#!/usr/bin/env bash
# Create a PR on Forgejo via tea and record it in the request log.
#
# Usage:
#   .claude/scripts/create-pr.sh <title> [body] [base]
#
# Environment:
#   FORGEJO_BASE_BRANCH  — override default base branch (default: main)

set -euo pipefail

TITLE="${1:-}"
BODY="${2:-}"
BASE="${3:-${FORGEJO_BASE_BRANCH:-main}}"
LOG_FILE=".claude/request-log.jsonl"

if [ -z "$TITLE" ]; then
  echo "Usage: create-pr.sh <title> [body] [base-branch]" >&2
  exit 1
fi

if ! command -v tea &>/dev/null; then
  cat >&2 <<'MSG'
Error: 'tea' CLI not found.

Install options:
  nix develop path:~/.claude/workflows/forgejo   # recommended
  brew install gitea/tap/tea                      # macOS
  go install gitea.com/gitea/tea@latest           # Go

Then configure: tea login add
MSG
  exit 1
fi

CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)

if [ "$CURRENT_BRANCH" = "$BASE" ]; then
  echo "Error: currently on base branch '$BASE'. Create a feature branch first." >&2
  exit 1
fi

echo "Creating PR: '$TITLE'"
echo "  head: $CURRENT_BRANCH → base: $BASE"
echo ""

# Build tea args
TEA_ARGS=(pr create
  --title "$TITLE"
  --head  "$CURRENT_BRANCH"
  --base  "$BASE"
)

if [ -n "$BODY" ]; then
  TEA_ARGS+=(--description "$BODY")
fi

PR_OUTPUT=$(tea "${TEA_ARGS[@]}" 2>&1)
echo "$PR_OUTPUT"

# Extract URL — tea prints something like: "Created pull request #42"
# and/or a URL line
PR_URL=$(echo "$PR_OUTPUT" | grep -oE 'https?://[^[:space:]]+/pulls/[0-9]+' | head -1 || true)
PR_NUMBER=$(echo "$PR_URL" | grep -oE '[0-9]+$' || true)

if [ -z "$PR_NUMBER" ]; then
  # Fallback: parse "Created pull request #N"
  PR_NUMBER=$(echo "$PR_OUTPUT" | grep -oE '#[0-9]+' | grep -oE '[0-9]+' | head -1 || true)
fi

# Update most recent pending entry in the log
if [ -n "$PR_NUMBER" ] && [ -f "$LOG_FILE" ] && [ -s "$LOG_FILE" ]; then
  TMPFILE=$(mktemp)

  # Find and update the last entry that matches current branch & is pending
  awk -v branch="$CURRENT_BRANCH" -v pr_num="$PR_NUMBER" -v pr_url="$PR_URL" '
    BEGIN { updated = 0 }
    {
      lines[NR] = $0
    }
    END {
      # Walk backwards to find last matching entry
      for (i = NR; i >= 1; i--) {
        if (!updated && lines[i] ~ ("\"branch\":\"" branch "\"") && lines[i] ~ "\"status\":\"pending\"") {
          # Use a simple substitution — jq would be cleaner but we avoid a subshell per line
          cmd = "echo " lines[i] " | jq --arg pn \"" pr_num "\" --arg pu \"" pr_url "\" \".pr_number = ($pn | tonumber) | .pr_url = $pu | .status = \\\"open\\\"\""
          cmd | getline updated_line
          close(cmd)
          lines[i] = updated_line
          updated = 1
        }
      }
      for (i = 1; i <= NR; i++) print lines[i]
    }
  ' "$LOG_FILE" > "$TMPFILE"

  mv "$TMPFILE" "$LOG_FILE"
  echo ""
  echo "Request log updated with PR #$PR_NUMBER"
fi