name: 'Kernel Fixes'
description: 'Applies compatibility fixes based on android/kernel/sublevel'
inputs:
  android_version:
    required: true
    type: string
  kernel_version:
    required: true
    type: string
  sublevel:
    required: true
    type: string
  os_patch_level:
    required: true
    type: string

runs:
  using: composite
  steps:
    - name: 'Apply Makefile and parse-options.c fixes for GLIBC >= 2.38'
      working-directory: ${{ github.workspace }}/kernel/common
      shell: bash
      run: |
        set -euo pipefail
        GLIBC_VERSION="$(ldd --version 2>/dev/null | head -n 1 | awk '{print $NF}')"
        echo "[INFO] Detected GLIBC version: $GLIBC_VERSION"
        if [ "$(printf '%s\n' "2.38" "$GLIBC_VERSION" | sort -V | head -n 1)" = "2.38" ]; then
          echo "[INFO] GLIBC >= 2.38, attempting Makefile fix."
          # Check if the pattern that needs fixing actually exists
          if grep -q '\$(Q)\$(MAKE) -C \$(SUBCMD_SRC) OUTPUT=\$(abspath \$(dir \$@))\/ \$(abspath \$@)' tools/bpf/resolve_btfids/Makefile; then
            echo "[INFO] Found pattern to fix, applying sed."
            sed -i '/\$(Q)\$(MAKE) -C \$(SUBCMD_SRC) OUTPUT=\$(abspath \$(dir \$@))\/ \$(abspath \$@)/s//$(Q)$(MAKE) -C $(SUBCMD_SRC) EXTRA_CFLAGS="$(CFLAGS)" OUTPUT=$(abspath $(dir $@))\/ $(abspath $@)/' tools/bpf/resolve_btfids/Makefile
            MAKEFILE_FIXED="true"
          elif grep -q 'EXTRA_CFLAGS' tools/bpf/resolve_btfids/Makefile; then
            echo "[INFO] EXTRA_CFLAGS already present, no fix needed."
            MAKEFILE_FIXED="already_fixed"
          else
            echo "[WARN] Neither pattern found in Makefile."
            MAKEFILE_FIXED="false"
          fi
          echo "MAKEFILE_FIXED=$MAKEFILE_FIXED" >> $GITHUB_ENV
          if [[ "${{ inputs.android_version }}" == "android13" && "${{ inputs.kernel_version }}" == "5.10" && "${{ inputs.sublevel }}" -le 186 ]] || \
             [[ "${{ inputs.android_version }}" == "android13" && "${{ inputs.kernel_version }}" == "5.15" && "${{ inputs.sublevel }}" -le 119 ]] || \
             [[ "${{ inputs.android_version }}" == "android14" && "${{ inputs.kernel_version }}" == "5.15" && "${{ inputs.sublevel }}" -le 110 ]]; then
            echo "[INFO] Applying parse-options.c fixes."
            sed -i '/char \*buf = NULL;/a int i;' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            sed -i 's/for (int i = 0; subcommands\[i\]; i++) {/for (i = 0; subcommands[i]; i++) {/' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            sed -i '/if (subcommands) {/a int i;' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            sed -i 's/for (int i = 0; subcommands\[i\]; i++)/for (i = 0; subcommands[i]; i++)/' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            echo "PARSE_OPTIONS_FIXED=true" >> $GITHUB_ENV
          else
            echo "PARSE_OPTIONS_FIXED=false" >> $GITHUB_ENV
          fi
        else
          echo "[SKIP] GLIBC version < 2.38, skipping Makefile fix."
        fi

    - name: 'Create GitHub Summary for Makefile changes'
      shell: bash
      working-directory: ${{ github.workspace }}/kernel/common
      run: |
        echo "## Makefile and parse-options.c Fixes Applied" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        echo "### GLIBC Check" >> $GITHUB_STEP_SUMMARY
        GLIBC_VERSION="$(ldd --version 2>/dev/null | head -n 1 | awk '{print $NF}')"
        echo "- Detected GLIBC Version: **$GLIBC_VERSION**" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        
        if [ "$(printf '%s\n' "2.38" "$GLIBC_VERSION" | sort -V | head -n 1)" = "2.38" ]; then
          echo "### Makefile Changes" >> $GITHUB_STEP_SUMMARY
          if [ "$MAKEFILE_FIXED" = "true" ]; then
            echo "✅ **Makefile Fixed**: Found and replaced pattern with EXTRA_CFLAGS" >> $GITHUB_STEP_SUMMARY
          elif [ "$MAKEFILE_FIXED" = "already_fixed" ]; then
            echo "ℹ️ **Makefile Already Fixed**: EXTRA_CFLAGS already present" >> $GITHUB_STEP_SUMMARY
          else
            echo "❌ **Makefile Not Fixed**: Pattern not found (may not need fixing)" >> $GITHUB_STEP_SUMMARY
          fi
          echo "" >> $GITHUB_STEP_SUMMARY
          
          # Check parse-options.c changes - only report if version conditions match
          if [[ "${{ inputs.android_version }}" == "android13" && "${{ inputs.kernel_version }}" == "5.10" && "${{ inputs.sublevel }}" -le 186 ]] || \
             [[ "${{ inputs.android_version }}" == "android13" && "${{ inputs.kernel_version }}" == "5.15" && "${{ inputs.sublevel }}" -le 119 ]] || \
             [[ "${{ inputs.android_version }}" == "android14" && "${{ inputs.kernel_version }}" == "5.15" && "${{ inputs.sublevel }}" -le 110 ]]; then
            echo "### parse-options.c Changes" >> $GITHUB_STEP_SUMMARY
            echo "✅ Version ${{ inputs.android_version }} + kernel ${{ inputs.kernel_version }} (sublevel ${{ inputs.sublevel }}) matched conditions" >> $GITHUB_STEP_SUMMARY
            echo "- Applied variable declarations and loop syntax fixes to parse-options.c" >> $GITHUB_STEP_SUMMARY
          else
            echo "### parse-options.c Changes" >> $GITHUB_STEP_SUMMARY
            echo "❌ Version ${{ inputs.android_version }} + kernel ${{ inputs.kernel_version }} (sublevel ${{ inputs.sublevel }}) did not match fix conditions" >> $GITHUB_STEP_SUMMARY
          fi
        else
          echo "### No Changes Applied" >> $GITHUB_STEP_SUMMARY
          echo "- GLIBC < 2.38 detected, skipping all fixes" >> $GITHUB_STEP_SUMMARY
        fi

    - name: 'Final Kernel Fixes Summary'
      shell: bash
      run: |
        echo "## Final Kernel Fixes Summary" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        echo "**Kernel Version:** ${{ inputs.android_version }} + ${{ inputs.kernel_version }} (sublevel ${{ inputs.sublevel }})" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        
        echo "### ✅ Fixes Applied/Matched" >> $GITHUB_STEP_SUMMARY
        MATCHED_COUNT=0
        if [ "$MAKEFILE_FIXED" = "true" ] || [ "$MAKEFILE_FIXED" = "already_fixed" ]; then
          echo "- Makefile EXTRA_CFLAGS fix" >> $GITHUB_STEP_SUMMARY
          MATCHED_COUNT=$((MATCHED_COUNT + 1))
        fi
        if [ "$PARSE_OPTIONS_FIXED" = "true" ]; then
          echo "- parse-options.c variable declaration fixes" >> $GITHUB_STEP_SUMMARY
          MATCHED_COUNT=$((MATCHED_COUNT + 1))
        fi
        if [ $MATCHED_COUNT -eq 0 ]; then
          echo "- *None*" >> $GITHUB_STEP_SUMMARY
        fi
        echo "" >> $GITHUB_STEP_SUMMARY
        
        echo "### ❌ Fixes Not Applicable" >> $GITHUB_STEP_SUMMARY
        NOT_MATCHED_COUNT=0
        if [ "$MAKEFILE_FIXED" = "false" ]; then
          echo "- Makefile EXTRA_CFLAGS fix (pattern not found)" >> $GITHUB_STEP_SUMMARY
          NOT_MATCHED_COUNT=$((NOT_MATCHED_COUNT + 1))
        fi
        if [ "$PARSE_OPTIONS_FIXED" = "false" ]; then
          echo "- parse-options.c fixes (version doesn't match conditions)" >> $GITHUB_STEP_SUMMARY
          NOT_MATCHED_COUNT=$((NOT_MATCHED_COUNT + 1))
        fi
        if [ $NOT_MATCHED_COUNT -eq 0 ]; then
          echo "- *None*" >> $GITHUB_STEP_SUMMARY
        fi
        
    - name: 'Apply mmap.c fix for specific versions'
      shell: bash
      if: ${{ inputs.kernel_version == '6.6' && inputs.android_version == 'android15' && inputs.sublevel <= '58' }}
      working-directory: ${{ github.workspace }}/kernel/common
      run: |
        echo "[INFO] Checking for android15 + kernel 6.6 include fix..."
        if [[ "${{ inputs.android_version }}" == "android15" && "${{ inputs.kernel_version }}" == "6.6" ]]; then
          echo "[MATCH] android15 + 6.6, checking for fs.h include."
          cd "$GITHUB_WORKSPACE/kernel/common"
          if ! grep -qxF '#include <trace/hooks/fs.h>' ./fs/namespace.c; then
            echo "[INFO] Adding missing #include <trace/hooks/fs.h> to fs/namespace.c."
            sed -i '/#include <trace\/hooks\/blk.h>/a #include <trace\/hooks\/fs.h>' ./fs/namespace.c
          else
            echo "[INFO] #include <trace/hooks/fs.h> already present."
          fi
        fi

    - name: 'Apply mmap.c fix for specific versions'
      shell: bash
      if: ${{ (inputs.kernel_version == '5.10' && inputs.android_version == 'android12' && inputs.sublevel == 226) || (inputs.kernel_version == '5.10' && inputs.android_version == 'android13' && inputs.sublevel == 223) || (inputs.kernel_version == '5.15' && inputs.android_version == 'android13' && inputs.sublevel == 167)  || (inputs.kernel_version == '5.10' && inputs.android_version == 'android13' && inputs.sublevel == 223) || (inputs.kernel_version == '5.15' && inputs.android_version == 'android14' && inputs.sublevel == 167) }}
      working-directory: ${{ github.workspace }}/kernel/common
      run: |
        echo "[INFO] Applying mmap.c fix for specific version combo."
        sed -i 's/\s*vm_flags_clear(new_vma, VM_PAD_MASK);/                new_vma->vm_flags \&= ~VM_PAD_MASK;/' mm/mmap.c