#!/usr/bin/env bashio
# shellcheck shell=bash
set -euo pipefail

CONFIG_HOME="/config"
PGDATA="${PGDATA:-/config/database}"
export PGDATA
PG_MAJOR_VERSION="${PG_MAJOR:-15}"
RESTART_FLAG_FILE="$CONFIG_HOME/restart_needed"

fix_permissions() {
    mkdir -p "$PGDATA"
    chown -R postgres:postgres "$PGDATA"
    chmod 700 "$PGDATA"
    if [ -d /config/backups ]; then
        chown -R postgres:postgres /config/backups
        chmod 700 /config/backups
    fi
}

chmod -R 755 "$CONFIG_HOME"
RESTART_NEEDED=false
cd /config || true

get_pgdata_version() {
    if [ -f "$PGDATA/PG_VERSION" ]; then
        cat "$PGDATA/PG_VERSION"
    else
        bashio::log.error "FATAL: $PGDATA/PG_VERSION not found; cannot determine cluster version."
        exit 1
    fi
}

extract_so_from_deb() {
    local debfile="$1" targetdir="$2" sofile="$3"
    local tmpdir
    tmpdir=$(mktemp -d)
    dpkg-deb -x "$debfile" "$tmpdir"
    find "$tmpdir" -name "$sofile" -exec cp {} "$targetdir" \;
    rm -rf "$tmpdir"
}

install_vchord_and_vectors_for_old_pg() {
    local old_pgver="$1"
    local vectorchord_tag="${VECTORCHORD_TAG:-0.3.0}"
    local pgvectors_tag="${PGVECTORS_TAG:-0.3.0}"
    case "$(uname -m)" in
        x86_64 | amd64 | AMD64 | x86-64) targetarch=amd64 ;;
        aarch64 | arm64 | ARM64) targetarch=arm64 ;;
        *)
            echo "Unsupported architecture: $(uname -m)"
            exit 1
            ;;
    esac

    local old_pg_lib="/usr/lib/postgresql/$old_pgver/lib"
    mkdir -p "$old_pg_lib"

    # VectorChord
    local vchord_deb="/tmp/vchord-${old_pgver}.deb"
    local vchord_url="https://github.com/tensorchord/VectorChord/releases/download/${vectorchord_tag}/postgresql-${old_pgver}-vchord_${vectorchord_tag}-1_${targetarch}.deb"
    bashio::log.info "Downloading $vchord_url"
    wget -nv -O "$vchord_deb" "$vchord_url"
    extract_so_from_deb "$vchord_deb" "$old_pg_lib" "vchord.so"
    rm -f "$vchord_deb"

    # pgvecto.rs
    local vectors_deb="/tmp/pgvectors-${old_pgver}.deb"
    local vectors_url="https://github.com/tensorchord/pgvecto.rs/releases/download/v${pgvectors_tag}/vectors-pg${old_pgver}_${pgvectors_tag}_${targetarch}.deb"
    bashio::log.info "Downloading $vectors_url"
    wget -nv -O "$vectors_deb" "$vectors_url"
    extract_so_from_deb "$vectors_deb" "$old_pg_lib" "vectors.so"
    rm -f "$vectors_deb"
}

drop_vectors_everywhere() {
    local old_pgver="$1"
    fix_permissions

    su - postgres -c "$BINARIES_DIR/$old_pgver/bin/pg_ctl -w -D '$PGDATA' \
		-o \"-c config_file=/etc/postgresql/postgresql.conf \
		    -c listen_addresses='' -c port=65432\" start"

    for db in $(su - postgres -c \
        "$BINARIES_DIR/$old_pgver/bin/psql -U \"$DB_USERNAME\" -Atc \
		    \"SELECT datname FROM pg_database WHERE datistemplate = false AND datallowconn\""); do
        if su - postgres -c \
            "$BINARIES_DIR/$old_pgver/bin/psql -U \"$DB_USERNAME\" -d $db -Atc \
			    \"SELECT 1 FROM pg_extension WHERE extname='vectors'\"" | grep -q 1; then
            bashio::log.warning "Dropping extension vectors from DB $db"
            su - postgres -c \
                "$BINARIES_DIR/$old_pgver/bin/psql -U \"$DB_USERNAME\" -d $db -c \
				    'DROP EXTENSION vectors CASCADE;'"
        fi
    done

    su - postgres -c "$BINARIES_DIR/$old_pgver/bin/pg_ctl -w -D '$PGDATA' stop"
}

start_postgres() {
    bashio::log.info "Starting PostgreSQL..."
    if [ "$(bashio::info.arch)" = "armv7" ]; then
        bashio::log.warning "ARMv7 detected: Starting without vectors.so"
        /usr/local/bin/immich-docker-entrypoint.sh postgres &
    else
        /usr/local/bin/immich-docker-entrypoint.sh postgres -c config_file=/etc/postgresql/postgresql.conf &
    fi
    true
}

wait_for_postgres() {
    local tries=0
    while ! pg_isready -h "$DB_HOSTNAME" -p "$DB_PORT" -U "$DB_USERNAME" > /dev/null 2>&1; do
        tries=$((tries + 1))
        [ "$tries" -ge 60 ] && {
            bashio::log.error "Postgres did not start after 2 minutes, aborting."
            exit 1
        }
        echo "PostgreSQL is starting up... ($tries/60)"
        sleep 2
    done
}

restart_immich_addons_if_flagged() {
    [ ! -f "$RESTART_FLAG_FILE" ] && return 0
    bashio::log.warning "Detected pending Immich add‑on restart flag. Restarting all running Immich add‑ons…"

    local addons_json found=0
    addons_json=$(curl -fsSL -H "Authorization: Bearer $SUPERVISOR_TOKEN" http://supervisor/addons) || {
        bashio::log.error "Supervisor API call failed or unauthorized: $addons_json"
        rm -f "$RESTART_FLAG_FILE"
        return 1
    }

    if command -v jq > /dev/null; then
        for slug in $(echo "$addons_json" | jq -r '.addons[] | select(.state=="started") | .slug'); do
            if [[ "$slug" == *immich* ]]; then
                bashio::log.info "Restarting addon $slug"
                curl -fsSL -X POST -H "Authorization: Bearer $SUPERVISOR_TOKEN" "http://supervisor/addons/$slug/restart"
                found=1
            fi
        done
    else
        for slug in $(echo "$addons_json" | grep -o '"slug":"[^"]*"' | cut -d: -f2 | tr -d '"'); do
            if [[ "$slug" == *immich* ]]; then
                bashio::log.info "Restarting addon $slug"
                curl -fsSL -X POST -H "Authorization: Bearer $SUPERVISOR_TOKEN" "http://supervisor/addons/$slug/restart"
                found=1
            fi
        done
    fi

    [ "$found" -eq 0 ] && bashio::log.info "No Immich-related addon found running."
    rm -f "$RESTART_FLAG_FILE"
}

# ---------------------------  DB connection setup  ---------------------------
DB_PORT=5432
DB_HOSTNAME=localhost
DB_PASSWORD="$(bashio::config 'POSTGRES_PASSWORD')"
DB_PASSWORD="$(jq -rn --arg x "$DB_PASSWORD" '$x|@uri')"

if bashio::config.has_value "POSTGRES_USER"; then
    DB_USERNAME="$(bashio::config 'POSTGRES_USER')"
else
    DB_USERNAME="postgres"
fi
export DB_PORT DB_HOSTNAME DB_USERNAME DB_PASSWORD
# -----------------------------------------------------------------------------

get_available_extension_version() {
    local extname="$1"
    psql "postgres://$DB_USERNAME:$DB_PASSWORD@$DB_HOSTNAME:$DB_PORT/postgres" -v ON_ERROR_STOP=1 -tAc \
        "SELECT default_version FROM pg_available_extensions WHERE name = '$extname';" 2> /dev/null | xargs
}

is_extension_available() {
    local extname="$1"
    local result
    result=$(psql "postgres://$DB_USERNAME:$DB_PASSWORD@$DB_HOSTNAME:$DB_PORT/postgres" -v ON_ERROR_STOP=1 -tAc \
        "SELECT 1 FROM pg_available_extensions WHERE name = '$extname';" 2> /dev/null | xargs)
    [[ "$result" == "1" ]]
}

get_user_databases() {
    psql "postgres://$DB_USERNAME:$DB_PASSWORD@$DB_HOSTNAME:$DB_PORT/postgres" -v ON_ERROR_STOP=1 -tAc \
        "SELECT datname FROM pg_database WHERE datistemplate = false AND datallowconn = true;"
}

get_installed_extension_version() {
    local extname="$1" dbname="$2"
    psql "postgres://$DB_USERNAME:$DB_PASSWORD@$DB_HOSTNAME:$DB_PORT/$dbname" -v ON_ERROR_STOP=1 -tAc \
        "SELECT extversion FROM pg_extension WHERE extname = '$extname';" 2> /dev/null | xargs
}

compare_versions() {
    local v1="$1" v2="$2"
    [ "$v1" = "$v2" ] && return 1
    [ "$(printf '%s\n' "$v1" "$v2" | sort -V | head -n1)" = "$v1" ]
}

show_db_extensions() {
    bashio::log.info "==== PostgreSQL databases and enabled extensions ===="
    for db in $(get_user_databases); do
        bashio::log.info "Database: $db"
        exts=$(psql "postgres://$DB_USERNAME:$DB_PASSWORD@$DB_HOSTNAME:$DB_PORT/$db" -tAc \
            "SELECT extname || ' (v' || extversion || ')' FROM pg_extension ORDER BY extname;")
        if [ -n "$exts" ]; then
            while read -r ext; do
                [ -n "$ext" ] && bashio::log.info "    - $ext"
            done <<< "$exts"
        else
            bashio::log.info "    (no extensions enabled)"
        fi
    done
    bashio::log.info "=============================================="
}

upgrade_extension_if_needed() {
    local extname="$1"
    is_extension_available "$extname" || {
        bashio::log.info "$extname extension not available."
        return
    }

    local available_version
    available_version=$(get_available_extension_version "$extname")
    [ -z "$available_version" ] && {
        bashio::log.info "Could not determine available version for $extname."
        return
    }

    for db in $(get_user_databases); do
        local installed_version
        installed_version=$(get_installed_extension_version "$extname" "$db")
        [ -z "$installed_version" ] && continue

        if compare_versions "$installed_version" "$available_version"; then
            bashio::log.info "Upgrading $extname in $db from $installed_version to $available_version"
            if psql -h "$DB_HOSTNAME" -p "$DB_PORT" -U "$DB_USERNAME" -d "$db" -v ON_ERROR_STOP=1 -c "ALTER EXTENSION $extname UPDATE;"; then
                bashio::log.info "Reindexing database $db"
                psql -h "$DB_HOSTNAME" -p "$DB_PORT" -U "$DB_USERNAME" -d "$db" -v ON_ERROR_STOP=1 -c "REINDEX DATABASE $db;"
                RESTART_NEEDED=true
            else
                bashio::log.error "Failed to upgrade $extname in $db. Aborting startup."
                exit 1
            fi
        else
            bashio::log.info "$extname in $db already at latest version ($installed_version)"
        fi
    done
}

upgrade_postgres_if_needed() {
    CLUSTER_VERSION=$(get_pgdata_version)
    IMAGE_VERSION="$PG_MAJOR_VERSION"
    [ "$CLUSTER_VERSION" = "$IMAGE_VERSION" ] && {
        bashio::log.info "PostgreSQL data directory version ($CLUSTER_VERSION) matches image version ($IMAGE_VERSION)."
        return
    }

    bashio::log.warning "Postgres data directory version is $CLUSTER_VERSION but image wants $IMAGE_VERSION. Running upgrade..."
    export DATA_DIR="$PGDATA" BINARIES_DIR="/usr/lib/postgresql" BACKUP_DIR="/config/backups"
    export PSQL_VERSION="$IMAGE_VERSION" SUPPORTED_POSTGRES_VERSIONS="$CLUSTER_VERSION $IMAGE_VERSION"

    apt-get update &> /dev/null
    apt-get install -y procps rsync "postgresql-$IMAGE_VERSION" "postgresql-$CLUSTER_VERSION"

    [ -d "$BINARIES_DIR/$CLUSTER_VERSION/bin" ] || {
        bashio::log.error "Old postgres binaries missing."
        exit 1
    }
    [ -d "$BINARIES_DIR/$IMAGE_VERSION/bin" ] || {
        bashio::log.error "New postgres binaries missing."
        exit 1
    }

    install_vchord_and_vectors_for_old_pg "$CLUSTER_VERSION"

    mkdir -p "$BACKUP_DIR"
    local backup_target="$BACKUP_DIR/postgresql-$CLUSTER_VERSION"
    bashio::log.info "Backing up data directory to $backup_target..."
    rsync -a --delete "$PGDATA/" "$backup_target/" || {
        bashio::log.error "Backup with rsync failed!"
        exit 1
    }

    cp -n --preserve=mode "/var/postgresql-conf-tpl/postgresql.hdd.conf" /etc/postgresql/postgresql.conf
    sed -i "s@##PGDATA@$PGDATA@" /etc/postgresql/postgresql.conf

    drop_vectors_everywhere "$CLUSTER_VERSION"
    fix_permissions

    bashio::log.info "Starting old Postgres ($CLUSTER_VERSION) to capture encoding/locale settings"
    su - postgres -c "$BINARIES_DIR/$CLUSTER_VERSION/bin/pg_ctl -w -D '$PGDATA' -o \"-c config_file=/etc/postgresql/postgresql.conf\" start"

    LC_COLLATE=$(su - postgres -c "$BINARIES_DIR/$CLUSTER_VERSION/bin/psql -U \"$DB_USERNAME\" -d postgres -Atc 'SHOW LC_COLLATE;'")
    LC_CTYPE=$(su - postgres -c "$BINARIES_DIR/$CLUSTER_VERSION/bin/psql -U \"$DB_USERNAME\" -d postgres -Atc 'SHOW LC_CTYPE;'")
    ENCODING=$(su - postgres -c "$BINARIES_DIR/$CLUSTER_VERSION/bin/psql -U \"$DB_USERNAME\" -d postgres -Atc 'SHOW server_encoding;'")
    bashio::log.info "Detected cluster: LC_COLLATE=$LC_COLLATE, LC_CTYPE=$LC_CTYPE, ENCODING=$ENCODING"

    bashio::log.info "Stopping old Postgres ($CLUSTER_VERSION)"
    su - postgres -c "$BINARIES_DIR/$CLUSTER_VERSION/bin/pg_ctl -w -D '$PGDATA' -o \"-c config_file=/etc/postgresql/postgresql.conf\" stop"

    rm -rf "$PGDATA"
    fix_permissions

    bashio::log.info "Initializing new data cluster for $IMAGE_VERSION"
    su - postgres -c "$BINARIES_DIR/$IMAGE_VERSION/bin/initdb --encoding=$ENCODING --lc-collate=$LC_COLLATE --lc-ctype=$LC_CTYPE -D '$PGDATA'"
    fix_permissions

    bashio::log.info "Running pg_upgrade from $CLUSTER_VERSION → $IMAGE_VERSION"
    chmod 700 "$PGDATA" "$backup_target"
    su - postgres -c "$BINARIES_DIR/$IMAGE_VERSION/bin/pg_upgrade \
		-b '$BINARIES_DIR/$CLUSTER_VERSION/bin' -B '$BINARIES_DIR/$IMAGE_VERSION/bin' \
		-d '$backup_target' -D '$PGDATA' \
		-o \"-c config_file=/etc/postgresql/postgresql.conf\" \
		-O \"-c config_file=/etc/postgresql/postgresql.conf\""

    [ -f "$backup_target/postgresql.conf" ] && cp "$backup_target/postgresql.conf" "$PGDATA"
    [ -f "$backup_target/pg_hba.conf" ] && cp -f "$backup_target/pg_hba.conf" "$PGDATA"

    bashio::log.info "Upgrade completed successfully."
    RESTART_NEEDED=true
}

check_for_reindex() {
    local log_tail
    log_tail=$(timeout 15 cat /proc/1/fd/1 | tail -n 5)
    echo "$log_tail" | grep -q "please use REINDEX to rebuild the index" || return 0

    bashio::log.warning "REINDEX needed, starting now"
    for db in $(get_user_databases); do
        psql -h "$DB_HOSTNAME" -p "$DB_PORT" -U "$DB_USERNAME" -d "$db" -v ON_ERROR_STOP=1 -c "REINDEX DATABASE $db;"
    done
}

main() {
    bashio::log.info "Checking for required PostgreSQL cluster upgrade before server start…"
    [ -f /config/database/PG_VERSION ] && upgrade_postgres_if_needed

    start_postgres
    bashio::log.info "Waiting for PostgreSQL to start…"
    wait_for_postgres
    restart_immich_addons_if_flagged

    # Drop legacy vectors extension (connect as $DB_USERNAME)
    su - postgres -c "psql -U \"$DB_USERNAME\" -d postgres -c 'DROP EXTENSION IF EXISTS vectors CASCADE;'"

    upgrade_extension_if_needed "vectors"
    upgrade_extension_if_needed "vchord"
    show_db_extensions

    if [ "$RESTART_NEEDED" = true ]; then
        bashio::log.warning "A critical update occurred. Restarting Immich add‑on(s) after DB restart."
        touch "$RESTART_FLAG_FILE"
        bashio::addon.restart
        exit 0
    fi

    if [ -d /config/backups ]; then
        echo "Cleaning /config/backups now that upgrade is done"
        rm -r /config/backups
    fi

    check_for_reindex &
    bashio::log.info "All initialization / version‑check steps completed successfully!"
}

main