#!/usr/bin/env bats
# tests/unit/adopt.bats — Non-destructive adoption merge tests

setup() {
  export JOSH_SYNC_ROOT="$(cd "$BATS_TEST_DIRNAME/../.." && pwd)"
  source "$JOSH_SYNC_ROOT/lib/core.sh"
  source "$JOSH_SYNC_ROOT/lib/adopt.sh"

  TEST_ROOT="$(mktemp -d)"
  export BOT_NAME="test-bot"
  export BOT_EMAIL="test-bot@test.local"
  export BOT_TRAILER="Josh-Sync-Origin"
  export JOSH_SYNC_TARGET_NAME="example"
  export SYNC_BRANCH_MONO="main"
  export SYNC_BRANCH_SUBREPO="main"
}

teardown() {
  rm -rf "$TEST_ROOT"
}

make_bare_repo() {
  local name="$1"
  local content="$2"
  local message="$3"
  local work="${TEST_ROOT}/${name}-work"
  local bare="${TEST_ROOT}/${name}.git"

  git init "$work" >/dev/null
  git -C "$work" checkout -b main >/dev/null
  git -C "$work" config user.name "Test User"
  git -C "$work" config user.email "test@test.local"
  printf '%s\n' "$content" > "${work}/README.md"
  git -C "$work" add README.md
  git -C "$work" commit -m "$message" >/dev/null

  git init --bare "$bare" >/dev/null
  git -C "$work" remote add origin "$bare"
  git -C "$work" push origin main >/dev/null
  printf '%s\n' "$bare"
}

subrepo_auth_url() {
  printf '%s\n' "$SUBREPO_BARE"
}

josh_auth_url() {
  printf '%s\n' "$JOSH_BARE"
}

@test "adopt_branch creates merge with josh head first parent and subrepo head second parent" {
  SUBREPO_BARE="$(make_bare_repo subrepo "same tree" "subrepo history")"
  JOSH_BARE="$(make_bare_repo josh "same tree" "josh filtered history")"

  local old_subrepo_head josh_head josh_tree result adopt_head
  old_subrepo_head=$(git --git-dir="$SUBREPO_BARE" rev-parse main)
  josh_head=$(git --git-dir="$JOSH_BARE" rev-parse main)
  josh_tree=$(git --git-dir="$JOSH_BARE" rev-parse 'main^{tree}')

  result=$(adopt_branch)

  [ "$result" = "adopted" ]
  adopt_head=$(git --git-dir="$SUBREPO_BARE" rev-parse main)
  [ "$adopt_head" != "$old_subrepo_head" ]
  [ "$(git --git-dir="$SUBREPO_BARE" rev-parse 'main^1')" = "$josh_head" ]
  [ "$(git --git-dir="$SUBREPO_BARE" rev-parse 'main^2')" = "$old_subrepo_head" ]
  [ "$(git --git-dir="$SUBREPO_BARE" rev-parse 'main^{tree}')" = "$josh_tree" ]
}

@test "adopt_branch aborts when trees differ and leaves subrepo head unchanged" {
  SUBREPO_BARE="$(make_bare_repo subrepo "subrepo tree" "subrepo history")"
  JOSH_BARE="$(make_bare_repo josh "josh tree" "josh filtered history")"

  local old_subrepo_head result
  old_subrepo_head=$(git --git-dir="$SUBREPO_BARE" rev-parse main)

  result=$(adopt_branch)

  [ "$result" = "tree-mismatch" ]
  [ "$(git --git-dir="$SUBREPO_BARE" rev-parse main)" = "$old_subrepo_head" ]
}

@test "adopt_branch reports missing subrepo branch before cloning" {
  SUBREPO_BARE="$(make_bare_repo subrepo "same tree" "subrepo history")"
  JOSH_BARE="$(make_bare_repo josh "same tree" "josh filtered history")"
  export SYNC_BRANCH_SUBREPO="missing"

  local result
  result=$(adopt_branch)

  [ "$result" = "missing-branch" ]
}