#!/usr/bin/env bash
#
# Get all work items (tickets) between two branches in Azure DevOps.
#
# Reports tickets from TWO sources:
#   1. Formally linked work items (git commit <-> work item links)
#   2. Ticket numbers scraped from commit messages (this repo references
#      tickets in text far more than it formally links them)
#
# Usage:
#   ./azdo-tickets-between-branches.sh <baseBranch> <targetBranch>
#
# Example:
#   ./azdo-tickets-between-branches.sh master release/5.4.0
#
# Requires: curl, jq
# Auth: set a Personal Access Token in AZDO_PAT (scopes: Code Read + Work Items Read).

set -euo pipefail

# ---- Config (override via env vars) -----------------------------------------
# Project collection base URL (host + collection), e.g. old visualstudio.com style.
COLLECTION_URL="${AZDO_COLLECTION_URL:-https://flashmobilevending.visualstudio.com/DefaultCollection}"
PROJECT="${AZDO_PROJECT:-GLU}"
REPO="${AZDO_REPO:-glu-flash-console}"
PAT="${AZDO_PAT:-}"
API_VERSION="7.1"
# Regex for ticket numbers in commit messages (this project uses 6-digit IDs).
TICKET_REGEX="${AZDO_TICKET_REGEX:-[0-9]{6}}"
# -----------------------------------------------------------------------------

BASE="${1:-}"
TARGET="${2:-}"

if [[ -z "$BASE" || -z "$TARGET" ]]; then
  echo "Usage: $0 <baseBranch> <targetBranch>" >&2
  echo "Example: $0 master release/5.4.0" >&2
  exit 1
fi

if [[ -z "$PAT" ]]; then
  echo "Error: set AZDO_PAT to a Personal Access Token (Code Read + Work Items Read)." >&2
  exit 1
fi

for cmd in curl jq; do
  command -v "$cmd" >/dev/null 2>&1 || { echo "Error: '$cmd' is required." >&2; exit 1; }
done

GIT_URL="${COLLECTION_URL}/${PROJECT}/_apis/git/repositories/${REPO}"
WIT_URL="${COLLECTION_URL}/${PROJECT}/_apis/wit/workitems"

# ---- Step 1: commits on TARGET but not on BASE, with linked work items -------
commits_json=$(curl -sf -u ":${PAT}" \
  "${GIT_URL}/commitsbatch?\$top=1000&api-version=${API_VERSION}" \
  -H "Content-Type: application/json" \
  -d "{
        \"itemVersion\":    {\"versionType\":\"branch\",\"version\":\"${BASE}\"},
        \"compareVersion\": {\"versionType\":\"branch\",\"version\":\"${TARGET}\"},
        \"includeWorkItems\": true
      }")

# 1a. Formally linked work item IDs
linked_ids=$(echo "$commits_json" | jq -r '[.value[].workItems[]?.id] | unique | .[]' || true)

# 1b. Ticket numbers scraped from commit messages.
#     Strip "Merged PR NNNNN" first so PR ids aren't mistaken for tickets.
scraped_ids=$(echo "$commits_json" \
  | jq -r '.value[].comment' \
  | sed -E 's/[Mm]erged PR [0-9]+//g' \
  | grep -oE "$TICKET_REGEX" \
  | sort -u || true)

# Union of both sources
all_ids=$(printf '%s\n%s\n' "$linked_ids" "$scraped_ids" | grep -E '^[0-9]+$' | sort -un || true)

commit_count=$(echo "$commits_json" | jq '.value | length')
echo "Comparing '${TARGET}' against '${BASE}'  (${commit_count} commits ahead)"
echo "  Formally linked:   $(echo "$linked_ids"  | grep -c . || true)"
echo "  Scraped from msgs: $(echo "$scraped_ids" | grep -c . || true)"
echo

if [[ -z "$all_ids" ]]; then
  echo "No tickets found (no links and no ticket numbers in commit messages)."
  exit 0
fi

# ---- Step 2: hydrate work item details --------------------------------------
ids_csv=$(echo "$all_ids" | paste -sd, -)

http_status=$(curl -s -o /tmp/azdo_wit.json -w "%{http_code}" -u ":${PAT}" \
  "${WIT_URL}?ids=${ids_csv}&fields=System.Id,System.WorkItemType,System.State,System.Title&errorPolicy=omit&api-version=${API_VERSION}")

if [[ "$http_status" != "200" ]]; then
  echo "Warning: could not fetch work item details (HTTP ${http_status})." >&2
  if [[ "$http_status" == "401" || "$http_status" == "403" ]]; then
    echo "         Your PAT is likely missing the 'Work Items (Read)' scope." >&2
  fi
  echo "         Falling back to ticket IDs only:" >&2
  echo
  echo "$all_ids"
  echo
  echo "View any of them at: ${COLLECTION_URL}/${PROJECT}/_workitems/edit/<id>"
  exit 0
fi

# errorPolicy=omit returns null entries for ids that aren't real work items;
# filter those out so scraped false-positives disappear.
{
  printf 'ID\tTYPE\tSTATE\tTITLE\n'
  jq -r '.value[] | select(. != null)
      | [ (.fields["System.Id"]|tostring),
          .fields["System.WorkItemType"],
          .fields["System.State"],
          (.fields["System.Title"] // "") ]
      | @tsv' /tmp/azdo_wit.json
} | column -t -s $'\t'