#!/usr/bin/env python3
"""
get-task

Retrieves detailed information and metadata for a specific task in docs/tasks.md.
Usage:
    ./scripts/get-task EX-018
    ./scripts/get-task 18 --json
    ./scripts/get-task EX-099 --description-only
"""

import argparse
import importlib.machinery
import importlib.util
import json
import re
import sys
from pathlib import Path


def load_update_tasks_module():
    script_dir = Path(__file__).resolve().parent
    update_script = script_dir / "update-tasks"
    if not update_script.exists():
        raise FileNotFoundError(f"Could not find update-tasks at {update_script}")
    loader = importlib.machinery.SourceFileLoader("update_tasks", str(update_script))
    spec = importlib.util.spec_from_loader("update_tasks", loader)
    if spec is None:
        raise ImportError(f"Could not load spec for {update_script}")
    mod = importlib.util.module_from_spec(spec)
    loader.exec_module(mod)
    return mod


def parse_task_id(id_str):
    return load_update_tasks_module().parse_task_id(id_str)


def get_task(task_id_input, tasks_file=None):
    update_mod = load_update_tasks_module()
    tasks_path = update_mod.find_tasks_file(tasks_file)

    with open(tasks_path, "r", encoding="utf-8") as f:
        text = f.read()

    fm_data = update_mod.read_frontmatter(text)
    prefix = update_mod.get_task_id_prefix(fm_data)
    target_num = update_mod.parse_task_id(task_id_input)

    detail_header_marker = "## Detailed Tasks\n"
    detail_start = text.find(detail_header_marker)
    if detail_start == -1:
        raise ValueError("## Detailed Tasks heading not found")

    notes_marker = "\n---\n\n## Notes\n"
    notes_start = text.find(notes_marker)
    if notes_start == -1:
        notes_start = len(text)

    detail_body = text[detail_start + len(detail_header_marker) : notes_start]
    task_chunks = re.split(r"(?=<a\s+[^>]*\bid=|<id=)", detail_body)

    for chunk in task_chunks:
        chunk_clean = chunk.strip()
        if not chunk_clean:
            continue
        m = re.search(update_mod.TASK_ID_PATTERN, chunk_clean, re.IGNORECASE)
        if m and int(m.group(2)) == target_num and update_mod.task_id_matches(task_id_input, m.group(1), prefix):
            anchor_match = re.search(update_mod.TASK_ANCHOR_PATTERN, chunk_clean, re.IGNORECASE)
            anchor_tag = anchor_match.group(1) if anchor_match else ""

            proj_m = re.search(r'data-project=["\']([^"\']+)["\']', anchor_tag)
            subproj_m = re.search(r'data-subproject=["\']([^"\']*)["\']', anchor_tag)
            status_m = re.search(r'data-status=["\']([^"\']+)["\']', anchor_tag)
            type_m = re.search(r'data-task-type=["\']([^"\']+)["\']', anchor_tag)
            epic_m = re.search(r'data-epic=["\']([^"\']*)["\']', anchor_tag)
            epic, epic_label = update_mod.resolve_epic(epic_m.group(1) if epic_m else None, fm_data)

            if not subproj_m:
                subproj_field_m = re.search(r'^\*\*Subproject:\*\*\s*([^\n]+)$', chunk_clean, re.MULTILINE)
                subproject = subproj_field_m.group(1).strip() if subproj_field_m else ""
            else:
                subproject = subproj_m.group(1).strip()

            title_m = re.search(r'^###\s+(.+)$', chunk_clean, re.MULTILINE)
            title = title_m.group(1).strip() if title_m else f"Task {target_num}"

            desc_m = re.search(r'\*\*Description:\*\*\s*\n(.*)$', chunk_clean, re.DOTALL)
            description = desc_m.group(1).strip() if desc_m else ""

            digit_width = max(3, len(m.group(1).rsplit("-", 1)[1]))
            formatted_id = update_mod.format_task_id(target_num, prefix, digit_width)
            formatted_aid = m.group(1)

            return {
                "number": target_num,
                "id": formatted_id,
                "anchor_id": formatted_aid,
                "title": title,
                "project": proj_m.group(1) if proj_m else "shared",
                "subproject": subproject,
                "epic": epic,
                "epic_label": epic_label,
                "status": status_m.group(1) if status_m else "triage",
                "type": type_m.group(1) if type_m else "feature",
                "description": description,
                "raw_markdown": chunk_clean,
                "file_path": str(tasks_path),
            }

    raise KeyError(f"Task {task_id_input} ({update_mod.format_task_id(target_num, prefix)}) was not found in {tasks_path}")


def main():
    parser = argparse.ArgumentParser(description="Get detailed info and metadata for a task in tasks.md")
    parser.add_argument("task_id", help="Task number or prefixed ID (e.g. 18, PREFIX-018)")
    parser.add_argument("-j", "--json", action="store_true", help="Output details as JSON")
    parser.add_argument("-d", "--description", "--description-only", dest="description", action="store_true", help="Output description and checklist")
    parser.add_argument("--id", action="store_true", help="Output task ID only")
    parser.add_argument("--title", action="store_true", help="Output task title only")
    parser.add_argument("--project", action="store_true", help="Output task project only")
    parser.add_argument("--subproject", action="store_true", help="Output task subproject only")
    parser.add_argument("--epic", action="store_true", help="Output task epic value only")
    parser.add_argument("--status", action="store_true", help="Output task status only")
    parser.add_argument("--type", action="store_true", help="Output task type only")
    parser.add_argument("-m", "--metadata-only", action="store_true", help="Output metadata header attributes only")
    parser.add_argument("-f", "--file", default=None, help="Path to tasks.md (optional)")

    args = parser.parse_args()

    try:
        task = get_task(args.task_id, tasks_file=args.file)
        if args.json:
            print(json.dumps(task, indent=2))
        elif args.metadata_only:
            print(f"ID: {task['id']}")
            print(f"Title: {task['title']}")
            print(f"Project: {task['project']}")
            if task.get("subproject"):
                print(f"Subproject: {task['subproject']}")
            if task.get("epic"):
                print(f"Epic: {task['epic_label']}")
            print(f"Status: {task['status']}")
            print(f"Type: {task['type']}")
        elif any([args.id, args.title, args.project, args.subproject, args.epic, args.status, args.type, args.description]):
            output_parts = []
            if args.id:
                output_parts.append(task["id"])
            if args.title:
                output_parts.append(task["title"])
            if args.project:
                output_parts.append(task["project"])
            if args.subproject:
                output_parts.append(task["subproject"])
            if args.epic:
                output_parts.append(task["epic"])
            if args.status:
                output_parts.append(task["status"])
            if args.type:
                output_parts.append(task["type"])
            if args.description:
                output_parts.append(task["description"])
            for part in output_parts:
                print(part)
        else:
            print(task["raw_markdown"])
    except Exception as e:
        sys.stderr.write(f"Error: {e}\n")
        sys.exit(1)


if __name__ == "__main__":
    main()