#!/usr/bin/env bash
# Disposable, headless smoke check for the incomplete 26.3 runtime Age backend.
set -euo pipefail

repo_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
smoke_dir=$(mktemp -d "${TMPDIR:-/tmp}/rivencraft-263-smoke.XXXXXX")
server_dir="$smoke_dir/server"
server_pid=
input_fd=

cleanup() {
    if [[ -n "$server_pid" ]] && kill -0 "$server_pid" 2>/dev/null; then
        if [[ -n "$input_fd" ]]; then printf 'stop\n' >&"$input_fd" || true; fi
        wait "$server_pid" 2>/dev/null || true
    fi
    if [[ -n "$input_fd" ]]; then exec {input_fd}>&-; fi
    rm -rf -- "$smoke_dir"
}
trap cleanup EXIT

mkdir -p "$server_dir"
printf 'eula=true\n' > "$server_dir/eula.txt"
printf 'server-port=0\nonline-mode=false\nwhite-list=false\n' > "$server_dir/server.properties"

wait_for_log() {
    local log_file=$1 pattern=$2 seconds=$3
    local tries=$((seconds * 4))
    for ((i = 0; i < tries; i++)); do
        if grep -Fq -- "$pattern" "$log_file" 2>/dev/null; then return 0; fi
        if ! kill -0 "$server_pid" 2>/dev/null; then
            printf 'Server exited before: %s\n' "$pattern" >&2
            tail -80 "$log_file" >&2
            return 1
        fi
        sleep 0.25
    done
    printf 'Timed out waiting for: %s\n' "$pattern" >&2
    tail -80 "$log_file" >&2
    return 1
}

start_server() {
    local phase=$1
    log_file="$smoke_dir/$phase.log"
    fifo="$smoke_dir/$phase.stdin"
    mkfifo "$fifo"
    exec {input_fd}<>"$fifo"
    "$repo_dir/gradlew" -p "$repo_dir/ports/mc263" runServer \
        -PserverRunDir="$server_dir" --no-daemon < "$fifo" > "$log_file" 2>&1 &
    server_pid=$!
    wait_for_log "$log_file" 'Done (' 120
}

stop_server() {
    printf 'stop\n' >&"$input_fd"
    wait "$server_pid"
    server_pid=
    exec {input_fd}>&-
    rm -- "$fifo"
}

send_and_wait() {
    local command=$1 result=$2
    printf '%s\n' "$command" >&"$input_fd"
    wait_for_log "$log_file" "$result" 60
}

start_server first
send_and_wait 'rivencraft_port compat' 'Registered biomes by namespace:'
send_and_wait 'rivencraft_port age create smoke_alpha 123456789' 'Created rivencraft:age/smoke_alpha with seed 123456789'
send_and_wait 'rivencraft_port age create smoke_beta 987654321' 'Created rivencraft:age/smoke_beta with seed 987654321'
send_and_wait 'rivencraft_port age create smoke_flat 24680 flat' 'Created rivencraft:age/smoke_flat with seed 24680 terrain=FLAT'
send_and_wait 'rivencraft_port age create smoke_void 13579 void' 'Created rivencraft:age/smoke_void with seed 13579 terrain=VOID'
send_and_wait 'rivencraft_port age create smoke_cave 112233 cave' 'Created rivencraft:age/smoke_cave with seed 112233 terrain=CAVE'
send_and_wait 'rivencraft_port age create_multi smoke_flat_multi 24681 flat' 'Created rivencraft:age/smoke_flat_multi with seed 24681 terrain=FLAT'
send_and_wait 'rivencraft_port age create_multi smoke_void_multi 13580 void' 'Created rivencraft:age/smoke_void_multi with seed 13580 terrain=VOID'
send_and_wait 'rivencraft_port age create_multi smoke_cave_multi 112234 cave' 'Created rivencraft:age/smoke_cave_multi with seed 112234 terrain=CAVE'
# The index must reach disk while the server is still running. A graceful
# shutdown would hide the interrupted-save regression this checks.
index_file="$server_dir/world/dimensions/minecraft/overworld/data/rivencraft/runtime_ages.dat"
[[ -s "$index_file" ]] || {
    printf 'Age index was not persisted before shutdown: %s\n' "$index_file" >&2
    exit 1
}
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_alpha'
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_beta'
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_flat'
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_void'
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_cave'
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_flat_multi'
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_void_multi'
gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_cave_multi'
send_and_wait 'rivencraft_port age sample smoke_alpha' 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_beta' 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_flat' 'rivencraft:age/smoke_flat seed=24680 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_void' 'rivencraft:age/smoke_void seed=13579 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_cave' 'rivencraft:age/smoke_cave seed=112233 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_flat_multi' 'rivencraft:age/smoke_flat_multi seed=24681 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_void_multi' 'rivencraft:age/smoke_void_multi seed=13580 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_cave_multi' 'rivencraft:age/smoke_cave_multi seed=112234 chunkOffset=0 terrain='
send_and_wait 'execute in rivencraft:age/smoke_flat run forceload add 0 0' 'Marked chunk [0, 0] in rivencraft:age/smoke_flat to be force loaded'
send_and_wait 'execute in rivencraft:age/smoke_void run forceload add 0 0' 'Marked chunk [0, 0] in rivencraft:age/smoke_void to be force loaded'
send_and_wait 'execute in rivencraft:age/smoke_flat_multi run forceload add 0 0' 'Marked chunk [0, 0] in rivencraft:age/smoke_flat_multi to be force loaded'
send_and_wait 'execute in rivencraft:age/smoke_void_multi run forceload add 0 0' 'Marked chunk [0, 0] in rivencraft:age/smoke_void_multi to be force loaded'
send_and_wait 'execute in rivencraft:age/smoke_cave run forceload add 0 0' 'Marked chunk [0, 0] in rivencraft:age/smoke_cave to be force loaded'
send_and_wait 'execute in rivencraft:age/smoke_cave_multi run forceload add 0 0' 'Marked chunk [0, 0] in rivencraft:age/smoke_cave_multi to be force loaded'
send_and_wait 'execute in rivencraft:age/smoke_flat if block 0 0 0 minecraft:bedrock run say Flat bedrock starts at Y0' 'Flat bedrock starts at Y0'
send_and_wait 'execute in rivencraft:age/smoke_flat if block 0 3 0 minecraft:grass_block run say Flat surface is Y3' 'Flat surface is Y3'
send_and_wait 'execute in rivencraft:age/smoke_void if block 0 0 0 minecraft:air run say Void remains empty' 'Void remains empty'
send_and_wait 'execute in rivencraft:age/smoke_flat_multi if block 0 0 0 minecraft:bedrock run say Multi Flat bedrock starts at Y0' 'Multi Flat bedrock starts at Y0'
send_and_wait 'execute in rivencraft:age/smoke_void_multi if block 0 0 0 minecraft:air run say Multi Void remains empty' 'Multi Void remains empty'
# Check region interiors after loading the sampled chunks.
send_and_wait 'rivencraft_port age biome smoke_flat_multi 128 128' 'rivencraft:age/smoke_flat_multi biome at 128,128=minecraft:plains'
send_and_wait 'rivencraft_port age biome smoke_flat_multi 384 128' 'rivencraft:age/smoke_flat_multi biome at 384,128=minecraft:forest'
send_and_wait 'rivencraft_port age biome smoke_void_multi 384 128' 'rivencraft:age/smoke_void_multi biome at 384,128=minecraft:forest'
send_and_wait 'rivencraft_port age biome smoke_cave_multi 128 128' 'rivencraft:age/smoke_cave_multi biome at 128,128=minecraft:lush_caves'
send_and_wait 'rivencraft_port age biome smoke_cave_multi 384 128' 'rivencraft:age/smoke_cave_multi biome at 384,128=minecraft:dripstone_caves'
alpha_before=$(grep -F 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
beta_before=$(grep -F 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
flat_before=$(grep -F 'rivencraft:age/smoke_flat seed=24680 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
void_before=$(grep -F 'rivencraft:age/smoke_void seed=13579 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
if [[ "$alpha_before" == "$beta_before" ]]; then
    printf 'Different Age seeds produced the same terrain probe: %s\n' "$alpha_before" >&2
    exit 1
fi
if [[ "$flat_before" == "$void_before" ]]; then
    printf 'Flat and Void Ages produced the same height probe: %s\n' "$flat_before" >&2
    exit 1
fi
stop_server

start_server restart
send_and_wait 'rivencraft_port age list' 'smoke_alpha'
send_and_wait 'rivencraft_port age sample smoke_alpha' 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_beta' 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_flat' 'rivencraft:age/smoke_flat seed=24680 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_void' 'rivencraft:age/smoke_void seed=13579 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_cave' 'rivencraft:age/smoke_cave seed=112233 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_flat_multi' 'rivencraft:age/smoke_flat_multi seed=24681 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_void_multi' 'rivencraft:age/smoke_void_multi seed=13580 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age sample smoke_cave_multi' 'rivencraft:age/smoke_cave_multi seed=112234 chunkOffset=0 terrain='
send_and_wait 'rivencraft_port age biome smoke_flat_multi 384 128' 'rivencraft:age/smoke_flat_multi biome at 384,128=minecraft:forest'
send_and_wait 'rivencraft_port age biome smoke_void_multi 384 128' 'rivencraft:age/smoke_void_multi biome at 384,128=minecraft:forest'
send_and_wait 'rivencraft_port age biome smoke_cave_multi 384 128' 'rivencraft:age/smoke_cave_multi biome at 384,128=minecraft:dripstone_caves'
alpha_after=$(grep -F 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
beta_after=$(grep -F 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
flat_after=$(grep -F 'rivencraft:age/smoke_flat seed=24680 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
void_after=$(grep -F 'rivencraft:age/smoke_void seed=13579 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
[[ "$alpha_before" == "$alpha_after" && "$beta_before" == "$beta_after" ]] || {
    printf 'Age terrain changed across restart: %s/%s -> %s/%s\n' \
        "$alpha_before" "$beta_before" "$alpha_after" "$beta_after" >&2
    exit 1
}
[[ "$flat_before" == "$flat_after" && "$void_before" == "$void_after" ]] || {
    printf 'Flat/Void terrain changed across restart: %s/%s -> %s/%s\n' \
        "$flat_before" "$void_before" "$flat_after" "$void_after" >&2
    exit 1
}
stop_server
printf '26.3 dedicated-server smoke passed: Standard, Flat, Void and Cave Ages persisted across restart.\n'