from __future__ import annotations

import json
from typing import Any, Dict

from .types import BuildReport


def format_report(report: BuildReport, db_selfcheck: Dict[str, Any], show_per_person: bool = True) -> str:
    lines = []
    lines.append("==== build report ====")
    lines.append(f"total_person_dirs: {report.total_person_dirs}")
    lines.append(f"enrolled_persons:  {report.enrolled_persons}")
    lines.append(f"total_images:     {report.total_images}")
    lines.append(f"processed_images: {report.processed_images}")
    lines.append(f"ok_images:        {report.ok_images}")
    lines.append(f"failed_images:    {report.failed_images}")
    lines.append("\n-- failure reasons --")
    if report.failure_reasons:
        for k in sorted(report.failure_reasons.keys()):
            lines.append(f"{k}: {report.failure_reasons[k]}")
    else:
        lines.append("(none)")

    if show_per_person:
        lines.append("\n-- per person used samples --")
        for name in sorted(report.per_person_used.keys()):
            lines.append(f"{name}: {report.per_person_used[name]}")

        if report.skipped_persons:
            lines.append("\n-- persons skipped (no valid embeddings) --")
            for name in sorted(set(report.skipped_persons)):
                fails = report.per_person_failed.get(name, [])
                lines.append(f"{name}: failed_images={len(fails)}")
                if fails:
                    reason_cnt: Dict[str, int] = {}
                    for _path, r, _detail in fails:
                        reason_cnt[str(r)] = reason_cnt.get(str(r), 0) + 1
                    lines.append("  reasons: " + ", ".join([f"{k}={reason_cnt[k]}" for k in sorted(reason_cnt.keys())]))
                    for path, r, detail in fails[:3]:
                        lines.append(f"  sample: {r} {path} | {detail}")

    lines.append("\n-- db selfcheck --")
    lines.append(json.dumps(db_selfcheck, ensure_ascii=False, indent=2))
    return "\n".join(lines)