"""
Exercise Management Endpoints for Shinkan Jinkendo

Handles CRUD operations for exercises (Übungen).
"""
from typing import Optional
from fastapi import APIRouter, HTTPException, Depends, Query

from db import get_db, get_cursor, r2d
from auth import require_auth

router = APIRouter(prefix="/api", tags=["exercises"])


# ── List Exercises ────────────────────────────────────────────────────────
@router.get("/exercises")
def list_exercises(
    focus_area: Optional[str] = Query(default=None),
    visibility: Optional[str] = Query(default=None),
    status: Optional[str] = Query(default=None),
    skill_id: Optional[int] = Query(default=None),
    session=Depends(require_auth)
):
    """
    List exercises with optional filters.

    Filters:
    - focus_area: karate, selbstverteidigung, gewaltschutz
    - visibility: private, club, official
    - status: draft, in_review, approved, archived
    - skill_id: Filter by associated skill
    """
    profile_id = session['profile_id']

    with get_db() as conn:
        cur = get_cursor(conn)

        # Base query
        query = """
            SELECT DISTINCT e.*,
                p.name as creator_name,
                c.name as club_name,
                tm.name as primary_method_name
            FROM exercises e
            LEFT JOIN profiles p ON e.created_by = p.id
            LEFT JOIN clubs c ON e.club_id = c.id
            LEFT JOIN training_methods tm ON e.primary_method_id = tm.id
        """

        # Add skill join if filtering by skill
        if skill_id:
            query += " LEFT JOIN exercise_skills es ON e.id = es.exercise_id"

        # Build WHERE clause
        where = []
        params = []

        # Visibility filter: show own private + club + official
        where.append("(e.visibility = 'official' OR e.visibility = 'club' OR e.created_by = %s)")
        params.append(profile_id)

        if focus_area:
            where.append("e.focus_area = %s")
            params.append(focus_area)

        if visibility:
            where.append("e.visibility = %s")
            params.append(visibility)

        if status:
            where.append("e.status = %s")
            params.append(status)

        if skill_id:
            where.append("es.skill_id = %s")
            params.append(skill_id)

        if where:
            query += " WHERE " + " AND ".join(where)

        query += " ORDER BY e.created_at DESC"

        cur.execute(query, params)
        rows = cur.fetchall()
        return [r2d(r) for r in rows]


# ── Get Exercise ──────────────────────────────────────────────────────────
@router.get("/exercises/{exercise_id}")
def get_exercise(exercise_id: int, session=Depends(require_auth)):
    """Get exercise by ID with associated skills and variants."""
    profile_id = session['profile_id']

    with get_db() as conn:
        cur = get_cursor(conn)

        # Get exercise
        cur.execute("""
            SELECT e.*,
                p.name as creator_name,
                c.name as club_name,
                tm.name as primary_method_name
            FROM exercises e
            LEFT JOIN profiles p ON e.created_by = p.id
            LEFT JOIN clubs c ON e.club_id = c.id
            LEFT JOIN training_methods tm ON e.primary_method_id = tm.id
            WHERE e.id = %s
        """, (exercise_id,))
        exercise = cur.fetchone()

        if not exercise:
            raise HTTPException(404, "Übung nicht gefunden")

        exercise = r2d(exercise)

        # Check visibility
        if exercise['visibility'] == 'private' and exercise['created_by'] != profile_id:
            raise HTTPException(403, "Keine Berechtigung")

        # Get associated skills
        cur.execute("""
            SELECT es.*, s.name as skill_name, s.category as skill_category
            FROM exercise_skills es
            JOIN skills s ON es.skill_id = s.id
            WHERE es.exercise_id = %s
            ORDER BY es.is_primary DESC, s.name
        """, (exercise_id,))
        exercise['skills'] = [r2d(r) for r in cur.fetchall()]

        # Get variants
        cur.execute("""
            SELECT * FROM exercise_variants
            WHERE exercise_id = %s
            ORDER BY created_at
        """, (exercise_id,))
        exercise['variants'] = [r2d(r) for r in cur.fetchall()]

        # Get media
        cur.execute("""
            SELECT * FROM exercise_media
            WHERE exercise_id = %s
            ORDER BY sort_order, created_at
        """, (exercise_id,))
        exercise['media'] = [r2d(r) for r in cur.fetchall()]

        return exercise


# ── Create Exercise ───────────────────────────────────────────────────────
@router.post("/exercises")
def create_exercise(data: dict, session=Depends(require_auth)):
    """Create new exercise."""
    profile_id = session['profile_id']

    # Required fields
    title = data.get('title')
    goal = data.get('goal')
    execution = data.get('execution')

    if not title or not goal or not execution:
        raise HTTPException(400, "Titel, Ziel und Durchführung sind Pflichtfelder")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Insert exercise
        cur.execute("""
            INSERT INTO exercises (
                title, summary, goal, execution, preparation, trainer_notes,
                equipment, duration_min, duration_max, group_size_min, group_size_max,
                age_groups, focus_area, secondary_areas, training_character,
                primary_method_id, secondary_method_ids,
                visibility, status, created_by, club_id
            ) VALUES (
                %s, %s, %s, %s, %s, %s,
                %s, %s, %s, %s, %s,
                %s, %s, %s, %s,
                %s, %s,
                %s, %s, %s, %s
            ) RETURNING id
        """, (
            title,
            data.get('summary'),
            goal,
            execution,
            data.get('preparation'),
            data.get('trainer_notes'),
            data.get('equipment'),  # JSONB
            data.get('duration_min'),
            data.get('duration_max'),
            data.get('group_size_min'),
            data.get('group_size_max'),
            data.get('age_groups'),  # JSONB
            data.get('focus_area'),
            data.get('secondary_areas'),  # JSONB
            data.get('training_character'),
            data.get('primary_method_id'),
            data.get('secondary_method_ids'),  # JSONB
            data.get('visibility', 'private'),
            data.get('status', 'draft'),
            profile_id,
            data.get('club_id')
        ))

        exercise_id = cur.fetchone()['id']

        # Add skills if provided
        if data.get('skills'):
            for skill in data['skills']:
                cur.execute("""
                    INSERT INTO exercise_skills (
                        exercise_id, skill_id, is_primary, intensity,
                        development_contribution, required_level, target_level
                    ) VALUES (%s, %s, %s, %s, %s, %s, %s)
                """, (
                    exercise_id,
                    skill['skill_id'],
                    skill.get('is_primary', False),
                    skill.get('intensity'),
                    skill.get('development_contribution'),
                    skill.get('required_level'),
                    skill.get('target_level')
                ))

        conn.commit()

    return get_exercise(exercise_id, session)


# ── Update Exercise ───────────────────────────────────────────────────────
@router.put("/exercises/{exercise_id}")
def update_exercise(exercise_id: int, data: dict, session=Depends(require_auth)):
    """Update exercise."""
    profile_id = session['profile_id']

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check ownership
        cur.execute("SELECT created_by FROM exercises WHERE id = %s", (exercise_id,))
        row = cur.fetchone()
        if not row:
            raise HTTPException(404, "Übung nicht gefunden")

        if row['created_by'] != profile_id:
            raise HTTPException(403, "Keine Berechtigung")

        # Update exercise
        cur.execute("""
            UPDATE exercises SET
                title = %s, summary = %s, goal = %s, execution = %s,
                preparation = %s, trainer_notes = %s, equipment = %s,
                duration_min = %s, duration_max = %s,
                group_size_min = %s, group_size_max = %s,
                age_groups = %s, focus_area = %s, secondary_areas = %s,
                training_character = %s, primary_method_id = %s,
                secondary_method_ids = %s, visibility = %s, status = %s,
                club_id = %s, updated_at = NOW()
            WHERE id = %s
        """, (
            data.get('title'),
            data.get('summary'),
            data.get('goal'),
            data.get('execution'),
            data.get('preparation'),
            data.get('trainer_notes'),
            data.get('equipment'),
            data.get('duration_min'),
            data.get('duration_max'),
            data.get('group_size_min'),
            data.get('group_size_max'),
            data.get('age_groups'),
            data.get('focus_area'),
            data.get('secondary_areas'),
            data.get('training_character'),
            data.get('primary_method_id'),
            data.get('secondary_method_ids'),
            data.get('visibility'),
            data.get('status'),
            data.get('club_id'),
            exercise_id
        ))

        # Update skills if provided
        if 'skills' in data:
            # Delete existing skills
            cur.execute("DELETE FROM exercise_skills WHERE exercise_id = %s", (exercise_id,))

            # Add new skills
            for skill in data['skills']:
                cur.execute("""
                    INSERT INTO exercise_skills (
                        exercise_id, skill_id, is_primary, intensity,
                        development_contribution, required_level, target_level
                    ) VALUES (%s, %s, %s, %s, %s, %s, %s)
                """, (
                    exercise_id,
                    skill['skill_id'],
                    skill.get('is_primary', False),
                    skill.get('intensity'),
                    skill.get('development_contribution'),
                    skill.get('required_level'),
                    skill.get('target_level')
                ))

        conn.commit()

    return get_exercise(exercise_id, session)


# ── Delete Exercise ───────────────────────────────────────────────────────
@router.delete("/exercises/{exercise_id}")
def delete_exercise(exercise_id: int, session=Depends(require_auth)):
    """Delete exercise (only owner or admin)."""
    profile_id = session['profile_id']
    role = session.get('role')

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check ownership or admin
        cur.execute("SELECT created_by FROM exercises WHERE id = %s", (exercise_id,))
        row = cur.fetchone()
        if not row:
            raise HTTPException(404, "Übung nicht gefunden")

        if row['created_by'] != profile_id and role not in ['admin', 'superadmin']:
            raise HTTPException(403, "Keine Berechtigung")

        # Delete (CASCADE handles skills, variants, media)
        cur.execute("DELETE FROM exercises WHERE id = %s", (exercise_id,))
        conn.commit()

    return {"ok": True}