"""Single source of truth for 'what is this workout day' copy (calendar + API)."""

from __future__ import annotations

from sqlmodel import Session

from tracker.models import Exercise, ProgramExercise


def build_program_day_summary_lines(
    day_exercises: list[ProgramExercise],
    session: Session,
) -> list[str]:
    """Bullet lines in program order (same grouping rules as the workout UI)."""
    lines: list[str] = []
    idx = 0
    while idx < len(day_exercises):
        pe = day_exercises[idx]
        exercise = session.get(Exercise, pe.exercise_id)
        if exercise is None:
            idx += 1
            continue
        one = f"{exercise.name}: {pe.target_sets}x{pe.target_rep_min}-{pe.target_rep_max}"
        if pe.superset_group is None:
            lines.append(f"- {one}")
            idx += 1
            continue
        group_id = pe.superset_group
        chunk: list[str] = [one]
        idx += 1
        while idx < len(day_exercises) and day_exercises[idx].superset_group == group_id:
            pe2 = day_exercises[idx]
            ex2 = session.get(Exercise, pe2.exercise_id)
            if ex2 is None:
                idx += 1
                continue
            chunk.append(f"{ex2.name}: {pe2.target_sets}x{pe2.target_rep_min}-{pe2.target_rep_max}")
            idx += 1
        if len(chunk) > 1:
            lines.append("- SUPERSET: " + " / ".join(chunk))
        else:
            lines.append(f"- {chunk[0]}")
    return lines


def build_program_day_summary_text(
    day_exercises: list[ProgramExercise],
    session: Session,
    *,
    tracker_base_url: str | None,
) -> str:
    """Plain text block. Optional tracker URL line matches calendar scheduling."""
    body = "\n".join(build_program_day_summary_lines(day_exercises, session))
    if tracker_base_url is None or tracker_base_url == "":
        return body
    base = tracker_base_url.rstrip("/")
    return f"{body}\n\nTracker: {base}/"