---
# =============================================================================
# Gitea Migration Playbook
# =============================================================================
# Migrates Gitea from stuslab.cc to code.stuslab.cc with Authentik OAuth
#
# Prerequisites:
#   1. Authentik deployed at auth.stuslab.cc
#   2. DNS record: code.stuslab.cc -> 94.130.181.201
#   3. group_vars/vault.yml with authentik bootstrap token
#
# Usage:
#   ansible-playbook -i inventory.yml playbook.yml --ask-vault-pass
#
# What this playbook does:
#   1. Validates existing Gitea installation
#   2. Creates backup of gitea_data/
#   3. Updates app.ini with new domain settings
#   4. Deploys updated Caddyfile with redirect
#   5. Creates OAuth application in Authentik
#   6. Verifies migration success
# =============================================================================

- name: Migrate Gitea to code.stuslab.cc
  hosts: gitea_servers
  become: true
  vars_files:
    - group_vars/gitea_servers.yml
    - group_vars/vault.yml

  # ===========================================================================
  # Pre-flight Validation
  # ===========================================================================
  pre_tasks:
    - name: Validate required variables
      ansible.builtin.assert:
        that:
          - gitea_domain is defined
          - gitea_old_domain is defined
          - authentik_domain is defined
          - vault_authentik_bootstrap_token is defined
          - vault_authentik_bootstrap_token != "PASTE_AUTHENTIK_BOOTSTRAP_TOKEN_HERE"
        fail_msg: |
          Required variables not configured!
          1. Copy vault.yml.example to vault.yml
          2. Add your Authentik bootstrap token
          3. Encrypt with: ansible-vault encrypt group_vars/vault.yml

    - name: Check existing Gitea installation
      ansible.builtin.stat:
        path: "{{ gitea_base_dir }}/gitea_data/gitea/conf/app.ini"
      register: existing_gitea

    - name: Fail if no existing Gitea found
      ansible.builtin.fail:
        msg: |
          No existing Gitea installation found at {{ gitea_base_dir }}
          Expected app.ini at: {{ gitea_base_dir }}/gitea_data/gitea/conf/app.ini
      when: not existing_gitea.stat.exists

    - name: Display pre-flight status
      ansible.builtin.debug:
        msg: |
          ============================================
          Gitea Migration Pre-flight Check
          ============================================
          Current domain: {{ gitea_old_domain }}
          Target domain:  {{ gitea_domain }}
          Authentik:      {{ authentik_domain }}
          Base dir:       {{ gitea_base_dir }}
          ============================================

    - name: Verify Authentik is reachable
      ansible.builtin.uri:
        url: "https://{{ authentik_domain }}/api/v3/core/brands/"
        method: GET
        headers:
          Authorization: "Bearer {{ vault_authentik_bootstrap_token }}"
        status_code: 200
        timeout: 30
      register: authentik_check
      ignore_errors: true

    - name: Warn if Authentik not reachable
      ansible.builtin.debug:
        msg: |
          WARNING: Authentik not reachable at https://{{ authentik_domain }}
          OAuth setup will be skipped. You can run it manually later.
      when: authentik_check.failed

  tasks:
    # =========================================================================
    # Stage 1: Backup (skip if recent backup exists)
    # =========================================================================
    - name: Create backup directory
      ansible.builtin.file:
        path: "{{ gitea_backup_dir }}"
        state: directory
        mode: "0755"
      when: gitea_create_backup

    - name: Check for existing backup from today
      ansible.builtin.find:
        paths: "{{ gitea_backup_dir }}"
        patterns: "gitea-backup-{{ ansible_date_time.date | replace('-', '') }}*.tar.gz"
      register: existing_backups
      when: gitea_create_backup

    - name: Set backup needed flag
      ansible.builtin.set_fact:
        backup_needed: "{{ gitea_create_backup and (existing_backups.files | length == 0) }}"

    - name: Skip backup message
      ansible.builtin.debug:
        msg: "Backup already exists from today: {{ existing_backups.files[0].path | basename }}. Skipping backup."
      when:
        - gitea_create_backup
        - existing_backups.files | length > 0

    - name: Stop Gitea container for consistent backup
      ansible.builtin.command:
        cmd: docker compose stop gitea
        chdir: "{{ gitea_base_dir }}"
      when: backup_needed
      changed_when: true

    - name: Generate backup timestamp
      ansible.builtin.set_fact:
        backup_timestamp: "{{ ansible_date_time.iso8601_basic_short }}"
      when: backup_needed

    - name: Create backup archive
      ansible.builtin.archive:
        path: "{{ gitea_data_dir }}"
        dest: "{{ gitea_backup_dir }}/gitea-backup-{{ backup_timestamp }}.tar.gz"
        format: gz
      when: backup_needed

    - name: Display backup status
      ansible.builtin.debug:
        msg: "Backup created: {{ gitea_backup_dir }}/gitea-backup-{{ backup_timestamp }}.tar.gz"
      when: backup_needed

    - name: Upload backup to GDrive (if configured)
      ansible.builtin.command:
        cmd: "rclone copy {{ gitea_backup_dir }}/gitea-backup-{{ backup_timestamp }}.tar.gz GDrive:backups/gitea/"
      when:
        - backup_needed
        - gitea_backup_to_gdrive
      ignore_errors: true
      register: gdrive_upload
      changed_when: gdrive_upload.rc == 0

    # =========================================================================
    # Stage 2: Domain Migration (app.ini)
    # =========================================================================
    - name: Update app.ini ROOT_URL
      ansible.builtin.lineinfile:
        path: "{{ gitea_data_dir }}/gitea/conf/app.ini"
        regexp: '^ROOT_URL\s*='
        line: "ROOT_URL = https://{{ gitea_domain }}/"
        backup: true

    - name: Update app.ini SSH_DOMAIN
      ansible.builtin.lineinfile:
        path: "{{ gitea_data_dir }}/gitea/conf/app.ini"
        regexp: '^SSH_DOMAIN\s*='
        line: "SSH_DOMAIN = {{ gitea_ssh_domain }}"

    - name: Update app.ini DOMAIN
      ansible.builtin.lineinfile:
        path: "{{ gitea_data_dir }}/gitea/conf/app.ini"
        regexp: '^DOMAIN\s*='
        line: "DOMAIN = {{ gitea_domain }}"

    # =========================================================================
    # Stage 3: Deploy Updated Configuration
    # =========================================================================
    - name: Deploy docker-compose.yml
      ansible.builtin.template:
        src: templates/docker-compose.yml.j2
        dest: "{{ gitea_base_dir }}/docker-compose.yml"
        mode: "0644"
        backup: true

    - name: Deploy Caddyfile with domain redirect
      ansible.builtin.template:
        src: templates/Caddyfile.j2
        dest: "{{ gitea_base_dir }}/Caddyfile"
        mode: "0644"
        backup: true

    - name: Start services
      ansible.builtin.command:
        cmd: docker compose up -d
        chdir: "{{ gitea_base_dir }}"
      changed_when: true

    - name: Wait for Caddy to start (port 443)
      ansible.builtin.wait_for:
        port: 443
        host: 127.0.0.1
        delay: 5
        timeout: 60

    - name: Wait for Gitea container to be healthy
      ansible.builtin.command:
        cmd: docker compose ps gitea --format json
        chdir: "{{ gitea_base_dir }}"
      register: gitea_container
      until: "'running' in gitea_container.stdout"
      retries: 12
      delay: 5
      changed_when: false

    # =========================================================================
    # Stage 4: Authentik OAuth Setup
    # =========================================================================
    - name: Install jq for OAuth setup script
      ansible.builtin.apt:
        name: jq
        state: present
        update_cache: true
      when: not authentik_check.failed

    - name: Deploy Gitea OAuth setup script
      ansible.builtin.template:
        src: templates/setup-gitea-oauth.sh.j2
        dest: "{{ gitea_base_dir }}/setup-gitea-oauth.sh"
        mode: "0755"
      when: not authentik_check.failed

    - name: Run Gitea OAuth setup on Authentik
      ansible.builtin.command:
        cmd: "{{ gitea_base_dir }}/setup-gitea-oauth.sh"
      register: oauth_setup
      when: not authentik_check.failed
      changed_when: true

    - name: Display OAuth setup output
      ansible.builtin.debug:
        var: oauth_setup.stdout_lines
      when:
        - not authentik_check.failed
        - oauth_setup is defined

    # =========================================================================
    # Stage 5: Verification
    # =========================================================================
    - name: Wait for Gitea to be healthy on new domain
      ansible.builtin.uri:
        url: "https://{{ gitea_domain }}/api/v1/version"
        method: GET
        status_code: 200
        timeout: 30
        validate_certs: true
      register: gitea_health
      until: gitea_health.status == 200
      retries: 12
      delay: 10
      ignore_errors: true

    - name: Check old domain redirect
      ansible.builtin.uri:
        url: "https://{{ gitea_old_domain }}/"
        method: GET
        follow_redirects: none
        status_code: [301, 302, 308]
        validate_certs: true
      register: redirect_check
      ignore_errors: true

    - name: Display migration status
      ansible.builtin.debug:
        msg: |
          ============================================
          Gitea Migration Complete!
          ============================================

          New URL: https://{{ gitea_domain }}
          Old URL: https://{{ gitea_old_domain }} (redirects)

          Health check: {{ 'PASSED' if gitea_health.status == 200 else 'PENDING - may need DNS propagation' }}
          Redirect check: {{ 'PASSED' if redirect_check.status in [301, 302, 308] else 'PENDING' }}

          Backup: {{ gitea_backup_dir }}/gitea-backup-{{ backup_timestamp | default('N/A') }}.tar.gz

          ============================================
          MANUAL STEPS REQUIRED:
          ============================================

          1. DNS (if not done):
             Add A record: code.stuslab.cc -> 94.130.181.201

          2. OAuth Configuration in Gitea UI:
             - Go to: https://{{ gitea_domain }}/admin/auths/new
             - See credentials: cat /tmp/gitea-oauth-credentials.json

          3. Test git operations:
             ssh -T git@{{ gitea_ssh_domain }} -p {{ gitea_ssh_port }}
             git clone git@{{ gitea_ssh_domain }}:user/repo.git

          ============================================

          View logs:
            ssh root@{{ ansible_host }} "cd {{ gitea_base_dir }} && docker compose logs -f"

          ============================================