from typing import Any

from ..core.database import (
    ChangeSet,
    DatabaseCommand,
    execute_command,
    g_add_prefix,
    g_delete_prefix,
    g_update_prefix,
    read_all,
    sql_literal,
    try_read,
)


def get_vertex_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'link'   : {'type': 'str'  , 'optional': False , 'readonly': True },
             'coords' : {'type': 'list' , 'optional': False , 'readonly': False, 
                           'element': { 'x'  : {'type': 'float' , 'optional': False , 'readonly': False }, 
                                        'y'  : {'type': 'float' , 'optional': False , 'readonly': False } }}}


def get_vertex(name: str, link: str) -> dict[str, Any]:
    cus = read_all(name, "select st_x(geom) as x, st_y(geom) as y from gis.link_vertices where link_id = %s order by sequence_no", (link,))
    cs = []
    for r in cus:
        cs.append({ 'x': float(r['x']), 'y': float(r['y']) })
    return { 'link': link, 'coords': cs }


def _set_vertex(name: str, cs: ChangeSet) -> DatabaseCommand:
    link = cs.operations[0]['link']

    new = { 'link': link, 'coords': [] }

    f_link = sql_literal(link)

    statement = f"delete from gis.link_vertices where link_id = {f_link};"
    for sequence_no, xy in enumerate(cs.operations[0]['coords']):
        x, y = float(xy['x']), float(xy['y'])
        f_x, f_y = sql_literal(x), sql_literal(y)
        statement += f"\ninsert into gis.link_vertices (link_id, sequence_no, geom) values ({f_link}, {sequence_no}, st_setsrid(st_makepoint({f_x}, {f_y}), 900914));"
        new['coords'].append({ 'x': x, 'y': y })

    change = { 'type': 'vertex' } | new

    return DatabaseCommand(statement, [change])


def set_vertex(name: str, cs: ChangeSet) -> ChangeSet:
    result = _set_vertex(name, cs)
    result.changes[0] |= g_update_prefix
    return execute_command(name, result)


def _add_vertex(name: str, cs: ChangeSet) -> DatabaseCommand:
    result = _set_vertex(name, cs)
    result.changes[0] |= g_add_prefix
    return result


def _delete_vertex(name: str, cs: ChangeSet) -> DatabaseCommand:
    cs.operations[0]['coords'] = []
    result = _set_vertex(name, cs)
    result.changes[0] |= g_delete_prefix
    return result


def add_vertex(name: str, cs: ChangeSet) -> ChangeSet:
    result = _add_vertex(name, cs)
    return execute_command(name, result)


def delete_vertex(name: str, cs: ChangeSet) -> ChangeSet:
    result = _delete_vertex(name, cs)
    return execute_command(name, result)


def get_all_vertex_links(name: str) -> list[str]:
    result : list[str] = []
    rows = read_all(name, 'select distinct link_id from gis.link_vertices order by link_id')
    for row in rows:
        result.append(str(row['link_id']))
    return result


def get_all_vertices(name: str) -> list[dict[str, Any]]:
    return read_all(name, 'select link_id, sequence_no, st_x(geom) as x, st_y(geom) as y from gis.link_vertices order by link_id, sequence_no')


#--------------------------------------------------------------
# [EPA2][IN][OUT]
#   id  x  y
# [EPA3][NOT SUPPORT]
#--------------------------------------------------------------


def inp_in_vertex(line: str) -> str:
    tokens = line.split()
    link = tokens[0]
    x = float(tokens[1])
    y = float(tokens[2])
    link_sql = sql_literal(link)
    return f"insert into gis.link_vertices (link_id, sequence_no, geom) values ({link_sql}, (select coalesce(max(sequence_no) + 1, 0) from gis.link_vertices where link_id = {link_sql}), st_setsrid(st_makepoint({sql_literal(x)}, {sql_literal(y)}), 900914));"


def inp_out_vertex(name: str) -> list[str]:
    lines = []
    objs = read_all(name, "select link_id, st_x(geom) as x, st_y(geom) as y from gis.link_vertices order by link_id, sequence_no")
    for obj in objs:
        link = obj['link_id']
        x = obj['x']
        y = obj['y']
        lines.append(f"{link} {x} {y}")
    return lines


def delete_vertex_by_link(name: str, link: str) -> ChangeSet:
    row = try_read(name, "select * from gis.link_vertices where link_id = %s", (link,))
    if row == None:
        return ChangeSet()
    return ChangeSet(g_delete_prefix | {'type': 'vertex', 'link' : link})