#!/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. Adapted from crossbar's tools/run-plan.sh.
#
# Usage:   tools/run-plan.sh docs/plans/<plan> [FIRST]      FIRST is a task number such as 03
# Options (environment):
#   SIFT_MODEL       model to use (default llama.cpp/ornith-1.5-35b-a3b)
#   OPENCODE_FLAGS   extra flags for `opencode run` (default --pure)
#   DRY_RUN=1        print what would be run and stop
set -eu

plan="${1:?usage: tools/run-plan.sh docs/plans/<plan> [FIRST]}"
first="${2:-00}"
model="${SIFT_MODEL:-llama.cpp/ornith-1.5-35b-a3b}"
flags="${OPENCODE_FLAGS:---pure}"
log=docs/implementer-log.md
milestone=$(basename "$plan")
runs=".state/runs/$milestone"
# The model's own name for the attribution trailer: the part after the provider prefix.
mname="${model#*/}"
trailer="Co-Authored-By: $mname <$mname@llama.cpp.invalid>"

[ -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 "$first" ] || continue
    prompt="Read \`AGENTS.md\`, then read \`$task\` and do exactly that task. Your commit message must end with this exact trailer line: $trailer"

    if [ "${DRY_RUN:-0}" = 1 ]; then
        echo "opencode run -m $model $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 $(date '+%H:%M:%S')"
    # shellcheck disable=SC2086
    # </dev/null: OpenCode 1.15 reads a piped stdin as extra prompt and waits for EOF, so a
    # backgrounded driver would hang before the first model request (2026-09-25).
    # timeout: a looping session (P5a task 06 ran 3 h) ends at SESSION_MAX seconds (default 90 min).
    if ! timeout "${SESSION_MAX:-5400}" opencode run -m "$model" $flags --title "$milestone/$name" "$prompt" </dev/null \
        > "$runs/$name.log" 2>&1; then
        echo "run-plan: opencode exited with an error (or hit SESSION_MAX) in $name; see $runs/$name.log" >&2
        exit 1
    fi
    echo "=== $milestone/$name: session ended $(date '+%H:%M:%S')"

    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: $name left uncommitted changes; stopping" >&2
        exit 1
    fi
    if ! git log -1 --format=%B | grep -qxF "$trailer"; then
        echo "run-plan: $name's commit lacks the trailer '$trailer'; stopping" >&2
        exit 1
    fi
    if ! grep -Eq "^\| *$milestone/$name *\|[^|]*\| *done *\|" "$log"; then
        echo "run-plan: $name has no 'done' row in $log; stopping" >&2
        exit 1
    fi
    echo "=== $milestone/$name: ok ($(git rev-parse --short HEAD))"
done
echo "run-plan: all tasks done"