#!/bin/bash
# Script to add resolution preset support to main.go
# This script will guide you through the manual changes needed

echo "================================================================"
echo "Resolution Preset Integration Script"
echo "================================================================"
echo ""
echo "Since main.go is in .gitignore, please make the following changes manually:"
echo ""

cat << 'EOF'

STEP 1: Add Resolution field to EncodingOptions struct
-------------------------------------------------------
Find the EncodingOptions struct (search for "type EncodingOptions struct")
Add this field:

    Resolution string  // Resolution preset (480p, 720p, 1080p, original)


STEP 2: Add resolution flag in parseFlags() function
----------------------------------------------------
Find where flags are defined (search for "flag.String" or "flag.Bool")
Add this line with the other flag definitions:

    resolution := flag.String("resolution", "", "Target resolution (480p, 720p, 1080p, original)")

Then in the EncodingOptions initialization, add:

    Resolution: *resolution,


STEP 3: Integrate into encodeFile() function
--------------------------------------------
Find the encodeFile() function and locate where FFmpeg command is built.
Add this code BEFORE building the FFmpeg command:

    // Build scale filter for resolution preset
    scaleFilter := ""
    if opts.Resolution != "" {
        filter, err := encoding.BuildScaleFilter(file, opts.Resolution)
        if err != nil {
            fmt.Printf("⚠️  Warning: Could not build scale filter: %v\n", err)
        } else if filter != "" {
            scaleFilter = filter
            targetHeight := encoding.GetResolutionPresetHeight(opts.Resolution)
            fmt.Printf("📐 Scaling video to %dp\n", targetHeight)
        }
    }

Then when building the FFmpeg args array, if scaleFilter is not empty,
add it to the command arguments (typically after video codec args).


STEP 4: Update printHelp() function
-----------------------------------
Find the printHelp() function and add in the appropriate section:

    fmt.Println("\n📐 Resolution Options:")
    fmt.Println("  --resolution <preset>     Scale video to target resolution")
    fmt.Println("                            Options: 480p, 720p, 1080p, original")
    fmt.Println("                            Only scales down, never upscales")


EOF

echo ""
echo "================================================================"
echo "After making these changes:"
echo "  1. Save main.go"
echo "  2. Run: make clean && make build"
echo "  3. Test with: ./build/gwencoder --help"
echo "================================================================"