---
# Every task here is guarded by `when: not bitcoind_binary_exists.stat.exists`,
# so on a host that already has the binary the whole download / verify / build
# sequence skips — including the two `state: absent` deletions, which target
# /opt/bitcoin-knots/{source,bitcoin-<version>} and never the chain data in
# /mnt/knots_data.
- name: Check if bitcoind binary already exists
  stat:
    path: "{{ bitcoin_build_prefix }}/bin/bitcoind"
  register: bitcoind_binary_exists
  changed_when: false

- name: Install gnupg for signature verification
  apt:
    name: gnupg
    state: present
  when: not bitcoind_binary_exists.stat.exists

- name: Import Luke Dashjr's Bitcoin Knots signing key
  command: gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys 90C8019E36C2E964
  register: key_import
  changed_when: "'already in secret keyring' not in key_import.stdout and 'already in public keyring' not in key_import.stdout"
  when: not bitcoind_binary_exists.stat.exists
  failed_when: key_import.rc != 0

- name: Display imported key fingerprint
  command: gpg --fingerprint 90C8019E36C2E964
  register: key_fingerprint
  changed_when: false
  when: not bitcoind_binary_exists.stat.exists

- name: Download SHA256SUMS file
  get_url:
    url: "https://bitcoinknots.org/files/{{ bitcoin_version_major }}.x/{{ bitcoin_knots_version_short }}/SHA256SUMS"
    dest: "/tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS"
    mode: '0644'
  when: not bitcoind_binary_exists.stat.exists

- name: Download SHA256SUMS.asc signature file
  get_url:
    url: "https://bitcoinknots.org/files/{{ bitcoin_version_major }}.x/{{ bitcoin_knots_version_short }}/SHA256SUMS.asc"
    dest: "/tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS.asc"
    mode: '0644'
  when: not bitcoind_binary_exists.stat.exists

- name: Verify PGP signature on SHA256SUMS file
  command: gpg --verify /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS.asc /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS
  register: sha256sums_verification
  changed_when: false
  failed_when: false  # Don't fail here - check for 'Good signature' in next task
  when: not bitcoind_binary_exists.stat.exists


- name: Display SHA256SUMS verification result
  debug:
    msg: "{{ sha256sums_verification.stdout_lines + sha256sums_verification.stderr_lines }}"
  when: not bitcoind_binary_exists.stat.exists

- name: Fail if SHA256SUMS signature verification failed
  fail:
    msg: "SHA256SUMS signature verification failed. Aborting build."
  when: not bitcoind_binary_exists.stat.exists and ('Good signature' not in sha256sums_verification.stdout and 'Good signature' not in sha256sums_verification.stderr)

- name: Remove any existing tarball to force fresh download
  file:
    path: /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
    state: absent
  when: not bitcoind_binary_exists.stat.exists

- name: Download Bitcoin Knots source tarball
  get_url:
    url: "{{ bitcoin_source_tarball_url }}"
    dest: "/tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz"
    mode: '0644'
    validate_certs: yes
    force: yes
  when: not bitcoind_binary_exists.stat.exists

- name: Calculate SHA256 checksum of downloaded tarball
  command: sha256sum /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
  register: tarball_checksum
  changed_when: false
  when: not bitcoind_binary_exists.stat.exists

- name: Extract expected checksum from SHA256SUMS file
  shell: grep "bitcoin-{{ bitcoin_knots_version_short }}.tar.gz" /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS | awk '{print $1}'
  register: expected_checksum
  changed_when: false
  when: not bitcoind_binary_exists.stat.exists
  failed_when: expected_checksum.stdout == ""

- name: Display checksum comparison
  debug:
    msg:
      - "Expected: {{ expected_checksum.stdout | trim }}"
      - "Actual: {{ tarball_checksum.stdout.split()[0] }}"
  when: not bitcoind_binary_exists.stat.exists

- name: Verify tarball checksum matches SHA256SUMS
  fail:
    msg: "Tarball checksum mismatch! Expected {{ expected_checksum.stdout | trim }}, got {{ tarball_checksum.stdout.split()[0] }}"
  when: not bitcoind_binary_exists.stat.exists and expected_checksum.stdout | trim != tarball_checksum.stdout.split()[0]

- name: Remove existing source directory if it exists (to force fresh extraction)
  file:
    path: "{{ bitcoin_knots_source_dir }}"
    state: absent
  when: not bitcoind_binary_exists.stat.exists

- name: Remove extracted directory if it exists (from previous runs)
  file:
    path: "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}"
    state: absent
  when: not bitcoind_binary_exists.stat.exists

- name: Extract verified source tarball
  unarchive:
    src: /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
    dest: "{{ bitcoin_knots_dir }}"
    remote_src: yes
  when: not bitcoind_binary_exists.stat.exists

- name: Check if extracted directory exists
  stat:
    path: "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}"
  register: extracted_dir_stat
  changed_when: false
  when: not bitcoind_binary_exists.stat.exists

- name: Rename extracted directory to expected name
  command: mv "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}" "{{ bitcoin_knots_source_dir }}"
  when: not bitcoind_binary_exists.stat.exists and extracted_dir_stat.stat.exists

- name: Check if CMakeLists.txt exists
  stat:
    path: "{{ bitcoin_knots_source_dir }}/CMakeLists.txt"
  register: cmake_exists
  changed_when: false
  when: not bitcoind_binary_exists.stat.exists

- name: Create CMake build directory
  file:
    path: "{{ bitcoin_knots_source_dir }}/build"
    state: directory
    mode: '0755'
  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)

- name: Configure Bitcoin Knots build with CMake
  command: >
    cmake
    -DCMAKE_INSTALL_PREFIX={{ bitcoin_build_prefix }}
    -DBUILD_BITCOIN_WALLET=OFF
    -DCMAKE_BUILD_TYPE=Release
    -DWITH_ZMQ=ON
    ..
  args:
    chdir: "{{ bitcoin_knots_source_dir }}/build"
  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
  register: configure_result
  changed_when: true

- name: Verify CMake enabled ZMQ
  shell: |
    set -e
    cd "{{ bitcoin_knots_source_dir }}/build"
    cmake -LAH .. | grep -iE 'ZMQ|WITH_ZMQ|ENABLE_ZMQ|USE_ZMQ'
  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
  register: zmq_check
  changed_when: false

- name: Fail if CMakeLists.txt not found
  fail:
    msg: "CMakeLists.txt not found in {{ bitcoin_knots_source_dir }}. Cannot build Bitcoin Knots."
  when: not bitcoind_binary_exists.stat.exists and not (cmake_exists.stat.exists | default(false))

- name: Build Bitcoin Knots with CMake (this may take 30-60+ minutes)
  command: cmake --build . -j{{ bitcoin_build_jobs }}
  args:
    chdir: "{{ bitcoin_knots_source_dir }}/build"
  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
  async: 3600
  poll: 0
  register: build_result
  changed_when: true

- name: Check build status
  async_status:
    jid: "{{ build_result.ansible_job_id }}"
  register: build_job_result
  until: build_job_result.finished
  retries: 120
  delay: 60
  when: not bitcoind_binary_exists.stat.exists and build_result.ansible_job_id is defined

- name: Fail if build failed
  fail:
    msg: "Bitcoin Knots build failed: {{ build_job_result.msg }}"
  when: not bitcoind_binary_exists.stat.exists and build_result.ansible_job_id is defined and build_job_result.failed | default(false)

- name: Install Bitcoin Knots binaries
  command: cmake --install .
  args:
    chdir: "{{ bitcoin_knots_source_dir }}/build"
  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
  changed_when: true

- name: Verify bitcoind binary exists
  stat:
    path: "{{ bitcoin_build_prefix }}/bin/bitcoind"
  register: bitcoind_installed
  changed_when: false

- name: Verify bitcoin-cli binary exists
  stat:
    path: "{{ bitcoin_build_prefix }}/bin/bitcoin-cli"
  register: bitcoin_cli_installed
  changed_when: false

- name: Fail if binaries not found
  fail:
    msg: "Bitcoin Knots binaries not found after installation"
  when: not bitcoind_installed.stat.exists or not bitcoin_cli_installed.stat.exists