{ config, lib, pkgs, homeyConfig, ... }:

# Gitea — self-hosted Git service.
#
# Auth model: LDAP authentication is configured through Gitea's admin UI
# (or CLI) after first start. Reverse proxy auth headers from Caddy/Authelia
# handle transparent login.
#
# Volume layout:
#   <dataDir>/gitea/data/  → /data  (repos, sqlite db, avatars, lfs, etc.)
#
# Configuration strategy: all settings are passed as GITEA__<SECTION>__<KEY>
# environment variables. Gitea writes its own app.ini into /data/gitea/conf/
# on first start; the env vars override every key at runtime without touching
# that file. This avoids the bind-mount / read-only-fs problem where Gitea
# needs to rewrite its own config file on startup.
#
# Non-secret settings go in the `environment` block (they are fine in the
# Nix store). Secret settings go into /run/gitea-secrets.env via ExecStartPre
# (never in the store).
#
# Secrets consumed from sops:
#   gitea/admin_password
#   gitea/lfs_jwt_secret
#   gitea/oauth2_jwt_secret
#   gitea/internal_token

let
  cfg     = config.homey.gitea;
  dataDir = config.homey.storage.mountPoint;
  domain  = homeyConfig.domain;
in
{
  options.homey.gitea = {
    enable = lib.mkEnableOption "Gitea Git server";

    image = lib.mkOption {
      type    = lib.types.str;
      default = "docker.io/gitea/gitea:latest";
    };

    port = lib.mkOption {
      type    = lib.types.port;
      default = 3000;
      description = "Host port Gitea listens on (bound to 127.0.0.1).";
    };
  };

  config = lib.mkIf cfg.enable {
    # -----------------------------------------------------------------------
    # Secrets
    # -----------------------------------------------------------------------
    sops.secrets."gitea/admin_password"    = { owner = "root"; };
    sops.secrets."gitea/lfs_jwt_secret"    = { owner = "root"; };
    sops.secrets."gitea/oauth2_jwt_secret" = { owner = "root"; };
    sops.secrets."gitea/internal_token"    = { owner = "root"; };

    # -----------------------------------------------------------------------
    # Container
    # -----------------------------------------------------------------------
    virtualisation.oci-containers.containers.gitea = {
      image = cfg.image;
      ports = [ "127.0.0.1:${toString cfg.port}:3000" ];

      # All non-secret settings via GITEA__<SECTION>__<KEY> env vars.
      # These are safe to store in the Nix store.
      environment = {
        USER_UID     = "1000";
        USER_GID     = "1000";
        GITEA_CUSTOM = "/data/gitea";

        # [DEFAULT]
        GITEA____APP_NAME = homeyConfig.organization;
        GITEA____RUN_MODE = "prod";

        # [repository]
        GITEA__repository__ROOT = "/data/git/repositories";

        # [server]
        GITEA__server__APP_DATA_PATH    = "/data/gitea";
        GITEA__server__DOMAIN           = "git.${domain}";
        GITEA__server__HTTP_PORT        = toString cfg.port;
        GITEA__server__ROOT_URL         = "https://git.${domain}/";
        GITEA__server__DISABLE_SSH       = "true";
        GITEA__server__START_SSH_SERVER  = "false";
        GITEA__server__SSH_PORT          = "2222";
        GITEA__server__SSH_LISTEN_PORT   = "2222";
        GITEA__server__LFS_START_SERVER  = "true";
        GITEA__server__OFFLINE_MODE     = "false";

        # [lfs]
        GITEA__lfs__PATH = "/data/git/lfs";

        # [database]
        GITEA__database__DB_TYPE = "sqlite3";
        GITEA__database__PATH    = "/data/gitea/gitea.db";
        GITEA__database__LOG_SQL = "false";

        # [indexer]
        GITEA__indexer__ISSUE_INDEXER_PATH = "/data/gitea/indexers/issues.bleve";

        # [session]
        GITEA__session__PROVIDER        = "file";
        GITEA__session__PROVIDER_CONFIG = "/data/gitea/sessions";

        # [picture]
        GITEA__picture__AVATAR_UPLOAD_PATH            = "/data/gitea/avatars";
        GITEA__picture__REPOSITORY_AVATAR_UPLOAD_PATH = "/data/gitea/repo-avatars";
        GITEA__picture__DISABLE_GRAVATAR              = "false";

        # [attachment]
        GITEA__attachment__PATH = "/data/gitea/attachments";

        # [log]
        GITEA__log__MODE      = "console";
        GITEA__log__LEVEL     = "info";
        GITEA__log__ROOT_PATH = "/data/gitea/log";

        # [security]
        GITEA__security__INSTALL_LOCK                  = "true";
        GITEA__security__REVERSE_PROXY_LIMIT           = "1";
        GITEA__security__REVERSE_PROXY_TRUSTED_PROXIES = "*";

        # [service]
        GITEA__service__DISABLE_REGISTRATION              = "true";
        GITEA__service__REQUIRE_SIGNIN_VIEW               = "false";
        GITEA__service__REGISTER_EMAIL_CONFIRM            = "false";
        GITEA__service__ENABLE_NOTIFY_MAIL                = "false";
        GITEA__service__ALLOW_ONLY_EXTERNAL_REGISTRATION  = "true";
        GITEA__service__ENABLE_CAPTCHA                    = "false";
        GITEA__service__DEFAULT_ALLOW_CREATE_ORGANIZATION = "true";
        GITEA__service__DEFAULT_ENABLE_TIMETRACKING       = "true";
        GITEA__service__NO_REPLY_ADDRESS                  = "noreply.localhost";
        GITEA__service__ENABLE_REVERSE_PROXY_AUTHENTICATION    = "true";
        GITEA__service__ENABLE_REVERSE_PROXY_AUTO_REGISTRATION = "true";

        # [mailer]
        GITEA__mailer__ENABLED = "false";

        # [openid]
        GITEA__openid__ENABLE_OPENID_SIGNIN = "false";
        GITEA__openid__ENABLE_OPENID_SIGNUP = "false";

        # [oauth2]
        GITEA__oauth2__ENABLED = "false";
      };

      # Secret env vars written at runtime by ExecStartPre — never in store.
      environmentFiles = [ "/run/gitea-secrets.env" ];

      volumes = [
        "${dataDir}/gitea/data:/data"
      ];

      extraOptions = [ "--network=homey" ];
    };

    # -----------------------------------------------------------------------
    # ExecStartPre: write ephemeral secrets env file
    # ExecStopPost: clean it up
    # -----------------------------------------------------------------------
    systemd.services."podman-gitea" = {
      serviceConfig = {
        ExecStartPre = [
          (pkgs.writeShellScript "gitea-write-secrets" ''
            set -euo pipefail
            LFS=$(cat ${config.sops.secrets."gitea/lfs_jwt_secret".path})
            OAUTH=$(cat ${config.sops.secrets."gitea/oauth2_jwt_secret".path})
            TOKEN=$(cat ${config.sops.secrets."gitea/internal_token".path})
            printf '%s\n' \
              "GITEA__server__LFS_JWT_SECRET=$LFS" \
              "GITEA__security__INTERNAL_TOKEN=$TOKEN" \
              "GITEA__oauth2__JWT_SECRET=$OAUTH" \
              > /run/gitea-secrets.env
            chmod 600 /run/gitea-secrets.env
          '')
        ];
        ExecStopPost = [
          (pkgs.writeShellScript "gitea-cleanup-secrets" ''
            rm -f /run/gitea-secrets.env
          '')
        ];
      };
      after    = lib.mkAfter [ "mnt-data.mount" "podman-openldap.service" "podman-homey-network.service" ];
      requires = lib.mkAfter [ "mnt-data.mount" "podman-homey-network.service" ];
    };

    # -----------------------------------------------------------------------
    # Ensure the Gitea admin user exists with the correct password after start.
    # Runs as a oneshot after podman-gitea; idempotent (create or update).
    # -----------------------------------------------------------------------
    systemd.services."gitea-admin-setup" = {
      description = "Ensure Gitea admin user exists with correct password";
      wantedBy    = [ "multi-user.target" ];
      after       = [ "podman-gitea.service" ];
      requires    = [ "podman-gitea.service" ];

      serviceConfig = {
        Type            = "oneshot";
        RemainAfterExit = true;
      };

      script = ''
        set -euo pipefail
        PASS=$(cat ${config.sops.secrets."gitea/admin_password".path})

        # Wait until Gitea's HTTP endpoint is up (max 60 s)
        for i in $(seq 1 60); do
          if ${pkgs.curl}/bin/curl -sf http://127.0.0.1:${toString cfg.port}/ -o /dev/null; then
            break
          fi
          sleep 1
        done

        # Sync password if admin exists; create if not.
        if ! ${pkgs.podman}/bin/podman exec -u 1000 gitea \
            gitea admin user change-password --username admin --password "$PASS" 2>/dev/null; then
          ${pkgs.podman}/bin/podman exec -u 1000 gitea \
            gitea admin user create \
              --username admin \
              --password "$PASS" \
              --email "admin@${domain}" \
              --admin
        fi
      '';
    };
  };
}