"""
Kin CLI — command-line interface for the multi-agent orchestrator.
Uses core.models for all data access, never raw SQL.
"""

import json
import sys
from pathlib import Path

import click

# Ensure project root is on sys.path
sys.path.insert(0, str(Path(__file__).parent.parent))

from core.db import init_db
from core import models
from agents.bootstrap import (
    detect_tech_stack, detect_modules, extract_decisions_from_claude_md,
    find_vault_root, scan_obsidian, format_preview, save_to_db,
)

DEFAULT_DB = Path.home() / ".kin" / "kin.db"


def get_conn(db_path: Path = DEFAULT_DB):
    db_path.parent.mkdir(parents=True, exist_ok=True)
    return init_db(db_path)


def _parse_json(ctx, param, value):
    """Click callback: parse a JSON string or return None."""
    if value is None:
        return None
    try:
        return json.loads(value)
    except json.JSONDecodeError:
        raise click.BadParameter(f"Invalid JSON: {value}")


def _table(headers: list[str], rows: list[list[str]], min_width: int = 6):
    """Render a simple aligned text table."""
    widths = [max(min_width, len(h)) for h in headers]
    for row in rows:
        for i, cell in enumerate(row):
            if i < len(widths):
                widths[i] = max(widths[i], len(str(cell)))
    fmt = "  ".join(f"{{:<{w}}}" for w in widths)
    lines = [fmt.format(*headers), fmt.format(*("-" * w for w in widths))]
    for row in rows:
        lines.append(fmt.format(*[str(c) for c in row]))
    return "\n".join(lines)


def _auto_task_id(conn, project_id: str) -> str:
    """Generate next task ID like PROJ-001."""
    prefix = project_id.upper()
    existing = models.list_tasks(conn, project_id=project_id)
    max_num = 0
    for t in existing:
        tid = t["id"]
        if tid.startswith(prefix + "-"):
            try:
                num = int(tid.split("-", 1)[1])
                max_num = max(max_num, num)
            except ValueError:
                pass
    return f"{prefix}-{max_num + 1:03d}"


# ===========================================================================
# Root group
# ===========================================================================

@click.group()
@click.option("--db", type=click.Path(), default=None, envvar="KIN_DB",
              help="Path to kin.db (default: ~/.kin/kin.db, or $KIN_DB)")
@click.pass_context
def cli(ctx, db):
    """Kin — multi-agent project orchestrator."""
    ctx.ensure_object(dict)
    db_path = Path(db) if db else DEFAULT_DB
    ctx.obj["conn"] = get_conn(db_path)


# ===========================================================================
# project
# ===========================================================================

@cli.group()
def project():
    """Manage projects."""


@project.command("add")
@click.argument("id")
@click.argument("name")
@click.argument("path")
@click.option("--tech-stack", callback=_parse_json, default=None, help='JSON array, e.g. \'["vue3","nuxt"]\'')
@click.option("--status", default="active")
@click.option("--priority", type=int, default=5)
@click.option("--language", default="ru", help="Response language for agents (ru, en, etc.)")
@click.pass_context
def project_add(ctx, id, name, path, tech_stack, status, priority, language):
    """Add a new project."""
    conn = ctx.obj["conn"]
    p = models.create_project(conn, id, name, path,
                              tech_stack=tech_stack, status=status, priority=priority,
                              language=language)
    click.echo(f"Created project: {p['id']} ({p['name']})")


@project.command("list")
@click.option("--status", default=None)
@click.pass_context
def project_list(ctx, status):
    """List projects."""
    conn = ctx.obj["conn"]
    projects = models.list_projects(conn, status=status)
    if not projects:
        click.echo("No projects found.")
        return
    rows = [[p["id"], p["name"], p["status"], str(p["priority"]), p["path"]]
            for p in projects]
    click.echo(_table(["ID", "Name", "Status", "Pri", "Path"], rows))


@project.command("show")
@click.argument("id")
@click.pass_context
def project_show(ctx, id):
    """Show project details."""
    conn = ctx.obj["conn"]
    p = models.get_project(conn, id)
    if not p:
        click.echo(f"Project '{id}' not found.", err=True)
        raise SystemExit(1)
    click.echo(f"Project: {p['id']}")
    click.echo(f"  Name:       {p['name']}")
    click.echo(f"  Path:       {p['path']}")
    click.echo(f"  Status:     {p['status']}")
    click.echo(f"  Priority:   {p['priority']}")
    if p.get("tech_stack"):
        click.echo(f"  Tech stack: {', '.join(p['tech_stack'])}")
    if p.get("forgejo_repo"):
        click.echo(f"  Forgejo:    {p['forgejo_repo']}")
    click.echo(f"  Created:    {p['created_at']}")


# ===========================================================================
# task
# ===========================================================================

@cli.group()
def task():
    """Manage tasks."""


@task.command("add")
@click.argument("project_id")
@click.argument("title")
@click.option("--type", "route_type", type=click.Choice(["debug", "feature", "refactor", "hotfix"]), default=None)
@click.option("--priority", type=int, default=5)
@click.pass_context
def task_add(ctx, project_id, title, route_type, priority):
    """Add a task to a project. ID is auto-generated (PROJ-001)."""
    conn = ctx.obj["conn"]
    p = models.get_project(conn, project_id)
    if not p:
        click.echo(f"Project '{project_id}' not found.", err=True)
        raise SystemExit(1)
    task_id = _auto_task_id(conn, project_id)
    brief = {"route_type": route_type} if route_type else None
    t = models.create_task(conn, task_id, project_id, title,
                           priority=priority, brief=brief)
    click.echo(f"Created task: {t['id']} — {t['title']}")


@task.command("list")
@click.option("--project", "project_id", default=None)
@click.option("--status", default=None)
@click.pass_context
def task_list(ctx, project_id, status):
    """List tasks."""
    conn = ctx.obj["conn"]
    tasks = models.list_tasks(conn, project_id=project_id, status=status)
    if not tasks:
        click.echo("No tasks found.")
        return
    rows = [[t["id"], t["project_id"], t["title"][:40], t["status"],
             str(t["priority"]), t.get("assigned_role") or "-"]
            for t in tasks]
    click.echo(_table(["ID", "Project", "Title", "Status", "Pri", "Role"], rows))


@task.command("show")
@click.argument("id")
@click.pass_context
def task_show(ctx, id):
    """Show task details."""
    conn = ctx.obj["conn"]
    t = models.get_task(conn, id)
    if not t:
        click.echo(f"Task '{id}' not found.", err=True)
        raise SystemExit(1)
    click.echo(f"Task: {t['id']}")
    click.echo(f"  Project:  {t['project_id']}")
    click.echo(f"  Title:    {t['title']}")
    click.echo(f"  Status:   {t['status']}")
    click.echo(f"  Priority: {t['priority']}")
    if t.get("assigned_role"):
        click.echo(f"  Role:     {t['assigned_role']}")
    if t.get("parent_task_id"):
        click.echo(f"  Parent:   {t['parent_task_id']}")
    if t.get("brief"):
        click.echo(f"  Brief:    {json.dumps(t['brief'], ensure_ascii=False)}")
    if t.get("spec"):
        click.echo(f"  Spec:     {json.dumps(t['spec'], ensure_ascii=False)}")
    click.echo(f"  Created:  {t['created_at']}")
    click.echo(f"  Updated:  {t['updated_at']}")


# ===========================================================================
# decision
# ===========================================================================

@cli.group()
def decision():
    """Manage decisions and gotchas."""


@decision.command("add")
@click.argument("project_id")
@click.argument("type", type=click.Choice(["decision", "gotcha", "workaround", "rejected_approach", "convention"]))
@click.argument("title")
@click.argument("description")
@click.option("--category", default=None)
@click.option("--tags", callback=_parse_json, default=None, help='JSON array, e.g. \'["ios","css"]\'')
@click.option("--task-id", default=None)
@click.pass_context
def decision_add(ctx, project_id, type, title, description, category, tags, task_id):
    """Record a decision, gotcha, or convention."""
    conn = ctx.obj["conn"]
    p = models.get_project(conn, project_id)
    if not p:
        click.echo(f"Project '{project_id}' not found.", err=True)
        raise SystemExit(1)
    d = models.add_decision(conn, project_id, type, title, description,
                            category=category, tags=tags, task_id=task_id)
    click.echo(f"Added {d['type']}: #{d['id']} — {d['title']}")


@decision.command("list")
@click.argument("project_id")
@click.option("--category", default=None)
@click.option("--tag", multiple=True, help="Filter by tag (can repeat)")
@click.option("--type", "types", multiple=True,
              type=click.Choice(["decision", "gotcha", "workaround", "rejected_approach", "convention"]),
              help="Filter by type (can repeat)")
@click.pass_context
def decision_list(ctx, project_id, category, tag, types):
    """List decisions for a project."""
    conn = ctx.obj["conn"]
    tags_list = list(tag) if tag else None
    types_list = list(types) if types else None
    decisions = models.get_decisions(conn, project_id, category=category,
                                     tags=tags_list, types=types_list)
    if not decisions:
        click.echo("No decisions found.")
        return
    rows = [[str(d["id"]), d["type"], d["category"] or "-",
             d["title"][:50], d["created_at"][:10]]
            for d in decisions]
    click.echo(_table(["#", "Type", "Category", "Title", "Date"], rows))


# ===========================================================================
# module
# ===========================================================================

@cli.group()
def module():
    """Manage project modules."""


@module.command("add")
@click.argument("project_id")
@click.argument("name")
@click.argument("type", type=click.Choice(["frontend", "backend", "shared", "infra"]))
@click.argument("path")
@click.option("--description", default=None)
@click.option("--owner-role", default=None)
@click.pass_context
def module_add(ctx, project_id, name, type, path, description, owner_role):
    """Register a project module."""
    conn = ctx.obj["conn"]
    p = models.get_project(conn, project_id)
    if not p:
        click.echo(f"Project '{project_id}' not found.", err=True)
        raise SystemExit(1)
    m = models.add_module(conn, project_id, name, type, path,
                          description=description, owner_role=owner_role)
    click.echo(f"Added module: {m['name']} ({m['type']}) at {m['path']}")


@module.command("list")
@click.argument("project_id")
@click.pass_context
def module_list(ctx, project_id):
    """List modules for a project."""
    conn = ctx.obj["conn"]
    mods = models.get_modules(conn, project_id)
    if not mods:
        click.echo("No modules found.")
        return
    rows = [[m["name"], m["type"], m["path"], m.get("owner_role") or "-",
             m.get("description") or ""]
            for m in mods]
    click.echo(_table(["Name", "Type", "Path", "Owner", "Description"], rows))


# ===========================================================================
# status
# ===========================================================================

@cli.command("status")
@click.argument("project_id", required=False)
@click.pass_context
def status(ctx, project_id):
    """Project status overview. Without args — all projects. With id — detailed."""
    conn = ctx.obj["conn"]

    if project_id:
        p = models.get_project(conn, project_id)
        if not p:
            click.echo(f"Project '{project_id}' not found.", err=True)
            raise SystemExit(1)
        tasks = models.list_tasks(conn, project_id=project_id)
        counts = {}
        for t in tasks:
            counts[t["status"]] = counts.get(t["status"], 0) + 1

        click.echo(f"Project: {p['id']} — {p['name']} [{p['status']}]")
        click.echo(f"  Path: {p['path']}")
        if p.get("tech_stack"):
            click.echo(f"  Stack: {', '.join(p['tech_stack'])}")
        click.echo(f"  Tasks: {len(tasks)} total")
        for s in ["pending", "in_progress", "review", "done", "blocked"]:
            if counts.get(s, 0) > 0:
                click.echo(f"    {s}: {counts[s]}")
        if tasks:
            click.echo("")
            rows = [[t["id"], t["title"][:40], t["status"],
                     t.get("assigned_role") or "-"]
                    for t in tasks]
            click.echo(_table(["ID", "Title", "Status", "Role"], rows))
    else:
        summary = models.get_project_summary(conn)
        if not summary:
            click.echo("No projects.")
            return
        rows = [[s["id"], s["name"][:25], s["status"], str(s["priority"]),
                 str(s["total_tasks"]), str(s["done_tasks"]),
                 str(s["active_tasks"]), str(s["blocked_tasks"])]
                for s in summary]
        click.echo(_table(
            ["ID", "Name", "Status", "Pri", "Total", "Done", "Active", "Blocked"],
            rows,
        ))


# ===========================================================================
# cost
# ===========================================================================

@cli.command("cost")
@click.option("--last", "period", default="7d", help="Period: 7d, 30d, etc.")
@click.pass_context
def cost(ctx, period):
    """Show cost summary by project."""
    # Parse period like "7d", "30d"
    period = period.strip().lower()
    if period.endswith("d"):
        try:
            days = int(period[:-1])
        except ValueError:
            click.echo(f"Invalid period: {period}. Use e.g. 7d, 30d.", err=True)
            raise SystemExit(1)
    else:
        try:
            days = int(period)
        except ValueError:
            click.echo(f"Invalid period: {period}. Use e.g. 7d, 30d.", err=True)
            raise SystemExit(1)

    conn = ctx.obj["conn"]
    costs = models.get_cost_summary(conn, days=days)
    if not costs:
        click.echo(f"No agent runs in the last {days} days.")
        return
    rows = [[c["project_id"], c["project_name"][:25], str(c["runs"]),
             f"{c['total_tokens']:,}", f"${c['total_cost_usd']:.4f}",
             f"{c['total_duration_seconds']}s"]
            for c in costs]
    click.echo(f"Cost summary (last {days} days):\n")
    click.echo(_table(
        ["Project", "Name", "Runs", "Tokens", "Cost", "Time"],
        rows,
    ))
    total = sum(c["total_cost_usd"] for c in costs)
    click.echo(f"\nTotal: ${total:.4f}")


# ===========================================================================
# run
# ===========================================================================

@cli.command("run")
@click.argument("task_id")
@click.option("--dry-run", is_flag=True, help="Show pipeline plan without executing")
@click.pass_context
def run_task(ctx, task_id, dry_run):
    """Run a task through the agent pipeline.

    PM decomposes the task into specialist steps, then the pipeline executes.
    With --dry-run, shows the plan without running agents.
    """
    from agents.runner import run_agent, run_pipeline

    conn = ctx.obj["conn"]
    task = models.get_task(conn, task_id)
    if not task:
        click.echo(f"Task '{task_id}' not found.", err=True)
        raise SystemExit(1)

    project_id = task["project_id"]
    click.echo(f"Task: {task['id']} — {task['title']}")

    # Step 1: PM decomposes
    click.echo("Running PM to decompose task...")
    pm_result = run_agent(
        conn, "pm", task_id, project_id,
        model="sonnet", dry_run=dry_run,
    )

    if dry_run:
        click.echo("\n--- PM Prompt (dry-run) ---")
        click.echo(pm_result.get("prompt", "")[:2000])
        click.echo("\n(Dry-run: PM would produce a pipeline JSON)")
        return

    if not pm_result["success"]:
        click.echo(f"PM failed: {pm_result.get('output', 'unknown error')}", err=True)
        raise SystemExit(1)

    # Parse PM output for pipeline
    output = pm_result.get("output")
    if isinstance(output, str):
        try:
            output = json.loads(output)
        except json.JSONDecodeError:
            click.echo(f"PM returned non-JSON output:\n{output[:500]}", err=True)
            raise SystemExit(1)

    if not isinstance(output, dict) or "pipeline" not in output:
        click.echo(f"PM output missing 'pipeline' key:\n{json.dumps(output, indent=2)[:500]}", err=True)
        raise SystemExit(1)

    pipeline_steps = output["pipeline"]
    analysis = output.get("analysis", "")

    click.echo(f"\nAnalysis: {analysis}")
    click.echo(f"Pipeline ({len(pipeline_steps)} steps):")
    for i, step in enumerate(pipeline_steps, 1):
        click.echo(f"  {i}. {step['role']} ({step.get('model', 'sonnet')}): {step.get('brief', '')}")

    if not click.confirm("\nExecute pipeline?"):
        click.echo("Aborted.")
        return

    # Step 2: Execute pipeline
    click.echo("\nExecuting pipeline...")
    result = run_pipeline(conn, task_id, pipeline_steps)

    if result["success"]:
        click.echo(f"\nPipeline completed: {result['steps_completed']} steps")
    else:
        click.echo(f"\nPipeline failed at step: {result.get('error', 'unknown')}", err=True)

    if result.get("total_cost_usd"):
        click.echo(f"Cost: ${result['total_cost_usd']:.4f}")
    if result.get("total_duration_seconds"):
        click.echo(f"Duration: {result['total_duration_seconds']}s")


# ===========================================================================
# bootstrap
# ===========================================================================

@cli.command("bootstrap")
@click.argument("path", type=click.Path(exists=True))
@click.option("--id", "project_id", required=True, help="Short project ID (e.g. vdol)")
@click.option("--name", required=True, help="Project display name")
@click.option("--vault", "vault_path", type=click.Path(), default=None,
              help="Obsidian vault path (auto-detected if omitted)")
@click.option("-y", "--yes", is_flag=True, help="Skip confirmation")
@click.pass_context
def bootstrap(ctx, path, project_id, name, vault_path, yes):
    """Auto-detect project stack, modules, decisions and import into Kin."""
    conn = ctx.obj["conn"]
    project_path = Path(path).expanduser().resolve()

    # Check if project already exists
    existing = models.get_project(conn, project_id)
    if existing:
        click.echo(f"Project '{project_id}' already exists. Use 'kin project show {project_id}'.", err=True)
        raise SystemExit(1)

    # Detect everything
    click.echo(f"Scanning {project_path} ...")
    tech_stack = detect_tech_stack(project_path)
    modules = detect_modules(project_path)
    decisions = extract_decisions_from_claude_md(project_path, project_id, name)

    # Obsidian
    obsidian = None
    vault_root = find_vault_root(Path(vault_path) if vault_path else None)
    if vault_root:
        dir_name = project_path.name
        obsidian = scan_obsidian(vault_root, project_id, name, dir_name)
        if not obsidian["tasks"] and not obsidian["decisions"]:
            obsidian = None  # Nothing found, don't clutter output

    # Preview
    click.echo("")
    click.echo(format_preview(
        project_id, name, str(project_path), tech_stack,
        modules, decisions, obsidian,
    ))
    click.echo("")

    if not yes:
        if not click.confirm("Save to kin.db?"):
            click.echo("Aborted.")
            return

    save_to_db(conn, project_id, name, str(project_path),
               tech_stack, modules, decisions, obsidian)

    # Summary
    task_count = 0
    dec_count = len(decisions)
    if obsidian:
        task_count += len(obsidian.get("tasks", []))
        dec_count += len(obsidian.get("decisions", []))

    click.echo(f"Saved: 1 project, {len(modules)} modules, "
               f"{dec_count} decisions, {task_count} tasks.")


# ===========================================================================
# Entry point
# ===========================================================================

if __name__ == "__main__":
    cli()