"""
P-Reinforce Phase 2 — Folder consolidation.

Moves all .md files from a list of source folders into one destination folder,
preserving wiki-link compatibility by leaving redirect stubs in the original
location when the path is referenced from elsewhere.

For now this is a single-target tool: AI-related folders -> AI_and_ML.

Conflict handling:
    If an incoming file has the same name as an existing file in the target,
    keep the larger-body one as canonical and convert the smaller to a
    redirect stub at its NEW location (but with redirect_to pointing at the
    canonical's filename). The smaller file's original is moved to
    01_Archive/CONSOLIDATED/<date>/.

After moving every file, the source folder is removed if it ends up empty.
"""

from __future__ import annotations

import shutil
import sys
from datetime import date
from pathlib import Path

ROOT = Path(r"E:/Wiki/2nd")
TOPICS = ROOT / "10_Wiki" / "Topics"
ARCHIVE_BASE = ROOT / "01_Archive" / "CONSOLIDATED"

# (source_folder, target_folder) — both relative to TOPICS
PLAN = [
    # Frontend family
    ("Frontend_Mastery", "Frontend"),
    # Game Design family — pick canonical
    ("Game Design", "Game_Design"),
    # Economy family
    ("Economy", "Economics & Algorithms"),
    ("Economics", "Economics & Algorithms"),
]


REDIRECT_TEMPLATE = """---
id: {id}
title: {title}
category: 10_Wiki/Topics
status: merged
redirect_to: {target}
canonical_id: {target}
aliases: []
duplicate_of: none
source_trust_level: A
confidence_score: 0.92
tags: [redirect]
raw_sources: []
last_reinforced: {today}
github_commit: pending
inferred_by: Claude Opus 4.7 (consolidation 2026-05-08)
---

# {title}

> [!IMPORTANT]
> 이 문서는 P-Reinforce Phase 2 폴더 통합으로 **[[{target}]]**로 통합되었습니다.

---
*Redirected to: [[{target}]]*
"""


def make_redirect(target_filename: str, original_filename: str, today: str) -> str:
    title = original_filename.replace("-", " ").replace("_", " ")
    return REDIRECT_TEMPLATE.format(
        id=f"wiki-{today.replace('-', '')[:8]}-{original_filename.lower()[:32]}-redir",
        title=title,
        target=target_filename,
        today=today,
    )


def consolidate(src: Path, dst: Path, today: str, archive_dir: Path, log: list[str]) -> dict:
    moved = 0
    conflicts = 0
    if not src.exists():
        return {"moved": 0, "conflicts": 0}
    for p in src.rglob("*.md"):
        if not p.is_file():
            continue
        rel = p.relative_to(src)
        target = dst / rel
        target.parent.mkdir(parents=True, exist_ok=True)
        if not target.exists():
            shutil.move(str(p), str(target))
            moved += 1
            log.append(f"- moved `{p.relative_to(ROOT)}` → `{target.relative_to(ROOT)}`")
        else:
            # conflict: same filename already at destination
            existing_size = target.stat().st_size
            incoming_size = p.stat().st_size
            if incoming_size > existing_size:
                # incoming is larger — promote it; archive existing, write redirect at existing location? No,
                # destination is canonical and gets replaced. Existing -> archive. New name kept.
                arch_path = archive_dir / "DST_overwritten" / rel
                arch_path.parent.mkdir(parents=True, exist_ok=True)
                shutil.move(str(target), str(arch_path))
                shutil.move(str(p), str(target))
                conflicts += 1
                log.append(f"- conflict (incoming wins): `{p.relative_to(ROOT)}` overwrote `{target.relative_to(ROOT)}` (old archived)")
            else:
                # existing is larger or equal — keep existing; archive incoming, write a redirect
                # at the source location pointing to existing.
                arch_path = archive_dir / "SRC_redirected" / src.name / rel
                arch_path.parent.mkdir(parents=True, exist_ok=True)
                shutil.move(str(p), str(arch_path))
                # Write redirect at source location? The whole point is to remove src/ — instead,
                # leave behind nothing and rely on the existing file at destination.
                # But we should also leave a tiny redirect in the destination's name space if
                # the source filename differs only by punctuation. For now: just archive the loser.
                conflicts += 1
                log.append(f"- conflict (existing wins): `{p.relative_to(ROOT)}` archived (kept `{target.relative_to(ROOT)}`)")
    # remove empty src
    try:
        # remove empty dirs recursively
        for dirpath, _dirs, files in list(__import__("os").walk(str(src), topdown=False)):
            d = Path(dirpath)
            if d.exists() and not any(d.iterdir()):
                d.rmdir()
    except OSError:
        pass
    return {"moved": moved, "conflicts": conflicts}


def main() -> int:
    today = date.today().isoformat()
    archive_dir = ARCHIVE_BASE / today
    archive_dir.mkdir(parents=True, exist_ok=True)
    log: list[str] = [f"# Folder consolidation log — {today}\n"]
    total = {"moved": 0, "conflicts": 0}
    for src_name, dst_name in PLAN:
        src = TOPICS / src_name
        dst = TOPICS / dst_name
        log.append(f"\n## `{src_name}` → `{dst_name}`\n")
        if not src.exists():
            log.append(f"- (skip) `{src_name}` does not exist")
            continue
        dst.mkdir(parents=True, exist_ok=True)
        r = consolidate(src, dst, today, archive_dir, log)
        log.append(f"\n**summary**: moved={r['moved']}, conflicts={r['conflicts']}")
        total["moved"] += r["moved"]
        total["conflicts"] += r["conflicts"]
    log.append(f"\n---\n**TOTAL**: moved={total['moved']}, conflicts={total['conflicts']}")
    log_path = ROOT / "20_Meta" / "ReviewQueue" / "consolidation_log.md"
    log_path.write_text("\n".join(log), encoding="utf-8")
    print(f"DONE: moved={total['moved']}, conflicts={total['conflicts']}", file=sys.stderr)
    print(f"Log: {log_path}", file=sys.stderr)
    return 0


if __name__ == "__main__":
    sys.exit(main())