#!/usr/bin/env bash
# deploy.yml › detect — decide what this push deploys.
#
# A side deploys when its folder's tree hash differs from the hash last deployed SUCCESSFULLY to
# this environment (stored on the server in /opt/erpcore/<env>/.deployed). So:
#   • docs / PROGRESS.md / smoke-script pushes deploy nothing,
#   • a failed deploy is retried by the next run (its stored hash never moved),
#   • force-pushes, multi-commit pushes and merges need no special handling.
# Manual runs can force a side (config change) or pin an older hash (rollback).
# shellcheck source=common.sh
source "$(dirname "${BASH_SOURCE[0]}")/common.sh"

: "${REF_NAME:?REF_NAME (the pushed branch) is required}"
env_name="$(env_for_branch "$REF_NAME")" ||
  fail "branch '$REF_NAME' is not deployable (Dev → test, production → release)"
load_env "$env_name"

be_hash="$(tree_hash "$BACKEND_PATH")"
fe_hash="$(tree_hash "$FRONTEND_PATH")"
mig_hash="$(tree_hash "$MIGRATIONS_PATH")"
[[ -n "$be_hash" && -n "$fe_hash" ]] || fail "could not compute tree hashes — is this an ERP-core checkout?"

be_rollback=false
fe_rollback=false
if [[ -n "${BACKEND_HASH_INPUT:-}" ]]; then be_hash="$BACKEND_HASH_INPUT" && be_rollback=true; fi
if [[ -n "${FRONTEND_HASH_INPUT:-}" ]]; then fe_hash="$FRONTEND_HASH_INPUT" && fe_rollback=true; fi

be_deployed="$(read_state backend)"
fe_deployed="$(read_state frontend)"
be_changed=false
fe_changed=false
if [[ "$be_hash" != "$be_deployed" ]]; then be_changed=true; fi
if [[ "$fe_hash" != "$fe_deployed" ]]; then fe_changed=true; fi

deploy_backend=$be_changed
deploy_frontend=$fe_changed
if [[ "${FORCE_BACKEND:-}" == true ]]; then deploy_backend=true; fi
if [[ "${FORCE_FRONTEND:-}" == true ]]; then deploy_frontend=true; fi

migrations_changed=false
if ! $be_rollback && [[ "$mig_hash" != "$(read_state migrations)" ]]; then migrations_changed=true; fi

# A Gitea release records real content changes on release only — not forced restarts or
# rollbacks (those are in .deployed/history.log on the server).
record_release=false
if [[ "$env_name" == release ]] && ! $be_rollback && ! $fe_rollback && { $be_changed || $fe_changed; }; then
  record_release=true
fi

log "environment $env_name — deployed now: backend ${be_deployed:-none}, frontend ${fe_deployed:-none}"
set_output env "$env_name"
set_output backend "$deploy_backend"
set_output frontend "$deploy_frontend"
set_output backend_hash "$be_hash"
set_output frontend_hash "$fe_hash"
set_output backend_rollback "$be_rollback"
set_output frontend_rollback "$fe_rollback"
set_output migrations_hash "$mig_hash"
set_output migrations_changed "$migrations_changed"
set_output record_release "$record_release"