#!/bin/bash

##
## leaseassist — Leasehackr Rate Findr lease data (residuals, money factors,
## incentives) pulled through a logged-in browser tab.
##
## chromeassist runs the Rate Findr API calls in-page, so your supporter
## session supplies auth. Needs a Rate Findr tab open and signed in.
##

CMD=$(basename $0)
TMP=$HOME/.tmp/$CMD ; mkdir -p $TMP

TENTEN_DIR=$(dirname $(dirname $(realpath "$0")))
LIBEXEC=$TENTEN_DIR/libexec/$CMD
CONFIG=$TENTEN_DIR/config/$CMD/default.config
[ -f "$CONFIG" ] && . "$CONFIG"

TAB=${TAB:-calculator.leasehackr}

usage() {
  echo "Usage: $CMD -a models -k make -y year [-b tab]"
  echo "       $CMD -a trims  -k make -o model -y year [-b tab]"
  echo "       $CMD -a deal   -k make -o model -t trim -y year -l term -d miles [-z zip] [-b tab] [-v]"
  echo ""
  echo "  -b   browser tab (chromeassist match string/id; default: $TAB)"
  echo "  -k   make (e.g. Hyundai)            -o  model (e.g. 'Santa Fe')"
  echo "  -t   trim (e.g. 'Calligraphy AWD')  -y  model year"
  echo "  -l   lease term months             -d  annual miles"
  echo "  -z   zipcode (incentives are region-specific; default: ${ZIP:-none})"
  echo "  -v   raw JSON instead of |-delimited output"
  echo ""
  echo "  trims output: style_id|trim"
  echo "  deal  output: program|delivery|mf|apr|rv|exp|incentives"
  exit 1
}

unset ACTION MAKE MODEL TRIM YEAR TERM MILES VERBOSE
while getopts ":a:b:k:o:t:y:l:d:z:vh" o; do
  case "$o" in
    a) ACTION=$OPTARG ;;
    b) TAB=$OPTARG ;;
    k) MAKE=$OPTARG ;;
    o) MODEL=$OPTARG ;;
    t) TRIM=$OPTARG ;;
    y) YEAR=$OPTARG ;;
    l) TERM=$OPTARG ;;
    d) MILES=$OPTARG ;;
    z) ZIP=$OPTARG ;;
    v) VERBOSE=1 ;;
    *|h) usage ;;
  esac
done

## Runs the Rate Findr client in-page with ARGS; exits on its { err }.
run_ratefindr() {
  local args
  args=$(jq -n \
    --arg action "$ACTION" --arg make "$MAKE" --arg model "$MODEL" \
    --arg trim "$TRIM" --arg year "$YEAR" --arg term "$TERM" \
    --arg miles "$MILES" --arg zip "$ZIP" \
    '{action:$action,make:$make,model:$model,trim:$trim,year:$year,term:$term,miles:$miles,zip:$zip}')
  local js="var ARGS=$args;
$(cat "$LIBEXEC/ratefindr.js")"
  local out
  out=$(chromeassist -a js -t "$TAB" -e "$js") || { echo "$CMD: chromeassist failed (is the Rate Findr tab open?)" >&2; exit 1; }
  local err
  err=$(echo "$out" | jq -r '.err // empty' 2>/dev/null)
  [ -n "$err" ] && { echo "$CMD: $err" >&2; exit 1; }
  echo "$out"
}

case "$ACTION" in

  models)
    [ -z "$MAKE" ] || [ -z "$YEAR" ] && usage
    out=$(run_ratefindr) || exit 1
    if [ -n "$VERBOSE" ]; then echo "$out" | jq .
    else echo "$out" | jq -r '.models[]'; fi
    ;;

  trims)
    [ -z "$MAKE" ] || [ -z "$MODEL" ] || [ -z "$YEAR" ] && usage
    out=$(run_ratefindr) || exit 1
    if [ -n "$VERBOSE" ]; then echo "$out" | jq .
    else echo "$out" | jq -r '.trims[] | "\(.id)|\(.trim)"'; fi
    ;;

  deal)
    [ -z "$MAKE" ] || [ -z "$MODEL" ] || [ -z "$TRIM" ] || [ -z "$YEAR" ] || [ -z "$TERM" ] || [ -z "$MILES" ] && usage
    [ -z "$ZIP" ] && { echo "$CMD: -z zip required for deal (incentives are region-specific)" >&2; exit 1; }
    out=$(run_ratefindr) || exit 1
    if [ -n "$VERBOSE" ]; then
      echo "$out" | jq .
    else
      echo "$out" | jq -r '.programs[] |
        [ .program, .delivery, (.mf|tostring), ((.apr|tostring)+"%"), ((.rv|tostring)+"%"), .exp_date,
          ([.incentives[] | "\(.name) $\(.value)"] | join("; "))
        ] | join("|")'
    fi
    ;;

  *) usage ;;
esac