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#!/usr/bin/env tclsh
# $Id$

set KOAKUMA_VERSION "1.00"
set components ""

proc exiting {code} {
        exit $code
}

proc loop_components {run} {
        global components
        foreach {name description version} $components {
                eval $run
        }
}

proc crash {reason} {
        global components KOAKUMA_VERSION
        puts stderr "----- Start Koakuma Crash dump log -----"
        puts stderr "Included components:"
        loop_components {
                puts stderr "   $name: $description, version $version"
        }
        puts stderr "Reason: $reason"
        puts stderr "----- End Koakuma Crash dump log -----"
        puts    "Content-Type: text/html"
        puts    "Status: 500 Internal Server Error"
        puts    ""
        puts    "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">"
        puts    "<html>"
        puts    "       <head>"
        puts    "               <meta http-equiv=\"Content-Type\" content=\"text/html;charset=UTF-8\">"
        puts    "               <title>Oops</title>"
        puts    "       </head>"
        puts    "       <body>"
        puts    "               <h1>Oops</h1>"
        puts    "               <hr>"
        puts    "               Koakuma version $KOAKUMA_VERSION crashed, reason: <code>$reason</code><br>"
        puts    "               See the server error log for details."
        puts    "       </body>"
        puts    "</html>"
        exiting 1
}

if { ![info exists env(PATH_INFO)] } {
        puts "Status: 301 Moved Permanently"
        puts "Location: $env(SCRIPT_NAME)/"
        puts ""
        exiting 0
}

if { [catch {
        package require tdom
        dom createNodeCmd -tagName "rpc" elementNode rootXML
        dom createNodeCmd -tagName "version" -jsonType NONE elementNode keyVersion
        dom createNodeCmd -jsonType STRING textNode valueString
}] } {
        crash "Failed to load tDOM"
}

if { [catch {
        foreach path [glob @@PREFIX@@/lib/koakuma/component/*.tcl] {
                source "$path"
        }
}] } {
        crash "Could not load components"
}

set toc ""
set result ""
set content ""

proc rputs {data} {
        global result
        if { "$result" == "" } {
                set result "$data"
        } else {
                set result "$result\n$data"
        }
}

proc tputs {data} {
        global content
        if { "$content" == "" } {
                set content "$data"
        } else {
                set content "$content\n$data"
        }
}

proc html_escape {data} {
        return "[regsub -all {&} "[regsub -all {>} "[regsub -all {<} "$data" "&lt;"]" "&gt;"]" "&amp;"]"
}

proc open_projects {} {
        while 1 {
                if { ![info exists "@@PREFIX@@/lib/koakuma/db/projects.lock"] } {
                        break
                }
                set fid [open "@@PREFIX@@/lib/koakuma/db/projects.lock" "w"]
                if { ![info exists "/proc/[gets $fid line]"] } {
                        close $fid
                        break
                }
                after 10
                close $fid
        }
        set fid [open "@@PREFIX@@/lib/koakuma/db/projects.lock" "w"]
        puts $fid "[pid]"
        close $fid
}

proc scan_projects {run} {
        set fid [open "@@PREFIX@@/lib/koakuma/db/projects.db" "r"]
        set content ""
        while { [gets $fid line] >= 0 } {
                if { "$content" == "" } {
                        set content "$line"
                } else {
                        set content "$content\n$line"
                }
        }
        close $fid
        set dom [dom parse "$content"]
        set doc [$dom documentElement]
        foreach elem [$doc selectNodes "/projects/project"] {
                set name "[$elem selectNodes "string(name)"]"
                set description "[$elem selectNodes "string(description)"]"
                eval $run
        }
}

proc project_exists {projname} {
        set desc ""
        scan_projects {
                upvar 1 desc desc
                upvar 1 projname projname
                if { "$name" == "$projname" } {
                        set desc "$description"
                        break
                }
        }
        return "$desc"
}

proc close_projects {} {
        file delete "@@PREFIX@@/lib/koakuma/db/projects.lock"
}

proc start_html {title has_toc} {
        global toc
        rputs   "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">"
        rputs   "<html>"
        rputs   "       <head>"
        rputs   "               <meta http-equiv=\"Content-Type\" content=\"text/html;charset=UTF-8\">"
        rputs   "               <title>$title - Koakuma</title>"
        rputs   "               <link rel=\"stylesheet\" href=\"/static/style.css\">"
        rputs   "       </head>"
        rputs   "       <body>"
        rputs   "               <a href=\"/koakuma\" id=\"gomain\">"
        rputs   "                       <img src=\"/static/koakuma.png\" alt=\"Koakuma by Kasuya Baian\" height=\"192px\">"
        rputs   "               </a>"
        rputs   "               <div id=\"space\"></div>"
        rputs   "               <div id=\"title\">"
        rputs   "                       Koakuma"
        rputs   "               </div>"
        rputs   "               <div id=\"clearfix\"></div>"
        if { "$has_toc" == "1" } {
                rputs   "               <div id=\"toc\">"
                rputs   "                       <div id=\"toctitle\">TOC</div>"
                foreach sect $toc {
                        if { "[string range "[regsub -all { } "$sect" "-"]" 0 0]" == "-" } {
                                rputs "<a class=\"shiftlink\" href=\"#TOC-[regsub {^-} "[regsub -all { } "$sect" "-"]" ""]\">[regsub {^-} "$sect" ""]</a><br>"
                        } else {
                                rputs "<a href=\"#TOC-[regsub -all { } "$sect" "-"]\">$sect</a><br>"
                        }
                }
                rputs   "               </div>"
        }
        if { "$has_toc" == "1" } {
                rputs   "               <div id=\"doc\">"
        } else {
                rputs   "               <div id=\"doc-notoc\">"
        }
        rputs   "                       <h1>$title</h1>"
}
proc end_html {has_toc} {
        global KOAKUMA_VERSION
        rputs   "               </div>"
        rputs   "               <hr>"
        rputs   "               <i>Powered by <a href=\"http://nishi.boats/koakuma\">Koakuma</a> $KOAKUMA_VERSION</i>"
        rputs   "       </body>"
        rputs   "</html>"
}

proc add_toc {data} {
        global toc
        tputs   "<h2 id=\"TOC-[regsub -all { } "$data" "-"]\"><a href=\"#TOC-[regsub -all { } "$data" "-"]\">#</a> $data</h2>"
        lappend toc "$data"
}

proc add_toc2 {data} {
        global toc
        tputs   "<h3 id=\"TOC-[regsub -all { } "$data" "-"]\"><a href=\"#TOC-[regsub -all { } "$data" "-"]\">#</a> $data</h3>"
        lappend toc "-$data"
}

if { [catch {
        set path "[regsub -all {/+} "$env(PATH_INFO)" "/"]"
        if { [regexp {^/rpc(/.*)?$} "$path"] } {
                rputs "Content-Type: application/json"
        } else {
                rputs "Content-Type: text/html"
        }
        if { "$path" == "/" } {
                add_toc "Tcl Information"
                tputs   "<table border=\"0\">"
                tputs   "       <tr>"
                tputs   "               <th>"
                tputs   "                       Version"
                tputs   "               </th>"
                tputs   "               <td>"
                tputs   "                       $tcl_version"
                tputs   "               </td>"
                tputs   "       </tr>"
                tputs   "       <tr>"
                tputs   "               <th>"
                tputs   "                       Platform"
                tputs   "               </th>"
                tputs   "               <td>"
                tputs   "                       $tcl_platform(os)/$tcl_platform(machine) $tcl_platform(osVersion)"
                tputs   "               </td>"
                tputs   "       </tr>"
                tputs   "</table>"
                add_toc "Components"
                loop_components {
                        if { [llength [info procs "${name}_info"]] > 0 } {
                                ${name}_info
                        }
                }
                set has_projects 0
                add_toc "Projects"
                open_projects
                scan_projects {
                        upvar 1 has_projects has_projects
                        if { "$has_projects" == "0" } {
                                set has_projects 1
                                tputs   "<table border=\"0\">"
                        }
                        tputs   "<tr>"
                        tputs   "       <th><a href=\"/koakuma/project/$name\">$name</a></th>"
                        tputs   "       <td>$description</td>"
                        tputs   "</tr>"
                }
                close_projects
                if { "$has_projects" == "1" } {
                        tputs   "</table>"
                } else {
                        tputs   "No projects have been added, yet."
                }

                rputs ""
                start_html "Main" 1
                rputs "$content"
                end_html 1
        } elseif { [regexp {^/rpc(/.*)?$} "$path"] } {
                rputs ""
                regexp {^/rpc(/.*)?$} "$path" -> api
                set doc [dom createDocumentNode]
                set root $doc
                if { "$api" == "" || "$api" == "/" } {
                        $root appendFromScript {
                                keyVersion {valueString "$KOAKUMA_VERSION"}
                        }
                        rputs "[$doc asJSON]"
                }
        } elseif { [regexp {^/project/[^/]+.*$} "$path"] } {
                regexp {^/project/([^/]+).*$} "$path" -> projname
                open_projects
                set has_project [project_exists "$projname"]
                close_projects
                
                if { "$has_project" != "" } {
                        add_toc "Description"
                        tputs "[html_escape "$has_project"]"

                        rputs ""
                        start_html "Project: $projname" 1
                        rputs "$content"
                        end_html 1
                } else {
                        tputs "I could not find the project you were finding."

                        rputs "Status: 404 Not Found"
                        rputs ""
                        start_html "Not Found" 0
                        rputs "$content"
                        end_html 0
                }
        } else {
                tputs "I could not find the content you were finding."

                rputs "Status: 404 Not Found"
                rputs ""
                start_html "Not Found" 0
                rputs "$content"
                end_html 0
        }
}] } {
        crash "Could not render the HTML"
} else {
        puts "$result"
}
exiting 0