"""
Kin — Research Phase Pipeline (KIN-059).

Sequential workflow: Director describes a new project, picks researcher roles,
each phase produces a task for review. After approve → next phase activates.
Architect always runs last (auto-added when any researcher is selected).
"""

import sqlite3

from core import models

# Canonical order of research roles (architect always last)
RESEARCH_ROLES = [
    "business_analyst",
    "market_researcher",
    "legal_researcher",
    "tech_researcher",
    "ux_designer",
    "marketer",
    "architect",
]

# Human-readable labels
ROLE_LABELS = {
    "business_analyst": "Business Analyst",
    "market_researcher": "Market Researcher",
    "legal_researcher": "Legal Researcher",
    "tech_researcher": "Tech Researcher",
    "ux_designer": "UX Designer",
    "marketer": "Marketer",
    "architect": "Architect",
}


def validate_roles(roles: list[str]) -> list[str]:
    """Filter unknown roles, remove duplicates, strip 'architect' (auto-added later)."""
    seen: set[str] = set()
    result = []
    for r in roles:
        r = r.strip().lower()
        if r == "architect":
            continue
        if r in RESEARCH_ROLES and r not in seen:
            seen.add(r)
            result.append(r)
    return result


def build_phase_order(selected_roles: list[str]) -> list[str]:
    """Return roles in canonical RESEARCH_ROLES order, append architect if any selected."""
    ordered = [r for r in RESEARCH_ROLES if r in selected_roles and r != "architect"]
    if ordered:
        ordered.append("architect")
    return ordered


def create_project_with_phases(
    conn: sqlite3.Connection,
    id: str,
    name: str,
    path: str,
    description: str,
    selected_roles: list[str],
    tech_stack: list | None = None,
    priority: int = 5,
    language: str = "ru",
) -> dict:
    """Create project + sequential research phases.

    Returns {project, phases}.
    """
    clean_roles = validate_roles(selected_roles)
    ordered_roles = build_phase_order(clean_roles)
    if not ordered_roles:
        raise ValueError("At least one research role must be selected")

    project = models.create_project(
        conn, id, name, path,
        tech_stack=tech_stack, priority=priority, language=language,
        description=description,
    )

    phases = []
    for idx, role in enumerate(ordered_roles):
        phase = models.create_phase(conn, id, role, idx)
        phases.append(phase)

    # Activate the first phase immediately
    if phases:
        phases[0] = activate_phase(conn, phases[0]["id"])

    return {"project": project, "phases": phases}


def activate_phase(conn: sqlite3.Connection, phase_id: int) -> dict:
    """Create a task for the phase and set it to active.

    Task brief includes project description + phase context.
    """
    phase = models.get_phase(conn, phase_id)
    if not phase:
        raise ValueError(f"Phase {phase_id} not found")

    project = models.get_project(conn, phase["project_id"])
    if not project:
        raise ValueError(f"Project {phase['project_id']} not found")

    task_id = models.next_task_id(conn, phase["project_id"], category=None)
    brief = {
        "text": project.get("description") or project["name"],
        "phase": phase["role"],
        "phase_order": phase["phase_order"],
        "workflow": "research",
    }
    task = models.create_task(
        conn, task_id, phase["project_id"],
        title=f"[Research] {ROLE_LABELS.get(phase['role'], phase['role'])}",
        assigned_role=phase["role"],
        brief=brief,
        status="pending",
        category=None,
    )
    updated = models.update_phase(conn, phase_id, task_id=task["id"], status="active")
    return updated


def approve_phase(conn: sqlite3.Connection, phase_id: int) -> dict:
    """Approve a phase, activate the next one (or finish workflow).

    Returns {phase, next_phase|None}.
    """
    phase = models.get_phase(conn, phase_id)
    if not phase:
        raise ValueError(f"Phase {phase_id} not found")
    if phase["status"] != "active":
        raise ValueError(f"Phase {phase_id} is not active (current: {phase['status']})")

    updated = models.update_phase(conn, phase_id, status="approved")

    # Find next pending phase
    all_phases = models.list_phases(conn, phase["project_id"])
    next_phase = None
    for p in all_phases:
        if p["phase_order"] > phase["phase_order"] and p["status"] == "pending":
            next_phase = p
            break

    if next_phase:
        activated = activate_phase(conn, next_phase["id"])
        return {"phase": updated, "next_phase": activated}

    return {"phase": updated, "next_phase": None}


def reject_phase(conn: sqlite3.Connection, phase_id: int, reason: str) -> dict:
    """Reject a phase (director rejects the research output entirely)."""
    phase = models.get_phase(conn, phase_id)
    if not phase:
        raise ValueError(f"Phase {phase_id} not found")
    if phase["status"] != "active":
        raise ValueError(f"Phase {phase_id} is not active (current: {phase['status']})")

    return models.update_phase(conn, phase_id, status="rejected")


def revise_phase(conn: sqlite3.Connection, phase_id: int, comment: str) -> dict:
    """Request revision: create a new task for the same role with the comment.

    Returns {phase, new_task}.
    """
    phase = models.get_phase(conn, phase_id)
    if not phase:
        raise ValueError(f"Phase {phase_id} not found")
    if phase["status"] not in ("active", "revising"):
        raise ValueError(
            f"Phase {phase_id} cannot be revised (current: {phase['status']})"
        )

    project = models.get_project(conn, phase["project_id"])
    if not project:
        raise ValueError(f"Project {phase['project_id']} not found")

    new_task_id = models.next_task_id(conn, phase["project_id"], category=None)
    brief = {
        "text": project.get("description") or project["name"],
        "phase": phase["role"],
        "phase_order": phase["phase_order"],
        "workflow": "research",
        "revise_comment": comment,
        "revise_count": (phase.get("revise_count") or 0) + 1,
    }
    new_task = models.create_task(
        conn, new_task_id, phase["project_id"],
        title=f"[Research Revise] {ROLE_LABELS.get(phase['role'], phase['role'])}",
        assigned_role=phase["role"],
        brief=brief,
        status="pending",
        category=None,
    )
    new_revise_count = (phase.get("revise_count") or 0) + 1
    updated = models.update_phase(
        conn, phase_id,
        status="revising",
        task_id=new_task["id"],
        revise_count=new_revise_count,
    )
    return {"phase": updated, "new_task": new_task}