This is  pretty simple song in terms of structure, there's at least 4 riffs in this (intro riff, groovy riff, 
straight verse riff, outro riff) that are pretty much the same riff with slight variations in timing, style, 
speed and which octave they're played on.
It isn't necessary to tune ADAD, you could play this on an ADGC (A standard) tuning, but shift the intro 
riffs up two frets and just have the open note be slightly out, not as noticable than you might think.

[Intro]    
Intro Riff
                                                                        _____
D||-7------------------------------|-7---------------5----5----5-|           |
A||---6-0-5-0-6-0-0-6-5-0-3-0-5-0-0|---6-0-5-0-6-0-0----6----6---|           |
D||--------------------------------|-----------------------------|           |
A||--------------------------------|-----------------------------|           |
                                                                             | x3 (Just drums, then drums +
D||-7------------------------------|-7---------------5p0-5p0-5p0-5p0-|       |     bass, then drums, bass + 
A||---6-0-5-0-6-0-0-6-5-0-3-0-5-0-0|---6-0-5-0-6-0-0-----------------|       |     guitar for final 2)
D||--------------------------------|---------------------------------|       |
A||--------------------------------|---------------------------------|  _____|
Groovy Riff
D||--------|
A||--------|
D||--------|
A||-7/12\0-| Just a slide into the riff
D||--------------------------|---------------------|--------------------------|--------------------------|
A||--------------------------|---------------------|--------------------------|--------------------------|
D||-7------------------------|-7---------5---5---5-|-7------------------------|-7---------5p0-5p0-5p0-5p0| x2
A||---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---6---6--|---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---------------|
[Verse 1] Come in with Vocals
Straight Verse Riff
                                                       _____
D||----------------------|---------------------|            |
A||----------------------|---------------------|            |
D||-7--------------------|-7---------5---5---5-|            |
A||---6--5-6--5-6-5--3-5-|---6--5-6-----6---6--|            |
                                                            | x2
D||----------------------|---------------------------|      |
A||----------------------|---------------------------|      |
D||-7--------------------|-7---------5p0-5p0-5p0-5p0-|      |
A||---6--5-6--5-6-5--3-5-|---6--5-6------------------| _____|
Groovy Riff
D|||--------------------------|---------------------|--------------------------|--------------------------|
A||--------------------------|---------------------|--------------------------|--------------------------|
D||-7------------------------|-7---------5---5---5-|-7------------------------|-7---------5p0-5p0-5p0-5p0| x2
A||---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---6---6--|---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---------------|
D|-----|
A|-----|
D|-----|
A|-3~--| Ring out
[Chorus]
D||---------------------|---------------------|
A||---------------------|---------------------|
D||-----7~--5~--0~--3~--|---------5~----------|
A||-6~------------------|-6~--5~------3~--5~--|
[Post-Chorus]
Groovy Riff
D||--------------------------|---------------------|--------------------------|--------------------------|
A||--------------------------|---------------------|--------------------------|--------------------------|
D||-7------------------------|-7---------5---5---5-|-7------------------------|-7---------5p0-5p0-5p0-5p0| x2
A||---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---6---6--|---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---------------|
[Verse 2]
Straight Verse Riff
                                                       _____
D||----------------------|---------------------|            |
A||----------------------|---------------------|            |
D||-7--------------------|-7---------5---5---5-|            |
A||---6--5-6--5-6-5--3-5-|---6--5-6-----6---6--|            |
                                                            | x2
D||----------------------|---------------------------|      |
A||----------------------|---------------------------|      |
D||-7--------------------|-7---------5p0-5p0-5p0-5p0-|      |
A||---6--5-6--5-6-5--3-5-|---6--5-6------------------| _____|

[Chorus]
D||---------------------|---------------------|-----|
A||---------------------|---------------------|-----|
D||-----7~--5~--0~--3~--|-1~--0~--5~----------|-5~--| Ring out final note
A||-6~------------------|-------------3~--5~--|-----|

[Bridge]
CLICK CLICK CLICK CLICK
                                                                    _____
D||-7-------7~---------------|-6-------6~---------------|                |
A||---3-5-6----3-5-6-7-6-5-3-|---2-4-5----2-4-5-6-5-4-2-|                |
D||--------------------------|--------------------------|                |
A||--------------------------|--------------------------|                |
                                                                         | -- x4
D||-5-----5-----5-------------|-----------------------5---5-------|      |
A||---3-5---6~----6-5-3h5-2h3-|-2h3-3-3--3h5-5-5--5h6---6---6-5\3-|      |
D||---------------------------|-----------------------------------|      |
A||---------------------------|-----------------------------------| _____|
                                                                    
D||-------------------------------------------------------||
A||---------------------2h3-3-3--3h5-5-5--5h6-6-6-6-6-6-6-||
D||-7~--6~-----5--9--5------------------------------------||
A||---------6---------------------------------------------||
[Pre-Chorus]
Same as the Intro Riff
                                                                        _____
D||-7------------------------------|-7---------------5----5----5-|           |
A||---6-0-5-0-6-0-0-6-5-0-3-0-5-0-0|---6-0-5-0-6-0-0----6----6---|           |
D||--------------------------------|-----------------------------|           |
A||--------------------------------|-----------------------------|           |
                                                                             | x2 
D||-7------------------------------|-7---------------5p0-5p0-5p0-5p0-||      |       
A||---6-0-5-0-6-0-0-6-5-0-3-0-5-0-0|---6-0-5-0-6-0-0-----------------||      |      
D||--------------------------------|---------------------------------||      |
A||--------------------------------|---------------------------------|| _____|
Groovy Riff
D||--------------------------|---------------------|--------------------------|--------------------------|
A||--------------------------|---------------------|--------------------------|--------------------------|
D||-7------------------------|-7---------5---5---5-|-7------------------------|-7---------5p0-5p0-5p0-5p0| x2
A||---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---6---6--|---6p0-5-6\--0-6p5p0-3-5\-|---6p0-5-6\---------------|
Second time add repeat the 5p0 pull-offs an extra 2 times for a total of 12 pull-offs as below:
D||-----------------------------------------------------------||
A||-----------------------------------------------------------||
D||-7---------5p0-5p0-5p0-5p0-5p0-5p0-5p0-5p0-5p0-5p0-5p0-5p0-||
A||---6p0-5-6\------------------------------------------------||
[Chorus]
D||---------------------|---------------------|
A||---------------------|---------------------|
D||-----7~--5~--0~--3~--|-1~--0~--5~----------|
A||-6~------------------|-------------3~--5~--|
D||-----------------------|-----------------------|-----||
A||-----------------------|-----------------------|-----||
D||-----7~\--5~\--0~--3~--|-1~\--0~/--5~\---------|-5~--|| Ring out last note
A||-6~/-------------------|---------------3~--5~--|-----||
[Outro]
Same main notes as all other variations of this riff, but played at half-time with some slight nuances that 
are easily picked up by ear.
D||------------------------------------|-------------------------------|
A||------------------------------------|-------------------------------|
D||-7----------------------------------|-7-----------------5---5---5---|
A||----6--0--5--6~---0--6-5--0--3--5~--|----6--0--5--6~--0---6---6-----|
D||------------------------------------|--------------------------------|
A||------------------------------------|--------------------------------|
D||-7----------------------------------|-7-----------------5---5--------|
A||----6--0--5--6~---0--6-5--0--3--5~--|----6--0--5--6~--0---6---6--3-3-|
D||------------------------------------|--------------------------------|
A||------------------------------------|--------------------------------|
D||-7----------------------------------|-7-----------------5---5---5b---|
A||----6--0--5--6~---0--6-5--0--3--5~--|----6--0--5--6~--0---6---6------|
D||------------------------------------|--------------------------------------|
A||------------------------------------|--------------------------------------|
D||-7----------------------------------|-7------------------5---5---5---5-----|
A||----6--0--5--6~---0--6-5--0--3--5~--|----6--0--5--6~--0---6---6---6---6~---| Ring out last note

************************************
| p  Pull-off
| /  Slide up
| \  Slide down
| ~  Vibrato
| h  Hammer-on
| b  Bend

************************************