-- Server-authoritative movement: hero movement state + roads graph.

-- Hero movement columns.
ALTER TABLE heroes ADD COLUMN IF NOT EXISTS destination_town_id BIGINT REFERENCES towns(id);
ALTER TABLE heroes ADD COLUMN IF NOT EXISTS current_town_id BIGINT REFERENCES towns(id);
ALTER TABLE heroes ADD COLUMN IF NOT EXISTS move_state TEXT NOT NULL DEFAULT 'walking';
-- move_state: 'walking', 'resting', 'in_town', 'fighting', 'dead'

-- Roads connect towns in a linear chain.
CREATE TABLE IF NOT EXISTS roads (
    id            BIGSERIAL PRIMARY KEY,
    from_town_id  BIGINT NOT NULL REFERENCES towns(id),
    to_town_id    BIGINT NOT NULL REFERENCES towns(id),
    distance      DOUBLE PRECISION NOT NULL,
    UNIQUE(from_town_id, to_town_id)
);

-- Pre-computed waypoints along each road.
CREATE TABLE IF NOT EXISTS road_waypoints (
    id       BIGSERIAL PRIMARY KEY,
    road_id  BIGINT NOT NULL REFERENCES roads(id) ON DELETE CASCADE,
    seq      INT NOT NULL,
    x        DOUBLE PRECISION NOT NULL,
    y        DOUBLE PRECISION NOT NULL,
    UNIQUE(road_id, seq)
);

-- Seed roads between the 7 towns in order.
-- Town positions (from 000006_quest_system.sql):
--   Willowdale  (50, 15)   id=1
--   Thornwatch  (200, 60)  id=2
--   Ashengard   (400, 120) id=3
--   Redcliff    (650, 195) id=4
--   Boghollow   (900, 270) id=5
--   Cinderkeep  (1200, 360) id=6
--   Starfall    (1550, 465) id=7

-- Forward roads (1->2, 2->3, ... 6->7).
INSERT INTO roads (from_town_id, to_town_id, distance) VALUES
    (1, 2, 156.0),
    (2, 3, 210.0),
    (3, 4, 260.0),
    (4, 5, 260.0),
    (5, 6, 312.0),
    (6, 7, 365.0)
ON CONFLICT DO NOTHING;

-- Reverse roads (2->1, 3->2, ... 7->6).
INSERT INTO roads (from_town_id, to_town_id, distance) VALUES
    (2, 1, 156.0),
    (3, 2, 210.0),
    (4, 3, 260.0),
    (5, 4, 260.0),
    (6, 5, 312.0),
    (7, 6, 365.0)
ON CONFLICT DO NOTHING;

-- Waypoints are generated at application startup via the RoadGraph loader
-- using interpolation between town positions with jitter. This avoids
-- storing thousands of rows and keeps generation deterministic per road seed.