-- Migration 027: Focus Areas System (Goal System v2.0)
-- Date: 2026-03-27
-- Purpose: Replace single primary goal with weighted multi-goal system

-- ============================================================================
-- Focus Areas Table
-- ============================================================================

CREATE TABLE IF NOT EXISTS focus_areas (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    profile_id UUID NOT NULL REFERENCES profiles(id) ON DELETE CASCADE,

    -- Six focus dimensions (percentages, sum = 100)
    weight_loss_pct INTEGER DEFAULT 0 CHECK (weight_loss_pct >= 0 AND weight_loss_pct <= 100),
    muscle_gain_pct INTEGER DEFAULT 0 CHECK (muscle_gain_pct >= 0 AND muscle_gain_pct <= 100),
    strength_pct INTEGER DEFAULT 0 CHECK (strength_pct >= 0 AND strength_pct <= 100),
    endurance_pct INTEGER DEFAULT 0 CHECK (endurance_pct >= 0 AND endurance_pct <= 100),
    flexibility_pct INTEGER DEFAULT 0 CHECK (flexibility_pct >= 0 AND flexibility_pct <= 100),
    health_pct INTEGER DEFAULT 0 CHECK (health_pct >= 0 AND health_pct <= 100),

    -- Status
    active BOOLEAN DEFAULT true,

    -- Audit
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),

    -- Constraints
    CONSTRAINT sum_equals_100 CHECK (
        weight_loss_pct + muscle_gain_pct + strength_pct +
        endurance_pct + flexibility_pct + health_pct = 100
    )
);

-- Only one active focus_areas per profile
CREATE UNIQUE INDEX IF NOT EXISTS idx_focus_areas_profile_active
ON focus_areas(profile_id) WHERE active = true;

COMMENT ON TABLE focus_areas IS 'User-defined focus area weights (replaces simple goal_mode). Enables multi-goal prioritization with custom percentages.';
COMMENT ON COLUMN focus_areas.weight_loss_pct IS 'Focus on fat loss (0-100%)';
COMMENT ON COLUMN focus_areas.muscle_gain_pct IS 'Focus on muscle growth (0-100%)';
COMMENT ON COLUMN focus_areas.strength_pct IS 'Focus on strength gains (0-100%)';
COMMENT ON COLUMN focus_areas.endurance_pct IS 'Focus on aerobic capacity (0-100%)';
COMMENT ON COLUMN focus_areas.flexibility_pct IS 'Focus on mobility/flexibility (0-100%)';
COMMENT ON COLUMN focus_areas.health_pct IS 'Focus on general health (0-100%)';

-- ============================================================================
-- Migrate existing goal_mode to focus_areas
-- ============================================================================

-- For each profile with a goal_mode, create initial focus_areas
INSERT INTO focus_areas (
    profile_id,
    weight_loss_pct, muscle_gain_pct, strength_pct,
    endurance_pct, flexibility_pct, health_pct
)
SELECT
    id AS profile_id,
    CASE goal_mode
        WHEN 'weight_loss' THEN 60
        WHEN 'recomposition' THEN 30
        WHEN 'health' THEN 5
        ELSE 0
    END AS weight_loss_pct,

    CASE goal_mode
        WHEN 'strength' THEN 40 ELSE 0
    END +
    CASE goal_mode
        WHEN 'recomposition' THEN 30 ELSE 0
    END AS muscle_gain_pct,

    CASE goal_mode
        WHEN 'strength' THEN 50
        WHEN 'recomposition' THEN 25
        WHEN 'weight_loss' THEN 10
        WHEN 'health' THEN 10
        ELSE 0
    END AS strength_pct,

    CASE goal_mode
        WHEN 'endurance' THEN 70
        WHEN 'recomposition' THEN 10
        WHEN 'weight_loss' THEN 20
        WHEN 'health' THEN 20
        ELSE 0
    END AS endurance_pct,

    CASE goal_mode
        WHEN 'endurance' THEN 10 ELSE 0
    END +
    CASE goal_mode
        WHEN 'health' THEN 15 ELSE 0
    END +
    CASE goal_mode
        WHEN 'recomposition' THEN 5 ELSE 0
    END +
    CASE goal_mode
        WHEN 'weight_loss' THEN 5 ELSE 0
    END AS flexibility_pct,

    CASE goal_mode
        WHEN 'health' THEN 50
        WHEN 'endurance' THEN 20
        WHEN 'strength' THEN 10
        WHEN 'weight_loss' THEN 5
        ELSE 0
    END AS health_pct
FROM profiles
WHERE goal_mode IS NOT NULL
ON CONFLICT DO NOTHING;

-- For profiles without goal_mode, use balanced health focus
INSERT INTO focus_areas (
    profile_id,
    weight_loss_pct, muscle_gain_pct, strength_pct,
    endurance_pct, flexibility_pct, health_pct
)
SELECT
    id AS profile_id,
    0, 0, 10, 20, 15, 55
FROM profiles
WHERE goal_mode IS NULL
  AND id NOT IN (SELECT profile_id FROM focus_areas WHERE active = true)
ON CONFLICT DO NOTHING;