#!/usr/bin/env nu
# Compare a deterministic agent workflow with native Git. Fail on every difference.
def main [component: path] {
 let component = ($component | path expand)
 let wit = (^wasm-tools component wit $component | complete)
 if $wit.exit_code != 0 {error make {msg: $wit.stderr}}
 let imports = ($wit.stdout | lines | str trim | where {|line| $line | str starts-with 'import '})
 let forbidden = ($imports | where {|line| not ($line | str starts-with 'import wasi:')})
 if ($imports | is-empty) or not ($forbidden | is-empty) {error make {msg: $'Unexpected component imports: ($imports)'}}
 print 'Component imports: PASS (WASI only)'
 print ($imports | str join (char newline))
 let root = (mktemp -d -p /tmp/p1-git workflow.XXXXXX)
 print $'Fixture: ($root)'
 let envs = {GIT_AUTHOR_NAME: 'Agent', GIT_AUTHOR_EMAIL: 'agent@example.test', GIT_COMMITTER_NAME: 'Agent', GIT_COMMITTER_EMAIL: 'agent@example.test', GIT_AUTHOR_DATE: '1700000000 +0000', GIT_COMMITTER_DATE: '1700000000 +0000', GIT_CONFIG_NOSYSTEM: '1', GIT_EDITOR: 'true', HOME: '/tmp/p1-git/empty-home', LC_ALL: 'C', TZ: 'UTC'}
 mkdir $envs.HOME
 with-env $envs {
  for side in [native wasi] { mkdir ($root | path join $side repo) }
  let steps = [
   {args: [init -q -b main], compare: true}
   {args: [config user.name Agent], compare: true}
   {args: [config user.email agent@example.test], compare: true}
   {args: [-c user.name=Override config --get user.name], compare: true}
   {args: [config --get user.name], compare: true}
   {write: 'base\n', file: 'file.txt'}
   {args: [add .], compare: true}
   {args: [commit -m initial], compare: true}
   {args: [status --short], compare: true}
   {args: [status -sb], compare: true}
   {args: [status --porcelain=v1], compare: true}
   {args: [status], compare: true}
   {args: [ls-files], compare: true}
   {args: [branch --show-current], compare: true}
   {args: [branch -a], compare: true}
   {args: [log -n 1], compare: true}
   {args: [log -n 1 '--format=%H %h %s %an %ae %ad %d'], compare: true}
   {args: [log -n 1 '--pretty=format:%H %h %s %an %ae %ad %d'], compare: true}
   {args: [log -n 1 -p], compare: true}
   {args: [log -n 1 --stat], compare: true}
   {args: [log --oneline -- file.txt], compare: true}
   {args: [show --stat], compare: true}
   {args: [rev-parse --short HEAD], compare: true}
   {args: [show HEAD], compare: true}
   {args: [show HEAD:file.txt], compare: true}
   {args: [branch topic], compare: true}
   {args: [switch topic], compare: true}
   {write: 'topic\n', file: 'topic.txt'}
   {args: [add .], compare: true}
   {args: [commit -m topic], compare: true}
   {args: [rev-parse HEAD HEAD~1], compare: true}
   {args: [diff HEAD~1], compare: true}
   {args: [diff HEAD~1..HEAD], compare: true}
   {args: [diff --name-only HEAD~1..HEAD], compare: true}
   {args: [diff --name-status HEAD~1..HEAD], compare: true}
   {args: [diff HEAD~1 -- topic.txt], compare: true}
   {args: [branch disposable], compare: true}
   {args: [branch -d disposable], compare: true}
   {args: [branch disposable], compare: true}
   {args: [branch -D disposable], compare: true}
   {args: [branch disposable], compare: true}
   {args: [branch -q -d disposable], compare: true}
   {args: [switch main], compare: true}
   {args: [merge topic], compare: true}
   {write: 'changed\n', file: 'file.txt'}
   {args: [status --short], compare: true}
   {args: [diff], compare: true}
   {args: [diff --stat], compare: true}
   {args: [status], compare: true}
   {args: [commit -am changed], compare: true}
   {args: [log --oneline], compare: true}
   {args: [switch topic], compare: true}
   {write: 'conflict\n', file: 'file.txt'}
   {args: [commit -am conflict], compare: true}
   {args: [switch main], compare: true}
   {args: [merge topic], compare: true, exit: 1}
   {args: [status --short], compare: true}
   {args: [merge --abort], compare: true}
   {args: [merge -q topic], compare: true, exit: 1}
   {args: [merge --abort], compare: true}
   {args: [worktree add -b linked ../linked], compare: true}
   {args: [worktree list], compare: false}
   {args: [worktree remove ../linked], compare: true}
   {args: [switch topic], compare: true}
   {args: [rebase main], compare: true, exit: 1}
   {write: 'resolved\n', file: 'file.txt'}
   {args: [add file.txt], compare: true}
   {args: [rebase --continue], compare: true}
   {args: [rebase -q main], compare: true}
   {args: [log --oneline], compare: true}
   {args: [switch main], compare: true}
   {write: 'left\n', file: 'left.txt'}
   {args: [add .], compare: true}
   {args: [commit -m left], compare: true}
   {args: [switch topic], compare: true}
   {write: 'right\n', file: 'right.txt'}
   {args: [add .], compare: true}
   {args: [commit -m right], compare: true}
   {args: [switch main], compare: true}
   {args: [merge topic], compare: true}
   {args: [show HEAD], compare: true}
   {args: [branch], compare: true}
   {args: [rm right.txt], compare: true}
   {args: [diff --cached], compare: true}
   {args: [status --porcelain], compare: true}
   {args: [commit -m removed], compare: true}
   {args: [checkout HEAD~1], compare: true}
   {args: [status], compare: true}
   {args: [status -sb], compare: true}
   {args: [switch main], compare: true}
   {args: [checkout -q -b agent-checkout], compare: true}
   {args: [switch -q main], compare: true}
   {args: [switch -q -c agent-switch], compare: true}
   {write: 'agent\n', file: 'agent.txt'}
   {args: [add agent.txt], compare: true}
   {args: [commit -q -m agent], compare: true}
   {args: [switch main], compare: true}
   {args: [merge --no-ff -q agent-switch], compare: true}
   {args: [show --stat], compare: true}
   {args: [commit --quiet --allow-empty -m quiet], compare: true}
   {args: [init], compare: true, normalize_path: true, state: true}
   {args: [init -q], compare: true, state: true}
   {args: [log -n 1 --oneline -- file.txt], compare: true}
   {args: [log -n 2 --oneline -- file.txt], compare: true}
   {args: [config branch.main.description agent-branch], compare: true}
   {args: [branch -m rework], compare: true, state: true}
   {args: [config --get branch.rework.description], compare: true}
   {args: [branch -m agent-checkout renamed], compare: true, state: true}
   {args: [branch], compare: true}
   {args: [remote add example https://example.test/repo.git], compare: true, state: true}
   {args: [remote -v], compare: true}
   {args: [remote set-url example https://example.test/new.git], compare: true, state: true}
   {args: [remote get-url example], compare: true}
   {args: [remote remove example], compare: true, state: true}
   {args: [remote -v], compare: true}
   {args: [tag lightweight], compare: true, state: true}
   {args: [tag -a annotated -m annotation], compare: true, state: true}
   {args: [tag], compare: true}
   {args: [tag --list], compare: true}
   {args: [tag -d annotated], compare: true, state: true}
   {args: [tag -d lightweight], compare: true, state: true}
   {write: 'amended\n', file: 'agent.txt'}
   {args: [add agent.txt], compare: true}
   {args: [commit --amend -m amended], compare: true, state: true}
   {args: [commit --amend --no-edit], compare: true, state: true}
   {write: 'file message\n\nbody\n', file: 'message.txt'}
   {write: 'from-file\n', file: 'agent.txt'}
   {args: [add agent.txt], compare: true}
   {args: [commit -F message.txt], compare: true, state: true}
   {write: 'dirty\n', file: 'agent.txt'}
   {args: [checkout agent.txt], compare: true, state: true}
   {write: 'dirty\n', file: 'agent.txt'}
   {args: [checkout -- agent.txt], compare: true, state: true}
   {write: 'dirty\n', file: 'agent.txt'}
   {args: [restore agent.txt], compare: true, state: true}
   {write: 'staged\n', file: 'agent.txt'}
   {args: [add agent.txt], compare: true}
   {args: [restore --staged agent.txt], compare: true, state: true}
   {args: [status --short], compare: true}
   {args: [restore agent.txt], compare: true, state: true}
   {write: 'staged\n', file: 'agent.txt'}
   {args: [add agent.txt], compare: true}
   {args: [reset HEAD agent.txt], compare: true, state: true}
   {args: [restore agent.txt], compare: true, state: true}
   {args: [branch saved], compare: true}
   {args: [reset --soft HEAD~1], compare: true, state: true}
   {args: [status --short], compare: true}
   {args: [log --oneline -n 2], compare: true}
   {args: [reset --hard saved], compare: true, state: true}
   {args: [reset HEAD~1], compare: true, state: true}
   {args: [status --short], compare: true}
   {args: [reset --hard saved], compare: true, state: true}
   {args: [reset --hard HEAD~1], compare: true, state: true}
   {args: [reset --hard saved], compare: true, state: true}
   {write: 'stash one\n', file: 'agent.txt'}
   {args: [stash push], compare: true, state: true}
   {args: [stash list], compare: true}
   {args: [stash bogus], compare: true, exit: 128, state: true}
   {args: [stash apply], compare: true, state: true}
   {args: [reset --hard], compare: true, state: true}
   {args: [stash drop], compare: true, state: true}
   {write: 'stash two\n', file: 'agent.txt'}
   {args: [stash -m custom], compare: true, state: true}
   {args: [stash list], compare: true}
   {write: 'stash three\n', file: 'agent.txt'}
   {args: [stash], compare: true, state: true}
   {args: [stash list], compare: true}
   {args: [stash drop], compare: true, state: true}
   {args: [stash pop], compare: true, state: true}
   {args: [status --short], compare: true}
   {args: [reset --hard], compare: true, state: true}
   {args: [stash push], compare: true, state: true}
   {write: 'added stash\n', file: 'stash-added.txt'}
   {args: [add stash-added.txt], compare: true}
   {write: 'stage stash\n', file: 'agent.txt'}
   {args: [add agent.txt], compare: true}
   {write: 'unstaged stash\n', file: 'agent.txt'}
   {args: [stash push -m staged], compare: true, state: true}
   {args: [stash apply], compare: true, state: true}
   {args: [status --short], compare: true}
   {args: [reset --hard], compare: true, state: true}
   {args: [stash drop], compare: true, state: true}
   {write: 'quiet stash\n', file: 'agent.txt'}
   {args: [stash push -q -m quiet], compare: true, state: true}
   {args: [stash pop -q], compare: true, state: true}
   {args: [stash push -q], compare: true, state: true}
   {args: [stash drop -q], compare: true, state: true}
   {args: [stash push -q], compare: true, state: true}
   {args: [switch -c picks], compare: true}
   {write: 'picked\n', file: 'pick.txt'}
   {args: [add pick.txt], compare: true}
   {args: [commit -m picked], compare: true}
   {args: [switch rework], compare: true}
   {args: [cherry-pick picks], compare: true, state: true}
   {args: [log --oneline -n 2], compare: true}
   {args: [switch picks], compare: true}
   {write: 'theirs\n', file: 'agent.txt'}
   {args: [commit -am theirs], compare: true}
   {args: [switch rework], compare: true}
   {write: 'ours\n', file: 'agent.txt'}
   {args: [commit -am ours], compare: true}
   {args: [cherry-pick picks], compare: true, exit: 1, state: true}
   {args: [status --short], compare: true}
   {args: [cherry-pick --abort], compare: true, state: true}
   {args: [cherry-pick picks], compare: true, exit: 1, state: true}
   {write: 'resolved\n', file: 'agent.txt'}
   {args: [add agent.txt], compare: true}
   {args: [cherry-pick --continue], compare: true, state: true}
   {args: [log --oneline -n 3], compare: true}
   {args: [status --short], compare: true}
   {args: [cherry-pick --abort], compare: true, exit: 128, state: true}
   {args: [status --bad-option], compare: true, exit: 129}
   {args: [not-a-command], compare: true, exit: 1}
  ]
  mut failures = 0
  for step in $steps {
   if 'write' in $step {
    for side in [native wasi] { $step.write | str replace --all '\n' (char newline) | save --force ($root | path join $side repo $step.file) }
    continue
   }
   let args = $step.args
   let native = (^git -C ($root | path join native repo) ...$args | complete)
   let wasi = (^wasmtime run -S http=y -S cli-exit-with-code=y --dir $'($root)/wasi::/' --env GIT_AUTHOR_NAME --env GIT_AUTHOR_EMAIL --env GIT_COMMITTER_NAME --env GIT_COMMITTER_EMAIL --env GIT_AUTHOR_DATE --env GIT_COMMITTER_DATE $component -C /repo ...$args | complete)
   let expected = ($step.exit? | default 0)
   let native_stdout = if ($step.normalize_path? | default false) { $native.stdout | str replace --all ($root | path join native repo) '/repo' } else { $native.stdout }
   let equal = ($native.exit_code == $expected and $wasi.exit_code == $expected and (not $step.compare or $native_stdout == $wasi.stdout))
   print $'($args | str join " "): (if $equal {"PASS"} else {"FAIL"}) native=($native.exit_code) wasi=($wasi.exit_code)'
   if not $equal {
    $failures += 1
    print ({native: $native, wasi: $wasi} | to json)
   }
   if ($step.state? | default false) {
    for check in [[status --short] [log '--format=%H %P %an %ae %s' --all] [diff] [diff --cached] [show-ref] [config --get-regexp '^(branch|remote)\.']] {
     let native_state = (^git -C ($root | path join native repo) ...$check | complete)
     let wasi_state = (^git -C ($root | path join wasi repo) ...$check | complete)
     let same = ($native_state.exit_code == $wasi_state.exit_code and $native_state.stdout == $wasi_state.stdout)
     print $'  state ($check | str join " "): (if $same {"PASS"} else {"FAIL"})'
     if not $same { $failures += 1; print ({native: $native_state, wasi: $wasi_state} | to json) }
    }
   }
  }
  # Explicit usage checks for documented forms that this CLI does not implement.
  let unsupported = [
   [log --graph --oneline --all]
  ]
  for args in $unsupported {
   let result = (^wasmtime run -S http=y -S cli-exit-with-code=y --dir $'($root)/wasi::/' $component -C /repo ...$args | complete)
   let expected = 129
   let equal = ($result.exit_code == $expected and $result.stdout == '' and ($result.stderr | str lowercase | str contains 'usage'))
   print $'($args | str join " "): (if $equal {"PASS documented usage"} else {"FAIL documented usage"}) wasi=($result.exit_code)'
   if not $equal { $failures += 1; print ($result | to json) }
  }
  # WASI checkout and staging retain an existing executable file's indexed mode.
  let executable = ($root | path join executable)
  mkdir $executable
  ^git -C $executable init -q -b main
  "#!/bin/sh\necho executable\n" | save ($executable | path join run.sh)
  ^chmod +x ($executable | path join run.sh)
  ^git -C $executable add run.sh
  ^git -C $executable commit --no-gpg-sign -q -m executable
  rm ($executable | path join run.sh)
  mut executable_ok = true
  for args in [[checkout -q HEAD -- run.sh] [status --short] [diff] [add run.sh] [diff --cached] [status --short]] {
   let result = (^wasmtime run -S http=y -S cli-exit-with-code=y --dir $'($executable)::/mode' $component -C /mode ...$args | complete)
   if $result.exit_code != 0 or $result.stdout != '' { $executable_ok = false; print ($result | to json) }
  }
  let indexed = (^git -C $executable ls-files --stage run.sh | complete)
  $executable_ok = ($executable_ok and $indexed.exit_code == 0 and ($indexed.stdout | str starts-with '100755 '))
  print $'executable checkout stays clean: (if $executable_ok {"PASS"} else {"FAIL"})'
  if not $executable_ok { $failures += 1 }
  # A merge tree that differs from both parents requires a combined diff.
  'combined resolution\n' | save --force ($root | path join native/repo/file.txt)
  let native = ($root | path join native/repo)
  ^git -C $native add file.txt
  let tree = (^git -C $native write-tree | str trim)
  let merge = (^git -C $native commit-tree $tree -p HEAD -p HEAD~1 -m combined | str trim)
  let result = (^wasmtime run -S http=y -S cli-exit-with-code=y --dir $'($root)/native/repo::/combined' $component -C /combined show $merge | complete)
  let native_result = (^git -C $native show $merge | complete)
  let equal = ($native_result.exit_code == 0 and $result.exit_code == 129 and $result.stdout == '' and ($result.stderr | str contains 'usage'))
  print $'show combined merge: (if $equal {"PASS documented usage"} else {"FAIL documented usage"}) native=($native_result.exit_code) wasi=($result.exit_code)'
  if not $equal { $failures += 1; print ($result | to json) }
  if $failures > 0 {error make {msg: $'($failures) workflow comparisons failed'}}
 }
}