#!/usr/bin/env python3
# This script runs PrimeTime STA
# Rev 1 
# 6/10/2022

import argparse
import os

def run_sta_all (
    design: str,
    output_dir: str,
    log_dir: str
):
    proc_corners = ["t", "s", "f"]
    rc_corners = ["nom", "max", "min"]
    for proc in proc_corners:
        for rc in rc_corners:
            run_sta (design, proc, rc, output_dir, log_dir)

def run_sta (
    design: str,
    proc_corner: str,
    rc_corner: str,
    output_dir: str,
    log_dir: str
):
    print (f"PrimeTime STA run for design: {design} at process corner {proc_corner} and RC corner {rc_corner}")
    
    # Output directory structure 
    sub_dirs = ['reports', 'sdf', 'lib']
    for item in sub_dirs:
        path=os.path.join(output_dir,item)
        try:
            os.makedirs(os.path.join(path,rc_corner))
        except FileExistsError:
        # directory already exists
            pass


    # Enviornment Variables
    check_env_vars()
    os.environ["PDK_ROOT"] = os.getenv('PDK_ROOT')
    os.environ["PDK"] = os.getenv('PDK')
    os.environ["PT_LIB_ROOT"] = os.getenv('PT_LIB_ROOT')
    os.environ["CARAVEL_ROOT"] = os.getenv('CARAVEL_ROOT')
    os.environ["UPRJ_ROOT"] = os.getenv('UPRJ_ROOT')
    os.environ["MCW_ROOT"] = os.getenv('MCW_ROOT')
    os.environ["OUT_DIR"] = output_dir
    SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
    os.environ["DESIGN"] = design
    os.environ["PROC_CORNER"] = proc_corner
    os.environ["RC_CORNER"] = rc_corner

    # PrimeTime command
    PT_tcl = f"{SCRIPT_DIR}/pt_sta.tcl"
    pt_command = f"source /tools/bashrc_snps; pt_shell -f {PT_tcl} -output_log_file {log_dir}/{design}/{design}-{rc_corner}-{proc_corner}-sta.log"
    os.system(pt_command)
    # Check if there exists any violations
    sta_pass=search_viol(f"{output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-global.rpt")
    log = open(f"{log_dir}/{design}/{design}-{rc_corner}-{proc_corner}-sta.log", "a")
    if sta_pass == "pass":
        print (f"STA run Passed!")
        log.write(f"STA run Passed!")
    else:
        if sta_pass == "max_tran_cap":
            print (f"STA run Passed!")
            log.write(f"STA run Passed!\n")
            print (f"There are max_transition and max_capacitance violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
            log.write(f"There are max_transition and max_capacitance violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
        elif sta_pass == "max_tran":
            print (f"STA run Passed!")
            log.write(f"STA run Passed!\n")
            print (f"There are max_transition violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
            log.write(f"There are max_transition violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
        elif sta_pass == "max_cap":
            print (f"STA run Passed!")
            log.write(f"STA run Passed!\n")
            print (f"There are max_capacitance violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
            log.write(f"There are max_capacitance violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
        else:  
            print (f"STA run Failed!")
            log.write(f"STA run Failed!\n")
            if sta_pass == "setup":
                print(f"There are setup violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-global.rpt")
                log.write(f"There are setup violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-global.rpt")
            elif sta_pass == "hold":
                print(f"There are hold violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-global.rpt")
                log.write(f"There are hold violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-global.rpt")
            elif sta_pass == "viol":
                print(f"There are violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
                log.write(f"There are violations. check report: {output_dir}/reports/{rc_corner}/{design}.{proc_corner}{proc_corner}-all_viol.rpt")
            elif sta_pass== "no cons":
                print(f"Reading constraints SDC file failed. check log: {log_dir}/{design}/{design}-{rc_corner}-{proc_corner}-sta.log")
                log.write(f"Reading constraints SDC file failed. check log: {log_dir}/{design}/{design}-{rc_corner}-{proc_corner}-sta.log")
            else:
                print(f"Linking failed. check log: {log_dir}/{design}/{design}-{rc_corner}-{proc_corner}-sta.log")
                log.write(f"Linking failed. check log: {log_dir}/{design}/{design}-{rc_corner}-{proc_corner}-sta.log")
    log.close()

# Check the required env variables
def check_env_vars():
    pdk_root = os.getenv('PDK_ROOT')
    pdk = os.getenv('PDK')
    pt_lib_root = os.getenv('PT_LIB_ROOT')
    caravel_root = os.getenv('CARAVEL_ROOT')
    uprj_root = os.getenv('UPRJ_ROOT')
    mcw_root = os.getenv('MCW_ROOT')
    if pdk_root is None:
        raise FileNotFoundError(
        "Please export PDK_ROOT to the PDK path"
        )
    if pdk is None:
        raise FileNotFoundError(
        "Please export PDK to either sky130A or sky130B"
        )
    if pt_lib_root is None:
        raise FileNotFoundError(
        "Please export PT_LIB_ROOT to the PrimeTime liberties path"
        )
    if caravel_root is None:
        raise FileNotFoundError(
        "Please export CARAVEL_ROOT to the Caravel repo path"
        )
    if mcw_root is None:
        raise FileNotFoundError(
        "Please export MCW_ROOT to the Caravel Management SoC Litex repo path"
        )
    if uprj_root is None:
        raise FileNotFoundError(
        "Please export UPRJ_ROOT to the Caravel User Project Wrapper repo path"
        )

# Analyze the STA all violators output report
def search_viol(
    report_path: str
):
    with open(report_path, 'r') as report:
        data = report.read()
        if "Setup violations" in data:
            return "setup"
        elif "Hold violations" in data:
            return "hold"
        elif "Could not auto-link design" in data:
            return "no link"
    report_path = report_path.replace("global", "all_viol")
    with open(report_path, 'r') as report:
        data = report.read()
        if "max_transition" in data: 
            if "max_capacitance" in data:
                return "max_tran_cap"
            return "max_tran"
        elif "max_capacitance" in data:
            return "max_cap"
        elif "VIOLATED" in data:
            return "viol"
    report_path = report_path.replace("all_viol", "min_timing")
    with open(report_path, 'r') as report:
        data = report.read()
        if "No constrained paths" in data:
            return "no cons"
        else:
            return "pass"

if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description="Run STA using PrimeTime"
    )
    parser.add_argument(
        "-d",
        "--design",
        help="design name",
        required=True
    )
    parser.add_argument(
        "-o",
        "--output_dir",
        help="output directory",
        required=True
    )
    parser.add_argument(
        "-l",
        "--logs_dir",
        help="output directory",
        required=True
    )
    parser.add_argument(
        "-rc",
        "--rc_corner",
        help="Specify the RC corner for the parasitics (Values are nom, max, or min) <default is nom>",
        nargs="?",
        default="nom"
    )
    parser.add_argument(
        "-proc",
        "--proc_corner",
        help="Specify the process corner (Values are t, f, or s) <default is t>",
        nargs="?",
        default="t"
    )
    parser.add_argument(
        "-a",
        "--all",
        help="Specify to run all the process corners and rc corners combinations for the design",
        action='store_true'
    )

    args = parser.parse_args()

    output = os.path.abspath(os.path.join(args.output_dir,"primetime-signoff"))
    log = os.path.abspath(args.logs_dir)

    try:
        os.makedirs(output)
    except FileExistsError:
        # directory already exists
        pass

    try:
        os.makedirs(log)
    except FileExistsError:
        # directory already exists
        pass

    try:
        os.makedirs(os.path.join(log,args.design))
    except FileExistsError:
        # directory already exists
        pass

    sub_dirs = ['reports', 'sdf', 'lib']
    for item in sub_dirs:
        try:
            os.makedirs(os.path.join(output,item))
        except FileExistsError:
            # directory already exists
            pass

    if args.all:
        run_sta_all (args.design, output, log) 
    else:
        run_sta (args.design, args.proc_corner, args.rc_corner, output, log)