/******************************************************************************
 *
 * Project:  WMS Client Driver
 * Purpose:  Implementation of Dataset and RasterBand classes for WMS
 *           and other similar services.
 * Author:   Adam Nowacki, nowak@xpam.de
 *
 ******************************************************************************
 * Copyright (c) 2007, Adam Nowacki
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "stdinc.h"

GDALWMSDataset::GDALWMSDataset() {
    m_mini_driver = 0;
    m_cache = 0;
    m_hint.m_valid = false;
    m_data_type = GDT_Byte;
}

GDALWMSDataset::~GDALWMSDataset() {
    if (m_mini_driver) delete m_mini_driver;
    if (m_cache) delete m_cache;
}
CPLErr GDALWMSDataset::Initialize(CPLXMLNode *config) {
    CPLErr ret = CE_None;

    if (ret == CE_None) {
        const char *max_conn = CPLGetXMLValue(config, "MaxConnections", "");
        if (max_conn[0] != '\0') {
            m_http_max_conn = atoi(max_conn);
        } else {
            m_http_max_conn = 2;
        }
    }
    if (ret == CE_None) {
        const char *offline_mode = CPLGetXMLValue(config, "OfflineMode", "");
        if (offline_mode[0] != '\0') {
            const int offline_mode_bool = StrToBool(offline_mode);
            if (offline_mode_bool == -1) {
                CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Invalid value in OfflineMode, true / false expected.");
                ret = CE_Failure;
            } else {
                m_offline_mode = offline_mode_bool;
            }
        } else {
            m_offline_mode = 0;
        }
    }
    if (ret == CE_None) {
        const char *advise_read = CPLGetXMLValue(config, "AdviseRead", "");
        if (advise_read[0] != '\0') {
            const int advise_read_bool = StrToBool(advise_read);
            if (advise_read_bool == -1) {
                CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Invalid value in AdviseRead, true / false expected.");
                ret = CE_Failure;
            } else {
                m_use_advise_read = advise_read_bool;
            }
        } else {
            m_use_advise_read = 0;
        }
    }
    if (ret == CE_None) {
        const char *verify_advise_read = CPLGetXMLValue(config, "VerifyAdviseRead", "");
        if (m_use_advise_read) {
            if (verify_advise_read[0] != '\0') {
                const int verify_advise_read_bool = StrToBool(verify_advise_read);
                if (verify_advise_read_bool == -1) {
                    CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Invalid value in VerifyAdviseRead, true / false expected.");
                    ret = CE_Failure;
                } else {
                    m_verify_advise_read = verify_advise_read_bool;
                }
            } else {
                m_verify_advise_read = 1;
            }
        }
    }
    if (ret == CE_None) {
        const char *block_size_x = CPLGetXMLValue(config, "BlockSizeX", "1024");
        const char *block_size_y = CPLGetXMLValue(config, "BlockSizeY", "1024");
        m_block_size_x = atoi(block_size_x);
        m_block_size_y = atoi(block_size_y);
    }
    if (ret == CE_None) {
        CPLXMLNode *data_window_node = CPLGetXMLNode(config, "DataWindow");
        if (data_window_node == NULL) {
            CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: DataWindow missing.");
            ret = CE_Failure;
        } else {
            const char *overview_count = CPLGetXMLValue(config, "OverviewCount", "");
            const char *ulx = CPLGetXMLValue(data_window_node, "UpperLeftX", "-180.0");
            const char *uly = CPLGetXMLValue(data_window_node, "UpperLeftY", "90.0");
            const char *lrx = CPLGetXMLValue(data_window_node, "LowerRightX", "180.0");
            const char *lry = CPLGetXMLValue(data_window_node, "LowerRightY", "-90.0");
            const char *sx = CPLGetXMLValue(data_window_node, "SizeX", "");
            const char *sy = CPLGetXMLValue(data_window_node, "SizeY", "");
            const char *tx = CPLGetXMLValue(data_window_node, "TileX", "0");
            const char *ty = CPLGetXMLValue(data_window_node, "TileY", "0");
            const char *tlevel = CPLGetXMLValue(data_window_node, "TileLevel", "");
            const char *str_tile_count_x = CPLGetXMLValue(data_window_node, "TileCountX", "1");
            const char *str_tile_count_y = CPLGetXMLValue(data_window_node, "TileCountY", "1");

            if (ret == CE_None) {
                if ((ulx[0] != '\0') && (uly[0] != '\0') && (lrx[0] != '\0') && (lry[0] != '\0')) {
                    m_data_window.m_x0 = atof(ulx);
                    m_data_window.m_y0 = atof(uly);
                    m_data_window.m_x1 = atof(lrx);
                    m_data_window.m_y1 = atof(lry);
                } else {
                    CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Mandatory elements of DataWindow missing: UpperLeftX, UpperLeftY, LowerRightX, LowerRightY.");
                    ret = CE_Failure;
                }
            }
            if (ret == CE_None) {
                if (tlevel[0] != '\0') {
                    m_data_window.m_tlevel = atoi(tlevel);
                } else {
                    m_data_window.m_tlevel = 0;
                }
            }
            if (ret == CE_None) {
                if ((sx[0] != '\0') && (sy[0] != '\0')) {
                    m_data_window.m_sx = atoi(sx);
                    m_data_window.m_sy = atoi(sy);
                } else if ((tlevel[0] != '\0') && (str_tile_count_x[0] != '\0') && (str_tile_count_y[0] != '\0')) {
                    int tile_count_x = atoi(str_tile_count_x);
                    int tile_count_y = atoi(str_tile_count_y);
                    m_data_window.m_sx = tile_count_x * m_block_size_x * (1 << m_data_window.m_tlevel);
                    m_data_window.m_sy = tile_count_y * m_block_size_y * (1 << m_data_window.m_tlevel);
                } else {
                    CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Mandatory elements of DataWindow missing: SizeX, SizeY.");
                    ret = CE_Failure;
                }
            }
            if (ret == CE_None) {
                if ((tx[0] != '\0') && (ty[0] != '\0')) {
                    m_data_window.m_tx = atoi(tx);
                    m_data_window.m_ty = atoi(ty);
                } else {
                    CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Mandatory elements of DataWindow missing: TileX, TileY.");
                    ret = CE_Failure;
                }
            }
            if (ret == CE_None) {
                if (overview_count[0] != '\0') {
                    m_overview_count = atoi(overview_count);
                } else if (tlevel[0] != '\0') {
                    m_overview_count = m_data_window.m_tlevel;
                } else {
                    const int min_overview_size = MAX(32, MIN(m_block_size_x, m_block_size_y));
                    double a = log(static_cast<double>(MIN(m_data_window.m_sx, m_data_window.m_sy))) / log(2.0) 
                                - log(static_cast<double>(min_overview_size)) / log(2.0);
                    m_overview_count = MAX(0, MIN(static_cast<int>(ceil(a)), 32));
                }
            }
        }
    }
    if (ret == CE_None) {
        const char *proj = CPLGetXMLValue(config, "Projection", "");
        if (proj[0] != '\0') {
            m_projection = ProjToWKT(proj);
            if (m_projection.size() == 0) {
                CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Bad projection specified.");
                ret = CE_Failure;
            }
        }
    }
    if (ret == CE_None) {
        const char *bands_count = CPLGetXMLValue(config, "BandsCount", "3");
        m_bands_count = atoi(bands_count);
    }
    if (ret == CE_None) {
        CPLXMLNode *cache_node = CPLGetXMLNode(config, "Cache");
        if (cache_node != NULL) {
            m_cache = new GDALWMSCache();
            if (m_cache->Initialize(cache_node) != CE_None) {
                delete m_cache;
                m_cache = NULL;
                CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Failed to initialize cache.");
                ret = CE_Failure;
            }
        }
    }
    if (ret == CE_None) {
        CPLXMLNode *service_node = CPLGetXMLNode(config, "Service");
        if (service_node != NULL) {
            const char *service_name = CPLGetXMLValue(service_node, "name", "");
            if (service_name[0] != '\0') {
                GDALWMSMiniDriverManager *const mdm = GetGDALWMSMiniDriverManager();
                GDALWMSMiniDriverFactory *const mdf = mdm->Find(CPLString(service_name));
                if (mdf != NULL) {
                    m_mini_driver = mdf->New();
                    m_mini_driver->m_parent_dataset = this;
                    if (m_mini_driver->Initialize(service_node) == CE_None) {
                        m_mini_driver_caps.m_capabilities_version = -1;
                        m_mini_driver->GetCapabilities(&m_mini_driver_caps);
                        if (m_mini_driver_caps.m_capabilities_version == -1) {
                            CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Internal error, mini-driver capabilities version not set.");
                            ret = CE_Failure;
                        }
                    } else {
                        delete m_mini_driver;
                        m_mini_driver = NULL;

                        CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Failed to initialize minidriver.");
                        ret = CE_Failure;
                    }
                } else {
                    CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: No mini-driver registered for '%s'.", service_name);
                    ret = CE_Failure;
                }
            } else {
                CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: No Service specified.");
                ret = CE_Failure;
            }
        } else {
            CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: No Service specified.");
            ret = CE_Failure;
        }
    }
    if (ret == CE_None) {
        nRasterXSize = m_data_window.m_sx;
        nRasterYSize = m_data_window.m_sy;
        for (int i = 0; i < m_bands_count; ++i) {
            GDALWMSRasterBand *band = new GDALWMSRasterBand(this, i, 1.0);
            SetBand(i + 1, band);
            double scale = 0.5;
            for (int j = 0; j < m_overview_count; ++j) {
                band->AddOverview(scale);
                scale *= 0.5;
            }
        }
    }

    if (ret == CE_None) {
        /* If we dont have projection already set ask mini-driver. */
        if (!m_projection.size()) {
            const char *proj = m_mini_driver->GetProjectionInWKT();
            if (proj != NULL) {
                m_projection = proj;
            }
        }
    }

    return ret;
}

CPLErr GDALWMSDataset::IRasterIO(GDALRWFlag rw, int x0, int y0, int sx, int sy, void *buffer, int bsx, int bsy, GDALDataType bdt, int band_count, int *band_map, int pixel_space, int line_space, int band_space) {
    CPLErr ret;

    if (rw != GF_Read) return CE_Failure;
    if (buffer == NULL) return CE_Failure;
    if ((sx == 0) || (sy == 0) || (bsx == 0) || (bsy == 0) || (band_count == 0)) return CE_None;

    m_hint.m_x0 = x0;
    m_hint.m_y0 = y0;
    m_hint.m_sx = sx;
    m_hint.m_sy = sy;
    m_hint.m_overview = -1;
    m_hint.m_valid = true;
    //	printf("[%p] GDALWMSDataset::IRasterIO(x0: %d, y0: %d, sx: %d, sy: %d, bsx: %d, bsy: %d, band_count: %d, band_map: %p)\n", this, x0, y0, sx, sy, bsx, bsy, band_count, band_map);
    ret = GDALDataset::IRasterIO(rw, x0, y0, sx, sy, buffer, bsx, bsy, bdt, band_count, band_map, pixel_space, line_space, band_space);
    m_hint.m_valid = false;

    return ret;
}

const char *GDALWMSDataset::GetProjectionRef() {
    return m_projection.c_str();
}

CPLErr GDALWMSDataset::SetProjection(const char *proj) {
    return CE_Failure;
}

CPLErr GDALWMSDataset::GetGeoTransform(double *gt) {
    gt[0] = m_data_window.m_x0;
    gt[1] = (m_data_window.m_x1 - m_data_window.m_x0) / static_cast<double>(m_data_window.m_sx);
    gt[2] = 0.0;
    gt[3] = m_data_window.m_y0;
    gt[4] = 0.0;
    gt[5] = (m_data_window.m_y1 - m_data_window.m_y0) / static_cast<double>(m_data_window.m_sy);
    return CE_None;
}

CPLErr GDALWMSDataset::SetGeoTransform(double *gt) {
    return CE_Failure;
}

const GDALWMSDataWindow *GDALWMSDataset::WMSGetDataWindow() const {
    return &m_data_window;
}

const int GDALWMSDataset::WMSGetBlockSizeX() const {
    return m_block_size_x;
}

const int GDALWMSDataset::WMSGetBlockSizeY() const {
    return m_block_size_y;
}

CPLErr GDALWMSDataset::AdviseRead(int x0, int y0, int sx, int sy, int bsx, int bsy, GDALDataType bdt, int band_count, int *band_map, char **options) {
//    printf("AdviseRead(%d, %d, %d, %d)\n", x0, y0, sx, sy);
    if (m_offline_mode || !m_use_advise_read) return CE_None;
    if (m_cache == NULL) return CE_Failure;

    GDALRasterBand *band = GetRasterBand(1);
    if (band == NULL) return CE_Failure;
    return band->AdviseRead(x0, y0, sx, sy, bsx, bsy, bdt, options);
}
