BEGIN;

CREATE SEQUENCE UNITS_ID_SEQ;

CREATE TABLE units (
    id   int PRIMARY KEY NOT NULL,
    name VARCHAR(32)     NOT NULL UNIQUE
);

-- Gewaesser
CREATE SEQUENCE RIVERS_ID_SEQ;

CREATE TABLE rivers (
    id              int PRIMARY KEY NOT NULL,
    official_number int8                     UNIQUE,
    name            VARCHAR(256)    NOT NULL UNIQUE,
    km_up           BOOLEAN         NOT NULL DEFAULT true,
    wst_unit_id int                 NOT NULL REFERENCES units(id)
);

-- Bruecke, Haefen, etc.
CREATE SEQUENCE ATTRIBUTES_ID_SEQ;

CREATE TABLE attributes (
    id    int PRIMARY KEY NOT NULL,
    value VARCHAR(256)    NOT NULL UNIQUE
);

-- segments from/to at a river
CREATE SEQUENCE RANGES_ID_SEQ;

CREATE TABLE ranges (
    id       int PRIMARY KEY NOT NULL,
    river_id int             NOT NULL REFERENCES rivers(id) ON DELETE CASCADE,
    a        NUMERIC         NOT NULL,
    b        NUMERIC,
    UNIQUE (river_id, a, b)
);

-- Lage 'links', 'rechts', etc.
CREATE SEQUENCE POSITIONS_ID_SEQ;

CREATE TABLE positions (
    id    int PRIMARY KEY NOT NULL,
    value VARCHAR(256)    NOT NULL UNIQUE
);

-- Kante 'oben', 'unten'
CREATE SEQUENCE EDGES_ID_SEQ;

CREATE TABLE edges (
    id     int PRIMARY KEY NOT NULL,
    top    NUMERIC,
    bottom NUMERIC
);

-- Types of annotatations (Hafen, Bruecke, Zufluss, ...)
CREATE SEQUENCE ANNOTATION_TYPES_ID_SEQ;

CREATE TABLE annotation_types (
    id    int PRIMARY KEY NOT NULL,
    name  VARCHAR(256)    NOT NULL UNIQUE
);

-- Some object (eg. Hafen) at a segment of river
-- plus its position.
CREATE SEQUENCE ANNOTATIONS_ID_SEQ;

CREATE TABLE annotations (
    id           int PRIMARY KEY NOT NULL,
    range_id     int             NOT NULL REFERENCES ranges(id) ON DELETE CASCADE,
    attribute_id int             NOT NULL REFERENCES attributes(id),
    position_id  int REFERENCES positions(id),
    edge_id      int REFERENCES edges(id),
    type_id      int REFERENCES annotation_types(id)
);

-- Pegel
CREATE SEQUENCE GAUGES_ID_SEQ;

CREATE TABLE gauges (
    id              int PRIMARY KEY NOT NULL,
    name            VARCHAR(256)    NOT NULL,
    river_id        int             NOT NULL REFERENCES rivers(id) ON DELETE CASCADE,
    station         NUMERIC         NOT NULL UNIQUE,
    aeo             NUMERIC         NOT NULL,
    official_number int8                     UNIQUE,

    -- Pegelnullpunkt
    datum    NUMERIC NOT NULL,
    -- Streckengueltigkeit
    range_id int REFERENCES ranges (id) ON DELETE CASCADE,

    UNIQUE (name, river_id),
    UNIQUE (river_id, station)
);

-- Type of a Hauptwert 'W', 'Q', 'D', etc.
CREATE SEQUENCE MAIN_VALUE_TYPES_ID_SEQ;

CREATE TABLE main_value_types (
    id   int PRIMARY KEY NOT NULL,
    name VARCHAR(256)    NOT NULL UNIQUE
);

--  Named type of a Hauptwert (eg. HQ100)
CREATE SEQUENCE NAMED_MAIN_VALUES_ID_SEQ;

CREATE TABLE named_main_values (
    id      int PRIMARY KEY NOT NULL,
    name    VARCHAR(256)    NOT NULL UNIQUE,
    type_id int NOT NULL REFERENCES main_value_types(id),
    UNIQUE (name, type_id)
);

-- Table for time intervals
CREATE SEQUENCE TIME_INTERVALS_ID_SEQ;

CREATE TABLE time_intervals (
    id         int PRIMARY KEY NOT NULL,
    start_time TIMESTAMP       NOT NULL,
    stop_time  TIMESTAMP,
    CHECK (start_time <= stop_time)
);

-- Stammdaten
CREATE SEQUENCE MAIN_VALUES_ID_SEQ;

CREATE TABLE main_values (
    id             int PRIMARY KEY NOT NULL,
    gauge_id       int NOT NULL REFERENCES gauges(id) ON DELETE CASCADE,
    named_value_id int NOT NULL REFERENCES named_main_values(id),
    value          NUMERIC NOT NULL,

    time_interval_id int REFERENCES time_intervals(id),

    -- TODO: better checks
    UNIQUE (gauge_id, named_value_id, time_interval_id)
);

-- Abflusstafeln
CREATE SEQUENCE DISCHARGE_TABLES_ID_SEQ;

CREATE TABLE discharge_tables (
    id               int PRIMARY KEY NOT NULL,
    gauge_id         int NOT NULL REFERENCES gauges(id) ON DELETE CASCADE,
    description      VARCHAR(256) NOT NULL,
    bfg_id           VARCHAR(50),
    kind             int NOT NULL DEFAULT 0,
    time_interval_id int REFERENCES time_intervals(id)

    -- TODO: better checks
    -- UNIQUE (gauge_id, kind, time_interval_id)
);

-- Values of the Abflusstafeln
CREATE SEQUENCE DISCHARGE_TABLE_VALUES_ID_SEQ;

CREATE TABLE discharge_table_values (
    id       int PRIMARY KEY NOT NULL,
    table_id int NOT NULL REFERENCES discharge_tables(id) ON DELETE CASCADE,
    q        NUMERIC NOT NULL,
    w        NUMERIC NOT NULL,

    UNIQUE (table_id, q, w)
);

-- WST files
CREATE SEQUENCE WSTS_ID_SEQ;

CREATE TABLE wsts (
    id          int PRIMARY KEY NOT NULL,
    river_id    int NOT NULL REFERENCES rivers(id) ON DELETE CASCADE,
    description VARCHAR(256) NOT NULL,
    kind        int NOT NULL DEFAULT 0,
    -- TODO: more meta infos
    UNIQUE (river_id, description)
);

-- columns of WST files
CREATE SEQUENCE WST_COLUMNS_ID_SEQ;

CREATE TABLE wst_columns (
    id          int PRIMARY KEY NOT NULL,
    wst_id      int NOT NULL REFERENCES wsts(id) ON DELETE CASCADE,
    name        VARCHAR(256) NOT NULL,
    description VARCHAR(256),
    position    int NOT NULL DEFAULT 0,

    time_interval_id int REFERENCES time_intervals(id),

    UNIQUE (wst_id, name),
    UNIQUE (wst_id, position)
);

-- w values in  WST file column
CREATE SEQUENCE WST_COLUMN_VALUES_ID_SEQ;

CREATE TABLE wst_column_values (
    id            int PRIMARY KEY NOT NULL,
    wst_column_id int NOT NULL REFERENCES wst_columns(id) ON DELETE CASCADE,
    position      NUMERIC NOT NULL,
    w             NUMERIC NOT NULL,

    UNIQUE (position, wst_column_id),
    UNIQUE (position, wst_column_id, w)
);

-- bind q values to range
CREATE SEQUENCE WST_Q_RANGES_ID_SEQ;

CREATE TABLE wst_q_ranges (
    id       int PRIMARY KEY NOT NULL,
    range_id int NOT NULL REFERENCES ranges(id) ON DELETE CASCADE,
    q        NUMERIC NOT NULL
);

-- bind q ranges to wst columns
CREATE SEQUENCE WST_COLUMN_Q_RANGES_ID_SEQ;

CREATE TABLE wst_column_q_ranges (
    id             int PRIMARY KEY NOT NULL,
    wst_column_id  int NOT NULL REFERENCES wst_columns(id) ON DELETE CASCADE,
    wst_q_range_id int NOT NULL REFERENCES wst_q_ranges(id) ON DELETE CASCADE,

    UNIQUE (wst_column_id, wst_q_range_id)
);

CREATE VIEW wst_value_table AS
    SELECT wcv.position AS position,
           w,
           (SELECT q
            FROM   wst_column_q_ranges wcqr
                   JOIN wst_q_ranges wqr
                     ON wcqr.wst_q_range_id = wqr.id
                   JOIN ranges r
                     ON r.id = wqr.range_id
            WHERE  wcqr.wst_column_id = wc.id
                   AND wcv.position BETWEEN r.a AND r.b) AS q,
           wc.position                                   AS column_pos,
           w.id                                          AS wst_id
    FROM   wst_column_values wcv
           JOIN wst_columns wc
             ON wcv.wst_column_id = wc.id
           JOIN wsts w
             ON wc.wst_id = w.id
    ORDER  BY wcv.position ASC,
          wc.position DESC;

-- view to select the w values of a WST
CREATE VIEW wst_w_values AS
    SELECT wcv."position" AS km, 
           wcv.w          AS w,  
           wc."position"  AS column_pos, 
           w.id           AS wst_id
        FROM wst_column_values wcv
        JOIN wst_columns wc ON wcv.wst_column_id = wc.id
        JOIN wsts w         ON wc.wst_id = w.id
    ORDER BY wcv."position", wc."position";

-- view to select the q values of a WST
CREATE VIEW wst_q_values AS
    SELECT wc.position AS column_pos,
           wqr.q       AS q, 
           r.a         AS a, 
           r.b         AS b,
           wc.wst_id   AS wst_id
    FROM wst_column_q_ranges wcqr
    JOIN wst_q_ranges wqr ON wcqr.wst_q_range_id = wqr.id
    JOIN ranges r         ON wqr.range_id        = r.id
    JOIN wst_columns wc   ON wcqr.wst_column_id  = wc.id
    ORDER BY wc.position, wcqr.wst_column_id, r.a;

-- data for the cross-sections

CREATE SEQUENCE CROSS_SECTIONS_ID_SEQ;

CREATE TABLE cross_sections (
    id               int PRIMARY KEY NOT NULL,
    river_id         int             NOT NULL REFERENCES rivers(id) ON DELETE CASCADE,
    time_interval_id int                      REFERENCES time_intervals(id),
    description      VARCHAR(256)
);

CREATE SEQUENCE CROSS_SECTION_LINES_ID_SEQ;

CREATE TABLE cross_section_lines (
    id               int PRIMARY KEY NOT NULL,
    km               NUMERIC         NOT NULL,
    cross_section_id int             NOT NULL REFERENCES cross_sections(id) ON DELETE CASCADE,
    UNIQUE (km, cross_section_id)
);

CREATE SEQUENCE CROSS_SECTION_POINTS_ID_SEQ;

CREATE TABLE cross_section_points (
    id                    int PRIMARY KEY NOT NULL,
    cross_section_line_id int             NOT NULL REFERENCES cross_section_lines(id) ON DELETE CASCADE,
    col_pos               int             NOT NULL,
    x                     NUMERIC         NOT NULL,
    y                     NUMERIC         NOT NULL,
    UNIQUE (cross_section_line_id, col_pos)
);

-- Indices for faster access of the points
CREATE INDEX cross_section_lines_km_idx
    ON cross_section_lines(km);
CREATE INDEX cross_section_points_line_idx
    ON cross_section_points(cross_section_line_id);

-- Hydraulische Kenngroessen

CREATE SEQUENCE HYKS_ID_SEQ;

CREATE TABLE hyks (
    id          int PRIMARY KEY NOT NULL,
    river_id    int             NOT NULL REFERENCES rivers(id) ON DELETE CASCADE,
    description VARCHAR(256)    NOT NULL
);

CREATE SEQUENCE HYK_ENTRIES_ID_SEQ;

CREATE TABLE hyk_entries (
    id          int PRIMARY KEY NOT NULL,
    hyk_id      int             NOT NULL REFERENCES hyks(id) ON DELETE CASCADE,
    km          NUMERIC         NOT NULL,
    measure     TIMESTAMP,
    UNIQUE (hyk_id, km)
);

CREATE SEQUENCE HYK_FORMATIONS_ID_SEQ;

CREATE TABLE hyk_formations (
    id            int PRIMARY KEY NOT NULL,
    formation_num int             NOT NULL DEFAULT 0,
    hyk_entry_id  int             NOT NULL REFERENCES hyk_entries(id) ON DELETE CASCADE,
    top           NUMERIC         NOT NULL,
    bottom        NUMERIC         NOT NULL,
    distance_vl   NUMERIC         NOT NULL,
    distance_hf   NUMERIC         NOT NULL,
    distance_vr   NUMERIC         NOT NULL,
    UNIQUE (hyk_entry_id, formation_num)
);

CREATE SEQUENCE HYK_FLOW_ZONE_TYPES_ID_SEQ;

CREATE TABLE hyk_flow_zone_types (
    id          int PRIMARY KEY NOT NULL,
    name        VARCHAR(50)     NOT NULL UNIQUE,
    description VARCHAR(256)
);

CREATE SEQUENCE HYK_FLOW_ZONES_ID_SEQ;

CREATE TABLE hyk_flow_zones (
    id           int PRIMARY KEY NOT NULL,
    formation_id int             NOT NULL REFERENCES hyk_formations(id) ON DELETE CASCADE,
    type_id      int             NOT NULL REFERENCES hyk_flow_zone_types(id),
    a            NUMERIC         NOT NULL,
    b            NUMERIC         NOT NULL,
    CHECK (a <= b)
);

CREATE VIEW official_lines
AS
  SELECT w.river_id AS river_id,
         w.id       AS wst_id,
         wc.id      AS wst_column_id,
         wc.name    AS name,
         wc.position AS wst_column_pos
  FROM   wsts w
         JOIN wst_columns wc
           ON wc.wst_id = w.id
  WHERE  w.kind = 3;

CREATE VIEW q_main_values
AS
  SELECT riv.id AS river_id,
         g.id   AS gauge_id,
         g.name AS gauge_name,
         r.a    AS a,
         r.b    AS b,
         REGEXP_REPLACE(
            nmv.name, E'[:space:]*\\(.*\\)[:space:]*', '') AS name,
         CAST(mv.value AS NUMERIC(38, 2)) AS value
  FROM   main_values mv
         JOIN named_main_values nmv
           ON mv.named_value_id = nmv.id
         JOIN main_value_types mvt
           ON nmv.type_id = mvt.id
         JOIN gauges g
           ON mv.gauge_id = g.id
         JOIN ranges r
           ON g.range_id = r.id
         JOIN rivers riv
           ON g.river_id = riv.id
  WHERE  mvt.name = 'Q'
  ORDER  BY g.id, CAST(mv.value AS NUMERIC(38,2));

CREATE VIEW official_q_values
AS
  SELECT ol.river_id AS river_id,
         wst_id,
         wst_column_id,
         gauge_id,
         gauge_name,
         a,
         b,
         ol.name,
         value,
         wst_column_pos
  FROM   official_lines ol
         JOIN q_main_values qmv
           ON ol.river_id = qmv.river_id
              AND ol.name = qmv.name;

CREATE VIEW wst_ranges
AS
  SELECT wc.id             AS wst_column_id,
         wc.wst_id         AS wst_id,
         Min(wcv.position) AS a,
         Max(wcv.position) AS b
  FROM   wst_columns wc
         JOIN wst_column_values wcv
           ON wc.id = wcv.wst_column_id
  GROUP  BY wc.id,
            wc.wst_id;

COMMIT;