#!/bin/bash
set -eo pipefail

LOG_FILE="build_win.log"
> "$LOG_FILE"

log() { echo "$1"; echo "$1" >> "$LOG_FILE"; }

log "================================"
log "ChatGUI Build Script (MSYS2 UCRT64)"
log "================================"
log ""

SRC_DIR="$(cd "$(dirname "$0")" && pwd)"
BUILD_DIR="$SRC_DIR/build"

log "Source:  $SRC_DIR"
log "Build:   $BUILD_DIR"
log ""

if [ -f "$BUILD_DIR/CMakeCache.txt" ]; then
    OLD_GEN=$(grep 'CMAKE_GENERATOR:' "$BUILD_DIR/CMakeCache.txt" 2>/dev/null | cut -d= -f2)
    if [ "$OLD_GEN" != "Ninja" ]; then
        log "Generator changed ($OLD_GEN -> Ninja), cleaning build dir..."
        rm -rf "$BUILD_DIR"
    fi
fi

log "[1/4] Configuring CMake (generator: Ninja)..."
cmake -S "$SRC_DIR" -B "$BUILD_DIR" -G Ninja 2>&1 | tee -a "$LOG_FILE"
test ${PIPESTATUS[0]} -eq 0 || { log "CMake configure FAILED"; exit 1; }

log ""
JOBS=$(nproc 2>/dev/null || echo 4)
log "[2/4] Building (parallel: $JOBS jobs)..."
cmake --build "$BUILD_DIR" -j"$JOBS" 2>&1 | tee -a "$LOG_FILE"
test ${PIPESTATUS[0]} -eq 0 || { log "Build FAILED"; exit 1; }

log ""
log "[3/4] Deploying runtime DLLs..."
WINDEPLOYQT="/ucrt64/bin/windeployqt"
if [ -x "$WINDEPLOYQT" ]; then
    log "  Running $WINDEPLOYQT..."
    "$WINDEPLOYQT" --no-translations --no-compiler-runtime "$BUILD_DIR/vibechat.exe" 2>&1 | tee -a "$LOG_FILE"
    RC=${PIPESTATUS[0]}
    if [ $RC -eq 0 ]; then
        log "  OK: windeployqt completed"
    else
        log "  WARN: windeployqt failed (exit $RC)"
    fi
else
    log "  WARN: $WINDEPLOYQT not found (install: pacman -S mingw-w64-ucrt-x86_64-qt5-tools)"
    log "  Resolving dependencies recursively..."
    todo="$BUILD_DIR/vibechat.exe"
    while [ -n "$todo" ]; do
        next_todo=""
        for src in $todo; do
            for dep in $(objdump -p "$src" 2>/dev/null | grep "DLL Name:" | awk '{print $3}'); do
                case "$dep" in
                    KERNEL32.dll|msvcrt.dll|USER32.dll|GDI32.dll|SHELL32.dll|ADVAPI32.dll|\
                    WS2_32.dll|ole32.dll|OLEAUT32.dll|IPHLPAPI.DLL|BCRYPT.dll|dbghelp.dll|\
                    api-ms-win-*)
                        continue ;;
                esac
                [ -f "$BUILD_DIR/$dep" ] && continue
                if cp "/ucrt64/bin/$dep" "$BUILD_DIR/" 2>/dev/null; then
                    log "  OK: $dep"; next_todo="$next_todo $BUILD_DIR/$dep"
                elif cp "/mingw64/bin/$dep" "$BUILD_DIR/" 2>/dev/null; then
                    log "  OK: $dep (mingw64)"; next_todo="$next_todo $BUILD_DIR/$dep"
                fi
            done
        done
        todo="$next_todo"
    done
fi
# Qt platform plugin (loaded dynamically, not in import table)
mkdir -p "$BUILD_DIR/platforms"
for d in /ucrt64/share/qt5/plugins /ucrt64/lib/qt5/plugins; do
    cp "$d/platforms/qwindows.dll" "$BUILD_DIR/platforms/" 2>/dev/null && break
done
cp "$SRC_DIR/rlottie_build/librlottie.dll" "$BUILD_DIR/" 2>/dev/null && log "  OK: librlottie.dll" || log "  WARN: librlottie.dll not found"
cp "$SRC_DIR/setup_firewall.bat" "$BUILD_DIR/" 2>/dev/null && log "  OK: setup_firewall.bat" || log "  WARN: setup_firewall.bat not found"

log ""
log "[4/4] Verifying..."
EXE="$BUILD_DIR/vibechat.exe"
if [ -f "$EXE" ]; then
    SIZE=$(du -h "$EXE" | cut -f1)
    log "  OK: vibechat.exe ($SIZE)"
    log ""
    log "================================"
    log "Build SUCCESS"
    log "================================"
    log "Executable: $EXE"
else
    log "  FAIL: vibechat.exe not found"
    exit 1
fi