#!/bin/bash
cd ${0%/*} || exit 1    # Run from this directory

# Source tutorial run functions
. $WM_PROJECT_DIR/bin/tools/RunFunctions

# Get the serial/parallel mode
! isTest "$@" && [ -n "$1" ] && mode=$1 || mode=serial

# Set global geometric variables using values in constant/fluid/dynamicMeshDict
SCALE=10
SCALE_INV=$(echo "1.0 / $SCALE" | bc -l)

STROKE0=$(foamDictionary constant/fluid/dynamicMeshDict -writePrecision 12 \
    -entry mover/piston/motion/stroke -value)
STROKE=$(echo "$SCALE * $STROKE0" | bc -l)

CONROD_LENGTH0=$(foamDictionary constant/fluid/dynamicMeshDict -writePrecision 12 \
    -entry mover/piston/motion/conRodLength -value)
CONROD_LENGTH=$(echo "$SCALE * $CONROD_LENGTH0" | bc -l)

TDC_CLEARANCE=10

# Define mesh generation functions...

createSingleValveBaseMesh()
{
    local mesh=$1
    local valveLift=-$2
    local nGap=$3
    local pistonPos=-$4
    local nClearance=$5

    [ $2 == "0" ] && valveState=valveClosed || valveState=valveOpen

    foamDictionary system/blockMeshDict.$valveState -set " \
        valveLift=$valveLift, \
        nValve=$nGap, \
        x0=-5, \
        nXLeft=4, \
        pistonPos=$pistonPos, \
        nPiston=$nClearance"

    runApplication -a blockMesh ${mesh:+-mesh} $mesh \
                   -dict system/blockMeshDict.$valveState

    runApplication -a mirrorMesh ${mesh:+-mesh} $mesh \
                   -dict system/mirrorMeshDict
}

createExhaustValveMesh()
{
    local mesh=$1

    createSingleValveBaseMesh "$mesh" $2 $3 $4 $5

    runApplication -a transformPoints ${mesh:+-mesh} $mesh "translate=(-6 0 0)"

    foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -rename " \
        entry0/valveHead=evHead, \
        entry0/valveStem=evStem, \
        entry0/liner=nonCouple_ev_cyl, \
        entry0/inlet=outlet"
    foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -set \
        "entry0/nonCouple_ev_cyl/type=patch"
    foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -remove \
        -entry entry0/nonCouple_ev_cyl/inGroups
}

createIntakeValveMesh()
{
    local mesh=$1

    createSingleValveBaseMesh "$mesh" $2 $3 $4 $5

    runApplication -a transformPoints ${mesh:+-mesh} $mesh "translate=(6 0 0)"

    foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -rename " \
        entry0/valveHead=ivHead, \
        entry0/valveStem=ivStem, \
        entry0/liner=nonCouple_iv_cyl"
    foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -set \
        "entry0/nonCouple_iv_cyl/type=patch"
    foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -remove \
        -entry entry0/nonCouple_iv_cyl/inGroups
}

createCylinderMesh()
{
    local region=fluid

    local mesh=$1
    local pistonPos=-$2
    local nClearance=$3

    foamDictionary system/blockMeshDict.cylinder -set " \
        pistonPos=$pistonPos,
        nPiston=$nClearance"

    runApplication -a blockMesh ${mesh:+-mesh} $mesh -region $region \
        -dict system/blockMeshDict.cylinder
}

createLinerMesh()
{
    local region=liner

    local linerTop=$1
    local linerBottom=$2
    local linerRadius=$3
    local linerThickness=$4

    foamDictionary system/blockMeshDict.$region -set " \
        linerTop=$linerTop,
        linerBottom=$linerBottom,
        linerRadius=$linerRadius,
        linerThickness=$linerThickness"

    runApplication -a blockMesh -region $region \
        -dict system/blockMeshDict.$region

    runApplication -a transformPoints -region $region \
        "Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}

createCylinderHeadMesh()
{
    local region=cylinderHead

    runApplication -a blockMesh -region $region \
        -dict system/blockMeshDict.$region

    runApplication -a transformPoints -region $region \
        "Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}

createValveMeshes()
{
    local region=exhaustValve

    runApplication -a blockMesh -region $region \
        -dict system/blockMeshDict.$region

    runApplication -a transformPoints -region $region \
        "Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"

    local region=intakeValve

    runApplication -a blockMesh -region $region \
        -dict system/blockMeshDict.$region

    runApplication -a transformPoints -region $region \
        "Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}

createPistonMesh()
{
    local region=piston

    local pistonPos=-$1
    local pistonOppositePos=-$2
    local nPistonBase=$3

    foamDictionary system/blockMeshDict.$region -set " \
        pPos=$pistonPos,
        pPos2=$pistonOppositePos,
        pRes=$nPistonBase"

    runApplication -a blockMesh -region $region \
        -dict system/blockMeshDict.$region

    runApplication -a transformPoints -region $region \
        "Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}

pistonPositionFromTDC()
{
    local cad=$1

    local pi=$(echo "scale=10; 4*a(1)" | bc -l)
    local theta=$(echo "$cad*($pi/180)" | bc -l)

    # - r: position from the crank center
    local term1="$CONROD_LENGTH * $CONROD_LENGTH"
    local term2="($STROKE * s($theta) / 2.0) * ($STROKE * s($theta) / 2.0)"
    local r=$(echo "$STROKE * c($theta) / 2.0 + sqrt( $term1 - $term2 )" | bc -l)

    # - pos: position from tdc
    local pos=$(echo "$CONROD_LENGTH + $STROKE / 2.0 - $r" | bc -l)

    echo $pos
}

round()
{
    printf %.$2f $(echo "scale=$2;(((10^$2)*$1)+0.5)/(10^$2)" | bc)
}

createFluidMesh()
{
    local region=fluid

    local mesh=$1
    local ivLift=$2
    local evLift=$3

    local pistonPos=$(echo "$(pistonPositionFromTDC ${mesh:-0}) + $TDC_CLEARANCE" | bc -l)

    local nCyl0=3
    local nV0=3
    local oneByDx=3
    local nIV=$(( $nV0 + $oneByDx*$(round $ivLift 0) ))
    local nEV=$(( $nV0 + $oneByDx*$(round $evLift 0) ))
    local nCyl=$(( $nCyl0 + $oneByDx*$(round $pistonPos 0) ))
    local nCylIV=$(( $nCyl0 + $oneByDx*$(round "($pistonPos - $ivLift)" 0) ))
    local nCylEV=$(( $nCyl0 + $oneByDx*$(round "($pistonPos - $evLift)" 0) ))

    # Create the fluid mesh modules
    createCylinderMesh "$mesh" $pistonPos $nCyl
    createExhaustValveMesh _tmp_exhaust $evLift $nEV $pistonPos $nCylEV
    createIntakeValveMesh _tmp_intake $ivLift $nIV $pistonPos $nCylIV

    # Combine the fluid mesh modules
    runApplication -a mergeMeshes ${mesh:+-mesh} $mesh -region $region \
                   -addMeshes '(_tmp_exhaust _tmp_intake)'

    # Delete temporary valve meshes
    rm -rf constant/meshes/_tmp*

    # Separate ports to mimic complicated engine assembly
    runApplication -a createBaffles ${mesh:+-mesh} $mesh -region $region \
                   -dict system/createBafflesDict
    runApplication -a splitBaffles ${mesh:+-mesh} $mesh -region $region

    runApplication -a transformPoints ${mesh:+-mesh} $mesh -region $region \
                   "Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"

    # Decompose (if necessary) and construct the non-conformal couplings that
    # connect the ports and enable the sliding interfaces and thermally couple
    # the fluid and solid regions
    case $mode in
        serial)
            runApplication -a createNonConformalCouples ${mesh:+-mesh} $mesh \
                           -dict system/createNonConformalCouplesDict
            ;;
        parallel)
            [ -z $mesh ] && regions=-allRegions || regions="-region fluid"

            runApplication -a decomposePar ${mesh:+-mesh} $mesh $regions -noFields

            runParallel -a createNonConformalCouples ${mesh:+-mesh} $mesh \
                        -dict system/createNonConformalCouplesDict
            ;;
                *)
        echo "Error: mode $mode not recognised"
        exit 1
        ;;
    esac
}

# Generate the solid meshes
createLinerMesh 0 -30 13 1

createCylinderHeadMesh

nPistonBase=18
pistonThickness=5.0

pistonPos=$(echo "$(pistonPositionFromTDC ${mesh:-0}) + $TDC_CLEARANCE" | bc -l)
pistonOppositePos=$(echo "$pistonPos + $pistonThickness" | bc --mathlib)

createPistonMesh $pistonPos $pistonOppositePos $nPistonBase

createValveMeshes

# Generate the fluid mesh
createFluidMesh "" 0 0

# Generate the fluid meshes. Valve lift values are chosen to align with the
# lift profile values defined in the constant/fluid/dynamicMeshDict.
createFluidMesh 0 0 0
# (EV opens)
createFluidMesh 100 0 0.1
createFluidMesh 120 0 0.5
createFluidMesh 140 0 0.9
createFluidMesh 180 0 1.7
createFluidMesh 200 0 2.1
createFluidMesh 220 0 2.5
createFluidMesh 300 0 1.7
# (IV opens)
createFluidMesh 340 0.1 0.9
createFluidMesh 345 0.2 0.8
createFluidMesh 350 0.3 0.7
createFluidMesh 360 0.5 0.5
createFluidMesh 370 0.7 0.3
# (EV closes)
createFluidMesh 380 0.9 0
createFluidMesh 390 1.1 0
createFluidMesh 410 1.5 0
createFluidMesh 440 2.1 0
createFluidMesh 460 2.5 0
createFluidMesh 520 2.1 0
createFluidMesh 550 1.5 0
createFluidMesh 580 0.9 0
createFluidMesh 600 0.5 0
createFluidMesh 610 0.3 0
# (IV closes)
createFluidMesh 620 0 0

# Create the list of mesh times
ls constant/meshes | sort -n > constant/fluid/meshTimes

#------------------------------------------------------------------------------