#!/bin/sh
# Runs the tasks of a plan one after another, each in its own fresh OpenCode session, and stops
# at the first task that does not end cleanly. This is the owner's tool; the implementing model
# never runs it.
#
# Usage:   tools/run-plan.sh docs/plans/M2a [FIRST]      FIRST is a task number such as 04
# Options (environment):
#   BOXMAKER_MODEL   model to use (default straylight/laguna-s-2.1; OpenCode's own default differs)
#   OPENCODE_FLAGS   extra flags for `opencode run`, for example "--pure" or "--auto"
#   DRY_RUN=1        print what would be run and stop
set -eu

plan="${1:?usage: tools/run-plan.sh docs/plans/<milestone> [FIRST]}"
first="${2:-00}"
model="${BOXMAKER_MODEL:-straylight/laguna-s-2.1}"
log=docs/implementer-log.md
milestone=$(basename "$plan")
runs=".state/runs/$milestone"

[ -d "$plan" ] || { echo "run-plan: $plan is not a directory" >&2; exit 2; }
[ -f "$log" ] || { echo "run-plan: run this from the repository root" >&2; exit 2; }
mkdir -p "$runs"

for task in "$plan"/[0-9][0-9]-*.md; do
    name=$(basename "$task" .md)
    number=$(echo "$name" | cut -c1-2)
    [ "$number" -ge "$first" ] || continue
    prompt="Read \`$task\` and do exactly that task."

    if [ "${DRY_RUN:-0}" = 1 ]; then
        echo "opencode run -m $model ${OPENCODE_FLAGS:-} --title $milestone/$name \"$prompt\""
        continue
    fi
    if [ -n "$(git status --porcelain)" ]; then
        echo "run-plan: the working tree is not clean before $name; stopping" >&2
        exit 1
    fi

    before=$(git rev-parse HEAD)
    echo "=== $milestone/$name: started $(date '+%H:%M:%S')"
    # A new `opencode run` is a new session: nothing carries over from the task before.
    # shellcheck disable=SC2086
    if ! opencode run -m "$model" ${OPENCODE_FLAGS:-} --title "$milestone/$name" "$prompt" \
        > "$runs/$name.log" 2>&1; then
        echo "run-plan: opencode exited with an error in $name; see $runs/$name.log" >&2
        exit 1
    fi
    echo "=== $milestone/$name: session ended $(date '+%H:%M:%S')"

    # The task must have left exactly what AGENTS.md asks for: a commit, a clean tree, and a
    # `done` row in the log. Anything else needs a person, so stop.
    if [ "$(git rev-parse HEAD)" = "$before" ]; then
        echo "run-plan: $name made no commit; stopping" >&2
        exit 1
    fi
    if [ -n "$(git status --porcelain)" ]; then
        echo "run-plan: $name left uncommitted changes; stopping" >&2
        exit 1
    fi
    if ! grep -Eq "^\| *$milestone/$name *\|[^|]*\| *done *\|" "$log"; then
        echo "run-plan: no 'done' row for $milestone/$name in $log; stopping" >&2
        grep -E "^\| *$milestone/$name *\|" "$log" >&2 || true
        exit 1
    fi
    echo "=== $milestone/$name: done ($(git log -1 --format=%h))"
done
echo "run-plan: every task from $first on ended cleanly. Ready for review."