#!/usr/bin/env ruby
# encoding: UTF-8
# frozen_string_literal: true

# verify-intent (intent 213) - bundles the checks that need no project-specific knowledge
# into one verdict: the per-intent doctor scan, an added-line em-dash diff guard, a
# diffstat, and an optional caller-supplied suite command.
#
# Usage:
#   verify-intent --store <path> --id <intent_id> [--base <ref>] [--suite <command>]
#
# --base overrides the auto-detected diff base (default: the merge base with the repo's
# detected default branch) for repos where detection is ambiguous. --suite is an optional
# caller-supplied command to run (in the repo directory) and fold into the verdict. No
# other flags exist.
#
# Checks, all run every invocation (the fourth only when --suite is given):
#   1. doctor    - Doctor#run_intent_check(id, store: scope), fail-open on a crash
#   2. em-dash   - added lines only of `git diff <base>...HEAD`, never the whole tree
#   3. diffstat  - `git diff --stat <base>...HEAD`, never a failure on its own
#   4. suite     - the supplied --suite command, run with RUBYOPT cleared
#
# Every check runs, then the run exits on the LOWEST-numbered failure that occurred, so one
# invocation gives the full picture on stdout even when several checks fail.
#
# Exit codes:
#   0  every check passed
#   1  usage or path-resolution failure
#   2  doctor reported an issue
#   3  the em-dash guard found a violation on an added line
#   4  the supplied --suite command exited non-zero

require_relative "lib/verify_intent"

def parse_args(argv)
  opts = { store: nil, id: nil, base: nil, suite: nil }
  i = 0
  while i < argv.length
    arg = argv[i]
    case arg
    when "--store" then opts[:store] = argv[i += 1]
    when "--id"    then opts[:id] = argv[i += 1]
    when "--base"  then opts[:base] = argv[i += 1]
    when "--suite" then opts[:suite] = argv[i += 1]
    else
      usage_abort("unknown argument #{arg.inspect}")
    end
    i += 1
  end
  opts
end

def usage
  "usage: verify-intent --store <path> --id <intent_id> [--base <ref>] [--suite <command>]"
end

def usage_abort(message)
  warn "verify-intent: #{message}"
  warn usage
  exit 1
end

def main(argv)
  opts = parse_args(argv)
  usage_abort("--store is required") if opts[:store].nil? || opts[:store].empty?
  usage_abort("--id is required") if opts[:id].nil? || opts[:id].empty?

  verdict = VerifyIntent.run(store: opts[:store], id: opts[:id], base: opts[:base], suite: opts[:suite])
  verdict[:lines].each { |line| puts line }
  exit verdict[:exit_code]
end

main(ARGV) if $PROGRAM_NAME == __FILE__