-- Migration 004: Add custom workout support
-- Allows users to create personalized workout plans based on program days

-- Custom workouts created by users
CREATE TABLE IF NOT EXISTS custom_workouts (
    id SERIAL PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    source_program_day_id INTEGER REFERENCES program_days(id) ON DELETE SET NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Exercises within a custom workout
CREATE TABLE IF NOT EXISTS custom_workout_exercises (
    id SERIAL PRIMARY KEY,
    custom_workout_id INTEGER NOT NULL REFERENCES custom_workouts(id) ON DELETE CASCADE,
    exercise_id INTEGER NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
    sets INTEGER NOT NULL DEFAULT 3,
    reps_min INTEGER NOT NULL DEFAULT 8,
    reps_max INTEGER NOT NULL DEFAULT 12,
    rpe_target DECIMAL(3,1),
    replaced_exercise_id INTEGER REFERENCES exercises(id) ON DELETE SET NULL,
    order_index INTEGER NOT NULL DEFAULT 0,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Extend workout_logs to support custom workouts
ALTER TABLE workout_logs
    ADD COLUMN IF NOT EXISTS source_type VARCHAR(20) DEFAULT 'program' CHECK (source_type IN ('program', 'custom')),
    ADD COLUMN IF NOT EXISTS custom_workout_id INTEGER REFERENCES custom_workouts(id) ON DELETE SET NULL;

-- Indexes
CREATE INDEX IF NOT EXISTS idx_custom_workouts_user ON custom_workouts(user_id);
CREATE INDEX IF NOT EXISTS idx_custom_workout_exercises_workout ON custom_workout_exercises(custom_workout_id);
CREATE INDEX IF NOT EXISTS idx_workout_logs_custom_workout ON workout_logs(custom_workout_id);