontoref-global)
#     ontoref-daemon       ← bootstrapper: nickel export | ontoref-daemon.bin (ADR-004)
#     ontoref-daemon.bin   ← compiled binary (not called directly)
#
# Platform data/config:
#   macOS:
#     data    ~/Library/Application Support/ontoref/   templates, public, nulib
#     config  ~/.config/ontoref/
#   Linux:
#     data    ~/.local/share/ontoref/
#     config  ~/.config/ontoref/
#
# Dev mode   (Cargo.toml present + nu in PATH): also installs ncl-bootstrap Nu helper
# Service mode: bootstrapper is the sole entrypoint — .bin never called directly

def install-if-changed [src: string, dest: string, label: string] {
  let needs_update = if ($dest | path exists) {
    (open --raw $src | hash sha256) != (open --raw $dest | hash sha256)
  } else {
    true
  }
  if $needs_update {
    cp $src $dest
    chmod +x $dest
    print $"✓ ($label)  ($dest)"
  } else {
    print $"— ($label)  unchanged"
  }
}

def main [] {
  let repo_root = $env.PWD
  let is_dev    = (("Cargo.toml" | path exists) and ((which nu | length) > 0))

  let platform = (sys host | get name)
  let is_mac   = ((^uname) == "Darwin")

  let data_dir   = if $is_mac {
    $"($env.HOME)/Library/Application Support/ontoref"
  } else {
    $"($env.HOME)/.local/share/ontoref"
  }
  let config_dir = $"($env.HOME)/.config/ontoref"
  let bin_dir    = $"($env.HOME)/.local/bin"

  mkdir $bin_dir

  # ── 1. Binary → ontoref-daemon.bin ────────────────────────────────────────
  let bin_src  = $"($repo_root)/target/release/ontoref-daemon"
  let bin_dest = $"($bin_dir)/ontoref-daemon.bin"

  if not ($bin_src | path exists) {
    error make { msg: $"binary not found: ($bin_src)\n  run: cargo build --release -p ontoref-daemon" }
  }

  # Stop any running instance — macOS kills the new process if the old one holds the file
  do { ^pkill -x ontoref-daemon.bin } | ignore
  do { ^pkill -x ontoref-daemon } | ignore

  cp $bin_src $bin_dest
  chmod +x $bin_dest

  if $is_mac {
    do { ^xattr -d com.apple.quarantine $bin_dest } | ignore
  }

  print $"✓ binary         ($bin_dest)"

  # ── 2. Bootstrapper → ontoref-daemon ──────────────────────────────────────
  # The bootstrapper IS the public entrypoint. Users call ontoref-daemon, never .bin directly.
  let boot_src  = $"($repo_root)/install/ontoref-daemon-boot"
  let boot_dest = $"($bin_dir)/ontoref-daemon"

  install-if-changed $boot_src $boot_dest "bootstrapper"

  # ── 3. Global CLI wrapper → ontoref ───────────────────────────────────────
  # Bake the repo root into the installed script so ONTOREF_ROOT resolves correctly
  # from any working directory, not just from within the source tree.
  let cli_src    = $"($repo_root)/install/ontoref-global"
  let cli_dest   = $"($bin_dir)/ontoref"
  let cli_baked  = (
    open --raw $cli_src
    | str replace 'ONTOREF_ROOT="${ONTOREF_ROOT:-ontoref}"' $'ONTOREF_ROOT="${ONTOREF_ROOT:-($repo_root)}"'
  )

  let needs_update = if ($cli_dest | path exists) {
    ($cli_baked | hash sha256) != (open --raw $cli_dest | hash sha256)
  } else {
    true
  }

  if $needs_update {
    $cli_baked | save --force $cli_dest
    chmod +x $cli_dest
    print $"✓ cli         ($cli_dest)"
  } else {
    print $"— cli         unchanged"
  }

  # ── 4. UI assets (data dir) ────────────────────────────────────────────────
  let templates_src = $"($repo_root)/crates/ontoref-daemon/templates"
  let public_src    = $"($repo_root)/crates/ontoref-daemon/public"

  if not ($templates_src | path exists) {
    error make { msg: $"templates not found: ($templates_src)" }
  }

  mkdir $data_dir

  let asset_dirs = [$templates_src $public_src]
  mut updated = 0
  mut skipped = 0

  for asset_dir in $asset_dirs {
    let dir_name = ($asset_dir | path basename)
    let dest_base = $"($data_dir)/($dir_name)"
    mkdir $dest_base
    for src_file in (glob $"($asset_dir)/**/*" | where { |f| ($f | path type) == "file" }) {
      let rel   = ($src_file | str replace $"($asset_dir)/" "")
      let dest_file = $"($dest_base)/($rel)"
      let dest_parent = ($dest_file | path dirname)
      mkdir $dest_parent
      let needs_update = if ($dest_file | path exists) {
        (open --raw $src_file | hash sha256) != (open --raw $dest_file | hash sha256)
      } else {
        true
      }
      if $needs_update {
        cp $src_file $dest_file
        $updated = $updated + 1
      } else {
        $skipped = $skipped + 1
      }
    }
  }

  print $"✓ assets         ($data_dir)/  updated=($updated) unchanged=($skipped)"

  # ── 5. Config skeleton + global NATS topology ─────────────────────────────
  let streams_default = $"($repo_root)/install/resources/streams.json"
  let streams_dest    = $"($config_dir)/streams.json"

  if ($streams_default | path exists) {
    mkdir $config_dir
    if not ($streams_dest | path exists) {
      cp $streams_default $streams_dest
      print $"✓ nats topology  ($streams_dest)"
    } else {
      print $"— nats topology  unchanged"
    }
  }

  let config_default = $"($repo_root)/install/resources/config.ncl"
  let config_dest    = $"($config_dir)/config.ncl"
  let config_example = $"($config_dir)/config.ncl.example"

  if ($config_default | path exists) {
    mkdir $config_dir
    cp $config_default $config_example

    if ($config_dest | path exists) {
      print $"ℹ config         already exists — not overwritten"
      print $"  example kept:  ($config_example)"
    } else {
      cp $config_default $config_dest
      print $"✓ config         ($config_dest)"
      print $"  edit with:     ontoref config-edit"
    }
  }

  # projects.ncl — local projects; populated by `ontoref project-add`
  let projects_default = $"($repo_root)/install/resources/projects.ncl"
  let projects_dest    = $"($config_dir)/projects.ncl"

  if ($projects_default | path exists) and not ($projects_dest | path exists) {
    cp $projects_default $projects_dest
    print $"✓ projects       ($projects_dest)"
  }

  # remote-projects.ncl — remote/push-only projects; populated by `ontoref project-add-remote`
  let remote_default = $"($repo_root)/install/resources/remote-projects.ncl"
  let remote_dest    = $"($config_dir)/remote-projects.ncl"

  if ($remote_default | path exists) and not ($remote_dest | path exists) {
    cp $remote_default $remote_dest
    print $"✓ remote-projects ($remote_dest)"
  }

  # schemas/ — project contract schemas imported by per-project .ontoref/project.ncl
  let schemas_src  = $"($repo_root)/install/resources/schemas"
  let schemas_dest = $"($config_dir)/schemas"

  if ($schemas_src | path exists) {
    mkdir $schemas_dest
    for f in (ls $schemas_src | get name) {
      let dest_f = $"($schemas_dest)/(($f | path basename))"
      if not ($dest_f | path exists) {
        cp $f $dest_f
        print $"✓ schema         ($dest_f)"
      }
    }
  }

  # ── 6. Install scripts (gen-projects.nu, etc.) ────────────────────────────
  # The bootstrapper (ontoref-daemon-boot) looks for these at $data_dir/install/
  # to validate and regenerate projects.ncl before nickel export runs.
  let install_dest = $"($data_dir)/install"
  mkdir $install_dest
  for f in (glob $"($repo_root)/install/*.nu") {
    let dest_f = $"($install_dest)/(($f | path basename))"
    install-if-changed $f $dest_f $"install/(($f | path basename))"
  }

  # ── 7. Dev extras: ncl-bootstrap Nu helper ────────────────────────────────
  if $is_dev {
    let nulib_dest = $"($data_dir)/nulib"
    mkdir $nulib_dest
    cp $"($repo_root)/reflection/nulib/bootstrap.nu" $"($nulib_dest)/bootstrap.nu"
    print $"✓ ncl-bootstrap  ($nulib_dest)/bootstrap.nu"
  }

  # ── Summary ────────────────────────────────────────────────────────────────
  let mode_tag = if $is_dev { "dev" } else { "service" }
  print $"\ninstalled  mode=($mode_tag)  platform=($platform)"
  print $"  bin     ($bin_dir)/ontoref, ontoref-daemon, ontoref-daemon.bin"
  print $"  data    ($data_dir)/"
  print $"  config  ($config_dir)/"
  print ""
  print "  next:   nu install/config-setup.nu"
}