#!/usr/bin/env bash

set -euo pipefail
# debug:
# set -x

START_REF="${1}"
END_REF="${2:-upstream/master}"

# Get the merge base
MERGE_BASE=$(git merge-base "$START_REF" "$END_REF")
unset START_REF

# Get date range
START_DATE=$(git show -s --format=%cI "$MERGE_BASE")
END_DATE=$(git show -s --format=%cI "$END_REF")

echo "Checking PRs merged between $START_DATE and $END_DATE" >&2

# Get all commits between merge base and HEAD
COMMITS=$(git rev-list "$MERGE_BASE..$END_REF")

# Convert to set for fast lookup
declare -A commit_set
for commit in $COMMITS; do
    commit_set["$commit"]=1
done

# Get the current changelog
LOG_DONE="$(changelog-d doc/manual/rl-next)"
is_done(){
    local nr="$1"
    echo "$LOG_DONE" | grep -E "^- .*/pull/$nr)"
}

# Query merged PRs in date range
gh pr list \
    --repo NixOS/nix \
    --state merged \
    --limit 1000 \
    --json number,title,author,mergeCommit \
    --search "merged:$START_DATE..$END_DATE" | \
jq -r '.[] | [.number, .mergeCommit.oid, .title, .author.login] | @tsv' | \
while IFS=$'\t' read -r pr_num merge_commit _title author; do
    # Check if this PR's merge commit is in our branch
    if [[ -n "${commit_set[$merge_commit]:-}" ]]; then
        # Full detail, not suitable for comment due to mass ping and duplicate title
        # echo "- #$pr_num $_title (@$author)"
        echo "- #$pr_num ($author)"
        if is_done "$pr_num"
        then
            echo "  - [x] has note"
        else
            echo "  - [ ] has note"
        fi
        echo "  - [ ] skip"
    fi
done