-- LegacyWorlds Beta 6
-- PostgreSQL database scripts
--
-- Planet views and management functions
--
-- Copyright(C) 2004-2010, DeepClone Development
-- --------------------------------------------------------


-- Planet access
CREATE TYPE planet_access_type
	AS ENUM( 'BASIC' , 'PRESENT' , 'OWNER' );


-- Basic planet view
CREATE TYPE planet_basic_data AS (
	access			planet_access_type ,
	x				INT ,
	y				INT ,
	orbit			INT ,
	picture			INT ,
	name			TEXT ,
	tag				TEXT
);


-- Planet orbital view
CREATE TYPE planet_orbital_data AS (
	population		BIGINT ,
	defence			BIGINT ,
	own_power		BIGINT ,
	friendly_power	BIGINT ,
	hostile_power	BIGINT ,
	battle_id		BIGINT
);


-- Planet owner view
CREATE TYPE planet_owner_data AS (
	happiness		INT ,
	h_change		INT ,
	income			BIGINT ,
	upkeep			BIGINT ,
	can_rename		BOOLEAN ,
	can_abandon		BOOLEAN ,
	abandon_time	INT
);


-- Buildings view
CREATE TYPE planet_building_data AS (
	id				INT ,
	name			TEXT ,
	description		TEXT ,
	amount			INT ,
	jobs			INT ,
	upkeep			BIGINT ,
	p_type			building_output_type ,
	p_value			BIGINT
);


-- Build queue items
CREATE TYPE queue_item_data AS (
	name			TEXT ,
	description		TEXT ,
	amount			INT ,
	destroy			BOOLEAN ,
	investment		BIGINT ,
	time_left		BIGINT
);


-- Type for buildings available on a planet
CREATE TYPE buildable_building_data AS (
	id				INT ,
	name			TEXT ,
	description		TEXT ,
	cost			INT ,
	time_to_build	BIGINT ,
	upkeep			INT ,
	workers			INT ,
	p_type			building_output_type ,
	p_value			INT
);


-- Type for ships available on a planet
CREATE TYPE buildable_ship_data AS (
	id				INT ,
	name			TEXT ,
	description		TEXT ,
	cost			INT ,
	time_to_build	BIGINT ,
	upkeep			INT ,
	flight_time		INT ,
	power			INT
);



--
-- Determines an empire's access on a planet
--
-- Parameters:
--	e_id		Empire identifier
--	p_id		Planet identifier
--
-- Returns:
--	a basic planet view entry
--

CREATE OR REPLACE FUNCTION verse.get_planet_basics( e_id INT , p_id INT )
		RETURNS planet_basic_data
		STRICT STABLE
		SECURITY DEFINER
	AS $$
DECLARE
	o_id	INT;
	n_flt	BIGINT;
	rv		planet_basic_data;
BEGIN
	PERFORM name_id FROM verse.planets WHERE name_id = p_id;
	IF NOT FOUND THEN
		RETURN NULL;
	END IF;

	SELECT INTO o_id ep.empire_id
		FROM emp.planets ep
		WHERE ep.planet_id = p_id;
	
	SELECT INTO n_flt count( f.* )
		FROM fleets.fleets f
			LEFT OUTER JOIN fleets.movements fm
				ON fm.fleet_id = f.id
		WHERE f.location_id = p_id AND f.owner_id = e_id AND fm.fleet_id IS NULL;

	IF NOT FOUND THEN
		RETURN NULL;
	ELSEIF o_id = e_id THEN
		rv.access := 'OWNER';
	ELSEIF n_flt > 0 THEN
		rv.access := 'PRESENT';
	ELSE
		rv.access := 'BASIC';
	END IF;
	
	SELECT INTO rv.x , rv.y , rv.orbit , rv.name , rv.tag , rv.picture
			x , y , orbit , name , tag , picture
		FROM verse.map_view
		WHERE id = p_id;
	RETURN rv;
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.get_planet_basics( INT , INT ) TO :dbuser;



--
-- Gets a planet's orbital view from an empire's point of view
--
-- Parameters:
--	e_id		Empire identifier
--	p_id		Planet identifier
--
-- Returns:
--	an orbital planet view entry
--

CREATE OR REPLACE FUNCTION verse.get_orbital_view( e_id INT , p_id INT )
		RETURNS planet_orbital_data
		STRICT STABLE
		SECURITY DEFINER
	AS $$
DECLARE
	rv		planet_orbital_data;
	happ	REAL;
	e_att	BOOLEAN;
	rec		RECORD;
BEGIN
	-- Get the planet's population and defence
	SELECT INTO rv.population , happ
			floor( p.population )::BIGINT , ( ph.current / p.population )::REAL
		FROM verse.planets p
			INNER JOIN verse.planet_happiness ph ON ph.planet_id = p.name_id
		WHERE p.name_id = p_id;
	rv.defence := round( verse.adjust_production( verse.get_raw_production( p_id , 'DEF' ) , happ ) );

	-- Get the empire's fleet mode
	SELECT INTO e_att f.attacking
		FROM fleets.fleets f
			LEFT OUTER JOIN fleets.movements fm
				ON fm.fleet_id = f.id
		WHERE fm.fleet_id IS NULL AND f.owner_id = p_id AND f.location_id = p_id
		LIMIT 1;
	IF NOT FOUND THEN
		e_att := FALSE;
	END IF;

	-- Get fleet powers
	FOR rec IN SELECT (CASE
						WHEN f.owner_id = e_id THEN 'O'
						WHEN f.attacking = e_att THEN 'F'
						ELSE 'H'
					END) AS f_type , sum( fs.amount * fsd.power ) AS power
				FROM fleets.fleets f
					LEFT OUTER JOIN fleets.movements m ON m.fleet_id = f.id
					INNER JOIN fleets.ships fs ON fs.fleet_id = f.id
					INNER JOIN tech.ships fsd ON fsd.buildable_id = fs.ship_id
				WHERE f.location_id = p_id AND m.fleet_id IS NULL
				GROUP BY f.attacking , ( f.owner_id = e_id )
	LOOP
		IF rec.f_type = 'O' THEN
			rv.own_power = rec.power;
		ELSEIF rec.f_type = 'F' THEN
			rv.friendly_power = rec.power;
		ELSE
			rv.hostile_power = rec.power;
		END IF;
	END LOOP;
	
	-- Battle ID
	SELECT INTO rv.battle_id id FROM battles.battles
		WHERE location_id = p_id AND last_tick IS NULL;
	
	RETURN rv;
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.get_orbital_view( INT , INT ) TO :dbuser;



--
-- Gets a planet's view from its owner's point of view
--
-- Parameters:
--	e_id		Empire identifier
--	p_id		Planet identifier
--
-- Returns:
--	an owner planet view entry
--

CREATE OR REPLACE FUNCTION verse.get_owner_view( e_id INT , p_id INT )
		RETURNS planet_owner_data
		STRICT STABLE
		SECURITY DEFINER
	AS $$
DECLARE
	rv		planet_owner_data;
	t_happ	INT;
	h_chg	INT;
	mdelay	BIGINT;
	r_time	INTERVAL;
BEGIN
	-- Get income, upkeep, current and target happiness
	SELECT INTO rv.income , rv.upkeep , rv.happiness , t_happ
			floor( pm.income )::INT , floor( pm.upkeep )::INT ,
			floor( 100 * ph.current / p.population )::INT ,
			floor( 100 * ph.target )::INT
		FROM verse.planets p
			INNER JOIN verse.planet_happiness ph ON ph.planet_id = p.name_id
			INNER JOIN verse.planet_money pm ON pm.planet_id = p.name_id
		WHERE p.name_id = p_id;

	-- Compute happiness change indicator
	h_chg := t_happ - rv.happiness;
	IF h_chg = 0 THEN
		rv.h_change := 0;
	ELSE
		rv.h_change := ( CASE WHEN abs( h_chg ) > 10 THEN 2 ELSE 1 END );
		IF h_chg < 0 THEN
			rv.h_change := -rv.h_change;
		END IF;
	END IF;
	
	-- Check whether the planet can be renamed
	mdelay := floor( sys.get_constant( 'map.names.minDelay' ) * sys.get_constant( 'map.names.minDelay.units' ) )::BIGINT;
	r_time := ( mdelay::BIGINT || 's' )::INTERVAL;
	SELECT INTO rv.can_rename
			( cmn.name_id IS NULL )
		FROM naming.map_names n
			LEFT OUTER JOIN naming.changed_map_names cmn
				ON cmn.name_id = n.id AND cmn.named_at > now() - r_time
		WHERE n.id = p_id;

	-- Get abandon time
	SELECT INTO rv.abandon_time time_left
		FROM emp.abandon
		WHERE planet_id = p_id;
	IF FOUND THEN
		rv.can_abandon := FALSE;
	ELSE
		-- Check whether the planet can be abandoned
		SELECT INTO rv.can_abandon
				( COUNT(ep.*) > 1 )
			FROM emp.planets ep
				LEFT OUTER JOIN emp.abandon a
					ON a.planet_id = ep.planet_id
			WHERE ep.empire_id = e_id AND a.planet_id IS NULL;
	END IF;

	RETURN rv;
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.get_owner_view( INT , INT ) TO :dbuser;



--
-- Get a planet's buildings list using an empire's language settings
--
-- Parameters:
--	e_id		Empire identifier
--	p_id		Planet identifier
--
-- Returns:
--	a set of buildings data entries
--

CREATE OR REPLACE FUNCTION verse.get_buildings_view( e_id INT , p_id INT )
	RETURNS SETOF planet_building_data
	STRICT STABLE
	SECURITY DEFINER
AS $$
	SELECT b.building_id AS id ,
				t1.translated_string AS name , t2.translated_string AS description ,
				b.amount AS amount ,
				( bd.workers * b.amount )::INT AS jobs ,
				( bd.upkeep * b.amount  )::BIGINT AS upkeep ,
				bd.output_type AS p_type ,
				floor( verse.adjust_production( ( bd.output * b.amount )::REAL ,
						( ph.current / p.population )::REAL )
				)::BIGINT AS p_value
		FROM verse.planet_buildings b
			INNER JOIN verse.planets p ON p.name_id = b.planet_id
			INNER JOIN verse.planet_happiness ph ON ph.planet_id = b.planet_id
			INNER JOIN tech.buildings_view bd ON bd.name_id = b.building_id
			INNER JOIN naming.empire_names en ON en.id = $1
			INNER JOIN users.credentials c ON c.address_id = en.owner_id
			INNER JOIN defs.translations t1 ON t1.string_id = bd.name_id AND t1.lang_id = c.language_id
			INNER JOIN defs.translations t2 ON t2.string_id = bd.description_id AND t2.lang_id = c.language_id
		WHERE b.planet_id = $2 AND b.amount > 0
		ORDER BY t1.translated_string;
$$ LANGUAGE SQL;

GRANT EXECUTE ON FUNCTION verse.get_buildings_view( INT , INT ) TO :dbuser;



--
-- Get a planet's construction queue
--
-- Parameters:
--	p_id		Planet identifier
--
-- Returns:
--	the queue's items
--

CREATE OR REPLACE FUNCTION verse.get_build_queue( p_id INT )
	RETURNS SETOF queue_item_data
	STRICT STABLE
	SECURITY DEFINER
AS $$
	SELECT t1.translated_string AS name , t2.translated_string AS description ,
			qi.amount AS amount , qi.destroy AS destroy ,
			( CASE
				WHEN qi.destroy THEN 0
				ELSE floor( qi.amount * bd.cost - ( CASE WHEN qi.queue_order = 0 THEN q.money ELSE 0 END ) )
			END )::BIGINT AS investment ,
			( CASE
				WHEN ceil( verse.adjust_production( ( p.population * sys.get_constant( 'game.work.wuPerPopUnit' ) )::REAL , ( ph.current / p.population )::REAL ) ) = 0 THEN NULL
				ELSE ceil( ( qi.amount * bd.work * ( CASE WHEN qi.destroy THEN sys.get_constant( 'game.work.destructionWork' ) ELSE 1 END ) - ( CASE WHEN qi.queue_order = 0 THEN q.work ELSE 0 END ) )
							/ verse.adjust_production( ( p.population * sys.get_constant( 'game.work.wuPerPopUnit' ) )::REAL , ( ph.current / p.population )::REAL ) )
			END )::BIGINT AS time_left
		FROM verse.planets p
			INNER JOIN verse.planet_happiness ph ON ph.planet_id = p.name_id
			INNER JOIN verse.bld_queues q ON q.planet_id = p.name_id
			INNER JOIN verse.bld_items qi ON qi.queue_id = q.planet_id
			INNER JOIN tech.buildables bd ON bd.name_id = qi.building_id
			INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
			INNER JOIN naming.empire_names en ON en.id = ep.empire_id
			INNER JOIN users.credentials c ON c.address_id = en.owner_id
			INNER JOIN defs.translations t1 ON t1.string_id = bd.name_id AND t1.lang_id = c.language_id
			INNER JOIN defs.translations t2 ON t2.string_id = bd.description_id AND t2.lang_id = c.language_id
		WHERE p.name_id = $1
		ORDER BY qi.queue_order;
$$ LANGUAGE SQL;

GRANT EXECUTE ON FUNCTION verse.get_build_queue( INT ) TO :dbuser;



--
-- Get a planet's military queue
--
-- Parameters:
--	p_id		Planet identifier
--
-- Returns:
--	the queue's items
--

CREATE OR REPLACE FUNCTION verse.get_military_queue( p_id INT )
	RETURNS SETOF queue_item_data
	STRICT STABLE
	SECURITY DEFINER
AS $$
	SELECT t1.translated_string AS name , t2.translated_string AS description ,
			qi.amount AS amount , FALSE AS destroy ,
			floor( qi.amount * bd.cost - ( CASE WHEN qi.queue_order = 0 THEN q.money ELSE 0 END ) )::BIGINT AS investment ,
			( CASE
				WHEN ceil( verse.adjust_production( verse.get_raw_production( $1 , 'WORK' ) , ( ph.current / p.population )::REAL ) ) = 0 THEN NULL
				ELSE ceil( ( qi.amount * bd.work - ( CASE WHEN qi.queue_order = 0 THEN q.work ELSE 0 END ) )
							/ verse.adjust_production( verse.get_raw_production( $1 , 'WORK' ) , ( ph.current / p.population )::REAL ) )
			END )::BIGINT AS time_left
		FROM verse.planets p
			INNER JOIN verse.planet_happiness ph ON ph.planet_id = p.name_id
			INNER JOIN verse.mil_queues q ON q.planet_id = p.name_id
			INNER JOIN verse.mil_items qi ON qi.queue_id = q.planet_id
			INNER JOIN tech.buildables bd ON bd.name_id = qi.ship_id
			INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
			INNER JOIN naming.empire_names en ON en.id = ep.empire_id
			INNER JOIN users.credentials c ON c.address_id = en.owner_id
			INNER JOIN defs.translations t1 ON t1.string_id = bd.name_id AND t1.lang_id = c.language_id
			INNER JOIN defs.translations t2 ON t2.string_id = bd.description_id AND t2.lang_id = c.language_id
		WHERE p.name_id = $1
		ORDER BY qi.queue_order;
$$ LANGUAGE SQL;

GRANT EXECUTE ON FUNCTION verse.get_military_queue( INT ) TO :dbuser;



--
-- Get the list of which buildings an empire can build on a planet
--
-- Parameters:
--	p_id		Planet identifier
--
-- Returns:
--	the list of buildings
--

CREATE OR REPLACE FUNCTION verse.get_available_buildings( p_id INT )
	RETURNS SETOF buildable_building_data
	STRICT STABLE
	SECURITY DEFINER
AS $$
	SELECT bv.name_id AS id , t1.translated_string AS name , t2.translated_string AS description ,
			bv.cost AS cost ,
			( CASE
			    WHEN ceil( pdat.p_work ) = 0 THEN NULL
			    ELSE ceil( bv.work / pdat.p_work )
			END )::BIGINT AS time_to_build ,
			bv.upkeep AS upkeep , bv.workers AS workers , bv.output_type AS p_type , bv.output AS p_value
	    FROM (
			SELECT bv.*
			    FROM tech.buildings_view bv
					INNER JOIN tech.basic_buildables bb USING( name_id )
			UNION SELECT bv.*
			    FROM tech.buildings_view bv
					INNER JOIN tech.buildable_requirements r ON r.buildable_id = bv.name_id
					INNER JOIN tech.levels l ON l.id = r.level_id
					INNER JOIN emp.planets ep ON ep.planet_id = $1
					INNER JOIN emp.technologies t
					    ON t.empire_id = ep.empire_id AND t.line_id = l.line_id AND t.level > l.level
		    ) AS bv , (
			SELECT verse.adjust_production( ( p.population * sys.get_constant( 'game.work.wuPerPopUnit' ) )::REAL , ( ph.current / p.population )::REAL ) AS p_work ,
				c.language_id AS language
			    FROM verse.planets p
					INNER JOIN verse.planet_happiness ph ON ph.planet_id = p.name_id
					INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
					INNER JOIN naming.empire_names en ON en.id = ep.empire_id
					INNER JOIN users.credentials c ON c.address_id = en.owner_id
			    WHERE p.name_id = $1
		    ) AS pdat ,
		    defs.translations t1 , defs.translations t2
		WHERE t1.lang_id = pdat.language AND t1.string_id = bv.name_id AND t2.lang_id = pdat.language AND t2.string_id = bv.description_id
		ORDER BY t1.translated_string;
$$ LANGUAGE SQL;

GRANT EXECUTE ON FUNCTION verse.get_available_buildings( INT ) TO :dbuser;



--
-- Get the list of which ships an empire can build on a planet
--
-- Parameters:
--	p_id		Planet identifier
--
-- Returns:
--	the list of ships
--

CREATE OR REPLACE FUNCTION verse.get_available_ships( p_id INT )
	RETURNS SETOF buildable_ship_data
	STRICT STABLE
	SECURITY DEFINER
AS $$
	SELECT bv.name_id AS id , t1.translated_string AS name , t2.translated_string AS description ,
			bv.cost AS cost ,
			( CASE
			    WHEN ceil( pdat.p_work ) = 0 THEN NULL
			    ELSE ceil( bv.work / pdat.p_work )
			END )::BIGINT AS time_to_build ,
			bv.upkeep AS upkeep , bv.flight_time * 2 AS flight_time , bv.power AS power
	    FROM (
			SELECT bv.*
			    FROM tech.ships_view bv
					INNER JOIN tech.basic_buildables bb USING( name_id )
			UNION SELECT bv.*
			    FROM tech.ships_view bv
					INNER JOIN tech.buildable_requirements r ON r.buildable_id = bv.name_id
					INNER JOIN tech.levels l ON l.id = r.level_id
					INNER JOIN emp.planets ep ON ep.planet_id = $1
					INNER JOIN emp.technologies t
					    ON t.empire_id = ep.empire_id AND t.line_id = l.line_id AND t.level > l.level
		    ) AS bv , (
			SELECT verse.adjust_production( verse.get_raw_production( $1 , 'WORK' ) , ( ph.current / p.population )::REAL ) AS p_work ,
				c.language_id AS language
			    FROM verse.planets p
					INNER JOIN verse.planet_happiness ph ON ph.planet_id = p.name_id
					INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
					INNER JOIN naming.empire_names en ON en.id = ep.empire_id
					INNER JOIN users.credentials c ON c.address_id = en.owner_id
			    WHERE p.name_id = $1
		    ) AS pdat ,
		    defs.translations t1 , defs.translations t2
		WHERE t1.lang_id = pdat.language AND t1.string_id = bv.name_id AND t2.lang_id = pdat.language AND t2.string_id = bv.description_id
		ORDER BY t1.translated_string;
$$ LANGUAGE SQL;

GRANT EXECUTE ON FUNCTION verse.get_available_ships( INT ) TO :dbuser;



--
-- Rename a planet
--
-- Parameters:
--	p_id		Planet identifier
--	nnm			New name
--
-- Returns:
--	err_code	Error code:
--					0	Success
--					1	Banned name
--					2	Unavailable name
--					3	Too early
--

CREATE OR REPLACE FUNCTION verse.rename_planet( p_id INT , nnm TEXT , OUT err_code INT )
		STRICT VOLATILE
		SECURITY DEFINER
	AS $$
DECLARE
	c_id	INT;
	mdelay	BIGINT;
BEGIN
	SELECT INTO c_id n.owner_id
		FROM emp.planets ep
			INNER JOIN naming.empire_names n ON n.id = ep.empire_id
		WHERE ep.planet_id = p_id;
	mdelay := floor( sys.get_constant( 'map.names.minDelay' ) * sys.get_constant( 'map.names.minDelay.units' ) )::BIGINT;
	err_code := naming.change_map_name( p_id , c_id , nnm , ( mdelay || 's' )::INTERVAL );

	IF err_code = 0 THEN
		PERFORM battles.rename_planet( p_id , nnm );
	END IF;
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.rename_planet( INT , TEXT ) TO :dbuser;



--
-- Flush a planet's civilian construction queue
--
-- Parameters:
--	p_id		Planet identifier
--

CREATE OR REPLACE FUNCTION verse.flush_build_queue( p_id INT )
		RETURNS VOID
		STRICT VOLATILE
		SECURITY DEFINER
	AS $$
DECLARE
	e_id	INT;
	q_cash	REAL;
BEGIN
	SELECT INTO e_id , q_cash e.name_id , q.money
		FROM verse.planets p
			INNER JOIN verse.bld_queues q ON q.planet_id = p.name_id
			INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
			INNER JOIN emp.empires e ON e.name_id = ep.empire_id
		WHERE p.name_id = p_id
		FOR UPDATE;
	IF NOT FOUND THEN
		RETURN;
	END IF;

	DELETE FROM verse.bld_items WHERE queue_id = p_id;
	UPDATE verse.bld_queues SET money = 0 , work = 0 WHERE planet_id = p_id;
	UPDATE emp.empires
		SET cash = cash + q_cash * sys.get_constant('game.work.cancelRecovery')
		WHERE name_id = e_id;
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.flush_build_queue( INT ) TO :dbuser;



--
-- Flush a planet's military construction queue
--
-- Parameters:
--	p_id		Planet identifier
--

CREATE OR REPLACE FUNCTION verse.flush_military_queue( p_id INT )
		RETURNS VOID
		STRICT VOLATILE
		SECURITY DEFINER
	AS $$
DECLARE
	e_id	INT;
	q_cash	REAL;
BEGIN
	SELECT INTO e_id , q_cash e.name_id , q.money
		FROM verse.planets p
			INNER JOIN verse.mil_queues q ON q.planet_id = p.name_id
			INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
			INNER JOIN emp.empires e ON e.name_id = ep.empire_id
		WHERE p.name_id = p_id
		FOR UPDATE;
	IF NOT FOUND THEN
		RETURN;
	END IF;

	DELETE FROM verse.mil_items WHERE queue_id = p_id;
	UPDATE verse.mil_queues SET money = 0 , work = 0 WHERE planet_id = p_id;
	UPDATE emp.empires
		SET cash = cash + q_cash * sys.get_constant('game.work.cancelRecovery')
		WHERE name_id = e_id;
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.flush_military_queue( INT ) TO :dbuser;



--
-- Adds an item to a planet's military queue
--
-- Parameters:
--	p_id		Planet identifier
--	s_id		Ship type identifier
--	s_cnt		Amount of ships to build
--

CREATE OR REPLACE FUNCTION verse.add_military_item( p_id INT , s_id INT , s_cnt INT )
		RETURNS VOID
		STRICT VOLATILE
		SECURITY DEFINER
	AS $$
DECLARE
	e_id		INT;
	qlen		INT;
	dep_level	INT;
	has_level	INT;
BEGIN
	IF s_cnt < 1 THEN
		RETURN;
	END IF;

	-- Lock empire and planet
	SELECT INTO e_id e.name_id
		FROM verse.planets p
			INNER JOIN verse.mil_queues q ON q.planet_id = p.name_id
			INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
			INNER JOIN emp.empires e ON e.name_id = ep.empire_id
		WHERE p.name_id = p_id
		FOR UPDATE OF p , q , ep , e;
	IF NOT FOUND THEN
		RETURN;
	END IF;

	-- Check technologies
	SELECT INTO dep_level , has_level l.level , t.level
		FROM tech.ships s
			LEFT OUTER JOIN tech.buildable_requirements r
				ON r.buildable_id = s.buildable_id
			LEFT OUTER JOIN tech.levels l
				ON l.id = r.level_id
			LEFT OUTER JOIN emp.technologies t
				ON t.empire_id = e_id AND t.line_id = l.line_id AND t.level > l.level
		WHERE s.buildable_id = s_id;
	IF NOT FOUND OR ( has_level IS NULL AND dep_level IS NOT NULL ) THEN
		RETURN;
	END IF;

	-- Check queue length
	SELECT INTO qlen count( * ) FROM verse.mil_items WHERE queue_id = p_id;
	IF qlen >= 5 THEN
		RETURN;
	END IF;
	
	-- Insert queue item
	INSERT INTO verse.mil_items ( queue_id , queue_order , ship_id , amount )
		VALUES ( p_id , qlen , s_id , s_cnt );
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.add_military_item( INT , INT , INT ) TO :dbuser;



--
-- Adds building constructions to a planet's civilian queue
--
-- Parameters:
--	p_id		Planet identifier
--	b_id		Building type identifier
--	b_cnt		Amount of ships to build
--

CREATE OR REPLACE FUNCTION verse.construct_buildings( p_id INT , b_id INT , b_cnt INT )
		RETURNS VOID
		STRICT VOLATILE
		SECURITY DEFINER
	AS $$
DECLARE
	e_id		INT;
	qlen		INT;
	dep_level	INT;
	has_level	INT;
BEGIN
	IF b_cnt < 1 THEN
		RETURN;
	END IF;

	-- Lock empire and planet
	SELECT INTO e_id e.name_id
		FROM verse.planets p
			INNER JOIN verse.bld_queues q ON q.planet_id = p.name_id
			INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
			INNER JOIN emp.empires e ON e.name_id = ep.empire_id
		WHERE p.name_id = p_id
		FOR UPDATE OF p , q , ep , e;
	IF NOT FOUND THEN
		RETURN;
	END IF;

	-- Check technologies
	SELECT INTO dep_level , has_level l.level , t.level
		FROM tech.buildings b
			LEFT OUTER JOIN tech.buildable_requirements r
				ON r.buildable_id = b.buildable_id
			LEFT OUTER JOIN tech.levels l
				ON l.id = r.level_id
			LEFT OUTER JOIN emp.technologies t
				ON t.empire_id = e_id AND t.line_id = l.line_id AND t.level > l.level
		WHERE b.buildable_id = b_id;
	IF NOT FOUND OR ( has_level IS NULL AND dep_level IS NOT NULL ) THEN
		RETURN;
	END IF;

	-- Check queue length
	SELECT INTO qlen count( * ) FROM verse.bld_items WHERE queue_id = p_id;
	IF qlen >= 5 THEN
		RETURN;
	END IF;
	
	-- Insert queue item
	INSERT INTO verse.bld_items ( queue_id , queue_order , building_id , amount , destroy )
		VALUES ( p_id , qlen , b_id , b_cnt , FALSE );
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.construct_buildings( INT , INT , INT ) TO :dbuser;



--
-- Adds building destructions to a planet's civilian queue
--
-- Parameters:
--	p_id		Planet identifier
--	b_id		Building type identifier
--	b_cnt		Amount of ships to build
--
-- Returns:
--	success		Whether the orders could be added to the queue
--					(only failures related to the amount of buildings are reported)
--

CREATE OR REPLACE FUNCTION verse.destroy_buildings( p_id INT , b_id INT , b_cnt INT , OUT success BOOLEAN )
		STRICT VOLATILE
		SECURITY DEFINER
	AS $$
DECLARE
	e_id		INT;
	qlen		INT;
	built		INT;
	in_queue	INT;
BEGIN
	IF b_cnt < 1 THEN
		RETURN;
	END IF;

	-- Lock empire and planet
	SELECT INTO e_id e.name_id
		FROM verse.planets p
			INNER JOIN verse.bld_queues q ON q.planet_id = p.name_id
			INNER JOIN verse.planet_buildings b ON b.planet_id = p.name_id
			INNER JOIN emp.planets ep ON ep.planet_id = p.name_id
			INNER JOIN emp.empires e ON e.name_id = ep.empire_id
		WHERE p.name_id = p_id
		FOR UPDATE OF p , q , ep , e , b;
	IF NOT FOUND THEN
		success := TRUE;
		RETURN;
	END IF;

	-- Check queue length
	SELECT INTO qlen count( * ) FROM verse.bld_items WHERE queue_id = p_id;
	IF qlen >= 5 THEN
		success := TRUE;
		RETURN;
	END IF;

	-- Check existing buildings and build queue contents
	SELECT INTO built amount
		FROM verse.planet_buildings
		WHERE planet_id = p_id AND building_id = b_id;
	IF NOT FOUND THEN
		built := 0;
	END IF;
	SELECT INTO in_queue sum( amount * ( CASE WHEN destroy THEN -1 ELSE 1 END ) )
		FROM verse.bld_items
		WHERE queue_id = p_id AND building_id = b_id;
	IF in_queue IS NULL THEN
		in_queue := 0;
	END IF;

	success := ( b_cnt <= in_queue + built );
	IF NOT success THEN
		success := FALSE;
		RETURN;
	END IF;
	
	-- Insert queue item
	INSERT INTO verse.bld_items ( queue_id , queue_order , building_id , amount , destroy )
		VALUES ( p_id , qlen , b_id , b_cnt , TRUE );
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.destroy_buildings( INT , INT , INT ) TO :dbuser;



--
-- Start abandoning a planet
--
-- Parameters:
--	p_id		Planet to abandon
--
-- Returns:
--	tta			Time to abandon
--

CREATE OR REPLACE FUNCTION verse.abandon( p_id INT , OUT tta INT )
		STRICT VOLATILE
		SECURITY DEFINER
	AS $$
BEGIN
	PERFORM ep.planet_id
		FROM emp.planets ep
			INNER JOIN emp.empires e ON e.name_id = ep.empire_id
			INNER JOIN verse.planets p ON p.name_id = ep.planet_id
			INNER JOIN verse.planet_money pm ON pm.planet_id = p.name_id
		WHERE ep.planet_id = p_id
		FOR UPDATE;
	IF NOT FOUND THEN
		tta := 0;
		RETURN;
	END IF;

	tta := floor( sys.get_constant( 'game.timeToAbandon' ) );
	BEGIN
		INSERT INTO emp.abandon ( planet_id , time_left )
			VALUES ( p_id , tta );
		UPDATE verse.planet_money SET income = 0
			WHERE planet_id = p_id;
	EXCEPTION
		WHEN unique_violation THEN
			tta := 0;
	END;
END;
$$ LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION verse.abandon( INT ) TO :dbuser;



--
-- Cancels planet abandon
--
-- Parameters:
--	p_id		Planet not to abandon
--

CREATE OR REPLACE FUNCTION verse.cancel_abandon( p_id INT )
	RETURNS VOID
	STRICT VOLATILE
	SECURITY DEFINER
AS $$
	DELETE FROM emp.abandon WHERE planet_id = $1;
$$ LANGUAGE SQL;

GRANT EXECUTE ON FUNCTION verse.cancel_abandon( INT ) TO :dbuser;



--
-- Prepares a planet for abandon or ownership transfer
--
-- Parameters:
--	p_id		Planet identifier
--

CREATE OR REPLACE FUNCTION emp.leave_planet( p_id INT )
		RETURNS VOID
		STRICT VOLATILE
		SECURITY INVOKER
	AS $$
DECLARE
	bp_id	BIGINT;
BEGIN
	PERFORM verse.flush_military_queue( p_id );
	PERFORM verse.flush_build_queue( p_id );
	DELETE FROM emp.abandon WHERE planet_id = p_id;
	DELETE FROM emp.planets WHERE planet_id = p_id;

	-- Update battle records
	SELECT INTO bp_id bpo.protagonist_id
		FROM battles.battles b
			INNER JOIN battles.protagonists bp ON bp.battle_id = b.id
			INNER JOIN battles.planet_ownership bpo ON bpo.protagonist_id = bp.id
		WHERE b.location_id = p_id AND b.last_tick IS NULL;
	IF FOUND
	THEN
		UPDATE battles.planet_ownership
			SET abandoned_at = sys.get_tick() - 1
			WHERE protagonist_id = bp_id;
	END IF;
END;
$$ LANGUAGE plpgsql;



--
-- Inflicts battle damage to a planet's stationary defences
--
-- Parameters:
--	p_id		Planet identifier
--	t_power		Total defences
--	dmg			Damage to inflict
--	b_id		Battle identifier
--	tick		Current tick
--

CREATE OR REPLACE FUNCTION verse.inflict_battle_damage( p_id INT , t_power BIGINT , dmg REAL , b_id BIGINT , tick BIGINT )
		RETURNS VOID
		STRICT VOLATILE
		SECURITY INVOKER
	AS $$
DECLARE
	rec		RECORD;
	bp_id	BIGINT;
	st_dmg	REAL;
	n_dest	INT;
BEGIN
	PERFORM sys.write_log( 'BattleUpdate' , 'TRACE'::log_level , 'Inflicting ' || dmg
		|| ' damage to planet #' || p_id );

	bp_id := NULL;
	FOR rec IN SELECT b.building_id , b.amount , b.damage , ( b.amount * bd.output ) AS power ,
					bd.output AS s_power
				FROM verse.planet_buildings b
					INNER JOIN tech.buildings bd ON bd.buildable_id = b.building_id
				WHERE b.planet_id = p_id AND b.amount > 0 AND bd.output_type = 'DEF'
	LOOP
		st_dmg := rec.damage + ( dmg * rec.power / t_power ) / rec.s_power;
		n_dest := floor( st_dmg );
		st_dmg := st_dmg - n_dest;
		IF n_dest >= rec.amount THEN
			n_dest := rec.amount;
			st_dmg := 0;
		END IF;
		
		PERFORM sys.write_log( 'BattleUpdate' , 'TRACE'::log_level , 'Building type #' || rec.building_id
			|| ' - Damage ' || st_dmg || '; destruction: ' || n_dest );

		-- Apply damage
		UPDATE verse.planet_buildings
			SET damage = st_dmg , amount = amount - n_dest
			WHERE planet_id = p_id AND building_id = rec.building_id;
			
		-- Update battle record
		CONTINUE WHEN n_dest = 0;
		IF bp_id IS NULL THEN
			bp_id := battles.goc_planet( b_id , 'BATTLE'::battle_planet_change , tick );
		END IF;
		PERFORM battles.record_building_change( bp_id , rec.building_id , -n_dest );
	END LOOP;
END;
$$ LANGUAGE plpgsql;



--
-- Inflicts debt-related damage to all buildings of an empire
--
-- Parameters:
--	e_id		Empire identifer
--	t_upkeep	Total building upkeep
--	debt		Daily debt
--	d_ratio		Debt damage ratio
--

CREATE OR REPLACE FUNCTION verse.handle_debt( e_id INT , t_upkeep REAL , debt REAL , d_ratio REAL )
		RETURNS VOID
		STRICT VOLATILE
		SECURITY INVOKER
	AS $$
DECLARE
	tick		BIGINT;
	tot_damage	REAL;
	p_rec		RECORD;
	b_rec		RECORD;
	bp_id		BIGINT;
	b_damage	REAL;
	n_destroy	INT;
BEGIN
	tick := sys.get_tick( ) - 1;
	tot_damage := t_upkeep * d_ratio / debt;
	PERFORM sys.write_log( 'EmpireDebt' , 'DEBUG'::log_level , 'Inflicting debt damage to buildings; total upkeep: '
		|| t_upkeep || ', damage ratio: ' || d_ratio || ', total damage: ' || tot_damage );

	FOR p_rec IN SELECT ep.planet_id AS planet , b.id AS battle
					FROM emp.planets ep
						LEFT OUTER JOIN battles.battles b
							ON b.location_id = ep.planet_id AND b.last_tick IS NULL
					WHERE ep.empire_id = e_id
	LOOP
		bp_id := NULL;
		
		FOR b_rec IN SELECT b.building_id AS building , b.amount AS amount ,
							( b.amount * bb.upkeep )::REAL AS upkeep ,
							b.damage AS damage , ( bd.output_type = 'DEF' ) AS is_def
						FROM verse.planet_buildings b
							INNER JOIN tech.buildables bb ON bb.name_id = b.building_id
							INNER JOIN tech.buildings bd ON bd.buildable_id = b.building_id
						WHERE b.amount > 0 AND b.planet_id = p_rec.planet
		LOOP
			-- Compute damage and destruction
			b_damage := b_rec.damage + tot_damage * b_rec.upkeep / t_upkeep;
			n_destroy := floor( b_damage );
			IF n_destroy >= b_rec.amount
			THEN
				n_destroy := b_rec.amount;
				b_damage := 0;
			ELSE
				b_damage := b_damage - n_destroy;
			END IF;

			-- Update entry
			UPDATE verse.planet_buildings
				SET amount = amount - n_destroy , damage = b_damage
				WHERE building_id = b_rec.building AND planet_id = p_rec.planet;

			-- Update battle
			CONTINUE WHEN p_rec.battle IS NULL OR NOT b_rec.is_def OR n_destroy = 0;
			IF bp_id IS NULL
			THEN
				bp_id := battles.goc_planet( p_rec.battle , 'DESTROY'::battle_planet_change , tick );
			END IF;
			PERFORM battles.record_building_change( bp_id , b_rec.building , -n_destroy );
		END LOOP;
	END LOOP;
END;
$$ LANGUAGE plpgsql;